Sealing mechanism of floating type ball valve

Abstract

The utility model relates to the technical field of ball valves, in particular to a sealing mechanism of a floating ball valve, which is characterized in that two sides of the ball valve are fixedly connected with two ends of a connecting pipe respectively, the other end of the connecting pipe is fixedly connected with a connecting flange, the connecting flange is fixedly connected with a butt flange through a bolt and a nut, and the butt flange is sleeved with a butt pipe. A sealing ring is installed at the abutting position of the connecting pipe and the abutting pipe. And a limiting groove is formed in the edge of the flange. The sealing mechanism comprises a sliding rod moving in the radial direction, a U-shaped plate is fixed to one end of the sliding rod, limiting strips on the two sides of the inner wall of the U-shaped plate are slidably connected with limiting grooves, and the other end is connected with an adjusting assembly. The active limiting mechanism of the flange outer ring restrains gaps and deflection under the vibration working condition, the sealing press fit state is maintained, and the reliability is improved.

Description

Technical Field

[0001] This utility model relates to the field of ball valve technology, specifically to a sealing mechanism for a floating ball valve. Background Technology

[0002] Floating ball valves are a type of valve widely used in industrial and civil infrastructure pipeline systems. Their core opening and closing element is a ball with a through-circular channel. Driven by the valve stem, the ball rotates approximately 90 degrees within the valve body, allowing or stopping the flow of media. In scenarios where pipelines transport various media, flow rate regulation is often required according to system operating requirements. Due to their rapid opening and closing and low flow resistance, ball valves are frequently selected as key regulating mechanisms in pipelines, playing a vital role in ensuring optimal system operation and maintaining environmental safety.

[0003] In existing technologies, the valve body of a ball valve typically needs to be reliably connected to an external pipeline. To achieve this connection and ensure the sealing of the pipeline system after connection, existing technologies generally employ flange mating. Specifically, mating flanges are installed on the inlet and outlet faces of the ball valve and the corresponding pipe ends. Multiple sets of bolts are passed through the flange holes and tightened with nuts to press and fix the two flanges together, thereby establishing a sealed connection between the ball valve and the external pipeline.

[0004] However, in the actual operation of pipeline systems, dynamic operating parameters such as internal pressure fluctuations (e.g., fluid pulsation, water hammer) and temperature changes (e.g., thermal expansion and contraction) often induce system vibration. This continuous vibration energy is transmitted to the flange connection between the ball valve and the pipeline. Under vibration, the mating contact surfaces between the flanges may experience fretting, and this fretting friction can cause localized minor wear at the flange sealing interface. More importantly, the dynamic load caused by vibration acts directly on the flange body, potentially causing localized minor gaps or slight relative misalignment between the originally tightly fitted flange sealing surfaces. This change in the state of the flange mating surfaces disrupts the initial uniform and stable compression state. Even if the bolted connection structure itself has not yet experienced significant failure, the gaps or misalignments on the flange surface are sufficient to significantly weaken its sealing ability. Over a long period, this situation not only accelerates the wear of sealing elements but also directly leads to a decrease in the sealing performance at the connection between the ball valve and the external pipeline, significantly increasing the risk of media leakage. Utility Model Content

[0005] The purpose of this invention is to provide a sealing mechanism for a floating ball valve to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a sealing mechanism for a floating ball valve, comprising: a ball valve, both sides of which are fixedly connected to one end of a connecting pipe, and the other end of the connecting pipe is fixedly connected to a connecting flange. One side of the connecting flange is fixedly connected to a mating flange by bolts and nuts. A connecting pipe is fixedly sleeved on the mating flange. A sealing ring is installed between the connecting pipe and the connecting pipe. A sealing mechanism is provided on the outer ring surfaces of the connecting flange and the mating flange.

[0007] The connecting flange and the mating flange have a limit groove on one side wall near the edge. The sealing mechanism includes a slide rod that moves radially along the outer ring surface of the connecting pipe. One end of the slide rod is fixedly connected to the outer wall of the U-shaped plate. Limit strips are fixedly connected to both sides of the inner wall of the U-shaped plate. The limit strips are slidably connected to the limit groove. The other end of the slide rod is connected to an adjustment component for adjusting the slide rod to move radially along the outer ring surface of the connecting pipe.

