Buffer device for valve

Abstract

The invention relates to the technical field of valves, in particular to a buffering device for a valve, which comprises 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, more than two self-adaptive rotating shafts are arranged on the rotating frame along the circumferential direction, and the self-adaptive rotating shafts are arranged along the radial direction of the rotating frame. The two ends of the self-adaptive rotating shaft are connected with the buffer blade and the swing crank respectively, the rotating frame is detachably provided with a variable-pitch damper, the variable-pitch damper is connected with the self-adaptive variable-pitch disc, the self-adaptive variable-pitch disc is provided with a limiting rail, the swing crank is in sliding connection with the limiting rail, and the spiral angle of the buffer blade is in positive correlation with the elastic force of the variable-pitch damper. According to the buffering device for the valve, by designing the buffering device capable of adaptively changing the buffering resistance and used for the valve, the problem that a valve element is prone to being damaged during valve switching is solved, and the defect that the performance of the valve is reduced due to the adverse effect of a traditional buffering structure on the flow speed and uniformity of fluid is overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a buffer device for valves. Background Art

[0002] In fluid control systems, valves are devices used to control the direction, pressure, and flow of fluids (such as water). Their operational stability directly impacts the efficiency and safety of the entire system. When a valve opens, closes, or switches direction, the fluid pressure fluctuates dramatically, subjecting the valve core to significant impact. This can cause damage to the core, seal failure, and even disrupt the normal operation of the entire fluid system. To solve this problem, the industry has proposed many ingenious valve buffering solutions, such as the Chinese utility model patent with publication number CN216843214U, entitled "Geothermal Resource Heating Valve with Buffering Structure," or the Chinese invention patent application with publication number CN108869868A, entitled "Valve Buffering Device." Although the valve buffering devices in the above-mentioned prior art can play a buffering and protective role to a certain extent, they still have major disadvantages in actual application. When the fluid pressure changes drastically, the damping buffer component can hinder the fluid and reduce the flow rate, thereby reducing the impact. However, after the valve is opened and closed or switched, the damping buffer component still has an obstructing effect on the fluid, thereby affecting the flow rate. The uneven scouring of the internal structure of the valve by the fluid will cause scratches, dents or material peeling on the sealing surface, destroying the originally tight sealing performance, and then causing fluid leakage, which will not only cause medium waste, but may also cause safety hazards such as fire, explosion or casualties due to the leakage of high-pressure medium. Summary of the Invention

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

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a buffer device for a valve, including a valve body, a valve core and a valve seat are arranged in the valve body, a bracket is detachably provided in the valve seat, a rotating frame is rotatably provided on the bracket, the rotation axis of the rotating frame is arranged along the axis of the valve seat, the rotating frame is provided with more than two adaptive rotating shafts along the circumferential direction, the adaptive rotating shaft is arranged along the radial direction of the rotating frame, the two ends of the adaptive rotating shaft are respectively connected to the buffer blade and the swing crank, the rotating frame is detachably provided with a variable pitch damper, the elastic force direction of the variable pitch damper is parallel to the rotation axis of the rotating frame, the variable pitch damper is connected to the adaptive variable pitch disk, the adaptive variable pitch disk is provided with a limiting track, the limiting track is perpendicular to the rotation axis of the rotating frame, the swing crank is slidably connected to the limiting track, and the helix angle of the buffer blade is positively correlated with the elastic force of the variable pitch damper.

[0005] Furthermore, the rotating frame is located on a side of the bracket away from the valve core, the adaptive rotating shaft is arranged on the end surface of the rotating frame close to the valve core, and an inverted conical boss is provided on the end surface of the rotating frame away from the valve core.

[0006] Furthermore, a rotating frame is provided on the side of the bracket close to the valve core and the side away from the valve core, respectively. The two rotating frames are coaxially arranged, and the rotation directions of the buffer blades on the two rotating frames are opposite.

