A cushioning device for a valve

Abstract

The present application relates to the technical field of valve, especially to a buffer device for valve, comprising a valve body, a valve core and a valve seat are arranged in the valve body, a support is detachably arranged in the valve seat, a rotating frame is rotatably arranged on the support, two or more adaptive rotating shafts are arranged along the circumferential direction of the rotating frame, the adaptive rotating shafts are arranged along the radial direction of the rotating frame, the two ends of the adaptive rotating shafts are connected with a buffer vane and a swing crank respectively, a variable distance damper is detachably arranged on the rotating frame, the variable distance damper is connected with an adaptive variable distance disc, the adaptive variable distance disc is provided with a limiting track, the swing crank is slidably connected with the limiting track, and the helix angle of the buffer vane is positively correlated with the elastic force of the variable distance damper. The buffer device for valve can adaptively change the buffer resistance, solves the problem that the valve core is easily damaged when the valve is switched, and overcomes the adverse effects of the traditional buffer structure on the fluid flow rate and uniformity, thereby reducing the performance of the valve.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a buffer device for a valve. BACKGROUND

[0002] In a fluid control system, a valve is a device used to control the direction, pressure and flow of fluid (such as water flow), and its stability directly affects the operating efficiency and safety of the entire system. When the valve is opened or reversed, the fluid pressure will change dramatically, and the valve core will be subjected to a large impact force, which can cause damage to the valve core, failure of the valve seat seal, and other problems, and in severe cases, it can even affect the normal operation of the entire fluid system. To solve this problem, many ingenious valve buffer solutions have been proposed, such as the Chinese utility model patent with the publication number CN216843214U, entitled "Geothermal resource heating valve with buffer structure", or the Chinese invention patent application with the publication number CN108869868A, entitled "Valve buffer device". Although the valve buffer devices in the above-mentioned prior art can to some extent play a buffering and protecting role, they still have significant drawbacks in actual application. When the fluid pressure changes dramatically, although the damping buffer assembly can hinder the flow and reduce the flow rate, thereby reducing the impact, the damping buffer assembly still hinders the flow after the valve is opened or reversed, which affects the flow rate. The uneven scouring of the fluid on the internal structure of the valve can cause scratches, depressions or material peeling on the sealing surface, which can damage the original tight sealing performance, and further cause fluid leakage, which not only causes waste of medium, but also can cause safety hazards such as fire, explosion or personnel injury due to the leakage of high-pressure medium. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a buffer device for a valve that can adaptively change the buffer resistance, reduce the impact of fluid on the valve core when the valve is opened or reversed, and reduce uneven scouring.

[0004] To solve the above technical problems, the technical solution adopted by the present application is as follows: a buffer device for a valve, comprising a valve body, a valve core and a valve seat are arranged in the valve body, a support is detachably arranged in the valve seat, a rotating frame is rotatably arranged on the support, the rotating axis of the rotating frame is arranged along the axis of the valve seat, two or more adaptive shafts are arranged on the rotating frame in the circumferential direction, the adaptive shafts are arranged along the radial direction of the rotating frame, the two ends of the adaptive shafts are respectively connected to a buffer vane and a swing crank, a variable-distance damper is detachably arranged on the rotating frame, the elastic direction of the variable-distance damper is parallel to the rotating axis of the rotating frame, the variable-distance damper is connected to an adaptive variable-distance disc, the adaptive variable-distance disc is provided with a limiting track, the limiting track is perpendicular to the rotating axis of the rotating frame, the swing crank is slidingly connected to the limiting track, and the helix angle of the buffer vane is positively correlated with the elastic force of the variable-distance damper.

[0005] Further, the rotating frame is located on the side of the support away from the valve core, the self-adapting rotating shaft is arranged on the end face of the rotating frame close to the valve core, and the end face of the rotating frame away from the valve core is provided with an inverted conical boss.

[0006] Further, one rotating frame is arranged on each of the side close to the valve core and the side away from the valve core of the support, the two rotating frames are coaxially arranged, and the rotating directions of the buffer blades on the two rotating frames are opposite.

[0007] Further, the self-adapting variable distance disc is a ring disc, the limiting track is a strip-shaped groove arranged on the outer wall of the ring disc, two or more self-adapting rotating shafts are uniformly distributed on the rotating frame in the circumferential direction, the self-adapting variable distance disc is provided with two or more strip-shaped grooves corresponding to the swing cranks in the circumferential direction, and the swing cranks are slidably connected with the strip-shaped grooves through limiting rods.

