A full-welded ball valve

Abstract

The present application relates to the technical field of ball valve, more particularly, to a full-welded ball valve, which comprises a welded valve body, a movable valve core, a ball and a floating valve seat; the left and right sides of the inner cavity of the welded valve body are both provided with stepped holes, the two ends of the movable valve core are respectively provided with columnar structures which are in sliding fit with the stepped holes on the corresponding side, the two ends of the movable valve core are respectively in sealing fit with the stepped holes on the corresponding side through corrugated pipes I, and a rebound device is arranged between the movable valve core and the welded valve body to drive the movable valve core to move to the medium inlet side of the welded valve body; the medium inlet side of the welded valve body is provided with a cut-off device. The pressure balance mechanism composed of the movable valve core, the rebound device and the cut-off device is arranged, in the closed state of the ball, the medium pressure is mainly borne by the cut-off device, and the ball only bears the elastic force provided by the rebound device, so that the sealing reliability and service life of the valve under the high-pressure frequent opening and closing working condition are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of ball valve technology, and more specifically, to a fully welded ball valve. Background Technology

[0002] All-welded ball valves, as key control components in pipeline systems, are widely used in high-pressure transportation fields such as oil and natural gas. Traditional all-welded ball valves typically consist of a valve body, valve core, ball, and floating seat. The ball is rotatably connected to the valve body via a support shaft, and the floating seat, under spring pressure, presses against the ball to seal, thus controlling the flow of the medium. However, under high-pressure conditions, the medium pressure acts directly on the ball surface, significantly increasing the frictional resistance between the support shaft and the valve body. Frequent opening and closing operations can easily cause wear on the support shaft and displacement of the ball, thus affecting sealing performance and valve lifespan. Furthermore, traditional ball valves often use O-ring seals between the floating seat and valve core, which require high installation precision and are prone to seal failure due to prolonged contact with the medium or impurities.

[0003] Therefore, it is necessary to improve existing technologies. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, a fully welded ball valve structure is provided that can operate stably under high pressure, reduce the stress on the ball, and improve sealing durability.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A fully welded ball valve includes a welded valve body, a movable valve core, a ball, and a floating valve seat. The ball and the floating valve seat are both disposed on the movable valve core. The movable valve core has a through hole in the middle. The ball is connected to a rotary drive mechanism. The ball and the floating valve seat cooperate to control the opening and closing of the through hole.

[0007] The welded valve body has stepped holes on both the left and right sides of the inner cavity. The movable valve core has columnar structures at both ends that slide with the stepped holes on the corresponding sides. The movable valve core is sealed with the stepped holes on the corresponding sides through bellows I. A spring-loaded device is provided between the movable valve core and the welded valve body to drive the movable valve core to move toward the medium inlet side of the welded valve body.

[0008] A flow-stopping device is provided on the medium inlet side of the welded valve body. The flow-stopping device includes a drive rod and a first valve plate and a second valve plate rotatably connected to it. The drive rod is fixedly connected to the movable valve core. Both the first and second valve plates include an inner ring, an outer ring, and two sector plates disposed between the inner and outer rings. The two sector plates are centrally symmetrical. The first valve plate is fixedly disposed on the welded valve body. The inner ring of the second valve plate is rotatably inserted into the inner ring of the first valve plate. A guide rod is fixedly connected to the inner ring of the second valve plate. A spiral guide groove that cooperates with the guide rod is provided in the middle of the drive rod. The two ends of the spiral guide groove are connected to straight guide grooves that cooperate with the guide rod. When the guide rod is located in the straight guide groove away from the movable valve core, the flow-stopping device is in a fully closed state. When the guide rod is located in the straight guide groove close to the movable valve core, the flow-stopping device is in a fully open state.

[0009] Preferably, a closed cylinder is fixedly connected to the inner ring of the second valve plate, and a bearing is provided between the inner rings of the first valve plate and the second valve plate.

[0010] Preferably, the upper and lower ends of the movable valve core are welded with support plates, the middle of the support plate is provided with a mounting hole, the upper and lower ends of the ball are fixedly connected with support shafts that rotate with the mounting holes, and a sealing element is provided between the support shafts and the mounting holes;

[0011] Two floating valve seats are provided and located on the left and right sides of the inner cavity of the movable valve core. The side of the floating valve seat closer to the ball is provided with a rubber part that seals with the ball, and the side of the floating valve seat away from the ball is provided with a spring. The floating valve seat and the movable valve core are sealed together by a bellows II.

