Metal composite sealing structure and C-type ball valve

Abstract

The utility model relates to a kind of metal composite sealing structure and C type ball valve, metal composite sealing structure includes valve seat and C type ball, the front end of valve seat is provided with the valve seat sealing surface of the spherical surface shape adaptation of C type ball, the front end of valve seat is also provided with the compression assembly for being compressed with valve body, metal sealing ring is arranged between the front end of valve seat and compression assembly, and the opening of metal sealing ring is communicated with valve cavity, the utility model can solve the technical problem that when sealing is carried out using single metal sealing ring in prior art, there is poor sealing effect, frequent maintenance or replacement increases use cost.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a metal composite sealing structure and a C-type ball valve. Background Technology

[0002] In fluid transport systems, valves play a crucial role as key control components, including but not limited to functions such as shut-off, regulation, flow diversion, backflow prevention, pressure stabilization, flow splitting, and pressure relief. From the most basic shut-off valves to various types of valves used in complex automatic control systems, a wide variety of types and specifications are available to meet diverse engineering needs.

[0003] Specifically, among the many types of valves on the market, the C-type ball valve is a common and widely used valve body form. The design feature of this ball valve is that it uses a metal sealing ring between the valve seat and the C-shaped ball. However, it is worth noting that under conditions of frequent opening and closing or high-pressure impact, the preload of the single metal seal decreases, leading to seal failure. This necessitates frequent maintenance or replacement of the seal, significantly increasing operating costs. Utility Model Content

[0004] In view of the shortcomings of existing technologies, a metal composite sealing structure and a C-type ball valve are proposed to solve the technical problems of poor sealing effect and increased use costs due to frequent maintenance or replacement when using a single metal sealing ring.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] In a first aspect, this utility model provides a metal composite sealing structure, including a valve seat and a C-shaped ball. The front end of the valve seat is provided with a valve seat sealing surface adapted to the spherical shape of the C-shaped ball. The front end of the valve seat is also provided with a pressing component for pressing it against the valve body. A metal sealing ring is provided between the front end of the valve seat and the pressing component, and the opening of the metal sealing ring communicates with the valve cavity.

[0007] When the C-shaped ball is rotated to close the valve, the spherical surface of the C-shaped ball first contacts the metal sealing ring and compresses it to produce elastic deformation. This elastic deformation generates a reverse force on the spherical surface. After the medium enters the metal sealing ring, the metal sealing ring expands and further presses against the spherical surface of the C-shaped ball, forming the first seal. As the C-shaped ball continues to rotate, the spherical surface of the C-shaped ball then comes into close contact with the valve seat sealing surface, forming the second seal.

[0008] The technical solution is further configured such that the valve seat is provided with a first notch and the valve body is provided with a boss, and the first notch and the boss engage to form a limiting position.

[0009] The technical solution is further configured such that a second notch is provided at the front end of the valve seat, and the metal sealing ring is located inside the second notch.

[0010] The technical solution is further configured such that the clamping assembly includes a baffle and a fixing member. The fixing member is disposed inside the annular groove of the valve body. The first end of the baffle engages with the valve seat, and the first end and the second notch together form a space to accommodate the metal sealing ring. The second end of the baffle is fixed to the fixing member by a connector.

[0011] The technical solution is further configured such that a spring seat is provided between the rear end of the valve seat and the valve body, and the spring seat has a spring cavity for accommodating the spring, and the spring is in a compressed state.

[0012] The technical solution is further configured such that a spring cavity sealing ring for sealing the spring cavity is provided between the spring seat and the valve body.

[0013] The technical solution is further configured such that a sealing ring pressure plate is provided between the spring cavity sealing ring and the spring, the first end of the sealing ring pressure plate abuts against the spring cavity sealing ring, and the second end of the sealing ring pressure plate abuts against the spring.

[0014] The technical solution is further configured such that a valve seat sealing ring is provided at the junction of the valve seat and the spring seat.

[0015] Secondly, this utility model provides a C-type ball valve, which includes a valve body, and the metal composite sealing structure is provided inside the valve body.

