Magnetic intermittent water supply and linkage aeration device for gravity-driven membrane system

Abstract

The application discloses a magnetic intermittent water supply and linkage aeration device for a gravity-driven membrane system, relates to the field of water treatment and fluid control, and solves the stability defect problem of an existing mechanical valve. The water storage tank is internally provided with a buoyancy driving structure and a water outlet valve structure. The water outlet valve structure comprises a transmission connecting rod structure, a valve rod and a reset element. The buoyancy driving structure, the transmission connecting rod structure and the valve rod are sequentially connected, and the middle part of the transmission connecting rod structure is hinged to the inner wall of the water storage tank. The other end of the valve rod is connected with the reset element through the water drainage channel. A pair of mutually attractive magnets are arranged between the transmission connecting rod structure and the inner wall of the water storage tank. A valve is arranged on the valve rod. The buoyancy driving structure drives the valve rod to move up and down through the transmission connecting rod structure, so that the water drainage channel is turned on and off. The application combines the buoyancy driving, magnetic attraction threshold and spring release mechanism, realizes intermittent transient water release of high potential energy, and provides sufficient power for flushing and aeration in the membrane tank.

Description

Technical Field

[0001] This invention relates to the field of water treatment and fluid control technology, specifically to a magnetic intermittent water supply and linkage aeration device for gravity-driven membrane systems. Background Technology

[0002] Gravity-driven membrane (GDM) ultrafiltration technology has great application potential in areas such as decentralized water supply in rural areas and emergency water purification in the field due to its advantages such as low operating pressure, no need for backwashing, and low maintenance costs. Studies have shown that the final stable flux of a GDM system is related to the structure and properties of the biofouling layer on the membrane surface. The greater the roughness of the biofouling layer, the more developed its internal pores, and the lower the content of microbial extracellular polymers (EPS), the higher the stable flux level. Under long-term continuous operation, the biofouling layer is easily compacted, forming a dense structure with low porosity, which leads to a sharp increase in the system's water permeability resistance, and the final stable flux is usually maintained at a very low level (4~10 LMH).

[0003] Introducing intermittent operation and aeration during GDM operation allows for the periodic release of hydrostatic pressure within the membrane tank, promoting reverse relaxation and expansion of the compacted biofilm layer and providing fluid shear stress. Simultaneously, aeration increases the dissolved oxygen concentration within the membrane tank, enhancing the biological activity of the biofilm layer and reducing its resistance, thereby significantly lowering filter cake resistance and increasing the system's final stable flux. Existing research indicates that intermittent operation can significantly increase the porosity of the filter cake layer from 62.99% during continuous operation to 73.07%, and the final stable flux jumps from 8.61 LMH to 13.28 LMH, representing a flux increase of over 50%.

[0004] To achieve intermittent water supply without electricity, existing technologies often employ mechanically triggered valves connected to a float and lever. However, traditional mechanical structures suffer from two major drawbacks in actual operation: First, they lack a reliable nonlinear trigger threshold, resulting in a slow valve opening process (gradual opening) that fails to accumulate sufficient gravitational potential energy to generate a large-flow transient jet, leading to poor Venturi aeration at the downstream end. Second, traditional hollow floats are susceptible to lateral drift due to liquid surface fluctuations, and the simple articulated linkage is prone to geometrical interference (jamming) during transmission, causing the valve to operate extremely unstablely in complex water-related environments, making it difficult to achieve the "near-zero maintenance" requirements for rural water supply. Furthermore, while existing magnetically controlled valves are used in level control, their magnetic force is typically only used to maintain or switch on / off states; no technical solution has yet been found that uses magnetic attraction as a "trigger threshold" in conjunction with a spring-loaded release mechanism to achieve intermittent pulse discharge.

[0005] Therefore, there is an urgent need for a purely mechanical triggering device that can stably provide large-flow pulsed intermittent water supply and simultaneously induce strong aeration without relying on electricity or complex control systems, and whose mechanical transmission is reliable over a long period of time. Summary of the Invention

[0006] To address the aforementioned stability issues of existing mechanical valves, this invention proposes a magnetically aspirated intermittent water supply and linkage aeration device for gravity-driven membrane systems. This invention combines buoyancy drive, magnetic threshold, and spring-release mechanism to achieve high-potential-energy intermittent transient water release, providing sufficient power for flushing and aeration within the membrane tank.

