Mechanical cutoff self-closing valve

Abstract

The invention belongs to the field of safety valves, and discloses a mechanical cutoff self-closing valve which comprises a rectangular shell, a variable-speed water pipe device is fixedly connected to the interior of the rectangular shell, and a pulse water flow manufacturing mechanism is fixedly connected to the interior of the variable-speed water pipe device; the pulse water flow manufacturing mechanism comprises a first water wheel, and the end face of an output shaft of the first water wheel is fixedly connected with an axial reciprocating motion conversion device. The axial reciprocating motion conversion device comprises a first reciprocating motion conversion device, and the end, away from the first water wheel, of the first reciprocating motion conversion device is slidably connected with a first reciprocating motion rod. Impurities attached to the interior of the mechanical cut-off self-closing valve can be reduced through the pulse water flow manufacturing mechanism, the corrosion risk is reduced, the interior of the mechanical cut-off self-closing valve can be continuously scoured through constant water flow, abrasion of the interior of the mechanical cut-off self-closing valve can be accelerated through scouring, and the pulse water flow is intermittent.

Description

Technical Field

[0001] The present invention relates to the technical field of safety valves, in particular to a mechanical flow-blocking self-closing valve. Background Art

[0002] Most tap water valves used in public places and homes are of an older design. For example, globe valves shut off the water flow by rotating the valve core to press the rubber seal against the valve outlet, while ball valves shut off the water flow by rotating the valve core to change the position of the valve opening. These valves require manual operation to open and close and lack the ability to automatically shut off the water flow.

[0003] The patent application with application number CN201920725756.0 discloses a mechanical shut-off self-closing valve, which includes a lower shell, two auxiliary spring telescopic doors, a camshaft, a reset handle, a main spring telescopic door, a spring telescopic rod, a rotating shaft, an upper shell, a fluid inlet, and a fluid outlet; when the flow of coal gas, natural gas, tap water, etc. is cut off, the elastic force of the telescopic spring rod causes the spring telescopic door to pass the highest position of the camshaft bump.

[0004] The current mechanical shut-off self-closing valve has a simple structure, is purely mechanical and does not require power, is energy-saving and environmentally friendly, is easy to clean and maintain, and the location of the fluid inlet and outlet is not restricted, which improves the applicability of the water shut-off self-closing valve and is suitable for industrial promotion. However, the mechanical shut-off self-closing valve still needs improvement in terms of extending its service life. In view of this, the test device is improved. Summary of the Invention

[0005] The object of the present invention is to provide a mechanical shut-off self-closing valve to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a mechanical flow-stopping self-closing valve, comprising a rectangular housing, a variable-speed water pipe device fixedly connected to the interior of the rectangular housing, and a pulse water flow generating mechanism fixedly connected to the interior of the variable-speed water pipe device; The pulse water flow generating mechanism comprises a first water wheel, and an axial reciprocating motion conversion device is fixedly connected to the end face of the output shaft of the first water wheel; The axial reciprocating motion conversion device includes a first reciprocating motion conversion device, the end of the first reciprocating motion conversion device away from the first water wheel is slidingly connected to the first reciprocating rod, the end of the first reciprocating rod away from the first reciprocating motion conversion device is movably connected to the first lever device, the end of the first lever device away from the first reciprocating rod is movably connected to the second reciprocating rod, and the end of the second reciprocating rod away from the first lever device is fixedly connected to the first moving block.

[0007] Preferably, the first water wheel is located inside the speed-changing water pipe device, the first water wheel output shaft is a double-ended output shaft, both of the double-ended output shafts of the first water wheel are rotatably connected to the inner wall of the speed-changing water pipe device, and there are two axial reciprocating motion conversion devices, which are respectively located at both ends of the double-ended output shaft of the first water wheel.