[0012] Preferably, the rotary drive mechanism includes a drive shaft and a telescopic universal joint, the drive shaft is rotatably disposed at the upper end of the welding valve body, and the drive shaft and the welding valve body are sealed together.

[0013] The upper end of the drive shaft is connected to a driver, and the lower end of the drive shaft is connected to the support shaft at the upper end of the ball via a telescopic universal joint.

[0014] Preferably, the welded valve body includes a left valve body, a middle valve body, a right valve body, and a valve cover. The left valve body, the middle valve body, and the right valve body are welded in sequence. The upper end of the middle valve body is provided with an opening for the telescopic universal joint to pass through. The valve cover is located at the upper end of the opening and is sealed and welded to the left valve body, the middle valve body, and the right valve body.

[0015] Preferably, the movable valve core includes a left valve core and a right valve core welded together.

[0016] Preferably, the rebound device includes a compression spring, which is disposed on the outside of the bellows I.

[0017] Preferably, the outer side of the bellows I is provided with a first annular plate and a second annular plate that are inserted into each other. The first annular plate is fixedly connected to the welded valve body, and the second annular plate is fixedly connected to the movable valve core.

[0018] Preferably, the central angle α of the sector plate is ≥90°, and a rubber sealing material is provided on the sealing surface of the sector plate;

[0019] A cross rod is fixedly connected to the movable valve core, and one end of the drive rod is connected to the cross rod through a connecting rod.

[0020] The beneficial effects of this invention compared to the prior art are as follows:

[0021] 1. This application establishes a pressure balancing mechanism consisting of a movable valve core, a rebound device, and a flow-stopping device. When the ball is closed, the medium pressure drives the movable valve core to compress the rebound device, which in turn closes the flow-stopping device. This ensures that the medium pressure is mainly borne by the flow-stopping device, while the ball only bears the elastic force provided by the rebound device. This significantly reduces the load on the ball under high-pressure conditions, effectively reduces friction and wear between the support shaft and the valve body, prevents ball position displacement, and significantly improves the sealing reliability and service life of the valve under high-pressure frequent opening and closing conditions.

[0022] 2. This application uses bellows I and bellows II to replace the dynamic sealing structures between the movable valve core and the valve body, and between the floating valve seat and the movable valve core, respectively. This not only reduces the installation difficulty of the sealing components, but also avoids direct contact between the medium or impurities and the sealing elements, thereby improving the stability and durability of the seal. It is especially suitable for harsh working conditions.

[0023] 3. The flow-stopping device, through the cooperation of the drive rod and the spiral guide groove, converts the linear motion of the movable valve core into the rotational motion of the second valve plate, realizing a synchronous flow-stopping function linked with the ball. The rotary drive mechanism uses a telescopic universal joint to connect the drive shaft and the ball support shaft, ensuring stable torque transmission even when the movable valve core moves axially. This guarantees the normal opening and closing operation of the ball during pressure balancing, improving the flexibility of valve control and the adaptability of the overall structure. Attached Figure Description

[0024] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] Figure 1 This is a cross-sectional view of the overall structure of the present invention;

[0026] Figure 2 for Figure 1 A magnified view of part A in the image;

[0027] Figure 3 for Figure 1 A magnified view of part B in the image;

[0028] Figure 4 for Figure 1 A magnified view of part C;

[0029] Figure 5 for Figure 1 A magnified view of part D;

[0030] Figure 6 This is an exploded view of the flow control device;

[0031] Figure 7 This is a schematic diagram of the second valve plate.

