Cushion valve with elastic energy storage structure

Abstract

The invention provides a cushion valve with an elastic energy storage structure, and belongs to the technical field of valves, the cushion valve comprises a valve clack, a valve clack protection part, a fixed cylinder, a movable cylinder, an electric cylinder assembly, a water inlet cylinder and an elastic energy absorption assembly, the end, away from the valve clack, of the fixed cylinder extends into the movable cylinder, and the end, away from the fixed cylinder, of the movable cylinder extends into the water inlet cylinder; a limiting check ring is arranged in the water inlet cylinder, a buffer cylinder is arranged on the side face of the water inlet cylinder, the elastic energy absorption assembly comprises an elastic element mounting disc, a compression assembly and a piston ring, the compression assembly is arranged in the buffer cylinder, the piston ring is arranged at the top of the compression assembly, and the elastic element mounting disc is arranged at the bottom of the compression assembly. And the elastic element mounting disc is connected with the buffer cylinder through a bolt. Graded buffering is adopted, energy of water hammers with different strengths is effectively absorbed, self-adaptive protection on the water hammers with different strengths is achieved, the safety and reliability of a whole fluid conveying system are remarkably improved, and the service life of equipment is prolonged.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of valves, and particularly relates to a buffer valve with an elastic energy storage structure. BACKGROUND

[0002] A valve is a key control component in a fluid conveying system, and is used for adjusting the flow, pressure and flow direction of a medium. The core component of the valve is a valve disc which controls the opening and closing or flow size of the fluid by moving or rotating. In the case of abnormality of the valve, the valve disc usually needs to be quickly closed to prevent backflow of the medium. The prior art usually provides a valve disc protection part at the rear end of the valve disc. When an abnormal situation occurs, a signal is fed back to a control system, and the control system rapidly starts the valve disc protection part to press the valve disc. However, when the valve is abnormally closed, water hammer effect occurs. The rapid closing action aggravates the water hammer effect, and further increases the impact on the valve disc.

[0003] According to the search of patent literature CN215763615U, a valve with a buffering function is disclosed, which comprises a valve body and a valve disc. The top end of the valve body is provided with a valve cover. The inner wall of the valve cover is provided with a valve rod. The bottom end of the valve rod is provided with a valve disc. The inner wall of the valve disc is provided with a buffer plate. The top of the buffer plate is provided with a moving rod. The inner wall of the valve disc is provided with an installation groove which is above the buffer plate. The inner wall of the installation groove is provided with a telescopic rod. The outer wall of the telescopic rod is provided with a spring which is connected with the inner wall of the installation groove at one end. The buffer plate and the spring are installed to realize the buffering function. The valve rod is rotated, the valve disc is moved downward to stop the water flow, the impact force caused by the inertia of the water flow at the moment of stopping is impacted on the buffer plate, the moving rod is moved downward, the telescopic rods on both sides are squeezed, the force received by the telescopic rods is converted into the force of the compressed spring, so that the force caused by the water flow is offset, and the buffering effect is achieved.

[0004] The above-mentioned patent literature plays a certain buffering role on the valve disc when the water hammer effect occurs. However, the buffering device of the patent is directly installed on the valve disc, which may affect the normal movement and sealing performance of the valve disc. A single-stage spring is adopted, which cannot be self-adaptively adjusted according to the water hammer strength. Moreover, the buffering stroke of the patent may be limited, and it may not be able to provide sufficient buffering for larger water hammers. That is to say, it is difficult to balance the response speed and the buffering effect in the prior art. The protection of the valve disc usually adopts passive protection, so that the valve disc is inevitably impacted by the water hammer, thereby affecting the service life of the valve disc and the valve disc protection part. Moreover, the buffering effect of the traditional single-stage spring is limited, and it is difficult to cope with water hammer impacts of different strengths. For smaller water hammers, the single-stage spring may be too sensitive. For larger water hammers, the single-stage spring may not be able to provide sufficient buffering. SUMMARY

[0005] In view of the deficiencies of the prior art, the purpose of the present application is to provide a buffer valve with an elastic energy storage structure, which effectively solves the problem that it is difficult to balance the response speed and the buffering effect in the prior art, the protection of the valve disc is mostly passive protection, so that the valve disc is inevitably impacted by water hammer, thereby affecting the service life of the valve disc and the valve disc protection part, and the buffering effect of the traditional single-stage spring is limited, and it is difficult to cope with water hammer impact of different intensities, and for smaller water hammer, the single-stage spring may be too sensitive, and for larger water hammer, the single-stage spring may not be sufficient.