[0007] Furthermore, the adaptive pitch-variable disk is an annular disk, the limiting track is a strip groove arranged on the outer wall of the annular disk, and two or more adaptive rotating shafts are evenly distributed along the circumferential direction on the rotating frame. The adaptive pitch-variable disk is provided with two or more strip grooves corresponding to the swing cranks one by one along the circumferential direction, and the swing crank is slidably connected to the strip groove through a limiting rod.

[0008] Furthermore, a guide rib is provided on the inner wall of the valve seat between the bracket and the valve core. The guide rib is parallel to the axis of the valve seat. Two or more guide ribs are evenly arranged along the circumferential direction on the inner wall of the valve seat.

[0009] Furthermore, the inner wall of the valve seat is provided with more than two groups of grooves evenly distributed along the circumferential direction, and the bracket is provided with more than two supporting points that are detachably connected to the grooves one by one.

[0010] Furthermore, a bearing is provided at the center of the bracket, and the rotating frame is connected to the bearing via an elastic telescopic mounting shaft.

[0011] Furthermore, the clamping slot includes an insertion slot and a fixing slot, the insertion slot is parallel to the axis of the valve seat, the fixing slot is perpendicular to the insertion slot, and a clamping block is provided at the fulcrum, which is inserted into the insertion slot and then clamped with the fixing slot.

[0012] Furthermore, a protective cover is detachably provided on the rotating frame, which covers the adaptive pitch disc, pitch damper, swing crank and one end of the adaptive rotating shaft. The protective cover is provided with a through hole for the other end of the adaptive rotating shaft to pass through.

[0013] Furthermore, the pitch variable damper is a spring, and both ends of the spring are detachably connected to the rotating frame and the adaptive pitch variable disc respectively.

[0014] The beneficial effects of the present invention are: a buffer device for a valve, the core concept of which is that when the valve is opened and closed or reversed, the fluid pressure will change drastically, 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 obstruction of the fluid to ensure the flow rate and avoid uneven flushing. Specifically, the present invention is provided with a blade buffer assembly with an adaptively changeable angle in the valve seat. The blade buffer assembly is detachably mounted in the valve seat through a bracket, thereby facilitating maintenance or replacement of different sizes and specifications to adjust the resistance change threshold range as needed. The blade buffer assembly includes a rotating frame and an adaptive rotating shaft, a variable pitch damper and an adaptive variable pitch disk mounted on the rotating frame. The adaptive rotating shaft connects the buffer blade and the adaptive variable pitch disk. When the valve is closed, the pressure applied by the fluid to the buffer blade is small. At this time, the spiral angle of the buffer blade is minimum, that is, the buffer blade 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, and the pressure applied by the fluid to the buffer blade increases. At this time, the spiral angle of the buffer blade gradually increases while buffering the fluid impact, that is, gradually tends to be parallel to the open state of the axis of the valve seat. In this process, the buffer blade is impacted and rotates, which can greatly unload the impact force of the fluid, thereby avoiding damage to the valve core. At the same time, as the buffer blade gradually opens the angle, the adaptive The rotating shaft drives the swing crank to rotate synchronously, and the adaptive pitch disc undergoes relative displacement with the rotating frame under the relative constraints of the swing crank and the limit track, so that the elastic force of the pitch damper in the opposite displacement direction gradually increases. The force of the pitch damper acting on the buffer blade can be used for buffering and is also conducive to maintaining the stability of the buffer blade angle. Since more than two adaptive rotating shafts are connected to an adaptive pitch disc, the force transmitted to each buffer blade by the pitch damper through the adaptive pitch disc is the same, and the flipping angle of the buffer blade is consistent. When the valve switching is completed, the fluid pressure tends to stabilize. At this time, the flipping angle of the buffer blade is opened to the maximum, the rotation speed of the rotating frame is reduced to the minimum, and the fluid flow rate is stable and uniform, thereby avoiding affecting the fluid flow rate, and the uneven scouring of the internal structure of the valve by the fluid, resulting in scratches, dents or material peeling on the sealing surface, destroying the originally tight sealing performance, and then causing fluid leakage, resulting in medium waste and even safety hazards, such as fire, explosion or casualties. The present invention solves the problem of the valve core being easily damaged when the valve is switched by designing a buffer device for the valve that can adaptively change the buffer resistance, and overcomes the disadvantage that the traditional buffer structure has an adverse effect on the fluid flow rate and uniformity, resulting in reduced valve performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of a buffer device for a valve according to Example 1; Figure 2 This is an exploded view of the buffer device for a valve according to the first embodiment; Figure 3 is a cross-sectional view of a buffer device for a valve according to embodiment 1; Figure 4 Schematic diagram of the structure of the rotating frame of Example 1; Figure 5 It is a side view of the rotating frame of the first embodiment; Figure 6 This is an exploded view of the rotating frame of Example 1; Figure 7 This is an exploded view of a buffer device for a valve according to the second embodiment; Figure 8 is a cross-sectional view of a buffer device for a valve according to a second embodiment; Figure 9 This is an exploded view of the rotating frame of Example 2; Figure 10 It is a side view of the rotating frame of the second embodiment; Description of labels: 1. Valve body; 2. Valve core; 3. Valve seat; 31. Slot; 311. Insert slot; 312. Fixing slot; 32. Guide rib; 4. Bracket; 41. Bearing; 42. Elastic telescopic mounting shaft; 5. Rotating frame; 51. Adaptive rotating shaft; 52. Buffer blade; 53. Swing crank; 531. Limit rod; 54. Pitch damper; 55. Inverted conical boss; 56. Protective cover; 561. Through hole; 6. Adaptive pitch disc; 61. Limit track; 7. Valve stem. DETAILED DESCRIPTION

