Valve body anti-impact sealing mechanism and communication pipe butterfly valve

Abstract

The present application relates to butterfly valve body technical field, specifically is butterfly valve body anti-impact sealing mechanism and communication pipe and a kind of, including valve seat and rotatable setting in valve seat valve plate, valve plate is provided with mounting cavity, mounting cavity is provided with the drive ring that can move along the axis direction of valve plate;Valve plate is provided with sealing ring that is linked with drive ring, drive ring is used to drive sealing ring between expansion state and shrinkage state switching, to make sealing ring and valve seat sealing cooperation when valve plate is closed, make sealing ring shrinkage to reduce the direct contact of sealing ring and fluid when valve plate is opened.By the linkage setting of drive ring and sealing ring, make sealing ring only in expansion working state when valve body needs sealing, and in shrinkage state when valve body is opened fluid flow, fundamentally reduce the direct contact opportunity of sealing ring and fluid, effectively reduce the loss caused by fluid scouring to sealing ring, prolong the service life of sealing ring.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of butterfly valve body, in particular to a valve body anti-impact sealing mechanism and a communicating pipe butterfly valve. BACKGROUND

[0002] The butterfly valve is a simple structure regulating valve, its closing part (valve disc or butterfly plate) is disc-shaped, and the opening and closing action is realized by rotating around the valve shaft, which is widely used in low-pressure pipeline medium on-off control and throttling operation. The sealing performance of the butterfly valve is the core index to determine the quality and service life of the butterfly valve. The sealing mechanism of the existing butterfly valve is usually composed of a valve body sealing surface and a sealing ring installed on the sealing surface, and the sealing is realized by the adhesion of the sealing ring and the butterfly plate. However, in the actual use of the butterfly valve, since the sealing ring needs to be close to the flow passage to ensure the sealing effect, the side close to the water inlet is directly exposed to the flowing medium for a long time, and continuously bears the impact and erosion of the medium. Especially when the medium flow rate is high or contains impurities, the impact force is significantly enhanced, which easily leads to local wear, deformation and even damage of the sealing surface of the sealing ring, thereby causing the sealing effect to decline, the medium to leak and other problems, which seriously affects the normal operation and service life of the butterfly valve. Therefore, how to effectively alleviate the impact of the medium on the sealing ring has become a key requirement for the design of the sealing mechanism of the butterfly valve. For example, a butterfly valve sealing mechanism disclosed in Chinese Patent No. CN116292928B sets up a support plate, a triangular buffer rod, a flow divider and a spring assembly in the valve body, uses the triangular buffer rod to preliminarily buffer the medium, then divides the medium into multiple streams by the flow divider to weaken the impact force twice, and at the same time, the spring pushes the sealing gasket to cooperate with the butterfly plate to realize sealing, trying to reduce the wear of the sealing ring by the passive defense method of buffering and flow dividing. However, this scheme needs to additionally increase multiple components such as support plate, triangular buffer rod and flow divider, which not only increases the complexity of the internal structure of the valve body, but also occupies the flow passage space, which may lead to increased fluid flow resistance and affected flow efficiency. At the same time, its core idea is still limited to weakening the impact, and it does not fundamentally avoid the direct contact of the sealing ring with the fluid in the non-sealing state. SUMMARY

[0003] In view of the above problems, a valve body anti-impact sealing mechanism and a communicating pipe butterfly valve are provided. Through the linkage of the driving ring and the sealing ring, the sealing ring is only in the expanded working state when the valve body needs to be sealed, and is in the contracted flow-avoiding state when the valve body is opened for fluid flow, which fundamentally reduces the direct contact opportunity of the sealing ring with the fluid, effectively reduces the damage of the fluid erosion to the sealing ring, and prolongs the service life of the sealing ring.

[0004] To solve the prior art problems, the application provides a valve body anti-impact sealing mechanism, which comprises a valve seat and a valve plate rotatably arranged in the valve seat, the valve plate is provided with a mounting cavity, and a driving ring capable of moving along the axis direction of the valve plate is arranged in the mounting cavity; the valve plate is provided with a sealing ring connected with the driving ring, and the driving ring is used for driving the sealing ring to switch between an expanded state and a contracted state, so that the sealing ring is sealingly matched with the valve seat when the valve plate is closed, and the sealing ring is contracted to reduce the direct contact between the sealing ring and the fluid when the valve plate is opened.

[0005] Preferably, a rotatable cam is arranged in the mounting cavity, the cam abuts against the driving ring, and the cam is used for pushing the driving ring to move along the axis direction of the valve plate by changing the contour of the cam, so as to drive the sealing ring to switch between the expanded state and the contracted state.