[0006] To achieve the above purpose, the present application provides the following technical scheme: a buffer valve with an elastic energy storage structure, comprising a valve disc and a valve disc protection part, further comprising a fixed cylinder, a movable cylinder, an electric cylinder assembly, a water inlet cylinder and an elastic energy absorption assembly, the end of the fixed cylinder away from the valve disc extends into the inside of the movable cylinder, the end of the movable cylinder away from the fixed cylinder extends into the inside of the water inlet cylinder, the inside of the water inlet cylinder is provided with a limiting check ring, the side of the water inlet cylinder is provided with a buffer cylinder, the elastic energy absorption assembly comprises an elastic element mounting disc, a compression assembly and a piston ring, the inside of the buffer cylinder is provided with the compression assembly, the top of the compression assembly is provided with the piston ring, and the bottom of the compression assembly is provided with the elastic element mounting disc.

[0007] As a further improved scheme of the present application, the fixed cylinder is a hollow structure, the end of the fixed cylinder close to the valve disc is provided with a flange, and the bottom of the fixed cylinder is connected with a first support.

[0008] As a further improved scheme of the present application, the end of the movable cylinder close to the fixed cylinder is connected with an extension shaft connecting plate, a first through hole is formed in the extension shaft connecting plate, the inside of the movable cylinder is provided with a plugging shaft and a plurality of first rib plates, one end of the first rib plate is connected with the plugging shaft, the other end is connected with the inner wall of the movable cylinder, and a first groove is formed between adjacent first rib plates.

[0009] As a further improved scheme of the present application, the mounting end of the electric cylinder assembly is fixedly connected with the first support, and the extension shaft end of the electric cylinder assembly is connected with the extension shaft connecting plate, when the electric cylinder assembly is stretched and contracted, the movable cylinder is driven to move in the axial direction of the fixed cylinder.

[0010] As a further improved scheme of the present application, the end of the water inlet cylinder away from the movable cylinder is provided with a flange, the bottom of the water inlet cylinder is connected with a second support, and a plurality of second through holes are formed in the buffer cylinder.

[0011] As a further improvement of the present application, a third through hole is formed in the center of the limiting baffle ring, a second rib plate is arranged on the limiting baffle ring, and a limiting groove is formed in the second rib plate, and when the second rib plate connects the limiting baffle ring and the water inlet cylinder, an annular groove is formed between adjacent second rib plates.

[0012] As a further improvement of the present application, a fourth through hole is formed in the center of the elastic element mounting disc, the elastic element mounting disc comprises an end plate and a positioning disc, the end plate and the positioning disc are fixedly connected, the end plate is connected with the buffer cylinder through bolts, and the positioning disc is sequentially provided with a first clamping groove, a second clamping groove and a third clamping groove from inside to outside.

[0013] As a further improvement of the present application, the compression assembly comprises a guide rod, a first spring, a second spring and a third spring, the first spring, the second spring and the third spring are coaxially arranged from inside to outside, the guide rod penetrates through the first spring, the second spring and the third spring, the wire diameter d1 of the first spring, the wire diameter d2 of the second spring and the wire diameter d3 of the third spring satisfy the relationship d1 < d2 < d3, and the stiffness k1 of the first spring, the stiffness k2 of the second spring and the stiffness k3 of the third spring satisfy the relationship k1 < k2 < k3.

[0014] As a further improvement of the present application, the piston ring is sequentially provided with a fourth clamping groove, a fifth clamping groove and a sixth clamping groove from inside to outside, a fifth through hole is formed in the center of the piston ring, a first sealing groove is formed in the inside of the fifth through hole, and a second sealing groove is formed in the outer periphery of the piston ring.

[0015] The present application also provides a use method of the buffer valve with the elastic energy storage structure, which comprises a normal water inlet and outlet use method S1 and a use method S2 when water hammer effect occurs.