[0016] The beneficial effects of this utility model are:

[0017] 1. By installing a metal sealing ring between the valve seat and the C-shaped ball, the metal sealing ring expands and presses further against the spherical surface of the C-shaped ball after the medium enters, further strengthening the sealing pressure and forming the first seal. As the C-shaped ball continues to rotate, the spherical surface then comes into close contact with the valve seat sealing surface, forming the second seal. Through the design of the metal sealing ring, the spherical surface, and the valve seat sealing surface, a reliable double seal is formed, greatly extending the service life of the valve. During long-term use, even if one seal leaks, the leakage amount is small and the pressure is low, which will not affect the other seal, and the valve can still maintain a good seal.

[0018] 2. By installing a spring between the valve seat and the valve body, the sealing surface of the valve seat is tightly fitted with the spherical surface of the C-shaped ball under the action of the spring, thereby improving the sealing effect. At the same time, the expansion of the metal caused by the increase in temperature can be adapted to the phenomenon by the elastic force of the spring, so as to prevent the valve seat and the C-shaped ball from getting stuck. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the C-type ball valve in an embodiment of this utility model;

[0020] Figure 2 yes Figure 1 Partial schematic diagram at point A in the middle;

[0021] Figure 3 This is a partial schematic diagram of the valve body in an embodiment of this utility model.

[0022] In the attached diagram: 1. Valve body; 2. C-shaped ball; 3. Valve seat; 4. Spring seat; 5. Valve cover; 6. Upper support shaft; 7. Valve stem; 8. Lower support shaft; 9. Metal sealing ring; 10. Fixing component; 11. Baffle; 12. Spring; 13. Spring cavity sealing ring; 14. Valve seat sealing ring; 15. Sealing ring pressure plate; 16. Annular groove; 17. First mounting groove; 18. Boss; 19. Second mounting groove. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments in this application, other similar embodiments obtained by those skilled in the art without creative effort should all fall within the scope of protection of this application. Furthermore, directional terms mentioned in the following embodiments, such as "up," "down," "left," and "right," are only for reference to the directions in the accompanying drawings; therefore, the directional terms used are for illustrative purposes and not for limiting the invention.

[0024] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0025] Example 1:

[0026] Please refer to a metal composite sealing structure. Figures 1 to 2 The valve includes a valve seat 3 and a C-shaped ball 2. The front end of the valve seat 3 is provided with a valve seat sealing surface that is adapted to the spherical shape of the C-shaped ball 2. The front end of the valve seat 3 is also provided with a clamping assembly for pressing it against the valve body 1. A metal sealing ring 9 is provided between the front end of the valve seat 3 and the clamping assembly, and the opening of the metal sealing ring is connected to the valve cavity.

[0027] Furthermore, the valve seat 3 has an annular structure, with its inner diameter matching the outer diameter of the C-shaped ball 2. The front end of the valve seat 3 faces the spherical surface of the C-shaped ball 2 and is designed as a valve seat sealing surface that matches the shape of the spherical surface, ensuring a tight fit with the spherical surface in the sealing state. The rear end of the valve seat 3 abuts against the inner wall of the valve body 1, forming a limit on the valve seat 3 and preventing the valve seat 3 from retracting when closed, which would cause a drop in sealing pressure and leakage.

[0028] Furthermore, the C-shaped sphere 2 is made of corrosion-resistant and wear-resistant alloy material, and its surface is precision machined and polished to ensure that the smoothness of the sphere meets the sealing requirements.

[0029] Furthermore, the metal sealing ring 9 is made of a high-temperature resistant material, preferably a high-temperature resistant stainless steel sealing ring, and the outer surface of the stainless steel sealing ring is plated with a silver layer. The cross-sectional shape of the metal sealing ring 9 can be W-shaped, U-shaped, C-shaped, etc. Please refer to [link / reference]. Figure 2 , is a C-shaped metal sealing ring 9, i.e., a C-shaped metal sealing ring.