[0006] Preferably, the valve plate is provided with a valve rod for driving the valve plate to rotate, and the cam is sleeved on the valve rod and fixedly connected with the valve rod, so that the cam rotates synchronously with the valve rod when the valve plate rotates.

[0007] Preferably, the contour of the cam has a dwell section and a lift section, the dwell section corresponds to the main rotation interval of the valve plate from the open state to the closing state, at this time, the driving ring abuts against the dwell section of the cam and remains stationary, and the sealing ring maintains the contracted state; when the lift section of the cam corresponds to the terminal rotation interval of the valve plate from the closing state to the completely closed state, at this time, the cam pushes the driving ring to move along the axis of the valve plate through the lift section, so as to drive the sealing ring to switch from the contracted state to the expanded state.

[0008] Preferably, the cam has two, and the two cams are respectively arranged at the top and the bottom of the valve rod and fixedly connected with the valve rod.

[0009] Preferably, the valve plate is provided with a detachably connected mounting shell, and the mounting shell and the valve plate form the mounting cavity; a plurality of screw rods are arranged on the mounting shell and distributed equidistantly around the axis of the mounting shell, the plurality of screw rods are all threadedly connected with the valve plate through the mounting shell, the driving ring is provided with a mounting hole matched with the screw rods, and the driving ring can slide along the screw rods.

[0010] Preferably, a spring is sleeved on each screw rod, and the two ends of the spring are fixedly connected with the inner wall of the mounting shell and the driving ring respectively.

[0011] Preferably, the sealing ring is arranged between the mounting shell and the valve plate, the driving ring is provided with an annular groove matched with the sealing ring, and a conical surface is arranged on the annular groove and faces the valve seat.

[0012] Preferably, the driving ring is provided with an arc-shaped groove matched with the contour of the cam, and the cam is embedded in the arc-shaped groove and abuts against the groove wall when the cam rotates.

[0013] A communication pipe butterfly valve comprises the valve body anti-impact sealing mechanism.

[0014] The beneficial effects of the present application compared with the prior art are:

[0015] 1. The present application drives the ring and the sealing ring to expand and contract, and the sealing ring is only in the expanded state when the valve body needs to be sealed, and is in the contracted state when the valve body is opened for fluid flow, which fundamentally reduces the direct contact opportunity between the sealing ring and the fluid, effectively reduces the damage caused by fluid scouring to the sealing ring, and prolongs the service life of the sealing ring; at the same time, the sealing ring only expands when closed and seals with the valve seat, which can ensure the tightness of the sealing ring during sealing, improve the sealing reliability of the valve body in the closed state, and avoid the leakage problem caused by the decline of sealing performance due to long-term exposure of the sealing ring to scouring.

[0016] 2. The present application sets a cam in the installation cavity and uses the change of the cam profile to push the drive ring to move, without forcibly associating the cam with the rotating shaft of the valve plate, so that the driving mode is more flexible and suitable for different valve control scenes; the change of the cam profile has a clear regularity, which can accurately control the moving stroke and speed of the drive ring, ensure the stable expansion of the sealing ring when sealing is needed, and reliable contraction when flow avoidance is needed, effectively avoid the half-exposure or half- extrusion of the sealing ring at the intermediate angle, greatly reduce the damage of fluid scouring to the sealing ring, and prolong the service life of the sealing ring.

[0017] 3. The present application realizes efficient conversion of axial force to radial force through the tapered surface of the annular groove, so that the expansion and contraction actions of the sealing ring are more direct and labor-saving, and the rapidity and accuracy of the sealing state switching are ensured; the sealing ring does not move axially with the drive ring, avoiding axial friction with the installation shell and the valve plate, greatly reducing wear and tear, and prolonging the service life of the sealing ring; at the same time, the abutting cooperation of the tapered surface and the sealing ring has self-guiding property, which can ensure the uniform circumferential stress of the sealing ring, avoid local excessive extrusion or insufficient deformation, ensure the tightness of the sealing surface, and improve the sealing reliability; combined with the space constraint of the installation shell and the valve plate on the sealing ring, the tapered surface pushing mode can also make the deformation range of the sealing ring more controllable, so that the sealing performance can be kept stable even under high-pressure fluid impact, and the overall impact resistance of the valve body is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a perspective structural schematic diagram of a valve body impact-resistant sealing mechanism.

[0019] Figure 2 is a sectional structural schematic diagram of a valve body impact-resistant sealing mechanism Figure 1 .

[0020] Figure 3 is Figure 2 an enlarged view of A in FIG.

[0021] Figure 4It is a cross-sectional structure diagram of a valve body anti-impact sealing mechanism and a communication pipe butterfly valve.

[0022] Figure 5 It is a three-dimensional structure diagram of a valve plate in a valve body anti-impact sealing mechanism.

[0023] Figure 6 It is a cross-sectional structure diagram of a valve plate in a valve body anti-impact sealing mechanism.

