A time-delay self-closing water-saving valve and a control method thereof

Abstract

The application relates to the technical field of valves, and discloses a delay self-closing water-saving valve and a control method thereof, which comprises a valve body, a water outlet arranged on one side of the valve body, and a water inlet arranged at the bottom end of the valve body; a press-out-water assembly is arranged on the valve body; a delay assembly is arranged in the valve body, the delay assembly comprises an inner cylinder mounted in the inner cavity of the valve body, the upper end of the inner cylinder is movably and sealingly connected to the inner side of a lifting cylinder, and a rotating shaft is rotatably arranged in the inner cylinder. The delay self-closing water-saving valve is provided with the press-out-water assembly matched with the delay assembly, the lifting cylinder can be kept still for a period of time when the press-out-water assembly is pressed, so that the water outlet can continuously discharge water for a period of time under the condition that the flow rate is kept unchanged; compared with the traditional mode that the flow rate gradually decreases until the valve is closed after being pressed, the delay self-closing water-saving valve can better meet the single basic water demand of a user, the use convenience is improved, and water resources are saved to a certain extent.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a time-delay self-closing water-saving valve and its control method. Background Technology

[0002] The time-delay self-closing water-saving valve is a fluid control device that features press-triggered water dispensing, automatic delayed closure without manual shut-off. Its core principle involves the use of internal springs, hydraulic or pneumatic structures to dispense water after user press, automatically cutting off the water flow after a preset delay, thus reducing water waste. This type of water-saving valve is widely used in public places (such as restrooms in shopping malls, schools, and hospitals), home kitchens, washbasins, and other water-using scenarios. It is particularly suitable for short-term water usage, meeting basic cleaning and rinsing needs while effectively preventing continuous water flow due to forgetting to close the valve. It is a commonly used core component in the current water-saving appliance field.

[0003] Existing time-delay self-closing water-saving valves still have certain shortcomings that need improvement in practical applications, especially miniaturized water-saving valves adapted to faucets, where the problems are more prominent. The internal delay structure of some products is poorly designed, and the reset speed after pressing is too fast, resulting in a short water output duration. This often fails to meet the user's basic water demand for a single use. Sometimes, the valve automatically closes before the user has finished using the water, so the user has to press it a second or even multiple times. This problem not only reduces the convenience of use, but also increases the wear and tear on the valve due to repeated operation. In addition, the extra water flow is wasted during the second pressing process, which weakens its water-saving effect. Summary of the Invention

[0004] The technical problem to be solved by this invention is that the small time-delay self-closing water-saving valve adapted to faucets has an unreasonable time-delay structure design, which leads to rapid reset and short water output time. It is easy for the valve to close before the water usage is completed, requiring a second press, which affects the convenience of use, increases valve wear, and causes additional water waste. To address this, we propose a time-delay self-closing water-saving valve and its control method.

[0005] To achieve the above objectives, this application adopts the following technical solution: a time-delay self-closing water-saving valve, comprising a valve body, an outlet disposed on one side of the valve body, and an inlet disposed at the bottom of the valve body;

[0006] The valve body is equipped with a press-to-discharge assembly, which includes a button located at the top of the valve body. A first spring is provided between the bottom of the button and the top of the valve body. A lifting cylinder is movably arranged inside the valve body. The upper end of the lifting cylinder is installed at the bottom of the button. A sealing ring corresponding to the water outlet is provided on the outer wall of the lower end of the lifting cylinder. An expansion part corresponding to the sealing ring is provided on the inner wall of the valve body.