[0008] Preferably, the first reciprocating rod reciprocates along the axis of the first water wheel, the axis of the first reciprocating rod coincides with the axis of the output shaft of the first water wheel, the axis of the fixed rod of the first lever device is parallel to the axis of the first reciprocating rod, the lever arms at both ends of the first lever device are inconsistent, the lever arm of the first lever device close to the end of the first reciprocating rod is longer, the fixed rod of the first lever device is fixedly connected to the rectangular housing, and the end of the first moving block away from the second reciprocating rod is an arc-shaped surface.

[0009] Preferably, the speed-changing water pipe device includes a first water pipe, and a first arc-shaped side baffle is fixedly connected to the interior of the first water pipe. The number of the first arc-shaped side baffles is two and they are symmetrical along the axis of the first water pipe.

[0010] Preferably, the plane of the first arc-shaped side baffle is parallel to the axis of the first water pipe, the first movable block is located inside the first arc-shaped side baffle, the first movable block is slidingly connected to the first arc-shaped side baffle, the first water wheel is located between the two first arc-shaped side baffles, the output shafts at both ends of the first water wheel are rotatably connected to the first arc-shaped side baffles, and the bottom surface of the rectangular shell is fixedly connected to an automatic closing device.

[0011] Preferably, the automatic closing device includes a first shell, a second lever device is arranged inside the first shell, the second lever device is movably connected to a third reciprocating rod at one end away from the axial reciprocating motion conversion device, the top of the third reciprocating rod is fixedly connected to a closing plate, the second lever device is fixedly connected to a fourth reciprocating rod at one end close to the axial reciprocating motion conversion device, the top of the fourth reciprocating rod is fixedly connected to a compression spring, the top of the compression spring is fixedly connected to a pressure plate, and the bottom of the pressure plate is fixedly connected to a hinge.

[0012] Preferably, the first shell is fixedly connected to the outer surface of the rectangular shell, the fixed rod of the second lever device is fixedly connected to the bottom of the rectangular shell, the third reciprocating rod is slidably connected to the bottom of the rectangular shell, the third reciprocating rod is slidably connected to the wall of the first water pipe, the closing plate is slidably connected to the top of the rectangular shell, the closing plate is slidably connected to the wall of the first water pipe, the fourth reciprocating rod is slidably connected to the bottom of the rectangular shell, the fourth reciprocating rod is slidably connected to the first water pipe, and the end of the hinge away from the pressure plate is fixedly connected to the inner wall of the first water pipe.

[0013] Preferably, the bottom of the closing plate is arc-shaped, the closing plate is located between the two first arc-shaped side baffles, the pressure plate is located between the two axial reciprocating motion conversion devices, the width of the closing plate is consistent with the spacing between the two first arc-shaped side baffles, the force arms at both ends of the second lever device are inconsistent, the force arm at the end of the second lever device close to the third reciprocating rod is shorter, and the pressure plate is located at one end of the first water pipe close to the axial reciprocating motion conversion device.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This mechanical shut-off self-closing valve changes the original constant water flow into a pulsed water flow through a pulsed water flow manufacturing mechanism. The periodic pressure fluctuations of the pulsed water flow can reduce the continuous stress on the mechanical shut-off self-closing valve, providing relaxation time for the parts of the mechanical shut-off self-closing valve that are in contact with the water flow. In addition, the constant water flow is prone to cause a water hammer effect when the valve is suddenly closed or the pressure changes suddenly, causing damage to the valve or pipeline, thereby prolonging the service life of the mechanical shut-off self-closing valve.

[0015] 2. The mechanical shut-off self-closing valve can reduce impurities attached to the inside of the mechanical shut-off self-closing valve and reduce the risk of corrosion through the pulse water flow manufacturing mechanism. The constant water flow will produce a continuous flushing effect on the inside of the mechanical shut-off self-closing valve. This flushing will accelerate the wear of the mechanical shut-off self-closing valve. Since the pulse water flow is intermittent, the time that the inside of the mechanical shut-off self-closing valve is flushed by the water flow per unit time is relatively short, and the flushing intensity is also relatively low, which can effectively reduce wear and tear, thereby improving the service life of the mechanical shut-off self-closing valve.

