A bidirectional sealing eccentric ball valve

Abstract

The utility model provides a kind of bidirectional sealing eccentric ball valve, it is related to valve technology, specifically discloses valve body, valve seat and dome support, the valve body is opened in and has the valve-shaped chamber of hemispherical shape, the both ends of valve body are opened and have the inlet and outlet passage communicated with valve-shaped chamber;Dome support is rotationally arranged in valve-shaped chamber, one of the inlet and outlet passage is equipped with valve seat, the side opposite to dome support and valve seat is equipped with dome;Between dome support, thrust structure is equipped;The inlet and outlet passage for installing valve seat is equipped with valve seat compression ring, valve seat compression ring and valve seat abut, between valve seat compression ring and valve seat, pre-tightening structure is equipped, independent thrust structure and pre-tightening structure are arranged, respectively from dome side and valve seat side initiative provide compression force, ensure that valve can be effectively sealed under any flow direction and pressure state, solve the problem that traditional eccentric ball valve relies on medium pressure to realize sealing, cannot be reliably sealed under bidirectional flow or low pressure / zero pressure working condition.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and more specifically, to a bidirectional sealing eccentric ball valve. Background Technology

[0002] Traditional eccentric ball valves typically employ two structural forms for the valve seat and ball. One form uses a fixed valve seat and an integral ball, relying on the large output torque of the actuator to forcefully press the valve seat and ball together to achieve a seal. This structure requires high precision in the machining of valve parts and demands a larger output torque from the actuator compared to other types of ball valves. The other form uses a floating valve seat and an integral ball, relying on a valve seat spring and medium pressure to press the valve seat against the ball to achieve a seal. This structure does not require as high precision in the machining of valve parts or as high an output torque from the actuator as the first form, but it also cannot withstand reverse pressure and cannot achieve bidirectional sealing. Utility Model Content

[0003] The purpose of this utility model is to provide a bidirectional sealing eccentric ball valve, which addresses the shortcomings of the prior art and solves the problems mentioned in the background art.

[0004] The technical solution of this utility model is implemented as follows: This utility model provides a bidirectional sealing eccentric ball valve, including a valve body, a valve seat, and a ball crown support. The valve body has a hemispherical valve-shaped chamber, and both ends of the valve body have inlet and outlet channels communicating with the valve-shaped chamber. The ball crown support is rotatably disposed in the valve-shaped chamber, and a valve seat is provided in one of the inlet and outlet channels. A ball crown is installed on the side of the ball crown support opposite to the valve seat. A thrust structure is provided between the spherical crown and the spherical crown support, which is used to push the spherical crown closer to the valve seat side; The inlet and outlet channel for installing the valve seat is equipped with a valve seat pressure ring, which abuts against the valve seat. A pre-tightening structure is provided between the valve seat pressure ring and the valve seat to push the valve seat closer to the spherical crown side.

[0005] In some technical solutions of this utility model, the thrust-stopping structure includes a protrusion on the outside of the spherical crown support member, a groove is provided on the side of the spherical crown opposite to the spherical crown support member, a portion of the protrusion is embedded in the groove, and a connecting structure that can be detachably connected to the groove is provided on the protrusion.

[0006] In some technical solutions of this utility model, the connecting structure includes a mounting hole opened on the protrusion, a connecting sleeve embedded in the mounting hole, a connecting screw threadedly connected to the connecting sleeve, and an internal threaded hole threadedly connected to the connecting screw on the bottom of the groove.

[0007] In some technical solutions of this utility model, the thrust-stopping structure includes a second disc spring installed in the groove, and the second disc spring abuts against the outer wall of the protrusion.

[0008] In some technical solutions of this utility model, the pre-tightening structure includes an assembly groove, which is disposed between the valve seat and the ball crown, and a first disc spring that abuts against the ball crown is installed in the assembly groove.

[0009] In some technical solutions of this utility model, a number of fixing holes are provided around the outer side wall of the valve seat pressure ring, and fixing screws that are threadedly connected to the valve body are provided in each fixing hole.

[0010] In some technical solutions of this utility model, a valve seat sealing ring is installed between the valve seat and the side wall opposite to the inlet / outlet channel.

[0011] In some technical solutions of this utility model, an arc-shaped sealing surface is provided on the side wall opposite to the spherical crown of the valve seat, and the center of the circle containing the sealing surface is concentric with the center of the circle containing the outer arc surface of the spherical crown.

[0012] In some technical solutions of this utility model, a valve stem is rotatably provided on the valve body, the valve stem is detachably connected to the ball crown support, and a fixed shaft is detachably provided on the side of the valve body away from the valve stem, the fixed shaft is detachably connected to the ball crown support.