[0030] When the C-shaped ball 2 is rotated to close the valve, its spherical surface first contacts the metal sealing ring 9 and compresses it, causing elastic deformation. This elastic deformation generates a reverse force on the spherical surface, forming an initial sealing force. After the medium enters the metal sealing ring 9, the metal sealing ring 9 expands and further presses against the spherical surface of the C-shaped ball 2, increasing the sealing pressure. At this point, a first seal is formed between the spherical surface and the metal sealing ring 9, cutting off the medium flow, resulting in zero velocity and no scouring. As the C-shaped ball 2 continues to rotate, its spherical surface then comes into close contact with the valve seat sealing surface, forming a second seal, completely cutting off the medium flow. By designing the metal sealing ring 9, the spherical surface, and the valve seat sealing surface, a reliable double seal is formed, greatly extending the valve's service life. During long-term use, even if one seal leaks, the leakage is small and the pressure is low, so it will not affect the other seal, and the valve can still maintain a good seal.

[0031] In one embodiment of the metal composite sealing structure, please refer to... Figures 1 to 3 The valve seat 3 is provided with a first notch, and the valve body 1 is provided with a boss 18. The first notch and the boss 18 engage to form a limit, preventing the valve seat 3 from retracting when closed, which would cause the sealing pressure to drop and leakage to occur.

[0032] Specifically, the first notch is distributed in a ring around the circumference of the valve seat 3, forming an engaging structure with the ring-shaped boss 18 on the valve body 1. The valve seat 3 and the valve body 1 are in rigid contact. When the valve is closed, the position of the valve seat 3 remains unchanged, and the spherical surface and the valve seat sealing surface always maintain a constant sealing pressure, ensuring reliable sealing.

[0033] In one embodiment of the metal composite sealing structure, please refer to... Figures 1 to 2 The valve seat 3 has a second notch at its front end, and the metal sealing ring 9 is located inside the second notch.

[0034] Specifically, the second notch is distributed in a ring around the circumference of the valve seat 3. At the same time, the second notch is located on the outer periphery of the valve seat sealing surface, and part of the metal sealing ring 9 is located outside the second notch, ensuring that the spherical surface of the C-shaped ball 2 contacts the metal sealing ring 9 first and compresses it.

[0035] In one embodiment of the metal composite sealing structure, please refer to... Figures 1 to 3 The clamping assembly includes a baffle 11 and a fixing member 10. The fixing member 10 is disposed inside the annular groove of the valve body 1. The first end of the baffle 11 engages with the valve seat 3, and the second end of the baffle 11 is fixed to the fixing member 10 by a connector. This design enables the clamping assembly to apply a stable preload to the valve seat 3 and the metal sealing ring 9.

[0036] Furthermore, the fixing member 10 is installed in the annular groove 16 on the inner wall of the valve body 1. The fixing member 10 is preferably a four-open ring, which is composed of four arc-shaped segments. These arc-shaped segments can be installed into the annular groove 16 respectively, and then squeezed together by elastic force to form a complete annular structure. The material of the fixing member 10 is usually selected as an elastic alloy material, which has a certain elastic deformation capacity and sufficient strength.

[0037] Furthermore, the first end of the baffle 11 engages with the flange of the valve seat 3, forming an axial limit on the valve seat 3. Simultaneously, the first end of the baffle 11 and the second notch together form a space to accommodate the metal sealing ring 9. The second end of the baffle 11 presses against the outside of the fixing member 10, and simultaneously, the second end abuts against the first mounting groove 17 to form a limit. Then, it is fixed to the fixing member 10 by the connecting member 12. The first mounting groove 17 is annular and is arranged circumferentially along the valve body 1. The radius of the first mounting groove 17 is smaller than the radius of the annular groove 16, and the junction of the two limits the fixing member 10. Preferably, the connecting member is a bolt, and the fixing member 10 has threaded holes adapted to the bolt.