[0016] 3. This mechanical shut-off self-closing valve uses a variable speed water pipe device to reduce the water flow space at the location of the closing plate. The reduction in the water flow space increases the flow rate of the water. The increase in the flow rate makes it more difficult for impurities to adhere to this location, thereby reducing the speed at which this location is blocked by impurities and increasing the service life of the device.

[0017] 4. The mechanical shut-off self-closing valve reduces the number of parts in direct contact with the water flow through an automatic closing device without affecting the normal operation of the mechanical shut-off self-closing valve, transfers the movable parts to the outer surface of the mechanical shut-off self-closing valve, and then wraps the exposed parts by adding an outer shell, so that it can avoid erosion by water flow and damage from the external environment, thereby improving the service life of the mechanical shut-off self-closing valve.

[0018] 5. This mechanical shut-off self-closing valve, through the cooperation of the pulse water flow manufacturing mechanism and the automatic closing device, can reduce the scouring and erosion of the water flow on the pressure plate. At the same time, through the intermittent characteristics of the pulse water flow and the compression spring, the pressure plate follows the intermittent rhythm of the pulse water flow and swings to a certain extent, avoiding the accumulation of impurities on the surface of the pressure plate and affecting the effect of the pressure plate, thereby improving the service life of the mechanical shut-off self-closing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 is a cross-sectional view of the structure of the present invention; Figure 3 It is a structural schematic diagram of the speed-changing water pipe device of the present invention; Figure 4 It is a structural schematic diagram of the pulse water flow manufacturing mechanism of the present invention; Figure 5 It is a structural schematic diagram of the axial reciprocating motion conversion device of the present invention; Figure 6 It is a structural schematic diagram of the automatic closing device of the present invention; Figure 7 It is a rear structural schematic diagram of the automatic closing device of the present invention; Figure 8 For the present invention Figure 7 An enlarged schematic diagram of .

