Large-diameter dustproof ball valve

Abstract

The utility model provides a large-diameter dustproof ball valve, and relates to the technical field of ball valves. The dustproof ball valve comprises a valve body, a ball body, a first supporting piece, a second supporting piece and a valve rod, the first supporting piece is rotationally arranged at the upper end of the ball body, the second supporting piece is arranged at the lower end of the ball body, and the ball body is installed in the valve body through the first supporting piece and the second supporting piece; the valve rod penetrates through the valve body and the second supporting piece and then is connected with the ball body, connecting bodies are arranged on the two sides of the valve body, and valve seat assemblies are arranged between the connecting bodies and the ball body. By means of the structure, the spring cavity and the sliding bearing in the valve seat effectively isolate solid-containing media, so that the use reliability and the service life of the large-diameter dustproof ball valve are guaranteed, the woven packing is used as the dustproof ring, and compared with other formed dustproof rings, the large-diameter dustproof ball valve is low in cost and not prone to damage.

Description

Technical Field

[0001] This utility model relates to the field of ball valve technology, and more specifically, to a large-diameter dustproof ball valve. Background Technology

[0002] Valves are crucial control components in fluid transport systems, widely used in industries such as petroleum, chemical, metallurgy, and energy. Ball valves, with their excellent sealing performance, wear resistance, and long service life, have become the preferred choice for harsh operating conditions. With technological advancements and the prevailing trends of environmental protection and sustainable development, chemical and energy plants are becoming increasingly large-scale to improve production efficiency and reduce costs, leading to a growing demand for larger valve diameters for fluid control. Taking coal chemical and polysilicon plants as examples, their media often contain solid particles, resulting in harsh valve operating conditions. Ball valves require specialized designs to handle these conditions. Traditional large-diameter ball valves for oil and gas transportation are only suitable for clean gaseous or liquid media and are not suitable for media containing solids or dust.

[0003] In some coal chemical and polysilicon plants, the media often contain high-hardness particles and dust, making the valve operating conditions extremely harsh. Given the structural characteristics of ball valves, the sealing between the valve seat and the valve body, and between the valve seat and the ball, generally requires spring pre-tightening to achieve the sealing pressure. However, particles or dust in the media can enter and continuously accumulate in the spring cavity, causing the spring to be unable to extend and retract freely. The spring cannot provide sufficient elasticity to maintain the valve's sealing performance, resulting in valve sealing failure and internal leakage, which seriously affects the performance and service life of the ball valve. Therefore, sealing treatment is usually required between the two ends of the valve seat and the valve body. Utility Model Content

[0004] The purpose of this utility model is to provide a large-diameter dustproof ball valve that addresses the shortcomings of existing technologies. It can effectively prevent fine particulate media from entering the valve seat spring cavity and causing spring failure, and prevent particulate media from entering the sliding bearing and causing bearing damage, thereby avoiding problems such as valve seizure and sealing failure.

[0005] The technical solution of this utility model is implemented as follows:

[0006] This utility model provides a large-diameter dustproof ball valve, including a valve body, a ball, a first support member, a second support member, and a valve stem. The first support member is rotatably disposed at the upper end of the ball, and the second support member is disposed at the lower end of the ball. The ball is installed in the valve body through the first support member and the second support member. The valve stem passes through the valve body and the second support member and is connected to the ball. Connecting bodies are provided on both sides of the valve body, and a valve seat assembly is provided between the connecting body and the ball.

[0007] In some technical solutions of this utility model, the valve seat assembly includes a valve seat disposed between the connecting body and the ball. The valve seat has an inclined surface adapted to the ball. An installation chamber is provided between the valve seat and the connecting body. A first dustproof ring, a spring seat, a pressure ring, and valve seat packing are sequentially installed in the installation chamber. A spring hole is provided in the pressure ring. A helical spring that abuts against the spring seat is provided in the spring hole. A second dustproof ring that abuts against the connecting body is provided on the side of the valve seat near the ball.

[0008] In some technical solutions of this utility model, a first sliding bearing is provided between the second support member and the ball, and a third dustproof ring is provided between the second support member and the ball.

[0009] In some technical solutions of this utility model, a fourth dustproof ring is provided between the second support member and the valve stem.

[0010] In some technical solutions of this utility model, a second sliding bearing and a fifth dustproof ring are sequentially provided between the valve body and the valve stem.

[0011] In some technical solutions of this utility model, an installation area is provided between the ball and the first support member, a third sliding bearing is installed in the installation area, and a sixth dustproof ring is provided between the ball and the first support member.

[0012] In some technical solutions of this utility model, the inner diameter of the first dustproof ring is larger than the inner diameter of the valve seat sealing surface.