[0008] Further, the valve seat is provided with flow guide ribs on the inner wall between the support and the valve core, the flow guide ribs are parallel to the axis of the valve seat, and two or more flow guide ribs are uniformly arranged on the inner wall of the valve seat in the circumferential direction.

[0009] Further, the inner wall of the valve seat is uniformly distributed with two or more clamping grooves in the circumferential direction, and the support is provided with two or more fulcrums which are detachably clamped with the clamping grooves.

[0010] Further, the center of the support is provided with a bearing, and the rotating frame is connected with the bearing through an elastic telescopic mounting shaft.

[0011] Further, the clamping groove comprises an insertion groove and a fixing groove, the insertion groove is parallel to the axis of the valve seat, the fixing groove is perpendicular to the insertion groove, the fulcrum is provided with a clamping block, and the clamping block is clamped with the fixing groove after being inserted into the insertion groove.

[0012] Further, the rotating frame is detachably provided with a protective cover, the protective cover covers the self-adapting variable distance disc, the variable distance damper, the swing crank and one end of the self-adapting rotating shaft, and the protective cover is provided with a through hole through which the other end of the self-adapting rotating shaft passes.

[0013] Further, the variable distance damper is a spring, and the two ends of the spring are detachably connected with the rotating frame and the self-adapting variable distance disc, respectively.

[0014] The beneficial effects of the present application are that a buffer device for a valve, the core idea is that both when the valve is opened or closed or reversed, the fluid pressure will change sharply, the buffer structure can reduce the impact of the fluid on the valve core, and at the same time, after the valve is switched, the buffer structure can reduce the resistance to the fluid to ensure the flow rate and avoid uneven erosion. Specifically, the present application is provided with a leaf buffer assembly with an adaptive angle in the valve seat, the leaf buffer assembly is detachably mounted in the valve seat through the support to facilitate maintenance or replacement of different size specifications, so as to adjust the resistance change threshold range as needed, the leaf buffer assembly includes a rotating frame, an adaptive shaft, a variable resistance damper and an adaptive variable distance disc mounted on the rotating frame, the adaptive shaft connects the buffer leaf and the adaptive variable distance disc, in the closed state of the valve, the pressure applied by the fluid to the buffer leaf is small, at this time the helix angle of the buffer leaf is the smallest, that is, the buffer leaf tends to be perpendicular to the axis of the valve seat in the closed state, when the valve is switched, the fluid pressure increases sharply, the pressure applied by the fluid to the buffer leaf becomes larger, at this time the buffer leaf is impacted while the helix angle gradually increases, that is, gradually tends to be parallel to the axis of the valve seat in the open state, during this process, the buffer leaf rotates under the impact, which can greatly unload the impact force of the fluid, thereby avoiding damage to the valve core, and as the buffer leaf gradually opens the angle, the adaptive shaft drives the swing crank to rotate synchronously, the adaptive variable distance disc is relatively displaced with the rotating frame under the relative constraint of the swing crank and the limiting rail, so that the elastic force of the variable resistance damper in the opposite displacement direction gradually increases, the force of the variable resistance damper acting on the buffer leaf can be used for buffering and is also conducive to maintaining the stability of the angle of the buffer leaf. Since two or more adaptive shafts are connected to one adaptive variable distance disc, the force transmitted to each buffer leaf by the variable resistance damper through the adaptive variable distance disc is the same, and the turning angle of the buffer leaf is consistent. When the valve switching is completed, the fluid pressure tends to be stable, at this time the turning angle of the buffer leaf is opened to the maximum, the rotating speed of the rotating frame is reduced to the minimum, the fluid flow rate is stable and uniform, thereby avoiding affecting the fluid flow rate, and the uneven erosion of the fluid to the internal structure of the valve causing scratches, depressions or material peeling on the sealing surface, damaging the original tight sealing performance, and further causing medium waste, even causing safety hazards such as fire, explosion or personnel injury. The present application solves the problem of damage to the valve core when the valve is switched by designing a buffer device for a valve that can adaptively change the buffer resistance, and overcomes the disadvantage of the traditional buffer structure that affects the fluid flow rate and uniformity, thereby reducing the performance of the valve. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Structure diagram of the buffer device for a valve of embodiment one;