[0020] In the figure: 1. rectangular shell; 2. speed-changing water pipe device; 201. first water pipe; 202. first arc-shaped side baffle; 3. pulse water flow generating mechanism; 301. first water wheel; 302. axial reciprocating motion conversion device; 3021. first reciprocating motion conversion device; 3022. first reciprocating motion rod; 3023. first lever device; 3024. second reciprocating motion rod; 3025. first moving block; 4. automatic closing device; 401. first shell; 402. second lever device; 403. third reciprocating motion rod; 404. closing plate; 405. fourth reciprocating motion rod; 406. compression spring; 407. pressure plate; 408. hinge. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] For example 1, please refer to Figure 1-Figure 5The present invention provides a technical solution: a mechanical shut-off self-closing valve, comprising a rectangular shell 1, a variable speed water pipe device 2 fixedly connected to the interior of the rectangular shell 1, the variable speed water pipe device 2 is used to make the water flow at different positions inside the first water pipe 201 have different flow rates, the variable speed water pipe device 2 comprises a first water pipe 201, a first arc-shaped side baffle 202 fixedly connected to the interior of the first water pipe 201, the first arc-shaped side baffle 202 is used to reduce the internal space of the first water pipe 201, increase the flow rate of the water flow, enhance the impact force of the water flow, and make the first water pipe 201 have different flow rates. The impact force on the wheel 301 is greater. At the same time, the curved edge of the first curved side baffle 202 is used to reduce the impact force on the first curved side baffle 202 in the water flow. The plane of the first curved side baffle 202 is parallel to the axis of the first water pipe 201. The first moving block 3025 is located inside the first curved side baffle 202. The first moving block 3025 is slidably connected to the first curved side baffle 202. The first water wheel 301 is located between the two first curved side baffles 202. The output shafts at both ends of the first water wheel 301 are connected to the first curved side baffles. The plate 202 is rotatably connected, the number of the first arc-shaped side baffles 202 is two and symmetrical along the axis of the first water pipe 201, and a pulse water flow manufacturing mechanism 3 is fixedly connected inside the speed-changing water pipe device 2; the pulse water flow manufacturing mechanism 3 is used to convert the constant water flow into a pulse water flow. While the pulse water flow extends the service life of the device, the pulse water flow can periodically flush the impurities deposited inside the mechanical cut-off self-closing valve, and bring the impurities out of the mechanical cut-off self-closing valve to prevent the impurities from causing the mechanical cut-off self-closing valve to be blocked or stuck. The flushing water flow generating mechanism 3 includes a first water wheel 301. The first water wheel 301 is used to absorb the impact force of the water flow and convert the impact force of the water flow into rotational power, so that the pulse water flow generating mechanism 3 can convert the constant water flow into a pulsed water flow. The first water wheel 301 is located inside the speed-changing water pipe device 2. The output shaft of the first water wheel 301 is a double-ended output shaft. Both ends of the output shaft of the first water wheel 301 are rotatably connected to the inner wall of the speed-changing water pipe device 2. The end face of the output shaft of the first water wheel 301 is fixedly connected to the axial reciprocating motion conversion device 302.The axial reciprocating motion conversion device 302 is used to convert the rotational motion force of the first water wheel 301 into the axial reciprocating motion force of the first reciprocating motion rod 3022. There are two axial reciprocating motion conversion devices 302, which are respectively located at both ends of the double-ended output shaft of the first water wheel 301. The axial reciprocating motion conversion device 302 includes a first reciprocating motion conversion device 3021. The end of the first reciprocating motion conversion device 3021 away from the first water wheel 301 is slidably connected to the first reciprocating motion rod 3022. The first reciprocating motion rod 3022 moves along the first reciprocating motion conversion device 3021. The axis of the first water wheel 301 reciprocates, and the axis of the first reciprocating rod 3022 coincides with the axis of the output shaft of the first water wheel 301. The end of the first reciprocating rod 3022 away from the first reciprocating motion conversion device 3021 is movably connected to the first lever device 3023. The first lever device 3023 is used to change the direction of the axial reciprocating force of the first reciprocating rod 3022 and amplify the effect of the axial reciprocating force of the first reciprocating rod 3022 through the lever principle. The fixed rod axis of the first lever device 3023 The first lever device 3023 has a fixed rod 3024, which is connected to the first reciprocating rod 3022. The first lever device 3023 has a fixed rod 3024, which is connected to the first reciprocating rod 3022. The first lever device 3023 has a fixed rod 3024, which is connected to the first reciprocating rod 3022. The second reciprocating rod 3024 is used to connect the first lever device 3023 and the first moving block 3025, and to move the first reciprocating rod 3025 to the first reciprocating rod 3022. The moving force at one end of a lever assembly 3023 is transmitted to a first movable block 3025. The end of a second reciprocating rod 3024, distal to the first lever assembly 3023, is fixedly connected to the first movable block 3025. The first movable block 3025 is used to convert the originally constant water flow in the first water pipe 201 into a pulsed water flow by continuously and repeatedly moving along the radial direction of the first water pipe 201. The end of the first movable block 3025, distal to the second reciprocating rod 3024, is curved. An automatic closing device 4 is fixedly connected to the bottom surface of the rectangular housing 1.

