Valve control device and method

Abstract

The invention provides a valve control device and method, a movable elastic membrane and an upper chamber and a lower chamber which are divided into sealed and isolated upper and lower chambers are arranged in an inner chamber of a driving mechanism, the elastic membrane is in transmission connection with a terminal valve, and a gas path system is provided with a filter, an electromagnetic valve, a positioner, a gas control valve and a position retaining valve. A first gas path, a second gas path, a third gas path and a fourth gas path are respectively constructed, the opening amplitude of the terminal valve can be remotely controlled through the positioner under the power-on gas supply working condition, the terminal valve can be automatically and emergently closed under the power-off working condition, and the original opening amplitude of the terminal valve can be maintained under the gas-off working condition. By means of the terminal valve self-adaptive opening and closing control method and device, self-adaptive opening and closing control of the terminal valve under the complex working condition is achieved, safe closing of the terminal valve can be achieved under the emergency condition, and troubleshooting is facilitated.

Description

Technical Field

[0001] The present invention belongs to the technical field of valves, and in particular relates to a valve control device and method. Background Art

[0002] In the field of industrial automation, gas circuit control design is one of the important means to achieve precise control and automated operation of valve devices. Therefore, it is widely used in production operations in manufacturing, chemical, energy and other industries. Through reasonable gas circuit design and effective control strategies, the flow direction, flow rate and pressure of the medium can be accurately controlled to ensure that the actuator works according to the predetermined requirements, and in an emergency, the action of the actuator is automatically stopped to improve the safety of the system. With the continuous development of the industrial control industry, the complex requirements for valve control in industry applications are also increasing.

[0003] However, in the prior art, conventional gas circuit control designs often rely only on the power gain and loss of a single solenoid valve to control the opening or closing of the valve, or rely on a single positioner to control the valve opening. Conventional gas circuit control designs can no longer meet users' complex needs for valve regulation. At the same time, in special projects such as petroleum, chemical, electric power, and medical care, when a gas circuit fails, conventional gas circuit control designs cannot automatically adjust the opening and closing state of the valve according to the type of fault, which can easily lead to safety accidents and affect production efficiency. Summary of the invention

[0004] The present invention provides a valve control device and method to solve the technical problem that conventional valve control devices and methods in the prior art cannot achieve safe, efficient and automatic control of valves under multiple working conditions.

[0005] To solve the above problems, the technical solution of the present invention is: a valve control device, including a driving mechanism and an air circuit system; A movable elastic diaphragm is provided in the sealed chamber in the driving mechanism, the elastic diaphragm divides the chamber in the driving mechanism into an upper chamber and a lower chamber which are sealed and isolated, and the elastic diaphragm is in transmission connection with the terminal valve, and the driving mechanism is configured to enable the elastic diaphragm to move by adjusting the air pressure difference between the upper chamber and the lower chamber in the driving mechanism, thereby driving the terminal valve to perform an opening and closing action; It is set that when the air pressure in the upper chamber is greater than the preset opening pressure, the elastic diaphragm moves toward the first direction to drive the terminal valve to close; The air circuit system is provided with a filter, a solenoid valve, a positioner and an air-controlled valve, the air inlet of the filter is connected to an air source, the first air outlet of the filter is connected to the air inlet of the solenoid valve through a pipeline, and the air outlet of the solenoid valve is connected to the signal air port of the air-controlled valve, so as to form a first air circuit; the second air outlet of the filter is connected to the air inlet of the positioner through a pipeline, the air outlet of the positioner is connected to the first air inlet of the air-controlled valve, and the air outlet of the air-controlled valve is connected to the upper chamber of the driving mechanism, so as to form a second air circuit; the third air outlet of the filter is connected to the second air inlet of the air-controlled valve through a pipeline, and the air outlet of the air-controlled valve is connected to the upper chamber of the driving mechanism, so as to form a third air circuit; The gas circuit system is configured to control the first air inlet and the second air inlet of the air-controlled valve to achieve interlocked opening and closing based on the opening and closing state of the solenoid valve. Only when the second air circuit is connected and there is gas supply, the gas output of the air-controlled valve is controlled by the positioner to adjust the opening amplitude of the terminal valve. Only when the third air circuit is connected and there is gas supply, the terminal valve is driven to close.