[0024] Figure 7 It is Figure 6 It is an enlarged view of B in the figure.

[0025] Figure 8 It is a cross-sectional structure diagram of a valve plate in a valve body anti-impact sealing mechanism.

[0026] Figure 9 It is an exploded view of a valve plate in a valve body anti-impact sealing mechanism.

[0027] Figure 10 It is a three-dimensional structure diagram of a driving ring in a valve body anti-impact sealing mechanism.

[0028] Figure 11 It is a cross-sectional structure diagram of a valve body anti-impact sealing mechanism Figure 2 .

[0029] Figure 12 It is a three-dimensional structure diagram of a valve rod and two cams in a valve body anti-impact sealing mechanism.

[0030] In the figure, the reference numerals are: 1, valve seat; 2, valve plate; 21, mounting cavity; 211, driving ring; 2111, mounting hole; 2112, annular groove; 2113, arc-shaped slot; 212, sealing ring; 213, mounting shell; 2131, screw rod; 2132, spring; 22, valve rod; 221, cam. DETAILED DESCRIPTION

[0031] In order to further understand the features, technical means and achieved specific purposes and functions of the present application, the present application is described in further detail below in combination with the drawings and specific embodiments.

[0032] As Figures 1 to 8As shown: a valve body impact-resistant sealing mechanism, comprising a valve seat 1 and a valve plate 2 rotatably arranged in the valve seat 1, the valve plate 2 is provided with a mounting cavity 21, and the mounting cavity 21 is provided with a driving ring 211 capable of moving along the axis direction of the valve plate 2; the valve plate 2 is provided with a sealing ring 212 linked with the driving ring 211, and the driving ring 211 is used to drive the sealing ring 212 to switch between the expanded state and the contracted state, so that the sealing ring 212 is in sealing cooperation with the valve seat 1 when the valve plate 2 is closed, and the sealing ring 212 is contracted to reduce the direct contact between the sealing ring 212 and the fluid when the valve plate 2 is opened.

[0033] When the sealing mechanism works, its action process is closely coordinated with the rotation state of the valve plate 2. When it is needed to close the valve body to block the fluid flow, the valve plate 2 is rotated to the direction of abutting the valve seat 1 under the action of external driving force. In this process, the driving ring 211 in the mounting cavity 21 moves synchronously along the axis direction of the valve plate 2. Since the sealing ring 212 is linked with the driving ring 211, the movement of the driving ring 211 will drive the sealing ring 212 to switch from the contracted state to the expanded state. The expanded sealing ring 212 can form a tight sealing cooperation with the valve seat 1, thereby blocking the flow path of the fluid between the valve seat 1 and the valve plate 2, and realizing reliable sealing. When it is needed to open the valve body to allow the fluid to pass or adjust the flow, the valve plate 2 is rotated away from the valve seat 1, and the driving ring 211 moves reversely along the axis of the valve plate 2, thereby driving the sealing ring 212 to switch from the expanded state to the contracted state. The contracted sealing ring 212 is no longer directly exposed to the fluid flow path, greatly reducing the direct contact with the fluid, and avoiding the direct flushing of the fluid to the sealing ring 212 in the flow process.

[0034] Through the linkage setting of the driving ring 211 and the sealing ring 212, the sealing ring 212 is only in the expanded working state when the valve body needs to be sealed, and is in the contracted flow-avoiding state when the valve body is opened for fluid flow. This fundamentally reduces the opportunity for direct contact between the sealing ring 212 and the fluid, effectively reduces the damage caused by fluid flushing to the sealing ring 212, and prolongs the service life of the sealing ring 212. At the same time, the sealing ring 212 is only expanded and sealed with the valve seat 1 when it is closed, which can ensure the tightness of the sealing, improve the sealing reliability of the valve body in the closed state, and avoid the leakage problem caused by the decline of the sealing performance due to the long-term exposure and flushing of the sealing ring 212.

[0035] As shown in Figures 1 to 8 , Figure 11 and Figure 12 , the mounting cavity 21 is provided with a rotatable cam 221, the cam 221 abuts against the driving ring 211, and the cam 221 is used to push the driving ring 211 to move along the axis direction of the valve plate 2 through the change of its own profile, so as to drive the sealing ring 212 to switch between the expanded state and the contracted state.