[0007] This invention proposes a magnetic intermittent water supply and linkage aeration device for a gravity-driven membrane system, specifically comprising a water storage tank, a buoyancy drive structure, an outlet valve structure, and a gravity-driven membrane system. The water storage tank is connected to the gravity-driven membrane system via a drainage channel. The water storage tank contains the buoyancy drive structure and the outlet valve structure. The outlet valve structure includes a transmission linkage structure, a valve stem, and a reset element. One end of the buoyancy drive structure is connected to the transmission linkage structure, the middle of the transmission linkage structure is hinged to the inner wall of the water storage tank, and the other end of the transmission linkage structure is hinged to one end of the valve stem. The other end of the valve stem passes through the drainage channel and connects to the reset element. A pair of mutually attracting magnets are placed between the transmission linkage structure and the inner wall of the water storage tank. A valve is installed on the valve stem. The buoyancy drive structure drives the valve stem to move up and down via the transmission linkage structure, thereby opening and closing the drainage channel.

[0008] Furthermore, the buoyancy drive structure includes a guide column and a float. The guide column is disposed in the water storage cavity, and the float is slidably disposed on the guide column. The float is connected to the transmission linkage structure.

[0009] Furthermore, the guide post is provided with a maximum stroke stop at its upper end and a minimum stroke stop at its lower end.

[0010] Furthermore, a float push rod is provided at the upper end of the float, and a sliding pin is provided at one end of the float push rod, which is slidably connected to the transmission linkage structure.

[0011] Furthermore, the transmission linkage structure includes a transmission lever, a connecting rod, and a first permanent magnet; one end of the transmission lever is slidably connected to the buoyancy drive structure, and the other end is hinged to one end of the connecting rod; the other end of the connecting rod is hinged to the valve stem; a pair of mutually attractive magnets are provided between the transmission lever and the inner wall of the water storage tank.

[0012] Furthermore, a pair of magnets that attract each other are provided between the end of the transmission lever that is hinged to the connecting rod and the inner wall of the working cavity.

[0013] Furthermore, the transmission lever is provided with a groove, and the groove is slidably connected to the buoyancy drive structure.

[0014] Furthermore, a fixed fulcrum is provided on the inner wall of the water storage tank, and the fixed fulcrum and the transmission lever are hinged in the middle.

[0015] Furthermore, the gravity-driven membrane system includes a venturi tube and a gravity-driven membrane system body, with the drainage channel, venturi tube, and gravity-driven membrane system body connected in sequence; an aeration port is provided on the venturi tube.

[0016] Furthermore, the reset element is a reset spring.

[0017] The beneficial effects of the magnetic intermittent water supply and linkage aeration device for gravity-driven membrane systems described in this invention are as follows: (1) The magnetic intermittent water supply and linkage aeration device for gravity-driven membrane systems described in this invention can generate strong linkage aeration and shear stress: through the coupling of the magnetic attraction threshold and the spring force, the valve can jump upward at the moment of triggering, and the drainage channel can be fully opened instantly, realizing high-energy-gap intermittent pulse water supply. Experimental verification shows that after installing this device, the stable flux of the GDM system increased from about 8.6 LMH during continuous operation to about 14.8 LMH, with a flux increase of more than 70%. The high-flow-rate water and air bubbles generated intermittently enter the gravity-driven membrane tank, providing a combination of intermittent filtration, membrane relaxation and fluid shear stress effects for the membrane surface.

[0018] (2) The magnetic intermittent water supply and linkage aeration device for gravity-driven membrane systems described in this invention significantly improves the final stable flux of GDM: the intermittent water supply and linkage aeration mechanism formed by the device causes periodic abrupt changes in the hydrostatic pressure in the membrane tank, effectively inducing the compacted dense filter cake layer to undergo reverse relaxation and expansion; at the same time, the linkage pulsed air-water mixing flow forms strong fluid shear stress on the membrane surface. This greatly reduces the filtration resistance of the biofilter cake layer, thereby significantly improving the stable flux of the system under no-electricity conditions.