[0016] To illustrate the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and accompanying drawings.

[0017] The core concept of the buffer device for valves of the present invention is that when the valve is opened and closed or switched, and the fluid pressure changes drastically, 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 obstruction of the fluid to ensure the flow rate and avoid uneven flushing.

[0018] Please refer to Figures 1 to 10As shown, a buffer device for a valve of the present invention includes a valve body 1, a valve core 2 and a valve seat 3 are provided in the valve body 1, a bracket 4 is detachably provided in the valve seat 3, a rotating frame 5 is rotatably provided on the bracket 4, the rotation 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 adaptive rotating shafts 51 along the circumferential direction, 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 respectively connected to the buffer blade 52 and the swing crank 53, the rotating frame 5 is detachably provided with a variable pitch damper 54, the elastic force direction of the variable pitch damper 54 is parallel to the rotation axis of the rotating frame 5, the variable pitch damper 54 is connected to the adaptive variable pitch disk 6, the adaptive variable pitch disk 6 is provided with a limiting rail 61, the limiting rail 61 is perpendicular to the rotation axis of the rotating frame 5, the swing crank 53 is slidably connected to the limiting rail 61, and the helix angle of the buffer blade 52 is positively correlated with the elastic force of the variable pitch damper 54.

[0019] As can be seen from the above description, the beneficial effects of the present invention are as follows: a blade buffer assembly with an adaptively variable angle is provided in the valve seat 3, and the blade buffer assembly is detachably mounted in the valve seat 3 through the bracket 4, thereby facilitating maintenance or replacement of different sizes and specifications, so as to adjust the resistance change threshold range as needed. The blade buffer assembly includes a rotating frame 5 and an adaptive rotating shaft 51, a variable pitch damper 54 and an adaptive variable pitch disc 6 mounted on the rotating frame 5. The adaptive rotating shaft 51 connects the buffer blade 52 and the adaptive variable pitch disc 6. In the valve closed state, the pressure applied by the fluid to the buffer blade 52 is small. At this time, the spiral angle of the buffer blade 52 is the smallest, that is, the buffer blade 52 tends to be perpendicular to the axis of the valve seat 3 in the closed state. When the valve is switched, the fluid pressure increases sharply, and the pressure applied by the fluid to the buffer blade 52 increases. At this time, the spiral angle of the buffer blade 52 gradually increases while buffering the fluid impact, that is, gradually tends to be parallel to the axis of the valve seat 3 in the open state. In this process, the buffer blade 52 is impacted and rotates, which can greatly relieve the impact force of the fluid, thereby avoiding damage to the valve core 2. At the same time, as the buffer blade 52 gradually opens The adaptive rotating shaft 51 drives the swing crank 53 to rotate synchronously. The adaptive pitch disc 6 is relatively displaced with the rotating frame 5 under the relative constraint of the swing crank 53 and the limiting track 61, so that the elastic force of the pitch damper 54 in the opposite displacement direction gradually increases. The force of the pitch damper 54 reacting on the buffer blade 52 can be used for buffering and is also conducive to maintaining the angle stability of the buffer blade 52. Since more than two adaptive rotating shafts 51 are commonly connected to one adaptive pitch disc 6, the pitch damper 54 is transmitted to the adaptive pitch disc 6 through the adaptive pitch disc 6. The acting force of each buffer blade 52 is the same, and the flip angle of the buffer blade 52 is consistent. When the valve switching is completed, the fluid pressure tends to be stable. At this time, the flip angle of the buffer blade 52 is opened to the maximum, and the rotation 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 fluid unevenly scouring the internal structure of the valve, causing scratches, dents or material peeling on the sealing surface, destroying the originally tight sealing performance, and then causing fluid leakage, resulting in medium waste and even safety hazards, such as fire, explosion or casualties.

