A pneumatic actuator control system

Abstract

The application provides a pneumatic actuator control system, which comprises a control panel, a gas source manual valve, a filter pressure reducer, a split positioner, a flow regulating device, a quick opening device, a quick closing device, a holding device, a split position sensor and a junction box, which are all arranged on the control panel. The split positioner, the split position sensor and other control elements such as two-position three-way electromagnetic valves are arranged away from high temperature and vibration working conditions, so that the service life of each control element is greatly prolonged. The flow regulating device, the quick opening device, the quick closing device and the holding device are integrated, and different functional modules can be selected according to different specifications of the pneumatic actuator, so as to meet different functional requirements. The pneumatic actuator control system can be applied to the control of a pneumatic circuit under severe working conditions such as quick positioning and adjustment of a pneumatic actuator, independent switch control and the like, for example, the control of a valve pneumatic actuator under complex working conditions such as a turbine bypass valve and a compressor anti-surge valve.

Description

Technical Field

[0001] This invention relates to the field of electrical control technology, and in particular to a control system for a pneumatic actuator. Background Technology

[0002] In factories, pneumatic actuators, operating under harsh conditions, are prone to significant and frequent vibrations due to the high pressure and temperature of the medium within the pipelines, resulting in high radiant temperatures. High radiant temperatures can easily cause aging or loosening of control accessories and air supply lines on the pneumatic actuator. Significant vibration of the actuator itself can cause vibration of pipeline valves, which in turn causes the control accessories on the actuator to vibrate, increasing the likelihood of unstable component control and air leaks at pipeline joints. This can lead to malfunctions or complete failure of the actuator.

[0003] In addition, many electronic pneumatic actuators and pneumatic control components used in high-temperature areas have poor high-temperature resistance, which can lead to equipment malfunctions or failures to operate. This reduces the reliability and lifespan of the control device and poses a certain risk to the stable operation of the factory process. Summary of the Invention

[0004] This invention provides a control system for a pneumatic actuator to solve the problems of low reliability and short lifespan of the control elements of a pneumatic actuator.

[0005] This invention provides a pneumatic actuator control system, including a control panel and, all mounted on the control panel, a manual air source valve, a filter regulator, a split positioner, a flow regulating device, a quick-opening device, a quick-closing device, a position holding device, a split position sensor, and a junction box; wherein,

[0006] The manual gas source valve is connected to the filter pressure regulator;

[0007] The filter pressure reducer is connected to a multi-port connector via a connector pipe; and the multi-port connector is respectively connected to the split positioner, the flow regulating device, the quick-opening device, the quick-closing device, and the position holding device;

[0008] The flow regulating device, the quick-opening device, the quick-closing device, and the position-holding device are connected in sequence via O-rings. The position-holding device is also connected to the gas source output interface via an O-ring.

[0009] The air source output interface is connected to the pneumatic actuator; the split position sensor is connected to the junction box via a cable.

[0010] Preferably, the flow regulating device includes two flow amplifiers arranged in parallel, and the two flow amplifiers are respectively connected to the split positioner.

[0011] Preferably, the quick-opening device includes a quick-opening two-position three-way solenoid valve, a first quick-opening pneumatic three-way valve, and a second quick-opening pneumatic three-way valve, wherein the first quick-opening pneumatic three-way valve and the second quick-opening pneumatic three-way valve are connected together; the quick-opening two-position three-way solenoid valve is connected to the multi-port seat and the first quick-opening pneumatic three-way valve respectively, and the second quick-opening pneumatic three-way valve is connected to the multi-port seat.

[0012] Preferably, the quick-closing device includes a quick-closing two-position three-way solenoid valve, a first quick-closing pneumatic three-way valve, and a second quick-closing pneumatic three-way valve, wherein the first quick-closing pneumatic three-way valve and the second quick-closing pneumatic three-way valve are connected together; the quick-closing two-position three-way solenoid valve is respectively connected to the quick-opening two-position three-way solenoid valve and the first quick-closing pneumatic three-way valve in the quick-opening device, and the first quick-closing pneumatic three-way valve is also connected to the second quick-opening pneumatic three-way valve in the quick-opening device.

[0013] Preferably, the position-holding device includes a position-holding two-position three-way solenoid valve, a first airlock valve, and a second airlock valve, wherein the first airlock valve and the second airlock valve are connected in series; the position-holding two-position three-way solenoid valve is connected to the quick-closing two-position three-way solenoid valve in the quick-closing device.