[0016] The normal water inlet and outlet use method S1 comprises the following steps.

[0017] S11, the electric cylinder assembly is in a retracted state, the valve flap is in an open state, and water flows into the inlet of the water inlet cylinder;

[0018] S12, part of the water flows into the buffer cylinder, and the other part of the water enters the fixed cylinder through the movable cylinder;

[0019] S13, the water entering the fixed cylinder enters the designated position through the valve flap;

[0020] The use method S2 when water hammer effect occurs comprises the following steps.

[0021] S21, when water hammer effect occurs, the valve flap protection part is started to push the valve flap to quickly close.

[0022] S22, the signal of the water hammer reaction is fed back to the control system, the electric cylinder assembly is quickly extended, and the movable cylinder is driven to move along the axis direction of the fixed cylinder on the inner wall of the water inlet cylinder;

[0023] S23, when the electric cylinder assembly is completely extended, the water inlet cylinder, the limiting ring, the movable cylinder, the fixed cylinder and the valve disc form a sealed area, water cannot enter the inside of the fixed cylinder, and the valve disc is protected;

[0024] S24, the water flowing from the inlet of the water inlet cylinder completely enters the buffer cylinder, the first spring is compressed, and the piston ring is driven to move downward;

[0025] S25, the compression state of the second spring and the third spring is determined according to the pressure fluctuation of the water hammer effect;

[0026] S26, when the water hammer effect ends, the valve disc protection part is slowly opened, the valve disc is gradually opened, and the electric cylinder assembly is slowly retracted, at this time, the liquid in the buffer cylinder flows into the fixed cylinder, and the springs return to the initial state.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] (1) The buffer valve with elastic energy storage structure provided by the present application significantly improves the safety and reliability of the entire fluid conveying system, prolongs the service life of the equipment, and reduces the operation and maintenance cost caused by fault maintenance and replacement of the equipment, by the setting of the valve disc, the valve disc protection part, the fixed cylinder, the movable cylinder, the electric cylinder assembly, the elastic element mounting disc, the compression assembly and the piston ring.

[0029] (2) The buffer valve with elastic energy storage structure provided by the present application adopts hierarchical buffering, effectively absorbs water hammer energy of different intensities, and adopts three-stage springs (first spring, second spring and third spring) arranged coaxially, and the stiffness gradually increases, so that the buffer valve can realize hierarchical response according to the size of the water hammer pressure, when small water hammer effect occurs, only the first spring plays a main role to provide soft buffering, when moderate water hammer effect occurs, the first spring and the second spring jointly act to provide moderate buffering, and when large water hammer effect occurs, the three-stage springs all participate to provide strong buffering, this hierarchical buffering mechanism avoids overreaction to small water hammer, and ensures sufficient absorption of large water hammer, and realizes self-adaptive protection of water hammer of different intensities.

[0030] (3) The buffer valve with the elastic energy storage structure avoids passive impact on the valve disc, when the water hammer effect occurs, the valve disc protection part quickly closes the valve disc, and the control system instructs the electric cylinder assembly to quickly extend, drives the movable cylinder, the water inlet cylinder, the limiting stop ring, the fixed cylinder and the valve disc to form a sealing area together, a series of actions can be completed in a very short time, effectively prevent the medium from flowing back, and prevent the water hammer effect from directly impacting the valve disc.

[0031] (4) The buffer valve with the elastic energy storage structure ingeniously integrates the fixed cylinder, the movable cylinder, the buffer cylinder and the compression assembly in the valve, without the need of additional installation space, the highly integrated design is particularly suitable for occasions with limited space, and since the water hammer eliminator does not need to be separately installed, the installation process is simplified, and the installation cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a connection schematic diagram of a valve disc and a valve disc protection part in the prior art;

[0033] Figure 2 is a general structure schematic diagram of the present application;

[0034] Figure 3 is a connection diagram between the movable cylinder, the water inlet cylinder and the limiting stop ring in a normal water inlet and outlet state of the present application;

[0035] Figure 4 is a connection diagram between the movable cylinder, the water inlet cylinder and the limiting stop ring in a water hammer effect state of the present application;

