An eccentric butterfly valve

Abstract

The present invention provides an eccentric butterfly valve, which can achieve uniform and stable contact sealing through the cooperation of the first sealing surface and the arc surface of the first wall surface, avoiding sealing failure caused by local stress concentration; through the conical bevel design of the second sealing surface and the second wall surface, it can withstand higher fluid pressure and complex working conditions. Due to the eccentric design of the valve stem and the disc plate, direct impact and friction are avoided, and the wear rate of the sealing ring is significantly reduced, thereby extending the service life. The eccentric design makes the disc plate have good controllability during the opening process, and can accurately control the contact area between the disc plate and the fluid, thereby realizing precise regulation of the fluid flow, which is particularly suitable for industrial scenarios that require fine flow control. Due to the eccentric structure adopted in the sealing design, the disc plate gradually reduces the contact force during the movement, especially the torque required for the initial opening is small. This design not only reduces the power consumption of the actuator, but also reduces the mechanical wear of the valve body.

Description

Technical Field

[0001] The invention relates to the technical field of butterfly valve sealing, and in particular to an eccentric butterfly valve. Background Art

[0002] The butterfly valve is a simple regulating valve that can be used for the on-off control of low-pressure pipeline fluids. The butterfly valve has a disc-shaped disc, and the driving mechanism drives the valve stem to rotate, driving the butterfly valve to rotate to open, close or adjust the flow of the fluid. The butterfly valve is not only simple in structure, small in size, light in weight, low in material consumption, small in installation size, small in driving torque, easy and quick to operate, but also has good flow regulation function and closing and sealing characteristics.

[0003] In the prior art, eccentric butterfly valves are divided into single eccentric butterfly valves, double eccentric butterfly valves, triple eccentric butterfly valves, and variable eccentric butterfly valves. When the existing eccentric butterfly valves are in use, after a high-pressure medium flows in the valve body for a long time, the sealing ring is easily worn or damaged, which reduces the sealing effect between the valve body and the disc plate, and then causes leakage in the eccentric butterfly valve. Summary of the invention

[0004] The purpose of the present invention is to provide an eccentric butterfly valve, which solves the technical problem of poor sealing effect of the eccentric butterfly valve in the prior art.

[0005] To achieve this object, the present invention adopts the following technical solutions: An eccentric butterfly valve, the eccentric butterfly valve is used to control the flow rate of a fluid medium, the eccentric butterfly valve comprises a valve body, a valve cover and an actuator connected in sequence, a sealing convex ring is arranged in the valve body; the valve body is rotatably connected to a valve stem, a disc plate is fixedly connected to the valve stem, and a sealing ring adapted to the sealing convex ring is installed on the disc plate; The sealing convex ring is provided with a first wall surface and a second wall surface opposite to each other, and the sealing ring is provided with a first sealing surface and a second sealing surface opposite to each other, the first sealing surface is used for contact sealing with the first wall surface, and the second sealing surface is used for contact sealing with the second wall surface; the first sealing surface and the first wall surface are both arc surfaces, and the second sealing surface and the second wall surface are both conical inclined surfaces; The actuator is used to drive the valve stem and the disc plate to rotate synchronously so that the sealing ring is close to or away from the sealing convex ring; the axis of the valve stem and the axis of the disc plate are offset.

[0006] Optionally, a pressing plate for crimping and fixing the sealing ring is provided on the disc plate, and the disc plate is fastened to the pressing plate by screws; Wherein, a mounting platform is provided on the disc plate and is arranged back to back to the pressure plate, and the mounting platform is fixedly sleeved with the valve stem.

[0007] Optionally, the disc plate is provided with a first mounting groove, the pressure plate is provided with a second mounting groove, and the sealing ring is located between the first mounting groove and the second mounting groove; Wherein, a first placement groove is provided in the sealing ring, a second placement groove corresponding to the first placement groove is provided on the pressing plate, and gaskets are placed in the first placement groove and the second placement groove.