[0007] The valve body is equipped with a delay component, which includes an inner cylinder installed in the inner cavity of the valve body. The upper end of the inner cylinder is movably and sealingly connected to the inner side of the lifting cylinder. A rotating shaft is rotatably installed in the inner cylinder. A drive cylinder frame that is movably sleeved with the rotating shaft is installed on the inner wall of the lifting cylinder. A guide groove assembly is provided on the outer wall of the rotating shaft. A guide block for movably cooperating with the guide groove assembly is provided on the inner wall of the drive cylinder frame. A resistance cavity is provided on the inner side of the lower end of the inner cylinder. A fixed plate is installed on one end of the inner side of the resistance cavity. A movable plate that is movably connected to the resistance cavity is provided on the lower side wall of the rotating shaft. A second channel and a first channel with different inner diameters are provided on the movable plate. A one-way valve is provided on both the second channel and the first channel. An elastic torsion assembly for resetting the rotating shaft is provided in the inner cylinder. A limit block is provided on the inner wall of the lifting cylinder. An overlapping assembly for overlapping with the limit block is provided on the upper end of the rotating shaft.

[0008] Preferably, in the initial state of the elastic torsion component, the overlapping component and the limiting block are staggered.

[0009] Preferably, the overlapping component includes a square tube installed on the upper side wall of the rotating shaft, an overlapping block corresponding to the limiting block is movably arranged on the inner side of the square tube along the radial direction of the rotating shaft, a second spring is arranged between one end of the overlapping block and the inner wall of the square tube, and the upper end of the overlapping block is sloped.

[0010] Preferably, the overlapping assembly includes a U-shaped shell installed on the upper side wall of the rotating shaft, an overlapping block is provided on the inner side of the U-shaped shell, a pin is provided on the side wall of the overlapping block, a blind hole corresponding to the pin is provided on the inner wall of the U-shaped shell, the pin is rotatably disposed inside the blind hole, and a second torsion spring is installed between the side wall of the pin and the inner wall of the blind hole.

[0011] Preferably, the guide groove assembly includes a first guide groove disposed on the side wall of the rotating shaft and in a spiral shape, a vertical second guide groove disposed at the lower end of the first guide groove, an arc-shaped first reset groove disposed at the bottom of the second guide groove, a second reset groove corresponding to the first guide groove being vertically disposed at the end of the first reset groove away from the second guide groove, and the upper end of the second reset groove being connected to the upper end of the first guide groove;

[0012] The upper end of the second reset groove is provided with a slope corresponding to the upper end of the first guide groove. The guide block is movably connected to the inner cavity side wall of the drive cylinder frame, and one end of the guide block is provided with an elastic element at the inner wall of the insertion point.

[0013] Preferably, the elastic torsion assembly includes an annular shell mounted on the top of the resistance chamber, the annular shell being located outside the rotating shaft and movably connected to the rotating shaft, and a first torsion spring being installed between the inner wall of the annular shell and the outer wall of the rotating shaft.

[0014] Preferably, the inner cavity of the resistance chamber is filled with hydraulic oil.

[0015] Preferably, a cone-shaped filter screen is installed on the inside of the water inlet.

[0016] Preferably, the lower end of the rotating shaft extends to the bottom of the filter screen and is provided with a scraper strip corresponding to the lower surface of the filter screen;

[0017] A sludge discharge port is connected to one side of the water inlet. A sludge storage box is detachably installed at one end of the sludge discharge port, and a valve is installed on the sludge discharge port.

[0018] The present invention also relates to an embodiment, specifically a control method for a time-delay self-closing water-saving valve, comprising the following steps:

[0019] S1: First, press the button to move the lifting cylinder down. When the sealing ring aligns with the expansion part, the water in the inlet enters the outlet through the expansion part.

[0020] S2: After pressing the button, the lifting cylinder will remain stationary for a period of time due to the cooperation of the limit block in the delay component and the overlapping component, during which water will continuously flow from the outlet.

[0021] S3: When the overlapping component separates from the limit block, the button and the lifting cylinder gradually rise and reset, the sealing ring rises to seal the water outlet, and the water outlet stops flowing.

[0022] The technical effects and advantages of this invention are as follows:

[0023] In this invention, by combining the press-to-discharge component with the delay component, the lifting cylinder can remain stationary for a period of time when the water is pressed, so that the water outlet can continuously discharge water for a period of time while maintaining a constant flow rate. Compared with the traditional method of gradually decreasing the flow rate after pressing until it is turned off, this method better meets the user's basic water needs for a single use, increases the convenience of use, and also saves water resources to a certain extent.