[0038] In one embodiment of the metal composite sealing structure, please refer to... Figures 1 to 3 A spring seat 4 is provided between the rear end of the valve seat 3 and the valve body 1. The spring seat 4 has a spring cavity inside to accommodate the spring 12, which is in a compressed state. Under the action of the spring 12, the sealing surface of the valve seat is tightly fitted with the spherical surface of the C-shaped ball, improving the sealing effect. At the same time, the temperature rise will cause the metal to expand, and the elastic force of the spring 12 can adapt to this phenomenon to prevent the valve seat 3 and the C-shaped ball 2 from getting stuck.

[0039] Furthermore, a spring cavity sealing ring 13 is provided between the spring seat 4 and the valve body 1 to seal the spring cavity, and a valve seat sealing ring 14 is provided at the junction of the valve seat 3 and the spring seat 4. This structural design can prevent impurities from entering the spring cavity and avoid the phenomenon of impurities jamming the spring 12.

[0040] Specifically, the valve body 1 is provided with an annular second mounting groove 19. The spring cavity sealing ring 13 is located inside the second mounting groove 19. A sealing ring pressure plate 15 is provided between the spring cavity sealing ring 13 and the spring 12. The first end of the sealing ring pressure plate 15 is located inside the second mounting groove 19 and abuts against the spring cavity sealing ring 13. The second end of the sealing ring pressure plate 15 extends perpendicular to its first end and abuts against the spring 12. At the same time, the end of the second end of the sealing ring pressure plate 15 abuts against the inner wall of the valve body 1. While pressing the valve seat 3 against the spherical surface, the spring 12 continuously applies pressure to the spring cavity sealing ring 13 and the valve seat sealing ring 14 to maintain a reliable seal.

[0041] Example 2:

[0042] A type C ball valve, please refer to Figures 1 to 3 It includes a valve body 1, and the metal composite sealing structure is provided inside the valve body 1.

[0043] Furthermore, the valve body 1 is manufactured using a casting process, and the material is selected based on the actual working medium and environmental conditions, such as carbon steel, stainless steel, or cast iron. The internal space of the valve body 1 is designed to accommodate the installation of a metal composite sealing structure. Both ends of the valve body 1 are equipped with flanges or threaded connections for connection to the piping system.

[0044] In the C-type ball valve of this embodiment, please refer to Figures 1 to 3 The bottom of the valve body 1 is provided with a lower support shaft 8, the top of the valve body 1 is provided with a valve cover 5, and the inside of the valve cover 5 is provided with an upper support shaft 6. The C-shaped ball 2 is connected to the lower support shaft 8 and the upper support shaft 6 respectively.

[0045] Furthermore, the lower support shaft 8 is fixed to the bottom of the valve body 1 and is made of wear-resistant alloy material with a hardened surface to improve wear resistance and service life.

[0046] Furthermore, the valve cover 5 is bolted to the top of the valve body 1, and a sealing gasket is placed between the valve cover 5 and the valve body 1 to ensure the sealing of the connection. The valve cover 5 and the valve body 1 form a valve cavity. An upper support shaft 6 is provided inside the valve cover 5, and the upper support shaft 6 and the lower support shaft 8 are on the same straight line, jointly supporting the rotation of the C-shaped ball 2. The upper support shaft 6 is made of the same material as the lower support shaft 8 and has also undergone hardening treatment to improve wear resistance. The C-shaped ball 2 is connected to the lower support shaft 8 and the upper support shaft 6 by key connection or spline connection respectively.

[0047] Furthermore, a valve stem 7 is provided inside the upper support shaft 6. The end of the valve stem 7 is connected to the C-shaped ball 2. The valve stem 7, the upper support shaft 6, and the lower support shaft 8 are arranged collinearly, and this line serves as the rotation center line of the C-shaped ball 2.

[0048] Specifically, the valve stem 7 is made of high-strength alloy steel with an anti-corrosion surface treatment. The diameter of the valve stem 7 is determined according to the valve size and operating torque. The lower end of the valve stem 7 is connected to the C-type ball 2 by a key or spline connection to ensure reliable torque transmission. The upper end of the valve stem 7 extends to the outside of the valve cover 5, connecting to the operating mechanism such as a handwheel, electric actuator, or pneumatic actuator. A packing seal structure is provided at the position where the valve stem 7 passes through the valve cover 5 to prevent media leakage from the gap between the valve stem 7 and the valve cover 5. The packing seal structure includes components such as packing, packing gland, and clamping bolts. The packing material is selected according to the working medium and temperature conditions; commonly used materials include graphite and polytetrafluoroethylene (PTFE).

