24-hour automatic discharge of stagnant water at the tap end - elastic bladder type - water hammer driven self-flushing valve

Abstract

This invention discloses a 24-hour automatic discharge of stagnant water at the terminal pipes, using a flexible bladder-driven, water hammer-assisted self-flushing valve. It relates to the field of water supply systems and pipeline automatic control technology. The valve includes an inlet pipe, a one-way valve, a flexible contraction bladder, and a discharge valve. One end of the inlet pipe has an inlet for connection to the terminal pipe network, and the other end has an outlet. A side port is also provided near the inlet end of the inlet pipe, and the one-way valve is connected to this side port. The one-way valve is connected to the flexible contraction bladder. The end of the inlet pipe near the outlet is connected to the discharge valve, which is connected to a stagnant water discharge outlet. The flexible contraction bladder and the discharge valve are also linked by a linkage component to control the opening of the discharge valve. This invention enables the periodic automatic discharge and renewal of stagnant water at the terminal pipes and significantly improves the feasibility and reliability of terminal pipe deployment.

Description

Technical Field

[0001] This invention relates to the field of water supply system and pipeline automatic control technology, and in particular to an elastic bladder-type water hammer driven self-flushing valve that automatically discharges stagnant water at the end of the pipe 24 hours a day. Background Technology

[0002] With the increasing demands of urban and rural residents for drinking water quality and water safety, piped drinking water systems, differentiated water supply systems, and centralized rural water supply terminal networks have been widely adopted. However, in actual operation, especially at the end of branch pipes, at the end of the network, and at low-frequency water use points, the water in the pipes is prone to become "stagnant" due to long water usage intervals, low flow velocity, or even long-term stagnation.

[0003] Stagnant water poses several health risks: First, increased contact time between the stagnant water and the pipe walls can lead to a decrease in residual chlorine (or disinfectant) and an increase in odor / turbidity, resulting in a noticeable decline in the taste and sensory quality of the first water used. Second, prolonged stagnant water provides conditions for microbial growth, increasing the risk of bacterial colony proliferation and biofilm formation, thus affecting the hygiene and safety of the final water supply. Third, stagnant water can accelerate the release of sediments and secondary pollution within the pipes, causing fluctuations in water quality at the end of the supply chain. Besides its impact on water quality itself, stagnant water can also negatively affect the operation of pipes and pipe networks: In a stagnant state, sediments are more likely to accumulate in the pipes, forming localized siltation, reducing the effective cross-sectional area for water flow and increasing local resistance; the formation of biofilms and sediment layers can alter the roughness of the inner walls and induce secondary pollution release, leading to intermittent turbidity and water quality fluctuations during subsequent water use; prolonged localized stagnation can also exacerbate scaling and blockage risks in pipe fittings and valves, thereby reducing the reliability of the water supply at the end of the pipe network.

[0004] Existing automatic treatment / discharge solutions for stagnant water at the end of the water supply pipe typically involve installing a venting solenoid control valve at the end of the water supply pipe and connecting it to a control circuit to achieve automatic discharge. This can be achieved by setting the discharge frequency and duration to allow for periodic discharge, and can be optionally equipped with a water flow detection unit to trigger the solenoid valve to open and discharge when the water flow stagnation time exceeds a threshold. Alternatively, stagnant water can be introduced into a storage unit through a check valve and a water tank, and the control unit can control a water pump to return the water in the storage tank to the tap water system for recycling. This can also be combined with a flow meter and display module for monitoring and display.