[0019] (3) The magnetic intermittent water supply and linkage aeration device for gravity-driven membrane system described in this invention has stable and reliable transmission and achieves near-zero maintenance: the introduction of a central vertical guide column eliminates the lateral drift of the float; the linkage design of "sliding groove + sliding pin" absorbs the displacement difference between linear and circular motion, completely eliminating the lateral drift and mechanical jamming caused by the liquid surface fluctuation of traditional hollow floats, and greatly improving the long-term operational reliability of the device in environments lacking stable power and professional maintenance personnel.

[0020] (4) The magnetic intermittent water supply and linkage aeration device for gravity-driven membrane system described in this invention has a precisely adjustable trigger threshold: by adjusting the adsorption distance between the first permanent magnets, replacing permanent magnets with different magnetic forces, or adjusting the lever arm ratio of the transmission lever, the critical trigger water level can be precisely set to adapt to different water source conditions and process requirements. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0022] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of a magnetic intermittent water supply and linkage aeration device for a gravity-driven membrane system according to the present invention. Figure 2 This is a schematic diagram of the action state of a magnetic intermittent water supply and linkage aeration device for a gravity-driven membrane system as described in this invention at the moment when the critical water level is reached and the spring releases to open the valve. Wherein: 1-Water storage tank, 2-Guide column, 3-Float, 31-Float push rod, 32-Sliding pin, 4-Transmission lever, 41-Slide groove, 5-Fixed fulcrum, 6-First permanent magnet, 61-Magnet one, 62-Magnet two, 7-Valve stem, 8-Reset spring, 9-Connecting rod, 10-Valve, 11-Second permanent magnet, 111-Magnet three, 112-Magnet four, 12-Aeration port, 13-Venturi tube, 14-Gravity driven membrane system main body, 15-Water inlet. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. The described embodiments are merely some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] Specific implementation method one: See Figures 1-2 This embodiment is described in detail. The magnetic intermittent water supply and linkage aeration device for a gravity-driven membrane system described in this embodiment specifically includes a water storage tank 1, a buoyancy drive structure, an outlet valve structure, and a gravity-driven membrane system; the water storage tank 1 is connected to the gravity-driven membrane system through a drainage channel; the buoyancy drive structure and the outlet valve structure are located inside the water storage tank 1 and are interconnected.

[0025] The buoyancy drive structure includes a guide post 2 and a float 3. The float 3 is slidably mounted on the guide post 2 and is annular. The guide post 2 has a maximum stroke stop at its upper end and a minimum stroke stop at its lower end to limit the axial sliding boundary of the float 3 on the guide post 2. The float 3 has a float push rod 31 at its upper end, and a sliding pin 32 at one end of the float push rod 31. The sliding pin 32 is slidably connected to the outlet valve structure.

[0026] The outlet valve structure includes a transmission linkage structure, a valve stem 7, and a reset element. The transmission linkage structure includes a transmission lever 4, a connecting rod 9, a first permanent magnet 6, and a second permanent magnet 11. The transmission lever 4 has a V-shaped structure with a groove 41 at one end, and the sliding pin 32 at the end of the float push rod 31 is slidably disposed in the groove 41. The other end of the transmission lever 4 is hinged to one end of the connecting rod 9, and the tip of the middle part of the V-shaped structure is hinged to a fixed fulcrum 5 provided on the inner wall of the water storage tank 1. The other end of the connecting rod 9 is hinged to the valve stem 7. The reset element is located below the drainage channel. The other end of the valve stem 7 passes through the drainage channel and is connected to one end of the reset element. The other end of the reset element is connected to the bottom surface of the water storage tank 1. The reset element is used to provide an upward elastic restoring force for the valve stem 7. A valve 10 is provided on the valve stem 7. The buoyancy drive structure drives the valve stem 7 to move up and down through the transmission linkage structure to realize the opening and closing of the drainage channel. When the valve stem 7 moves upward, the valve 10 moves to the position of the drainage channel, and the drainage channel is opened. The reset element is a reset spring 8. The spring stiffness of the reset spring 8 is 5 to 50 N / mm, the pre-compression amount is 5 to 30 mm, and the maximum compression stroke is 10 to 50 mm, so that the valve stem 7 opens at a speed ≥ 0.5 m / s at the moment of triggering, thereby generating transient pulse discharge.

