Pneumatic valve control device based on gas storage tank and gas source amplifier

Abstract

The utility model discloses a pneumatic valve control device based on an air storage tank and an air source amplifier, and relates to the field of pneumatic valve control devices. A traditional pneumatic valve lacks an effective emergency gas supply guarantee mechanism, the valve cannot be closed rapidly, personnel safety and the production environment are greatly threatened, large resistance exists in the gas transmission and control process, and valve opening and closing response is slow. The pneumatic valve comprises an air filtering pressure reducing valve, an electric valve positioner, a first air source amplifier, a second air source amplifier, a pneumatic actuator, a limit switch, an air storage tank, an electromagnetic valve, a first pneumatic valve, a second pneumatic valve and a valve body. According to the device, the air inflow can be adjusted according to system requirements, stability and accuracy of valve action are guaranteed, quick response of the valve action is achieved, when a gas cut-off fault occurs, a standby gas source of the gas storage tank is automatically switched, the valve is driven to be quickly and accurately closed, and safety accidents possibly caused by out-of-control of the valve are effectively prevented.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic valve control devices, and in particular to a pneumatic valve control device based on an air storage tank and an air source amplifier. Background Technology

[0002] In the field of industrial automation, pneumatic valves, as key equipment for fluid control, are widely used in many industries such as petrochemicals, power energy, and food processing. However, traditional pneumatic valve control methods have significant technical bottlenecks. For example, in the event of sudden failures such as gas supply interruptions, the lack of an emergency gas supply guarantee mechanism prevents valves from closing quickly, potentially leading to pipeline leaks, equipment overpressure operation, or even serious accidents such as fires or explosions, threatening personnel safety and the production environment. On the other hand, in existing pneumatic systems, there is significant resistance to gas transmission and control, coupled with poor coordination between valve positioning and drive mechanisms, resulting in slow valve opening and closing responses, leading to low production efficiency and failing to meet the stringent requirements of modern industry for continuous and efficient production. Furthermore, traditional pneumatic valve control methods are also insufficient in the precise adjustment of valve opening, failing to achieve precise control of fluid flow, resulting in energy waste and product quality fluctuations. With the rapid development of industrial automation technology, there is an urgent need for a method that can effectively solve the above problems and achieve rapid response, precise control, and safe and reliable operation of pneumatic valves. Utility Model Content

[0003] The technical problem to be solved and the technical task proposed by this utility model is to improve and refine existing technical solutions, and to provide a pneumatic valve control device based on an air tank and an air source amplifier, so as to ensure the smooth and precise operation of the valve, achieve a fast and reliable response of the pneumatic valve, and be able to quickly and accurately close the pneumatic valve in the event of an air shortage. To this end, this utility model adopts the following technical solution.

[0004] A pneumatic valve control device based on an air tank and an air source amplifier includes an air filter pressure reducing valve, an electric valve positioner, a first air source amplifier, a second air source amplifier, a pneumatic actuator, a limit switch, an air tank, a solenoid valve, a first pneumatic valve, a second pneumatic valve, and a valve body.

[0005] The air filter pressure reducing valve has its input end connected to an external air source, and its output end connected in parallel to the air inlet of the electric valve positioner, the first air source amplifier, the second air source amplifier, and the solenoid valve.

[0006] The electric valve positioner has two output terminals, which are respectively connected to the control terminals of the first air source amplifier and the second air source amplifier.

[0007] The first interface of the air tank is connected to the pipeline between the external air source and the input end of the air filter pressure reducing valve. The output end of the first air source amplifier and the second interface of the air tank are connected to the extension port of the pneumatic actuator through the first pneumatic valve.

[0008] The output of the second air source amplifier is connected to the retraction port of the pneumatic actuator via the second pneumatic valve;

[0009] The outlet of the solenoid valve is connected to the control terminals of the first pneumatic valve and the second pneumatic valve via a control pipeline.

[0010] The drive shaft of the pneumatic actuator is connected to the valve body to control the opening and closing of the valve. A limit switch is provided between the pneumatic actuator and the valve body. The air source amplifier of this device can adjust the air intake according to system requirements, ensuring smooth, precise, and rapid valve operation. In the event of an air shortage, the solenoid valve switches the air path to the air tank. The high-pressure gas in the air tank quickly replenishes the extension port of the pneumatic actuator, driving the valve to close rapidly, effectively preventing potential safety accidents caused by valve malfunction.

[0011] As a preferred technical means: the first interface of the gas storage tank, the external gas source, and the input end of the air filter pressure reducing valve are connected by a first tee connector, and the first interface of the gas storage tank is provided with a one-way valve with the gas flow direction facing the first tee connector. In the case of unstable external gas source, the gas storage tank can provide supplementary gas through the one-way valve to achieve a more stable gas supply to the main gas path.

