A flat plate ceramic membrane water purification device based on gravity driving

Abstract

This invention discloses a gravity-driven flat-plate ceramic membrane water purification device, belonging to the field of water purification equipment technology. It includes a membrane module housing, inside which a ceramic flat-plate membrane module and a ceramic membrane water collection and guiding component are arranged. A backwashing component and a sewage discharge component are arranged on one side of the membrane module housing. The ceramic flat-plate membrane module includes several ceramic flat-plate membrane elements inserted and installed inside the membrane module housing, and these elements are vertically and evenly arranged on the inner wall of the membrane module housing. This invention, by setting up a ceramic flat-plate membrane module with multiple sets of hollow ceramic membrane elements vertically and equidistantly installed, uses the two sides of the membrane as the raw water filtration surface and the internal hollow cavity as the product water flow channel. After the filter tank is open and filled with water, gravity driving force is formed by the hydrostatic pressure of the liquid level. Under the action of its own weight pressure difference, the raw water permeates from the outer surface of the membrane into the inner cavity. The product water is collected through the bottom branch pipe and discharged by gravity, eliminating the need for a suction pump and reducing operating power consumption.

Description

Technical Field

[0001] This invention relates to the field of water purification equipment technology, specifically to a gravity-driven flat ceramic membrane water purification device. Background Technology

[0002] Currently, in the drinking water treatment industry, the mainstream upgrade solution is to transform traditional filter beds in situ into submerged ceramic flat sheet membrane ultrafiltration beds and produce water through negative pressure suction.

[0003] However, the entire system requires supporting power equipment such as vacuum pumps, negative pressure pipelines, and automatic suction units. It relies on negative pressure suction to drive water through the ceramic membrane to complete filtration, which has several shortcomings: First, the negative pressure equipment operates continuously year-round, resulting in high energy consumption and a large workload for maintenance; Second, during the operation of the ceramic membrane, water impurities easily adhere to the membrane surface to form a filter cake layer, causing a continuous decline in membrane flux. At the same time, the detached sludge settles and accumulates at the bottom of the filter tank, lacking an automatic sludge discharge structure. The accumulated sludge is prone to float back to the membrane surface and adhere to the membrane again, requiring manual cleaning of the tank regularly, making operation and maintenance cumbersome.

[0004] Therefore, this invention proposes a gravity-driven flat-plate ceramic membrane water purification device. Summary of the Invention

[0005] The purpose of this invention is to provide a gravity-driven flat-plate ceramic membrane water purification device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a gravity-driven flat ceramic membrane water purification device, comprising a membrane module shell, wherein a ceramic flat membrane module and a ceramic membrane water collection and guiding component are disposed inside the membrane module shell, and a backwashing cleaning component and a sewage discharge component are disposed on one side of the membrane module shell. The ceramic flat sheet membrane module includes several ceramic flat sheet membrane elements inserted and installed inside the membrane module housing, and the several ceramic flat sheet membrane elements are vertically and evenly arranged on the inner wall of the membrane module housing. The ceramic membrane water collection and diversion assembly includes several product water connection pipes fixedly embedded on the left side of the membrane module housing. The position of the product water connection pipes corresponds to the ceramic flat sheet membrane elements, and the input end of the product water connection pipes extends into the purified water cavity inside the ceramic flat sheet membrane elements. The backwash cleaning assembly includes several backwash cleaning pipes fixedly embedded on the right side of the membrane module housing. A guide tube is fixedly connected to one end of the backwash cleaning pipes away from the membrane module housing. A linkage shaft is rotatably installed inside the guide tube, and several guide impellers are fixedly installed on the surface of the linkage shaft.

[0007] Preferably, a cleaning water input pipe is fixedly embedded at the front end of the guide tube, a cleaning switch valve is fixedly installed on the surface of the cleaning water input pipe, a limit support frame is fixedly connected to the inner wall of the guide tube, the linkage shaft is rotatably connected to the surface of the limit support frame through a bearing, the end of the linkage shaft away from the cleaning water input pipe extends to the outside of the guide tube and is fixedly connected to a drive rod, and a first linkage gear is fixedly connected to the surface of the drive rod.