[0006] Preferably, the gas circuit system is further provided with a position-keeping valve, the fourth air outlet of the filter is connected to the signal air port of the position-keeping valve to form a fourth gas circuit; the air outlet of the air control valve is connected to the air inlet of the position-keeping valve, and the air outlet of the position-keeping valve is connected to the upper chamber of the driving mechanism; The retaining valve is configured such that when there is gas supply in the fourth gas circuit, the retaining valve is turned on, and the second gas circuit or the third gas circuit supplies pressure to the upper chamber of the driving mechanism through the retaining valve; when there is no gas supply in the fourth gas circuit, the retaining valve is turned off, and the existing gas pressure is maintained in the upper chamber of the driving mechanism.

[0007] Preferably, the driving mechanism comprises an upper membrane cover and a lower membrane cover, the upper membrane cover and the lower membrane cover are sealed and spliced ​​to form an inner chamber of the driving mechanism, the edge of the elastic membrane is sealingly and slidably connected to the side wall of the inner chamber of the driving mechanism, and a plurality of elastic members are further provided in the inner chamber of the driving mechanism, the top and bottom of the elastic members are fixedly connected to the bottom surface of the elastic membrane and the bottom surface of the inner chamber of the driving mechanism respectively; The driving mechanism is further configured such that when pressure is supplied to the upper chamber of the driving mechanism, the elastic diaphragm compresses the elastic member to move toward a first direction, thereby driving the terminal valve to close; and when pressure is released from the upper chamber of the driving mechanism, the elastic diaphragm stretches due to the elastic member, thereby moving in a direction opposite to the first direction, thereby driving the terminal valve to open.

[0008] Preferably, a vent hole is provided on the top of the upper membrane cover, and the air circuit system is also provided with an exhaust valve. The vent hole is sealed with the air outlet of the retaining valve and the air inlet of the exhaust valve respectively. When the exhaust valve is manually opened, the exhaust valve is used to release the air pressure in the upper chamber of the driving mechanism.

[0009] Preferably, a guide hole is provided at the bottom of the lower membrane cover, and a transmission shaft is provided passing through the guide hole. The top of the transmission shaft is fixedly connected to the bottom surface of the elastic diaphragm, and the bottom of the transmission shaft is fixedly connected to the driving part of the terminal valve. When the elastic diaphragm moves forward or reversely along the first direction, it moves synchronously with the transmission shaft.

[0010] Preferably, the driving mechanism is further provided with a handwheel assembly, the handwheel assembly comprises a shaft housing, a rotating shaft and a handwheel body, a rotating shaft through hole is further provided on the top of the upper membrane cover, the bottom of the shaft housing is sealed and fixed to the top edge of the rotating shaft through hole, and an inner cavity penetrating along a first direction is provided inside the shaft housing, the inner cavity of the shaft housing is rotatably connected to the rotating shaft in a sealing thread, and the top of the rotating shaft is fixedly connected to the handwheel body; The handwheel assembly is configured to rotate the handwheel body. When the rotating shaft moves toward a first direction, the rotating shaft passes through the rotating shaft through hole and abuts against the top surface of the elastic diaphragm, driving the elastic diaphragm to move toward the first direction. When the rotating shaft moves in a direction opposite to the first direction, the elastic diaphragm moves in a direction opposite to the first direction due to the stretching of the elastic member.

[0011] Preferably, an electromagnetic sensor is provided in the terminal valve, the electromagnetic sensor is electrically connected to the central control device, and the electromagnetic sensor is used to monitor the opening amplitude of the terminal valve in real time.

[0012] Preferably, the positioner is electrically connected to a central control device, and the central control device is used to implement remote control of the gas output rate of the positioner.

