Double-geometric-circle four-eccentric structure of butterfly valve

Abstract

The invention discloses a double-geometric-circle four-eccentric structure of a butterfly valve. The double-geometric-circle four-eccentric structure is of a five-fold asymmetric structure. The first asymmetry is achieved through the offset between the rotating point of the valve clack and the center of the sealing face. The second asymmetry is embodied in that the center of the valve plate is perpendicular to the axis of the pipeline and deviates towards the pipe wall; the third asymmetry is formed by tangent circles of the sealing surface, and an included angle is formed between the connecting line of the highest points and the axis of the pipeline; and a fourth asymmetric double-circle structure replaces a section ellipse formed by common three-eccentric rotation, so that the sectional area is increased. And the fifth asymmetry is realized by forming an included angle between the circle and the center point of the circle and the axis of the pipeline. The sealing performance and the fluid control capability of the butterfly valve under high-pressure, high-temperature or corrosive working conditions can be remarkably improved, abrasion is reduced, the service life is prolonged, and the butterfly valve is suitable for complex industrial fluid control scenes.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fluid control equipment, specifically a butterfly valve for controllable fluid flow. BACKGROUND

[0002] As an important fluid control device, butterfly valves are widely used in industries such as petroleum, chemical, power, and water treatment. Traditional butterfly valves usually adopt a symmetrical structure design, with the center of rotation of the valve disc coinciding with the center of the sealing surface, and the geometric center of the valve plate usually located on the pipeline axis. Although this symmetrical structure meets the basic fluid control requirements to some extent, it often shows insufficient sealing performance, short service life, and low fluid control precision under high pressure, high temperature, or high sealing requirements. In addition, traditional butterfly valves tend to produce large torque fluctuations during opening and closing, increasing the burden on the drive system and limiting their application range in complex working conditions. The double circular structure replaces the ordinary three eccentric rotation to form a cross-sectional ellipse, increasing the cross-sectional area.

[0003] In recent years, eccentric structure butterfly valves have gradually become a research hotspot. By introducing single or double eccentricity and ordinary three eccentric design, the sealing performance and operating stability of traditional butterfly valves have been partially improved. However, these improvements still have limitations, especially in terms of multi-working condition adaptability and fluid dynamic control. For example, existing eccentric butterfly valves usually only have single or double asymmetric features, making it difficult to meet the requirements of high sealing, low operating torque, and excellent fluid regulation performance. In addition, the design of the sealing surface in existing technology is mostly based on simple geometric shapes, lacking sufficient consideration of complex fluid dynamics, resulting in significant performance degradation of the valve under high pressure difference or bidirectional fluid action.

[0004] To address the above problems, there is an urgent need for a butterfly valve structure that can break through the limitations of traditional design to achieve higher sealing reliability, better fluid control ability, and stronger working condition adaptability. The present application proposes a double-geometric circular four-eccentric structure butterfly valve with five asymmetric features. By offsetting the rotation point of the valve disc and the center of the sealing surface, designing the center of the valve plate relative to the pipeline axis, using a unique sealing surface geometry composed of two tangent circles, and optimizing the configuration of related angle parameters, the double circular structure replaces the ordinary three eccentric rotation to form a cross-sectional ellipse, increasing the cross-sectional area. This significantly improves the overall performance of the butterfly valve. This design not only solves the sealing problem of traditional butterfly valves under high pressure and high temperature conditions, but also effectively reduces the operating torque and improves the fluid control precision, providing an innovative solution for the industrial fluid control field. SUMMARY

[0005] The present application aims at the deficiencies of existing butterfly valves in sealing performance and fluid control ability, and proposes a technical scheme of a butterfly valve with five asymmetric structures. The butterfly valve realizes significant improvement in sealing performance and fluid control ability through unique structural design, and is especially suitable for fluid control requirements under high pressure, high temperature or corrosive fluid working conditions.