[0008] Preferably, both the connecting pipe and the butt pipe have grooves on their abutting sides, the grooves are slidably connected to the sealing ring, the slide rod is slidably sleeved in the limiting plate, and the slide rod and the limiting plate are arranged in a circumferential array about the outer ring surface of the connecting pipe.

[0009] Preferably, the adjustment assembly includes a handwheel, which is fixedly connected to one end of a worm gear, and the worm gear is rotatably connected to one of the limiting plates via a support plate.

[0010] Preferably, a worm wheel is engaged on the upper side of the worm, the worm wheel is fixedly connected to one end of the connecting shaft, and the other end of the connecting shaft passes through the limiting plate and is fixedly connected to the pinion.

[0011] Preferably, the lower side of the pinion meshes with the large gear plate for transmission, and the surface of the large gear plate is provided with a drive groove. The drive groove is slidably connected to one end of the sliding pin, and the other end of the sliding pin is slidably sleeved in the limiting plate and fixedly connected to the sliding rod.

[0012] Preferably, the large gear disc is rotatably sleeved on the outer ring surface of the connecting pipe, and both sides of the large gear disc abut against the limiting ring, which is fixedly sleeved on the outer ring surface of the connecting pipe.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. By using a radially adjustable limiting mechanism (the fit between the U-shaped plate and the limiting groove) set around the outer ring of the flange, multi-directional mechanical constraints are applied to the mating flanges under vibration loads, directly suppressing the formation of local gaps and relative tilting tendencies on their contact surfaces caused by dynamic loads, thereby maintaining the initial uniform pressing state of the sealing interface and effectively blocking the path of sealing performance degradation caused by vibration.

[0015] 2. Building upon traditional bolt fastening and static sealing with sealing rings, an active limiting and protective layer is added to the flange body, forming a triple-layer synergistic sealing mechanism. This design ensures that the flange connection structure maintains a complete seal between the sealing surfaces even under complex conditions such as pressure pulsation and temperature fluctuations, reducing the risk of media leakage caused by fretting wear and interface displacement, and extending the service life of the sealing system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0018] Figure 3 This is a top view of the internal structure of this utility model;

[0019] Figure 4 This is a bottom view of the internal structure of this utility model.

[0020] In the diagram: 1. Ball valve; 2. Connecting pipe; 3. Connecting flange; 4. Butt flange; 5. Butt joint pipe; 6. Sealing ring; 7. Limiting groove; 8. Sliding rod; 9. U-shaped plate; 10. Limiting strip; 11. Groove; 12. Limiting plate; 13. Handwheel; 14. Worm gear; 15. Support plate; 16. Worm wheel; 17. Connecting shaft; 18. Pinion; 19. Large gear disc; 20. Drive groove; 21. Sliding pin; 22. Limiting ring. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] Example 1: Please refer to Figures 1-4This utility model provides a technical solution: a sealing mechanism for a floating ball valve, comprising: a ball valve 1, both sides of which are fixedly connected to one end of a connecting pipe 2, the connecting pipe 2 being symmetrically arranged about both sides of the ball valve 1, and a connecting flange 3 fixedly connected to the other end of the connecting pipe 2. One side of the connecting flange 3 is fixedly connected to a mating flange 4 by bolts and nuts, and a connecting pipe 5 is fixedly fitted on the mating flange 4. A sealing ring 6 is installed between the connecting pipe 2 and the connecting pipe 5. The fixed connection of the connecting flange 3 and the mating flange 4 forms a preliminary seal, and the sealing ring 6 installed between the connecting pipe 5 and the connecting pipe 2 further seals the valve. The outer surfaces of the connecting flange 3 and the mating flange 4 are provided with... A sealing mechanism is provided, which indirectly seals the ball valve 1 and the connecting pipe 5 through the sealing mechanism set on the outer ring of the connecting flange 3 and the docking flange 4, thereby ensuring the reliability of the seal. The connecting flange 3 and the docking flange 4 have a limit groove 7 on the side wall near the edge. The sealing mechanism includes a slide rod 8 that moves radially along the outer ring surface of the connecting pipe 2. The slide rod 8 can move closer to or away from the outer ring surface of the connecting pipe 2 in the radial direction. One end of the slide rod 8 is fixedly connected to the outer wall of the U-shaped plate 9. Limit strips 10 are fixedly connected to both sides of the inner wall of the U-shaped plate 9. The limit strips 10 are slidably connected to the limit groove 7. The other end of the slide rod 8 is connected to an adjustment component for adjusting the slide rod 8 to move radially along the outer ring surface of the connecting pipe 2.

