Pneumatic actuator for adjusting valve

Abstract

The utility model relates to the technical field of industrial automation and fluid control, and discloses a pneumatic actuator for an adjusting valve, which comprises a pipeline, a rotating rod is rotatably connected inside the pipeline, and a precise adjusting structure is arranged outside the rotating rod. According to the pneumatic actuator for adjusting the valve, accurate visualization and stable guiding of the opening degree of the valve are achieved through an accurate adjusting structure composed of a supporting rod, a fixing rod and a sealing plate and in combination with a limiting rod and scale marks, and the opening degree of the valve is adjusted through a transmission mechanism composed of a bidirectional cam, a movable rod, a sleeve rod and a built-in spring. Rotational motion is ingeniously converted into linear motion, output force is amplified, opening and closing of the valve are more labor-saving and efficient, impact and vibration in the motion process are effectively absorbed through the flexible design of the spring, tolerance between parts is compensated, and the service life of the valve is prolonged. Therefore, the adjusting precision, the operation stability, the impact resistance and the service life of the whole pneumatic actuator are comprehensively improved.

Description

Technical Field

[0001] This utility model relates to the field of industrial automation and fluid control technology, specifically a pneumatic actuator for regulating valves. Background Technology

[0002] Pneumatic actuators, with their advantages of simple structure, large output force, and explosion-proof safety, are widely used in process control in industries such as chemical, petroleum, power and metallurgy, serving as the core driving device for regulating valves.

[0003] First, in operating conditions requiring high-frequency, short-stroke fine-tuning, the continuous friction between the actuator's sealing elements and the valve stem or piston rod easily leads to rapid wear of the seals, causing internal leakage, reduced output force, or even failure of the actuator. This results in short equipment maintenance cycles and high operating costs. Second, the valve position feedback accuracy of most actuators is easily affected by ambient temperature fluctuations. The characteristics of the electronic components of their internal displacement or angle sensors drift with temperature, causing the valve position signal received by the control system to be inaccurate. This results in a deviation between the actual valve opening and the set value, seriously affecting the regulation quality and process stability of the entire control loop. Therefore, a pneumatic actuator for regulating valves is proposed to solve the above problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a pneumatic actuator for regulating valves, which has the advantages of high adjustment accuracy, good sealing and wear resistance, and stable and reliable operation. It effectively solves the problems of easy wear of seals under high-frequency fine adjustment, large temperature influence on valve position feedback, and impact and dead zone in transmission of traditional actuators.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pneumatic actuator for regulating valves, comprising a pipe, wherein a rotating rod is rotatably connected inside the pipe, and a precision adjustment structure is provided outside the rotating rod;

[0006] The precision adjustment structure includes a support rod, a fixed rod hinged to the support rod, a sealing plate fixedly connected to the fixed rod, and a valve fixedly connected to the top of the pipe.

[0007] Preferably, a limiting rod is fixedly connected inside the pipe, and the limiting rod is provided with scale lines on its outside.

[0008] Preferably, there are two limiting rods, and the limiting rods are slidably connected to the sealing plate.

[0009] Preferably, a sealed chamber is formed between the sealing plate and the inner wall of the pipe, an air inlet is provided on the outside of the pipe and the air inlet is connected to the sealed chamber, and a pressure sensor is fixedly connected to the inner wall of the pipe and the pressure sensor is located inside the sealed chamber.

[0010] Preferably, a bidirectional cam is fixedly connected to the outside of the rotating rod, a movable rod is hinged to the bidirectional cam, a sleeve is slidably connected to the outside of the movable rod, a limit block is fixedly connected to one end of the movable rod, and the limit block is slidably connected to the inside of the sleeve.

[0011] Preferably, one end of the sleeve rod is hinged to the sealing plate, the limiting block is fixedly connected to a spring, one end of the spring is fixedly connected to the limiting block, the other end is fixedly connected to the sleeve rod, and the movable rod is located inside the spring.