[0006] The present application provides a butterfly valve double-geometric circular four-eccentric structure, which has five levels of asymmetric design. The first asymmetry is achieved by setting an offset A between the rotation point of the valve disc and the center of the sealing surface. The specific implementation of the offset is to translate the rotation axis of the valve disc relative to the geometric center of the sealing surface in a certain direction by a distance A, wherein the value of A is set according to the diameter of the sealing surface and the material properties in the actual working condition. This offset design makes the valve disc always approach or leave the sealing surface in an asymmetric way during rotation, avoiding the uneven sealing problem caused by the symmetric structure of traditional butterfly valves. Further, since the valve disc does not directly align with the center of the sealing surface when opening or closing, the excessive wear of the local area of the sealing surface is effectively reduced, thereby prolonging the service life of the sealing element.

[0007] Further, the second asymmetry of the present application is reflected in the spatial position design of the valve plate center relative to the pipeline axis. Specifically, the geometric center of the valve plate is offset by a distance B in the direction of the pipe wall perpendicular to the pipeline axis. The distance B is set according to the valve plate thickness, the pipeline inner diameter and the physical properties of the fluid medium. Through this offset design, the valve plate presents an asymmetric spatial posture during opening or closing, thereby changing the force distribution of the fluid on the valve plate. In particular, when the fluid flows from one end of the pipeline, the asymmetric position of the valve plate can guide the fluid to flow along a specific path, reducing the direct impact of the fluid on the front of the valve plate, thereby reducing the destructive effect of fluid impact on the valve plate. In addition, this design also enhances the controllability of fluid flow, enabling the butterfly valve to more accurately regulate fluid flow in a partially open state.

[0008] The third asymmetry of the present application is concentrated in the geometric shape design of the sealing surface. The sealing surface is composed of two tangent geometric circles, namely the first circle and the second circle. The first circle and the second circle are tangent at the straight edge, and the line connecting the highest points of the two circles forms an angle C with the center line of the straight edge and the pipeline axis. The specific value of the angle C is calculated by the curvature radius of the sealing surface, the pipeline inner diameter and the fluid pressure parameters. Through this geometric shape design, the sealing surface presents obvious asymmetry in space, optimizing the contact characteristics between the sealing surface and the valve plate. In particular, when the valve plate is in contact with the sealing surface in the closed state, the asymmetric curvature distribution of the sealing surface can make the contact pressure more uniformly distributed on the sealing surface, thereby improving the sealing effect and reducing the local stress concentration phenomenon.

[0009] The fourth asymmetricity of the present application replaces the cross-sectional ellipse formed by ordinary three-eccentric rotation with a double-circle structure, thereby increasing the cross-sectional area.

[0010] Further, the fifth asymmetry of the present application is achieved by the included angle D formed between the center point of the first circle and the center point of the second circle relative to the pipeline axis. The specific implementation of the included angle D is as follows: first, determine the geometric center positions of the first circle and the second circle, and then adjust the relative position relationship of the two to form a fixed angle D with the pipeline axis. The value range of the angle D is optimized according to the geometric size of the sealing surface and the fluid working condition parameters. Through this design, the entire butterfly valve structure can maintain excellent sealing performance and fluid control ability at different rotation angles. In particular, when the valve plate is in a partially open state, the asymmetric geometry of the sealing surface can guide the fluid to flow in a specific direction, thereby further enhancing the controllability of fluid flow.

[0011] The technical solution of the present application achieves the following specific technical effects through the synergistic effect of the above-mentioned five asymmetries: S1. improves the sealing performance, especially the sealing reliability under high pressure, high temperature or corrosive fluid working conditions. Specifically, through the first and third asymmetry designs, the contact pressure distribution between the sealing surface and the valve plate is more uniform, thereby reducing the excessive wear of the local area of the sealing surface; S2. enhances the controllability of fluid flow, which can accurately adjust the fluid flow. Through the second and fourth asymmetry designs, the valve plate can guide the fluid to flow along a specific path during opening or closing, thereby achieving accurate control of fluid flow; S3. reduces the impact and wear of fluid on the valve body, prolonging the service life of the butterfly valve. In particular, through the second asymmetry design, the impact force of the fluid on the valve plate is effectively dispersed, thereby reducing the fatigue damage of the valve plate; S4. the double-circle structure replaces the cross-sectional ellipse formed by ordinary three-eccentric rotation, thereby increasing the cross-sectional area. Improving the pressure resistance and sealing performance. S5. provides a high-performance butterfly valve solution suitable for complex working conditions. Through the comprehensive design of the five asymmetries, the butterfly valve of the present application can maintain stable performance under various complex working conditions.