[0016] Figure 2 Exploded view of the buffer device for a valve of embodiment one;

[0017] Figure 3 Sectional view of the buffer device for valve of Example 1;

[0018] Figure 4 Structure diagram of the rotating frame of Example 1;

[0019] Figure 5 Side view of the rotating frame of Example 1;

[0020] Figure 6 Exploded view of the rotating frame of Example 1;

[0021] Figure 7 Exploded view of the buffer device for valve of Example 2;

[0022] Figure 8 Sectional view of the buffer device for valve of Example 2;

[0023] Figure 9 Exploded view of the rotating frame of Example 2;

[0024] Figure 10 Side view of the rotating frame of Example 2;

[0025] Label explanation:

[0026] 1, valve body; 2, valve core; 3, valve seat; 31, clamping groove; 311, insertion groove; 312, fixing groove; 32, flow guide rib; 4, support; 41, bearing; 42, elastic telescopic mounting shaft; 5, rotating frame; 51, self-adaptive rotating shaft; 52, buffer blade; 53, swing crank; 531, limiting rod; 54, variable-pitch damper; 55, inverted conical boss; 56, protective cover; 561, through hole; 6, self-adaptive variable-pitch disc; 61, limiting track; 7, valve rod. DETAILED DESCRIPTION

[0027] To explain the technical content, achieved purposes and effects of the present application in detail, the following will be explained in combination with the embodiments and the accompanying drawings.

[0028] The core idea of the buffer device for valve of the present application is that when the valve is opened or closed or reversed, and the fluid pressure changes sharply, the buffer structure can reduce the impact of the fluid on the valve core, and after the valve is switched, the buffer structure can reduce the obstruction to the fluid to ensure the flow rate and avoid uneven scouring.

[0029] Please refer to Figures 1 to 10The application discloses a buffer device for a valve, which comprises a valve body 1, a valve core 2 and a valve seat 3 arranged in the valve body 1, a support 4 arranged in the valve seat 3 in a detachable mode, a rotating frame 5 rotatably arranged on the support 4, a rotating axis of the rotating frame 5 arranged along an axis of the valve seat 3, two or more self-adapting rotating shafts 51 arranged along a radial direction of the rotating frame 5, the self-adapting rotating shafts 51 connected with a buffer vane 52 and a swing crank 53 at two ends respectively, a variable-distance damper 54 arranged on the rotating frame 5 in a detachable mode, an elastic force direction of the variable-distance damper 54 parallel to the rotating axis of the rotating frame 5, the variable-distance damper 54 connected with a self-adapting variable-distance disc 6, the self-adapting variable-distance disc 6 provided with a limiting track 61, the limiting track 61 perpendicular to the rotating axis of the rotating frame 5, the swing crank 53 slidably connected with the limiting track 61, and a helix angle of the buffer vane 52 positively correlated with the elastic force of the variable-distance damper 54.

[0030] From the above description, the beneficial effects of the present application are that the valve seat 3 is provided with a leaf buffer assembly with an adaptive angle, the leaf buffer assembly is detachably installed in the valve seat 3 through the support 4, so that different size specifications can be conveniently maintained or replaced, and the resistance change threshold range can be adjusted as needed, the leaf buffer assembly includes a rotating frame 5, an adaptive shaft 51, a variable distance damper 54 and an adaptive variable distance disc 6 installed on the rotating frame 5, the adaptive shaft 51 connects the buffer leaf 52 and the adaptive variable distance disc 6, in the valve closed state, the pressure applied to the buffer leaf 52 by the fluid is small, at this time the helix angle of the buffer leaf 52 is the smallest, that is, the buffer leaf 52 tends to be in a closed state perpendicular to the axis of the valve seat 3, when the valve switches, the fluid pressure increases sharply, the pressure applied to the buffer leaf 52 by the fluid becomes larger, at this time the buffer leaf 52 gradually increases the helix angle while buffering the impact of the fluid, that is, gradually tends to be in an open state parallel to the axis of the valve seat 3, in this process, the buffer leaf 52 rotates under the impact, which can greatly unload the impact force of the fluid, thereby avoiding damage to the valve core 2, and at the same time, as the opening angle of the buffer leaf 52 gradually increases, the adaptive shaft 51 drives the swing crank 53 to rotate synchronously, the adaptive variable distance disc 6 is relatively displaced with the rotating frame 5 under the relative constraint of the swing crank 53 and the limiting rail 61, so that the elastic force of the variable distance damper 54 in the opposite displacement direction gradually increases, the force of the variable distance damper 54 acting on the buffer leaf 52 can be used for buffering and is also conducive to maintaining the angle stability of the buffer leaf 52, since two or more adaptive shafts 51 are commonly connected to an adaptive variable distance disc 6, the force transmitted to each buffer leaf 52 by the variable distance damper 54 through the adaptive variable distance disc 6 is the same, and the overturning angle of the buffer leaf 52 is consistent, when the valve switching is completed, the fluid pressure tends to be stable, at this time the overturning angle of the buffer leaf 52 is opened to the maximum, the rotating speed of the rotating frame 5 is reduced to the minimum, the fluid flow rate is stable and uniform, thereby avoiding affecting the fluid flow rate, and the uneven scouring of the fluid to the internal structure of the valve causing scratches, depressions or material peeling on the sealing surface, which destroys the original tight sealing performance, and further causes fluid leakage, medium waste, and even safety hazards such as fire, explosion or personnel injury.