[0024] In this invention, by setting a conical filter screen in conjunction with scraper, discharge port, impurity storage box and valve, the surface of the filter screen can be cleaned and collected when pressing water, which can prevent impurities from clogging the surface of the filter screen and affecting the subsequent water output. Attached Figure Description

[0025] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0026] Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0028] Figure 3 This is a structural schematic diagram of the inner cylinder and the lifting cylinder of the present invention in their disassembled state;

[0029] Figure 4 This is a schematic diagram of the internal structure of the lifting cylinder of the present invention;

[0030] Figure 5 This is a schematic diagram of the internal structure of the inner cylinder of the present invention;

[0031] Figure 6 This is a schematic diagram of the cross-sectional structure of the lower end of the inner cylinder of the present invention;

[0032] Figure 7 This is a three-dimensional cross-sectional view of the lower end of the inner cylinder of the present invention.

[0033] Figure 8 This is a structural schematic diagram of the drive cylinder frame and rotating shaft of the present invention in a disassembled state;

[0034] Figure 9 For the rotating shaft of the present invention Figure 8 A structural diagram from another perspective based on this;

[0035] Figure 10 This is a schematic diagram of the structure of the first embodiment of the overlapping component of the present invention;

[0036] Figure 11 This is a structural schematic diagram of a second embodiment of the overlapping component of the present invention.

[0037] Legend: 1. Valve body; 2. Button; 3. Outlet; 4. Storage box; 5. Drain; 6. Valve; 7. Air vent; 8. First spring; 9. Filter screen; 10. Lifting cylinder; 11. Inner cylinder; 12. Sealing ring; 13. Rotating shaft; 14. Expansion section; 15. Drive cylinder frame; 16. Resistance chamber; 17. Limiting block; 18. Scraper; 19. First roller; 20. Square tube; 21. Overlapping block; 22. Fixing element. 23. Plate; 24. Movable plate; 25. First channel; 26. Second channel; 27. Annular shell; 28. First torsion spring; 29. ​​Guide block; 30. First guide groove; 31. Second guide groove; 32. Second spring; 33. U-shaped shell; 34. Water inlet; 35. Pin; 36. Second torsion spring; 37. Blind hole; 38. First reset groove; 39. Second reset groove; 40. Ramp; 41. Elastic element. Detailed Implementation

[0038] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0039] Reference Figures 1-9As shown, a time-delay self-closing water-saving valve includes a valve body 1, an outlet 3 disposed on one side of the valve body 1 and communicating with the inner cavity of the valve body 1, and an inlet 34 communicating with the bottom end of the valve body 1. A push-to-discharge assembly is provided on the valve body 1. In a preferred embodiment, the push-to-discharge assembly includes a button 2 movably sleeved on the outer side of the top of the valve body 1. A first spring 8 for the button 2 to rise and reset is provided between the inner bottom side of the button 2 and the top of the valve body 1. A lifting cylinder 10 is movably sealed on the inner side of the upper end of the valve body 1. The upper end of the lifting cylinder 10 is installed at the bottom of the button 2. The lower outer wall of the lifting cylinder 10 is provided with a sealing ring 12 corresponding to the water outlet 3. The inner wall of the valve body 1 is provided with an expansion part 14 corresponding to the sealing ring 12. The inner diameter of the expansion part 14 is larger than the inner diameter of the valve body 1. Initially, the sealing ring 12 is located at the upper end of the expansion part 14, blocking the water outlet 3. When the sealing ring 12 is located at the sealing ring 12, a gap is generated between the sealing ring 12 and the inner wall of the expansion part 14, and the water below can enter the water outlet 3 through this gap.