[0013] Preferably, the air circuit system is also provided with a four-way pipe and a three-way pipe, the first pipe port of the four-way pipe is sealedly connected to the air outlet of the filter, the second pipe port of the four-way pipe is sealedly connected to the air inlet of the solenoid valve, the third pipe port of the four-way pipe is sealedly connected to the signal air port of the position-keeping valve, the fourth pipe port of the four-way pipe is sealedly connected to the first pipe port of the three-way pipe, the second pipe port of the three-way pipe is sealedly connected to the air inlet of the positioner, and the third pipe port of the three-way pipe is sealedly connected to the second air inlet of the air-controlled valve.

[0014] Based on the same concept, the present invention also provides a valve control method, which is applied to any of the above-mentioned valve control devices, and comprises the following steps: S1: If the gas source supplies gas and the power supply is on, the solenoid valve is turned on, the positioner works, the first air inlet of the air-controlled valve is opened, the second air inlet of the air-controlled valve is closed, and the position-holding valve is turned on. The gas is supplied to the upper chamber of the driving mechanism through the second gas path, and the gas output rate of the positioner is adjusted by the central control device to control the movement amplitude of the elastic diaphragm in the first direction, thereby indirectly controlling the opening amplitude of the terminal valve; S2: If the gas source is supplied and the power supply is cut off, the solenoid valve is automatically closed, the positioner loses power, the first air inlet of the air-controlled valve is closed, the second air inlet of the air-controlled valve is opened, and the position-holding valve is turned on. The gas continuously supplies pressure to the upper chamber of the driving mechanism through the third air path, controls the elastic diaphragm to move in the first direction, and drives the terminal valve to be completely closed; S21: After the terminal valve is closed urgently, if manual control is required, the gas supply is cut off, the exhaust valve is turned on, and after the air pressure in the upper chamber and the lower chamber of the driving mechanism is balanced, the hand wheel body is rotated to manually control the opening amplitude of the terminal valve; S3: If the gas source is cut off, the position-holding valve is automatically closed, the existing pressure is maintained in the upper chamber of the driving mechanism, the elastic diaphragm maintains the position before the gas source is cut off, and the terminal valve is driven to maintain the opening range before the gas source is cut off; S31: When the gas source is cut off, if manual control is required, the exhaust valve is turned on, and after the air pressure in the upper chamber and the lower chamber of the driving mechanism is balanced, the hand wheel body is rotated to manually control the opening range of the terminal valve.

[0015] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art: The present invention provides a valve control device and method, which can meet the automatic opening and closing control function of the valve under complex working conditions, ensure the safety of on-site operation and production, improve production efficiency, and facilitate fault inspection and maintenance. Specifically, a solenoid valve, a positioner, an air-controlled valve and a holding valve are provided. When the power supply is normally energized and the gas source is normally supplied, the automatic control gas is sequentially input into a driving mechanism after passing through the positioner and the air-controlled valve, and the opening amplitude of the terminal valve is indirectly controlled by controlling the gas output rate by the positioner; when the power supply is lost but the gas source is normally supplied, the automatic control gas is directly input into the driving mechanism after passing through the air-controlled valve, so that the terminal valve can be closed urgently, and the medium supply in the production pipeline is urgently cut off, so as to prevent the continuous medium supply from easily causing production accidents in the case of overall power failure; when the gas source is cut off, the automatic control holding valve is closed, so that the terminal valve maintains the working state before the gas source is cut off, so as to avoid production interruption due to temporary gas cut off and production loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1A three-dimensional structural diagram of a valve control device provided by the present invention; Figure 2 A cross-sectional schematic diagram of a valve control device provided by the present invention; Figure 3 A schematic structural diagram of a driving mechanism provided by the present invention; Figure 4 A gas circuit control diagram of a valve control device provided by the present invention; Figure 5 A schematic flow chart of a valve control method provided by the present invention.