[0012] As a preferred technical approach: the output end of the air filter pressure reducing valve is sequentially connected in series with a second three-way connector, a third three-way connector, and a fourth three-way connector via a pipeline. The three ports of the second three-way connector are respectively connected to the output end of the air filter pressure reducing valve, the input end of the electric valve positioner, and the third three-way connector. The other two ports of the third three-way connector are respectively connected to the input end of the second air source amplifier and the fourth three-way connector. The other two ports of the fourth three-way connector are respectively connected to the air inlet end of the solenoid valve and the input end of the first air source amplifier. By connecting multiple three-way connectors in series to optimize the air path and layout of each component at the output end of the air filter pressure reducing valve, the air source can be distributed orderly and stably to components such as the electric valve positioner, the air source amplifier, and the solenoid valve. This reduces resistance and interference during gas transmission, ensuring a stable and sufficient air supply to each component, thereby improving the stability and efficiency of the pneumatic valve control device and guaranteeing the accuracy and reliability of valve control.

[0013] As a preferred technical approach: the control ports of the first and second pneumatic valves are arranged facing each other, and they are symmetrically connected by a fifth three-way connector. The other port of the fifth three-way connector is connected to the outlet of the solenoid valve through a control pipeline. This optimizes the control air path structure. The symmetrical layout with facing ports shortens the connection pipeline between the fifth three-way connector and the two pneumatic valves, resulting in a uniform air pressure distribution in the control air path. This ensures that the two pneumatic valves respond synchronously and stably to the control signals of the solenoid valve, enabling rapid and accurate switching of the air path. Consequently, it allows for more precise control of the pneumatic actuator's action, improving the valve's opening and closing response speed and control accuracy, and ensuring the stability of valve operation.

[0014] As a preferred technical means, the first and second pneumatic valves are two-position three-way pneumatic control valves. Their main air paths are respectively connected to the output terminals of the first and second air source amplifiers and the corresponding drive ports of the pneumatic actuators, controlling the switching of the control air path driven by the output air pressure of the solenoid valve. This allows for rapid response to the air pressure signal output by the solenoid valve, effectively realizing the driving and switching between the main air path and the control air path, accurately controlling the on / off state of the air path between the air source amplifier and the pneumatic actuator, and flexibly adjusting the direction and flow rate of the driving air pressure of the pneumatic actuator. This achieves precise control of the valve's opening and closing degree, meeting the valve's usage requirements under different operating conditions.

[0015] As a preferred technical means, the gas storage tank is equipped with an external gas supply line to maintain stable pressure in the tank through gas replenishment. This ensures that the pressure inside the gas storage tank is always maintained at a stable level, and the tank can always serve as a reliable emergency gas source. This avoids situations where insufficient pressure in the tank prevents the valve from closing during a gas outage, further enhancing the system's ability to cope with sudden gas outages and providing continuous and reliable safety assurance for industrial production.

[0016] As a preferred technical means, the air filter pressure reducing valve is equipped with a pressure sensor at its output end, and the signal line of the pressure sensor is connected to a solenoid valve. This allows for real-time monitoring of the main air circuit's pressure status. When the pressure falls below a set threshold, the pressure sensor promptly transmits a signal to the solenoid valve, triggering a gas shortage fault response mechanism. This causes the solenoid valve to quickly switch the air circuit, activating the air tank to supply air and close the valve. This real-time monitoring and rapid response mechanism significantly improves the system's ability to detect and handle gas shortage faults, ensuring the safety of system operation.

[0017] As a preferred technical means, the outlet of the gas storage tank is equipped with a safety pressure relief valve. The safety pressure relief valve automatically releases gas when the output pressure of the gas storage tank exceeds a threshold, preventing safety accidents caused by overpressure.

[0018] Beneficial effects: When the external gas source is unstable, the gas tank of this device can be supplemented with gas through a one-way valve to make the gas source more stable. The gas intake volume can be adjusted by the gas source amplifier to make the gas intake stable and reliable, ensuring the smooth and precise operation of the valve and realizing the rapid response of the valve. When a gas interruption failure occurs, the solenoid valve switches the gas path from the gas source amplifier to the gas tank. The high-pressure gas stored in the gas tank is quickly replenished to the extension port of the pneumatic actuator, driving the valve to close quickly and accurately, effectively preventing safety accidents that may be caused by valve malfunction. Attached Figure Description

[0019] Figure 1 This is a connection diagram of this utility model.

[0020] Figure 2 This is a schematic diagram showing the distribution of the five T-joints in this utility model.

