Self-control pneumatic high-pressure hard sealing ball valve

Abstract

The utility model relates to the technical field of valve production, and discloses a self-control pneumatic high-pressure hard sealing ball valve which comprises a valve body, a ball valve body is arranged in the valve body, a valve rod is fixedly connected to the outer wall of the ball valve body, and a limiting assembly is arranged at the bottom of a rotating shaft. According to the self-control pneumatic high-pressure hard sealing ball valve, torque applied by the rotating shaft enables the spring to deform longitudinally, the connecting block slides by a certain distance in the axial direction in the rotating shaft, the connecting block slides relatively along the inclined face of the pin shaft, excessive rotation of the valve rod and the ball valve is avoided, and then the service life of the device is prolonged; the maximum rotation angle of the limiting plate and the valve rod is made to be 90 degrees, then excessive rotation of the ball valve is prevented, at the moment, only the preset stroke of the pneumatic actuator needs to be increased, not-in-place rotation or excessive rotation of the ball valve can be prevented, the stability of the device is improved, the movable block slides in the sliding rail, and the motion trail of the pin shaft is stabilized.

Description

Technical Field

[0001] This utility model relates to the field of valve manufacturing technology, specifically to a self-controlled pneumatic high-pressure hard-seal ball valve. Background Technology

[0002] In thermal power plants, petrochemical systems, and coal chemical industries, valve selection is crucial for media such as those with temperatures exceeding 200°C, high-viscosity fluids, mixed fluids containing dust and solid particles, and highly corrosive fluids.

[0003] According to a public announcement of an automated pneumatic high-pressure hard-seal ball valve (announcement number: CN212107004U), the above application includes a ball, a middle body respectively located on the upper and lower sides of the ball, and left and right bodies respectively located on the periphery of the ball. The middle body and the left and right bodies are spliced ​​and fixed, and a gap is left between the middle body and the ball. The upper and lower ends of the ball are respectively fitted with capless valve seats. The ball is connected to the left and right bodies through the capless valve seats, and a spring is provided between the left and right bodies and the capless valve seats to make the capless valve seats abut against the ball. The ball has a full-bore pipe.

[0004] However, in actual use, the seals inside the pneumatic actuator may age, wear, or deform over a long period of time, leading to gas leakage or increased frictional resistance, which in turn affects the actuator's action accuracy, causing incomplete or excessive rotation. This can result in the valve being unable to adjust precisely, or even damage or excessive wear of the valve, thus affecting its stability. In view of this, we propose a self-controlled pneumatic high-pressure hard-seal ball valve. Utility Model Content

[0005] The purpose of this invention is to provide a self-controlled pneumatic high-pressure hard-seal 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 self-controlled pneumatic high-pressure hard-seal ball valve, comprising a valve body, a ball valve disposed inside the valve body, a valve stem fixedly connected to the outer wall of the ball valve, a pneumatic actuator fixedly connected to the outer wall of the valve body, a rotating shaft fixedly connected to the output end of the pneumatic actuator, and a limit assembly disposed at the bottom of the rotating shaft, the limit assembly comprising:

[0007] A spring is fixedly connected to the inner top surface of the rotating shaft, and a connecting block is fixedly connected to the bottom end of the spring.

[0008] A pin is provided at the bottom of the connecting block, and movable blocks are fitted at both ends of the pin.

[0009] A limiting plate is fixedly connected to the outer wall of the valve stem, and a limiting component is fixedly connected to the inner wall of the valve body. The limiting component is arranged in a crescent shape.

[0010] Preferably, the bottom of the connecting block is provided with a slot, the inner top surface of the slot abuts against the pin, and the top of the valve stem is provided with a slot, the inner bottom surface of the slot abuts against the pin.

[0011] Preferably, the pin is hexagonal prism, and the inner wall of the valve body is provided with a sliding track, which is slidably connected to the movable block.

[0012] Preferably, connecting rods are fixedly connected to both ends of the pin, and coil springs are fixedly connected to the side walls of the connecting rods. The end of the coil spring away from the connecting rod is fixedly connected to the inner wall of the movable block.

[0013] Preferably, the connecting block is slidably connected to the inner wall of the rotating shaft, and the outer diameter of the connecting block is equal to the inner diameter of the rotating shaft, so that the connecting block can move longitudinally within the rotating shaft.

[0014] Preferably, there are two sets of limiting plates, and the two sets of limiting plates abut against the limiting member, so that the limiting member makes the maximum rotation angle of the limiting plate and the valve stem 90°.