[0013] Compared with the prior art, this utility model has at least the following advantages or beneficial effects: This structure, by setting independent thrust structure and pre-tightening structure, actively provides clamping force from the ball crown side and valve seat side respectively, ensuring that the valve can achieve effective sealing under any flow direction and pressure state, solving the problem that traditional eccentric ball valves rely on medium pressure to achieve sealing and cannot reliably seal under bidirectional flow or low / zero pressure conditions; through two relatively independent but synergistic mechanisms of "ball crown support-thrust structure-ball crown" and "valve seat pressure ring-pre-tightening structure-valve seat", bidirectional and independent clamping and wear compensation of the sealing pair are achieved. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the structure when the valve seat end (left end) is pressurized in this utility model.

[0016] Figure 3 This is a schematic diagram of the structure of the ball crown end (right end) when pressure is applied in this utility model.

[0017] Reference numerals: 1. Valve body; 2. Valve seat pressure ring; 3. Fixing screw; 4. Valve seat sealing ring; 5. First disc spring; 6. Valve seat; 7. Ball crown support; 8. Ball crown; 9. Connecting screw; 10. Connecting sleeve; 11. Second disc spring; 12. Valve stem; 13. Fixing shaft. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0020] Example This utility model provides a bidirectional sealing eccentric ball valve, such as Figure 1 , Figure 2 As shown, it includes a valve body 1, a valve seat 6, and a spherical crown support 7. The valve body 1 has a hemispherical valve-shaped chamber inside, and inlet and outlet channels communicating with the valve-shaped chamber are opened at both ends of the valve body 1. A U-shaped spherical crown support 7 is rotatably mounted within the valve-shaped chamber. One inlet / outlet channel contains an annular valve seat 6, and a spherical crown 8 is mounted on the side of the spherical crown support 7 opposite to the valve seat 6. A thrust structure is provided between the spherical crown 8 and the spherical crown support 7 to push the spherical crown 8 towards the valve seat 6. A valve seat pressure ring 2 is provided in the inlet / outlet channel for mounting the valve seat 6, abutting against the valve seat 6. A pre-tightening structure is provided between the valve seat pressure ring 2 and the valve seat 6 to push the valve seat 6 towards the spherical crown 8. Through the bidirectional action of the thrust structure and the pre-tightening structure, the spherical crown 8 and the valve seat 6 are pushed closer together when closed, forming a bidirectional seal. The hemispherical valve-shaped chamber adapts to the rotation trajectory of the spherical crown 8, ensuring that the sealing surfaces are aligned when closed. Under bidirectional pressure, the sealing force is maintained by the mechanical structure and elastic elements, avoiding unidirectional dependence on fluid pressure.

[0021] When valve stem 12 is operated, the ball crown support 7 rotates within the valve cavity, causing the ball crown 8 to move relative to the valve seat 6. In the closed position, the thrust structure pushes the ball crown 8 closer to the valve seat 6, while the pre-tightening structure pushes the valve seat 6 closer to the ball crown 8 via the valve seat pressure ring 2, ensuring a tight fit between the ball crown 8 and the valve seat 6, achieving a seal. The thrust structure and the pre-tightening structure work together to ensure sealing reliability and adapt to pressure fluctuations. When open, the ball crown support 7 rotates, causing the ball crown 8 to move away from the valve seat 6, allowing fluid to flow through the inlet and outlet channels.

[0022] In some technical solutions of this utility model, the thrust-stop structure includes a protrusion on the outside of the spherical crown support 7, and a groove is formed on the side of the spherical crown 8 opposite to the spherical crown support 7. A portion of the protrusion is embedded in the groove, and a connecting structure is provided on the protrusion that is detachably connected to the groove. The protrusion and the groove form a stable mechanical connection, and the connecting structure ensures that the relative position between the spherical crown 8 and the spherical crown support 7 is adjustable and reliably fixed. When the spherical crown support 7 rotates, it drives the spherical crown 8 to move towards the valve seat 6 along the rotation direction of the spherical crown support 7. After the valve seat 6 and the spherical crown 8 reach the designated position, the spherical crown 8 presses against the valve seat 6 to achieve a seal.

[0023] In some technical solutions of this utility model, the connecting structure includes a mounting hole on the protrusion, a connecting sleeve 10 embedded in the mounting hole, a connecting screw 9 threadedly connected to the connecting sleeve 10, and an internal threaded hole threadedly connected to the connecting screw 9 on the bottom of the groove. The threaded connection between the connecting screw 9 and the internal threaded hole provides an adjustable tightening force, and works with the connecting sleeve 10 to protect the threads of the mounting hole and enhance the connection strength, ensuring no loosening between the protrusion and the groove. The screw insertion depth can finely adjust the installation position of the spherical crown 8. During assembly, the connecting sleeve 10 is placed first, and then the connecting screw 9 is screwed in to fasten the spherical crown 8 to the spherical crown support 7; disassembly is performed by reversing the operation.