[0005] However, the aforementioned automated treatment / discharge solutions for stagnant water at the end of the water supply chain all require the coordinated operation of components such as solenoid valves, control circuits, sensors, or pumps and water storage units. Therefore, they are often difficult to deploy stably in rural water supply systems (where the terminals are dispersed, power supply is unstable, outdoor environments are complex, maintenance resources are limited, and installation space and costs are constrained). On the one hand, active electrical control solutions place demands on power supply, waterproofing and theft prevention of wiring, control reliability, and subsequent maintenance. On the other hand, solutions with water storage and pump return systems are more complex, involving additional equipment and pipelines, further increasing the workload of installation and maintenance. In rural peripheral water pipes or remote water points, the aforementioned solutions that "rely on external power and multi-component coordination" generally face difficulties in implementation and long-term operation and maintenance.

[0006] Therefore, an elastic bladder-driven water hammer self-flushing valve that automatically discharges stagnant water at the tips of the pipes is provided to solve the above-mentioned problems existing in the prior art. Summary of the Invention

[0007] The purpose of this invention is to provide an elastic bladder-type water hammer driven self-flushing valve that automatically discharges stagnant water at the terminal level for 24 hours, in order to solve the problems existing in the prior art. It can realize the periodic automatic discharge and renewal of stagnant water at the terminal level and significantly improve the feasibility and reliability of terminal deployment.

[0008] To achieve the above objectives, the present invention provides the following solution: This invention provides a 24-hour automatic discharge of stagnant water at the terminal pipes using an elastic bladder-driven water hammer self-flushing valve. The valve includes an inlet pipe, a one-way valve, an elastic contraction bladder, and a discharge valve. One end of the inlet pipe has an inlet for connection to the terminal pipe network, and the other end has an outlet. A side port is also provided at the end of the inlet pipe near the inlet, and the one-way valve is connected to the side port. The one-way valve is connected to the elastic contraction bladder. The end of the inlet pipe near the outlet is connected to the discharge valve, which is connected to a stagnant water discharge outlet. The elastic contraction bladder and the discharge valve are also linked by a linkage component to control the opening of the discharge valve.

[0009] Preferably, the elastic contraction bladder is made of a composite elastomer material, and the designed burst pressure of the elastic contraction bladder is 2~5MPa.

[0010] Preferably, the composite elastomer material comprises: 60-80 wt% thermoplastic polyester elastomer, 10-20 wt% aramid staple fiber, 3-8 wt% graphene microsheets, and the balance of auxiliary materials; the auxiliary materials include processing aids and masterbatch carriers.

[0011] Preferably, the elastic contraction bladder is further connected to a water seepage component, which is used to control the slow seepage of water from the elastic contraction bladder and create a delay, wherein the delay duration is 12~72 h.

[0012] Preferably, the water-permeable component includes a microporous capillary tube connected to the elastic contraction bladder, wherein the equivalent pore diameter of the microporous capillary tube is 0.1~0.6 mm and the equivalent length is 10~100 mm.

[0013] Preferably, the permeation component further includes a pressure equalization membrane, which is connected in parallel with the microporous capillary.

[0014] Preferably, the linkage component includes a quick-release lever and a linkage module. One end of the quick-release lever is connected to the elastic contraction bladder, and the other end is linked to the discharge valve through the linkage module.

[0015] Preferably, the discharge valve is a ball valve.

[0016] Preferably, the dead water outlet is further connected to an external guide component, which is a permeable capillary tube.

[0017] The present invention achieves the following technical effects compared to the prior art: The elastic bladder-driven water hammer self-flushing valve for 24-hour automatic discharge of stagnant water at the end of the pipe network in this invention mainly includes an inlet short pipe, a one-way valve, an elastic contraction bladder, and a discharge valve. One end of the inlet short pipe has an inlet for connection to the end pipe network, and the other end has an outlet. A side port is also provided at the end of the inlet short pipe near the inlet, and the one-way valve is connected to the side port. The one-way valve is connected to the elastic contraction bladder. The end of the inlet short pipe near the outlet is connected to the discharge valve, which is connected to the stagnant water discharge port to discharge the water to a designated downstream drainage ditch. The elastic contraction bladder and the ball valve are linked by a linkage component to control the opening of the ball valve.