[0049] During valve opening, the valve stem 7 is rotated via the operating mechanism. The valve stem 7 drives the C-shaped ball 2 to rotate around its center line. The spherical surface gradually separates from the valve seat sealing surface and the metal sealing ring 9, forming a medium flow channel, allowing the medium to flow through the valve. During valve closing, the C-shaped ball 2 rotates in the opposite direction. The spherical surface first contacts the metal sealing ring 9 and compresses it, causing elastic deformation. This elastic deformation generates a reverse force on the spherical surface, forming an initial sealing force. After the medium enters the metal sealing ring 9, the metal sealing ring 9 expands and further presses against the spherical surface of the C-shaped ball 2, increasing the sealing pressure. At this point, a first seal is formed between the spherical surface and the metal sealing ring 9. As the C-shaped ball 2 continues to rotate, the spherical surface then comes into close contact with the valve seat sealing surface, forming a second seal, completely cutting off the medium. During this process, the spring 12 ensures a tighter fit between the valve seat sealing surface and the spherical surface of the C-shaped ball. Furthermore, the double-sealing structure ensures a reliable seal.

[0050] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0051] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0052] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0053] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0054] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A metal composite sealing structure, characterized in that, The valve includes a valve seat and a C-shaped ball. The front end of the valve seat is provided with a valve seat sealing surface that is adapted to the spherical shape of the C-shaped ball. The front end of the valve seat is also provided with a clamping assembly for pressing it against the valve body. A metal sealing ring is provided between the front end of the valve seat and the clamping assembly, and the opening of the metal sealing ring is in communication with the valve cavity. When the C-shaped ball is rotated to close the valve, the spherical surface of the C-shaped ball first contacts the metal sealing ring and compresses it to produce elastic deformation. This elastic deformation generates a reverse force on the spherical surface. After the medium enters the metal sealing ring, the metal sealing ring expands and further presses against the spherical surface of the C-shaped ball, forming the first seal. As the C-shaped ball continues to rotate, the spherical surface of the C-shaped ball then comes into close contact with the valve seat sealing surface, forming the second seal.

2. The metal composite sealing structure according to claim 1, characterized in that, The valve seat has a first notch, and the valve body has a boss. The first notch and the boss engage to form a limiting position.

3. The metal composite sealing structure according to claim 1, characterized in that, The valve seat has a second notch at its front end, and the metal sealing ring is located inside the second notch.

4. The metal composite sealing structure according to claim 3, characterized in that, The clamping assembly includes a baffle and a fixing member. The fixing member is disposed inside the annular groove of the valve body. The first end of the baffle engages with the valve seat, and the first end and the second notch together form a space to accommodate the metal sealing ring. The second end of the baffle is fixed to the fixing member by a connector.

5. The metal composite sealing structure according to claim 1, characterized in that, A spring seat is provided between the rear end of the valve seat and the valve body. The spring seat has a spring cavity inside to accommodate the spring, and the spring is in a compressed state.

6. The metal composite sealing structure according to claim 5, characterized in that, A spring cavity sealing ring is provided between the spring seat and the valve body to seal the spring cavity.

7. The metal composite sealing structure according to claim 6, characterized in that, A sealing ring pressure plate is provided between the spring cavity sealing ring and the spring. The first end of the sealing ring pressure plate abuts against the spring cavity sealing ring, and the second end of the sealing ring pressure plate abuts against the spring.

8. The metal composite sealing structure according to claim 5, characterized in that, A valve seat sealing ring is provided at the junction of the valve seat and the spring seat.

9. A type C ball valve, characterized in that, It includes a valve body, wherein the valve body is provided with a metal composite sealing structure as described in any one of claims 1-8.

Images