[0008] Optionally, a first accommodating groove is provided in the sealing ring, a first mounting sleeve is placed in the first accommodating groove, and a first cavity is provided in the first mounting sleeve; A first sealing member and a first spring are disposed in the first cavity, one end of the first sealing member abuts against the first sealing surface, and the other end of the first sealing member is connected to the first spring.

[0009] Optionally, a first contact surface adapted to the first wall surface is provided on the first sealing member, and an end surface of the first mounting sleeve close to the first wall surface is provided with a gap between the first wall surface and the first wall surface.

[0010] Optionally, a second accommodating groove is provided in the sealing ring, a second mounting sleeve is placed in the second accommodating groove, a second cavity is provided in the second mounting sleeve, and a third mounting groove arranged in a T shape is provided in the sealing convex ring; The third installation groove is provided with a sliding sleeve and a sliding block which abut against each other, the sliding sleeve is embedded with a second sealing member, and the sliding block is used to squeeze the sliding sleeve to move under the pressure of the fluid medium so that the second sealing member enters the second cavity.

[0011] Optionally, a second spring and a mounting column are provided in the third mounting groove, and the mounting column and the sealing convex ring are an integrally formed structure; Wherein, one end of the second spring is connected to the sliding sleeve, and the other end of the second spring is sleeved with the mounting column.

[0012] Optionally, the sliding sleeve is provided with a first extrusion inclined surface, and the sliding block is provided with a second extrusion inclined surface matched with the first extrusion inclined surface.

[0013] Optionally, the slider sleeve is provided with at least one sealing sleeve, and the sealing sleeve abuts against the inner wall of the third mounting groove.

[0014] Optionally, an anti-slip protrusion is provided on one side of the sliding block, the anti-slip protrusion and the sliding block are an integrally formed structure, and the anti-slip protrusion is used to abut against an inner wall of the third mounting groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an eccentric butterfly valve, which specifically includes a valve body, a valve cover and an actuator connected in sequence. Through the cooperation between the first sealing surface and the arc surface of the first wall surface, a uniform and stable contact seal can be achieved, avoiding sealing failure due to local stress concentration; through the conical bevel design of the second sealing surface and the second wall surface, the sealing performance is further optimized, and it can withstand higher fluid pressures and complex working conditions. Due to the eccentric design of the valve stem and the disc plate, during the opening and closing process, the contact between the sealing ring and the sealing convex ring is gradually formed or released, avoiding direct impact and friction, significantly reducing the wear rate of the sealing ring, and thus extending the service life.

[0016] The eccentric design makes the disc plate well controllable during the opening process, and can accurately control the contact area between the disc plate and the fluid, thereby achieving precise regulation of the fluid flow rate, which is particularly suitable for industrial scenarios that require fine flow control. Due to the eccentric structure used in the sealing design, the disc plate gradually reduces the contact force during movement, especially when the initial opening requires a smaller torque. This design not only reduces the power consumption of the actuator, but also reduces the mechanical wear of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0019] Figure 1 A schematic diagram of the three-dimensional structure of an eccentric butterfly valve disclosed in an embodiment of the present invention; Figure 2 A schematic diagram of the side structure of an eccentric butterfly valve disclosed in an embodiment of the present invention; Figure 3 for Figure 2 AA cross-sectional structural diagram; Figure 4 for Figure 2 BB cross-sectional structure diagram; Figure 5 for Figure 4A schematic diagram of the enlarged structure at C; Figure 6 for Figure 4 A schematic diagram of the structure at D of FIG. Figure 7 A schematic cross-sectional structure diagram of another eccentric butterfly valve disclosed in an embodiment of the present invention; Figure 8 for Figure 7 A schematic diagram of the structure at E of FIG. Fig. 9 for Figure 7 A schematic diagram of the structure at F of FIG. Fig.10 for Fig. 9 A schematic diagram of the enlarged structure at G; Fig.11 The present invention is a schematic diagram of the side structure of a valve body in an eccentric butterfly valve disclosed in an embodiment of the present invention.