[0014] Preferably, a conversion connection block is provided between the position holding device and the gas source output interface, and a bypass valve is provided on the conversion connection block, the bypass valve being connected to both ends of the gas source output interface respectively.

[0015] The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

[0016] This invention provides a pneumatic actuator control system, including a control panel and several components mounted on the control panel, including a manual air source valve, a filter regulator, a split positioner, a flow regulating device, a quick-opening device, a quick-closing device, a position holding device, a split position sensor, and a junction box. The manual air source valve and the filter regulator are connected. The filter regulator is connected to a multi-way connector via a connector pipe. The multi-way connector is connected to the split positioner, the flow regulating device, the quick-opening device, the quick-closing device, and the position holding device. The flow regulating device, the quick-opening device, the quick-closing device, and the position holding device are sequentially connected via O-ring connections. The position holding device is also connected to an air source output interface via an O-ring connection. The air source output interface is connected to the pneumatic actuator. The split position sensor is connected to the junction box via a cable. In the pneumatic actuator control system provided by this application, the split positioner, split position sensor, two-position three-way solenoid valve, and other control components are located away from high temperatures and vibration conditions, thereby enhancing component reliability and significantly extending the service life of each control component. Furthermore, the integrated functional modules, such as flow regulation devices, quick-opening devices, quick-closing devices, and position-holding devices, allow for the selection of different functional modules for pneumatic actuators of different specifications to meet diverse functional requirements. The pneumatic actuator control system provided in this application can be applied to pneumatic circuit control in demanding operating conditions requiring rapid positioning and adjustment of the pneumatic actuator, as well as independent rapid switching control. Examples include valve pneumatic actuator control in complex operating conditions such as turbine bypass valves, compressor anti-surge valves, and desuperheating and pressure-reducing devices.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A three-dimensional structural schematic diagram of the pneumatic actuator control system provided in an embodiment of the present invention;

[0020] Figure 2 This is a front view of the pneumatic actuator control system provided in an embodiment of the present invention;

[0021] Figure 3 Provided for embodiments of the present invention Figure 2 Enlarged structural diagram at point A;

[0022] Figure 4This is a schematic diagram of the O-ring mounting form provided in an embodiment of the present invention;

[0023] Symbolic representation:

[0024] 1-Control panel, 2-Manual air source valve, 3-Filter regulator, 4-Split positioner, 5-Flow regulating device, 6-Quick opening device, 7-Quick closing device, 8-Position holding device, 9-Split position sensor, 10-Junction box, 11-Connector pipe, 12-Multi-port socket, 13-Air source output interface, 14-Pneumatic actuator, 15-Conversion connection block, 16-Bypass valve, 17-First pipe, 18-Second pipe, 19-Third pipe, 20-Fourth pipe, 21-Fifth pipe, 22-Sixth pipe, 23-Seventh pipe, 24-Eighth pipe, 25-Ninth pipe, 26-Tenth pipe, 27-Metal hose; 501-Flow amplifier;

[0025] 601-Quick-opening two-position three-way solenoid valve; 602-First quick-opening pneumatic three-way valve; 603-Second quick-opening pneumatic three-way valve.

[0026] 701-Quick-closing two-position three-way solenoid valve; 702-First quick-closing pneumatic three-way valve; 703-Second quick-closing pneumatic three-way valve.

[0027] 801 - Two-position three-way solenoid valve with position retention; 802 - First air lock valve; 803 - Second air lock valve. Detailed Implementation

[0028] Please refer to the attached document. Figure 1 , 2 Among them, attached Figure 1 , 2 The accompanying drawings show a three-dimensional structural schematic diagram and a front view of the pneumatic actuator control system provided in the embodiments of this application. Figure 1 , 2 As can be seen, the pneumatic actuator control system provided in this application embodiment includes a control panel 1 and a manual air source valve 2, a filter pressure reducer 3, a split positioner 4, a flow regulating device 5, a quick-opening device 6, a quick-closing device 7, a position holding device 8, a split position sensor 9, and a junction box 10, all of which are installed on the control panel 1.