[0013] Compared with the prior art, the present invention has at least the following advantages or beneficial effects:

[0014] Dustproof ball valves are easy to implement, widely applicable, and suitable for use in various harsh conditions involving solids. By incorporating a dustproof ring at the interface with the fluid medium, and by fully considering the ease and economy of machining and assembling large-diameter ball valve components, effective isolation of the valve seat spring cavity and sliding bearing area from solid media is ensured, thereby guaranteeing the reliability and lifespan of large-diameter dustproof ball valves. Using braided packing as the dustproof ring is less costly and less prone to damage compared to other molded dustproof rings. The appropriately sized mounting grooves facilitate assembly with the dustproof ring, improving dustproof performance and ensuring reliable operation of the ball valve. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic cross-sectional view of the overall structure of this utility model;

[0017] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle;

[0018] Figure 3 for Figure 1 A magnified view of a portion of point B in the middle;

[0019] Figure 4 for Figure 1 A magnified view of a portion of point C.

[0020] Icons: 1. Connector; 2. Valve body; 3. Ball; 4. First support member; 5. Valve seat assembly; 6. Second support member; 7. Valve stem; 21. First dustproof ring; 22. Spring seat; 23. Helical spring; 24. Pressure ring; 25. Valve seat packing; 26. Valve seat; 27. Second dustproof ring; 201. Flow channel; 203. Spring hole; 31. First sliding bearing; 32. Third dustproof ring; 33. Third dustproof ring; 35. Second sliding bearing; 41. Sixth dustproof ring; 42. Third sliding bearing. Detailed Implementation

[0021] 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.

[0022] Therefore, the following detailed description of the embodiments of the present 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 the present invention without inventive effort are within the scope of protection of the present invention.

[0023] Example

[0024] Please refer to Figures 1-4 As shown.

[0025] This utility model provides a large-diameter dustproof ball valve, such as Figure 1 , Figure 2 As shown, the connecting body 1 and valve body 2 are fastened together by bolts to connect to an external pipeline, enabling the valve body to communicate with the pipeline and facilitating later disassembly. A first support member 4 and a second support member 6 are provided between the two connecting bodies 1. The inner end face of the connecting body 1 abuts against the first support member 4 and the second support member 6, and the first support member 4 and the second support member 6 are completely fixed to the connecting body 1 by a cylindrical pin. The first support member 4 and the second support member 6 are both provided with mounting holes, which are in convex-concave fit with the outer protrusion on the ball 3. The ball 3 is fixed to the first support member 4 and the second support member 6 by a first sliding bearing 31 and can rotate around the axial direction of the shaft 7. The valve seat assembly 5 is placed inside the connecting body 1. The ball 3 and the valve stem 7 are connected by a flat tenon, constraining one degree of freedom, so that the valve stem 7 can drive the ball 3 to move by rotation. A second sliding bearing 35, a stuffing box and sealing packing are provided between the valve stem 7 and the valve body 2 to fix and seal the valve stem 7.

[0026] The valve seat assembly 5 includes a first dustproof ring 21, a spring seat 22, a helical spring 23, a pressure ring 24, a valve seat packing 25, a valve seat 26, and a second dustproof ring 27. The first dustproof ring 21 is wound around the inner hole of the connecting body 1 and is also placed within the mounting cavity formed by the connecting body 1 and the valve seat 2. It is compacted by the boss on the spring seat 22, ensuring that the dustproof ring 21 completely fills the gap between the connecting body 1 and the valve seat 26, preventing solid particles in the flow channel 201 from entering the spring hole 203 where the helical spring 23 is located. The helical spring 23 is placed within the spring hole 203 of the spring seat 22. After assembly, it is in a compressed state. The end of the spring seat 22 away from the spring hole abuts against the connecting body 1 through its end face. The right end of the valve seat packing 25 abuts against the corresponding inclined surface of the valve seat 26. The compressive force of the helical spring 23 compacts the valve seat packing 25 through the pressure ring 24. After compaction, the valve seat packing 25 fully fills the gap between the connecting body 1 and the valve seat 26, forming a reliable seal.

[0027] Finally, the compression force of the helical spring 23 also acts on the valve seat 26, making the sealing surface on the valve seat 26 fit tightly with the sealing surface of the ball 3, achieving a sealing pressure and forming an initial seal between the valve seat 26 and the ball 3.

[0028] The second dustproof ring 27 is wrapped around the outer annular groove of the valve seat 26 to prevent solid particulate media from entering the gap between the valve seat packing 25 and the dustproof ring 27, thus preventing the gap from being blocked and causing the valve seat 26 to become stuck and unable to move left or right.

[0029] Furthermore, this technology solves the problem in existing technologies where the valve flow path is placed vertically and the valve seat components are installed sequentially in a horizontal direction, causing the spring to fall off. This technology installs the dust ring 21, spring seat 22, helical spring 23, pressure ring 24, valve seat packing 25, and valve seat 26 sequentially into the connecting body 1. This assembly sequence eliminates the need to assemble the components into a single assembly before inserting them into the valve seat hole, and requires no special tooling. Therefore, it is highly suitable for assembling large-sized components in large-diameter ball valves.