[0027] A first permanent magnet 6 is installed between the transmission lever 4 and the inner wall of the water tank 1. The first permanent magnet 6 includes a first magnet 61 and a second magnet 62. The first magnet 61 is installed on the transmission lever 4 and is located between the fixed fulcrum 5 and the connecting rod 9. The second magnet 62 is installed on the inner wall of the water tank 1. The magnetic attraction between the first magnet 61 and the second magnet 62 keeps the transmission lever 4 in a locked state. The adsorption distance between the first magnet 61 and the second magnet 62 is 1 to 10 mm. The critical trigger water level is set by adjusting this distance or replacing the permanent magnet with one of different magnetic forces. Taking the hinge position between the transmission lever 4 and the fixed fulcrum 5 as the dividing line, the end of the transmission lever 4 that is hinged to the float push rod 31 is the left lever arm, and the end of the transmission lever 4 that is hinged to the connecting rod 9 is the right lever arm. The lever arm ratio (left lever arm: right lever arm) of the transmission lever 4 is 1:0.5 to 1:2. The critical trigger water level is set by adjusting the lever arm ratio in conjunction with the magnetic attraction of the first permanent magnet 6.

[0028] A second permanent magnet 11 is provided between the end of the transmission lever 4 that is hinged to the connecting rod 9 and the inner wall of the outlet valve structure; the second permanent magnet 11 includes a third magnet 111 and a fourth magnet 112. The third magnet 111 is provided at the end of the transmission lever 4 that is hinged to the connecting rod 9, and the fourth magnet 112 is provided on the inner wall of the outlet valve structure. The adsorption distance between the third magnet 111 and the fourth magnet 112 is 1 to 10 mm.

[0029] The gravity-driven membrane system includes a venturi tube 13 and a gravity-driven membrane system body 14. One end of the venturi tube 13 is connected to a drainage channel, and the other end is connected to the bottom of the gravity-driven membrane system body 14. An aeration port 12 is provided on the venturi tube 13, which is connected to the atmosphere. The high-energy fluid generated by the transient opening of the valve induces the intake of air, realizing synchronized air-water mixing aeration with intermittent water supply. The water storage tank 1 is installed at the inlet end of the gravity-driven membrane pool with a stepped elevation. An overflow port and an overflow pipe are provided on the upper side wall of the gravity-driven membrane system body 14, and the critical trigger water level set by the first permanent magnet 6 in the water storage tank 1 is always higher than the bottom elevation of the overflow port.

[0030] The specific working process of the magnetic intermittent water supply and linkage aeration device for a gravity-driven membrane system described in this embodiment is as follows: 1. Setting and Control of Intermittent Water Supply Period: The intermittent water supply cycle of this device is determined by the effective volume of the water storage tank 1 and the inlet flow rate. Let the cross-sectional area of ​​the water storage tank be S (m²). 2 The effective height of the critical trigger water level relative to the lowest residual water level is H (m). Ignoring the lowest residual water level (dead water level), the effective volume of the water tank is V ≈ S × H (m). 3 Let the influent flow rate be Q_in (m³ / s). 3 If the interval is 5 L / h, then the single interval time T ≈ (S × H) / Q_in (h). From this relationship, it can be seen that the interval time is controlled by three factors: (a) adjusting the critical trigger water level H (by adjusting the permanent magnet adsorption spacing, replacing the magnet, or changing the lever arm ratio). The higher H is, the larger the water storage volume and the longer the interval time, while the pulse head also increases; (b) designing the cross-sectional area S of the water tank. The larger S is, the more water is stored per unit height and the longer the interval time; (c) adjusting the inlet flow rate Q_in (e.g., by setting a regulating valve on the inlet pipe). The smaller Q_in is, the slower the filling and the longer the interval time. Preferably, for household decentralized water supply scenarios (Q_in = 5~20 L / h), the effective volume of the water tank is designed to be 30~120 L, which can achieve an interval cycle of 6~12 hours. This time range has been proven to be the optimal interval operation range for the GDM system. Through the coordinated adjustment of the above three methods, the interval time requirements of different scenarios can be flexibly adapted without changing the overall structure of the device.