[0032] In the diagram: 1-Welded valve body; 11-Stepped hole; 12-Left valve body; 13-Middle valve body; 14-Right valve body; 15-Valve cover; 16-Opening; 2-Moving valve core; 21-Columnar structure; 22-Bellows I; 23-Support plate; 24-Support shaft; 25-Left valve core; 26-Right valve core; 27-First annular plate; 28-Second annular plate; 29-Cross rod; 3-Ball; 4-Floating valve seat; 41-Spring Spring; 42-Bellwall II; 5-Rotary drive mechanism; 51-Drive shaft; 52-Telescopic universal joint; 53-Driver; 6-Rebound device; 7-Blocking device; 71-Drive rod; 711-Helical guide groove; 712-Straight guide groove; 72-First valve plate; 721-Inner ring; 722-Outer ring; 723-Fan-shaped plate; 724-Rubber sealing material; 73-Second valve plate; 74-Guide rod; 75-Sealed cylinder. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example:

[0035] like Figures 1 to 7 As shown, a fully welded ball valve includes a welded valve body 1, a movable valve core 2, a ball 3, and a floating valve seat 4. The movable valve core 2 is slidably disposed inside the welded valve body 1, and both sides of the movable valve core 2 are sealed to the welded valve body 1 to prevent the medium from entering between the movable valve core 2 and the welded valve body 1 from the connection.

[0036] Both the ball 3 and the floating valve seat 4 are mounted on the movable valve core 2. The middle part of the movable valve core 2 is a through hole. The ball 3 is connected to a rotary drive mechanism 5. The opening and closing of the through hole is controlled by the cooperation of the ball 3 and the floating valve seat 4.

[0037] Specifically, support plates 23 are welded to both the upper and lower ends of the movable valve core 2. A mounting hole is provided in the middle of the support plate 23. Support shafts 24 that rotate with the mounting holes are fixedly connected to the upper and lower ends of the ball 3. A sealing element is provided between the support shaft 24 and the mounting hole. The ball 3 can rotate relative to the movable valve core 2.

[0038] Two floating valve seats 4 are provided and located on the left and right sides of the inner cavity of the movable valve core 2. The side of the floating valve seat 4 closer to the ball 3 is provided with a rubber part that seals with the ball 3, and the side of the floating valve seat 4 away from the ball 3 is provided with a spring 41. The spring 41 pushes the floating valve seat 4 to move towards the ball 3, ensuring the sealing between the ball 3 and the movable valve core 2.

[0039] The floating valve seat 4 and the movable valve core 2 are sealed together by a bellows II 42. The bellows II 42 replaces the O-ring seal in the existing technology, which reduces the installation difficulty of the seal and avoids the medium or impurities from contacting the O-ring and affecting the sealing effect of the O-ring.

[0040] In existing ball valves, when the ball is closed, the medium pressure acts entirely on the ball. When used in high-pressure conditions, the friction between the ball support shaft 24 and the valve body is significant, and frequent opening and closing can easily cause wear, leading to a displacement of the ball's position and ultimately affecting the valve's closing effect.

[0041] In order to reduce the pressure acting on the ball under high pressure conditions, this application adopts a structure with a floating valve core and a flow-blocking device.

[0042] Specifically, stepped holes 11 are provided on both the left and right sides of the inner cavity of the welded valve body 1. The movable valve core 2 has columnar structures 21 at both ends that slide in conjunction with the corresponding stepped holes 11. The movable valve core 2 is sealed to the corresponding stepped holes 11 via bellows I 22 to prevent media from flowing between the movable valve core 2 and the welded valve body 1. To improve the stability of the bellows I 22, a first annular plate 27 and a second annular plate 28 are provided on the outer side of the bellows I 22, which are interlocked. The first annular plate 27 is fixedly connected to the welded valve body 1, and the second annular plate 28 is fixedly connected to the movable valve core 2.

[0043] A spring-loaded device 6 is provided between the movable valve core 2 and the welded valve body 1 to drive the movable valve core 2 to move towards the medium inlet side of the welded valve body 1. In this embodiment, the spring-loaded device 6 is a compression spring, which is located on the outside of the bellows I 22. When the ball 3 is in the closed state, the pressure of the medium pushes the ball 3 and the movable valve core 2 to move towards the compression spring. At the same time as the movable valve core 2 moves, it drives the shut-off device 7 to close. The shut-off device 7 bears the pressure of the medium, while the pressure borne by the ball 3 depends on the spring force of the compression spring. At this time, the pressure borne by the ball 3 is much less than the pressure borne by the shut-off device 7.

[0044] Specifically, the flow-stopping device 7 is installed on the medium inlet side of the welded valve body 1. The flow-stopping device 7 includes a drive rod 71 and a first valve plate 72 and a second valve plate 73 rotatably connected. The drive rod 71 is fixedly connected to the movable valve core 2. When the movable valve core 2 moves, the drive rod 71 moves synchronously with it. Specifically, a cross rod 29 is fixedly connected to the movable valve core 2, and one end of the drive rod 71 is connected to the cross rod 29 through a connecting rod.