[0018] When the peak water hammer generated by the terminal pipe network reaches a preset threshold (e.g., ≥0.15MPa), the one-way valve opens, allowing water in the pipe to enter the elastic contraction bladder in one direction to complete charging. When the elastic contraction bladder contracts and generates displacement, it can overcome the pre-tightening force of the discharge valve's reset spring through the linkage component and trigger the discharge valve to open quickly, discharging the stagnant water. After discharge, the discharge valve returns to its initial state under the action of the elasticity and pre-tightening force of the reset spring.

[0019] This invention utilizes the water hammer generated during users' daily water usage to generate and recharge energy, enabling the periodic automatic discharge and renewal of stagnant water at the end of the terminal. This avoids the risks of unstable power supply, maintenance difficulties, and theft associated with active components such as solenoid valves, control circuits, sensors, or water pumps in rural scenarios, significantly improving the feasibility and reliability of terminal deployment. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a top view of the elastic bladder-water hammer driven self-flushing valve for automatically discharging stagnant water at the tips of the tap in an embodiment of the present invention. Figure 2 This is a front view of the elastic bladder-water hammer driven self-flushing valve that automatically discharges stagnant water at the tips of the tap in an embodiment of the present invention for 24 hours. Figure 3 This is a side view of the elastic bladder-water hammer driven self-flushing valve for automatic discharge of stagnant water at the tips of the tap in an embodiment of the present invention. Figure 4 This is a schematic diagram illustrating the linkage between the quick-release lever and the ball valve in an embodiment of the present invention.

[0022] In the diagram: 1-Inlet; 2-Inlet short pipe; 3-T-pipe; 4-Outlet; 5-One-way valve; 6-Elastic contraction bladder; 7-Instant release lever; 8-Linkage module; 9-Drain valve; 10-Dead water discharge port. 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. 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.

[0024] The purpose of this invention is to provide an elastic bladder-type water hammer driven self-flushing valve that automatically discharges stagnant water at the terminal level for 24 hours, in order to solve the problems existing in the prior art. It can realize the periodic automatic discharge and renewal of stagnant water at the terminal level and significantly improve the feasibility and reliability of terminal deployment.

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1 like Figures 1-4As shown, this embodiment provides a 24-hour automatic discharge of stagnant water at the end of water supply branches, using an elastic bladder-driven water hammer self-flushing valve. It can be used for automatic replacement of stagnant water at the end of rural water supply branch pipes. The valve mainly includes an inlet pipe 2, a one-way valve 5, an elastic contraction bladder 6, and a discharge valve 9. One end of the inlet pipe 2 has an inlet 1 for connection to the end pipe network, and the other end has an outlet 4. The end of the inlet pipe 2 near the inlet 1 also has a side port, where the one-way valve 5 is connected. The one-way valve 5 is connected to the elastic contraction bladder 6. The end of the inlet pipe 2 near the outlet 4 is connected to the discharge valve 9 via a three-way pipe 3. The discharge valve 9 is connected to a stagnant water discharge port 10 to discharge water to a designated downstream drainage ditch. The elastic contraction bladder 6 and the discharge valve 9 are linked by a linkage component to control the opening of the discharge valve 9.

[0027] In this embodiment, when the peak water hammer generated by the terminal pipe network reaches a preset threshold (e.g., ≥0.15MPa), the one-way valve 5 opens, allowing the water in the pipe to enter the elastic contraction bladder 6 in one direction to complete charging. When the elastic contraction bladder 6 contracts and generates displacement, it can overcome the pre-tightening force of the return spring of the discharge valve 9 through the linkage component and trigger the discharge valve 9 to open quickly, discharging the stagnant water. After the discharge is completed, the discharge valve 9 returns to its initial state under the action of the elasticity and pre-tightening force of the return spring.