[0023] The working principle of this embodiment is as follows: when water flows inside the first water pipe 201, and when the water flows to the position between the two first curved side baffles 202, since the space between the two first curved side baffles 202 is smaller than the space inside the first water pipe 201, the flow rate of the water flow is increased when the water flows from the first water pipe 201 to the position between the first curved side baffles 202, and then the flow rate continues to flow due to the increased flow rate. During the flow process, the impact force generated by the water flow drives the first water wheel 301 located in the first water pipe 201 to rotate, and the rotating first water wheel 301 transmits the rotational force to the first reciprocating motion wheel 301 through the output shaft. The first reciprocating motion conversion device 3021 then converts the original rotational force into an axial reciprocating force through the first reciprocating motion conversion device 3021, and then the axial reciprocating force is transmitted to the first reciprocating rod 3022, and then the first reciprocating rod 3022 reciprocates along the axial direction of the first water wheel 301; the first reciprocating rod 3022 is sleeved on the part of the first reciprocating motion conversion device 3021, and a spiral guide rail is provided on its inner wall; the outer surface of the first water wheel 301 extending to the inside of the first reciprocating motion conversion device 3021 is fixedly connected with a protrusion, and the protrusion is embedded in the spiral guide rail to form a transmission fit. When the first water wheel 301 rotates, the protrusion moves along the spiral track of the spiral guide rail. Since the first reciprocating rod 3022 only forms a horizontal sliding fit with the first reciprocating motion conversion device 3021, the spiral line of the spiral guide rail forces the first reciprocating rod 3022 to rotate with the first water wheel 301 and perform reciprocating linear motion along the axial direction of the first water wheel 301; the reciprocating first reciprocating rod 3022 drives the end of the first lever device 3023 movably connected to it to perform reciprocating motion. When one end of the movable rod 3022 that is movably connected reciprocates along the axial direction of the first water wheel 301, one end of the first lever device 3023 that is movably connected to the second reciprocating rod 3024 also reciprocates along the axial direction of the first water wheel 301, and then the reciprocating second reciprocating rod 3024 drives the first moving block 3025 to reciprocate, and the reciprocating first moving block 3025 converts the flow space of the water flow between large and small. The continuous conversion of the size of the flow space converts the constant water flow into a pulsed water flow.

[0024] Example 2, based on Example 1, please refer to Figure 6-Figure 8The present invention provides a technical solution: the automatic closing device 4 includes a first shell 401, which is used to wrap some components that leave the interior of the speed-changing water pipe device 2 to prevent these components from being directly exposed to the outside world and reduce the impact of external factors on these components. The first shell 401 is fixedly connected to the outer surface of the rectangular shell 1. A second lever device 402 is provided inside the first shell 401. The second lever device 402 is used to amplify the final effect of the force of the pulse water flow while changing the direction of the force of the fourth reciprocating rod 405. Both ends of the second lever device 402 The lever arms are inconsistent. The lever arm at one end of the second lever device 402 close to the third reciprocating rod 403 is shorter. The fixed rod of the second lever device 402 is fixedly connected to the bottom of the rectangular shell 1. The end of the second lever device 402 away from the axial reciprocating motion conversion device 302 is movably connected to the third reciprocating rod 403. The third reciprocating rod 403 is slidably connected to the bottom of the rectangular shell 1. The third reciprocating rod 403 is slidably connected to the wall of the first water pipe 201. The top of the third reciprocating rod 403 is fixedly connected to a closing plate 404. The width of the closing plate 404 is the same as the width between the two first arc side baffles 202. The spacing between them is consistent, the bottom of the closing plate 404 is arc-shaped, the closing plate 404 is located between the two first arc-shaped side baffles 202, the closing plate 404 is slidably connected to the top of the rectangular shell 1, the closing plate 404 is slidably connected to the wall of the first water pipe 201, the second lever device 402 is fixedly connected to the fourth reciprocating rod 405 at one end close to the axial reciprocating motion conversion device 302, the fourth reciprocating rod 405 is slidably connected to the bottom of the rectangular shell 1, the fourth reciprocating rod 405 is slidably connected to the first water pipe 201, and the top of the fourth reciprocating rod 405 is fixedly connected to a compression spring 406. The spring 406 is used to buffer the impact force of the water flow on the pressure plate 407 and reduce the damage of the pulse water flow to the pressure plate 407. The top of the compression spring 406 is fixedly connected to the pressure plate 407. The pressure plate 407 is in the shape of a flat plate and is used to increase the assistance received in the pulse water flow. The pressure plate 407 is located at one end of the first water pipe 201 close to the axial reciprocating motion conversion device 302. The pressure plate 407 is located between the two axial reciprocating motion conversion devices 302. The bottom of the pressure plate 407 is fixedly connected to a hinge 408. The end of the hinge 408 away from the pressure plate 407 is fixedly connected to the inner wall of the first water pipe 201.