[0029] Specifically, control panel 1 is the framework structure of the pneumatic actuator control system, used to fix and mount control elements. Pneumatic actuator 14 is the actuator, capable of receiving control from the control system, performing adjustment, positioning, and switching actions, thereby driving the valve to complete corresponding actions. Air source manual valve 2 is the working air source inlet switch, providing working air to the entire pneumatic actuator control system. Filter pressure reducer 3 is a component for filtering, purifying, and adjusting the pressure of the input working air source; thus, filter pressure reducer 3 and air source manual valve 2 are connected via a threaded connector. In this embodiment, filter pressure reducer 3 can filter water and impurities from compressed air, while setting the operating pressure of downstream pneumatic elements to 5 kg. Filter pressure reducer 3 is connected to multi-port connector 12 via connector pipe 11. Multi-port connector 12 is connected to split positioner 4, flow regulating device 5, quick-opening device 6, quick-closing device 7, and position holding device 8 respectively, to provide air source to split positioner 4, etc.

[0030] The split positioner 4 is a regulating control element of the pneumatic actuator control system, and it is directly connected to the multi-port 12 via the first pipeline 17. The split positioner 4 can receive control signals from the DCS (Distributed Control System) and convert them into control air source signals, which in turn control the flow regulating device 5 to regulate the flow rate. Therefore, the split positioner 4 is connected to the flow regulating device 5.

[0031] The flow regulating device 5 is a component that regulates the flow of the working air source supplied from the multi-port 12, and it is directly connected to the multi-port 12. In this embodiment, the flow regulating device 5 includes two flow amplifiers 501 arranged in parallel, and the two flow amplifiers 501 are respectively connected to the split positioner 4 through the second pipeline 18 and the third pipeline 19.

[0032] Quick-opening device 6 and quick-closing device 7 are devices for controlling the rapid opening and closing of the pneumatic actuator 14. (See attached...) Figure 3 As shown in the embodiment of this application, the quick-opening device 6 includes a quick-opening two-position three-way solenoid valve 601, a first quick-opening pneumatic three-way valve 602, and a second quick-opening pneumatic three-way valve 603. The quick-opening two-position three-way solenoid valve 601 is connected to the first quick-opening pneumatic three-way valve 602, and the first quick-opening pneumatic three-way valve 602 and the second quick-opening pneumatic three-way valve 603 are connected via a fourth pipe 20. The quick-opening two-position three-way solenoid valve 601 is connected to a multi-port seat 12 via a fifth pipe 21. Simultaneously, the second quick-opening pneumatic three-way valve 603 is connected to the multi-port seat 12 via a sixth pipe 22.

[0033] The quick-closing device 7 includes a quick-closing two-position three-way solenoid valve 701, a first quick-closing pneumatic three-way valve 702, and a second quick-closing pneumatic three-way valve 703. The quick-closing two-position three-way solenoid valve 701 is connected to the first quick-closing pneumatic three-way valve 702, and the first quick-closing pneumatic three-way valve 702 and the second quick-closing pneumatic three-way valve 703 are connected via a seventh pipe 23. The quick-closing two-position three-way solenoid valve 701 is also connected to the quick-opening two-position three-way solenoid valve 601 in the quick-opening device 6 via an eighth pipe 24. The first quick-closing pneumatic three-way valve 702 is connected to the second quick-opening pneumatic three-way valve 603 in the quick-opening device 6 via a ninth pipe 25.

[0034] The position-holding device 8 includes a position-holding two-position three-way solenoid valve 801, a first airlock valve 802, and a second airlock valve 803, wherein the first airlock valve 802 and the second airlock valve 803 are connected together. The position-holding two-position three-way solenoid valve 801 is connected to the quick-closing two-position three-way solenoid valve 701 in the quick-closing device 7 through the tenth pipeline 26. The multi-port seat 12 is connected to the quick-opening two-position three-way solenoid valve 601 via the fifth pipe 21, the quick-opening two-position three-way solenoid valve 601 is connected to the quick-closing two-position three-way solenoid valve 701 via the eighth pipe 24, and the quick-closing two-position three-way solenoid valve 701 is connected to the position-holding two-position three-way solenoid valve 801 via the tenth pipe 26. Thus, the multi-port seat 12, the quick-opening two-position three-way solenoid valve 601, the quick-closing two-position three-way solenoid valve 701 and the position-holding two-position three-way solenoid valve 801 are interconnected, and thus serve as the first-come control air source to control the air path operation switching of the quick-opening device 6, the quick-closing device 7 and the position-holding device 8.