[0012] In summary, the present invention solves the shortcomings of traditional butterfly valves in terms of sealing and fluid control by introducing a five-fold asymmetric structural design. In particular, the present invention achieves a comprehensive improvement in sealing performance and fluid control capabilities through the careful design of the valve disc rotation point, the center position of the valve plate, the geometric shape of the sealing surface, and the relative position of the circular center point. Since the cross-section of the existing butterfly valve is elliptical, the force-bearing area at certain angles is small. This patent designs the cross-section to be circular, which can fully ensure the uniformity of the force-bearing surface. At the same time, the force-bearing area is large and the pressure-bearing capacity is large. It can adapt to both high and low temperature environments, and the sealing effect will be better. This design not only improves the overall performance of the butterfly valve, but also provides an innovative technical solution for the field of industrial fluid control, which has important application value and market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention, showing the five-fold asymmetric structural design of the butterfly valve.

[0015] The accompanying drawings are numbered as follows:

[0016] A. The offset between the disc rotation point and the sealing surface center;

[0017] B. The offset of the valve plate center from the vertical pipeline axis to the pipe wall;

[0018] C. The angle formed by the line connecting the highest points of the first and second circles, the center line of the straight edge, and the axis of the pipe;

[0019] D. the angle formed by the center point of the first circle and the center point of the second circle relative to the pipeline axis;

[0020] 10. A first geometric circle constituting a sealing surface;

[0021] 11. A second geometric circle forming the sealing surface. DETAILED DESCRIPTION

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] The present invention realizes a high performance butterfly valve by introducing a five-fold asymmetric structural design. Figure 1 Detailed description is given. Figure 1The present application is a schematic diagram of the overall structure, which shows the five-fold asymmetric configuration design of the butterfly valve and the specific location and relationship of its key components. The technical solution of the present application will be elaborated in detail from the aspects of structural design, operating principle and practical application scenarios.

[0024] In practical applications, the butterfly valve of the present application is mainly composed of a valve body, a valve plate, a valve flap rotation point and a sealing surface. The relative positions and geometric shapes between the components are precisely designed to achieve the function of five-fold asymmetric configuration. First, the first asymmetry is achieved by the offset A between the valve flap rotation point and the center of the sealing surface. Specifically, the rotation axis of the valve flap is translated a distance A relative to the geometric center of the sealing surface in a certain direction. In the embodiment, the offset A is usually in the range of 5 to 20 mm, and the specific value is determined according to the sealing surface diameter and material properties. For example, in a high-pressure working condition, if the sealing surface diameter is 300 mm and high-temperature-resistant alloy is used as the sealing material, the offset A can be set to 15 mm. This design makes the valve flap always approach or leave the sealing surface in an asymmetric way during rotation, avoiding the uneven sealing problem caused by the symmetric structure of traditional butterfly valves. In addition, since the valve flap does not directly align with the center of the sealing surface when opening or closing, the excessive wear of the local area of the sealing surface is significantly reduced, thereby prolonging the service life of the sealing element.

[0025] The second asymmetry is reflected in the spatial position design of the valve plate center relative to the pipeline axis. In the embodiment, the geometric center of the valve plate is offset a distance B in the direction of the pipe wall perpendicular to the pipeline axis. The distance B is usually in the range of 10 to 30 mm, depending on the valve plate thickness, pipeline inner diameter and physical properties of the fluid medium. For example, in a pipeline with an inner diameter of 400 mm, if the valve plate thickness is 20 mm and the fluid medium is a corrosive liquid, the offset B can be set to 25 mm. Through this design, the valve plate presents an asymmetric spatial posture during opening or closing, changing the force distribution of the fluid on the valve plate. When the fluid flows from one end of the pipeline, the asymmetric position of the valve plate guides the fluid to flow along a specific path, reducing the direct impact of the fluid on the front of the valve plate, thereby reducing the destructive effect of fluid impact on the valve plate. In addition, this design also enhances the controllability of fluid flow, enabling the butterfly valve to more accurately regulate fluid flow in a partially open state.