[0036] Figure 5 is a structure schematic diagram of the movable cylinder of the present application;

[0037] Figure 6 is a connection schematic diagram of the water inlet cylinder and the limiting stop ring of the present application;

[0038] Figure 7 is a structure schematic diagram of the limiting stop ring of the present application;

[0039] Figure 8 is a structure schematic diagram of the elastic element mounting disc of the present application;

[0040] Figure 9 is a structure schematic diagram of the compression assembly of the present application;

[0041] Figure 10 is a structure schematic diagram of the piston ring of the present application;

[0042] Figure 11 is a structure schematic diagram of the elastic energy absorption assembly of the present application.

[0043] In the figure: 110, valve disc; 120, valve disc protection part; 200, fixed cylinder; 210, first support; 300, movable cylinder; 310, extension shaft connecting plate; 311, first through hole; 320, blocking shaft; 330, first muscle plate; 331, first groove; 400, electric cylinder assembly; 500, water inlet cylinder; 510, buffer cylinder; 511, second through hole; 520, second support; 600, limiting stop ring; 601, third through hole; 610, second muscle plate; 611, limiting groove; 612, annular groove; 700, elastic element mounting disc; 701, fourth through hole; 710, end plate; 720, positioning disc; 721, first clamping groove; 722, second clamping groove; 723, third clamping groove; 800, compression assembly; 810, guide rod; 820, first spring; 830, second spring; 840, third spring; 900, piston ring; 901, fourth clamping groove; 902, fifth clamping groove; 903, sixth clamping groove; 904, fifth through hole; 905, first sealing groove; 906, second sealing groove. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0045] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0046] It should be understood that in the description of the application, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense.

[0047] Embodiment 1: see attached Figures 1 to 11The buffer valve with elastic energy storage structure provided by the embodiment 1 comprises a valve disc 110, a valve disc protection part 120, a fixed cylinder 200, a movable cylinder 300, an electric cylinder assembly 400, a water inlet cylinder 500 and an elastic energy absorption assembly. The end of the fixed cylinder 200 away from the valve disc 110 extends into the inside of the movable cylinder 300. The end of the movable cylinder 300 away from the fixed cylinder 200 extends into the inside of the water inlet cylinder 500. The inside of the water inlet cylinder 500 is provided with a limiting baffle ring 600. The side of the water inlet cylinder 500 is provided with a buffer cylinder 510 in communication with the water inlet cylinder 500. The elastic energy absorption assembly comprises an elastic element mounting disc 700, a compression assembly 800 and a piston ring 900. The inside of the buffer cylinder 510 is provided with the compression assembly 800. The top of the compression assembly 800 is provided with the piston ring 900. The bottom of the compression assembly 800 is provided with the elastic element mounting disc 700. The elastic element mounting disc 700 is connected with the buffer cylinder 510 through bolts.

[0048] It is not difficult to understand that the valve disc 110 and the valve disc protection part 120 are both existing mature technologies. The valve disc protection part 120 can be one of a pneumatic device, an electric device or a mechanical telescopic device. The valve disc protection part 120 is usually connected with a control system. When an abnormal situation occurs in the pipeline, the valve disc 110 is quickly closed, and the valve disc protection part 120 is immediately started to block the valve disc 110 to avoid the backflow of the medium.

[0049] The fixed cylinder 200 is a hollow structure. The end of the fixed cylinder 200 close to the valve disc 110 is provided with a flange. The bottom of the fixed cylinder 200 is connected with a first support 210.

[0050] The end of the movable cylinder 300 close to the fixed cylinder 200 is connected with an extension shaft connecting plate 310. The extension shaft connecting plate 310 is provided with a first through hole 311. The inside of the movable cylinder 300 is provided with a blocking shaft 320 and a plurality of first rib plates 330. One end of the first rib plate 330 is connected with the blocking shaft 320. The other end of the first rib plate 330 is connected with the inner wall of the movable cylinder 300. The first recesses 331 are formed between the adjacent first rib plates 330.