[0031] In view of the use environment, the present application provides a single-sided leaf buffer assembly and a double-sided leaf buffer assembly to meet the use requirements of different media and different working conditions.

[0032] In an optional embodiment, the rotating frame 5 is located on the side of the support 4 away from the valve core 2, the adaptive shaft 51 is arranged on the end face of the rotating frame 5 close to the valve core 2, and a reverse tapered boss 55 is arranged on the end face of the rotating frame 5 away from the valve core 2.

[0033] From the above description, when the single-side blade buffering type is adopted, the side of the rotating frame 5 facing the fluid flow direction is designed as a conical surface, and the rotating frame 5 is installed on the side of the rotating frame 5 facing away from the fluid flow direction. The fluid first passes through the inverted conical boss 55 to be uniformly distributed, and then is buffered by the buffering blade 52. In this way, the fluid with more uniform pressure can be quickly and completely buffered, the buffering effect on the fluid is improved, the performance of the valve is prevented from being reduced due to uneven washing of the fluid on the internal structure of the valve, the stress uniformity of the blade buffering assembly components is improved, damage is avoided, and the service life of the device is prolonged.

[0034] In an optional embodiment, one rotating frame 5 is arranged on each side of the support 4 close to and away from the valve core 2. The two rotating frames 5 are coaxially arranged, and the rotation directions of the buffering blades 52 on the two rotating frames 5 are opposite.

[0035] From the above description, when the double-side blade buffering type is adopted, a set of blade buffering assemblies is arranged on each side of the support 4 in the axial direction and coaxially installed. Compared with the single-side blade buffering type, on the one hand, the torque can be balanced and the stability can be enhanced, and on the other hand, the energy generated by the tangential fluid can be fully utilized to ensure the stability and uniformity of the fluid velocity and pressure after the valve changes direction. When the fluid pressure in the pipeline is uniform, the force of the fluid on the valve core 2 is relatively stable, the impact on the valve core 2 is small, the entire fluid system can run more stably, problems such as unstable flow caused by pressure fluctuations can be avoided, and the system operation efficiency can be improved. In addition, the buffering structures of the above two types also have the function of mixing two or more media in the fluid, which helps to improve the uniformity of the distribution of one medium in another medium and adaptively adjusts the mixing speed according to the fluid speed. Therefore, when the valve is applied in the field of chemical materials, it can play a very key role in improving quality and efficiency.

[0036] In an optional embodiment, the self-adaptive variable pitch disc 6 is a ring disc, the limiting track 61 is a strip-shaped groove arranged on the outer wall of the ring disc, and two or more self-adaptive rotating shafts 51 are uniformly distributed in the circumferential direction on the rotating frame 5. The self-adaptive variable pitch disc 6 is provided with two or more strip-shaped grooves corresponding to the swing cranks 53 in the circumferential direction, and the swing cranks 53 are slidably connected with the strip-shaped grooves through the limiting rods 531.