[0036] The sealing mechanism works as follows. When the valve body needs to be closed for sealing, the cam 221 in the mounting cavity 21 starts to rotate. As the cam 221 rotates, the protruding part on the profile of the cam 221 gradually abuts against the driving ring 211. As the cam 221 continues to rotate, the pushing force of the protruding part on the driving ring 211 gradually increases, thereby pushing the driving ring 211 to move along the axis of the valve plate 2 towards the side close to the sealing ring 212. Since the sealing ring 212 is linked with the driving ring 211, the movement of the driving ring 211 will drive the sealing ring 212 to move synchronously, so that the sealing ring 212 gradually switches from the contracted state to the expanded state, until the expanded sealing ring 212 forms a tight sealing fit with the valve seat 1, thereby blocking the flow of fluid between the valve seat 1 and the valve plate 2, and completing the sealing closure of the valve body. When the valve body needs to be opened to allow fluid to pass or adjust the flow, the cam 221 reverses its rotation, and the protruding part on the profile of the cam 221 gradually moves away from the driving ring 211, so that the pushing force on the driving ring 211 decreases. At this time, the driving ring 211 moves along the axis of the valve plate 2 in the opposite direction under the action of the restoring force, thereby driving the sealing ring 212 to gradually switch back to the contracted state from the expanded state, so that the sealing ring 212 is no longer directly exposed to the flow path of the fluid, reducing direct contact with the fluid.

[0037] It should be noted that the restoring force of the driving ring 211 can be achieved by various suitable mechanical means. For example, an elastic member can be arranged between the driving ring 211 and the inner wall of the mounting cavity 21. When the driving ring 211 is pushed by the cam 221, the elastic member will be compressed or stretched to store elastic potential energy. The reverse elastic force generated by the release of the potential energy of the elastic member will drive the driving ring 211 to move back. The gravity of the driving ring 211 itself can also be used. In the case of vertical installation of the valve body, when the pushing force of the cam 221 disappears, the driving ring 211 will fall along the axis under its own weight. The fluid pressure difference can also be used. When the valve plate 2 is opened, the fluid flowing against one side of the driving ring 211 in the contraction direction will generate a pressure, thereby forming an auxiliary restoring force. Regardless of the restoring method, the driving ring 211 will drive the sealing ring 212 to gradually switch back to the contracted state from the expanded state, so that the sealing ring 212 is no longer directly exposed to the flow path of the fluid.

[0038] By setting the cam 221 in the installation cavity 21 and pushing the driving ring 211 to move by using the profile change of the cam 221, the cam 221 is not forced to be associated with the rotation shaft of the valve plate 2, the driving mode is more flexible, and it is suitable for different valve body control scenes; the profile change of the cam 221 has a clear regularity, which can accurately control the moving stroke and speed of the driving ring 211, ensure that the sealing ring 212 stably expands when sealing is needed and reliably shrinks when flow avoidance is needed, effectively avoid the situation that the sealing ring 212 is half exposed or half extruded at the intermediate angle, greatly reduce the damage of fluid erosion to the sealing ring 212, and prolong the service life of the sealing ring 212; at the same time, the abutting structure of the cam 221 and the driving ring 211 is simple and compact, which can fully adapt to the space layout of the installation cavity 21 inside the valve plate 2, without the need for additional complex transmission components, reducing the overall complexity of the mechanism, facilitating assembly and later maintenance; and the cam 221 rotating driving mode has high stability, which can long-term guarantee the accuracy and reliability of the state switching of the sealing ring 212, thereby improving the working stability of the entire valve body sealing mechanism, and ensuring that the valve body has good sealing effect and can effectively resist the erosion of fluid to the sealing ring 212 in long-term use.

[0039] It should be noted that in addition to using the cam 221 for driving, the driving ring 211 can also be axially moved by various equivalent mechanical methods. For example, a wedge block mechanism can be provided in the installation cavity 21, when the valve rod 22 drives the valve plate 2 to rotate, the wedge block slides radially, and its inclined surface interacts with the driving ring 211 to convert radial motion into axial displacement of the driving ring 211, thereby driving the sealing ring 212 to expand or shrink; a threaded pair transmission can also be used, the driving element is in threaded engagement with the driving ring 211 when rotating, and drives the driving ring 211 to move axially along the valve plate 2 step by step; or magnetic force driving or fluid power auxiliary structure can be used to generate additional thrust on the driving ring 211 while the valve plate 2 is rotating, so as to complete the expansion and contraction switching of the driving ring 211.

[0040] As shown in Figures 1 to 8 , Figure 11 and Figure 12 : the valve plate 2 is provided with a valve rod 22 for driving it to rotate, and the cam 221 is sleeved on the valve rod 22 and fixedly connected therewith, so that the cam 221 rotates synchronously with the valve rod 22 when the valve plate 2 rotates.

[0041] The valve rod 22 is driven to rotate by an external driving force, and the cam 221 sleeved and fixed on the valve rod 22 is driven to rotate synchronously with the valve rod 22. When the valve plate 2 rotates to the closing direction, the cam 221 rotates synchronously and pushes the driving ring 211, so that the sealing ring 212 is switched from the contraction state to the expansion state to realize the sealing cooperation with the valve seat 1. When the valve plate 2 rotates to the opening direction, the cam 221 reversely rotates synchronously, the holding force of the driving ring 211 is reduced, the driving ring 211 is reset under the action of the elastic member, and the sealing ring 212 is contracted to reduce the contact with the fluid.