[0051] The mounting end of the electric cylinder assembly 400 is fixedly connected with the first support 210. The extension shaft end of the electric cylinder assembly 400 is connected with the extension shaft connecting plate 310. When the electric cylinder assembly 400 is telescoped, the electric cylinder assembly 400 drives the movable cylinder 300 to move in the axial direction of the fixed cylinder 200. The telescoping of the electric cylinder assembly 400 is realized through the control system.

[0052] The end of the water inlet cylinder 500 away from the movable cylinder 300 is provided with a flange. The bottom of the water inlet cylinder 500 is connected with a second support 520. A plurality of second through holes 511 are formed in the buffer cylinder 510. A safety valve is arranged on the water inlet cylinder 500. The device is fixed through the joint action of the first support 210 and the second support 520.

[0053] The center of the limiting check ring 600 is provided with a third through hole 601, and the limiting check ring 600 is provided with a second rib plate 610, and the second rib plate 610 is provided with a limiting groove 611, and when the second rib plate 610 connects the limiting check ring 600 and the water inlet cylinder 500, the annular groove 612 is formed between the adjacent second rib plates 610.

[0054] The center of the elastic element mounting disc 700 is provided with a fourth through hole 701, and the elastic element mounting disc 700 comprises an end plate 710 and a positioning disc 720, and the end plate 710 and the positioning disc 720 are fixedly connected, the end plate 710 is connected with the buffer cylinder 510 through bolts, and the positioning disc 720 is sequentially provided with a first clamping groove 721, a second clamping groove 722 and a third clamping groove 723 from inside to outside.

[0055] The compression assembly 800 comprises a guide rod 810, a first spring 820, a second spring 830 and a third spring 840, the first spring 820, the second spring 830 and the third spring 840 are coaxially arranged from inside to outside, the first spring 820 is clamped with the first clamping groove 721, the second spring 830 is clamped with the second clamping groove 722, the third spring 840 is clamped with the third clamping groove 723, the guide rod 810 penetrates through the first spring 820, the second spring 830 and the third spring 840, and the line diameter d1 of the first spring 820, the line diameter d2 of the second spring 830 and the line diameter d3 of the third spring 840 satisfy the following relationship: d1 < d2 < d3, the stiffness k1 of the first spring 820, the stiffness k2 of the second spring 830 and the stiffness k3 of the third spring 840 satisfy the following relationship: k1 < k2 < k3, the length of the first spring 820 is greater than the length of the second spring 830, and the length of the second spring 830 is greater than the length of the third spring 840.

[0056] The piston ring 900 is sequentially provided with a fourth clamping groove 901, a fifth clamping groove 902 and a sixth clamping groove 903 from inside to outside, the fourth clamping groove 901 is clamped with the first spring 820, the center of the piston ring 900 is provided with a fifth through hole 904, the inside of the fifth through hole 904 is provided with a first sealing groove 905, and the outer periphery of the piston ring 900 is provided with a second sealing groove 906.

[0057] It cannot be understood that, due to the arrangement of the first sealing groove 905 and the second sealing groove 906, it is ensured that water cannot flow downward from the top of the piston ring 900, but as the water hammer effect is generated or eliminated, the piston ring 900 will move along the axis direction of the buffer cylinder 510, so the second through hole 511 is arranged on the buffer cylinder 510 as a vent hole.

[0058] The application also provides a use method of the buffer valve with the elastic energy storage structure, which comprises a normal water inlet and outlet use method S1 and a use method S2 when the water hammer effect occurs.

[0059] The normal water inlet and outlet method S1 includes the following steps:

[0060] S11, the electric cylinder assembly 400 is in a retracted state, and the valve disc 110 is in an open state, water flows from the inlet of the water inlet cylinder 500;

[0061] S12, part of the water flows into the buffer cylinder 510, and the other part of the water enters the fixed cylinder 200 through the movable cylinder 300;

[0062] S13, the water entering the fixed cylinder 200 enters the designated position through the valve disc 110;

[0063] The water hammer effect occurs when the use method S2 includes the following steps:

[0064] S21, when the water hammer effect occurs, the valve disc protection part 120 is started, and the valve disc 110 is quickly closed;

[0065] S22, the signal of the water hammer reaction is fed back to the control system, the electric cylinder assembly 400 is quickly extended, and the movable cylinder 300 is moved along the axis direction of the fixed cylinder 200 on the inner wall of the water inlet cylinder 500;