[0037] From the above description, the stability of the ring disc is better. When the blade is flipped, the self-adaptive rotating shaft 51 rotates and drives the swing crank 53 to rotate. The limiting rods 531 of all the swing cranks 53 slide in the strip-shaped groove to jointly drive the self-adaptive variable pitch disc 6 to move. The acting force of the variable pitch damper 54 transmitted to each buffering blade 52 through the ring disc is the same, the flipping angle of the buffering blade 52 is consistent, and the stability is improved.

[0038] In an optional embodiment, the valve seat 3 is provided with flow guide ribs 32 on the inner wall between the bracket 4 and the valve core 2, the flow guide ribs 32 are parallel to the axis of the valve seat 3, and two or more flow guide ribs 32 are evenly arranged on the inner wall of the valve seat 3 in the circumferential direction.

[0039] As can be seen from the above description, the flow guide ribs 32 have the function of shunting and guiding flow, and are located on the side of the vane buffer assembly close to the valve core 2. After the action of the vane buffer assembly, the flow guide ribs 32 guide the flow, ensuring the stability and uniformity of the flow velocity and pressure after the valve changes direction.

[0040] In an optional embodiment, the inner wall of the valve seat 3 is evenly distributed with two or more clamping grooves 31 in the circumferential direction, and the bracket 4 is provided with two or more fulcrums which are detachably clamped with the clamping grooves 31.

[0041] As can be seen from the above description, the clamping grooves 31 are designed on the inner wall of the valve seat 3 for mounting the bracket 4, and the fulcrums of the bracket 4 are embedded in the clamping grooves 31 for fixation. This can not only ensure the stability of installation and use of the vane buffer assembly, but also facilitate disassembly, maintenance or replacement of the buffer vanes 52 and the variable-damping device 54 of different sizes, so as to adjust the range of resistance change as needed.

[0042] In an optional embodiment, the center of the bracket 4 is provided with a bearing 41, and the rotating frame 5 is connected with the bearing 41 through an elastic expansion mounting shaft 42.

[0043] As can be seen from the above description, the elastic expansion mounting shaft 42 has the functions of expansion and elastic recovery, and the rotating frame 5 is mounted on the bracket 4 in this connection mode. When the fluid pressure increases sharply, the elastic expansion mounting shaft 42 is deformed under pressure, and the elastic force generated by the elastic expansion mounting shaft 42 cooperates with the buffer vane 52 to buffer the fluid, which can protect the valve core 2 and other components.

[0044] In an optional embodiment, the clamping groove 31 includes an insertion groove 311 and a fixing groove 312, the insertion groove 311 is parallel to the axis of the valve seat 3, the fixing groove 312 is perpendicular to the insertion groove 311, the fulcrum is provided with a clamping block, and the clamping block is clamped with the fixing groove 312 after being inserted into the insertion groove 311.

[0045] As can be seen from the above description, the several fulcrums of the bracket 4 are simultaneously inserted into the insertion grooves 311 along the axial direction of the valve seat 3, and after sliding to the bottom end of the insertion grooves 311, the entire bracket 4 is rotated by a certain angle, so that the clamping block of the fulcrum is clamped with the fixing groove 312. According to the design of the direction in which the clamping block is clamped into the fixing groove 312 according to the rotation direction of the vane, the bracket 4 can be prevented from being pulled out of the clamping groove 31.

[0046] In an optional embodiment, the rotating frame 5 is detachably provided with a protective cover 56, which covers the adaptive variable pitch disc 6, the variable pitch damper 54, the swing crank 53 and one end of the adaptive rotating shaft 51. The protective cover 56 is provided with a through hole 561 through which the other end of the adaptive rotating shaft 51 passes.

[0047] As can be seen from the above description, the protective cover 56 can prevent the high-pressure fluid from damaging the components of the blade buffer assembly and facilitate the overall disassembly and assembly of the blade buffer assembly on the valve.

[0048] In an optional embodiment, the variable pitch damper 54 is a spring, and the two ends of the spring are detachably connected with the rotating frame 5 and the adaptive variable pitch disc 6, respectively.

[0049] As can be seen from the above description, the spring used as the variable pitch damper 54 has the advantages of small size, easy replacement and low cost.

