Multi-layer runner necking-down type ball valve

Abstract

The utility model discloses a multi-layer flow channel necking-down type ball valve, relates to the technical field of ball valves, and solves the problems that high-pressure fluid scours a sealing surface and is cavitated due to the fact that a conventional flow channel outlet shape cannot effectively rectify and depressurize fluid. A sleeve is installed in the flow channel, the sleeve and the flow channel are coaxially arranged, the sleeve extends to the outlet position from the inlet position of the flow channel, and the sleeve is fixedly connected to the inner wall of the flow channel. The outlet position of the flow channel and the outlet of the sleeve are in a necking shape with the inner diameter gradually reduced. The sleeve divides the flow channel into multiple layers, layered flowing of fluid can be achieved, mutual interference among the fluid is reduced, the turbulent flow generation probability is reduced, and impact abrasion of the fluid to a sealing face is relieved. The necking shape accelerates the fluid through the Venturi effect, can rectify and depressurize the fluid, optimizes the flowing state of the fluid, balances the pressure of inner and outer flow channels of the sleeve and inhibits the cavitation phenomenon, the fluid impact is closer to the center of the flow channel, the turbulence intensity at an outlet is reduced, and the direct impact on the sealing surface of the valve seat is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, in particular to a multi-layer flow channel necking ball valve. Background Art

[0002] Nowadays, in modern industrial fields such as petrochemical industry, natural gas transportation, water supply and drainage, etc., as a core fluid control component, the performance of the ball valve directly affects the safety and stability of the system operation. At present, for the ball valves widely used on the market, the flow channels inside the valve balls mostly adopt a single structure design. Such traditional single-flow-channel ball valves expose many problems during actual use: on the one hand, in a high-pressure difference system, when the flow rate of the fluid changes due to passing through the flow channel of the ball, turbulent flow is extremely likely to occur, which will not only exacerbate the impact wear of the fluid on the valve and the pipeline behind the valve, shorten the service life of the valve, but also accelerate the wear of the sealing surface; on the other hand, the traditional single flow channel lacks the optimization and guidance of the fluid kinetic energy, and local eddy currents and pressure imbalance phenomena are common. Especially in a high-pressure difference system, it may cause bubbles to be generated in the fluid. When the bubbles burst in the high-pressure area, local high-pressure impacts will be generated, causing cavitation damage to the surface of the equipment. Thus, the conventional flow channel outlet shape cannot effectively rectify and reduce the pressure of the fluid, resulting in an unstable state of the fluid when flowing out of the valve, causing concentrated impact on the valve seat sealing surface, and the particulate matter in the medium is easily washed directly to the sealing area along with the high-speed fluid, increasing the risk of seal failure. Summary of the Utility Model

[0003] Objective of the utility model: In order to overcome the defects of the prior art, the utility model provides a multi-layer flow channel necking ball valve to solve the problems that the conventional flow channel outlet shape cannot effectively rectify and reduce the pressure of the fluid, resulting in high-pressure fluid flushing the sealing surface and cavitation phenomenon.

[0004] Technical solution of the utility model: It includes a ball body, and a flow channel for the fluid to pass through is opened in the ball body. A sleeve is installed in the flow channel. The sleeve is coaxially arranged with the flow channel and extends from the inlet position to the outlet position of the flow channel. The sleeve is fixedly connected to the inner wall of the flow channel; both the outlet position of the flow channel and the outlet of the sleeve are in a necking shape with a gradually decreasing inner diameter.

[0005] By adopting the above technical solution, the sleeve divides the flow channel into multiple layers, which can realize the stratified flow of the fluid, reduce the mutual interference between the fluids, reduce the probability of generating turbulent flow, and relieve the impact wear of the fluid on the sealing surface; while the necking shapes of the flow channel outlet and the sleeve outlet accelerate the fluid through the Venturi effect, can rectify and reduce the pressure of the fluid, optimize the fluid flow state, balance the pressure of the inner and outer flow channels of the sleeve, inhibit the cavitation phenomenon. At the same time, the fluid impact is closer to the center of the flow channel, reducing the turbulence intensity at the outlet and reducing the direct impact on the valve seat sealing surface.

[0006] In a possible design, at least two fixing plates are disposed outside the sleeve, the fixing plates are integrally connected to the sleeve and arranged along the radial direction of the sleeve, and the fixing plates are fixedly connected to the inner wall of the flow channel.

[0007] With the above design, the fixing plate plays the role of supporting and fixing the sleeve, ensuring that the sleeve is stably installed in the flow channel under the action of fluid pressure without displacement or shaking, thereby ensuring the stability of the multi-layer flow channel structure, thereby maintaining the effects of stratified flow guidance and rectification and pressure reduction, and avoiding the influence of fluid control performance due to sleeve instability.