[0020] Illustration Description: 10. Valve body; 11. Sealing convex ring; 111. First wall surface; 112. Second wall surface; 113. Third mounting groove; 114. Mounting column; 20. Valve cover; 30. Actuator; 40. Valve stem; 50. Disc plate; 51. Mounting platform; 52. First mounting groove; 60. Sealing ring; 61. First sealing surface; 62. Second sealing surface; 63. First placement groove; 64. First receiving groove; 65. Second receiving groove; 70. Press plate; 71. Second mounting groove; 72. Second placement groove Groove; 80, gasket; 90, first sealing member; 91, first contact surface; 100, first spring; 200, second mounting sleeve; 201, second cavity; 202, fitting surface; 300, sliding sleeve; 301, first extrusion slope; 400, slider; 401, second extrusion slope; 402, anti-slip protrusion; 500, second sealing member; 501, second contact surface; 600, second spring; 700, sealing sleeve; 800, first mounting sleeve; 801, first cavity. DETAILED DESCRIPTION

[0021] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0023] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0024] The embodiment of the present invention provides an eccentric butterfly valve, such as Figure 1-11 As shown, the eccentric butterfly valve is used to control the flow rate of a fluid medium. The eccentric butterfly valve comprises a valve body 10, a valve cover 20 and an actuator 30 which are connected in sequence. A sealing convex ring 11 is arranged in the valve body 10. The valve body 10 is rotatably connected to a valve stem 40, a disc plate 50 is fixedly connected to the valve stem 40, and a sealing ring 60 which is adapted to the sealing convex ring 11 is installed on the disc plate 50. The sealing convex ring 11 is provided with a first wall surface 111 and a second wall surface 112 opposite to each other, and the sealing ring 60 is provided with a first sealing surface 61 and a second sealing surface 62 opposite to each other. The first sealing surface 61 is used for contact sealing with the first wall surface 111, and the second sealing surface 62 is used for contact sealing with the second wall surface 112. The first sealing surface 61 and the first wall surface 111 are both arc surfaces, and the second sealing surface 62 and the second wall surface 112 are both conical inclined surfaces. The actuator 30 is used to drive the valve stem 40 and the disc plate 50 to rotate synchronously so that the sealing ring 60 is close to or away from the sealing convex ring 11; the axis of the valve stem 40 and the axis of the disc plate 50 are offset. In this embodiment, the actuator 30 is a manual actuator 30 or an electric actuator 30, and a display panel for displaying the rotation angle of the disc plate 50 is provided on the actuator 30.

[0025] It should be noted that the eccentric butterfly valve provided by the present invention specifically includes a valve body 10, a valve cover 20 and an actuator 30 connected in sequence. By cooperating between the first sealing surface 61 and the arc surface of the first wall surface 111, a uniform and stable contact seal can be achieved to avoid sealing failure due to local stress concentration; by the conical bevel design of the second sealing surface 62 and the second wall surface 112, the sealing performance is further optimized, and it can withstand higher fluid pressures and complex working conditions. Due to the eccentric design of the valve stem 40 and the disc plate 50, during the opening and closing process, the contact between the sealing ring 60 and the sealing convex ring 11 is gradually formed or released, avoiding direct impact and friction, significantly reducing the wear rate of the sealing ring 60, and thus extending the service life.

[0026] The eccentric design makes the disc plate 50 well controllable during the opening process, and can accurately control the contact area between the disc plate 50 and the fluid, thereby achieving precise regulation of the fluid flow rate, which is particularly suitable for industrial scenarios that require fine flow control. Due to the eccentric structure used in the sealing design, the disc plate 50 gradually reduces the contact force during the movement, especially when the initial opening requires a smaller torque. This design not only reduces the power consumption of the actuator 30, but also reduces the mechanical wear of the valve body 10.