[0050] Please refer to Figures 1 to 6 The embodiment one of the present application is as follows: The embodiment takes a ball valve as an example. The ball valve is a commonly used valve, which relies on a rotating valve core 2 to make the valve open or close. The ball valve has the characteristics of easy opening and closing, small size and easy maintenance. The valve buffer device includes a ball valve, the ball valve is provided with the valve core 2 and the valve seat 3, the valve seat 3 is detachably provided with a support 4, and the rotating frame 5 is rotatably arranged on the support 4. In the embodiment, the rotating frame 5 is a rotating disc, and the rotating axis of the rotating frame 5 is arranged along the axis of the valve seat 3. The rotating frame 5 is provided with two or more mounting seats in the circumferential direction, each mounting seat is provided with an adaptive rotating shaft 51, the adaptive rotating shaft 51 is arranged along the radial direction of the rotating frame 5, and the two ends of the adaptive rotating shaft 51 are connected with the buffer blade 52 and the swing crank 53, respectively. The buffer blade 52 has a fan ring shape, the swing crank 53 is arranged along the radial direction of the adaptive rotating shaft 51, the rotating frame 5 is detachably provided with the variable pitch damper 54, the elastic force direction of the variable pitch damper 54 coincides with the rotating axis of the rotating frame 5, the variable pitch damper 54 is connected with the adaptive variable pitch disc 6, the adaptive variable pitch disc 6 is provided with a limiting track 61 which is perpendicular to the rotating axis of the rotating frame 5, the swing crank 53 is slidably connected with the limiting track 61, and the helix angle of the buffer blade 52 is positively correlated with the elastic force of the variable pitch damper 54, that is, the helix angle of the buffer blade 52 increases, and the elastic force of the variable pitch damper 54 also increases, the helix angle of the buffer blade 52 decreases, and the elastic force of the variable pitch damper 54 also decreases.

[0051] The rotating frame 5 is located on the side of the support 4 away from the valve core 2, the adaptive rotating shaft 51 is arranged on the end face of the rotating frame 5 close to the valve core 2, the end face of the rotating frame 5 away from the valve core 2 is provided with an inverted conical boss 55, the shape of the inverted conical boss 55 is a cone, the axis of the cone coincides with the axis of the valve seat 3. The adaptive variable distance disc 6 is an annular disc, the edge of the annular disc has an annular stand, the limiting track 61 is an arc-shaped groove arranged on the annular stand, the circumferential surface where the arc-shaped groove is located is perpendicular to the axis of the valve seat 3, two or more adaptive rotating shafts 51 are uniformly distributed on the rotating frame 5 along the circumferential direction, the adaptive variable distance disc 6 is provided with two or more strip-shaped grooves corresponding to the swing cranks 53 along the circumferential direction, the swing cranks 53 are slidably connected with the strip-shaped grooves through the limiting rods 531, the limiting rods 531 are circular rods parallel to the adaptive rotating shaft 51, and the limiting rods 531 are inserted into the strip-shaped grooves and can slide. The valve seat 3 is provided with the flow guide ribs 32 on the inner wall between the support 4 and the valve core 2, the flow guide ribs 32 are parallel to the axis of the valve seat 3, two or more flow guide ribs 32 are uniformly arranged on the inner wall of the valve seat 3 along the circumferential direction, and the surface of the flow guide rib 32 is an arc surface. The inner wall of the valve seat 3 is uniformly distributed with two or more clamping grooves 31 in the circumferential direction, the support 4 has a cross shape, and the four supporting points of the support 4 are respectively and correspondingly clamped with the four clamping grooves 31. The clamping groove 31 includes an insertion groove 311 and a fixing groove 312, the insertion groove 311 is parallel to the axis of the valve seat 3, and the fixing groove 312 is perpendicular to the insertion groove 311. The supporting point is provided with a clamping block, the clamping block is inserted into the insertion groove 311 and clamped with the fixing groove 312. The rubber pad provided on the inner wall of the fixing groove 312 can improve the assembly tightness of the clamping block, and also has the effects of reducing the vibration of the support 4, improving the stability, and enhancing the buffering capacity. The center of the support 4 is provided with a bearing 41, and the rotating frame 5 is connected with the bearing 41 through an elastic telescopic mounting shaft 42. The elastic telescopic mounting shaft 42 includes a supporting rod and a telescopic rod, the supporting rod is provided with a telescopic hole, the telescopic rod is inserted into the telescopic hole and can slide, the telescopic hole is provided with an elastic element for supporting the telescopic rod, and the elastic element is selected as a spring in the embodiment. The rotating frame 5 is detachably provided with a protective cover 56, the inner side wall of the protective cover 56 has a reinforcing rib structure, the rotating frame 5 is provided with a locking groove, the protective cover 56 is provided with a lock catch for locking with the locking groove, and the protective cover 56 is provided with a rubber sealing surface. When the lock catch is locked with the locking groove, the rubber sealing surface of the protective cover 56 abuts against the rotating frame 5 to realize sealing. The protective cover 56 covers the adaptive variable distance disc 6, the variable distance damper 54, the swing crank 53 and one end of the adaptive rotating shaft 51 inside, the protective cover 56 is provided with a through hole 561 for the other end of the adaptive rotating shaft 51 to pass through, the through hole 561 is provided with a sealing element, and the sealing element can ensure the sealing property while realizing the rotation of the adaptive rotating shaft 51. In the embodiment, the variable distance damper 54 is a spring, and the two ends of the spring can be respectively screwed or clamped with the rotating frame 5 and the adaptive variable distance disc 6 through the connecting seat, so that the pressure adjustment and quick disassembly and assembly are realized.