[0066] S23, when the electric cylinder assembly 400 is completely extended, the water inlet cylinder 500, the limiting ring 600, the movable cylinder 300, the fixed cylinder 200 and the valve disc 110 form a sealed area, and water cannot enter the inside of the fixed cylinder 200, forming protection for the valve disc 110;

[0067] S24, the water flowing from the inlet of the water inlet cylinder 500 completely enters the buffer cylinder 510, the first spring 820 is compressed, and the piston ring 900 is moved downward;

[0068] S25, the compression state of the second spring 830 and the third spring 840 is determined according to the pressure fluctuation of the water hammer effect;

[0069] S26, after the water hammer effect ends, slowly open the valve disc protection part 120, so that the valve disc 110 is gradually opened, and the electric cylinder assembly 400 is slowly retracted, at this time the liquid in the buffer cylinder 510 flows into the fixed cylinder 200, and each spring returns to the initial state.

[0070] It should be noted that when the small water hammer occurs, only the first spring 820 is compressed to provide soft buffering; when the moderate water hammer effect occurs, on the basis of the small water hammer, the first spring 820 is first compressed to the natural length of the second spring 830, and the first spring 820 and the second spring 830 are compressed at the same time to provide moderate buffering; when the large water hammer effect occurs, the first spring 820, the second spring 830 and the third spring 840 all participate to provide strong buffering. This staged buffering mechanism not only avoids overreaction to small water hammer, but also ensures sufficient absorption of large water hammer, achieving self-adaptive protection for water hammers of different intensities.

[0071] While embodiments of the present application have been shown and described, it is to be understood that the embodiments described are merely divergences of the principles and spirit of the present application and that numerous modifications, changes, replacements, and variations can be made thereto by those skilled in the art without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A buffer valve with an elastic energy storage structure, comprising a valve flap (110) and a valve flap protection portion (120), characterized in that: The invention also includes a fixed cylinder (200), a movable cylinder (300), an electric cylinder assembly (400), a water inlet cylinder (500) and an elastic energy absorption assembly, wherein the end of the fixed cylinder (200) away from the valve flap (110) extends into the interior of the movable cylinder (300), the end of the movable cylinder (300) away from the fixed cylinder (200) extends into the interior of the water inlet cylinder (500), a limiting retaining ring (600) is provided inside the water inlet cylinder (500), a buffer cylinder (510) is provided on the side of the water inlet cylinder (500), and the elastic energy absorption assembly includes an elastic element mounting plate (700), a compression assembly (800) and a piston ring (900), the compression assembly (800) is provided inside the buffer cylinder (510), the piston ring (900) is provided on the top of the compression assembly (800), and the elastic element mounting plate (700) is provided at the bottom of the compression assembly (800).

2. The buffer valve with elastic energy storage structure according to claim 1, characterized in that: The fixed cylinder (200) is a hollow structure. A flange is provided at one end of the fixed cylinder (200) close to the valve flap (110). The bottom of the fixed cylinder (200) is connected to a first support (210).

3. The buffer valve with elastic energy storage structure according to claim 2, characterized in that: The movable cylinder (300) is connected to an extended shaft connecting plate (310) at one end close to the fixed cylinder (200), and a first through hole (311) is provided on the extended shaft connecting plate (310). A blocking shaft (320) and a plurality of first ribs (330) are provided inside the movable cylinder (300), one end of the first rib (330) is connected to the blocking shaft (320), and the other end is connected to the inner wall of the movable cylinder (300), and a first groove (331) is formed between adjacent first ribs (330).

4. The buffer valve with elastic energy storage structure according to claim 3, characterized in that: The mounting end of the electric cylinder assembly (400) is fixedly connected to the first support (210), and the extended shaft end of the electric cylinder assembly (400) is connected to the extended shaft connecting plate (310). When the electric cylinder assembly (400) is extended or retracted, the electric cylinder assembly (400) drives the movable cylinder (300) to move in the axial direction of the fixed cylinder (200).