[0040] To achieve delayed rising of the lifting cylinder 10, a delay component is provided in the valve body 1. In a preferred embodiment, the delay component includes an inner cylinder 11 fixedly installed within the inner cavity of the valve body 1. The top of the inner cylinder 11 is open, and the bottom is closed. The upper end of the inner cylinder 11 is movably and sealingly connected to the inner side of the lifting cylinder 10. A rotating shaft 13 is rotatably mounted in the middle of the inner cavity of the inner cylinder 11. A drive cylinder frame 15, movably sleeved with the rotating shaft 13, is installed on the inner wall of the lifting cylinder 10. A guide groove assembly is provided on the outer wall of the rotating shaft 13. The guide groove assembly includes a first guide groove 29 spirally disposed on the side wall of the rotating shaft 13. A vertical second guide groove 30 is provided at the lower end of the first guide groove 29. An arc-shaped first reset groove 38 is provided at the bottom of the second guide groove 30. A second reset groove 39, corresponding to the first guide groove 29, is vertically arranged at the end of the reset groove 38 away from the second guide groove 30. The upper end of the second reset groove 39 is connected to the upper end of the first guide groove 29. The upper end of the second reset groove 39 is provided with a ramp 40 corresponding to the upper end of the first guide groove 29. The guide block 28 is movably inserted into the inner wall of the drive cylinder frame 15. An elastic element 41, preferably a spring, is provided at one end of the guide block 28 and the inner wall of the insertion point. The inner wall of the drive cylinder frame 15 is provided with a guide block 28 for movably cooperating with the guide groove assembly. The configuration is such that when the guide block 28 moves down in the first guide groove 29, it can drive the rotating shaft 13 to rotate. The second guide groove 30, the first reset groove 38, the first guide groove 29, and the second reset groove 38 are connected to the first guide groove 29. The inner wall of the groove 39 has a smooth transition. A resistance chamber 16 is provided on the inner side of the lower end of the inner cylinder 11. The inner cavity of the resistance chamber 16 is filled with hydraulic oil. A fixed plate 22 is installed on one end of the inner side of the resistance chamber 16. A movable plate 23 is provided on the lower side wall of the rotating shaft 13 and is movably connected to the resistance chamber 16. One end of the fixed plate 22 is movably connected to the side wall of the rotating shaft 13. A second channel 25 and a first channel 24 with different inner diameters are provided on the movable plate 23. The inner diameter of the first channel 24 is larger than that of the second channel 25. Both the second channel 25 and the first channel 24 are provided with check valves. The two check valves are in opposite directions. During the water dispensing stage, the hydraulic oil in the resistance chamber 16 flows through the first channel 24 with the larger inner diameter. When the water outlet is closed, the hydraulic oil in the resistance chamber 16 flows through the second channel 25 with a smaller inner diameter. At this time, the resistance is large and the rotating shaft 13 rotates slowly. The inner cylinder 11 is provided with an elastic torsion assembly for resetting the rotating shaft 13. The inner wall of the lifting cylinder 10 is provided with a limit block 17. The upper end of the rotating shaft 13 is provided with an overlapping assembly for overlapping and cooperating with the limit block 17. In the initial state, the overlapping assembly and the limit block 17 are offset. The elastic torsion assembly includes an annular shell 26 installed at the top of the resistance chamber 16. The annular shell 26 is located outside the rotating shaft 13 and is movably connected to the rotating shaft 13. A first torsion spring 27 is installed between the inner wall of the annular shell 26 and the outer wall of the rotating shaft 13.

[0041] There are two implementation methods for the overlapping components:

[0042] First embodiment: as follows Figure 10 As shown, the overlapping assembly includes a square tube 20 installed on the upper side wall of the rotating shaft 13. An overlapping block 21 corresponding to the limiting block 17 is movably arranged on the inner side of the square tube 20 along the radial direction of the rotating shaft 13. A second spring 32 is arranged between one end of the overlapping block 21 and the inner wall of the square tube 20. The upper end of the overlapping block 21 is sloped. In order to reduce friction with the top of the limiting block 17, a second roller 31 is rotatably arranged at the bottom of the overlapping block 21.

[0043] Second embodiment: as follows Figure 11 As shown, the overlapping assembly includes a U-shaped shell 33 installed on the upper side wall of the rotating shaft 13. An overlapping block 21 is provided on the inner side of the U-shaped shell 33. A pin 35 is provided on the side wall of the overlapping block 21. A blind hole 37 corresponding to the pin 35 is provided on the inner wall of the U-shaped shell 33. The pin 35 is rotatably disposed inside the blind hole 37. A second torsion spring 36 is installed between the side wall of the pin 35 and the inner wall of the blind hole 37. In order to reduce friction, a second roller 31 is rotatably disposed at the end of the overlapping block 21 away from the rotating shaft 13.