[0028] In this embodiment, the water hammer generated during the user's daily water use is used for self-energy extraction and recharging, realizing the periodic automatic discharge and renewal of stagnant water at the end point. This avoids the unstable power supply, maintenance difficulties, and theft risks of active components such as solenoid valves, control circuits, sensors, or water pumps in rural scenarios, significantly improving the feasibility and reliability of end-point deployment.

[0029] In this embodiment, the inlet short pipe 2 is preferably a DN20 short pipe.

[0030] In this embodiment, the elastic contraction bladder 6 can be made of a chlorine-resistant and fatigue-resistant composite elastomer material, specifically TPEE thermoplastic polyester elastomer material, with a thickness of about 1.2 mm and a volume of about 60 mL. The designed burst pressure is not less than 2 MPa, preferably 2~5 MPa, to ensure the reliability and safety of the charging and triggering process.

[0031] In this embodiment, the composite elastomer material comprises: 60-80 wt% thermoplastic polyester elastomer, 10-20 wt% aramid staple fiber, and 3-8 wt% graphene microsheets. The auxiliary materials include processing aids and masterbatch carriers, with the remainder being wt% and the balance. TPEE (thermoplastic polyester elastomer) serves as the matrix material, providing the elastic deformation capacity required for repeated expansion, contraction, and repositioning of the elastic contraction bladder 6, while also considering fatigue resistance and processing performance. Aramid staple fibers are dispersed in the TPEE matrix as a reinforcing phase to improve the tensile strength, tear resistance, and burst resistance of the elastic contraction bladder 6, and to inhibit fatigue crack propagation in repeated water filling-contraction cycles. Graphene microsheets are dispersed in the TPEE matrix as a layered barrier filler to extend the diffusion path of water molecules and oxidizing media in chlorinated water, reducing the chlorine and water permeation rates of the material, thereby improving the chlorine aging resistance and long-term service stability of the elastic contraction bladder 6. The auxiliary materials include processing aids and masterbatch carriers, used to improve the dispersion uniformity and interfacial bonding performance of each component in the TPEE matrix, and to improve the processing stability and long-term aging resistance of the composite elastomer material.

[0032] As a preferred embodiment, the formulation of the composite elastomer material is as follows: 70 wt% TPEE (thermoplastic polyester elastomer), 15 wt% aramid staple fiber, 5 wt% graphene microsheets, and the remaining 10 wt% is processing aids and masterbatch carrier. The specific composition is determined according to process adjustments. Using the above formulation, the elastic contraction bladder 6 exhibits significantly improved resistance to chlorinated water penetration, with its chlorine penetration coefficient reduced by approximately 60% compared to the unmodified TPEE substrate. Simultaneously, the material's tensile strength reaches 48 MPa, and it withstands 10 seconds of folding fatigue testing. 5 No cracks were generated in the second cycle, thus ensuring that the elastic contraction bladder 6 has higher reliability and service life under long-term "charging-timing-triggering-resetting" cycle conditions.

[0033] In this embodiment, the elastic contraction bladder 6 is also connected to a water seepage component, which is used to control the slow seepage of water from the elastic contraction bladder 6 and create a delay. The preset delay can be 12~72 h, preferably 20~30 h, and more preferably about 24 h. The water seepage component includes a microporous capillary, specifically a microporous stainless steel capillary. The microporous capillary is connected to the elastic contraction bladder 6. The equivalent pore diameter of the microporous capillary can be 0.1~0.6 mm, and the equivalent length can be 10~100 mm. By changing the size parameters of the microporous capillary, the discharge cycle of water from the elastic contraction bladder 6 can be controlled.

[0034] In a preferred embodiment, the microporous capillary has dimensions of Ø0.3mm × 30mm, i.e., an equivalent pore diameter of 0.3mm and an equivalent length of 30mm, to ensure an intracapsular permeation time of approximately 24 hours. Furthermore, the permeation assembly also includes a pressure equalizing membrane, preferably a silicone rubber pressure equalizing membrane (0.2mm thick, with a permeability of approximately 2mL·h). -1 It is connected in parallel with the microporous capillary for temperature compensation, so that the timing error is controlled within ±8% in the range of -5℃ to 40℃.