[0015] Compared with the prior art, this utility model provides a self-controlled pneumatic high-pressure hard-seal ball valve, which has the following advantages:

[0016] 1. This self-controlled pneumatic high-pressure hard-seal ball valve, through the setting of a limiting component, causes the spring to deform longitudinally when the torque applied by the rotating shaft is applied. The connecting block slides a certain distance along the axial direction within the rotating shaft, and the connecting block generates a relative sliding along the inclined surface of the pin shaft, preventing excessive rotation of the valve stem and ball valve, thereby extending the life of the device. Due to the setting of the limiting component, the maximum rotation angle of the limiting plate and the valve stem is 90°, thus preventing excessive rotation of the ball valve. At this time, it is only necessary to adjust the preset stroke of the pneumatic actuator to increase, which can prevent the ball valve from not rotating to the correct position or from rotating excessively, improving the stability of the device. When the valve stem rotates, the two ends of the pin shaft are sleeved with the movable block, and the movable block slides in the sliding track, which can stabilize the movement trajectory of the pin shaft, avoid shaking or deviation during the movement, and improve the accuracy of the valve stem rotation.

[0017] 2. This self-controlled pneumatic high-pressure hard-seal ball valve, through the connecting rod and coil spring, when the rotating shaft drives the connecting block to rotate in the opposite direction, the coil spring drives the pin to rotate in the opposite direction through elastic deformation, assisting the pin to return to its original position, ensuring that it is in the initial correct position in the next action, and reducing the risk of jamming. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of the present utility model;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the valve body of this utility model;

[0020] Figure 3 This is a schematic diagram of the limiting component structure of this utility model;

[0021] Figure 4 This utility model Figure 3 Schematic diagram of the structure of region A in the middle;

[0022] Figure 5 This is a schematic diagram of the sliding track structure of this utility model;

[0023] Figure 6 This is a schematic diagram of the cross-sectional structure of the rotating shaft of this utility model;

[0024] Figure 7 This is a schematic diagram of the movable block structure of this utility model.

[0025] In the diagram: 1. Valve body; 2. Ball valve; 3. Valve stem; 4. Pneumatic actuator; 5. Rotary shaft; 6. Limiting assembly; 601. Spring; 602. Connecting block; 603. Pin; 604. Limiting plate; 605. Movable block; 606. Limiting element; 607. Sliding rail; 7. Connecting rod; 8. Coil spring. Detailed Implementation

[0026] like Figures 1-7 As shown, this utility model provides a technical solution: a self-controlled pneumatic high-pressure hard-seal ball valve, including a valve body 1, a ball valve 2 is disposed inside the valve body 1, a valve stem 3 is fixedly connected to the outer wall of the ball valve 2, a pneumatic actuator 4 is fixedly connected to the outer wall of the valve body 1, a rotating shaft 5 is fixedly connected to the output end of the pneumatic actuator 4, a limit component 6 is disposed at the bottom of the rotating shaft 5, and the limit component 6 includes a spring 601, a connecting block 602, a pin 603, a limit plate 604, a movable block 605, a limit member 606, and a sliding track 607.

[0027] In one embodiment of this utility model, a spring 601 is fixedly connected to the inner top surface of a rotating shaft 5, and a connecting block 602 is fixedly connected to the bottom end of the spring 601. The outer diameter of the connecting block 602 is equal to the inner diameter of the rotating shaft 5, and the connecting block 602 can move longitudinally within the rotating shaft 5.

[0028] The pin 603 is located at the bottom of the connecting block 602. The bottom of the connecting block 602 has a slot, and the inner top surface of the slot abuts against the pin 603. The top of the valve stem 3 has a slot, and the inner bottom surface of the slot abuts against the pin 603. The connecting block 602 is slidably connected to the inner wall of the rotating shaft 5. The pin 603 is hexagonal prism. The inner wall of the valve body 1 has a sliding track 607, which is slidably connected to the movable block 605. Movable blocks 605 are sleeved at both ends of the pin 603.

[0029] The limiting plate 604 is fixedly connected to the outer wall of the valve stem 3, and the inner wall of the valve body 1 is fixedly connected to the limiting component 606. The limiting component 606 is crescent-shaped. There are two sets of limiting plates 604. The two sets of limiting plates 604 abut against the limiting component 606. The limiting component 606 makes the maximum rotation angle of the limiting plate 604 and the valve stem 3 90°.

[0030] The pneumatic actuator 4 drives the rotating shaft 5 to rotate. The rotation of the rotating shaft 5 drives the connecting block 602, the pin 603, and the valve stem 3 to rotate. The valve stem 3 drives the ball valve 2 to rotate. Due to the setting of the limiting component 606, the maximum rotation angle of the limiting plate 604 and the valve stem 3 is 90°, thereby preventing the ball valve 2 from rotating excessively.

[0031] When the valve stem 3 rotates, the two ends of the pin 603 are engaged with the movable block 605. The movable block 605 slides in the sliding track 607, which can stabilize the movement trajectory of the pin 603, avoid shaking or deviation during the movement, and improve the accuracy of the valve stem 3 rotation.