[0023] In use, the connecting flanges 3 and 4 on the connecting pipes 2 and 5 of the ball valve 1 are coaxially connected and then initially tightened and sealed by several sets of bolts and nuts. Simultaneously, the connecting pipes 2 and 5 abut against each other, with a sealing ring 6 placed between them to further improve the sealing performance. Then, the sliding rod 8 is adjusted by the adjusting assembly to move radially towards the connecting pipe 2. This will cause the U-shaped plate 9 to move towards the outer ring surface of the connecting flange 3 and the docking flange 4. As the sliding rod 8 slides, the limiting strip 10 slides completely into the limiting groove 7. The U-shaped plates 9 are arranged in a circumferential array around the outer ring surface of the connecting pipe 2. At the same time, the U-shaped plates 9 in multiple directions slide and engage between the connecting flange 3 and the docking flange 4, limiting and fixing them. This avoids the formation of local small gaps or slight relative misalignment between the originally tightly fitted flange sealing surfaces, thereby ensuring that the sealing performance of the ball valve 1 and the docking pipe 5 does not decrease when the ball valve 1 is used for a long time, reducing the risk of media leakage.

[0024] Example 2: Based on Example 1, grooves 11 are provided on the abutting sides of both the connecting pipe 2 and the connecting pipe 5. The grooves 11 are slidably connected to the sealing ring 6. The sliding rod 8 is slidably sleeved in the limiting plate 12. The sliding rod 8 and the limiting plate 12 are arranged in a circumferential array about the outer ring surface of the connecting pipe 2. The sealing ring 6 is limited by the grooves 11, so that the sealing ring 6 is always tightly fixed between the connecting pipe 2 and the connecting pipe 5 when they are spliced, thereby improving the sealing reliability. The sliding rod 8 is limited by the limiting plate 12, thereby improving its movement stability.

[0025] Example 3: Based on Example 2, the adjustment assembly includes a handwheel 13, which is fixedly connected to one end of a worm gear 14. The worm gear 14 is rotatably connected to one of the limiting plates 12 via a support plate 15. The support plate 15 limits the movement of the worm gear 14. A worm wheel 16 meshes with the upper side of the worm gear 14, and the worm gear 14 and worm wheel 16 mesh and transmit power. The worm wheel 16 is fixedly connected to one end of a connecting shaft 17. The other end of the connecting shaft 17 passes through the limiting plate 12 and is fixedly connected to a pinion 18. The limiting plate 12 provides limiting support for the connecting shaft 17 that passes through it. The connecting shaft 17 is rotatably sleeved on the limiting plate 17. Inside the 2nd section, the lower side of the pinion 18 meshes with the large gear 19 for transmission. The surface of the large gear 19 has a drive groove 20, which is slidably connected to one end of the sliding pin 21. The other end of the sliding pin 21 is slidably sleeved in the limiting plate 12 and fixedly connected to the sliding rod 8. Both the limiting plate 12 and the drive groove 20 limit the sliding pin 21. The large gear 19 rotates and is sleeved on the outer ring surface of the connecting pipe 2. Both sides of the large gear 19 abut against the limiting ring 22. The limiting ring 22 is fixedly sleeved on the outer ring surface of the connecting pipe 2, and the limiting ring 22 limits the large gear 19, thereby ensuring the rotational stability of the large gear 19 on the outer ring surface of the connecting pipe 2.