[0027] like Figure 1-6 As shown, a pressing plate 70 for crimping and fixing the sealing ring 60 is provided on the disc plate 50, and the disc plate 50 and the pressing plate 70 are fastened and connected by screws; in this embodiment, a pressing plate 70 is provided on the disc plate 50, and the pressing plate 70 and the disc plate 50 are fastened and connected by screws, so as to realize the crimping and fixing of the sealing ring 60. This structure can provide uniform pressure distribution while maintaining the stability of the sealing ring 60, ensure the firm connection between the sealing ring 60 and the disc plate 50, and avoid the loosening or displacement of the sealing ring 60 during long-term use. The design of the pressing plate 70 is distributed on the surface of the disc plate 50, and is fastened and connected by screws to form a reliable mechanical fixing method. The setting of the mounting platform 51 not only optimizes the force structure of the disc plate 50 and the valve stem 40, but also enhances the mechanical strength of the entire butterfly plate, avoids displacement or loosening caused by long-term use, and adapts to high-pressure and high-flow rate working conditions.

[0028] Among them, the disc plate 50 is provided with a mounting platform 51 which is arranged opposite to the pressure plate 70, and the mounting platform 51 is fixedly sleeved with the valve stem 40. In this embodiment, the number of mounting platforms 51 is set to two, and through the setting of the mounting platforms 51, the axis of the valve stem 40 and the axis of the disc plate 50 are offset. In this embodiment, the arrangement of the two mounting platforms 51 makes the installation of the disc plate 50 and the valve stem 40 more stable, and at the same time, through the ingenious eccentric design, the axis of the valve stem 40 and the axis of the disc plate 50 are offset. The eccentric axis setting helps to produce a unique motion trajectory during the opening and closing of the valve.

[0029] It should be noted that the valve stem 40 drives the disc plate 50 to rotate, so that the sealing ring 60 contacts the sealing convex ring 11 to achieve reliable sealing. Due to the eccentric design, the contact pressure can be gradually reduced during the rotation of the disc plate 50, rather than directly impacting the sealing surface, so that the sealing action is smoother. After the valve is opened, the rotation of the disc plate 50 drives the sealing ring 60 away from the sealing convex ring 11 to achieve the circulation of the fluid.

[0030] like Figure 7-9As shown, the disc plate 50 is provided with a first mounting groove 52, the pressure plate 70 is provided with a second mounting groove 71, and the sealing ring 60 is located between the first mounting groove 52 and the second mounting groove 71; in this embodiment, the design of the first mounting groove 52 and the second mounting groove 71 allows the sealing ring 60 to remain stable under high pressure and high flow rate conditions. The multi-level fixed structure of the sealing ring 60 effectively prevents displacement caused by medium impact or vibration.

[0031] Among them, the sealing ring 60 is provided with a first placement groove 63, the pressing plate 70 is provided with a second placement groove 72 corresponding to the first placement groove 63, and a gasket 80 is placed in the first placement groove 63 and the second placement groove 72. In this embodiment, the gasket 80 plays a filling and supporting role in the fixing process of the sealing ring 60. The gasket 80 can effectively buffer the external impact force and prevent the sealing ring 60 from being deformed due to long-term use or uneven force. At the same time, the gasket 80 can further enhance the sealing effect of the sealing ring 60 and adapt to higher working pressure.

[0032] like Figure 7-11 As shown, a first receiving groove 64 is provided in the sealing ring 60, a first installation sleeve 800 is placed in the first receiving groove 64, and a first cavity 801 is provided in the first installation sleeve 800; The first cavity 801 is provided with a first seal 90 and a first spring 100, one end of the first seal 90 abuts against the first sealing surface 61, and the other end of the first seal 90 is connected to the first spring 100. In this embodiment, the first seal 90 is made of elastic material, such as rubber or silicone. When the disc plate 50 rotates to make the seal ring 60 contact or move away from the sealing convex ring 11, the first spring 100 generates an elastic restoring force, so that the first seal 90 always maintains a moderate pressure on the first wall surface 111. This design not only ensures the dynamic adaptability of the seal, but also makes up for the problem of reduced sealing performance of the seal ring 60 due to thermal expansion and contraction of the material or long-term use.