[0008] Preferably, the sewage discharge assembly includes two limiting blocks fixedly connected to the side of the membrane assembly housing, a rotating crossbar rotatably connected between the two limiting blocks, the rotating crossbar being parallel to the linkage shaft, and a plurality of eccentric cams fixedly connected to the surface of the rotating crossbar, a driven synchronous pulley fixedly connected to one end of the rotating crossbar, a driving synchronous pulley fixedly connected to the end of the drive rod away from the linkage shaft, the position of the driving synchronous pulley corresponding to the driven synchronous pulley, and a synchronous belt assembled between the driving synchronous pulley and the driven synchronous pulley.

[0009] Preferably, the sewage discharge assembly further includes a strip-shaped sewage discharge hole opened on the top right side of the membrane module housing. The inner top wall of the strip-shaped sewage discharge hole is provided with a rectangular limiting hole. A sewage discharge baffle is slidably connected to the inner wall of the rectangular limiting hole. The size of the sewage discharge baffle matches the strip-shaped sewage discharge hole. Two fixing blocks are symmetrically fixedly connected to the right side of the sewage discharge baffle. An extension bracket is fixedly connected to the lower surface of each of the two fixing blocks. The end of each of the two extension brackets away from the fixing blocks extends to the bottom of the membrane module housing, and a movable push plate is fixedly connected to the bottom end of each of the two extension brackets.

[0010] Preferably, the movable push plate is located directly above the rotating crossbar, the eccentric cam overlaps with the lower surface of the movable push plate, and a wear-resistant coated pad is fixedly provided on the lower surface of the movable push plate.

[0011] Preferably, four supporting blocks are symmetrically distributed on the right side surface of the membrane module housing. Guide posts are fixedly connected to the upper surface of the supporting blocks. The positions of the guide posts correspond to the extension brackets. Two guide sliders are fixedly connected to the surface of the extension brackets. The upper surface of the guide sliders is provided with guide through holes that match the guide posts. The guide slider posts are slidably connected to the inner wall of the guide through holes.

[0012] Preferably, a return spring is sleeved on the surface of the guide post, the top end of the return spring is fixedly connected to the surface of the guide post, and the bottom end of the return spring is fixedly connected to the upper surface of the guide slider.

[0013] Preferably, a sewage collection box is fixedly connected to the right side of the membrane module housing. The position of the sewage collection box corresponds to the strip-shaped sewage outlet, and the sewage collection box is located below the strip-shaped sewage outlet. A drain pipe is fixedly embedded on the back of the sewage collection box, and a filter screen is fixedly connected to the input end of the drain pipe.

[0014] Preferably, the backwashing assembly further includes an aeration pipe fixedly connected to the bottom wall of the membrane module housing. The surface of the aeration pipe is evenly distributed with a plurality of aeration nozzles. An air guide cylinder is fixedly connected to the side of the membrane module housing. A fan blade is rotatably mounted on the inner wall of the air guide cylinder. One end of the fan blade's shaft extends to the outside of the air guide cylinder and is fixedly connected to a second linkage gear. The position of the second linkage gear corresponds to that of the first linkage gear, and the first linkage gear meshes with the second linkage gear. An air guide pipe is fixedly connected to the air outlet end of the air guide cylinder, and the end of the air guide pipe away from the air guide cylinder is fixedly connected to the air inlet end of the aeration pipe.