[0017] Explanation of the reference numerals: 1: filter; 2: solenoid valve; 3: positioner; 4: air-controlled valve; 5: four-way valve; 6: three-way valve; 7: retaining valve; 8: exhaust valve; 9: upper membrane cover; 10: lower membrane cover; 11: elastic diaphragm; 12: upper chamber; 13: lower chamber; 14: elastic part; 15: vent hole; 16: guide hole; 17: transmission shaft; 18: shaft housing; 19: rotating shaft; 20: handwheel body; 21: terminal valve. DETAILED DESCRIPTION

[0018] The valve control device and method proposed by the present invention are further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims.

[0019] First embodiment See also Figures 1 to 4 , this embodiment provides a valve control device, which is suitable for realizing automatic control of the opening range of the terminal valve under multiple working conditions.

[0020] The valve control device body provided in this embodiment includes a driving mechanism and an air circuit system, wherein a closed chamber is provided inside the driving mechanism, and a movable elastic diaphragm 11 is provided in the sealed chamber inside the driving mechanism, and the elastic diaphragm 11 divides the inner chamber of the driving mechanism into an upper chamber 12 and a lower chamber 13 which are relatively sealed and isolated. At the same time, the elastic diaphragm 11 is arranged to be in transmission connection with the terminal valve 21. When the air pressure in the upper chamber 12 and the lower chamber 13 of the driving mechanism are not equal, the elastic diaphragm 11 can generate corresponding movement. In this embodiment, the direction of the elastic diaphragm 11 toward the side of the lower chamber 13 is set as the first direction. After high-pressure gas is supplied to the upper chamber 12, since the air pressure in the upper chamber 12 is greater than the pressure in the lower chamber 13, the elastic diaphragm 11 can automatically move toward the first direction, thereby driving the terminal valve 21 to perform a closing action. Conversely, if the elastic diaphragm 11 is displaced in a direction opposite to the first direction, the terminal valve 21 is driven to perform an opening action.

[0021] A filter 1, a solenoid valve 2, a positioner 3 and an air control valve 4 are provided in the air circuit system, the air inlet of the filter 1 is connected to the air source, the first air outlet of the filter 1 is connected to the air inlet of the solenoid valve 2 through a pipeline, and the air outlet of the solenoid valve 2 is connected to the signal air port of the air control valve 4, so as to construct a first air circuit, wherein the solenoid valve 2 is an electrical control device. In the present embodiment, it is set that when the solenoid valve 2 is energized, the solenoid valve 2 is turned on, that is, the first air circuit is turned on, and the signal air port of the air control valve 4 has gas input; conversely, when the solenoid valve 2 is de-energized, the solenoid valve 2 is turned off, that is, the first air circuit is turned off, and there is no gas input to the signal air port of the air control valve 4. The signal air port of the air control valve 4 is used to determine the opening and closing states of multiple groups of air inlets in the air control valve 4, which will be described in detail later.

[0022] The second air outlet of the filter 1 is connected to the air inlet of the positioner 3 through a pipeline, the air outlet of the positioner 3 is connected to the first air inlet of the air control valve 4, and the air outlet of the air control valve 4 is connected to the upper chamber 12 of the driving mechanism to form a second air circuit, wherein the positioner 3 is an electrical control device. In this embodiment, the gas output rate of the positioner 3 can be adjusted by remote control of the positioner 3 by the central control device, that is, the gas output amount of the air control valve 4 can be further controlled.

[0023] The third air outlet of the filter 1 is connected to the second air inlet of the air control valve 4 through a pipeline. The air outlet of the air control valve 4 shares the same pipeline with the first air circuit and is further connected to the upper chamber 12 of the driving mechanism to form a third air circuit. In this embodiment, when gas is input to the signal air port of the air control valve 4, the first air inlet of the air control valve 4 is set to be opened and the second air inlet is closed. Conversely, when there is no gas input to the signal air port of the air control valve 4, the first air inlet of the air control valve 4 is set to be closed and the second air inlet is opened.