[0026] The third asymmetry is concentrated in the geometric shape design of the sealing surface, which is composed of two tangent geometric circles, namely the first circle and the second circle. In the attached drawings, the first circle is represented by the dashed line, and the second circle is represented by the solid line. The first circle is the sealing surface of the valve plate, and the second circle is the sealing surface of the valve body. The two circles are tangent to each other at the sealing surface center, and the first circle is offset from the second circle by a distance C. In the embodiment, the offset C is usually in the range of 5 to 20 mm, and the specific value is determined according to the sealing surface diameter and material properties. For example, in a high-pressure working condition, if the sealing surface diameter is 300 mm and high-temperature-resistant alloy is used as the sealing material, the offset C can be set to 15 mm. This design makes the valve flap always approach or leave the sealing surface in an asymmetric way during rotation, avoiding the uneven sealing problem caused by the symmetric structure of traditional butterfly valves. In addition, since the valve flap does not directly align with the center of the sealing surface when opening or closing, the excessive wear of the local area of the sealing surface is significantly reduced, thereby prolonging the service life of the sealing element. Figure 1In some embodiments, the first circle and the second circle are tangent at the straight edge, and the line connecting the highest points of the two circles forms an angle C with the centerline of the straight edge and the pipe axis. The specific value of the angle C is calculated based on the curvature radius of the sealing surface, the inner diameter of the pipe, and the fluid pressure parameters. For example, in a high-pressure working condition, if the curvature radius of the sealing surface is 150 mm and the inner diameter of the pipe is 500 mm, the angle C can be set to 30 degrees. Through this geometric design, the sealing surface exhibits obvious asymmetry in space, optimizing the contact characteristics between the sealing surface and the valve plate. When the valve plate is in contact with the sealing surface in the closed state, the asymmetric curvature distribution of the sealing surface makes the contact pressure more uniformly distributed on the sealing surface, thereby improving the sealing effect and reducing local stress concentration. In addition, this design also improves the adaptability of the sealing surface under complex working conditions, enabling it to maintain stable performance in high-temperature, high-pressure, or corrosive environments.

[0027] The fourth asymmetry replaces the cross-sectional elliptical shape formed by ordinary three-eccentric rotation with a double-circle structure, increasing the cross-sectional area.

[0028] The fifth asymmetry is achieved by the angle D formed between the center point of the first circle and the center point of the second circle relative to the pipe axis. In embodiments, the geometric center positions of the first circle and the second circle are first determined, and then their relative position relationship is adjusted to form a fixed angle D with the pipe axis. The angle D typically ranges from 20 degrees to 60 degrees, and the specific value is optimized based on the geometric dimensions of the sealing surface and the fluid working condition parameters. For example, in a corrosive fluid working condition, if the geometric dimensions of the sealing surface are 400 mm x 300 mm and the fluid pressure is 5 MPa, the angle D can be set to 45 degrees. Through this design, the entire butterfly valve structure can maintain excellent sealing performance and fluid control ability at different rotation angles. In particular, when the valve plate is in a partially open state, the asymmetric geometry of the sealing surface guides the fluid to flow in a specific direction, further enhancing the controllability of fluid flow.

[0029] In actual operation, the butterfly valve of the present application realizes excellent performance through the synergistic effect of the above-mentioned five asymmetric structures. S1, when the valve plate gradually rotates from the fully open state to the closed state, the offset A between the valve disc rotation point and the center of the sealing surface ensures that the valve plate approaches the sealing surface in an asymmetric manner, reducing the excessive wear of the local area of the sealing surface. S2, the offset B of the valve plate center relative to the pipeline axis changes the force distribution of the fluid on the valve plate, reduces the impact force of the fluid on the valve plate, and at the same time enhances the controllability of fluid flow. S3, the asymmetric geometry of the sealing surface optimizes the contact characteristics between the sealing surface and the valve plate, making the contact pressure more evenly distributed on the sealing surface, thereby improving the sealing effect and reducing the local stress concentration phenomenon. S4, the angle D formed by the center points of the first and second circles relative to the pipeline axis further enhances the controllability of fluid flow, enabling the butterfly valve to more accurately regulate fluid flow in a partially open state.