[0026] After the initial sealing connection between the connecting pipe 2 and the connecting pipe 5 is stable, the handwheel 13 is turned to drive the worm gear 14 to rotate. The worm gear 14 rotates under the limitation of the support plate 15, thereby meshing with the worm wheel 16 for transmission. Under the connection of the connecting shaft 17, the connecting shaft 17 drives the pinion 18 to rotate. The pinion 18 meshes with the large gear 19, thereby driving the large gear 19 to move. The large gear 19 rotates stably under the limitation of the limiting ring 22, thereby driving the drive groove 20 opened on it to move. Since one end of the sliding pin 21 is sleeved in the drive groove 20, it will drive the sliding pin 21 to move. Since the other end of the sliding pin 21 is fixed to the sliding rod 8, The connection will then drive the slide rod 8 to move. The slide rod 8 is limited within the limiting plate 12 and will move radially along the connecting pipe 2 towards the connecting flange 3 and the mating flange 4. As the slide rod 8 slides, the U-shaped plate 9, which is fixedly connected to the slide rod 8, will slide under the limiting strip 10 and the limiting groove 7 until the limiting strip 10 is completely slid into the limiting groove 7. Finally, the U-shaped plate 9 will be locked between the edges of the connecting flange 3 and the mating flange 4. By setting several U-shaped plates 9, the connecting flange 3 and the mating flange 4 are further limited and fixed, so that the two are always in contact, ensuring the reliability of the connection and sealing of the connecting pipe 2 and the mating pipe 5 and the stable pressing state.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealing mechanism for a floating ball valve, comprising a ball valve (1), characterized in that: The ball valve (1) is fixedly connected to one end of the connecting pipe (2) on both sides. The other end of the connecting pipe (2) is fixedly connected to the connecting flange (3). One side of the connecting flange (3) is fixedly connected to the docking flange (4) by bolts and nuts. The docking flange (4) is fixedly fitted with the connecting pipe (5). The connecting pipe (2) and the connecting pipe (5) are fitted with a sealing ring (6). The outer ring surfaces of the connecting flange (3) and the docking flange (4) are provided with a sealing mechanism. The connecting flange (3) and the mating flange (4) have a limiting groove (7) on one side wall near the edge. The sealing mechanism includes a slide rod (8) that moves radially along the outer ring surface of the connecting pipe (2). One end of the slide rod (8) is fixedly connected to the outer wall of the U-shaped plate (9). Limiting strips (10) are fixedly connected to both sides of the inner wall of the U-shaped plate (9). The limiting strips (10) and the limiting groove (7) are slidably connected. The other end of the slide rod (8) is connected to an adjustment component for adjusting the slide rod (8) to move radially along the outer ring surface of the connecting pipe (2).

2. The sealing mechanism of a floating ball valve according to claim 1, characterized in that: The connecting pipe (2) and the connecting pipe (5) are both provided with grooves (11) on their abutting sides. The grooves (11) are slidably connected to the sealing ring (6). The slide rod (8) is slidably sleeved in the limiting plate (12). The slide rod (8) and the limiting plate (12) are arranged in a circumferential array about the outer ring surface of the connecting pipe (2).

3. The sealing mechanism of a floating ball valve according to claim 2, characterized in that: The adjustment assembly includes a handwheel (13), which is fixedly connected to one end of a worm gear (14). The worm gear (14) is rotatably connected to one of the limiting plates (12) via a support plate (15).

4. The sealing mechanism of a floating ball valve according to claim 3, characterized in that: The worm (14) is meshed with a worm wheel (16) on its upper side. The worm wheel (16) is fixedly connected to one end of the connecting shaft (17), and the other end of the connecting shaft (17) passes through the limiting plate (12) and is fixedly connected to the pinion (18).

5. The sealing mechanism of a floating ball valve according to claim 4, characterized in that: The small gear (18) meshes with the large gear plate (19) on its lower side. A drive groove (20) is provided on the surface of the large gear plate (19). The drive groove (20) is slidably connected to one end of the sliding pin (21). The other end of the sliding pin (21) is slidably sleeved in the limiting plate (12) and fixedly connected to the sliding rod (8).

6. The sealing mechanism of a floating ball valve according to claim 5, characterized in that: The large gear disc (19) is rotatably sleeved on the outer ring surface of the connecting pipe (2). Both sides of the large gear disc (19) abut against the limiting ring (22), and the limiting ring (22) is fixedly sleeved on the outer ring surface of the connecting pipe (2).

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