[0042] The cam 221 is sleeved and fixed on the valve rod 22 for driving the valve plate 2 to rotate, so that the cam 221, the valve plate 2 and the valve rod 22 form a synchronous rotating linkage relationship. No independent driving component needs to be additionally arranged for the cam 221, the overall structure of the mechanism is greatly simplified, the number of parts and the assembly complexity are reduced, and the fault risk caused by independent driving of multiple components is reduced. More importantly, the synchronous rotation of the cam 221 with the valve rod 22 can make the state switching of the sealing ring 212 strictly match the opening and closing action of the valve plate 2. When the valve plate 2 is closed, the sealing ring 212 is accurately expanded for sealing. When the valve plate 2 is opened, the sealing ring 212 is timely contracted to avoid the fluid. The problems that the valve plate 2 is not tightly closed but the sealing ring 212 is expanded or the valve plate 2 is opened but the sealing ring 212 is still exposed are completely avoided. The sealing reliability is ensured, the erosion loss of the sealing ring 212 by the fluid is minimized, the stability of the mechanism is further improved, and the service life of the mechanism is prolonged.

[0043] As shown in Figures 1 to 8 , Figure 11 and Figure 12 , the profile of the cam 221 has a dwell section and a lift section. The dwell section corresponds to the main rotation interval of the valve plate 2 from the opening state to the closing state. At this time, the driving ring 211 abuts against the dwell section of the cam 221 and remains stationary, and the sealing ring 212 maintains the contraction state. When the lift section of the cam 221 corresponds to the terminal rotation interval of the valve plate 2 from the closing state to the completely closed state, the cam 221 pushes the driving ring 211 to move along the axis of the valve plate 2 through the lift section, so as to drive the sealing ring 212 to switch from the contraction state to the expansion state.

[0044] The profile of the cam 221 is divided into the dwell section and the lift section, and corresponds to the rotation process of the valve plate 2.

[0045] When the valve plate 2 is in the main rotation interval from the opening state to the closing direction (i.e. most of the rotation process from fully open to close), the driving ring 211 is always in contact with the resident segment of the cam 221, and since the profile height of the resident segment remains unchanged, the driving ring 211 remains stationary in this interval, so that the sealing ring 212 is stably maintained in the contracted state and will not partially expand due to the rotation of the valve plate 2.

[0046] When the valve plate 2 is rotated to the end rotation interval from near closing to fully closing (i.e. a small range of rotation process near closing), the driving ring 211 starts to contact the raised segment of the cam 221, and as the valve plate 2 continues to rotate, the profile height of the raised segment gradually changes, pushing the driving ring 211 to move along the axis of the valve plate 2, driving the sealing ring 212 to quickly switch from the contracted state to the expanded state, until the valve plate 2 is fully closed, the sealing ring 212 just forms a sealing fit with the valve seat 1.

[0047] This arrangement clearly divides the action interval of the cam 221 into a main rotation interval and an end rotation interval, so that the sealing ring 212 can only be in a fully contracted state or a fully expanded state, where the fully contracted state can avoid direct contact with the fluid to reduce erosion, and the fully expanded state can achieve a sealing fit with the valve seat 1, avoiding the transition state of the sealing ring 212 being half expanded or half contracted at the intermediate rotation angle.

[0048] By dividing the profile of the cam 221 into intervals, the state switching of the sealing ring 212 is strictly phase-corresponding to the rotation process of the valve plate 2, the sealing ring 212 is always contracted in the main rotation interval, avoiding the erosion caused by the partial exposure of the sealing ring 212 to the fluid at the intermediate angle, and preventing the problem of unreliable sealing in the half expanded state; the rapid switching in the end rotation interval ensures the timeliness and effectiveness of the sealing when the valve plate 2 is closed, ensuring the precise sealing fit; at the same time, this mechanical control method based on the profile of the cam 221 is stable and reliable, without the need for additional sensing or control components, it can achieve precise control of the state of the sealing ring 212 through the structure itself, simplifying the mechanism design and improving the working stability, so that the valve body can not only flexibly adjust the flow through the rotation of the valve plate 2 in long-term use, but also effectively protect the sealing ring 212, prolong its service life and ensure the durability of the sealing performance.

[0049] As shown in Figures 1 to 8 , Figure 11 and Figure 12 : the cam 221 has two, and the two cams 221 are respectively arranged at the top and bottom of the valve rod 22 and fixedly connected with the valve rod 22.