[0033] It should be noted that the dynamic sealing performance of the sealing ring 60 is achieved through the cooperation of the first spring 100 and the first sealing member 90 in the first mounting sleeve 800. The continuous pressure provided by the spring ensures the stable contact between the sealing ring 60 and the sealing convex ring 11, and can maintain a reliable seal even in high-pressure and high-frequency opening and closing operations. The pressure distribution of the sealing ring 60 in the sealed state is more uniform, effectively avoiding the early failure of the sealing ring 60 caused by local overpressure.

[0034] In summary, through the design of the first mounting groove 52, the second mounting groove 71, the gasket 80, the first mounting sleeve 800 and its internal elastic components, the technical solution greatly enhances the fixing strength, sealing reliability and dynamic adaptability of the sealing ring 60. The structure is particularly suitable for high-pressure, high-frequency opening and closing fluid control scenarios, and its multi-level sealing protection mechanism and flexible dynamic adjustment capability have wide promotion value in industrial applications.

[0035] like Figure 7 and Figure 8 As shown, the first sealing member 90 is provided with a first contact surface 91 adapted to the first wall surface 111, and an end surface of the first mounting sleeve 800 close to the first wall surface 111 is provided with a gap with the first wall surface 111. In this embodiment, in the closed state, the first contact surface 91 is in close contact with the first wall surface 111, and a reliable sealing effect is achieved through precise geometric matching. Since the first contact surface 91 and the first wall surface 111 are designed as an adaptive structure, their contact area is optimally distributed, thereby avoiding damage to the first sealing member 90 due to excessive local pressure. The existence of the gap allows the first mounting sleeve 800 to produce a slight displacement within a certain range, thereby buffering the mechanical strain caused by fluid impact or thermal expansion and contraction.

[0036] It should be noted that, in the closed state, the elastic pressure applied by the first spring 100 pushes the first seal 90 toward the first wall 111, so that the first contact surface 91 forms an effective seal with the first wall 111. When the disc 50 rotates away from the sealing convex ring 11, the first seal 90 gradually separates from the first wall 111 under the action of the first spring 100, forming a process of releasing the seal. By setting the gap, it is ensured that the first mounting sleeve 800 does not come into direct contact with the first wall 111 during the entire movement process, and at the same time, the first seal 90 is protected from excessive mechanical stress.

[0037] like Figure 7-10 As shown, the sealing ring 60 is provided with a second receiving groove 65, the second mounting sleeve 200 is placed in the second receiving groove 65, the second mounting sleeve 200 is provided with a second cavity 201, and the sealing convex ring 11 is provided with a third mounting groove 113 arranged in a T shape; in this embodiment, the sealing ring 60 is provided with a second receiving groove 65, and the second mounting sleeve 200 is tightly embedded therein to form a stable sealing support structure. The second cavity 201 is designed in the second mounting sleeve 200 to provide space and structural basis for subsequent sealing actions. This combination ensures that the sealing ring 60 has good structural stability and provides sufficient accommodation capacity for dynamic sealing actions.

[0038] The third mounting groove 113 is provided with a sliding sleeve 300 and a slider 400 that abut against each other, a second sealing member 500 is embedded in the sliding sleeve 300, and the slider 400 is used to squeeze the sliding sleeve 300 to move under the pressure of the fluid medium, so that the second sealing member 500 enters the second cavity 201. In this embodiment, a T-shaped third mounting groove 113 is provided in the sealing convex ring 11, and the sliding sleeve 300 and the slider 400 are installed in the third mounting groove 113. The sliding sleeve 300 and the slider 400 abut against each other to form a combined component, and the sliding sleeve 300 is embedded with the second sealing member 500. The T-shaped third mounting groove 113 can effectively guide the movement of the slider 400, and at the same time provide sufficient support and restriction for the sliding sleeve 300 and the slider 400, so as to prevent the slider 400 from deviating from its running track.

[0039] It should be noted that when the fluid medium acts on the surface of the slider 400, the slider 400 squeezes the sleeve 300 inward under the push of the fluid pressure. The sleeve 300 moves axially under the push of the slider 400, so that the second sealing member 500 gradually enters the second cavity 201 inside the sealing ring 60. In this process, the close fit between the slider 400 and the sleeve 300 avoids leakage and instability.