[0035] In this embodiment, the linkage component mainly includes a quick-release lever 7 and a linkage module 8. One end of the quick-release lever 7 is connected to the elastic contraction bladder 6, and the other end is linked to the discharge valve 9 through the linkage module 8. The linkage module 8 can be selected according to specific working needs, for example, it can be a gear linkage module.

[0036] In this embodiment, the linkage module 8 may include a rack and a bevel gear. The rack is connected to the output end of the quick-release lever 7, and the bevel gear is coaxially connected to the valve stem of the discharge valve 9 or connected via a valve stem connector. When the elastic contraction bladder 6 contracts and displaces due to water seepage, the quick-release lever 7 amplifies this displacement and pushes the rack to move. The rack drives the gear to rotate, thereby driving the valve core of the discharge valve 9 to rotate to the open position. After discharge is completed, the return spring of the discharge valve 9 drives the valve stem and gear to rotate in the opposite direction, causing the discharge valve 9 to return to the closed state, thus entering the next timing cycle.

[0037] When water seepage from the seepage component causes the elastic contraction bladder 6 to contract and displace, the quick-release lever 7 amplifies the displacement according to a preset lever ratio. When the stroke reaches a threshold (e.g., ≥4mm), it overcomes the preload of the return spring of the discharge valve 9 and triggers rapid opening. To achieve a delay trigger of approximately 24 hours, the timing relationship for the seepage component in this embodiment is established as follows: Where t is the timing period; V is the effective volume of the elastic contraction bladder; η is the dynamic viscosity coefficient of water; d is the equivalent pore diameter of the microporous capillary; L is the equivalent length of the microporous capillary; ΔT is the difference between the ambient temperature and 20℃; and k is a calibration coefficient related to structural morphology, flow resistance coefficient, etc.

[0038] In this embodiment, substituting the above timing equation yields t≈24.2h; the measured timing period under the same structural parameters is 23.7h. This indicates that the timing equation can be used for the design of the permeable component and the selection of aperture and length parameters in this embodiment, and can be combined with the ΔT term to correct for period deviations caused by temperature changes.

[0039] In this embodiment, the discharge valve 9 is preferably a ball valve, and the ball valve can be a 90° straight-through structure with a ceramic ball valve core and an orifice diameter of 8mm; it achieves short-term full opening under the triggering of the quick-release lever 7, with a full opening time of about 1 second and a flow rate of about 1L·s. -1 This method ensures that stagnant water at the end is drained in one go. To guarantee a reliable long-term seal and prevent continuous leakage of water in the non-triggered state of the ball valve in this embodiment, and to ensure that it can be reliably overcome and quickly opened by the quick-release lever 7 when triggered, the return spring of the ball valve in this embodiment is preloaded with a force F0 = 6N. This preload corresponds to a torque of approximately 0.4N·m required for the ball valve to maintain its opening, and can form a sealing pressure of approximately [value missing] on the sealing surface of the ceramic ball valve, thereby enabling the discharge valve 9 to achieve a zero-leakage sealing effect in the normally closed state. Sealing performance verification shows that it meets the zero-leakage requirements of EN13828 for valve sealing.

[0040] In this embodiment, the dead water outlet 10 is connected to an external drainage component, which can be a 1m long, Ø10mm permeable capillary tube, so that the drainage seeps into the selected drainage ditch and avoids surface erosion.