[0044] In addition, such as Figures 1-2 As shown, in order to filter the water, a conical filter screen 9 is installed inside the inlet 34. To prevent the filter screen 9 from becoming clogged and affecting the water flow, the lower end of the rotating shaft 13 extends to the bottom of the filter screen 9 and is provided with a scraper 18 corresponding to the lower surface of the filter screen 9. A discharge port 5 is connected to one side of the inlet 34. A storage box 4 is detachably installed at one end of the discharge port 5. A valve 6 is installed on the discharge port 5. During normal use, the valve 6 is in the open state.

[0045] The present invention also relates to an embodiment, specifically a control method for a time-delayed self-closing water-saving valve, implemented using the aforementioned time-delayed self-closing water-saving valve, and specifically including the following steps:

[0046] Step 1: First, press button 2 to move the lifting cylinder 10 down. When the sealing ring 12 corresponds to the expansion part 14, the water in the inlet 34 enters the outlet 3 through the expansion part 14.

[0047] Step 2: After pressing button 2, with the cooperation of the limit block 17 in the delay component and the overlapping component, the lifting cylinder 10 will remain stationary for a period of time, and water will continue to flow from the outlet 3 during this stage;

[0048] Step 3: After the overlapping component separates from the limit block 17, the button 2 and the lifting cylinder 10 gradually rise and reset, the sealing ring 12 rises to seal the water outlet 3, and the water outlet 3 stops discharging water.

[0049] Working principle: In the initial state, the sealing ring 12 is located at the upper end of the expansion part 14, blocking the outlet 3. The limiting block 17 is located above the overlapping component and is offset from it. The guide block 28 is located at the upper end of the first guide groove 29. The valve 6 is in the open state. When in use, press the button 2 down. The button 2 drives the lifting cylinder 10, the sealing ring 12, and the drive cylinder frame 15 to move down as a whole. The first spring 8 contracts. When the drive cylinder frame 15 moves down, due to the obstruction of the guide block 28 on one side of the ramp 40, the drive cylinder frame 15 will drive the guide block 28 to move down in the first guide groove 29. Then, the rotating shaft 13 drives the movable plate 23 to rotate in the resistance chamber 16. At this stage, the resistance chamber Hydraulic oil flows through the first channel 24 with a larger inner diameter, resulting in less resistance. When the rotating shaft 13 rotates, it also twists the first torsion spring 27. Simultaneously, the rotating shaft 13 drives the overlapping assembly to rotate. When the overlapping assembly is directly below the limiting block 17, the guide block 28 moves to the upper end of the second guide groove 30. At this point, the rotating shaft 13 stops rotating, and the lifting cylinder 10 continues to move downwards. The guide block 28 moves downwards in the second guide groove 30, while the overlapping assembly contracts or flips under the pressure of the limiting block 17. When the overlapping assembly reaches above the limiting block 17, it resets and overlaps on top of the limiting block 17. At this point, the pressing ends, and the overlapping assembly and the limiting block 17 form a limit, preventing the lifting cylinder 10 from resetting. When the sealing ring 12 corresponds to the expansion part 14, water in the inlet 34 can enter the outlet 3 through the gap between the expansion part 14 and the sealing ring 12, allowing water to flow out of the outlet 3. During water flow, the first torsion spring 27 gradually resets, thereby driving the rotating shaft 13 to gradually reset, and the guide block 28 moves in the first reset groove 38. During this stage, the movable plate 23 resets in the resistance chamber 16. At this time, the hydraulic oil in the resistance chamber 16 flows through the second channel 25 with a smaller inner diameter, and the coarse particles are larger, so the rotating shaft 13 rotates slowly. The rotating shaft 13 drives the overlapping component to move horizontally at the top of the limiting block 17 until the overlapping component disengages from the top of the limiting block 17. At this time, the guide block 28 is located in the first reset groove 38. At the junction with the second reset groove 39, the first spring 8 then resets, which will realize the overall upward reset of the lifting cylinder 10, the drive cylinder frame 15, and the limiting block 17. During this stage, the guide block 28 moves vertically upward in the second reset groove 39, the rotating shaft 13 remains stationary, and then the sealing ring 12 resets from the expansion part 14, gradually blocking the water outlet 3. The water outlet 3 stops flowing water, and finally the guide block 28 returns to the upper end of the first guide groove 29 after passing the ramp 40. The guide block 28 will be compressed when passing the ramp 40, and then the guide block 28 will compress the elastic element 41. When the guide block 28 enters the upper end of the first guide groove 29, the elastic element 41 drives the guide block 28 to reset, so that it can wait for subsequent pressing and use.