[0015] Preferably, the inner wall of the membrane module housing is fixedly connected with several sets of limiting blocks, each set of limiting blocks being positioned corresponding to a ceramic flat sheet membrane element. The ceramic flat sheet membrane element is inserted between two adjacent limiting blocks on the left and right sides. The input ends of several product water connection pipes are fixedly connected to input water pipes. A purified water discharge pipe is fixedly embedded on the back of the membrane module housing, and the purified water discharge pipe is close to the top of the membrane module housing.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This gravity-driven flat-plate ceramic membrane water purification device uses a ceramic flat-plate membrane assembly. Multiple sets of hollow ceramic membrane elements are installed vertically and equidistantly. The two sides of the membrane serve as the raw water filtration surface, while the internal hollow cavity is the product water flow channel. After the filter tank is open and filled with water, gravity driving force is generated by the hydrostatic pressure of the liquid level. The raw water permeates from the outer surface of the membrane into the inner cavity under the action of its own weight pressure difference. The product water is collected through the bottom branch pipe and discharged by gravity, eliminating the need for suction pumps and reducing operating power consumption. The vertical arrangement of the membrane allows pollutants on the membrane surface to slide down naturally under their own weight, making it less likely to accumulate and clump on the membrane surface. Compared with the horizontal flat structure, this naturally reduces the membrane fouling rate and maintains a stable product water flux for a long time under low-pressure gravity conditions. The entire device can directly replace the filter media of traditional sand filters in situ. The product water pipeline connects to the existing gravity outlet pipe of the filter tank without the need for large-scale modification of the tank and re-laying of pipes. The modification and construction costs are low and the device is highly adaptable to local conditions.

[0017] This gravity-driven flat-plate ceramic membrane water purification device utilizes a backwashing component. High-pressure backwash water enters the guide tube through the cleaning water input pipe and then flows backward through the backwashing pipe into the purification cavity inside the ceramic flat-plate membrane element. It penetrates the membrane wall from the inside out, forcefully peeling off suspended solids, colloids, sludge, and other pollutants attached to the outer surface of the membrane. This effectively alleviates membrane fouling, restores membrane flux, and ensures long-term stable water production under gravity-driven mode. It eliminates the need for shutdown for disassembly and cleaning, thus enhancing the device's continuous operation capability.

[0018] This gravity-driven flat-plate ceramic membrane water purification device, through the inclusion of a sludge discharge component, utilizes high-pressure backwash water flow to drive the guide impeller and linkage shaft to rotate. Through a first linkage gear, a second linkage gear, a synchronous pulley, and an eccentric cam mechanism, it simultaneously achieves two functions: first, it drives the fan blades inside the air guide cylinder to rotate and generate air, which is then aerated to the bottom of the membrane via the air guide pipe, aeration pipe, and aeration nozzles. This creates air-water turbulence inside the membrane module shell, suspending detached sludge and preventing secondary adhesion to the membrane surface; second, it drives the eccentric cam to push the movable push plate, extension bracket, and sludge discharge baffle up and down, intermittently opening the strip-shaped sludge discharge hole to discharge suspended pollutants with the water flow into the sludge collection box. This integrated backwashing, aeration, and sludge discharge mechanism effectively solves the problem of sludge accumulation and secondary pollution at the bottom of the tank. Attached Figure Description

[0019] Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is a schematic diagram of the rear view structure of the present invention; Figure 3 for Figure 2 Enlarged structural diagram at point A; Figure 4 for Figure 2 Enlarged structural diagram at point B; Figure 5 This is a top view of the structure of the present invention; Figure 6 for Figure 5 Enlarged structural diagram at point C; Figure 7 This is a schematic diagram of the side cross-sectional structure of the membrane module housing of the present invention; Figure 8 This is a side view of the structure of the present invention; Figure 9 This is a side sectional view of the guide tube structure of the present invention; Figure 10 This is a bottom view of the air guide tube structure of the present invention.