[0021] In the diagram: 1. Air filter pressure reducing valve; 2. Electric valve positioner; 3. First air source amplifier; 4. Second air source amplifier; 5. Pneumatic actuator; 6. Limit switch; 7. Air tank; 8. Solenoid valve; 9. First pneumatic valve; 10. Second pneumatic valve; 11. Valve body; 12. External air source; 13. Check valve; 14. First three-way connector; 15. Second three-way connector; 16. Third three-way connector; 17. Fourth three-way connector; 18. Fifth three-way connector. Detailed Implementation

[0022] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings.

[0023] Example 1

[0024] like Figure 1 , 2As shown, a pneumatic valve control device based on an air tank and an air source amplifier includes an air filter pressure reducing valve 1, an electric valve positioner 2, a first air source amplifier 3, a second air source amplifier 4, a pneumatic actuator 5, a limit switch 6, an air tank 7, a solenoid valve 8, a first pneumatic valve 9, a second pneumatic valve 10, and a valve body 11. The input end of the air filter pressure reducing valve 1 is connected to an external air source 12, and its output end is connected in parallel to the air inlet ends of the electric valve positioner 2, the first air source amplifier 3, the second air source amplifier 4, and the solenoid valve 8, respectively. The electric valve positioner 2 has two output ends, which are connected in parallel to the first air source amplifier 3 and the second air source amplifier 4, respectively. The control terminal of the amplifier 4 is connected; the first interface of the air tank 7 is connected to the pipeline between the external air source 12 and the input terminal of the air filter pressure reducing valve 1; the output terminal of the first air source amplifier 3 and the second interface of the air tank 7 are connected to the extension port of the pneumatic actuator 5 through the first pneumatic valve 9; the output terminal of the second air source amplifier 4 is connected to the retraction port of the pneumatic actuator 5 through the second pneumatic valve 10; the outlet of the solenoid valve 8 is connected to the control terminals of the first pneumatic valve 9 and the second pneumatic valve 10 through the control pipeline; the drive shaft of the pneumatic actuator 5 is connected to the valve body 11 to control the opening and closing of the valve; a limit switch 6 is provided between the pneumatic actuator 5 and the valve body 11.

[0025] To ensure a more stable supply of gas to the main gas path, the first port of the gas storage tank 7, the external gas source 12, and the input terminal of the air filter pressure reducing valve 1 are connected by a first three-way connector 14. A one-way valve 13 is provided at the first port of the gas storage tank 7, with the gas flow direction facing the first three-way connector 14. In the event of an unstable external gas source 12, the gas storage tank 7 can provide supplementary gas supply through the one-way valve 13, thus achieving a more stable supply of gas to the main gas path.

[0026] To optimize the air path layout, the output of the air filter pressure reducing valve 1 is connected in series via a second three-way connector 15, a third three-way connector 16, and a fourth three-way connector 17. The three ports of the second three-way connector 15 are connected to the output of the air filter pressure reducing valve 1, the input of the electric valve positioner 2, and the third three-way connector 16, respectively. The other two ports of the third three-way connector 16 are connected to the input of the second air source amplifier 4 and the fourth three-way connector 17, respectively. The other two ports of the fourth three-way connector 17 are connected to the air inlet of the solenoid valve 8 and the input of the first air source amplifier 3, respectively. By connecting multiple three-way connectors in series to optimize the air path and layout of the various components at the output of the air filter pressure reducing valve 1, the air source can be distributed orderly and stably to components such as the electric valve positioner 2, the air source amplifier, and the solenoid valve 8. This reduces resistance and interference during gas transmission, ensuring a stable and sufficient air supply to each component, thereby improving the stability and efficiency of the pneumatic valve control device and guaranteeing the accuracy and reliability of valve control.

[0027] To accurately control the on / off state of the air path between the air source amplifier and the pneumatic actuator 5, the first pneumatic valve 9 and the second pneumatic valve 10 are two-position three-way pneumatic control valves. Their main air paths are respectively connected to the output terminals of the first air source amplifier 3 and the second air source amplifier 4 and the corresponding drive ports of the pneumatic actuator 5, and the control air path is switched by the output air pressure of the solenoid valve 8. This allows for rapid response to the air pressure signal output by the solenoid valve 8, effectively realizing the drive and switching between the main air path and the control air path, accurately controlling the on / off state of the air path between the air source amplifier and the pneumatic actuator 5, and flexibly adjusting the direction and flow rate of the drive air pressure of the pneumatic actuator 5, thereby achieving precise control of the valve's opening and closing and its degree of opening, meeting the valve's usage requirements under different operating conditions.