[0050] The two cams 221 rotate synchronously with the valve rod 22 and are always distributed on both sides of the drive ring 211 symmetrically to the axis of the valve rod 22. When the valve rod 22 drives the valve plate 2 to rotate in the closing direction, the two cams 221 act on the top and bottom of the drive ring 211 synchronously, and through balanced thrust, jointly push the drive ring 211 to move along the axis of the valve plate 2, drive the sealing ring 212 to switch from the contracted state to the expanded state, and realize the sealing cooperation with the valve seat 1; when the valve rod 22 drives the valve plate 2 to rotate in the opening direction, the two cams 221 rotate reversely synchronously, and the thrust on the drive ring 211 gradually decreases, the drive ring 211 reversely moves along the axis of the valve plate 2 under the action of the elastic member, the two cams 221 rotate synchronously with the valve rod 22 and reset with the drive ring 211, and drive the sealing ring 212 to switch from the expanded state back to the contracted state.

[0051] The symmetrical structure of the two cams 221 can make the drive ring 211 receive balanced axial force in the moving process, avoid the drive ring 211 from tilting, jamming or abnormally rubbing against the inner wall of the installation cavity 21 due to unilateral force, ensure the drive ring 211 to move smoothly along the axis of the valve plate 2, and further ensure the smoothness and accuracy of the state switching of the sealing ring 212; at the same time, the cooperative action of the two cams 221 can enhance the stability of the driving force, even if slight wear occurs in long-term use, the symmetrical structure can reduce the action deviation that may be caused by a single cam 221 driving, and improve the overall reliability of the mechanism; in addition, the two cams 221 are arranged to adapt to the axial layout of the valve rod 22, without the need to additionally expand the installation space, the stress state can be optimized through the structure itself, so that the valve body can maintain good sealing performance and impact resistance in long-term use, and the service life is prolonged.

[0052] As shown in Figure 2 , Figure 4 , Figure 6 , Figures 8 to 10 : the installation shell 213 is detachably connected on the valve plate 2, and the installation shell 213 and the valve plate 2 form the installation cavity 21; a plurality of screw rods 2131 are arranged on the installation shell 213 and are distributed around the axis of the installation shell 213, the plurality of screw rods 2131 are all screwed with the valve plate 2 through the installation shell 213, the drive ring 211 is provided with a plurality of mounting holes 2111 matched with the screw rods 2131, and the drive ring 211 can slide along the screw rods 2131.

[0053] The mounting shell 213 is assembled with the valve plate 2 through a detachable connection, and the two enclose a closed mounting cavity 21 to provide mounting space for the drive ring 211 and the sealing ring 212; a plurality of screw rods 2131 on the mounting shell 213 are equidistantly distributed around the axis, each screw rod 2131 is threadedly connected with the valve plate 2 after penetrating through the mounting shell 213, and the mounting shell 213 can be stably fixed on the valve plate 2 by tightening the screw rod 2131, so that the relative position between the mounting shell 213 and the valve plate 2 is stable, the structure of the mounting cavity 21 is fixed, and a reliable space basis is provided for the movement of the components in the mounting cavity 21. When the drive ring 211 moves along the axis of the valve plate 2 under the action of the cam 221 and other driving forces, the drive ring 211 is sleeved on each screw rod 2131 through the mounting hole 2111 matched with the screw rod 2131 thereon, and smoothly slides along the extension direction of the screw rod 2131, so that the screw rod 2131 limits the drive ring 211 in the circumferential direction and guides the drive ring 211 in the axial direction, avoiding the deflection, rotation or shaking of the drive ring 211 during movement, and ensuring that the drive ring 211 accurately drives the sealing ring 212 to switch states.

[0054] The detachable connection of the mounting shell 213 and the valve plate 2 cooperates with the threaded fixing mode of the screw rod 2131, which is convenient for assembling, repairing and replacing the internal components of the mounting cavity 21, and the mounting shell 213 and the valve plate 2 can be separated by detaching the screw rod 2131, which is simple and convenient; and the tightness and stability of the connection between the mounting shell 213 and the valve plate 2 can be ensured by the plurality of equidistantly distributed screw rods 2131, so that the relative displacement of the two under the action of fluid pressure is prevented, and the leakage of fluid into the mounting cavity 21 due to sealing failure is avoided. At the same time, the screw rod 2131 also serves as a guide component of the drive ring 211, and the equidistant distribution design makes the force on the drive ring 211 balanced, so that the drive ring 211 slides along the axis more smoothly, effectively reducing the friction between the drive ring 211 and the inner wall of the mounting cavity 21, ensuring the accuracy and smoothness of the state switching of the sealing ring 212, and the overall structure takes into account the convenience of assembly and maintenance, the reliability of connection and the stability of movement, thereby improving the practical value and service life of the mechanism.