[0020] In the diagram: 1. Membrane module housing; 2. Ceramic flat sheet membrane module; 3. Ceramic membrane water collection and diversion module; 4. Backwashing module; 5. Sewage discharge module; 201. Ceramic flat sheet membrane element; 202. Water purification cavity; 203. Limiting block; 301. Water production connection pipe; 302. Water inlet pipe; 303. Clean water discharge pipe; 401. Backwash cleaning pipe; 402. Flow guide tube; 403. Linkage shaft; 404. Flow guide impeller; 405. Cleaning water input pipe; 406. Cleaning switch valve; 407. Limit support frame; 408. Drive rod; 409. First linkage gear; 410. Drive synchronous pulley; 411. Aeration pipe; 412. Aeration nozzle; 413. Air guide tube; 414. Producer fan blade; 415. Second linkage gear; 416. Air guide tube; 501. Rotating crossbar; 502. Eccentric cam; 503. Driven synchronous pulley; 504. Synchronous belt; 505. Strip-shaped drain hole; 506. Rectangular limiting hole; 507. Drain baffle; 508. Fixing block; 509. Extension bracket; 510. Movable push plate; 511. Support base block; 512. Guide column; 513. Guide slider; 514. Return spring; 515. Drain collection box; 516. Drain pipe; 517. Filter screen cover. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-10 The present invention provides a technical solution: a gravity-driven flat ceramic membrane water purification device, including a membrane module shell 1, wherein a ceramic flat membrane module 2 and a ceramic membrane water collection and guiding module 3 are disposed inside the membrane module shell 1, and a backwashing cleaning module 4 and a sewage discharge module 5 are disposed on one side of the membrane module shell 1.

[0023] The ceramic flat sheet membrane element 201 is fixed by the limiting block 203 and is arranged vertically inside the membrane module shell 1. The whole set of equipment relies on the gravity head formed by the liquid level in the membrane module shell 1 to achieve negative pressure-free gravity flow water production.

[0024] The inner cavity of the membrane module housing 1 is an open water storage space. Multiple sets of limiting blocks 203 are fixedly installed on the inner wall of the membrane module housing 1. Two limiting blocks 203 in the same set are opposite each other to form a slot. The ceramic flat sheet membrane element 201 is inserted and limited between adjacent limiting blocks 203. All ceramic flat sheet membrane elements 201 are arranged vertically and evenly along the width direction of the membrane module housing 1. The ceramic flat sheet membrane elements 201 are parallel to each other, and water passage gaps are reserved between the elements. The ceramic flat sheet membrane element 201 has a hollow plate structure. The hollow area inside the element forms a water purification cavity 202, and the outer walls on the left and right sides of the element are water-permeable filtration surfaces.

[0025] This vertical arrangement structure brings significant advantages. During the water purification operation, the water inside the membrane module shell 1 is driven by gravity due to the liquid level difference. The water penetrates the ceramic wall from the outside of the ceramic flat sheet membrane element 201 and enters the water purification cavity 202. It is collected and discharged by its own weight, eliminating the need for a negative pressure suction pump and vacuum pipeline, which greatly reduces equipment investment and daily operating energy consumption. After the vertical arrangement, the suspended impurities trapped on the membrane surface naturally slide down under gravity, making it less likely to adhere and clump on the membrane surface, effectively slowing down the membrane fouling rate and ensuring long-term stability of membrane flux under gravity-driven conditions.

[0026] A ceramic membrane water collection and diversion component 3 is fixedly embedded on the left side wall of the membrane module housing 1. The ceramic membrane water collection and diversion component 3 includes multiple product water connection pipes 301. The positions of the product water connection pipes 301 correspond one-to-one with the ceramic flat sheet membrane elements 201. The input end of a single product water connection pipe 301 extends into the purified water cavity 202 of the corresponding ceramic flat sheet membrane element 201, so as to achieve a closed connection between the purified water cavity 202 and the product water connection pipe 301. The output ends of all product water connection pipes 301 are connected to the input water pipe 302. A purified water discharge pipe 303 is embedded on the rear wall of the membrane module housing 1 near the top. After the product water is collected by the product water connection pipes 301, it flows by gravity and is finally transported to the outside through the purified water discharge pipe 303. The entire water collection and diversion structure can be directly connected to the gravity water production pipeline of the existing traditional filter. When the old filter of the water plant is renovated, there is no need to destroy the tank body on a large scale and re-lay pipelines, which effectively shortens the construction period, reduces the renovation cost, and adapts to the needs of in-situ upgrade and renovation of existing water plant filter.