[0040] Specifically, the second seal 500 is provided with a second contact surface 501 corresponding to the second wall surface 112, and the second mounting sleeve 200 is provided with a fitting surface 202 adapted to the second contact surface 501. When the sliding sleeve 300 pushes the second seal 500 into the second cavity 201, the second contact surface 501 gradually fits onto the second wall surface 112 to form a reliable sealing contact interface. Through precise matching of geometric shapes, the pressure distribution between the contact surfaces is ensured to be uniform, thereby achieving efficient sealing. Due to the restraining effect of the fitting surface 202, the second seal 500 can remain stable under high pressure conditions. Even if the pressure fluctuates, the second seal 500 can adjust its contact state in real time to adapt to different working conditions. The fitting surface 202 provides stable support for the second seal 500, avoiding wear of the seal due to excessive deformation or offset under high pressure. In addition, the optimized matching between the contact surfaces reduces the stress concentration of the second seal 500 and prolongs the service life of the second seal 500 and related components.

[0041] In summary, by designing the second contact surface 501 corresponding to the second wall surface 112 on the second seal 500 and providing the fitting surface 202 adapted thereto in the second mounting sleeve 200, the technical solution effectively enhances the reliability, dynamic adaptability and durability of the sealing assembly. At the same time, the supporting effect of the fitting surface 202 avoids the deviation and wear of the seal, providing a more stable and efficient solution for high-pressure fluid control. Its modular design also facilitates maintenance and application promotion at industrial sites, and has extremely high practical value.

[0042] like Figure 7-10 As shown, the third mounting groove 113 is provided with a second spring 600 and a mounting column 114, and the mounting column 114 and the sealing convex ring 11 are an integrally formed structure; Among them, one end of the second spring 600 is connected to the sliding sleeve 300, and the other end of the second spring 600 is sleeved with the mounting column 114. In this embodiment, the mounting column 114 and the sealing convex ring 11 are designed to be integrally formed to ensure the overall strength and accuracy of the structure. The mounting column 114 is used to mount one end of the second spring 600, and the other end of the second spring 600 is connected to the sliding sleeve 300, forming an elastic support system. This structural design allows the sliding sleeve 300 to always be subjected to the elastic action of the spring during movement, providing a stable return force.

[0043] like Fig.10 As shown, the sleeve 300 is provided with a first extrusion inclined surface 301, and the slider 400 is provided with a second extrusion inclined surface 401 adapted to the first extrusion inclined surface 301. In this embodiment, when the slider 400 moves under the action of fluid pressure, its second extrusion inclined surface 401 contacts the first extrusion inclined surface 301 of the sleeve 300 and generates an extrusion force. Through the design of the inclination angle of the inclined surface, the linear driving force of the slider 400 is converted into the axial movement of the sleeve 300, driving the second sealing member 500 to enter the second cavity 201, and the second contact surface 501 and the fitting surface 202 are fitted and sealed.

[0044] It should be noted that when the fluid pressure is reduced or released, the elastic action of the second spring 600 drives the sleeve 300 to reset, and the slider 400 also returns to the initial position. The mechanical characteristics of the inclined surface design make the slider 400 and the sleeve 300 move more smoothly when resetting, avoiding impact or jamming caused by reaction force.

[0045] In summary, through the cooperation of the extrusion slopes of the sleeve 300 and the slider 400, and the integrated design of the second spring 600 and the mounting column 114, the technical solution achieves efficient and reliable dynamic sealing. The slope design provides excellent mechanical conversion efficiency, and the support of the second spring 600 enhances the stability and reset ability of the component. The overall solution is suitable for complex working conditions such as high pressure and high frequency opening and closing, and has excellent technical performance and broad industrial application prospects.

[0046] like Figure 7-11As shown, the slider 400 is provided with at least one sealing sleeve 700, and the sealing sleeve 700 abuts against the inner wall of the third mounting groove 113. In the specific implementation process, the sealing sleeve 700 is arranged in an annular shape, and the sealing sleeve 700 is made of silicone or rubber. In this embodiment, the annular design of the sealing sleeve 700 ensures that it can form a stable sealing interface with the inner wall, and maintain a sealed state during the movement of the slider 400. The sealing sleeve 700 is made of silicone or rubber, which has excellent elasticity, pressure resistance and durability, and can effectively resist the erosion and wear of high-pressure fluid.

