Valve plate sealing structure of three-eccentric center butterfly valve

Abstract

The utility model relates to the technical field of butterfly valves, in particular to a valve plate sealing structure of a three-eccentric center butterfly valve. According to the technical scheme, the valve comprises a valve body, and an actuator is installed at the top end of the valve body; a hand wheel is mounted on the actuator; a valve plate is rotationally installed in the valve body, and a fixing base is arranged on the back face of the valve plate. The number of the fixing seats is two, and the two fixing seats are symmetrically distributed on the valve plate. A rotating shaft is installed in the actuator, the valve plate is in transmission connection with the actuator through the rotating shaft, and the valve plate is rotationally installed in the valve body through the rotating shaft; a pressing plate is installed at the end, away from the fixing base, of the valve plate through a bolt, and a second sealing ring is clamped and fixed between the pressing plate and the valve plate. The valve plate is in an eccentric circular truncated cone shape, and the pressing plate and the second sealing ring are matched with the valve plate in shape. The three-eccentric structure enables the valve plate to be opened and closed without friction, the easy-to-disassemble pressing plate and the matched sealing ring are matched, the sealing performance is remarkably improved, the service life is prolonged, and maintenance is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, in particular to a valve plate sealing structure of a triple-eccentric butterfly valve. Background Art

[0002] In the field of industrial production, valves, as key equipment for controlling fluid flow, are widely used in many industries such as petroleum, chemical, electric power, water conservancy, and pharmaceuticals.

[0003] Traditional valves experience friction between the sealing surfaces during opening and closing. Over time, these surfaces gradually wear out, leading to a decrease in sealing performance. For example, in butterfly valves, the sealing surface between the disc and seat in frequent opening and closing can develop scratches, wear, and other defects due to friction, making it easy for media to leak. This not only affects the valve's proper operation but also causes energy waste and environmental pollution. For industries with extremely high sealing requirements, such as the chemical and pharmaceutical industries, it can even lead to product quality failures, resulting in significant economic losses for the company. Existing valve sealing structures mostly use a single sealing method, such as relying solely on a direct seal between the disc and seat or a single sealing ring on the valve body. This single sealing structure often struggles to maintain a good seal under complex operating conditions. For example, under high-pressure operating conditions, the media pressure exerts significant impact on the sealing surface, and the single sealing structure may not be able to withstand this pressure, leading to media leakage. In operating conditions involving corrosive media, the sealing material is easily corroded, reducing sealing performance. Furthermore, when the sealing structure is damaged, repairing and replacing the seal is often difficult, requiring significant time and labor. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a valve plate sealing structure for a triple-eccentric butterfly valve, which solves the problems raised in the background art.

[0005] The utility model solves the above-mentioned technical problems as follows:

[0006] A valve plate sealing structure for a triple-eccentric butterfly valve, comprising:

[0007] A valve body, wherein an actuator is installed on the top end of the valve body;

[0008] A handwheel is installed on the actuator;

[0009] A valve plate is rotatably mounted in the valve body, and a fixing seat is provided on the back of the valve plate;

[0010] There are two fixing seats in total, and the two fixing seats are symmetrically distributed on the valve plate;

[0011] A rotating shaft is installed in the actuator, the valve plate is connected to the actuator through the rotating shaft, and the valve plate is rotatably installed in the valve body through the rotating shaft;

[0012] A pressure plate is mounted on one end of the valve plate away from the fixing seat via bolts, and a second sealing ring is clamped and fixed between the pressure plate and the valve plate;

[0013] The valve plate is in an eccentric cone shape, and the pressure plate and the second sealing ring are adapted to the shape of the valve plate.

[0014] On the basis of the above technical solution, the present invention can also be improved as follows.

[0015] Furthermore, a first sealing ring adapted to the valve plate is installed on the inner wall of the valve body.