[0027] A backwash cleaning assembly 4 is mounted on the right side of the membrane module housing 1. The backwash cleaning assembly 4 includes multiple backwash cleaning pipes 401. One end of the backwash cleaning pipe 401 passes through the side wall of the membrane module housing 1 and communicates with the clean water cavity 202. The ends of the backwash cleaning pipes 401 away from the membrane module housing 1 are uniformly connected to the guide tube 402. A cleaning water input pipe 405 is fixedly embedded at the front end of the guide tube 402. A cleaning switch valve 406 is mounted on the body of the cleaning water input pipe 405. The inner cavity of the guide tube 402 is rotatably mounted with a linkage shaft 403 through a limiting support frame 407 and a bearing. Multiple sets of guide impellers 404 are fixed axially along the shaft of the linkage shaft 403. The guide impellers 404 are completely placed inside the water passage cavity of the guide tube 402. One end of the linkage shaft 403 extends out of the guide tube 402 and is fixedly connected to a drive rod 408. The first linkage gear 409 and the drive synchronous wheel 410 are fixed to the shaft of the drive rod 408.

[0028] When starting the backwashing operation, open the cleaning switch valve 406. High-pressure cleaning water is introduced into the guide tube 402 through the cleaning water input pipe 405. The water flow impacts the guide impeller 404, causing the linkage shaft 403 to rotate as a whole. A portion of the high-pressure water flows in the reverse direction into the clean water cavity 202 through the backwash cleaning pipe 401. The water flows outward from the clean water cavity 202 and backwashes the inner wall of the ceramic flat sheet membrane element 201. The water flow penetrates the membrane and peels off the flocs and suspended solids attached to the outside of the membrane, realizing online backwashing of the membrane element. There is no need to disassemble the membrane for offline cleaning, which effectively restores the membrane permeability flux and ensures continuous and uninterrupted operation of the device.

[0029] The backwash cleaning component 4 is also equipped with an aeration structure. An air guide cylinder 413 is fixed to the side wall of the membrane module housing 1. A fan blade 414 is rotatably assembled inside the air guide cylinder 413. The rotation axis of the fan blade 414 extends outward and fixes a second linkage gear 415. The second linkage gear 415 meshes with the first linkage gear 409 for transmission. The air outlet of the air guide cylinder 413 is connected to the aeration pipe 411 through the air guide pipe 416. The aeration pipe 411 is fixedly laid on the inner bottom wall of the membrane module housing 1. Several aeration nozzles 412 are evenly distributed on the pipe body of the aeration pipe 411. During the rotation of the linkage shaft 403, the first linkage gear 409 synchronously drives the second linkage gear 415 and the fan blade 414 to rotate. The fan blade 414 generates compressed air, which is sent into the aeration pipe 411 through the air guide pipe 416 and sprayed upward through each aeration nozzle 412 to form an aeration airflow. The airflow disturbs the water at the bottom of the membrane module housing 1 to form turbulence, which suspends the sludge flocs that have been backwashed and settled at the bottom of the tank, preventing sludge from depositing and agglomerating and adhering to the membrane surface again, further optimizing the cleaning effect and extending the equipment operation cycle.

[0030] A sewage discharge component 5 is installed at a corresponding position on the side of the membrane module housing 1. Two sets of limit blocks are fixed to the outer wall of the membrane module housing 1. A rotating crossbar 501 is installed horizontally between the two limit blocks. The rotating crossbar 501 is arranged parallel to the axis of the linkage shaft 403. Multiple sets of eccentric cams 502 are fixed to the body of the rotating crossbar 501. A driven synchronous wheel 503 is fixed to the end of the rotating crossbar 501. A synchronous belt 504 is sleeved between the driven synchronous wheel 503 and the driving synchronous wheel 410 to achieve synchronous transmission.