[0035] Furthermore, the flow regulating device 5, quick-opening device 6, quick-closing device 7, and position-holding device 8 are connected sequentially via O-ring connectors. The position-holding device 8 is also connected to the air source output interface 13 via an O-ring connector, as shown in the attached diagram. Figure 4 As shown, the larger oval section in the middle is designed as a groove, with an O-ring placed inside. It is then secured to another component with a flat surface using four fixing bolts. This O-ring-attached connection method not only significantly reduces the use of threaded seals, minimizing leaks and improving equipment reliability and maintenance, but also facilitates disassembly and assembly.

[0036] The split position sensor 9 detects the position signal of the pneumatic actuator 14 and transmits the detected position signal to the split positioner 4. The junction box 10 is the component for wiring the various electrical components on the control panel 1; it has internal terminals for connecting control cables. For example, the junction box 10 is connected to the split position sensor 9 via a connecting cable. The air source output interface 13 is the interface for outputting the air source from the pneumatic actuator control system; it is directly connected to the pneumatic actuator 14 via a flexible metal hose 27.

[0037] A conversion connector 15 is provided between the position holding device 8 and the air source output interface 13. This conversion connector 15 has a bypass valve 16. The conversion connector 15 can convert the O-ring connection of the position holding device 8 into a threaded connection, and simultaneously integrates and fixes the quick-opening device 6, quick-closing device 7, and position holding device 8 onto the control panel 1. The bypass valve 16 is a component for adjusting the air pressure balance of the pneumatic actuator 14, and it connects the two ends of the air source output interface 13. After opening the bypass valve 16, the front and rear chambers of the piston of the pneumatic actuator 14 are connected, allowing manual operation of the handwheel mechanism, but automatic control is not possible.

[0038] The working principle of the pneumatic actuator control system provided in this application embodiment is as follows:

[0039] Open the manual air supply valve 12, and compressed air at a pressure of 6-7 kg enters the filter regulator 3. The filter regulator 3 filters and reduces the pressure of the compressed air until it reaches a pressure of 5 kg. The filtered and reduced compressed air is then delivered to the multi-port seat 12 via the connector pipe 11. A portion of the compressed air directly enters the flow regulating device 5. At this time, the quick-opening device 6, quick-closing device 7, and position-holding device 8 are all inactive. After the flow regulating device 5 adjusts the flow rate, the compressed air enters the quick-opening device 6, which in turn switches the quick-opening device 6, quick-closing device 7, and position-holding device 8 to the ventilation state. The other portion of the compressed air enters the split positioner 4 via the first pipe 17. At this time, the working air supply between the flow regulating device 5, quick-opening device 6, quick-closing device 7, position-holding device 8, air supply output interface 13, and pneumatic actuator 14 is connected, allowing for the regulation and control of the pneumatic actuator 14.

[0040] The adjustment of the pneumatic actuator 14 specifically includes: the split positioner 4 receiving the control signal given by the DCS. Simultaneously, the split position sensor 9 collects the real-time displacement parameters of the pneumatic actuator 14 and sends these parameters to the split positioner 4. The split positioner 4 compares the received control signal from the DCS with the real-time displacement parameters sent by the split position sensor 9 to determine the position difference. Based on the position difference, the split positioner 4 sends an air source control signal to the flow regulating device 5, causing the flow regulating device 5 to adjust the flow rate through inflation or deflation, thereby controlling the pneumatic actuator 14 to perform corresponding actions and complete the adjustment control.

[0041] When the working air source between the flow regulating device 5 and the pneumatic actuator 14 is connected, the multi-port seat 12, the quick-opening two-position three-way solenoid valve 601, and the quick-closing two-position three-way solenoid valve 701 are interconnected, and therefore the quick-opening two-position three-way solenoid valve 601 and the quick-closing two-position three-way solenoid valve 701 are also connected and activated, i.e., the quick-opening device 6 and the quick-closing device 7 are activated. At this time, the pneumatic actuator control system provided in this embodiment controls the pneumatic actuator 14 to perform rapid opening and closing actions. When the working air source is lower than the set point, it is generally considered that the working air source pressure is less than 2.5 bar, the position holding device 8 is activated. After activation, the position holding device 8 blocks the air passage of the air source output interface 13, so that compressed air cannot enter the pneumatic actuator 14 through the position holding device 8, and the air in the pneumatic actuator 14 cannot be discharged. At this time, the pneumatic actuator control system provided in this embodiment enters the fault position holding state, which protects the pneumatic actuator 14 and thus protects the currently controlled process equipment.