[0055] As shown in Figure 2 , Figure 4 , Figure 6 , Figures 8 to 10 each screw rod 2131 is sleeved with a spring 2132, and the two ends of the spring 2132 are fixedly connected with the inner wall of the mounting shell 213 and the drive ring 211, respectively.

[0056] The spring 2132 is stably connected with the distribution of the screw rod 2131 and the mounting shell 213, when the driving ring 211 slides along the screw rod 2131 to the direction close to the valve seat 1 under the driving force of the cam 221 or the like to push the sealing ring 212 to expand, the driving ring 211 will stretch or compress the spring 2132 sleeved on the screw rod 2131, so that the spring 2132 stores elastic potential energy; at this time, the screw rod 2131 limits the spring 2132 in the circumferential direction to avoid the spring 2132 from deviating or twisting during deformation, and ensures that the spring 2132 always deforms along the axis direction of the screw rod 2131. When the pushing force of the cam 221 on the driving ring 211 decreases or disappears, the spring 2132 releases the stored elastic potential energy and generates a reverse force along the axis direction of the screw rod 2131 to drive the driving ring 211 to slide stably along the screw rod 2131 to the direction away from the valve seat 1, and then pull the sealing ring 212 to reset from the expanded state to the contracted state; during the whole process, the deformation and reset of the spring 2132 always rely on the guiding action of the screw rod 2131, and the sliding track of the driving ring 211 is consistent, which ensures the accuracy of the state switching of the sealing ring 212.

[0057] The spring 2132 on the screw rod 2131 can provide stable and directional reset power for the driving ring 211, and the limiting action of the screw rod 2131 on the spring 2132 avoids the deviation and jamming of the traditional spring 2132 during reset, which ensures that the driving ring 211 can accurately move along the axis of the valve plate 2 every time, further improves the reliability of the state switching of the sealing ring 212; at the same time, the setting of one spring 2132 corresponding to each screw rod 2131 makes the reset elastic force received by the driving ring 211 evenly distributed in the circumferential direction, avoids the inclination and jamming of the driving ring 211 due to uneven force on one side, reduces the friction loss between the driving ring 211 and the screw rod 2131 and the inner wall of the mounting cavity 21, and prolongs the service life of the components. In addition, the spring 2132 is directly sleeved on the screw rod 2131 and fixed between the mounting shell 213 and the driving ring 211, without the need for additional spring 2132 mounting bracket, which fully utilizes the existing structure space; and in cooperation with the detachable characteristics of the mounting shell 213, the disassembly, replacement and internal component maintenance of the spring 2132 are carried out synchronously, which is convenient to operate and further improves the maintenance convenience of the mechanism.

[0058] As shown in Figures 2 to 6 , Figures 8 to 10 : the sealing ring 212 is arranged between the mounting shell 213 and the valve plate 2, the driving ring 211 is provided with an annular groove 2112 matched with the sealing ring 212, and a tapered surface is arranged on the annular groove 2112 towards the side of the valve seat 1.

[0059] The driving ring 211 moves along the valve plate 2 axis, and the tapered surface of the annular groove 2112 of the driving ring 211 forms an axial thrust on the sealing ring 212. When the driving ring 211 moves towards the installation shell 213, the tapered surface moves synchronously with the driving ring 211, converts the axial force into radial force through the inclined tapered surface, pushes the sealing ring 212 to expand away from the axis of the driving ring 211, and forms a sealing fit with the valve seat 1. When the driving ring 211 moves towards the valve seat 1, the thrust of the tapered surface on the sealing ring 212 decreases, and the sealing ring 212 shrinks radially under the action of its own elasticity and fluid pressure, and is out of sealing contact with the valve seat 1, returning to the initial state. During the whole process, the sealing ring 212 is always in the fixed space between the installation shell 213 and the valve plate 2, only radial deformation occurs, and does not move axially with the driving ring 211.

[0060] The tapered surface of the annular groove 2112 realizes efficient conversion of axial force to radial force, making the expansion and contraction of the sealing ring 212 more direct and labor-saving, and ensuring the rapidity and accuracy of the sealing state switching. The sealing ring 212 does not move axially with the driving ring 211, avoiding axial friction with the installation shell 213 and the valve plate 2, greatly reducing wear and tear, and prolonging the service life of the sealing ring 212. At the same time, the abutting fit of the tapered surface and the sealing ring 212 has self-guiding property, which can ensure that the circumferential stress of the sealing ring 212 is uniform, avoid local excessive extrusion or insufficient deformation, ensure that the sealing surface is tightly fitted, and improve the sealing reliability. Combined with the space constraint of the installation shell 213 and the valve plate 2 on the sealing ring 212, the tapered surface pushing mode can also make the deformation range of the sealing ring 212 more controllable, so that the sealing performance can be kept stable even under high-pressure fluid impact, and the overall impact resistance of the valve body is enhanced.