[0045] The first valve plate 72 and the second valve plate 73 both include an inner ring 721, an outer ring 722, and two sector plates 723 disposed between the inner ring 721 and the outer ring 722. The two sector plates 723 are centrally symmetrical, and the central angle α of the sector plates 723 is ≥90°. Preferably, the central angle α = 90°.

[0046] The first valve plate 72 is fixedly mounted on the welded valve body 1, and the inner ring 721 of the second valve plate 73 is rotatably inserted into the inner ring 721 of the first valve plate 72. Preferably, a bearing is provided between the inner rings 721 of the first valve plate 72 and the second valve plate 73 to reduce the rotational resistance of the second valve plate 73.

[0047] The inner ring 721 of the second valve plate 73 is fixedly connected to a guide rod 74. A spiral guide groove 711 that cooperates with the guide rod 74 is provided in the middle of the drive rod 71. The two ends of the spiral guide groove 711 are connected to straight guide grooves 712 that cooperate with the guide rod 74. When the drive rod 71 moves linearly, the guide rod 74 moves along the trajectory of the spiral guide groove 711 or the straight guide groove 712, thereby driving the second valve plate 73 to rotate.

[0048] When the guide rod 74 is located in the straight guide groove 712 away from the movable valve core 2, the two sector plates of the second valve plate 73 and the two sector plates of the first valve plate 72 are closed to block the medium; when the guide rod 74 is located in the straight guide groove 712 close to the movable valve core 2, the two sector plates of the second valve plate 73 and the two sector plates of the first valve plate 72 are opened.

[0049] A rubber sealing material 724 is provided on the sealing surface of the sector plate 723 to improve the sealing effect. A closed cylinder 75 is fixedly connected to the inner ring 721 of the second valve plate 73 to prevent the medium from passing through the straight guide groove 712 or the spiral guide groove 711 when the flow-stopping device 7 is closed.

[0050] To control the rotation of the ball 3, the rotary drive mechanism 5 includes a drive shaft 51 and a telescopic universal joint 52. The drive shaft 51 is rotatably mounted on the upper end of the welded valve body 1, and the lower end of the drive shaft 51 is connected to the support shaft 24 at the upper end of the ball 3 via the telescopic universal joint 52. The drive shaft 51 and the welded valve body 1 are sealed together. Using the telescopic universal joint 52, power transmission between the drive shaft 51 and the support shaft 24 is still ensured when the movable valve core 2 moves. An actuator 53 is connected to the upper end of the drive shaft 51. The actuator 53 uses an existing valve opening and closing control device, such as a handwheel or a motor.

[0051] To facilitate the assembly of internal parts, the welded valve body 1 includes a left valve body 12, a middle valve body 13, a right valve body 14, and a valve cover 15. The left valve body 12, the middle valve body 13, and the right valve body 14 are welded in sequence. The upper end of the middle valve body 13 is provided with an opening 16 for the telescopic universal joint 52 to pass through. The valve cover 15 is located at the upper end of the opening 16 and is sealed and welded to the left valve body 12, the middle valve body 13, and the right valve body 14.

[0052] The movable valve core 2 includes a left valve core 25 and a right valve core 26 that are welded together.

[0053] The above description only illustrates the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention, and all such changes should be included within the protection scope of the present invention.