[0024] Preferably, the spherical crown 8 and the connecting sleeve 10 have a certain distance of movement in the axial direction of the connecting sleeve 10.

[0025] In some technical solutions of this utility model, the thrust-stop structure includes a second disc spring 11 installed in the groove, which abuts against the outer wall of the protrusion. As an elastic element, the second disc spring 11 provides additional axial thrust in the thrust-stop structure, enhancing the clamping force between the ball crown 8 and the valve seat 6. The elastic deformation of the second disc spring 11 adapts to wear or temperature changes on the sealing surface, maintaining stable sealing pressure. When the ball crown 8 moves towards the valve seat 6, the second disc spring 11 is compressed, providing elastic thrust; after closing, the spring force continues to act, compensating for wear or gaps and improving the sealing effect between the valve seat 6 and the ball crown 8.

[0026] In some technical solutions of this utility model, the pre-tightening structure includes an assembly groove, which is disposed between the valve seat 6 and the ball crown 8. A first disc spring 5, which abuts against the ball crown 8, is installed in the assembly groove. The first disc spring 5 provides an initial pre-tightening force, ensuring that the valve seat 6 and the ball crown 8 can be in tight contact even under no pressure or low pressure, thereby improving the sealing effect. The assembly groove limits the position of the spring and prevents misalignment. When the valve seat pressure ring 2 is fixed, the first disc spring 5 is compressed, pushing the valve seat 6 closer to the ball crown 8; when closed, the spring force and fluid pressure work together to enhance the seal. The elastic pre-tightening compensates for manufacturing errors or deformations of the valve seat 6 and the ball crown 8, improving the consistency of the seal.

[0027] In some technical solutions of this utility model, a plurality of fixing holes are provided around the outer side wall of the valve seat pressure ring 2, and fixing screws 3 are threadedly connected to the valve body 1 in each fixing hole. The screw connection provides an adjustable clamping force to adapt to different working conditions, fixes the position of the valve seat pressure ring 2, and thus controls the compression of the pre-tightening structure. The distribution of multiple fixing holes ensures that the pressure ring is subjected to uniform force. When the fixing screws 3 are tightened, the valve seat pressure ring 2 is pressed against the valve seat 6, compressing the pre-tightening structure; when disassembling, the screws are loosened, and the valve seat 6 or the spring can be replaced.

[0028] In some technical solutions of this utility model, a valve seat sealing ring 4 is installed between the valve seat 6 and the side wall opposite to the inlet / outlet channel. The valve seat sealing ring 4 serves as a static sealing element, preventing fluid leakage from the gap between the valve seat 6 and the valve body 1. The sealing ring material (such as rubber or polytetrafluoroethylene) provides an elastic seal, adapting to minor deformations. When the valve seat 6 is pushed by the pre-tightening structure, the sealing ring is compressed and deformed, filling the gap; when the valve seat 6 moves, the sealing ring moves accordingly to form a dynamic seal.

[0029] In some technical solutions of this utility model, an arc-shaped sealing surface is formed on the side wall opposite to the spherical crown 8 of the valve seat 6. The center of the circle containing the sealing surface is concentric with the center of the circle containing the outer arc surface of the spherical crown 8. When the valve body 1 is closed, the outer arc surface of the spherical crown 8 is in uniform contact with the sealing surface, forming an annular sealing band; when opened, the two separate. The concentric design ensures that the curvature of the sealing surface matches that of the spherical crown 8, achieving surface contact sealing. At the same time, the pressure distribution of the sealing surface formed between the valve seat 6 and the spherical crown 8 is uniform, preventing leakage.

[0030] In some technical solutions of this utility model, a valve stem 12 is rotatably mounted on the valve body 1. The valve stem 12 is detachably connected to the spherical crown support 7. A fixed seat is detachably mounted on the side of the valve body 1 opposite to the valve stem 12, and a fixed shaft 13 is detachably mounted on the same side. The fixed shaft 13 is detachably connected to the spherical crown support 7. The valve stem 12 serves as the operating input, transmitting torque to the spherical crown support 7. The fixed shaft 13 provides an auxiliary support point for the spherical crown support frame, preventing the spherical crown support 7 from swaying or sagging and improving rotational accuracy. Both the valve stem 12 and the fixed shaft 13 are detachably connected to the spherical crown 8 connector for easy disassembly and maintenance. When the valve stem 12 rotates, it drives the spherical crown support 7 to rotate through the detachable connection. The fixed seat is installed on the other side of the valve body 1, and its fixed shaft 13 is detachably connected to the spherical crown support 7, providing support. When opening or closing, the valve stem 12 and the fixed shaft 13 work together to ensure the stable rotation of the spherical crown support 7.