[0030] like Figure 3 As shown, the end of the spring seat 22 away from the spring hole abuts against the connecting body 1 through its end face, which can precisely control the compression of the first dust ring 21. This prevents the first dust ring 21 from being over-compressed, causing an airtight seal between the valve seat 26 and the valve body 1 at the first dust ring 21, thus affecting the force exerted by the medium pressure on the valve seat. Furthermore, to avoid the potential airtightness effect of the first dust ring 21, the inner diameter Φd1 of the first dust ring 21 is larger than the inner diameter Φd2 of the sealing surface of the valve seat 26. Therefore, even if the first dust ring 21 is completely airtight, the resultant force of the medium pressure in the ball valve flow channel acting on the valve seat 26 is still directed towards the ball end, causing the valve seat 26 to press against the ball 3, ensuring a seal between them.

[0031] A first sliding bearing 31 with clearance fit is provided between the second support member 6 and the ball 3. When the ball 3 rotates, the friction between the second support member 6 and the first sliding bearing 31, and between the ball 3 and the first sliding bearing 31, is sliding friction. When hard particles of medium intrude into the gap between the first sliding bearing 31 and the second support member 6 and the ball 3, the rotating ball 3 will inevitably scratch the mating surfaces, resulting in increased sliding friction until the second support member 6, the ball 3, and the first sliding bearing 31 are damaged, ultimately affecting the normal opening and closing operation and service life of the valve. A dustproof ring 32 is wound in the outer groove of the ball 3, filling the gap between the second support member 6 and the ball 3. A dustproof ring 33 is wound in the outer groove of the valve stem 7, filling the gap between the second support member 6 and the valve stem 7. By setting a third dustproof ring 32 and a fourth dustproof ring 33 at both ends of the area where the first sliding bearing 31 is installed, solid particles in the medium can be effectively prevented from intruding into the area where the first sliding bearing 31 is located, thereby avoiding the above-mentioned failure.

[0032] Similarly, the fifth dustproof ring 34 is placed in the outer groove of the valve stem 7 to fill the gap between the valve body 2 and the valve stem 7, preventing solid particles in the medium from entering the installation area of ​​the second sliding bearing 35, and avoiding damage to the sliding bearing 35 and the valve stem 7 by solid particles in the medium during operation.

[0033] Similarly, the sixth dustproof ring 41 is placed in the outer groove of the first support member 4, filling the gap between the ball 3 and the first support member 4, preventing solid particles in the medium in area 401 from entering the installation area where the third sliding bearing 42 is located, and avoiding damage to the third sliding bearing 42, the ball 3 and the first support member 4 by solid particles in the medium during operation.

[0034] 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 large-diameter dustproof ball valve, characterized in that, The valve includes a valve body (2), a ball (3), a first support member (4), a second support member (6), and a valve stem (7). The first support member (4) is rotatably disposed on the upper end of the ball (3), and the second support member (6) is disposed on the lower end of the ball (3). The ball (3) is installed in the valve body (2) through the first support member (4) and the second support member (6). The valve stem (7) passes through the valve body (2) and the second support member (6) and is connected to the ball (3). Connecting bodies (1) are provided on both sides of the valve body (2), and a valve seat assembly (5) is provided between the connecting body (1) and the ball (3).

2. The large-diameter dustproof ball valve according to claim 1, characterized in that, The valve seat assembly (5) includes a valve seat (26) disposed between the connector (1) and the ball (3). The valve seat (26) has an inclined surface adapted to the ball (3). An installation chamber is provided between the valve seat (26) and the connector (1). A first dustproof ring (21), a spring seat (22), a pressure ring (24), and a valve seat packing (25) are installed in sequence in the installation chamber. A spring hole (203) is provided in the pressure ring (24). A helical spring (23) abuts against the spring seat (22) is provided in the spring hole (203). A second dustproof ring (27) abuts against the connector (1) is provided on the side of the valve seat (26) near the ball (3).

3. A large-diameter dustproof ball valve according to claim 1, characterized in that, A first sliding bearing (31) is provided between the second support member (6) and the ball (3), and a third dustproof ring (32) is provided between the second support member (6) and the ball (3).

4. A large-diameter dustproof ball valve according to claim 1, characterized in that, A fourth dustproof ring (33) is provided between the second support member (6) and the valve stem (7).

5. A large-diameter dustproof ball valve according to claim 2 or 3, characterized in that, A second sliding bearing (35) and a fifth dustproof ring (34) are sequentially provided between the valve body (2) and the valve stem (7).

6. A large-diameter dustproof ball valve according to claim 1, characterized in that, An installation area is provided between the ball (3) and the first support member (4), a third sliding bearing (42) is installed in the installation area, and a sixth dustproof ring (41) is provided between the ball (3) and the first support member (4).

7. A large-diameter dustproof ball valve according to claim 2, characterized in that, The inner diameter of the first dustproof ring (21) is larger than the inner diameter of the sealing surface of the valve seat (26).

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