[0041] In this embodiment, water hammer generated during daily water use is used to unidirectionally charge the elastic contraction bladder 6 through the inlet short pipe 2 and the one-way valve 5. Subsequently, the "timing-pressure stabilization" process inside the elastic contraction bladder 6 is realized through the parallel connection of the microporous capillary and the silicone rubber equalizing membrane. When the bladder's contraction displacement accumulates to the threshold, the quick-release lever 7 triggers the ball valve to open rapidly, causing the ball valve to open fully for a short time and discharge the dead water in one go. After the discharge is completed, the ball valve returns to the initial state under the action of structural elasticity and pre-tightening force, and enters the next timing cycle, thereby realizing automatic discharge of about 24 hours and renewal of about 1L of dead water at the end of the cycle.

[0042] Example 2 In this embodiment, the application target is the end of a DN20 branch pipe, with a static pressure of 0.35 MPa and a water hammer peak of 0.22 MPa. Under these conditions, a 24-hour automatic discharge valve for stagnant water at the end of the branch pipe is installed: the elastic contraction bladder has a volume of 60 mL, and the microporous capillary diameter of the seepage component is Ø0.3 mm. At an ambient temperature of 25℃, the 24-hour automatic discharge valve for stagnant water at the end of the branch pipe can achieve periodic automatic triggering discharge, with a measured discharge cycle of 23.5 hours; each discharge volume is approximately 1.0 L. End-point water quality testing showed a total bacterial count of 180 CFU·mL. -1 Reduced to 15 CFU / mL -1 This indicates that this embodiment can effectively renew the stagnant water at the end and improve the water quality at the end.

[0043] Example 3 In this embodiment, under the same operating conditions at the end of the DN20 branch pipe as in Embodiment 2 (static pressure 0.35MPa, water hammer peak 0.22MPa, elastic contraction bladder 6 volume 60mL, temperature 25℃), only the diameter of the microporous capillary of the seepage component was adjusted from Ø0.3mm to Ø0.25mm. After the adjustment, the discharge cycle of the device was extended to 30h. This cycle still meets the requirement of T / CHES35 of the Rural Drinking Water Safety Evaluation Criteria for a terminal retention time of ≤72h. This shows that the discharge cycle can be adjusted and controlled by changing the capillary parameters, thereby adapting to the terminal replacement needs under different regions and water usage habits.

[0044] This invention features a 24-hour automatic discharge of stagnant water at the end of the water supply system. The elastic bladder-type water hammer-driven self-flushing valve requires no external power supply and is suitable for long-term operation at rural end-point nodes. This invention utilizes the water hammer generated during users' daily water use for self-energy extraction and recharging, achieving periodic automatic discharge and renewal of stagnant water at the end of the water supply system. This avoids the unstable power supply, maintenance difficulties, and theft risks associated with active components such as solenoid valves, control circuits, sensors, or water pumps in rural scenarios, significantly improving the feasibility and reliability of end-point deployment.

[0045] Furthermore, the elastic bladder-type water hammer-driven self-flushing valve of this invention, which automatically discharges stagnant water at the terminal outlet for 24 hours, significantly improves the water quality at the terminal outlet and has strong structural durability. Under the conditions of a static pressure of 0.35 MPa, a water hammer peak of 0.22 MPa, and a temperature of 25°C in a DN20 terminal branch pipe, the measured discharge cycle of this invention is approximately 23.5 hours, with a single discharge of approximately 1.0 L, and the total bacterial count at the terminal outlet is reduced from 180 CFU·mL. -1 Reduced to 15 CFU / mL -1 This indicates that it has a significant effect on the renewal of peripheral water bodies and the control of microbial risks; in addition, the elastic contractile bladder 6 adopts a TPEE composite reinforcement formula, which can improve the resistance to chlorine penetration and fatigue life (the chlorine penetration coefficient is reduced by about 60%, and the folding fatigue is reduced by 10). 5 (Crack-free), suitable for long-term outdoor cyclic working conditions in rural areas.