[0020] In response to the needs of the use environment, the present invention provides two types of buffer devices: a single-sided blade buffer assembly and a double-sided blade buffer assembly, so as to meet the use requirements of different media and different working conditions.

[0021] In an optional embodiment, the rotating frame 5 is located on the side of the bracket 4 away from the valve core 2, the adaptive rotating shaft 51 is provided on the end surface of the rotating frame 5 close to the valve core 2, and an inverted conical boss 55 is provided on the end surface of the rotating frame 5 away from the valve core 2.

[0022] From the above description, it can be seen that when a single-sided blade buffer type is adopted, the side of the rotating frame 5 facing the direction of the fluid is designed to be a conical surface, and then the rotating frame 5 is installed on the side of the rotating frame 5 facing away from the direction of the fluid. The fluid is first evenly distributed through the inverted conical boss 55, and then buffered by the buffer blade 52. In this way, the fluid with more uniform pressure can be buffered quickly and completely, thereby improving the buffering effect on the fluid, and avoiding the uneven scouring of the internal structure of the valve by the fluid, resulting in a decrease in valve performance. At the same time, it can also improve the force uniformity of the blade buffer component parts, avoid damage, and extend the service life of the device.

[0023] In an optional embodiment, a rotating frame 5 is provided on the side of the bracket 4 close to the valve core 2 and the side away from the valve core 2 , respectively. The two rotating frames 5 are coaxially arranged, and the buffer blades 52 on the two rotating frames 5 rotate in opposite directions.

[0024] From the above description, it can be seen that when the double-sided blade buffer type is adopted, a set of blade buffer components is provided on both axial sides of the bracket 4 and installed coaxially. Compared with the single-sided blade buffer type, it can balance the torque and enhance stability on the one hand, and on the other hand, it can make full use of the energy generated by the tangential fluid to ensure the fluid velocity and pressure stability and uniformity after the valve is switched. When the fluid pressure in the pipeline is uniform, the force exerted by the fluid on the valve core 2 is relatively stable, and the impact on the valve core 2 is small, which can make the entire fluid system run more smoothly, avoid problems such as unstable flow caused by pressure fluctuations, and improve the system operation efficiency. In addition, the above two types of buffer structures also have a function of mixing two or more media in the fluid, which helps to improve the uniformity of distribution of one medium in another medium, and can adaptively adjust the mixing speed according to the fluid velocity. Therefore, when the valve is used in the fields of chemical materials, it can play a very critical role in improving quality and efficiency.

[0025] In an optional embodiment, the adaptive pitch disc 6 is an annular disc, the limiting track 61 is a strip groove arranged on the outer wall of the annular disc, and two or more adaptive rotating shafts 51 are evenly distributed along the circumferential direction on the rotating frame 5. The adaptive pitch disc 6 is provided with two or more strip grooves corresponding to the swing cranks 53 in the circumferential direction, and the swing crank 53 is slidably connected to the strip groove through the limiting rod 531.