[0050] The principles of the two embodiments of the overlapping components are as follows:

[0051] First embodiment of the overlapping component: The overlapping component of this embodiment consists of a square tube 20, an overlapping block 21, and a second spring 32. When the lifting cylinder 10 moves the limiting block 17 down, it will squeeze the upper slope of the overlapping block 21, thereby causing the overlapping block 21 to contract and compress the second spring 32. When the limiting block 17 moves down to below the overlapping block 21, the second spring 32 drives the overlapping block 21 to return to its original position and extend.

[0052] A second embodiment of the overlapping component: The overlapping component in this embodiment consists of a U-shaped shell 33, an overlapping block 21, a pin 35, a second torsion spring 36, and a blind hole 37. When the lifting cylinder 10 moves the limiting block 17 downward, it will squeeze the overlapping block 21, and then the overlapping block 21 will flip downward. The pin 35 rotates in the blind hole 37 and twists the second torsion spring 36. When the limiting block 17 moves down below the overlapping block 21, the second torsion spring 36 drives the overlapping block 21 to reset through the pin 35.

[0053] The second roller 31 rotatably disposed on the overlapping block 21 in the above two embodiments can facilitate the displacement of one end of the overlapping block 21 at the top of the limiting block 17, reducing friction. In addition, a first roller 19 is also rotatably disposed on the end edge of the limiting block 17. The first roller 19 is used to reduce the wear on the overlapping block 21 or the second roller 31 when the limiting block 17 moves down.

[0054] In addition, when the rotating shaft 13 rotates, it will also drive the scraper 18 to scrape and clean the lower surface of the filter screen 9, which can remove impurity particles. Since the filter screen 9 is conical, the impurity particles can be displaced to the outer edge of the filter screen 9. With the scraping of the scraper 18, the impurity particles can enter the impurity collection box 4 through the impurity discharge port 5 for collection, thus avoiding the filter screen 9 from being blocked and affecting the water volume. When the impurity collection box 4 is removed for subsequent processing, the valve 6 can be closed, and then the impurity collection box 4 can be removed. After reinstalling the impurity collection box 4, the valve 6 can be opened again.

[0055] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A time-delay self-closing water-saving valve, characterized in that, It includes a valve body, an outlet located on one side of the valve body, and an inlet located at the bottom of the valve body; The valve body is provided with a press-to-discharge water assembly, which includes a button located at the top of the valve body, a first spring located between the bottom of the button and the top of the valve body, a lifting cylinder movably located inside the valve body, the upper end of the lifting cylinder being installed at the bottom of the button, a sealing ring corresponding to the water outlet being provided on the lower outer wall of the lifting cylinder, and an expansion portion corresponding to the sealing ring being provided on the inner wall of the valve body. The valve body is provided with a delay component, which includes an inner cylinder installed in the inner cavity of the valve body. The upper end of the inner cylinder is movably and sealingly connected to the inner side of the lifting cylinder. A rotating shaft is rotatably installed in the inner cylinder. A drive cylinder frame that is movably sleeved with the rotating shaft is installed on the inner wall of the lifting cylinder. A guide groove assembly is provided on the outer wall of the rotating shaft. A guide block for movably cooperating with the guide groove assembly is provided on the inner wall of the drive cylinder frame. A resistance cavity is provided on the inner side of the lower end of the inner cylinder. A fixed plate is installed on one end of the inner side of the resistance cavity. A movable plate that is movably connected to the resistance cavity is provided on the lower side wall of the rotating shaft. A second channel and a first channel with different inner diameters are provided on the movable plate. A one-way valve is provided on both the second channel and the first channel. An elastic torsion assembly for resetting the rotating shaft is provided in the inner cylinder. A limit block is provided on the inner wall of the lifting cylinder. An overlapping assembly for overlapping with the limit block is provided on the upper end of the rotating shaft.

