A pneumatic actuator

Abstract

The application belongs to the technical field of industrial control equipment, and particularly relates to a pneumatic actuator. The application provides a pneumatic actuator, which comprises: an air inlet assembly and a redundant anti-refusal assembly, the air outlet of the air inlet assembly is in communication with the redundant anti-refusal assembly; the redundant anti-refusal assembly comprises: two parallel FO function two-position three-way electromagnetic valves, and the air inlet ends of the FO function two-position three-way electromagnetic valves are in communication with the air outlet of the air inlet assembly. In the pneumatic actuator provided by the application, the parallel design of the two FO function two-position three-way electromagnetic valves effectively avoids the problem of refusal caused by single-point failure, guarantees the operation stability, does not contain a positioner, effectively simplifies the structure, reduces the failure points and maintenance costs, and solves the technical defects of the prior art, i.e., the refusal risk of the pneumatic actuator and the high system complexity.

Description

Technical Field

[0001] This application belongs to the field of industrial control equipment technology, and in particular relates to a pneumatic actuator. Background Technology

[0002] FO (Fail-Open) is a core fail-safe mode in industrial control, especially in valve control scenarios. When the driving energy (such as air or electricity) is interrupted, the control signal is lost, or the equipment malfunctions, the actuator will automatically reset to the fully open state, maintaining the normal flow of media or air. This ensures system flow to prevent equipment damage or process disruption. In the event of air supply interruption, power failure, or other fault conditions, the valve will automatically open to relieve pressure, vent, or open an emergency passage, preventing safety accidents such as equipment overpressure and media leakage, ensuring the stability of the production system and the safety of personnel. It is widely used in industries such as power, chemical, oil and gas, and metallurgy.

[0003] In existing technologies, common FO (Fluid Optimizer) control modes include single solenoid valve control mode or redundant control mode with positioner. The single solenoid valve control mode uses a single two-position three-way solenoid valve with FO function as the core control element. Under normal operating conditions, the solenoid valve is energized and conducts, and the air source drives the actuator to keep the valve closed. In case of failure, the solenoid valve is de-energized and exhausts air, and the actuator drives the valve to open. The redundant control mode with positioner adds an intelligent positioner and a parallel structure of two solenoid valves to the single solenoid valve to solve the single point of failure problem. However, its structure is complex and has technical defects such as high risk of failure to operate, prominent hidden danger of false operation, and high maintenance cost.

[0004] Therefore, developing a pneumatic actuator to address the technical shortcomings of existing pneumatic actuators, such as the risk of failure to operate and the high complexity of the system, has become an urgent problem for those skilled in the art. Summary of the Invention

[0005] Therefore, it is necessary to provide a pneumatic actuator that addresses the technical shortcomings of existing pneumatic actuators, such as the risk of failure to operate and the high complexity of the system.

[0006] This application provides a pneumatic actuator, which includes an air inlet assembly and a redundant anti-rejection assembly, wherein the air outlet of the air inlet assembly is connected to the redundant anti-rejection assembly. The redundant anti-rejection assembly includes two parallel FO-function two-position three-way solenoid valves, the air inlet of which is connected to the air outlet of the air inlet assembly.

[0007] In one embodiment, the pneumatic actuator further includes a malfunction protection component, which is connected to the outlet end of the FO function two-position three-way solenoid valve.

[0008] In one embodiment, the malfunction protection component includes an adjustable flow valve, which is installed at the outlet end of the FO function two-position three-way solenoid valve.

[0009] In one embodiment, the pneumatic actuator further includes an air source processing component, which is disposed in front of the air inlet of the air inlet component and is used to purify or drain the gas entering the pneumatic actuator.

[0010] In one embodiment, the gas source processing assembly includes a filter section and a drain section, wherein the filter section and the drain section are connected in series.

[0011] In one embodiment, the filtration unit includes a first filter, a second filter, and a third filter, which are arranged sequentially along the air inlet of the filtration unit. The first filter includes an impurity filter element, the second filter includes an oil filter element, and the third filter includes a moisture filter element.

[0012] In one embodiment, the intake assembly includes a pressure regulating valve and an airflow regulating valve, wherein the airflow entering the intake assembly passes sequentially through the airflow regulating valve and the pressure regulating valve.

[0013] In one embodiment, the pneumatic actuator further includes a pressure monitoring component, which is disposed at the outlet end of the redundant anti-rejection component or the inlet end of the air source processing component.