[0026] From the above description, it can be seen that the design stability of the annular disk is better. When the blade flips, the 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 grooves and jointly drive the adaptive variable pitch disk 6 to move. The variable pitch damper 54 transmits the same force to each buffer blade 52 through the annular disk, and the flipping angle of the buffer blade 52 is consistent, thereby improving stability.

[0027] In an optional embodiment, a guide rib 32 is provided on the inner wall of the valve seat 3 between the bracket 4 and the valve core 2. The guide rib 32 is parallel to the axis of the valve seat 3, and two or more guide ribs 32 are evenly arranged along the circumferential direction on the inner wall of the valve seat 3.

[0028] From the above description, it can be seen that the guide rib 32 has the function of diverting and guiding flow. It is located on the side of the blade buffer assembly close to the valve core 2. After the blade buffer assembly acts, the fluid is guided by the guide rib 32 to ensure the fluid speed and pressure stability and uniformity after the valve is switched.

[0029] In an optional embodiment, the inner wall of the valve seat 3 has two or more groups of slots 31 evenly distributed along the circumferential direction, and the bracket 4 has two or more supporting points that are detachably engaged with the slots 31 one by one.

[0030] From the above description, it can be seen that a slot 31 is designed on the inner wall of the valve seat 3 for installing the bracket 4, and the fulcrum of the bracket 4 is embedded in the slot 31 and fixed. This can not only ensure the installation and use stability of the blade buffer assembly, but also facilitate the disassembly and maintenance or replacement of buffer blades 52 and variable pitch dampers 54 of different sizes to adjust the resistance change range as needed.

[0031] In an optional embodiment, a bearing 41 is provided at the center of the bracket 4 , and the rotating frame 5 is connected to the bearing 41 via an elastic telescopic mounting shaft 42 .

[0032] From the above description, it can be seen that the elastic telescopic mounting shaft 42 has the functions of telescopic and elastic recovery. The rotating frame 5 is installed on the bracket 4 using this connection method. When the fluid pressure increases sharply, the elastic telescopic mounting shaft 42 is compressed and deformed. The elastic force generated by it cooperates with the buffer blades 52 to buffer the fluid, thereby achieving a protective effect on the valve core 2 and the components.

[0033] In an optional embodiment, the card slot 31 includes an insertion slot 311 and a fixed slot 312. The insertion slot 311 is parallel to the axis of the valve seat 3, and the fixed slot 312 is perpendicular to the insertion slot 311. A card block is provided at the fulcrum, and the card block is inserted into the insertion slot 311 and then engaged with the fixed slot 312.

[0034] From the above description, it can be seen that several supporting points of the bracket 4 are simultaneously installed in the insertion groove 311 along the axial direction of the valve seat 3. After sliding to the bottom end of the insertion groove 311, the entire bracket 4 is rotated by a certain angle so that the supporting block is engaged with the fixed groove 312. The direction in which the block is engaged with the fixed groove 312 is designed according to the rotation direction of the blade, which can prevent the bracket 4 from falling out of the slot 31.

[0035] In an optional embodiment, a protective cover 56 is detachably provided on the rotating frame 5, and the protective cover 56 covers the adaptive pitch disc 6, the 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 for the other end of the adaptive rotating shaft 51 to pass through.

[0036] As can be seen from the above description, the function of the protective cover 56 is to prevent the high-pressure fluid from damaging the components of the blade buffer assembly and to facilitate the disassembly and assembly of the entire blade buffer assembly on the valve.

[0037] In an optional embodiment, the pitch change damper 54 is a spring, and both ends of the spring are detachably connected to the rotating frame 5 and the adaptive pitch change disc 6 respectively.

[0038] From the above description, it can be seen that using a spring as the variable distance damper 54 has the advantages of small size, easy replacement, and low cost.