[0016] The beneficial effects of adopting the above further scheme are:

[0017] When the valve plate is in the closed state, the first sealing ring can fit tightly against the valve plate, forming a reliable sealing barrier, effectively preventing the medium from leaking from the gap between the valve plate and the valve body, greatly enhancing the overall sealing performance of the valve, and ensuring that the valve can reliably cut off the flow of the medium under various working conditions, meeting the use scenarios with higher sealing requirements.

[0018] Furthermore, a plurality of threaded holes are provided on the surface of the pressure plate, mounting holes are provided on the valve plate at positions corresponding to the threaded holes, and the bolts pass through the mounting holes and are threadedly connected to the threaded holes.

[0019] The beneficial effects of adopting the above further scheme are:

[0020] This connection method makes the installation and removal of the pressure plate and valve plate extremely convenient. When the second sealing ring needs to be replaced or maintained, simply loosen the bolts, remove the pressure plate, and replace the sealing ring easily. No complicated tools or tedious steps are required, which greatly shortens maintenance time and costs, and improves the efficiency and maintainability of the valve.

[0021] Furthermore, the actuator is any one of an electric actuator, a pneumatic actuator or a hydraulic actuator, and a clutch is provided between the handwheel and the actuator for switching between automatic control mode and manual control mode.

[0022] The beneficial effects of adopting the above further scheme are:

[0023] It provides flexible and diverse control methods. During normal production, electric, pneumatic, or hydraulic actuators can be selected for automatic control according to actual needs, achieving precise and rapid opening and closing of the valve to meet the requirements of automated production. When the automatic control system fails or manual debugging or emergency operation is required, the clutch can quickly switch to manual control mode, and the valve can be operated by turning the handwheel, ensuring reliable operation of the valve in various situations and improving production safety and stability.

[0024] Furthermore, the sealing surface of the valve plate is an eccentric cone structure, and its busbar and the center line of the rotating shaft form a three-eccentric structure. The three-eccentric structure includes: radial eccentricity between the center line of the rotating shaft and the center of the valve plate sealing surface; axial eccentricity between the center line of the rotating shaft and the center line of the valve body flow channel; and angular eccentricity between the conical busbar of the valve plate sealing surface and the center line of the rotating shaft.

[0025] The beneficial effects of adopting the above further scheme are:

[0026] The triple-eccentric structure enables frictionless rotation between the sealing surfaces of the valve disc during opening and closing. When opening, the sealing surfaces quickly separate, eliminating the wear and tear caused by friction between the sealing surfaces during the opening and closing process of traditional valves, significantly extending the valve's service life. This structure also ensures excellent sealing performance when the valve is closed, improving valve reliability and stability and reducing production interruptions and losses caused by valve failure.

[0027] Furthermore, a sealing ring installation groove is formed between the pressure plate and the valve plate, and the cross-section of the second sealing ring is trapezoidal, with its large end arranged toward the medium pressure direction.

[0028] The beneficial effects of adopting the above further scheme are:

[0029] When medium pressure acts on the second seal ring, the trapezoidal cross-section design causes the larger end of the second seal ring to fit more tightly against the seal ring mounting groove and the corresponding part of the valve body, thereby enhancing the sealing effect. This structure can automatically adjust the sealing degree according to the medium pressure, maintaining good sealing performance even under high-pressure conditions, effectively preventing medium leakage, and improving the adaptability and reliability of the valve under different pressure conditions.

[0030] The utility model provides a valve plate sealing structure for a triple eccentric butterfly valve. It has the following beneficial effects:

[0031] The disc's sealing surface generatrix and the shaft centerline form a triple-eccentric structure: radial eccentricity between the shaft centerline and the disc's sealing surface center, axial eccentricity between the shaft centerline and the valve body's flow path centerline, and angular eccentricity between the disc's tapered sealing surface generatrix and the shaft centerline. This unique design eliminates friction between the disc's sealing surfaces during opening and closing. Compared to traditional butterfly valves, this reduces friction-induced wear on the sealing surface, significantly extending the valve's service life and reducing maintenance costs and replacement frequency.