[0030] The butterfly valve of the present application is suitable for a variety of complex working conditions, especially in high pressure, high temperature or corrosive fluid working conditions. For example, in the petrochemical industry, the butterfly valve of the present application can be used to control the flow of high temperature steam. In this application scenario, the sealing surface of the butterfly valve is made of high temperature resistant alloy material, the offset A is set to 15 mm, the offset B is set to 25 mm, the angle C is set to 30 degrees, and the angle D is set to 45 degrees. Through this design, the butterfly valve can maintain stable sealing performance and fluid control ability under high temperature steam working conditions, effectively reducing the wear of the sealing surface and prolonging the service life. In addition, in the sewage treatment industry, the butterfly valve of the present application can be used to control the flow of corrosive sewage. In this application scenario, the sealing surface of the butterfly valve is made of corrosion resistant material, the offset A is set to 10 mm, the offset B is set to 20 mm, the angle C is set to 25 degrees, and the angle D is set to 40 degrees. Through this design, the butterfly valve can maintain excellent sealing performance and fluid control ability under corrosive sewage working conditions, meeting the demand of the sewage treatment industry for high performance butterfly valve.

[0031] In summary, the present application solves the deficiencies of traditional butterfly valves in sealing and fluid control by introducing a five-fold asymmetric structure design. Through fine design of the valve disc rotation point, valve plate center position, sealing surface geometry and relative position of the circular center points, the sealing performance and fluid control ability are comprehensively improved. This design not only improves the overall performance of the butterfly valve, but also provides an innovative technical solution for the industrial fluid control field, with important application value and market prospect.

[0032] The preferred embodiments of the application disclosed above are only to facilitate the elucidation of the application. The preferred embodiments do not describe all the details of the application and limit the application to the specific embodiments described. Obviously, many modifications and variations can be made in light of the teachings above. The description is chosen and described in order to best explain the principles of the application and its practical application to thereby enable others skilled in the art to best utilize the application and get the best results from the application. The application is only limited by the claims and their full scope and equivalents.

Claims

1. Butterfly valve double geometry circular four-eccentric structure, characterized in that The valve body includes a valve plate sealing surface and a valve disc rotation point, the valve disc rotation point is provided with an offset A from the center of the sealing surface, the geometric center of the valve plate is offset by a distance B in the direction perpendicular to the pipeline axis, the sealing surface is composed of two tangent geometric circles, a first circle (10) and a second circle (11), the highest point of the first circle and the second circle forms an angle C with the center line of the straight edge and the pipeline axis, the center point of the first circle and the center point of the second circle form an angle D with the pipeline axis.

2. The butterfly valve double geometry circular four eccentric structure as claimed in claim 1, wherein The offset A is in the range of 5mm to 20mm.

3. The butterfly valve double geometry circular four eccentric structure as claimed in claim 2, wherein The offset A is determined according to the sealing surface diameter and material characteristics.

4. The butterfly valve double geometry circular four eccentric structure as claimed in claim 1, wherein The offset B is in the range of 10mm to 30mm.

5. The butterfly valve double geometry circular four eccentric structure as claimed in claim 4, wherein The offset B is determined according to the valve plate thickness, the pipeline inner diameter and the physical characteristics of the fluid medium.

6. The butterfly valve dual geometry circular four eccentric structure as claimed in claim 1, wherein The angle C is in the range of 20 degrees to 60 degrees.

7. The butterfly valve double geometry circular four eccentric structure as claimed in claim 6, wherein The angle C (C) is calculated according to the curvature radius of the sealing surface, the pipeline inner diameter and the fluid pressure parameters.

8. The butterfly valve dual geometry circular four eccentric structure as claimed in claim 1, wherein The angle D is in the range of 20 degrees to 60 degrees.

9. The butterfly valve double geometry circular four eccentric structure as claimed in claim 8, wherein The angle D is optimized according to the geometric size of the sealing surface and the fluid working condition parameters.

10. The butterfly valve dual geometry circular four eccentric structure as claimed in claim 1, wherein The sealing material, part of the sealing surface is made of high-temperature resistant alloy or corrosion-resistant material.

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