[0052] Please refer to Figures 7 to 10As shown, the difference between the second embodiment of the present application and the first embodiment is that one rotating frame 5 is arranged on the side close to the valve core 2 and the side away from the valve core 2 of the support 4, the two rotating frames 5 are coaxially arranged, and the rotating directions of the buffer blades 52 on the two rotating frames 5 are opposite.

[0053] Please refer to Figures 7 to 10 As shown, the third embodiment of the present application is based on the second embodiment: the shafts of the two rotating frames 5 are connected through three bevel gears, the three bevel gears are installed on the support 4, the two rotating frames 5 are coaxially fixedly connected with one bevel gear respectively, and the two bevel gears are engaged and driven through another bevel gear, so that the two rotating frames 5 can be reversely rotated at the same rotating speed. In order to facilitate the display, the mounting structure of the bevel gears in the figure is an open structure, and in fact, in order to ensure the sealing, the mounting structure of the bevel gears should be designed to be sealed to avoid damage caused by water flow impact and ensure the sealing.

[0054] Please refer to Figures 3 to 8 As shown, the fourth embodiment of the present application further comprises a valve rod 7, the valve rod 7 is deeply arranged in the valve body 1 and connected with the valve core 2, and is used for controlling the rotation of the valve core 2 to open and close.

[0055] In summary, the buffer device for valve of the present application is provided with a leaf buffer assembly with an angle that can be self-adaptively changed in the valve seat, the leaf buffer assembly is detachably installed in the valve seat through the support to facilitate the maintenance or replacement of different size specifications, so as to adjust the resistance change threshold range as needed, the leaf buffer assembly comprises a rotating frame, a self-adaptive rotating shaft, a variable-distance damper and a self-adaptive variable-distance disc installed on the rotating frame, the self-adaptive rotating shaft connects the buffer leaf and the self-adaptive variable-distance disc, in the valve closed state, the pressure applied by the fluid to the buffer leaf is small, at this time, the spiral angle of the buffer leaf is minimum, that is, the buffer leaf tends to be in the closed state perpendicular to the axis of the valve seat, when the valve switches, the fluid pressure increases sharply, the pressure applied by the fluid to the buffer leaf becomes larger, at this time, the buffer leaf gradually increases the spiral angle while being impacted by the buffer fluid, that is, gradually tends to be in the open state parallel to the axis of the valve seat, in this process, the buffer leaf rotates under the impact of the buffer fluid, which can greatly unload the impact force of the fluid, thereby avoiding damage to the valve core, at the same time, as the buffer leaf gradually opens the angle, the self-adaptive rotating shaft drives the swing crank to rotate synchronously, the self-adaptive variable-distance disc relatively displaces with the rotating frame under the relative constraint of the swing crank and the limiting rail, so that the elastic force of the variable-distance damper in the opposite displacement direction gradually increases, the force of the variable-distance damper acting on the buffer leaf can be used for buffering and is also conducive to maintaining the stability of the angle of the buffer leaf, since two or more self-adaptive rotating shafts are commonly connected to one self-adaptive variable-distance disc, therefore, the force transmitted to each buffer leaf by the variable-distance damper through the self-adaptive variable-distance disc is the same, and the overturning angle of the buffer leaf is consistent, when the valve switching is completed, the fluid pressure tends to be stable, at this time, the overturning angle of the buffer leaf is opened to the maximum, the rotating speed of the rotating frame is reduced to the minimum, the fluid flow rate is stable and uniform, thereby avoiding affecting the fluid flow rate, and the uneven scouring of the fluid to the internal structure of the valve causing scratches, depressions or material peeling on the sealing surface, which destroys the originally tight sealing performance, and further causes fluid leakage, medium waste, and even safety hazards such as fire, explosion or personnel injury. The present application designs a buffer device for valve with self-adaptive changeable buffer resistance, through the cooperative action of the self-adaptive rotating shaft, the variable-distance damper and the self-adaptive variable-distance disc, the buffer resistance is self-adaptively adjusted, the problem of easy damage to the valve core when the valve switches is solved, and the disadvantage of the traditional buffer structure affecting the fluid flow rate and uniformity to reduce the performance of the valve is overcome.