[0031] A strip-shaped drain hole 505 is provided on the top right side of the membrane module housing 1. A rectangular limiting hole 506 is provided above the strip-shaped drain hole 505. A drain baffle 507 is vertically slidably installed inside the rectangular limiting hole 506. The external dimensions of the drain baffle 507 match those of the strip-shaped drain hole 505, which can block or open the drain channel. Two fixing blocks 508 are symmetrically fixed on the outer right side of the drain baffle 507. The lower ends of the fixing blocks 508 are respectively connected to extension brackets 509. The extension brackets 509 extend vertically downward to the bottom of the membrane module housing 1. The bottom ends of the two extension brackets 509 are connected to a movable push plate 510. The movable push plate 510 is horizontally arranged directly above the eccentric cam 502. A wear-resistant coating pad is laid on the lower surface of the movable push plate 510 to reduce the wear caused by the reciprocating push of the cam. Four support blocks 511 are fixed to the outside of the membrane module housing 1. Guide posts 512 are vertically fixed to the upper surface of the support blocks 511. Guide sliders 513 are fixed to the outer wall of the extension bracket 509. Guide sliders 513 have guide through holes adapted to the guide posts 512. The guide posts 512 are inserted into the guide through holes to form a vertical sliding pair. A return spring 514 is fitted on the outside of each guide post 512. The upper end of the return spring 514 is fixed to the top of the guide post 512, and the lower end is pressed against the upper surface of the guide slider 513.

[0032] A sewage collection box 515 is fixed on the outer wall of the membrane module housing 1 and directly below the strip-shaped sewage outlet 505. A drain pipe 516 is embedded on the back of the sewage collection box 515. A filter screen cover 517 is installed at the inlet of the drain pipe 516 to intercept large particles of impurities and prevent pipe blockage. In the backwash linkage operation, the drive synchronous wheel 410 drives the driven synchronous wheel 503 and the rotating crossbar 501 to rotate via the synchronous belt 504. The eccentric cam 502 moves in a circular motion with the rotating crossbar 501. The cam protrusion periodically pushes the movable push plate 510 upward. The movable push plate 510 drives the sewage discharge baffle 507 to rise upward through the extension bracket 509 and the fixed block 508, opening the strip sewage discharge hole 505. The wastewater carrying suspended sludge in the pool is discharged into the sewage collection box 515 and finally discharged through the drain pipe 516. After the eccentric cam 502 rotates and disengages from the movable push plate 510, the return spring 514 pulls the guide slider 513 and the extension bracket 509 to return downward. The sewage discharge baffle 507 falls back and re-closes the strip sewage discharge hole 505, realizing the intermittent automatic opening and closing of the sewage discharge hole. The entire sewage discharge mechanism is driven by the backwash water flow, without the need for additional motors, cylinders and other power components, saving investment in supporting equipment and power consumption.

[0033] Working Principle: The device operates in two modes: normal gravity-driven water production and backwashing / sewage discharge. During normal water purification, the membrane module housing 1 maintains a fixed water level. Under the influence of gravity pressure, raw water seeps into the vertically arranged ceramic flat-plate membrane element 201 from both outer surfaces, passes through the ceramic filter wall, and enters the purified water cavity 202. The filtered water is then collected via the product water connection pipe 301 and the input water pipe 302, and continuously discharged from the purified water outlet pipe 303 by gravity. The turbidity of the effluent is stably controlled below 0.1 NTU, effectively intercepting bacteria and viruses in the water and reducing the amount of disinfectant required at the downstream end.