[0012] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0013] This pneumatic actuator for regulating valves utilizes a precise adjustment structure consisting of a support rod, a fixed rod, and a sealing plate. Combined with a limit rod and scale lines, it achieves precise visualization and stable guidance of valve opening, significantly improving the accuracy of flow control. Simultaneously, a pressure sensor monitors the pressure of the sealing chamber formed by the sealing plate and the inner wall of the pipe, constructing a pneumatic feedback closed-loop control mechanism that enhances the automation and reliability of regulation. Furthermore, a transmission mechanism composed of a bidirectional cam, a movable rod, a sleeve rod, and a built-in spring cleverly converts rotary motion into linear motion. This not only amplifies the output force, making valve opening and closing more effortless and efficient, but the flexible design of the spring effectively absorbs impacts and vibrations during movement, compensating for tolerances between components. This comprehensively improves the overall adjustment accuracy, operational stability, impact resistance, and service life of the pneumatic actuator. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a front sectional view of the structure of this utility model;

[0016] Figure 3 This is a rear sectional view of the structure of this utility model;

[0017] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0018] In the diagram: 1. Pipe; 2. Rotating rod; 3. Precision adjustment structure; 301. Support rod; 302. Fixing rod; 303. Sealing plate; 304. Limiting rod; 305. Scale line; 306. Pressure sensor; 307. Valve; 4. Bidirectional cam; 5. Sleeve rod; 6. Movable rod; 7. Spring; 8. Limiting block; 9. Air inlet; 10. Observation window. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4 In this embodiment, a pneumatic actuator for regulating valve includes a pipe 1, a rotating rod 2 is rotatably connected inside the pipe 1, and a precision adjustment structure 3 is provided outside the rotating rod 2.

[0021] The precision adjustment structure 3 includes a support rod 301, a fixed rod 302 is hinged to the support rod 301, a sealing plate 303 is fixedly connected to the fixed rod 302, and a valve 307 is fixedly connected to the top of the pipe 1.

[0022] The pipe 1 is internally fixedly connected to a limit rod 304, and the limit rod 304 is externally provided with a scale line 305. The limit rod 304 itself provides a stable sliding track for the movement of the sealing plate 303, preventing it from deflecting or getting stuck during the adjustment process and ensuring the linearity of the movement. The scale line 305 acts like a ruler, allowing the operator to directly and accurately read the current valve opening by observing the relative position of the sealing plate 303 on the limit rod 304, thereby realizing precise monitoring and adjustment of the medium flow.

[0023] There are two limit rods 304, which are slidably connected to the sealing plate 303 to enhance the balance and stability of the sealing plate 303 during movement. By setting two symmetrically distributed limit rods 304, the two ends of the sealing plate 303 can be effectively constrained, so that it will not experience unilateral wear or tilting when subjected to fluid pressure. This ensures the integrity of the sealing surface between the sealing plate 303 and the inner wall of the pipe 1, thereby improving the reliability and service life of the entire actuator.

[0024] A sealed chamber is formed between the sealing plate 303 and the inner wall of the pipe. An air inlet 9 is provided on the outside of the pipe 1, and the air inlet 9 is connected to the sealed chamber. A pressure sensor 306 is fixedly connected to the inner wall of the pipe 1. The pressure sensor 306 is located inside the sealed chamber. An external air source can inject compressed air into the sealed chamber through the air inlet 9 to drive the sealing plate 303 to move. The pressure sensor 306 monitors the pressure value inside the sealed chamber in real time. This pressure value is directly related to the force acting on the sealing plate 303 and the opening degree of the valve 307.

[0025] The rotating rod 2 is externally fixedly connected to a bidirectional cam 4, which is hinged to a movable rod 6. The movable rod 6 is externally slidably connected to a sleeve rod 5. One end of the movable rod 6 is fixedly connected to a limit block 8, which is slidably connected inside the sleeve rod 5. When the rotating rod 2 rotates, it drives the bidirectional cam 4 to rotate. The cam profile pushes or releases the movable rod 6, causing the movable rod 6 to slide inside the sleeve rod 5. This cam-lever combination mechanism can amplify a small input torque and convert it into the force required to drive the sealing plate 303, thereby realizing the precise adjustment of the valve 307 opening with a small control force. It is particularly suitable for occasions that require a large closing force.

[0026] One end of the sleeve rod 5 is hinged to the sealing plate 303. A spring 7 is fixedly connected to the limiting block 8. One end of the spring 7 is fixedly connected to the limiting block 8, and the other end is fixedly connected to the sleeve rod 5. The movable rod 6 is located inside the spring 7. The spring 7 is pre-compressed between the limiting block 8 and the sleeve rod 5. When the bidirectional cam 4 pushes the movable rod 6, the force is transmitted to the sealing plate 303 through the spring 7 and the sleeve rod 5 to open or close it. This design can utilize the force of the spring 7 to assist the rapid closing of the valve 307. On the other hand, the spring 7, as a flexible element, can absorb the impact generated by the system during start-up, shutdown, or pressure fluctuations, protect mechanical parts from rigid collisions, and compensate for minor manufacturing errors or thermal expansion and contraction to ensure the reliability of the seal.