[0047] like Fig.10 As shown, a slide block 400 is provided with an anti-slip protrusion 402 on one side, and the anti-slip protrusion 402 and the slide block 400 are an integrally formed structure, and the anti-slip protrusion 402 is used to abut against the inner wall of the third mounting groove 113. In this embodiment, the anti-slip protrusion 402 abuts against the inner wall of the third mounting groove 113, and when the slide block 400 moves to the limit position, the anti-slip protrusion 402 plays a limiting role, preventing the slide block 400 from being separated from the third mounting groove 113, thereby ensuring the stable operation of the slide block 400 in the sealing system.

[0048] It should be noted that during the movement of the slider 400, the sealing sleeve 700 always keeps in contact with the inner wall of the third mounting groove 113, absorbs the fluid pressure through the flexibility and elastic deformation of the material, and forms a stable sealing interface. At the same time, the contact between the anti-slip protrusion 402 and the inner wall ensures that the movement trajectory of the slider 400 will not deviate, and provides additional limiting protection to prevent the slider 400 from coming out due to external force or fluid impact. Through the flexible contact between the sealing sleeve 700 and the inner wall, the direct friction between the slider 400 and the groove wall of the third mounting groove 113 is reduced, and mechanical wear is reduced. At the same time, through the limiting effect of the anti-slip protrusion 402, the excessive movement of the slider 400 is avoided, the sealing sleeve 700 and the slider 400 itself are protected, and the service life of the entire sealing system is extended. The elastic deformation of the sealing sleeve 700 can absorb part of the fluid pressure and impact force, and reduce the direct impact between the slider 400 and the inner wall of the third mounting groove 113. In addition, the limiting design of the anti-slip protrusion 402 further enhances the impact resistance of the system, and adapts to industrial working conditions with high pressure and frequent opening and closing.

[0049] Working principle: The present invention provides an eccentric butterfly valve, which specifically includes a valve body 10, a valve cover 20 and an actuator 30 connected in sequence. Through the cooperation of the first sealing surface 61 and the arc surface of the first wall surface 111, a uniform and stable contact seal can be achieved to avoid sealing failure due to local stress concentration; through the conical bevel design of the second sealing surface 62 and the second wall surface 112, the sealing performance is further optimized, and it can withstand higher fluid pressure and complex working conditions. Due to the eccentric design of the valve stem 40 and the disc plate 50, during the opening and closing process, the contact between the sealing ring 60 and the sealing convex ring 11 is gradually formed or released, avoiding direct impact and friction, significantly reducing the wear rate of the sealing ring 60, and thus extending the service life.

[0050] The eccentric design makes the disc plate 50 well controllable during the opening process, and can accurately control the contact area between the disc plate 50 and the fluid, thereby achieving precise regulation of the fluid flow rate, which is particularly suitable for industrial scenarios that require fine flow control. Due to the eccentric structure used in the sealing design, the disc plate 50 gradually reduces the contact force during the movement, especially when the initial opening requires a smaller torque. This design not only reduces the power consumption of the actuator 30, but also reduces the mechanical wear of the valve body 10.

[0051] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An eccentric butterfly valve, characterized in that: The eccentric butterfly valve is used to control the flow rate of a fluid medium. The eccentric butterfly valve comprises a valve body (10), a valve cover (20) and an actuator (30) which are connected in sequence. A sealing convex ring (11) is provided in the valve body (10). The valve body (10) is rotatably connected to a valve stem (40). A disc plate (50) is fixedly connected to the valve stem (40). A sealing ring (60) adapted to the sealing convex ring (11) is mounted on the disc plate (50). The sealing convex ring (11) is provided with a first wall surface (111) and a second wall surface (112) opposite to each other, and the sealing ring (60) is provided with a first sealing surface (61) and a second sealing surface (62) opposite to each other, the first sealing surface (61) is used for contact sealing with the first wall surface (111), and the second sealing surface (62) is used for contact sealing with the second wall surface (112); the first sealing surface (61) and the first wall surface (111) are both arc surfaces, and the second sealing surface (62) and the second wall surface (112) are both conical inclined surfaces; The actuator (30) is used to drive the valve stem (40) and the disc plate (50) to rotate synchronously so that the sealing ring (60) moves closer to or farther away from the sealing convex ring (11); the axis of the valve stem (40) and the axis of the disc plate (50) are offset.