[0024] In summary, this embodiment provides a valve control device, which automatically controls the first air inlet and the second air inlet of the air control valve 4 to realize interlocking opening and closing based on the opening and closing state of the solenoid valve 2, and realizes the function of automatic switching between the second air path and the third air path. Specifically, when the power supply is normal, the first air path is connected, enabling the air control valve 4 to adjust to the second air path being connected, and the gas is transmitted to the upper chamber 12 of the drive mechanism after passing through the filter 1, the positioner 3 and the air control valve 4. At the same time, by adjusting the gas output rate of the positioner 3, the air pressure value in the upper chamber 12 of the drive mechanism can be accurately controlled, and the transmission connection between the elastic diaphragm 11 and the terminal valve can indirectly realize the accurate control of the opening amplitude of the terminal valve 21. However, when the power is cut off, the solenoid valve 2 loses power, causing the first gas circuit to be shut down, enabling the air control valve 4 to adjust to the third gas circuit to be open. The gas is directly transmitted to the upper chamber 12 of the drive mechanism after passing through the air control valve 4, causing the air pressure in the upper chamber 12 of the drive mechanism to quickly reach a high pressure state, driving the terminal valve 21 to automatically execute the closing action. That is, when a large-scale power outage occurs on the production line, the terminal valve 21 is automatically closed in an emergency, causing the medium supply in the production line pipeline to be cut off, thereby avoiding production accidents in the back-end production line.

[0025] The details of a valve control device provided in this embodiment will be described in further detail below: In this embodiment, a position-keeping valve 7 is also provided in the gas circuit system, and the fourth gas outlet of the filter 1 is connected to the signal gas outlet of the position-keeping valve 7 to form a fourth gas circuit, wherein the signal gas outlet of the position-keeping valve 7 is used to determine the working state of the position-keeping valve 7. When gas is input to the signal gas outlet of the position-keeping valve 7, the position-keeping valve 7 is in a conducting state, and vice versa, when gas is not input to the signal gas outlet of the position-keeping valve 7, the position-keeping valve 7 is in a closed state. At the same time, the position-keeping valve 7 is also connected in series in the second gas circuit and the third gas circuit, that is, the gas outlet of the gas control valve 4 is connected to the gas inlet of the position-keeping valve 7, and the gas outlet of the position-keeping valve 7 is connected to the upper chamber 12 of the driving mechanism.

[0026] When the gas source is supplied normally, there is gas supplied in the fourth gas circuit, the holding valve 7 is turned on, and the gas can be supplied to the upper chamber 12 of the driving mechanism through the second gas circuit or the third gas circuit via the holding valve 7. However, when the gas source is cut off, there is no gas supply in the fourth gas circuit, the holding valve 7 is turned off, and the upper chamber 12 of the driving mechanism is in a sealed state. The existing air pressure is maintained in the upper chamber 12 of the driving mechanism, that is, the elastic diaphragm 11 maintains the position before the gas source is cut off, and the driving terminal valve 21 maintains the opening range before the gas source is cut off. Therefore, when the gas source is temporarily cut off, the holding function of the holding valve 7 can keep the terminal valve 21 stable, which can effectively avoid production interruption caused by temporary gas cut-off and cause production losses.

[0027] Preferably, in this embodiment, the driving mechanism includes an upper membrane cover 9 and a lower membrane cover 10, which are sealed and spliced ​​to form an external shell of the driving mechanism, and an inner chamber is formed inside the driving mechanism, the edge of the elastic diaphragm 11 is sealed and slidably connected to the side wall of the inner chamber of the driving mechanism, and a plurality of elastic members 14 are also provided in the inner chamber of the driving mechanism, and the top and bottom of the elastic members 14 are fixedly connected to the bottom surface of the elastic diaphragm 11 and the bottom surface of the inner chamber of the driving mechanism respectively. When pressure is supplied to the upper chamber 12 of the driving mechanism, the elastic diaphragm 11 can compress the elastic member 14 under the action of the air pressure of the upper chamber 12 and move toward the first direction, and the driving terminal valve 21 is closed. On the contrary, when the pressure is released in the upper chamber 12 of the driving mechanism, the air pressure difference between the upper chamber 12 and the lower chamber 13 gradually decreases, and the elastic diaphragm 11 moves in the opposite direction to the first direction due to the expansion of the elastic member 14, and the driving terminal valve is opened. In another embodiment, the elastic diaphragm 11 can be connected to the inner chamber of the driving mechanism in such a way that the edge of the elastic diaphragm 11 is fixedly connected to the midpoint of the side wall of the inner chamber of the driving mechanism. The elastic diaphragm 11 is made of an elastic material. When the air pressure in the upper chamber 12 increases, the elastic diaphragm 11 can also overcome the elastic force of the elastic member 14 and move toward the first direction. Conversely, when the air pressure in the upper chamber 12 decreases, the elastic diaphragm 11 can also withstand the elastic force of the elastic member 14 and move in a direction opposite to the first direction.