[0031] When the medium enters the valve from the valve seat end (left end), under the action of the medium pressure, the valve seat 6 and the ball crown 8 move to the right until the ball crown 8 abuts against the B surface of the ball crown support 7. At this time, there is still a gap between the valve seat 6 and the A surface of the valve body 1. Therefore, the ball crown 8 is stopped by the abutment of the B surface of the ball crown support 7 and cannot move to the right any further. Under the action of the medium pressure, the valve seat 6 is subjected to a force to the right and presses against the ball crown 8. The higher the medium pressure, the greater the force of the valve seat 6 pressing against the ball crown 8. The higher the sealing pressure of the spherical sealing surface of the valve seat 6 and the ball crown 8, the higher the sealing pressure ratio. The medium is effectively blocked and sealed at the left end of the ball crown 8.

[0032] Similarly, such as Figure 3 As shown, when the medium enters the valve from the ball crown end (right end), under the action of the medium pressure, the ball crown 8 and the valve seat 6 move to the left until the valve seat 6 abuts against the C surface of the valve seat pressure ring 2. At this time, there is still a gap between the connecting sleeve 10 and the D surface of the ball crown support 7. Therefore, the valve seat 6 is limited by the abutment of the C surface of the valve seat pressure ring 2 and cannot move to the left any further. Under the action of the medium pressure, the ball crown 8 is subjected to a force to the left and presses against the valve seat 6. The higher the medium pressure, the greater the force of the ball crown 8 pressing against the valve seat 6. The higher the sealing pressure of the spherical sealing surface of the ball crown 8 and the valve seat 6, the higher the sealing pressure ratio. The medium is effectively blocked and sealed at the right end of the valve seat 6.

[0033] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A bidirectional sealing eccentric ball valve, comprising a valve body, a valve seat, and a ball crown support, wherein the valve body has a hemispherical valve-shaped chamber, and both ends of the valve body have inlet and outlet channels communicating with the valve-shaped chamber; characterized in that, The spherical crown support is rotatably disposed in the valve-shaped chamber, and a valve seat is provided in one of the inlet and outlet channels. A spherical crown is installed on the side of the spherical crown support opposite to the valve seat. A thrust-stop structure is provided between the spherical crown and the spherical crown support member, and the thrust-stop structure is used to push the spherical crown closer to the valve seat side; A valve seat pressure ring is provided in the inlet / outlet channel for installing the valve seat. The valve seat pressure ring abuts against the valve seat. A pre-tightening structure is provided between the valve seat pressure ring and the valve seat to push the valve seat closer to the spherical crown side.

2. The bidirectional sealing eccentric ball valve according to claim 1, characterized in that, The thrust-stop structure includes a protrusion on the outside of the spherical crown support. A groove is provided on the side of the spherical crown opposite to the spherical crown support. A portion of the protrusion is embedded in the groove. The protrusion is provided with a connecting structure that is detachably connected to the groove.

3. A bidirectional sealing eccentric ball valve according to claim 2, characterized in that, The connection structure includes a mounting hole on the protrusion, a connecting sleeve is embedded in the mounting hole, a connecting screw is provided in the connecting sleeve for threaded connection, and an internal thread hole for threaded connection with the connecting screw is provided on the bottom of the groove.

4. A bidirectional sealing eccentric ball valve according to claim 2 or 3, characterized in that, The thrust-stop structure includes a second disc spring installed in the groove, the second disc spring abutting against the outer wall of the protrusion.

5. A bidirectional sealing eccentric ball valve according to claim 1, characterized in that, The pre-tightening structure includes an assembly groove, which is disposed between the valve seat and the ball crown, and a first disc spring that abuts against the ball crown is installed in the assembly groove.

6. A bidirectional sealing eccentric ball valve according to claim 5, characterized in that, The outer wall of the valve seat pressure ring is provided with several fixing holes, and each fixing hole is provided with a fixing screw that is threaded to the valve body.

7. A bidirectional sealing eccentric ball valve according to claim 5, characterized in that, A valve seat sealing ring is installed between the valve seat and the side wall opposite to the inlet / outlet channel.

8. A bidirectional sealing eccentric ball valve according to claim 5, characterized in that, An arc-shaped sealing surface is provided on the side wall of the valve seat opposite to the spherical crown, and the center of the circle containing the sealing surface is concentric with the center of the circle containing the outer arc surface of the spherical crown.

9. A bidirectional sealing eccentric ball valve according to claim 1, characterized in that, A valve stem is rotatably mounted on the valve body. The valve stem is detachably connected to the spherical crown support. A fixed shaft is detachably mounted on the side of the valve body opposite to the valve stem. The fixed shaft is detachably connected to the spherical crown support.

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