[0031] 2. Energy Storage Stage (Locked State): Fluid is slowly discharged into the water storage tank 1 through the inlet 15. The right end of the transmission lever 4 is attracted and locked by the first permanent magnet 6, forcibly pressing down the valve stem 7, so that the bottom return spring 8 is in a compressed energy storage state, the valve 10 is located below the drainage channel, and the drainage channel is statically sealed and closed.

[0032] 3. Critical Threshold Trigger: As the water level rises, the float 3 rises with the water level and applies an upward thrust to the transmission lever 4 through the float push rod 31. Before reaching the critical threshold water level, the magnetic attraction torque of the first permanent magnet 6 keeps the system stationary; when the water level reaches the set height, the torque generated by the thrust on the fixed fulcrum 5 is greater than the magnetic attraction torque of the first permanent magnet 6, and the buoyancy driving torque overcomes the magnetic attraction torque, causing the transmission lever 4 to instantly detach from the magnet 61 and rotate. The critical trigger water level can be set in the following ways: (a) Adjust the attraction distance between the first permanent magnet 6 and the right end of the transmission lever 4 (preferably 1 to 10 mm). The smaller the distance, the greater the magnetic attraction force, and the higher the required trigger water level; (b) Replace the first permanent magnet 6 with one of different magnetic forces; (c) Adjust the lever arm ratio of the transmission lever 4 (left lever arm: right lever arm preferably 1:0.5 to 1:2). The larger the lever arm ratio, the greater the buoyancy driving torque, and the lower the required trigger water level.

[0033] 4. Fluid Pulse Discharge (Intermittent Water Supply): The transmission lever 4 disengages from the attraction of magnet 61 and rotates instantaneously, while being attracted by the magnetic force of magnet 112. Valve stem 7 loses its downward pressure constraint and, driven by the elastic potential energy released by the bottom return spring 8, jumps upward instantaneously, causing valve 10 to move upward and the drain pipe to reach a fully open state. The design parameters of the return spring 8 are: spring stiffness 5–50 N / mm, pre-compression 5–30 mm, and maximum compression stroke 10–50 mm, ensuring that the opening speed of valve stem 7 at the moment of triggering is ≥0.5 m / s. The fluid accumulated in the water storage tank 1 is instantly released in a burst of large flow.

[0034] 5. Linked Aeration and Reset: High-speed pulsed water flow induces the rear jet injector to draw in a large amount of air, generating a violent gas-water two-phase flow in the gravity-driven membrane tank, which shears and scours the membrane surface. After the fluid is drained, the float 3 descends with the water level, pulling the transmission lever 4 to reset and being attracted again by the first permanent magnet 6, entering the next cycle.

[0035] In summary, the magnetic intermittent water supply and linkage aeration device for gravity-driven membrane systems described in this invention can generate powerful linkage aeration and shear stress. Through the coupling of the magnetic threshold and spring force, valve 10 achieves a sudden upward movement upon triggering, instantly opening the drainage channel and realizing high-energy-gap intermittent pulse water supply. Experimental verification shows that after installing this device, the stable flux of the GDM system increased from approximately 8.6 LMH during continuous operation to approximately 14.8 LMH, an increase of over 70%. The intermittently generated high-flow-rate, high-speed water and air bubbles enter the gravity-driven membrane tank, providing a combined effect of intermittent filtration, membrane relaxation, and fluid shear stress on the membrane surface.

[0036] This invention discloses a magnetic intermittent water supply and linked aeration device for gravity-driven membrane systems, which significantly improves the final stable flux of GDM (Geodetic Membrane Diagnostics). The intermittent water supply and linked aeration mechanism formed by the device causes periodic abrupt changes in hydrostatic pressure within the membrane tank, effectively inducing reverse relaxation and expansion of the compacted dense filter cake layer. Simultaneously, the linked pulsed air-water mixing flow generates strong fluid shear stress on the membrane surface. This greatly reduces the filtration resistance of the biofilter cake layer, thereby significantly improving the stable flux of the system under power-free conditions.

[0037] The present invention discloses a magnetic intermittent water supply and linkage aeration device for gravity-driven membrane systems, which features stable and reliable transmission and near-zero maintenance: the introduction of guide column 2 eliminates the lateral drift of the float; the linkage design of "slide groove 41 + sliding pin 32" absorbs the displacement difference between linear and circular motion, completely eliminating the lateral drift and mechanical jamming caused by liquid surface fluctuations in traditional hollow floats, and greatly improving the long-term operational reliability of the device in environments lacking stable power and professional maintenance personnel.