[0014] In one embodiment, the pneumatic actuator further includes an emergency maintenance component, which is respectively disposed at the inlet and outlet of the FO function two-position three-way solenoid valve, for manually disconnecting the FO function two-position three-way solenoid valve from the airflow passage.

[0015] In one embodiment, the emergency maintenance component includes a handwheel.

[0016] In summary, this application provides a pneumatic actuator, including: an air inlet assembly and a redundant anti-misoperation assembly, wherein the air outlet of the air inlet assembly is connected to the redundant anti-misoperation assembly; the redundant anti-misoperation assembly includes: two parallel FO-function two-position three-way solenoid valves, the air inlet of which is connected to the air outlet of the air inlet assembly. The pneumatic actuator provided in this application, through the parallel design of two FO-function two-position three-way solenoid valves, effectively avoids the problem of misoperation caused by a single point of failure, ensuring operational stability. Simultaneously, it eliminates the need for a positioner, effectively simplifying the structure and reducing failure points and maintenance costs; it solves the technical defects of existing pneumatic actuators, such as the risk of misoperation and high system complexity. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of a pneumatic actuator provided in the embodiments of this application; Figure 2 A partially enlarged schematic diagram of the connection between the FO function two-position three-way solenoid valve and the adjustable flow valve in a pneumatic actuator provided in this application embodiment; Figure 3 A schematic diagram of the working process of a pneumatic actuator under different working conditions is provided in the technical solution of the embodiments of this application; The components include: intake assembly 1, redundant anti-misoperation assembly 2, FO function two-position three-way solenoid valve 21, maloperation protection assembly 3, adjustable flow valve 31, air source treatment assembly 4, pressure monitoring assembly 5, and emergency maintenance assembly 6. Detailed Implementation

[0019] This application provides a pneumatic actuator to address the technical shortcomings of existing pneumatic actuators, such as the risk of failure to operate and high system complexity.

[0020] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0021] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0026] In order to clearly and completely explain the technical effects of the pneumatic actuator provided in the embodiments of this application, the following is a brief explanation of the technical defects of the common single solenoid valve control mode and the redundant control mode with positioner in the prior art.

[0027] 1. High risk of failure to operate: If the FO, which adopts a single-point solenoid valve design, experiences a fault such as coil burnout, valve core jamming, or air circuit blockage, it will directly cause the FO function to fail and the valve to fail to open. The root cause is the lack of an effective redundancy backup mechanism. Although the redundant control structure with a positioner has dual solenoid valve redundancy, the addition of the positioner increases the system complexity. Positioner failure is prone to triggering a chain failure and does not fundamentally optimize the redundant response logic of the solenoid valve itself.

[0028] 2. Significant risk of malfunction: Neither type of solenoid valve has a throttling device at the exhaust port. When a single solenoid valve loses power unexpectedly (such as due to signal interference or power fluctuations), the exhaust volume becomes uncontrollable and can easily reach the actuator's action threshold, causing the valve to open unexpectedly and resulting in production fluctuations. The exhaust volume is not precisely controlled for single-point failures.

[0029] 3. System complexity and redundancy of fault points: The redundant control structure with positioner can achieve precise valve position adjustment, but it is not necessary for FO safety scenarios that only require on and off control (such as pressure relief valves and vent valves). Instead, it increases equipment cost, installation difficulty and fault points (such as positioner calibration drift and line faults). Over-design leads to insufficient system adaptability.

[0030] 4. High maintenance costs and lack of early warning: Existing technology lacks real-time monitoring of parameters such as solenoid valve status and air circuit pressure. Faults can only be discovered after the fact, resulting in a large number of unplanned shutdowns.

[0031] Based on the aforementioned technical deficiencies, this application provides a pneumatic actuator to address the technical shortcomings of existing pneumatic actuators, such as the risk of failure to operate and high system complexity.

[0032] Please see Figure 1This application provides a pneumatic actuator, including an air intake assembly 1 and a redundant anti-failure assembly 2. The air outlet of the air intake assembly is connected to the redundant anti-failure assembly 2. The redundant anti-failure assembly 2 includes two parallel FO-function two-position three-way solenoid valves 21, the air inlet of which is connected to the air outlet of the air intake assembly 1. This is used to solve the technical defects of high failure risk and complex system structure of pneumatic actuators in the prior art.