2. The time-delay self-closing water-saving valve according to claim 1, characterized in that: In the initial state, the overlapping component and the limiting block of the elastic torsion component are staggered.

3. The time-delay self-closing water-saving valve according to claim 2, characterized in that: The overlapping assembly includes a square tube installed on the upper side wall of the rotating shaft. An overlapping block corresponding to the limiting block is movably arranged on the inner side of the square tube along the radial direction of the rotating shaft. A second spring is arranged between one end of the overlapping block and the inner wall of the square tube. The upper end of the overlapping block is sloped.

4. The time-delay self-closing water-saving valve according to claim 2, characterized in that: The overlapping assembly includes a U-shaped shell installed on the upper side wall of the rotating shaft. An overlapping block is provided on the inner side of the U-shaped shell, and a pin is provided on the side wall of the overlapping block. A blind hole corresponding to the pin is provided on the inner wall of the U-shaped shell. The pin is rotatably located inside the blind hole, and a second torsion spring is installed between the side wall of the pin and the inner wall of the blind hole.

5. The time-delay self-closing water-saving valve according to claim 3 or 4, characterized in that: The guide groove assembly includes a first guide groove that is spirally disposed on the side wall of the rotating shaft, a vertical second guide groove disposed at the lower end of the first guide groove, an arc-shaped first reset groove disposed at the bottom of the second guide groove, a second reset groove that corresponds to the first guide groove is vertically disposed at the end of the first reset groove away from the second guide groove, and the upper end of the second reset groove is connected to the upper end of the first guide groove. The upper end of the second reset groove is provided with a slope corresponding to the upper end of the first guide groove. The guide block is movably connected to the inner cavity side wall of the drive cylinder frame, and one end of the guide block and the inner wall of the insertion point are provided with an elastic element.

6. The time-delay self-closing water-saving valve according to claim 3 or 4, characterized in that: The elastic torsion assembly includes an annular shell mounted on the top of the resistance chamber. The annular shell is located outside the rotating shaft and is movably connected to the rotating shaft. A first torsion spring is installed between the inner wall of the annular shell and the outer wall of the rotating shaft.

7. The time-delay self-closing water-saving valve according to claim 1, characterized in that: The inner cavity of the resistance chamber is filled with hydraulic oil.

8. The time-delay self-closing water-saving valve according to claim 1, characterized in that: A cone-shaped filter screen is installed on the inside of the water inlet.

9. The time-delay self-closing water-saving valve according to claim 8, characterized in that: The lower end of the rotating shaft extends to the bottom of the filter screen and is provided with scraper strips corresponding to the lower surface of the filter screen; A waste discharge port is connected to one side of the water inlet, and a waste storage box is detachably installed at one end of the waste discharge port. A valve is installed on the waste discharge port.

10. A control method for a time-delayed self-closing water-saving valve, implemented using the time-delayed self-closing water-saving valve according to any one of claims 1-9, characterized in that, Includes the following steps: S1: First, press the button to move the lifting cylinder down. When the sealing ring aligns with the expansion part, the water in the inlet enters the outlet through the expansion part. S2: After pressing the button, the lifting cylinder will remain stationary for a period of time due to the cooperation of the limit block in the delay component and the overlapping component, during which water will continuously flow from the outlet. S3: When the overlapping component separates from the limit block, the button and the lifting cylinder gradually rise and reset, the sealing ring rises to seal the water outlet, and the water outlet stops flowing.

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