[0027] When implementing this procedure, please follow these steps:

[0028] 1) First, manually or through the control system drive the rotating rod 2 to rotate, so that the sealing plate 303 moves to the fully closed or preset initial position indicated by the scale line 305 on the limit rod 304, to ensure that the valve 307 is in a safe and known state;

[0029] 2) Then reliably connect the external pneumatic pipeline to the air inlet 9 on the pipeline 1, and then set the target pressure value or target opening value in the control system according to the control requirements.

[0030] 3) Restart the system. Compressed air enters the sealed chamber formed by the sealing plate 303 and the inner wall of the pipe 1 through the air inlet 9, pushing the sealing plate 303 to move. During this process, the pressure sensor 306 monitors the pressure of the sealed chamber in real time. At the same time, the operator can read the scale line 305 through the observation window 10 to monitor the position of the sealing plate 303, realizing visual and feedback dual calibration of the opening degree.

[0031] 4) Finally, when the pressure sensor 306 feedback data reaches the set value and the sealing plate 303 is stable, the system maintains the air source pressure. The rotating rod 2 achieves dynamic balance under the transmission mechanism composed of the bidirectional cam 4, the movable rod 6 and the sleeve rod 5 and the buffering effect of the spring 7, which stabilizes the sealing plate 303 at the target opening. The equipment enters a stable working state and performs continuous monitoring.

[0032] In summary, this pneumatic actuator for regulating valves, through the precise adjustment structure 3 consisting of support rod 301, fixed rod 302, and sealing plate 303, combined with limit rod 304 and scale line 305, achieves precise visualization and stable guidance of the valve 307 opening, significantly improving the accuracy of flow control. Simultaneously, the pressure sensor 306 monitors the pressure of the sealing chamber formed by the sealing plate 303 and the inner wall of pipe 1, constructing a pneumatic feedback closed-loop control mechanism, enhancing the automation and reliability of regulation. Furthermore, through the transmission mechanism composed of bidirectional cam 4, movable rod 6, sleeve rod 5, and built-in spring 7, rotary motion is cleverly converted into linear motion, not only amplifying the output force and making the opening and closing of valve 307 more effortless and efficient, but also the flexible design of spring 7 effectively absorbs the impact and vibration during the movement, compensating for the tolerances between components, thereby comprehensively improving the overall adjustment accuracy, operational stability, impact resistance, and service life of the pneumatic actuator.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0034] 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 pneumatic actuator for regulating valves, comprising a pipeline (1), characterized in that: The pipe (1) is rotatably connected to a rotating rod (2), and a precision adjustment structure (3) is provided on the outside of the rotating rod (2). The precision adjustment structure (3) includes a support rod (301), which is hinged to a fixing rod (302). The fixing rod (302) is fixedly connected to a sealing plate (303), and a valve (307) is fixedly connected to the top of the pipe (1).

2. The pneumatic actuator for regulating valves according to claim 1, characterized in that: The pipe (1) is fixedly connected to a limiting rod (304), and the limiting rod (304) is provided with scale lines (305) on its outside.

3. A pneumatic actuator for a regulating valve according to claim 2, characterized in that: There are two limiting rods (304), and the limiting rods (304) are slidably connected to the sealing plate (303).

4. A pneumatic actuator for a regulating valve according to claim 1, characterized in that: A sealed chamber is formed between the sealing plate (303) and the inner wall of the pipe. An air inlet (9) is provided on the outside of the pipe (1). The air inlet (9) is connected to the sealed chamber. A pressure sensor (306) is fixedly connected to the inner wall of the pipe (1). The pressure sensor (306) is located inside the sealed chamber.

5. A pneumatic actuator for a regulating valve according to claim 1, characterized in that: The rotating rod (2) is fixedly connected to a bidirectional cam (4), the bidirectional cam (4) is hinged to a movable rod (6), the movable rod (6) is slidably connected to a sleeve rod (5), one end of the movable rod (6) is fixedly connected to a limit block (8), and the limit block (8) is slidably connected to the inside of the sleeve rod (5).

6. A pneumatic actuator for a regulating valve according to claim 5, characterized in that: One end of the sleeve rod (5) is hinged to the sealing plate (303), and the limiting block (8) is fixedly connected to the spring (7). One end of the spring (7) is fixedly connected to the limiting block (8), and the other end is fixedly connected to the sleeve rod (5). The movable rod (6) is located inside the spring (7).

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