[0039] Please refer to Figures 1 to 6 As shown, the first embodiment of the present invention is as follows: This embodiment takes a ball valve as an example. The ball valve is a commonly used valve that relies on a rotating valve core 2 to open or close the valve. It is characterized by being easy to switch, small in size, and easy to maintain. The valve buffer device includes a ball valve, which is provided with a valve core 2 and a valve seat 3. The valve seat 3 is provided with a bracket 4 that is detachable. The bracket 4 is provided with a rotating frame 5 that is rotatable. The rotating frame 5 in this embodiment is a turntable. 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 more than two mounting seats along 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. The two ends of the adaptive rotating shaft 51 are respectively connected to a buffer blade 52 and a swing crank 53. The shape of the buffer blade 52 is a fan ring. The swing crank 53 is arranged along the diameter of the adaptive rotating shaft 51. The rotating frame 5 is detachably provided with a pitch damper 54, the elastic direction of the pitch damper 54 coincides with the rotation axis of the rotating frame 5, the pitch damper 54 is connected to the adaptive pitch disc 6, the adaptive pitch disc 6 is provided with a limiting track 61, the limiting track 61 is perpendicular to the rotation axis of the rotating frame 5, the swing crank 53 is slidingly connected to the limiting track 61, the helix angle of the buffer blade 52 is positively correlated with the elastic force of the pitch damper 54, that is, the helix angle of the buffer blade 52 increases, the elastic force of the pitch damper 54 is also greater, and the helix angle of the buffer blade 52 decreases, the elastic force of the pitch damper 54 is also smaller.

[0040] The rotating frame 5 is located on the side of the bracket 4 away from the valve core 2. The adaptive rotating shaft 51 is provided on the end surface of the rotating frame 5 close to the valve core 2. The end surface of the rotating frame 5 away from the valve core 2 is provided with an inverted conical boss 55. The inverted conical boss 55 has a conical shape, and the axis of the cone coincides with the axis of the valve seat 3. The adaptive pitch-changing disk 6 is an annular disk with an annular vertical plate on the edge of the annular disk. The limiting track 61 is an arcuate groove provided on the annular vertical plate. The circumferential surface of the arcuate groove is perpendicular to the axis of the valve seat 3. Two or more adaptive rotating shafts 51 are evenly distributed along the circumference of the rotating frame 5. The adaptive pitch-changing disk 6 is provided with two or more strip grooves corresponding to the swing cranks 53 along the circumference. The swing cranks 53 are slidably connected to the strip grooves via a limiting rod 531. The limiting rod 531 is a round rod parallel to the adaptive rotating shaft 51. The limiting rod 531 is inserted into the strip groove and can slide. The valve seat 3 is located between the bracket 4 and the valve core 2 and has guide ribs 32 on its inner wall. The guide ribs 32 are parallel to the axis of the valve seat 3. Two or more guide ribs 32 are evenly arranged along the circumferential direction on the inner wall of the valve seat 3. The surface of the guide ribs 32 is an arc. The inner wall of the valve seat 3 has two or more groups of slots 31 evenly distributed along the circumference. The bracket 4 has a cross-shaped shape, and the four fulcrums of the bracket 4 are respectively connected to the four groups of slots 31 in a one-to-one correspondence. The slots 31 include an insertion slot 311 and a fixed slot 312. The insertion slot 311 is parallel to the axis of the valve seat 3, and the fixed slot 312 is perpendicular to the insertion slot 311. The fulcrum is provided with a block, which is inserted into the insertion slot 311 and connected to the fixed slot 312. The raised rubber pad on the inner wall of the fixed slot 312 can not only improve the assembly tightness of the block, but also reduce the vibration of the bracket 4, improve stability, and enhance the buffering capacity. A bearing 41 is located at the center of the bracket 4. The rotating frame 5 is connected to the bearing 41 via an elastic, telescopic mounting shaft 42. The elastic, telescopic mounting shaft 42 comprises a support rod and a telescopic rod. The support rod has a telescopic hole, into which the telescopic rod slides. The telescopic hole is provided with an elastic member, which supports the telescopic rod. In this embodiment, the elastic member is a spring. A removable protective cover 56 is mounted on the rotating frame 5. The inner sidewall of the protective cover 56 has a reinforcing rib structure. The rotating frame 5 is provided with a locking slot. The protective cover 56 has a lock latch that locks with the lock slot. The protective cover 56 has a rubber sealing surface. When the lock latch is locked with the lock slot, the rubber sealing surface of the protective cover 56 presses against the rotating frame 5 to achieve a seal. The protective cover 56 houses the adaptive pitch disc 6, the pitch damper 54, the swing crank 53, and one end of the adaptive rotating shaft 51. The protective cover 56 has a through hole 561 through which the other end of the adaptive rotating shaft 51 passes. The through hole 561 is equipped with a seal to ensure a tight seal while allowing the adaptive rotating shaft 51 to rotate. In this embodiment, the pitch-variable damper 54 is a spring, and both ends of the spring can be screwed or clamped to the rotating frame 5 and the adaptive pitch-variable disc 6 respectively through a connecting seat to achieve quick disassembly and assembly and pressure adjustment.