[0033] The technical solution provided in this application includes a pneumatic actuator comprising an air intake assembly 1 and a redundant anti-rejection assembly 2 to ensure the stability and reliability of overall operation. The air intake assembly 1 is connected to a stable air source, and its outlet is connected to the redundant anti-rejection assembly 2, providing continuous and stable gas power support for the entire actuator and ensuring the smoothness of subsequent air path control. The redundant anti-rejection assembly 2 includes two parallel-connected FO-function two-position three-way solenoid valves 21, the inlet of which is connected to the outlet of the air intake assembly 1, forming a complete air path control loop. In practical applications, the FO-function two-position three-way solenoid valves 21 can be set to a pressure threshold of 0.6 MPa, but this does not constitute a limitation on the scope of protection of this application.

[0034] The single FO-function two-position three-way solenoid valve 21 has two operating positions and three air circuit interfaces: P port for air supply, A port for actuator access, and R port for exhaust. Under normal operating conditions, the valve core is switched via electromagnetic signals to control air circuit opening / closing and flow direction adjustment. In case of abnormal conditions such as power outage, control signal loss, or equipment failure, the built-in spring reset structure automatically switches the valve core to the fully open air circuit state, prioritizing gas medium flow and preventing equipment damage or process disruption caused by medium blockage. The FO-function two-position three-way solenoid valve 21 offers advantages such as rapid switching and sensitive response, effectively reducing unplanned downtime losses.

[0035] In the redundant anti-failure component 2 of the technical solution provided in this application, two FO-function two-position three-way solenoid valves 21 are connected in parallel to form a reliable redundancy protection mechanism. Under normal operating conditions, the two solenoid valves are synchronously energized and conduct, working together to achieve precise control of the air circuit; when either solenoid valve experiences a fault such as valve core jamming or power loss, the other solenoid valve can still respond normally to the fault signal and complete the pressure relief and air circuit conduction operation, solving the failure-to-operate problem caused by a single solenoid valve failure in the prior art, and significantly improving the operational reliability of the actuator.

[0036] Meanwhile, the redundant anti-failure component 2 of the technical solution provided in this application embodiment does not contain the positioner structure found in traditional pneumatic actuators. It directly achieves airflow control via the FO function two-position three-way solenoid valve 21, effectively simplifying the overall structure, reducing manufacturing costs and maintenance difficulty, and minimizing potential failure points. This not only meets the safety protection requirements of the FO function but also further mitigates the risk of failure through redundant design, completely resolving the core defects of existing technologies and ensuring stable equipment operation.

[0037] To further optimize the technical solution and prevent misjudgment of faults, and to further improve the stability and reliability of the pneumatic actuator, the pneumatic actuator provided in this application embodiment also includes: a misoperation protection component 3, which is connected to the outlet end of the FO function two-position three-way solenoid valve 21. In the technical solution provided in this application embodiment, the misoperation protection component 3 can effectively compensate for the inadequacy of relying solely on the FO function two-position three-way solenoid valve 21 to avoid the risk of misoperation. By real-time monitoring of the air path parameters at the outlet end of the FO function two-position three-way solenoid valve 21, such as gas pressure, flow rate, and conduction status, the action signal of the solenoid valve is verified a second time. This avoids the actuator from misjudging a fault state and triggering a full-open FO action due to non-substantial faults such as instantaneous voltage fluctuations, electromagnetic interference, signal mistransmission, or instantaneous valve core jamming.

[0038] When the two-position three-way solenoid valve 21 of the FO function experiences a momentary abnormal signal, the maloperation protection component 3 can quickly identify and filter such invalid signals (momentary abnormal signals), ensuring that the FO safety action is only triggered when a real fault occurs, effectively avoiding process disruptions, equipment misoperation, and unplanned shutdowns caused by maloperation. At the same time, the maloperation protection component 3 works in conjunction with the redundant anti-failure component 2. The redundant component solves the failure to operate problem, while the maloperation protection component 3 solves the maloperation problem. The two form a dual protection mechanism, further optimizing the safety performance of the actuator, so that the entire pneumatic actuator has both high reliability and high precision, and comprehensively improving the stability of equipment operation.