[0032] When the valve stem 3 and the connecting block 602 are blocked by the limiting member 606, if the pneumatic actuator 4 is still driving the rotating shaft 5 to rotate, the torque applied by the rotating shaft 5 will cause the spring 601 to deform longitudinally, and the connecting block 602 will slide a certain distance along the axial direction inside the rotating shaft 5. The connecting block 602 will generate a relative sliding along the inclined surface of the pin 603, which will prevent the valve stem 3 and the ball valve 2 from rotating excessively, thereby extending the life of the device. At this time, it is only necessary to adjust the preset stroke of the pneumatic actuator 4 to prevent the ball valve 2 from rotating incompletely or excessively, thereby improving the stability of the device.

[0033] In addition, connecting rods 7 are fixedly connected to both ends of the pin 603, and coil springs 8 are fixedly connected to the side walls of the connecting rods 7. The end of the coil spring 8 away from the connecting rods 7 is fixedly connected to the inner wall of the movable block 605. When the connecting block 602 slides relative to the inclined surface of the pin 603, the pin 603 may rotate off-center. If this off-center is not corrected, the pin 603 may not be able to accurately transmit torque or action in the next operation. When the rotating shaft 5 drives the connecting block 602 to rotate in the opposite direction, the coil spring 8 drives the pin 603 to rotate in the opposite direction through elastic deformation, assisting the pin 603 to return to its original position and ensuring that it is in the initial correct position in the next operation, reducing the risk of jamming.

[0034] In this invention, during use, the pneumatic actuator 4 drives the rotating shaft 5 to rotate. The rotation of the rotating shaft 5 drives the connecting block 602, the pin 603, and the valve stem 3 to rotate. The valve stem 3 drives the ball valve 2 to rotate. Due to the setting of the limiting member 606, the maximum rotation angle of the limiting plate 604 and the valve stem 3 is 90°. If the pneumatic actuator 4 continues to drive the rotating shaft 5 to rotate, the torque applied by the rotating shaft 5 will cause the spring 601 to undergo longitudinal deformation. The connecting block 602 will slide a certain distance along the axial direction inside the rotating shaft 5. The connecting block 602 will generate a relative sliding along the inclined surface of the pin 603, avoiding excessive rotation of the valve stem 3 and the ball valve 2, thereby extending the life of the device. At this time, it is only necessary to adjust the preset stroke of the pneumatic actuator 4 to increase, which can prevent the ball valve 2 from rotating incompletely or excessively, and improve the stability of the device.

[0035] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A self-controlled pneumatic high-pressure hard-seal ball valve, comprising a valve body (1), wherein a ball valve (2) is disposed inside the valve body (1), and a valve stem (3) is fixedly connected to the outer wall of the ball valve (2), characterized in that: A pneumatic actuator (4) is fixedly connected to the outer wall of the valve body (1). A rotating shaft (5) is fixedly connected to the output end of the pneumatic actuator (4). A limit assembly (6) is provided at the bottom of the rotating shaft (5). The limit assembly (6) includes: A spring (601) is fixedly connected to the inner top surface of the rotating shaft (5), and a connecting block (602) is fixedly connected to the bottom end of the spring (601). A pin (603) is provided at the bottom of the connecting block (602), and movable blocks (605) are sleeved at both ends of the pin (603); A limiting plate (604) is fixedly connected to the outer wall of the valve stem (3), and a limiting component (606) is fixedly connected to the inner wall of the valve body (1). The limiting component (606) is arranged in a crescent shape.

2. The self-controlled pneumatic high-pressure hard-seal ball valve according to claim 1, characterized in that: The bottom of the connecting block (602) is provided with a slot, the inner top surface of the slot abuts against the pin (603), and the top of the valve stem (3) is provided with a slot, the inner bottom surface of the slot abuts against the pin (603).

3. The self-controlled pneumatic high-pressure hard-seal ball valve according to claim 1, characterized in that: The pin (603) is arranged in the shape of a hexagonal prism, and the inner wall of the valve body (1) is provided with a sliding track (607), which is slidably connected to the movable block (605).

4. The self-controlled pneumatic high-pressure hard-seal ball valve according to claim 1, characterized in that: The two ends of the pin (603) are fixedly connected to the connecting rod (7), and the side wall of the connecting rod (7) is fixedly connected to the coil spring (8). The end of the coil spring (8) away from the connecting rod (7) is fixedly connected to the inner wall of the movable block (605).

5. The self-controlled pneumatic high-pressure hard-seal ball valve according to claim 1, characterized in that: The connecting block (602) is slidably connected to the inner wall of the rotating shaft (5), and the outer diameter of the connecting block (602) is equal to the inner diameter of the rotating shaft (5).

6. The self-controlled pneumatic high-pressure hard-seal ball valve according to claim 1, characterized in that: The number of the limiting plates (604) is provided in two sets, and the two sets of the limiting plates (604) abut against the limiting member (606).

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