[0041] Please refer to Figures 7 to 10As shown, the difference between the second embodiment of the present invention and the first embodiment is that a rotating frame 5 is provided on the side of the bracket 4 close to the valve core 2 and the side away from the valve core 2, the two rotating frames 5 are coaxially arranged, and the rotation directions of the buffer blades 52 on the two rotating frames 5 are opposite.

[0042] Please refer to Figures 7 to 10 As shown, the third embodiment of the present invention is based on the second embodiment: the shafts of the two rotating frames 5 are connected by three bevel gears, which are mounted on the bracket 4. Each of the two rotating frames 5 is coaxially fixed to a bevel gear, and the two bevel gears are meshed with each other through another bevel gear. This allows the two rotating frames 5 to rotate in opposite directions at the same speed. For ease of illustration, the bevel gear mounting structure in the figure is open. In practice, to ensure sealing, the bevel gear mounting structure should be designed to be sealed to prevent damage caused by water impact and ensure a good seal.

[0043] Please refer to Figures 3 to 8 As shown, the fourth embodiment of the present invention further includes a valve stem 7 , which is inserted into the valve body 1 and connected to the valve core 2 for controlling the rotation and opening and closing of the valve core 2 .

[0044] In summary, the buffer device for valves of the present invention is provided with a blade buffer assembly whose angle can be adaptively changed in the valve seat. The blade buffer assembly is detachably installed in the valve seat through a bracket to facilitate maintenance or replacement of different sizes and specifications to adjust the resistance change threshold range as needed. The blade buffer assembly includes a rotating frame and an adaptive rotating shaft, a variable pitch damper and an adaptive variable pitch disk installed on the rotating frame. The adaptive rotating shaft connects the buffer blade and the adaptive variable pitch disk. When the valve is closed, the pressure applied by the fluid to the buffer blade is small. At this time, the spiral angle of the buffer blade is minimum, that is, the buffer blade 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, and the pressure applied by the fluid to the buffer blade becomes larger. At this time, the spiral angle of the buffer blade gradually increases while buffering the fluid impact, that is, gradually tends to be parallel to the open state of the axis of the valve seat. In this process, the buffer blade is impacted and rotates, which can greatly unload the impact force of the fluid, thereby avoiding damage to the valve core. At the same time, as the buffer blade gradually opens Angle, the adaptive rotating shaft drives the swing crank to rotate synchronously, and the adaptive pitch disc is relatively displaced with the rotating frame under the relative constraints of the swing crank and the limit track, so that the elastic force of the pitch damper in the opposite displacement direction gradually increases, and the force of the pitch damper acting on the buffer blade can be used for buffering and is also conducive to maintaining the stability of the buffer blade angle. Since more than two adaptive rotating shafts are connected to an adaptive pitch disc, the force transmitted to each buffer blade by the pitch damper through the adaptive pitch disc is the same, and the flipping angle of the buffer blade is consistent. When the valve switching is completed, the fluid pressure tends to stabilize. At this time, the flipping angle of the buffer blade is opened to the maximum, the rotation speed of the rotating frame is reduced to the minimum, and the fluid flow rate is stable and uniform, thereby avoiding affecting the fluid flow rate, and the uneven scouring of the internal structure of the valve by the fluid causes scratches, dents or material peeling on the sealing surface, destroying the originally tight sealing performance, and then causing fluid leakage, resulting in medium waste and even safety hazards, such as fire, explosion or casualties. The present invention designs a buffer device for a valve that can adaptively change the buffer resistance. The adaptive adjustment of the buffer resistance is achieved through the coordinated action of an adaptive rotating shaft, a variable pitch damper and an adaptive variable pitch disk. This solves the problem that the valve core is easily damaged when the valve is switched and overcomes the disadvantage that the traditional buffer structure has an adverse effect on the fluid flow rate and uniformity, resulting in reduced valve performance.