[0056] The above description is only an embodiment of the present application, and does not limit the patent scope of the present application, any equivalent transformation or direct or indirect application in related technical fields based on the content of the specification and drawings of the present application are also included in the patent protection scope of the present application.

Claims

1. A cushioning device for a valve, comprising a valve body in which a valve core and a valve seat are provided, characterized in that, The valve seat is detachably provided with a support, the support is rotatably provided with a rotating frame, the rotating axis of the rotating frame is arranged along the axis of the valve seat, the rotating frame is provided with two or more adaptive rotating shafts in the circumferential direction, the adaptive rotating shafts are arranged along the radial direction of the rotating frame, the two ends of the adaptive rotating shafts are respectively connected with a buffering vane and a swing crank, the rotating frame is detachably provided with a variable distance damper, the elastic direction of the variable distance damper is parallel to the rotating axis of the rotating frame, the variable distance damper is connected with an adaptive variable distance disc, the adaptive variable distance disc is provided with a limiting track, the limiting track is perpendicular to the rotating axis of the rotating frame, the swing crank is slidably connected with the limiting track, and the helix angle of the buffering vane is positively correlated with the elasticity of the variable distance damper. The support is provided with one rotating frame on the side close to the valve core and one rotating frame on the side away from the valve core, the two rotating frames are coaxially arranged, the rotating directions of the buffering vanes on the two rotating frames are opposite, the shafts of the two rotating frames are connected through three bevel gears, the three bevel gears are all mounted on the support, and the two rotating frames are coaxially and fixedly connected with one bevel gear and then connected through the remaining bevel gear for transmission. The adaptive variable distance disc is an annular disc, the limiting track is a strip-shaped groove arranged on the outer wall of the annular disc, the two or more adaptive rotating shafts are uniformly distributed on the rotating frame in the circumferential direction, the adaptive variable distance disc is provided with two or more strip-shaped grooves corresponding to the swing cranks in the circumferential direction, and the swing cranks are slidably connected with the strip-shaped grooves through limiting rods. The center of the support is provided with a bearing, and the rotating frame is connected with the bearing through an elastic telescopic mounting shaft.

2. The cushioning device for a valve according to claim 1, characterized in that, The valve seat is provided with flow guide ribs on the inner wall between the support and the valve core, the flow guide ribs are parallel to the axis of the valve seat, and the two or more flow guide ribs are uniformly arranged on the inner wall of the valve seat in the circumferential direction.

3. A damping device for a valve according to claim 1 or 2, characterized in that The inner wall of the valve seat is uniformly distributed with two or more clamping grooves in the circumferential direction, and the support is provided with two or more fulcrums which are detachably clamped with the clamping grooves.

4. The bumper device for a valve according to claim 3, characterized by The clamping groove comprises an insertion groove and a fixing groove, the insertion groove is parallel to the axis of the valve seat, the fixing groove is perpendicular to the insertion groove, the fulcrum is provided with a clamping block, and the clamping block is clamped with the fixing groove after being inserted into the insertion groove.

5. The bumper for a valve according to claim 1, wherein The rotating frame is detachably provided with a protective cover, the adaptive variable distance disc, the variable distance damper, the swing crank and one end of the adaptive rotating shaft are covered in the protective cover, and the protective cover is provided with a through hole through which the other end of the adaptive rotating shaft passes.

6. The bumper for a valve according to claim 1, wherein The variable distance damper is a spring, and the two ends of the spring are detachably connected with the rotating frame and the adaptive variable distance disc.

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