[0039] Please refer to this section for further information. Figure 2To ensure the malfunction protection component 3 effectively prevents malfunctions, and to accommodate the design requirement of easy installation and use, the malfunction protection component 3 provided in this application includes an adjustable flow valve 31, which is installed at the outlet end of the FO function two-position three-way solenoid valve 21. The adjustable flow valve 31 regulates the airflow and pressure, filtering out instantaneous abnormal signals and effectively preventing malfunctions, thus fully ensuring the stability and reliability of the malfunction protection component 3. Furthermore, the adjustable flow valve 31 has a simple structure and compact size, requiring no complex mounting brackets or additional adapter components. It can directly connect to the outlet interface of the solenoid valve, simplifying the installation process without requiring modification of the existing structure, and better adapting to the existing actuator's airflow layout.

[0040] In practical applications, to ensure that transient abnormal signals can be effectively filtered without affecting the transmission of normal fault signals and to guarantee the accuracy of the false trip protection function, operators can flexibly adjust the size of the throttling orifice according to the actual working conditions. The throttling orifice adjustment range of the adjustable flow valve 31 can be set to 0.1-0.5mm to precisely control the air flow and pressure, so as to adapt to the false trip protection sensitivity requirements of different scenarios. For two parallel-connected two-position three-way solenoid valves 21 with FO function, when a single solenoid valve is de-energized, its exhaust volume is ≤0.05m³ / min, which is low enough to drive the pneumatic actuator to operate. This effectively avoids the actuator from mistakenly triggering the FO fully open action due to excessive exhaust volume when a single solenoid valve fails, thus strengthening the protection against false activation. When both solenoid valves are de-energized, the total exhaust volume is ≥0.1m³ / min. This exhaust volume can meet the needs of the actuator for rapid pressure relief and automatic switching to the FO fully open state, ensuring that safety protection actions can be triggered in a timely manner when a real fault occurs, guaranteeing the flow of media, and achieving precise matching between false activation protection and fault safety protection.

[0041] To prevent valve core jamming and malfunction due to contamination of the gas entering the pneumatic actuator, an embodiment of this application provides a pneumatic actuator that further includes an air source treatment component 4. The air source treatment component is located in front of the air inlet of the air inlet component 1 and is used to purify or drain the gas entering the pneumatic actuator. The air source treatment component 4 can remove impurities and moisture from the gas, preventing impurities from clogging the air passage or moisture from corroding components, ensuring smooth airflow, and improving the stability and service life of the actuator. To further optimize the technical solution, the gas source processing component 4 provided in this application embodiment includes a filter section and a drainage section, which are connected in series. The filter section and drainage section are connected in series to collaboratively purify and drain the gas. The filter section effectively intercepts solid impurities, oil, and other pollutants in the gas, while the drainage section promptly discharges condensed moisture from the gas, ensuring proper filtration and drainage. This effectively prevents impurities from clogging the gas path, moisture from corroding the valve core and pipeline components, and avoids problems such as malfunction or jamming caused by gas contamination, ensuring smooth gas flow.

[0042] To further optimize the technical solution, the technical solution provided in this application embodiment includes a filtration section comprising a first filter, a second filter, and a third filter. The first filter, the second filter, and the third filter are arranged sequentially along the air inlet of the filtration section. The first filter includes an impurity filter element, the second filter includes an oil filter element, and the third filter includes a moisture filter element. In the technical solution provided in this application embodiment, the filtration section of the gas source treatment component 4 adopts a three-stage filtration structure, consisting of a first filter, a second filter, and a third filter arranged sequentially along the air inlet direction, forming a stepped purification system of impurities, oil, and moisture. The first filter's impurity filter element efficiently intercepts solid particles, dust, and other impurities in the gas, preventing impurities from entering the gas path and causing pipe blockage or valve core jamming. It also prevents impurities from wearing down actuator components, extending equipment lifespan. The second filter's oil filter element accurately filters oil and oil mist in the gas, preventing oil from adhering to the gas path pipes and solenoid valve core, preventing valve core jamming and gas path blockage, and ensuring smooth gas flow. The third filter's moisture filter element quickly separates condensed moisture in the gas, preventing moisture from entering subsequent gas paths, preventing moisture from corroding pipes and damaging solenoid valves, and preventing moisture from affecting gas path control accuracy. Through this three-stage series filtration design, comprehensive purification of impurities, oil, and moisture is achieved, effectively improving the purity of the gas entering the actuator, reducing equipment failures caused by gas impurities, and lowering maintenance costs.