[0045] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A buffer device for a valve, comprising a valve body, a valve core and a valve seat provided in the valve body, characterized in that: A bracket is detachably provided in the valve seat, and a rotating frame is rotatably provided on the bracket. The rotating axis of the rotating frame is arranged along the axis of the valve seat. The rotating frame is provided with more than two adaptive rotating shafts along the circumferential direction. The adaptive rotating shaft is arranged along the radial direction of the rotating frame. The two ends of the adaptive rotating shaft are respectively connected to the buffer blade and the swing crank. The rotating frame is detachably provided with a variable pitch damper. The elastic force direction of the variable pitch damper is parallel to the rotating axis of the rotating frame. The variable pitch damper is connected to the adaptive variable pitch disk. The adaptive variable pitch disk 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 to the limiting track. The helical angle of the buffer blade is positively correlated with the elastic force of the variable pitch damper.

2. The buffer device for a valve according to claim 1, characterized in that: The rotating frame is located on the side of the bracket away from the valve core, the adaptive rotating shaft is arranged on the end surface of the rotating frame close to the valve core, and the end surface of the rotating frame away from the valve core is provided with an inverted cone boss.

3. The buffer device for a valve according to claim 1, characterized in that: A rotating frame is respectively provided on the side of the bracket close to the valve core and the side away from the valve core. The two rotating frames are coaxially arranged, and the rotation directions of the buffer blades on the two rotating frames are opposite.

4. The buffer device for a valve according to claim 2 or 3, characterized in that: The adaptive pitch disc is an annular disc, and the limiting track is a strip groove set on the outer wall of the annular disc. Two or more adaptive rotating shafts are evenly distributed along the circumferential direction on the rotating frame. The adaptive pitch disc is provided with two or more strip grooves corresponding to the swing cranks in the circumferential direction. The swing crank is slidably connected to the strip groove through a limiting rod.

5. The buffer device for a valve according to claim 1, characterized in that: The valve seat is provided with guide ribs on the inner wall between the bracket and the valve core. The guide ribs are parallel to the axis of the valve seat. Two or more guide ribs are evenly arranged along the circumferential direction on the inner wall of the valve seat.

6. The buffer device for a valve according to claim 1 or 5, characterized in that: The inner wall of the valve seat is evenly distributed with two or more groups of clamping grooves along the circumferential direction, and the bracket is provided with two or more supporting points which are detachably connected with the clamping grooves one by one.

7. The buffer device for a valve according to claim 6, characterized in that: A bearing is provided at the center of the bracket, and the rotating frame is connected to the bearing through an elastic telescopic mounting shaft.

8. The buffer device for a valve according to claim 6, characterized in that: The clamping slot includes an inserting slot and a fixing slot. The inserting slot is parallel to the axis of the valve seat, and the fixing slot is perpendicular to the inserting slot. A clamping block is provided at the fulcrum. The clamping block is inserted into the inserting slot and clamped with the fixing slot.

9. The buffer device for a valve according to claim 1, characterized in that: The rotating frame is detachably provided with a protective cover which covers the adaptive pitch disc, the pitch damper, the swing crank and one end of the adaptive rotating shaft. The protective cover is provided with a through hole for the other end of the adaptive rotating shaft to pass through.

10. The buffer device for a valve according to claim 1, characterized in that: The pitch variable damper is a spring, and both ends of the spring are detachably connected to the rotating frame and the adaptive pitch variable disc respectively.

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