[0032] A first sealing ring, compatible with the valve disc, is mounted on the inner wall of the valve body. When the valve disc is closed, the first sealing ring fits tightly against the disc, forming a primary sealing barrier. This effectively prevents leakage of the medium through the gap between the disc and the body, ensuring the valve's sealing reliability when closed. A second sealing ring is secured to the disc via a pressure plate and bolts. A sealing ring mounting groove is formed between the pressure plate and the disc. The second sealing ring has a trapezoidal cross-section, with the larger end oriented in the direction of the medium pressure. When medium pressure is applied, the second sealing ring fits more tightly into the sealing position, forming a secondary sealing barrier and further enhancing the valve's sealing performance. This makes it particularly suitable for applications requiring high sealing requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0034] In the attached figure:

[0035] Figure 1 This is a schematic diagram of the rear view of the present invention;

[0036] Figure 2 This is a front view schematic diagram of the utility model;

[0037] Figure 3 This is a schematic diagram of the appearance of the valve plate of the present utility model;

[0038] Figure 4 This is a schematic diagram of the cross-sectional structure of the valve plate of the present invention.

[0039] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0040] 1. Valve body; 101. First sealing ring; 2. Actuator; 201. Handwheel; 3. Valve plate; 301. Rotating shaft; 302. Fixed seat; 303. Pressing plate; 304. Second sealing ring. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0042] See also Figures 1 to 4 As shown, the embodiment provided by the utility model:

[0043] Embodiment 1: A valve plate sealing structure of a triple-eccentric butterfly valve, comprising:

[0044] Valve body 1, with actuator 2 installed on the top of valve body 1;

[0045] A hand wheel 201 is mounted on the actuator 2;

[0046] A valve plate 3 is rotatably mounted in the valve body 1, and a fixing seat 302 is provided on the back of the valve plate 3;

[0047] There are two fixing seats 302 in total, and the two fixing seats 302 are symmetrically distributed on the valve plate 3;

[0048] A rotating shaft 301 is installed in the actuator 2, and the valve plate 3 is connected to the actuator 2 through the rotating shaft 301. The valve plate 3 is rotatably installed in the valve body 1 through the rotating shaft 301;

[0049] A pressure plate 303 is mounted on one end of the valve plate 3 away from the fixing seat 302 via bolts, and a second sealing ring 304 is clamped and fixed between the pressure plate 303 and the valve plate 3;

[0050] The valve plate 3 is in the shape of an eccentric cone, and the pressure plate 303 and the second sealing ring 304 are adapted to the shape of the valve plate 3 .

[0051] Example 2: In order to achieve flexible switching of valve control modes and meet the operational requirements in different production scenarios, for example, Figures 1 to 4 As shown, the utility model also includes:

[0052] Actuator 2 is any of the electric, pneumatic, or hydraulic actuators of this embodiment, and a clutch is provided between handwheel 201 and actuator 2 for switching between automatic and manual control modes, providing flexible and diverse control methods. During normal production, electric, pneumatic, or hydraulic actuator 2 can be selected for automatic control based on actual needs, achieving precise and rapid opening and closing of the valve, meeting the requirements of automated production. If the automatic control system fails or manual debugging or emergency operation is required, the clutch can be used to quickly switch to manual control mode, and the valve can be operated by turning handwheel 201. This ensures reliable operation of the valve in various situations and improves production safety and stability.