[0008] In one possible design, a mounting groove is provided on the inner wall of the flow channel, the outer edge of the fixing plate is inserted into the mounting groove, one side of the fixing plate is abutted against the wall of the mounting groove, and a positioning block is provided on the other side. The positioning block is detachably installed in the inner wall of the flow channel by a screw and abuts against the fixing plate.

[0009] With the above design, only the installation groove needs to be processed in the flow channel, and there is no need to over-modify the entire ball valve, thereby reducing manufacturing costs. In addition, when the sleeve is worn or damaged, it can be quickly removed from the flow channel for inspection or replacement, thereby improving maintenance efficiency and reducing maintenance costs.

[0010] In a possible design, the fixing plate is fixed to the inner wall of the flow channel by welding.

[0011] With the above design, welding fixation can form a more solid connection structure, enhance the connection strength between the sleeve and the flow channel, improve the stability and reliability of the multi-layer flow channel structure under harsh working conditions such as high pressure and high flow rate, and effectively prevent the sleeve from loosening or falling off.

[0012] In a possible design, the constricted portions of the flow channel and the sleeve form curved surfaces that gradually bend inward.

[0013] Compared with the ordinary tapered necking, the curved surface shape can make the fluid flow smoother, further reduce the resistance of fluid flow, and reduce energy loss; at the same time, it can change the fluid flow rate and pressure more evenly, so that the state of the fluid when flowing out of the valve is more stable, better play the role of rectification and pressure reduction, enhance the protection of the valve seat sealing surface, and reduce the risk of sealing failure.

[0014] In a possible design, there are at least two sleeves, and two adjacent sleeves are in a concentric sleeve-connected shape and supported and fixed by a fixing plate.

[0015] With the above design, multiple sleeves can further refine the flow channel stratification, realize the stratified flow of more fluids with different characteristics, and adapt to more complex fluid working conditions and larger diameter pipeline systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1Schematic diagram of the sphere structure of a specific embodiment of the present utility model;

[0017] Figure 2 Cross-sectional view of a specific embodiment of the present utility model;

[0018] Figure 3 Exploded view of a specific embodiment of the present utility model;

[0019] Figure 4 Cross-sectional view of another embodiment of the present utility model;

[0020] Wherein, 1, sphere; 11, flow channel; 12, mounting groove; 13, positioning block; 14, positioning groove; 2, sleeve; 21, reduced diameter section; 3, fixing plate. Specific implementation manner

[0021] As Figures 1-3 shown, a multi-layer flow channel reduced-diameter ball valve includes a sphere 1 for opening and closing. A flow channel 11 for fluid passage is provided in the sphere 1. A sleeve 2 is installed in the flow channel 11. The sleeve 2 is coaxially arranged with the flow channel 11 and extends from the inlet position to the outlet position of the flow channel 11. The sleeve 2 is fixedly connected to the inner wall of the flow channel 11. In this way, the original single-layer flow channel 11 is divided into an inner-layer flow channel 11 inside the sleeve 2 and an outer-layer circulating flow channel between the sleeve 2 and the inner wall of the flow channel 11, and even several middle-layer flow channels 11 formed by multiple sleeves 2, realizing the stratified flow of the fluid, significantly improving the uniformity of the flow velocity distribution, and reducing the superposition of turbulent flows. The outlet position of the flow channel 11 and the outlet of the sleeve 2 are both processed into a reduced-diameter shape with a gradually decreasing inner diameter. The length of the reduced-diameter section 21 accounts for 15%-30% of the total length of the flow channel 11, and the inner diameter of the end of the reduced-diameter section 21 is 80%-95% of the inlet section. The reduced-diameter section 21 structure accelerates the fluid and balances the pressure, reducing the risk of turbulent flow and cavitation, and is very suitable for use in high-pressure pipeline systems.

[0022] Four fixing plates 3 are arranged outside the sleeve 2. The adjacent fixing plates 3 are spaced 90 degrees apart. The fixing plates 3 are integrally connected with the sleeve 2 and are arranged along the radial direction of the sleeve 2. The fixing plates 3 are fixedly connected to the inner wall of the flow channel 11. Among them, the sleeve 2 and the fixing plates 3 are made of 316L stainless steel. The surfaces of the sleeve 2 and the fixing plates 3 facing the medium form a sharp angle shape for cutting the fluid and reducing the interference with the fluid. The fixing plates 3 ensure that the sleeve 2 does not displace or deform under the impact of high-pressure and high-speed fluid, maintaining the geometric accuracy of the multi-layer flow channel 11 structure, and avoiding the failure of the flow channel 11 stratification caused by the offset of the sleeve 2.