2. The eccentric butterfly valve according to claim 1, characterized in that: The disc plate (50) is provided with a pressing plate (70) for pressing and fixing the sealing ring (60), and the disc plate (50) and the pressing plate (70) are fastened and connected by screws; Wherein, a mounting platform (51) is provided on the disc plate (50) and is arranged back to back with the pressure plate (70), and the mounting platform (51) is fixedly sleeved with the valve stem (40).

3. The eccentric butterfly valve according to claim 2, characterized in that: The disc plate (50) is provided with a first mounting groove (52), the pressure plate (70) is provided with a second mounting groove (71), and the sealing ring (60) is located between the first mounting groove (52) and the second mounting groove (71); The sealing ring (60) is provided with a first placement groove (63), the pressing plate (70) is provided with a second placement groove (72) corresponding to the first placement groove (63), and gaskets (80) are placed in the first placement groove (63) and the second placement groove (72).

4. The eccentric butterfly valve according to any one of claims 1 to 3, characterized in that: A first receiving groove (64) is provided in the sealing ring (60), a first installation sleeve (800) is placed in the first receiving groove (64), and a first cavity (801) is provided in the first installation sleeve (800); A first sealing member (90) and a first spring (100) are provided in the first cavity (801); one end of the first sealing member (90) abuts against the first sealing surface (61), and the other end of the first sealing member (90) is connected to the first spring (100).

5. The eccentric butterfly valve according to claim 4, characterized in that: The first sealing member (90) is provided with a first contact surface (91) adapted to the first wall surface (111), and an end surface of the first mounting sleeve (800) close to the first wall surface (111) is provided with a gap between the first wall surface (111).

6. The eccentric butterfly valve according to any one of claims 1 to 3, characterized in that: The sealing ring (60) is provided with a second receiving groove (65), a second mounting sleeve (200) is placed in the second receiving groove (65), a second cavity (201) is provided in the second mounting sleeve (200), and a third mounting groove (113) arranged in a T shape is provided in the sealing convex ring (11); The third installation groove (113) is provided with a sliding sleeve (300) and a sliding block (400) that abut against each other, the sliding sleeve (300) is embedded with a second sealing member (500), and the sliding block (400) is used to press the sliding sleeve (300) to move under the pressure of a fluid medium, so that the second sealing member (500) enters the second cavity (201).

7. The eccentric butterfly valve according to claim 6, characterized in that: A second spring (600) and a mounting column (114) are arranged in the third mounting groove (113); the mounting column (114) and the sealing convex ring (11) are an integrally formed structure; One end of the second spring (600) is connected to the sliding sleeve (300), and the other end of the second spring (600) is sleeved with the mounting column (114).

8. The eccentric butterfly valve according to claim 6, characterized in that: The sliding sleeve (300) is provided with a first extrusion inclined surface (301), and the sliding block (400) is provided with a second extrusion inclined surface (401) adapted to the first extrusion inclined surface (301).

9. The eccentric butterfly valve according to claim 6, characterized in that: The sliding block (400) is sleeved with at least one sealing sleeve (700), and the sealing sleeve (700) abuts against the inner wall of the third installation groove (113).

10. The eccentric butterfly valve according to claim 7, characterized in that: An anti-slip protrusion (402) is provided on one side of the sliding block (400); the anti-slip protrusion (402) and the sliding block (400) are an integrally formed structure; the anti-slip protrusion (402) is used to abut against the inner wall of the third mounting groove (113).

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