[0034] When the device reaches the set cycle and requires cleaning and maintenance, the cleaning switch valve 406 is opened, and high-pressure cleaning water enters the guide tube 402 from the cleaning water inlet pipe 405. The high-speed water flow impacts the guide impeller 404, driving the linkage shaft 403 to rotate continuously. The high-pressure water acts in two ways: one way flows backward into the clean water cavity 202 through the backwash cleaning pipe 401, backwashing and stripping away contaminants from the membrane surface from the inside out, completing the hydraulic cleaning of the membrane element; the other way relies on the kinetic energy of the water flow to convert into mechanical power, driving the linkage shaft 403 through the first linkage gear 409. The second linkage gear 415 and the drive synchronous wheel 410 generate fan blades 414 to rotate and blow air. Compressed air is sent into aeration pipe 411 through air guide pipe 416. Aeration nozzle 412 sprays air to disturb the water at the bottom of the pool, suspending and dislodging sludge. The drive synchronous wheel 410 drives the rotating crossbar 501 and eccentric cam 502 to rotate via synchronous belt 504. It periodically pushes the movable push plate 510, causing the sewage discharge baffle 507 to rise and fall intermittently. It automatically opens the strip sewage discharge hole 505 to discharge the muddy wastewater, which then flows into the sewage collection box 515 and is discharged out through the drain pipe 516.

Claims

1. A gravity-driven flat-plate ceramic membrane water purification device, comprising a membrane module housing (1), characterized in that: The membrane module housing (1) is provided with a ceramic flat plate membrane module (2) and a ceramic membrane water collection and diversion module (3) inside, and a backwash cleaning module (4) and a sewage discharge module (5) are provided on one side of the membrane module housing (1). The ceramic flat sheet membrane module (2) includes several ceramic flat sheet membrane elements (201) inserted and installed inside the membrane module housing (1), and the several ceramic flat sheet membrane elements (201) are arranged vertically and evenly on the inner wall of the membrane module housing (1). The ceramic membrane water collection and diversion assembly (3) includes several water production connection pipes (301) fixedly embedded on the left side of the membrane module housing (1). The position of the water production connection pipes (301) corresponds to the ceramic flat sheet membrane elements (201), and the input end of the water production connection pipes (301) extends into the purified water cavity (202) inside the ceramic flat sheet membrane element (201). The backwash cleaning assembly (4) includes several backwash cleaning pipes (401) fixedly embedded on the right side of the membrane module housing (1). A guide tube (402) is fixedly connected to one end of the several backwash cleaning pipes (401) away from the membrane module housing (1). A linkage shaft (403) is rotatably arranged inside the guide tube (402). Several guide impellers (404) are fixedly arranged on the surface of the linkage shaft (403).

2. The gravity-driven flat-plate ceramic membrane water purification device according to claim 1, characterized in that: The front end of the guide tube (402) is fixedly embedded with a cleaning water input pipe (405), and a cleaning switch valve (406) is fixedly installed on the surface of the cleaning water input pipe (405). A limit support frame (407) is fixedly connected to the inner wall of the guide tube (402). The linkage shaft (403) is rotatably connected to the surface of the limit support frame (407) through a bearing. The end of the linkage shaft (403) away from the cleaning water input pipe (405) extends to the outside of the guide tube (402) and is fixedly connected with a drive rod (408). A first linkage gear (409) is fixedly connected to the surface of the drive rod (408).

3. The gravity-driven flat-plate ceramic membrane water purification device according to claim 2, characterized in that: The sewage discharge assembly (5) includes two limiting blocks fixedly connected to the side of the membrane assembly housing (1). A rotating crossbar (501) is rotatably connected between the two limiting blocks. The rotating crossbar (501) is parallel to the linkage shaft (403). Several eccentric cams (502) are fixedly connected to the surface of the rotating crossbar (501). A driven synchronous wheel (503) is fixedly connected to one end of the rotating crossbar (501). A driving synchronous wheel (410) is fixedly connected to the end of the drive rod (408) away from the linkage shaft (403). The position of the driving synchronous wheel (410) corresponds to that of the driven synchronous wheel (503). A synchronous belt (504) is assembled between the driving synchronous wheel (410) and the driven synchronous wheel (503).