[0028] To ensure stable pressure within the gas storage tank 7, an external gas supply line is provided to maintain pressure stability through replenishment. This ensures that the pressure within the gas storage tank 7 remains at a stable level, allowing it to serve as a reliable emergency gas source at any time. This prevents situations where insufficient pressure in the gas storage tank 7 prevents the valve from closing during a gas outage, further enhancing the system's ability to respond to sudden gas outages and providing continuous and reliable safety assurance for industrial production.

[0029] To enable real-time monitoring of the main air pressure, an air filter pressure reducing valve 1 is equipped with a pressure sensor at its output. The signal line of the pressure sensor is connected to the solenoid valve 8. This allows for real-time monitoring of the main air pressure. When the pressure falls below a set threshold, the pressure sensor promptly transmits a signal to the solenoid valve 8, triggering a gas shortage fault response mechanism. This causes the solenoid valve 8 to quickly switch the air path, activating the air tank 7 to supply air and close the valve. This real-time monitoring and rapid response mechanism significantly enhances the system's ability to detect and handle gas shortage faults, ensuring the safety of system operation.

[0030] During valve control device installation, first install the air filter pressure reducing valve 1, connect it to the external air source 12, and set a suitable output pressure. Then install the air tank 7, connecting it to the first three-way connector 14 via a one-way valve 13. The one-way valve 13 ensures stable air supply to the air tank 7 when the pressure of the external air source 12 fluctuates, guaranteeing air source stability. In the signal control section, install the electric valve positioner 2 and fix it to the side of the pneumatic actuator 5, connecting it to a 4-20mA signal input, air source input, and output. Next, install the first air source amplifier 3 and the second air source amplifier 4 to enhance airflow control capability. The solenoid valve 8 is installed in the air supply path of the pneumatic actuator 5 and connected to the control signal. In the actuator section, securely connect the pneumatic actuator 5 to the valve body 11 and install a limit switch 6 to monitor the valve position. Simultaneously, arrange the first pneumatic valve 9 and the second pneumatic valve 10 to optimize airflow control. Piping connections use pressure-resistant air hoses, and quick couplings or sealing tape are used to ensure airtightness. After the equipment installation is completed, the air supply pressure is adjusted, the response of the electric valve positioner 2 is checked, the switching status of the solenoid valve 8 is tested, and the feedback signal of the limit switch 6 is verified. Finally, the entire device is connected to a DCS or PLC for joint debugging to ensure stable signal transmission, precise actuator action, optimize PID control parameters, and regularly check airtightness to ensure long-term stable operation of the system.

[0031] Before being connected to the air filter and pressure reducing valve 1, the external air source 12 undergoes preliminary filtration through a coarse filter. The air filter and pressure reducing valve 1 provides a clean and stable air source for the device. The electric valve positioner 2 is connected to the DCS control system, receiving 4-20mA control signals to precisely adjust the valve opening. In this embodiment, the first air source amplifier 3 and the second air source amplifier 4 are selected with a magnification factor of 3, enabling them to quickly respond to the signals from the electric valve positioner 2, increasing the flow rate and pressure of the control airflow, and allowing the pneumatic actuator 5 to drive the valve to quickly complete the fully open or fully closed action. During daily production, the valve adjusts its opening according to production needs, and the air source amplifiers stably adjust the air intake to ensure smooth, precise, and rapid valve operation. When a sudden gas supply interruption occurs, the pressure sensor at the output end of the air filter pressure reducing valve 1 immediately transmits a signal to the solenoid valve 8 when it detects that the gas pressure is lower than the threshold. The solenoid valve 8 quickly switches the gas path to connect the gas storage tank 7 and the extension port of the pneumatic actuator 5. The high-pressure gas in the gas storage tank 7 enters the extension port of the pneumatic actuator 5 through the first pneumatic valve 9, quickly closing the valve and effectively preventing raw material leakage, thus ensuring production safety.

[0032] This device can effectively stabilize the main air volume, ensure smooth and precise valve operation, and achieve rapid valve response. In the event of an air shortage, the high-pressure gas stored in the air tank 7 can be quickly replenished to the extension port of the pneumatic actuator 5 to drive the valve to close quickly and accurately, effectively preventing safety accidents that may be caused by valve malfunction.