[0042] In the pneumatic actuator control system provided in this application embodiment, control components such as the split positioner 4, split position sensor 9, and two-position three-way solenoid valve are located away from high-temperature and vibration conditions, which enhances component reliability and significantly extends the service life of each control component. Furthermore, functional modules such as the flow regulating device 5, quick-opening device 6, quick-closing device 7, and position-holding device 8 are integrated, allowing for the selection of different functional modules for different specifications of pneumatic actuators to meet diverse functional requirements. The pneumatic actuator control system provided in this application embodiment can be applied to pneumatic circuit control in demanding conditions requiring rapid positioning and adjustment of the pneumatic actuator and independent switch control, such as valve pneumatic actuator control in complex conditions like turbine bypass valves, compressor anti-surge valves, and desuperheating and pressure reducing devices.

[0043] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0044] It should be understood that relational terms such as "first" and "second" are used merely 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. The invention is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A pneumatic actuator control system, characterized in that, Includes a control panel (1) and, on the control panel (1), a manual air valve (2), a filter regulator (3), a split positioner (4), a flow regulating device (5), a quick-opening device (6), a quick-closing device (7), a position holding device (8), a split position sensor (9), and a junction box (10); wherein, The gas source manual valve (2) and the filter pressure reducer (3) are connected; The filter pressure reducer (3) is connected to the multi-port seat (12) through the connector pipe (11); and the multi-port seat (12) is respectively connected to the split positioner (4), the flow regulating device (5), the quick-opening device (6), the quick-closing device (7) and the position holding device (8); The flow regulating device (5), the quick-opening device (6), the quick-closing device (7) and the position holding device (8) are connected in sequence through an O-ring. The position holding device (8) is also connected to the air source output interface (13) through an O-ring. The air source output interface (13) is connected to the pneumatic actuator (14); the split position sensor (9) is connected to the junction box (10) via a cable connection.

2. The pneumatic actuator control system according to claim 1, characterized in that, The flow regulating device (5) includes two flow amplifiers (501) arranged in parallel, and the two flow amplifiers (501) are respectively connected to the split positioner (4).

3. The pneumatic actuator control system according to claim 1, characterized in that, The quick-opening device (6) includes a quick-opening two-position three-way solenoid valve (601), a first quick-opening pneumatic three-way valve (602), and a second quick-opening pneumatic three-way valve (603), wherein the first quick-opening pneumatic three-way valve (602) and the second quick-opening pneumatic three-way valve (603) are connected together; the quick-opening two-position three-way solenoid valve (601) is connected to the multi-port seat (12) and the first quick-opening pneumatic three-way valve (602) respectively, and the second quick-opening pneumatic three-way valve (603) is connected to the multi-port seat (12).

4. The pneumatic actuator control system according to claim 1, characterized in that, The quick-closing device (7) includes a quick-closing two-position three-way solenoid valve (701), a first quick-closing pneumatic three-way valve (702), and a second quick-closing pneumatic three-way valve (703), and the first quick-closing pneumatic three-way valve (702) and the second quick-closing pneumatic three-way valve (703) are connected together; the quick-closing two-position three-way solenoid valve (701) is connected to the quick-opening two-position three-way solenoid valve (601) and the first quick-closing pneumatic three-way valve (702) in the quick-opening device (6), and the first quick-closing pneumatic three-way valve (702) is also connected to the second quick-opening pneumatic three-way valve (603) in the quick-opening device (6).

5. The pneumatic actuator control system according to claim 1, characterized in that, The position-holding device (8) includes a position-holding two-position three-way solenoid valve (801), a first airlock valve (802), and a second airlock valve (803), and the first airlock valve (802) and the second airlock valve (803) are connected together; the position-holding two-position three-way solenoid valve (801) is connected to the quick-closing two-position three-way solenoid valve (701) in the quick-closing device (7).

6. The pneumatic actuator control system according to claim 1, characterized in that, A conversion connection block (15) is provided between the position holding device (8) and the gas source output interface (13). A bypass valve (16) is provided on the conversion connection block (15), and the bypass valve (16) is connected to both ends of the gas source output interface (13).

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