4. The gravity-driven flat-plate ceramic membrane water purification device according to claim 3, characterized in that: The sewage discharge assembly (5) also includes a strip-shaped sewage discharge hole (505) opened on the top right side of the membrane module housing (1). The inner top wall of the strip-shaped sewage discharge hole (505) is provided with a rectangular limiting hole (506). The inner wall of the rectangular limiting hole (506) is slidably connected with a sewage discharge baffle (507). The size of the sewage discharge baffle (507) matches the size of the strip-shaped sewage discharge hole (505). Two fixing blocks (508) are symmetrically fixedly connected to the right side of the sewage discharge baffle (507). The lower surfaces of the two fixing blocks (508) are fixedly connected with extension brackets (509). One end of the two extension brackets (509) away from the fixing blocks (508) extends to the bottom of the membrane module housing (1), and the bottom end of the two extension brackets (509) is fixedly connected with a movable push plate (510).

5. A gravity-driven flat-plate ceramic membrane water purification device according to claim 4, characterized in that: The movable push plate (510) is located directly above the rotating crossbar (501), the eccentric cam (502) overlaps with the lower surface of the movable push plate (510), and a wear-resistant coating pad is fixedly provided on the lower surface of the movable push plate (510).

6. The gravity-driven flat-plate ceramic membrane water purification device according to claim 5, characterized in that: Four support blocks (511) are symmetrically distributed on the right side surface of the membrane module housing (1). A guide post (512) is fixedly connected to the upper surface of the support block (511). The position of the guide post (512) corresponds to the extension bracket (509). Two guide sliders (513) are fixedly connected to the surface of the extension bracket (509). The upper surface of the guide slider (513) is provided with a guide through hole that matches the guide post (512). The guide slider post (512) is slidably connected to the inner wall of the guide through hole.

7. A gravity-driven flat-plate ceramic membrane water purification device according to claim 6, characterized in that: A reset spring (514) is fitted on the surface of the guide post (512). The top end of the reset spring (514) is fixedly connected to the surface of the guide post (512), and the bottom end of the reset spring (514) is fixedly connected to the upper surface of the guide slider (513).

8. A gravity-driven flat-plate ceramic membrane water purification device according to claim 7, characterized in that: A sewage collection box (515) is fixedly connected to the right side of the membrane module housing (1). The position of the sewage collection box (515) corresponds to the strip-shaped sewage hole (505), and the sewage collection box (515) is located below the strip-shaped sewage hole (505). A drain pipe (516) is fixedly embedded on the back of the sewage collection box (515), and a filter screen cover (517) is fixedly connected to the input end of the drain pipe (516).

9. A gravity-driven flat-plate ceramic membrane water purification device according to claim 8, characterized in that: The backwash cleaning assembly (4) also includes an aeration pipe (411) fixedly connected to the bottom wall of the membrane assembly housing (1). The surface of the aeration pipe (411) is evenly distributed with a number of aeration nozzles (412). The side of the membrane assembly housing (1) is fixedly connected to an air guide cylinder (413). The inner wall of the air guide cylinder (413) is rotatably provided with a fan blade (414). One end of the rotating shaft of the fan blade (414) extends to the outside of the air guide cylinder (413) and is fixedly connected to a second linkage gear (415). The position of the second linkage gear (415) corresponds to the first linkage gear (409), and the first linkage gear (409) meshes with the second linkage gear (415). The air outlet end of the air guide cylinder (413) is fixedly connected to an air guide pipe (416). The end of the air guide pipe (416) away from the air guide cylinder (413) is fixedly connected to the air inlet end of the aeration pipe (411).

10. A gravity-driven flat-plate ceramic membrane water purification device according to claim 9, characterized in that: The inner wall of the membrane module housing (1) is fixedly connected with several sets of limiting blocks (203). The position of each set of limiting blocks (203) corresponds to a ceramic flat sheet membrane element (201). The ceramic flat sheet membrane element (201) is inserted between two adjacent limiting blocks (203). The input end of several product water connection pipes (301) is fixedly connected with an input water pipe (302). The back of the membrane module housing (1) is fixedly embedded with a purified water discharge pipe (303). The purified water discharge pipe (303) is close to the top of the membrane module housing (1).

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