[0043] In practical applications, the filtration diameters of the first filter, the second filter, and the third filter can be set to 5μm, 1μm, and 0.1μm, respectively. Technicians can adjust the filtration diameters according to the actual gas source, which does not constitute a limitation on the scope of protection of this application.

[0044] To facilitate the regulation of the gas flow rate entering the pneumatic actuator and ensure stable intake air pressure, the pneumatic actuator provided in this embodiment includes an intake component 1 comprising a pressure regulating valve and an airflow regulating valve. The airflow entering the intake component 1 passes sequentially through the airflow regulating valve and the pressure regulating valve. The airflow regulating valve can initially regulate the incoming gas flow rate, allowing operators to flexibly adjust the flow rate according to actual working conditions to better adapt to the gas supply requirements under different loads, avoiding abnormal actuator operation caused by excessive or insufficient flow rate. The pressure regulating valve further stabilizes the regulated airflow, precisely controlling the output air pressure to maintain stability, preventing malfunction of the FO function two-position three-way solenoid valve 21 and deviation of the malfunction protection component 3 due to fluctuations in air source pressure, while also preventing actuator jamming and delayed response caused by unstable air pressure.

[0045] To further optimize the technical solution and enable real-time monitoring of air pressure changes in the pneumatic actuator, this application embodiment provides a pneumatic actuator that further includes a pressure monitoring component 5. The pressure monitoring component 5 is located at the outlet of the redundant anti-misoperation component 2 or the inlet of the air source processing component 4. The pressure monitoring component 5 can capture abnormal pressure conditions in the air path in real time, promptly detecting abnormal operating conditions such as excessively high or low pressure caused by pipeline blockage, solenoid valve malfunction, or air source fluctuations. Simultaneously, it can also assist in determining the fault type based on pressure data, distinguishing between different fault types such as air source problems, solenoid valve malfunction, or pipeline blockage, reducing troubleshooting time. When pressure is abnormal, an early warning can be triggered promptly to avoid misjudgment of faults and prevent malfunction of the pneumatic actuator.

[0046] To further optimize the technical solution, the pneumatic actuator provided in this application embodiment also includes an emergency maintenance component 6. The emergency maintenance component 6 is respectively disposed at the inlet and outlet of the FO function two-position three-way solenoid valve 21, and is used to manually disconnect the FO function two-position three-way solenoid valve 21 from the airflow passage. The emergency maintenance component 6 can manually disconnect the solenoid valve from the airflow passage, providing safe and convenient operating conditions for online inspection and replacement when the solenoid valve is abnormal.

[0047] When the two-position three-way solenoid valve 21 of the FO function experiences abnormal conditions such as valve core jamming, seal leakage, or solenoid failure, the operator can quickly disconnect the air inlet and outlet passages of the corresponding solenoid valve by manually operating the emergency maintenance component 6. This ensures that the faulty solenoid valve is completely isolated from the entire pneumatic system without stopping the operation of the entire pneumatic actuator, enabling online inspection, repair, or replacement of the faulty solenoid valve. This solves the problem of traditional actuators requiring machine shutdown and air cutoff when replacing a faulty solenoid valve, which leads to production interruption and increased unplanned downtime losses, significantly improving maintenance efficiency and ensuring production continuity.

[0048] To balance the effective isolation of the emergency maintenance component 6 with ease of operation, the technical solution provided in this application embodiment includes a handwheel. The handwheel is simple and convenient to operate. When the FO function two-position three-way solenoid valve 21 experiences abnormalities such as valve core jamming, seal leakage, or electromagnetic malfunction, the air circuit can be quickly isolated by turning the handwheel, isolating the faulty solenoid valve from the entire air circuit system. This allows for online inspection, repair, or replacement of the faulty solenoid valve without machine shutdown, avoiding production interruptions caused by downtime maintenance and reducing unplanned downtime losses.

[0049] Please refer to this section for further information. Figure 3 Based on the description of the pneumatic actuator provided in the above embodiments of this application, the different operating conditions of the pneumatic actuator will be briefly explained.

[0050] Under normal operating conditions, the air source is filtered and stabilized in three stages, and then enters the actuator air chamber through a parallel air path of dual solenoid valves. The valves maintain their current state, and the pressure monitoring component collects parameters such as air source pressure and solenoid valve status in real time.

[0051] In the case of a single point of failure, if a single solenoid valve loses power or malfunctions, the adjustable flow valve of the malfunction protection component will limit the exhaust volume (≤0.05m³ / min). At this time, the valve of the FO function two-position three-way solenoid valve will remain stable, and the pneumatic actuator can issue a corresponding warning signal.