[0046] Furthermore, the timing cycle of the elastic bladder-water hammer driven self-flushing valve for automatic 24-hour discharge of stagnant water at the end of the tap in this invention can be designed and calibrated, and can stably achieve approximately 24-hour discharge and adapt to different needs. This invention uses "elastic contraction bladder 6 + microporous capillary damping" to form a daily delay. The timing equation guides the selection of orifice diameter and length. Under the conditions of this invention, t≈24.2h is calculated, and the actual measurement is approximately 23.7h. When the capillary orifice is adjusted to Ø0.25mm, the cycle can be extended to 30h, indicating that this invention can achieve adjustable design of the discharge cycle through damping parameters and meet the control requirement of rural end-of-pipe retention time ≤72h.

[0047] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A flexible bladder-type water hammer driven self-flushing valve for 24-hour automatic discharge of stagnant water at the tips of pipes, characterized in that: The system includes an inlet pipe (2), a one-way valve (5), an elastic contraction bladder (6), and a drain valve (9). One end of the inlet pipe (2) is provided with an inlet (1) for connecting to the end pipe network, and the other end is provided with an outlet (4). The end of the inlet pipe (2) near the inlet (1) is also provided with a side port, and the one-way valve (5) is connected to the side port. The one-way valve (5) is connected to the elastic contraction bladder (6). The end of the inlet pipe (2) near the outlet (4) is connected to the drain valve (9), and the drain valve (9) is connected to the dead water outlet (10). The elastic contraction bladder (6) and the drain valve (9) are also linked by a linkage component to control the opening of the drain valve (9).

2. The elastic bladder-type water hammer driven self-flushing valve for 24-hour automatic discharge of stagnant water at the tips of the tap, as described in claim 1, is characterized in that: The elastic contraction bladder (6) is made of composite elastomer material, and the designed burst pressure of the elastic contraction bladder (6) is 2~5MPa.

3. The elastic bladder-type water hammer driven self-flushing valve for 24-hour automatic discharge of stagnant water at the tips of the tap, as described in claim 2, is characterized in that: The composite elastomer material comprises: 60-80 wt% thermoplastic polyester elastomer, 10-20 wt% aramid staple fiber, 3-8 wt% graphene microsheets, and the balance of auxiliary materials; the auxiliary materials include processing aids and masterbatch carriers.

4. The elastic bladder-type water hammer driven self-flushing valve for 24-hour automatic discharge of stagnant water at the terminal as described in any one of claims 1 to 3, characterized in that: The elastic contraction bladder (6) is also connected to a water seepage component, which is used to control the slow seepage of water in the elastic contraction bladder (6) and form a delay, wherein the delay duration is 12~72 h.

5. The elastic bladder-type water hammer driven self-flushing valve for 24-hour automatic discharge of stagnant water at the tips of the tap, as described in claim 4, is characterized in that: The water-permeable component includes a microporous capillary tube connected to the elastic contraction bladder (6). The microporous capillary tube has an equivalent pore size of 0.1~0.6 mm and an equivalent length of 10~100 mm.

6. The elastic bladder-type water hammer driven self-flushing valve for 24-hour automatic discharge of stagnant water at the tips of the tap, as described in claim 5, is characterized in that: The permeation component also includes a pressure equalization membrane, which is connected in parallel with the microporous capillary.

7. The elastic bladder-type water hammer driven self-flushing valve for 24-hour automatic discharge of stagnant water at the tips of the tap, as described in claim 1, is characterized in that: The linkage component includes a quick-release lever (7) and a linkage module (8). One end of the quick-release lever (7) is connected to the elastic contraction bladder (6), and the other end is linked to the discharge valve (9) through the linkage module (8).

8. The elastic bladder-type water hammer driven self-flushing valve for 24-hour automatic discharge of stagnant water at the tips of the tap, as described in claim 1, is characterized in that: The discharge valve (9) is a ball valve.

9. The elastic bladder-type water hammer driven self-flushing valve for 24-hour automatic discharge of stagnant water at the tips of the tap, as described in claim 1, is characterized in that: The dead water outlet (10) is also connected to an external guide component, which is a permeable capillary tube.

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