Claims

1. A fully welded ball valve, characterized in that: It includes a welded valve body (1), a movable valve core (2), a ball (3) and a floating valve seat (4). The ball (3) and the floating valve seat (4) are both mounted on the movable valve core (2). The middle part of the movable valve core (2) is a through hole. The ball (3) is connected to a rotary drive mechanism (5). The ball (3) and the floating valve seat (4) cooperate to control the opening and closing of the through hole. The welded valve body (1) has stepped holes (11) on both the left and right sides of its inner cavity. The movable valve core (2) has columnar structures (21) at both ends that slide with the stepped holes (11) on the corresponding side. The movable valve core (2) is sealed with the stepped holes (11) on the corresponding side through bellows I (22). A spring-loaded device (6) is provided between the movable valve core (2) and the welded valve body (1) to drive the movable valve core (2) to move toward the medium inlet side of the welded valve body (1). The welded valve body (1) is provided with a flow-blocking device (7) on the medium inlet side. The flow-blocking device (7) includes a drive rod (71) and a first valve plate (72) and a second valve plate (73) rotatably connected. The drive rod (71) is fixedly connected to the movable valve core (2). The first valve plate (72) and the second valve plate (73) each include an inner ring (721), an outer ring (722), and two sector plates (723) disposed between the inner ring (721) and the outer ring (722). The two sector plates (723) are centrally symmetrical. The first valve plate (72) is fixedly disposed on the welded valve body (1), and the inner ring (721) of the second valve plate (73) is... The guide rod (74) is fixedly connected to the inner ring (721) of the first valve plate (72) and the inner ring (721) of the second valve plate (73). The drive rod (71) is provided with a spiral guide groove (711) that cooperates with the guide rod (74) in the middle. The two ends of the spiral guide groove (711) are connected to a straight guide groove (712) that cooperates with the guide rod (74). When the guide rod (74) is located in the straight guide groove (712) away from the movable valve core (2), the flow-stopping device (7) is in a fully closed state. When the guide rod (74) is located in the straight guide groove (712) close to the movable valve core (2), the flow-stopping device (7) is in a fully open state.

2. The all-welded ball valve according to claim 1, characterized in that: The inner ring (721) of the second valve plate (73) is fixedly connected to a closed cylinder (75), and a bearing is provided between the inner rings (721) of the first valve plate (72) and the second valve plate (73).

3. The all-welded ball valve according to claim 1, characterized in that: The upper and lower ends of the movable valve core (2) are welded with support plates (23), and the middle of the support plate (23) is provided with an installation hole. The upper and lower ends of the ball are fixedly connected with support shafts (24) that rotate with the installation hole. A sealing element is provided between the support shaft (24) and the installation hole. Two floating valve seats (4) are provided and are located on the left and right sides of the inner cavity of the movable valve core (2). A rubber part that seals with the ball (3) is provided on the side of the floating valve seat (4) closer to the ball (3), and a spring (41) is provided on the side of the floating valve seat (4) away from the ball (3). The floating valve seat (4) and the movable valve core (2) are sealed together by a bellows II (42).

4. A fully welded ball valve according to claim 3, characterized in that: The rotary drive mechanism (5) includes a drive shaft (51) and a telescopic universal joint (52). The drive shaft (51) is rotatably disposed at the upper end of the welding valve body (1), and the drive shaft (51) and the welding valve body (1) are sealed together. The upper end of the drive shaft (51) is connected to the driver (53), and the lower end of the drive shaft (51) is connected to the support shaft (24) at the upper end of the ball (3) through the telescopic universal joint (52).

5. A fully welded ball valve according to claim 1, characterized in that: The welded valve body (1) includes a left valve body (12), a middle valve body (13), a right valve body (14), and a valve cover (15). The left valve body (12), the middle valve body (13), and the right valve body (14) are welded in sequence. The upper end of the middle valve body (13) is provided with an opening (16) for the telescopic universal joint (52) to pass through. The valve cover (15) is located at the upper end of the opening (16) and is sealed and welded to the left valve body (12), the middle valve body (13), and the right valve body (14).

6. A fully welded ball valve according to claim 1, characterized in that: The movable valve core (2) includes a left valve core (25) and a right valve core (26) welded together.

7. A fully welded ball valve according to claim 1, characterized in that: The rebound device (6) includes a compression spring, which is disposed on the outside of the bellows I (22).

8. A fully welded ball valve according to claim 1, characterized in that: The outer side of the bellows I (22) is provided with a first annular plate (27) and a second annular plate (28) that are interlocked with each other. The first annular plate (27) is fixedly connected to the welded valve body (1), and the second annular plate (28) is fixedly connected to the movable valve core (2).

9. A fully welded ball valve according to claim 1, characterized in that: The central angle α of the sector plate (723) is ≥90°, and a rubber sealing material (724) is provided on the sealing surface of the sector plate (723). A cross rod (29) is fixedly connected to the movable valve core (2), and one end of the drive rod (71) is connected to the cross rod (29) through a connecting rod.

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