[0033] Example 2

[0034] Unlike the previous embodiment, the control ports of the first pneumatic valve 9 and the second pneumatic valve 10 are arranged facing each other and symmetrically connected by a fifth three-way connector 18. The other port of the fifth three-way connector 18 is connected to the outlet of the solenoid valve 8 through a control pipeline. This optimizes the control air path structure. The symmetrical layout with the valves facing each other shortens the connection pipeline between the fifth three-way connector 18 and the two pneumatic valves, making the air pressure distribution in the control air path uniform. This ensures that the two pneumatic valves respond synchronously and stably to the control signal of the solenoid valve 8, achieving rapid and accurate switching of the air path. This, in turn, allows for more precise control of the pneumatic actuator 5, improving the response speed and control accuracy of valve opening and closing, and ensuring the stability of valve operation.

[0035] Example 3

[0036] Unlike embodiments one or two above, the outlet of the gas storage tank 7 is equipped with a safety relief valve. The safety relief valve automatically releases gas when the output pressure of the gas storage tank 7 exceeds a threshold, preventing damage to the pneumatic actuator 5 due to overpressure.

[0037] The pneumatic valve control device based on an air tank and an air source amplifier shown above is a specific embodiment of this utility model, which has demonstrated the substantial features and progress of this utility model. According to actual use needs, equivalent modifications in shape, structure, etc. can be made to it under the guidance of this utility model, all of which are within the protection scope of this solution.

Claims

1. A pneumatic valve control device based on an air storage tank and an air source amplifier, characterized in that: Includes an air filter pressure reducing valve, an electric valve positioner, a first air source amplifier, a second air source amplifier, a pneumatic actuator, a limit switch, an air tank, a solenoid valve, a first pneumatic valve, a second pneumatic valve, and a valve body; The air filter pressure reducing valve has its input end connected to an external air source, and its output end connected in parallel to the air inlet of the electric valve positioner, the first air source amplifier, the second air source amplifier, and the solenoid valve. The electric valve positioner has two output terminals, which are respectively connected to the control terminals of the first air source amplifier and the second air source amplifier. The first interface of the air tank is connected to the pipeline between the external air source and the input end of the air filter pressure reducing valve. The output end of the first air source amplifier and the second interface of the air tank are connected to the extension port of the pneumatic actuator through the first pneumatic valve. The output of the second air source amplifier is connected to the retraction port of the pneumatic actuator via the second pneumatic valve; The outlet of the solenoid valve is connected to the control terminals of the first pneumatic valve and the second pneumatic valve via a control pipeline. The drive shaft of the pneumatic actuator is connected to the valve body to control the opening and closing of the valve, and the limit switch is provided between the pneumatic actuator and the valve body.

2. The pneumatic valve control device based on a gas storage tank and a gas source amplifier according to claim 1, characterized in that: The first interface of the gas storage tank, the external gas source, and the input end of the air filter pressure reducing valve are connected by a first three-way connector. The first interface of the gas storage tank is provided with a one-way valve with the gas flow direction facing the first three-way connector.

3. The pneumatic valve control device based on an air storage tank and an air source amplifier according to claim 2, characterized in that: The output end of the air filter pressure reducing valve is connected in series via a pipeline to a second three-way connector, a third three-way connector, and a fourth three-way connector. The three ports of the second three-way connector are respectively connected to the output end of the air filter pressure reducing valve, the input end of the electric valve positioner, and the third three-way connector. The other two ports of the third three-way connector are respectively connected to the input end of the second air source amplifier and the fourth three-way connector. The other two ports of the fourth three-way connector are respectively connected to the air inlet end of the solenoid valve and the input end of the first air source amplifier.

4. A pneumatic valve control device based on a gas storage tank and a gas source amplifier according to claim 3, characterized in that: The control ports of the first pneumatic valve and the second pneumatic valve are arranged facing each other and are symmetrically connected by a fifth three-way connector. The other port of the fifth three-way connector is connected to the air outlet of the solenoid valve through a control pipeline.

5. A pneumatic valve control device based on an air storage tank and an air source amplifier according to claim 4, characterized in that: The first and second pneumatic valves are two-position three-way pneumatic control valves. Their main air paths are respectively connected to the output terminals of the first and second air source amplifiers and the corresponding drive ports of the pneumatic actuators, and the control air path is switched by the output air pressure of the solenoid valve.

6. A pneumatic valve control device based on a gas storage tank and a gas source amplifier according to claim 5, characterized in that: The gas storage tank is equipped with an external gas supply line to maintain the pressure stability of the gas storage tank by replenishing gas.

7. A pneumatic valve control device based on a gas storage tank and a gas source amplifier according to claim 6, characterized in that: The air filter pressure reducing valve is equipped with a pressure sensor at its output end, and the signal line of the pressure sensor is connected to the solenoid valve.

8. A pneumatic valve control device based on a gas storage tank and a gas source amplifier according to claim 7, characterized in that: The gas storage tank is equipped with a safety pressure relief valve at its outlet.

Images