[0025] The working principle of this embodiment is as follows: the original constant water flow is converted into a pulse water flow through the pulse water flow manufacturing mechanism 3, and then the pulse water flow flows inside the first water pipe 201. When the flow rate of the pulse water flow is high, the flowing water flow generates a greater impact force on the pressure plate 407. The pressure plate 407 transmits the impact force to the compression spring 406, and then the compression spring 406 is further compressed and transmits the impact force to the fourth reciprocating rod 405. The fourth reciprocating rod 405 moves downward, driving the end of the second lever device 402 connected to the fourth reciprocating rod 405 to move downward, the end of the second lever device 402 connected to the fourth reciprocating rod 405 moves downward, causing the end of the second lever device 402 connected to the third reciprocating rod 403 to move upward, the end of the second lever device 402 connected to the third reciprocating rod 403 moves upward, driving the third reciprocating rod 403 to move upward, and then the upward-moving third reciprocating rod 403 drives the closing plate 404 to move upward. When the flow rate of the pulse water flow is low, the impact force of the flowing water on the pressure plate 407 is reduced. Therefore, the pressure on the fourth reciprocating rod 405 is reduced. Therefore, the end of the second lever device 402 connected to the third reciprocating rod 403 moves downward a distance under the influence of gravity, causing the closing plate 404 to move downward a distance. Because the end of the second lever device 402 connected to the third reciprocating rod 403 moves downward, the end of the second lever device 402 connected to the fourth reciprocating rod 405 moves upward, and the compression spring 406 rebounds, causing the pressure plate 407 to rotate a certain angle. When the water flow is cut off, the impact force of the water flow on the pressure plate 407 completely disappears, and the end of the second lever device 402 connected to the third reciprocating rod 403 moves downward under the influence of gravity until the curved surface of the closing plate 404 contacts the bottom wall of the first water pipe 201.

[0026] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A mechanical shut-off self-closing valve, comprising a rectangular housing (1), characterized in that: A speed-changing water pipe device (2) is fixedly connected to the interior of the rectangular housing (1), and a pulse water flow generating mechanism (3) is fixedly connected to the interior of the speed-changing water pipe device (2); The pulse water flow generating mechanism (3) comprises a first water wheel (301), wherein an axial reciprocating motion conversion device (302) is fixedly connected to an output shaft end surface of the first water wheel (301); The axial reciprocating motion conversion device (302) comprises a first reciprocating motion conversion device (3021), wherein one end of the first reciprocating motion conversion device (3021) away from the first water wheel (301) is slidably connected to a first reciprocating motion rod (3022), one end of the first reciprocating motion rod (3022) away from the first reciprocating motion conversion device (3021) is movably connected to a first lever device (3023), one end of the first lever device (3023) away from the first reciprocating motion rod (3022) is movably connected to a second reciprocating motion rod (3024), and one end of the second reciprocating motion rod (3024) away from the first lever device (3023) is fixedly connected to a first moving block (3025); The automatic closing device (4) comprises a first housing (401), a second lever device (402) is provided inside the first housing (401), an end of the second lever device (402) away from the axial reciprocating motion conversion device (302) is movably connected to a third reciprocating motion rod (403), the top of the third reciprocating motion rod (403) is fixedly connected to a closing plate (404), an end of the second lever device (402) close to the axial reciprocating motion conversion device (302) is fixedly connected to a fourth reciprocating motion rod (405), the top of the fourth reciprocating motion rod (405) is fixedly connected to a compression spring (406), the top of the compression spring (406) is fixedly connected to a pressure plate (407), and the bottom of the pressure plate (407) is fixedly connected to a hinge (408).