[0061] As shown in Figures 9 to 12 , the driving ring 211 is provided with an arc-shaped groove 2113 matched with the outer shape of the cam 221, and the cam 221 is embedded in the arc-shaped groove 2113 and abuts against the groove wall when rotating.

[0062] Through the setting of the arc-shaped groove 2113, the contact area between the two is increased through the surface contact of the curved surface, and the contact stress is dispersed, avoiding local stress concentration to cause premature wear of the driving ring 211 or the cam 221, and improving the wear resistance and service life of the components. At the same time, the curved surface of the arc-shaped groove 2113 provides guidance for the rotation of the cam 221, making the process of the cam 221 pushing the driving ring 211 smoother, reducing the risk of jamming, and ensuring the stability and continuity of the movement of the driving ring 211 along the axis.

[0063] A communication pipe butterfly valve comprising a valve body impact-resistant sealing mechanism as described above.

[0064] The above embodiments only express one or several embodiments of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A valve body impact seal mechanism comprising a valve seat (1) and a valve plate (2) rotatably arranged in the valve seat (1), characterized in that, The valve plate (2) is provided with a mounting cavity (21), and the mounting cavity (21) is provided with a driving ring (211) capable of moving along the axis direction of the valve plate (2); The valve plate (2) is provided with a sealing ring (212) linked with the driving ring (211), and the driving ring (211) is used for driving the sealing ring (212) to switch between the expanded state and the contracted state, so that the sealing ring (212) is in sealing cooperation with the valve seat (1) when the valve plate (2) is closed, and the sealing ring (212) is contracted to reduce the direct contact between the sealing ring (212) and the fluid when the valve plate (2) is opened; The mounting cavity (21) is provided with a rotatable cam (221), the cam (221) abuts against the driving ring (211), and the cam (221) is used for pushing the driving ring (211) to move along the axis direction of the valve plate (2) through the change of the contour of the cam (221), so as to drive the sealing ring (212) to switch between the expanded state and the contracted state; The valve plate (2) is provided with a detachably connected mounting shell (213), and the mounting shell (213) and the valve plate (2) form the mounting cavity (21); The sealing ring (212) is arranged between the mounting shell (213) and the valve plate (2), the driving ring (211) is provided with an annular groove (2112) matched with the sealing ring (212), and the annular groove (2112) is provided with a tapered surface towards the valve seat (1) on one side.

2. A valve impact seal mechanism according to claim 1, wherein The valve plate (2) is provided with a valve rod (22) used for driving the valve plate (2) to rotate, and the cam (221) is sleeved on the valve rod (22) and fixedly connected with the valve rod (22), so that the cam (221) rotates synchronously with the valve rod (22) when the valve plate (2) rotates.

3. A valve impact seal mechanism according to claim 2, wherein, The contour of the cam (221) has a dwell section and a lift section, the dwell section corresponds to the main rotation interval of the valve plate (2) from the open state to the closing state, at this time, the driving ring (211) abuts against the dwell section of the cam (221) and remains stationary, and the sealing ring (212) maintains the contracted state; when the lift section of the cam (221) corresponds to the terminal rotation interval of the valve plate (2) from the closing state to the completely closed state, at this time, the cam (221) pushes the driving ring (211) to move along the axis of the valve plate (2) through the lift section, so as to drive the sealing ring (212) to switch from the contracted state to the expanded state.

4. A valve impact seal mechanism according to claim 2, wherein The cam (221) has two, and the two cams (221) are respectively arranged at the top and the bottom of the valve rod (22) and fixedly connected with the valve rod (22).

5. A valve impact seal mechanism according to claim 1, wherein The mounting shell (213) is provided with a plurality of screw rods (2131) equidistantly distributed around the axis thereof, the plurality of screw rods (2131) are all screwed with the valve plate (2) through the mounting shell (213), the driving ring (211) is provided with a mounting hole (2111) matched with the screw rod (2131), and the driving ring (211) can slide along the screw rod (2131).

6. A valve impact seal mechanism according to claim 5, wherein, Each screw rod (2131) is sleeved with a spring (2132), and the two ends of the spring (2132) are fixedly connected with the inner wall of the mounting shell (213) and the driving ring (211), respectively.

7. A valve impact seal mechanism according to claim 1, wherein The driving ring (211) is provided with an arc-shaped slot (2113) matching the outer shape of the cam (221), and the cam (221) is embedded in the arc-shaped slot (2113) and abuts against the slot wall when rotating.

8. A communication pipe butterfly valve comprising a valve body anti-impact sealing mechanism according to any one of claims 1-7.

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