[0038] The present invention discloses a magnetic intermittent water supply and linkage aeration device for gravity-driven membrane systems, which has a precisely adjustable trigger threshold: by adjusting the adsorption distance between the first permanent magnets 6, replacing permanent magnets with different magnetic forces, or adjusting the lever arm ratio of the transmission lever 4, the critical trigger water level can be precisely set to adapt to different water source conditions and process requirements.

[0039] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the invention. They can also be reasonable combinations of the features described in the above embodiments. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A magnetic intermittent water supply and linkage aeration device for a gravity-driven membrane system, characterized in that: It includes a water storage tank (1), a buoyancy drive structure, an outlet valve structure, and a gravity drive membrane system; the water storage tank (1) is connected to the gravity drive membrane system through a drainage channel; the water storage tank (1) is equipped with a buoyancy drive structure and an outlet valve structure, the outlet valve structure includes a transmission linkage structure, a valve stem (7), and a reset element; one end of the buoyancy drive structure and the transmission linkage structure are connected, the middle part of the transmission linkage structure is hinged to the inner wall of the water storage tank (1), the other end of the transmission linkage structure is hinged to one end of the valve stem (7), and the other end of the valve stem (7) passes through the drainage channel and is connected to the reset element; a pair of magnets that attract each other are provided between the transmission linkage structure and the inner wall of the water storage tank (1); a valve (10) is provided on the valve stem (7); the buoyancy drive structure drives the valve stem (7) to move up and down through the transmission linkage structure to realize the opening and closing of the drainage channel.

2. The magnetic intermittent water supply and linkage aeration device for a gravity-driven membrane system according to claim 1, characterized in that: The buoyancy drive structure includes a guide column (2) and a float (3). The float (3) is slidably disposed on the guide column (2), and the float (3) is connected to the transmission linkage structure.

3. The magnetic intermittent water supply and linkage aeration device for a gravity-driven membrane system according to claim 2, characterized in that: The guide post (2) is provided with a maximum stroke stop at the upper end and a minimum stroke stop at the lower end.

4. The magnetic intermittent water supply and linkage aeration device for a gravity-driven membrane system according to claim 2, characterized in that: The upper end of the float (3) is provided with a float push rod (31), and one end of the float push rod (31) is provided with a sliding pin (32), which is slidably connected to the transmission link structure.

5. The magnetic intermittent water supply and linkage aeration device for a gravity-driven membrane system according to claim 1 or 4, characterized in that: The transmission linkage structure includes a transmission lever (4), a connecting rod (9), and a first permanent magnet (6); one end of the transmission lever (4) is slidably connected to the buoyancy drive structure, and the other end is hinged to one end of the connecting rod (9); the other end of the connecting rod (9) is hinged to the valve stem (7); a pair of magnets that attract each other are provided between the transmission lever (4) and the inner wall of the water tank (1).

6. The magnetic intermittent water supply and linkage aeration device for a gravity-driven membrane system according to claim 5, characterized in that: A pair of magnets that attract each other are provided between the hinged end of the transmission lever (4) and the connecting rod (9) and the inner wall of the water outlet valve structure.

7. The magnetic intermittent water supply and linkage aeration device for a gravity-driven membrane system according to claim 5, characterized in that: The transmission lever (4) is provided with a groove (41), and the groove (41) is slidably connected to the buoyancy drive structure.

8. The magnetic intermittent water supply and linkage aeration device for a gravity-driven membrane system according to claim 5, characterized in that: The water storage tank (1) has a fixed support point (5) on its inner wall, and the fixed support point (5) and the transmission lever (4) are hinged in the middle.

9. The magnetic intermittent water supply and linkage aeration device for a gravity-driven membrane system according to claim 1, characterized in that: The gravity-driven membrane system includes a venturi tube (13) and a gravity-driven membrane system body (14), and the drainage channel, the venturi tube (13) and the gravity-driven membrane system body (14) are connected in sequence; an aeration port (12) is provided on the venturi tube (13).

10. The magnetic intermittent water supply and linkage aeration device for a gravity-driven membrane system according to claim 1, characterized in that: The reset element is a reset spring (8).

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