5. The buffer valve with elastic energy storage structure according to claim 3, characterized in that: A flange is provided at one end of the water inlet cylinder (500) away from the movable cylinder (300), a second support (520) is connected to the bottom of the water inlet cylinder (500), and a plurality of second through holes (511) are provided on the buffer cylinder (510).

6. The buffer valve with elastic energy storage structure according to claim 3, characterized in that: A third through hole (601) is provided at the center of the limit retaining ring (600), a second rib plate (610) is provided on the limit retaining ring (600), and a limit groove (611) is provided on the second rib plate (610). When the second rib plate (610) connects the limit retaining ring (600) and the water inlet cylinder (500), an annular groove (612) is formed between adjacent second rib plates (610).

7. The buffer valve with elastic energy storage structure according to claim 6, characterized in that: A fourth through hole (701) is provided at the center of the elastic element mounting plate (700). The elastic element mounting plate (700) comprises an end plate (710) and a positioning plate (720). The end plate (710) and the positioning plate (720) are fixedly connected. The end plate (710) is connected to the buffer cylinder (510) via bolts. The positioning plate (720) is provided with a first card slot (721), a second card slot (722), and a third card slot (723) in sequence from the inside to the outside.

8. The buffer valve with elastic energy storage structure according to claim 7, characterized in that: The compression assembly (800) includes a guide rod (810), a first spring (820), a second spring (830) and a third spring (840). The first spring (820), the second spring (830) and the third spring (840) are coaxially arranged from the inside to the outside. The guide rod (810) passes through the first spring (820), the second spring (830) and the third spring (840). The wire diameter d1 of the first spring (820), the wire diameter d2 of the second spring (830) and the wire diameter d3 of the third spring (840) have the following relationship: d1<d2<d3. The stiffness k1 of the first spring (820), the stiffness k2 of the second spring (830) and the stiffness k3 of the third spring (840) have the following relationship: k1<k2<k3.

9. The buffer valve with elastic energy storage structure according to claim 8, characterized in that: The piston ring (900) is provided with a fourth groove (901), a fifth groove (902) and a sixth groove (903) in sequence from the inside to the outside, a fifth through hole (904) is provided at the center of the piston ring (900), a first sealing groove (905) is provided inside the fifth through hole (904), and a second sealing groove (906) is provided on the outer periphery of the piston ring (900).

10. The method for using the buffer valve with an elastic energy storage structure according to any one of claims 1 to 9, characterized in that: The method of use includes the normal water inlet and outlet method S1 and the method of use when the water hammer effect occurs S2; The normal water inlet and outlet method S1 includes the following steps: S11, the electric cylinder assembly (400) is in a contracted state, the valve flap (110) is in an open state, and water flows in from the inlet of the water inlet cylinder (500); S12, a portion of the water flows into the buffer cylinder (510), and the other portion of the water enters the fixed cylinder (200) through the movable cylinder (300); S13, the water entering the fixed cylinder (200) enters the designated position through the valve disc (110); When the water hammer effect occurs, method S2 includes the following steps: S21, when a water hammer effect occurs, the valve flap protection unit (120) is activated to push the valve flap (110) to close quickly; S22, a signal indicating the occurrence of a water hammer reaction is fed back to the control system, and the electric cylinder assembly (400) is rapidly extended, driving the movable cylinder (300) to move along the inner wall of the water inlet cylinder (500) along the axis of the fixed cylinder (200); S23, when the electric cylinder assembly (400) is fully extended, the water inlet cylinder (500), the limit ring (600), the movable cylinder (300), the fixed cylinder (200) and the valve disc (110) form a sealed area, and water cannot enter the interior of the fixed cylinder (200), thereby protecting the valve disc (110); S24, water flowing in from the inlet of the water inlet cylinder (500) completely enters the buffer cylinder (510), the first spring (820) is compressed, and the piston ring (900) moves downward; S25, determining the compression conditions of the second spring (830) and the third spring (840) according to the pressure fluctuation of the water hammer effect; S26, when the water hammer effect ends, the valve flap protection part (120) is slowly opened to gradually open the valve flap (110) and slowly contract the electric cylinder assembly (400). At this time, the liquid in the buffer cylinder (510) flows into the fixed cylinder (200), and each spring returns to its initial state.

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