2. A mechanical shut-off self-closing valve according to claim 1, characterized in that: The first water wheel (301) is located inside the speed-changing water pipe device (2); the output shaft of the first water wheel (301) is a double-ended output shaft; both of the double-ended output shafts of the first water wheel (301) are rotatably connected to the inner wall of the speed-changing water pipe device (2); and there are two axial reciprocating motion conversion devices (302), which are respectively located at both ends of the double-ended output shaft of the first water wheel (301).

3. The mechanical shut-off self-closing valve according to claim 1, characterized in that: The first reciprocating rod (3022) reciprocates along the axis of the first water wheel (301), the axis of the first reciprocating rod (3022) coincides with the axis of the output shaft of the first water wheel (301), the axis of the fixed rod of the first lever device (3023) is parallel to the axis of the first reciprocating rod (3022), the lever arms at both ends of the first lever device (3023) are inconsistent, the lever arm at one end of the first lever device (3023) close to the first reciprocating rod (3022) is longer, the fixed rod of the first lever device (3023) is fixedly connected to the rectangular housing (1), and the end of the first moving block (3025) away from the second reciprocating rod (3024) is an arcuate surface.

4. The mechanical shut-off self-closing valve according to claim 1, characterized in that: The speed-changing water pipe device (2) comprises a first water pipe (201), wherein a first arc-shaped side baffle (202) is fixedly connected to the interior of the first water pipe (201), and the first arc-shaped side baffles (202) are two in number and are symmetrical along the axis of the first water pipe (201).

5. The mechanical shut-off self-closing valve according to claim 4, characterized in that: The plane of the first arc-shaped side baffle (202) is parallel to the axis of the first water pipe (201); the first moving block (3025) is located inside the first arc-shaped side baffle (202); the first moving block (3025) is slidably connected to the first arc-shaped side baffle (202); the first water wheel (301) is located between the two first arc-shaped side baffles (202); the output shafts at both ends of the first water wheel (301) are rotatably connected to the first arc-shaped side baffles (202); and the bottom surface of the rectangular housing (1) is fixedly connected to an automatic closing device (4).

6. A mechanical shut-off self-closing valve according to claim 5, characterized in that: The first shell (401) is fixedly connected to the outer surface of the rectangular shell (1), the fixed rod of the second lever device (402) is fixedly connected to the bottom of the rectangular shell (1), the third reciprocating rod (403) is slidably connected to the bottom of the rectangular shell (1), the third reciprocating rod (403) is slidably connected to the wall of the first water pipe (201), the closing plate (404) is slidably connected to the top of the rectangular shell (1), the closing plate (404) is slidably connected to the wall of the first water pipe (201), the fourth reciprocating rod (405) is slidably connected to the bottom of the rectangular shell (1), the fourth reciprocating rod (405) is slidably connected to the first water pipe (201), and the end of the hinge (408) away from the pressure plate (407) is fixedly connected to the inner wall of the first water pipe (201).

7. The mechanical shut-off self-closing valve according to claim 6, characterized in that: The bottom of the closing plate (404) is arc-shaped. The closing plate (404) is located between the two first arc-shaped side baffles (202). The pressure plate (407) is located between the two axial reciprocating motion conversion devices (302). The width of the closing plate (404) is consistent with the spacing between the two first arc-shaped side baffles (202). The force arms at both ends of the second lever device (402) are inconsistent. The force arm at one end of the second lever device (402) close to the third reciprocating rod (403) is shorter. The pressure plate (407) is located at one end of the first water pipe (201) close to the axial reciprocating motion conversion device (302).

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