[0052] In the case of a dual-fault operation, both parallel FO function two-position three-way solenoid valves lose power, the air source pressure is less than 0.6MPa, the total exhaust volume is ≥0.1m³ / min, and the FO function two-position three-way solenoid valves lock the air path.

[0053] During emergency maintenance, the valve is manually opened using a handwheel. Maintenance personnel replace the faulty component according to the actual fault condition, and the pneumatic actuator is reset after the replacement is completed.

[0054] The pneumatic actuator provided in this application has the following advantages: First, it effectively solves the problem of FO function failure caused by single point of failure in existing technologies, and improves redundancy reliability; Second, it addresses the issue of valve malfunction caused by unexpected power loss in a single solenoid valve, ensuring operational stability. Third, it effectively simplifies the system structure, eliminates unnecessary positioner structures, and reduces failure points and maintenance costs; Fourth, it enables real-time monitoring and fault early warning of the operating status of the actuators, reducing the risk of unplanned downtime; Fifth, optimize emergency operation performance and improve the efficiency of fault replacement.

[0055] In summary, this application provides a pneumatic actuator, including: an air inlet assembly and a redundant anti-misoperation assembly, wherein the air outlet of the air inlet assembly is connected to the redundant anti-misoperation assembly; the redundant anti-misoperation assembly includes: two parallel FO-function two-position three-way solenoid valves, the air inlet of which is connected to the air outlet of the air inlet assembly. The pneumatic actuator provided in this application, through the parallel design of two FO-function two-position three-way solenoid valves, effectively avoids the problem of misoperation caused by a single point of failure, ensuring operational stability. Simultaneously, it eliminates the need for a positioner, effectively simplifying the structure and reducing failure points and maintenance costs; it solves the technical defects of existing pneumatic actuators, such as the risk of misoperation and high system complexity.

[0056] The technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. Furthermore, other implementation methods can be derived from the above embodiments, allowing for structural and logical substitutions and changes without departing from the scope of this disclosure.

[0057] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A pneumatic actuator, characterized in that, The pneumatic actuator includes an air intake assembly and a redundant anti-rejection assembly, wherein the air outlet of the air intake assembly is connected to the redundant anti-rejection assembly. The redundant anti-rejection assembly includes two parallel FO-function two-position three-way solenoid valves, the air inlet of which is connected to the air outlet of the air inlet assembly.

2. The pneumatic actuator according to claim 1, characterized in that, The pneumatic actuator further includes a malfunction protection component, which is connected to the outlet end of the FO function two-position three-way solenoid valve.

3. The pneumatic actuator according to claim 2, characterized in that, The malfunction protection component includes an adjustable flow valve, which is installed at the outlet end of the FO function two-position three-way solenoid valve.

4. The pneumatic actuator according to claim 1 or 2, characterized in that, The pneumatic actuator further includes an air source processing component, which is located in front of the air inlet of the air inlet component and is used to purify or drain the gas entering the pneumatic actuator.

5. The pneumatic actuator according to claim 3, characterized in that, The gas source processing component includes a filter section and a drainage section, wherein the filter section and the drainage section are connected in series.

6. The pneumatic actuator according to claim 5, characterized in that, The filtration unit includes a first filter, a second filter, and a third filter, which are arranged sequentially along the air inlet of the filtration unit. The first filter includes an impurity filter element, the second filter includes an oil filter element, and the third filter includes a moisture filter element.

7. The pneumatic actuator according to claim 1, characterized in that, The intake assembly includes a pressure regulating valve and an airflow regulating valve, and the airflow entering the intake assembly passes through the airflow regulating valve and the pressure regulating valve in sequence.

8. The pneumatic actuator according to claim 4, characterized in that, The pneumatic actuator further includes a pressure monitoring component, which is disposed at the outlet end of the redundant anti-rejection component or the inlet end of the air source processing component.

9. The pneumatic actuator according to claim 1, characterized in that, The pneumatic actuator further includes an emergency maintenance component, which is respectively installed at the inlet and outlet of the FO function two-position three-way solenoid valve, and is used to manually disconnect the FO function two-position three-way solenoid valve from the airflow passage.

10. The pneumatic actuator according to claim 9, characterized in that, The emergency maintenance components include: a handwheel.

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