[0053] Example 3: In order to improve the comprehensive performance of the valve, including extending the service life, improving the sealing effect, facilitating maintenance and enhancing adaptability, for example, Figures 1 to 4 As shown, the utility model also includes:

[0054] The sealing surface of valve plate 3 is an eccentric conical structure, with its generatrix and the centerline of shaft 301 forming a triple-eccentric structure. This triple-eccentric structure includes: radial eccentricity between the shaft centerline and the center of the valve plate sealing surface; axial eccentricity between the shaft centerline and the valve body flow channel centerline; and angular eccentricity between the conical generatrix of the valve plate sealing surface and the shaft centerline. This triple-eccentric structure enables frictionless rotation between the sealing surfaces of valve plate 3 during opening and closing. During opening, the sealing surfaces quickly disengage, avoiding the wear caused by friction between the sealing surfaces during the opening and closing of traditional valves, significantly extending the service life of the valve. This structure also ensures excellent sealing performance when the valve is closed, improving valve reliability and stability and reducing production interruptions and losses caused by valve failure. The surface of pressure plate 303 is provided with multiple threaded holes, and mounting holes are provided on valve plate 3 at locations corresponding to the threaded holes. Bolts pass through the mounting holes and thread into the threaded holes. This connection method makes installation and removal of pressure plate 303 and valve plate 3 extremely convenient. When the second sealing ring 304 needs to be replaced or maintained, simply loosen the bolts and easily remove the pressure plate 303 to complete the sealing ring replacement operation. This eliminates the need for complex tools and tedious steps, significantly shortening maintenance time and costs, and improving the valve's efficiency and maintainability. A sealing ring mounting groove is formed between the pressure plate 303 and the valve plate 3. The second sealing ring 304 has a trapezoidal cross-section, with its larger end facing the direction of the medium pressure. When the medium pressure acts on the second sealing ring 304, due to the trapezoidal cross-section design, the medium pressure causes the larger end of the second sealing ring 304 to fit more tightly between the sealing ring mounting groove and the corresponding portion of the valve body 1, thereby enhancing the sealing effect. This structure can automatically adjust the sealing degree according to the medium pressure, maintaining good sealing performance even under high-pressure conditions, effectively preventing medium leakage, and improving the valve's adaptability and reliability under different pressure conditions. A first sealing ring 101 that is compatible with the valve plate 3 is installed on the inner wall of the valve body 1. When the valve plate 3 is in a closed state, the first sealing ring 101 can fit tightly with the valve plate 3 to form a reliable sealing barrier, effectively preventing the medium from leaking from the gap between the valve plate 3 and the valve body 1, greatly enhancing the overall sealing performance of the valve, ensuring that the valve can reliably cut off the flow of the medium under various working conditions, and meeting the use scenarios with higher sealing requirements.

[0055] Working principle:

[0056] The operator can switch between automatic and manual control modes using the clutch according to actual needs. If automatic control is selected, the electric actuator 2, pneumatic actuator 2, or hydraulic actuator 2 receives an external control signal and drives the internal rotating shaft 301 to rotate. If manual control is selected, turning the handwheel 201 drives the relevant internal structures of the actuator 2, thereby rotating the rotating shaft 301.

[0057] The rotation of the rotating shaft 301 drives the valve disc 3 to rotate within the valve body 1. Because the valve disc 3 is shaped like an eccentric cone, and the generatrix of its sealing surface forms a triple-eccentric structure with the centerline of the rotating shaft 301 (radial eccentricity between the centerline of the rotating shaft 301 and the center of the valve disc 3 sealing surface, axial eccentricity between the centerline of the rotating shaft 301 and the centerline of the flow channel of the valve body 1, and angular eccentricity between the conical generatrix of the valve disc 3 sealing surface and the centerline of the rotating shaft 301), this unique triple-eccentric structure enables frictionless rotation between the sealing surfaces of the valve disc 3 during opening and closing. When the valve disc 3 rotates to the open position, the medium can flow through the flow channel of the valve body 1. When the valve disc 3 rotates to the closed position, the sealing structure between the valve disc 3 and the valve body 1 begins to function.

[0058] A first sealing ring 101 adapted to the valve plate 3 is installed on the inner wall of the valve body 1. When the valve plate 3 is closed, the first sealing ring 101 fits tightly against the valve plate 3 to prevent the medium from leaking from the gap between the valve plate 3 and the valve body 1.