[0023] The inner wall of the flow channel 11 is provided with a strip-shaped installation groove 12. The outer edge of the fixing plate 3 is inserted into the installation groove 12. One side of the fixing plate 3 is in contact with the groove wall of the installation groove 12, and a positioning block 13 is arranged on the other side. The positioning block 13 is detachably installed in the inner wall of the flow channel 11 through a screw member and is in abutting cooperation with the fixing plate 3. The positioning block 13 can be machined from the sphere 1, so that the sphere 1 has a positioning groove 14 adapted to the positioning block 13, so as to better fit the shape of the inner wall of the flow channel 11 and reduce the interference with the fluid. In this way, the quick disassembly and assembly of the sleeve 2 are allowed, which is convenient for cleaning the sediment in the flow channel 11 or replacing the damaged sleeve 2, reducing the maintenance cost. In addition, from the perspective of processing and manufacturing, this is equivalent to forming a split structure between the sleeve 2 and the sphere 1. Only the installation groove 12 and the positioning groove 14 need to be machined in the existing stock sphere 1, and the sleeve 2 can be installed in the sphere 1, reducing the processing difficulty and cost. In actual use, the installer can choose whether to install the sleeve 2 according to actual situations such as fluid, installation conditions, and installation requirements. Even if the sleeve 2 is not selected to be installed, the influence of the opened installation groove 12 and other slots on the fluid is small.

[0024] Different from the above, the fixing plate 3 and the inner wall of the flow channel 11 are fixed by welding. Welding fixation completely eliminates the connection gap between the sleeve 2 and the inner wall of the flow channel 11, avoiding the risks of corrosion or loosening caused by fluid penetration, and is especially suitable for extreme working conditions such as ultra-high pressure and high temperature.

[0025] At the necking shape position of both the flow channel 11 and the sleeve 2, a curved surface shape that gradually bends inward is formed, similar to a continuous and smooth parabolic curved surface. The curved surface transition can reduce the kinetic energy loss when the fluid turns, guide the fluid to accelerate smoothly, further reduce local eddy currents and pressure drops, and improve energy efficiency.

[0026] Another embodiment: Different from the above specific embodiment, as Figure 4 shown, there are at least two sleeves 2, and two adjacent sleeves 2 are concentrically sleeved. For example, two concentric sleeves 2 can form inner, middle, and outer three-layer flow channels 11, which are suitable for complex fluid working conditions or large-diameter pipeline systems. The adjacent sleeves 2 need to be supported by the fixing plate 3 and fixed by welding to form a space truss effect, improving the anti-deformation ability of the overall flow channel 11 structure and avoiding the risk of collapse of the flow channel 11 under high pressure difference.

Claims

1. A multi-layer channel necking ball valve, comprising a sphere (1), wherein a channel (11) for fluid to pass through is formed in the sphere (1), and is characterized in that: A sleeve (2) is installed in the flow channel (11). The sleeve (2) is coaxially arranged with the flow channel (11) and extends from the inlet position to the outlet position of the flow channel (11). The sleeve (2) is fixedly connected to the inner wall of the flow channel (11). The outlet positions of both the flow channel (11) and the sleeve (2) are in a shape of a reduced opening with a gradually decreasing inner diameter.

2. The multi-layer flow channel necking type ball valve according to claim 1, characterized in that: At least two fixing plates (3) are arranged outside the sleeve (2). The fixing plates (3) are integrally connected with the sleeve (2) and arranged along the radial direction of the sleeve (2). The fixing plates (3) are fixedly connected to the inner wall of the flow channel (11).

3. The multi-layer flow channel necking type ball valve according to claim 2, wherein: An installation groove (12) is formed in the inner wall of the flow channel (11). The outer edge of the fixing plate (3) is inserted into the installation groove (12). One side of the fixing plate (3) abuts against the groove wall of the installation groove (12), and a positioning block (13) is arranged on the other side. The positioning block (13) is detachably installed in the inner wall of the flow channel (11) through a screw member and abuts against the fixing plate (3) for cooperation.

4. The multi-layer flow channel necking type ball valve according to claim 2, wherein: The fixing plate (3) is fixedly welded to the inner wall of the flow channel (11).

5. The multi-layer flow channel necking type ball valve according to claim 1 or 2, characterized in that: At the positions of the reduced opening shapes of both the flow channel (11) and the sleeve (2), a curved surface shape that gradually bends inward is formed.

6. The multi-layer flow channel necking type ball valve according to claim 2, wherein: There are at least two sleeves (2). Two adjacent sleeves (2) are concentrically sleeved and supported and fixed by the fixing plates (3).

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