[0059] A pressure plate 303 is bolted to the end of the valve plate 3 facing away from the mounting seat 302. A sealing ring mounting groove is formed between the pressure plate 303 and the valve plate 3, and a second sealing ring 304 is clamped and secured within the groove. The second sealing ring 304 has a trapezoidal cross-section, with its larger end facing the direction of the medium pressure. When the medium pressure acts on the second sealing ring 304, the pressure causes the larger end of the second sealing ring 304 to fit more tightly between the sealing ring mounting groove and the corresponding portion of the valve body 1, thereby enhancing the sealing effect and preventing medium leakage from within the valve plate 3.

[0060] Two symmetrically distributed fixing seats 302 are provided on the back of the valve plate 3 to enhance the structural stability of the valve plate 3. The surface of the pressure plate 303 is provided with multiple threaded holes, and corresponding mounting holes are provided on the valve plate 3. Bolts pass through the mounting holes and thread into the threaded holes, firmly attaching the pressure plate 303 to the valve plate 3. This ensures that the second sealing ring 304 is stably fixed between the valve plate 3 and the pressure plate 303, maintaining good sealing performance.

[0061] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0062] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A valve plate sealing structure for a triple eccentric butterfly valve, characterized in that: include: A valve body (1), wherein an actuator (2) is mounted on the top end of the valve body (1); A handwheel (201) is mounted on the actuator (2); A valve plate (3) is rotatably mounted in the valve body (1), and a fixing seat (302) is provided on the back side of the valve plate (3); There are two fixing seats (302) in total, and the two fixing seats (302) are symmetrically distributed on the valve plate (3); A rotating shaft (301) is installed in the actuator (2), the valve plate (3) is transmission-connected to the actuator (2) via the rotating shaft (301), and the valve plate (3) is rotatably installed in the valve body (1) via the rotating shaft (301); A pressure plate (303) is mounted on one end of the valve plate (3) away from the fixing seat (302) via bolts, and a second sealing ring (304) is clamped and fixed between the pressure plate (303) and the valve plate (3); The valve plate (3) is in the shape of an eccentric cone, and the pressure plate (303) and the second sealing ring (304) are adapted to the shape of the valve plate (3).

2. The valve plate sealing structure of a triple eccentric butterfly valve according to claim 1, characterized in that: A first sealing ring (101) adapted to the valve plate (3) is mounted on the inner wall of the valve body (1).

3. The valve plate sealing structure of a triple eccentric butterfly valve according to claim 1, characterized in that: A plurality of threaded holes are provided on the surface of the pressure plate (303), mounting holes are provided on the valve plate (3) at positions corresponding to the threaded holes, and the bolts pass through the mounting holes and are threadedly connected to the threaded holes.

4. The valve plate sealing structure of a triple eccentric butterfly valve according to claim 1, characterized in that: The actuator (2) is any one of an electric actuator, a pneumatic actuator or a hydraulic actuator, and a clutch is provided between the handwheel (201) and the actuator (2) for switching between automatic control mode and manual control mode.

5. The valve plate sealing structure of a triple eccentric butterfly valve according to claim 1, characterized in that: The sealing surface of the valve plate (3) is an eccentric cone structure, and its generatrix and the center line of the rotating shaft (301) form a three-eccentric structure. The three-eccentric structure includes: radial eccentricity between the center line of the rotating shaft and the center of the valve plate sealing surface; axial eccentricity between the center line of the rotating shaft and the center line of the valve body flow channel; and angular eccentricity between the conical generatrix of the valve plate sealing surface and the center line of the rotating shaft.

6. The valve plate sealing structure of a triple eccentric butterfly valve according to claim 1, characterized in that: A sealing ring installation groove is formed between the pressure plate (303) and the valve plate (3); the cross-section of the second sealing ring (304) is trapezoidal, with its larger end facing the direction of the medium pressure.

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