[0028] Preferably, in the present embodiment, a vent hole 15 is provided on the top of the upper membrane cover 9, and an exhaust valve 8 is also provided in the air circuit system. The vent hole 15 is sealedly connected to the air outlet of the retaining valve 7 and the air inlet of the exhaust valve 8, respectively. When the air source is cut off and the retaining valve 7 is closed, so that a high pressure state is maintained in the upper chamber 12 of the driving mechanism, the exhaust valve 8 can be manually opened to release the high-pressure gas in the upper chamber 12 of the driving mechanism.

[0029] Furthermore, in the present embodiment, a guide hole 16 is provided at the bottom of the lower membrane cover 10, and a transmission shaft 17 is provided to pass through the guide hole 16. The top of the transmission shaft 17 is fixedly connected to the bottom surface of the elastic diaphragm 11, and the bottom of the transmission shaft 17 is fixedly connected to the driving part of the terminal valve 21. When the elastic diaphragm 11 moves forward or reversely along the first direction, it moves synchronously with the transmission shaft 17, thereby realizing the control of the opening amplitude of the terminal valve 21. The specific structure of the terminal valve 21 is not specifically limited in the present embodiment, and the terminal valve 21 only needs to satisfy the existence of two working states: open and closed.

[0030] Furthermore, in the present embodiment, the driving mechanism is further provided with a handwheel assembly, which includes a shaft housing 18, a rotating shaft 19 and a handwheel body 20. A rotating shaft 19 through hole is further provided at the top of the upper membrane cover 9. The bottom of the shaft housing 18 is sealed and fixed to the top edge of the rotating shaft 19 through hole. An inner cavity extending through the shaft housing 18 in a first direction is provided inside the shaft housing 18, and an inner thread is provided in the inner cavity. An outer thread matching the inner thread of the shaft housing 18 is provided on the outer surface of the rotating shaft 19, so that the inner cavity of the shaft housing 18 and the rotating shaft 19 can realize a sealed threaded rotation connection, and the top of the rotating shaft 19 is fixedly connected to the handwheel body 20.

[0031] In the present embodiment, when the gas source is cut off, if it is necessary to manually control the opening amplitude of the terminal valve 21, the exhaust valve 8 can be opened first to release the high-pressure gas in the upper chamber 12 of the driving mechanism. When the air pressure in the upper chamber 12 and the lower chamber 13 of the driving mechanism is balanced, the handwheel body 20 can be manually rotated to drive the rotating shaft 19 to move in the first direction. When the rotating shaft 19 moves toward the first direction, the rotating shaft 19 can pass through the rotating shaft 19 through hole and abut against the top surface of the elastic diaphragm 11, driving the elastic diaphragm 11 to move in the first direction, thereby realizing the closing control of the terminal valve 21. Conversely, when the rotating shaft 19 moves in a direction opposite to the first direction, the elastic diaphragm 11 moves in a direction opposite to the first direction due to the stretching of the elastic member 14, thereby realizing the opening control of the terminal valve 21.

[0032] Preferably, in this embodiment, an electromagnetic sensor is provided in the terminal valve, and the electromagnetic sensor is electrically connected to the central control device. The electromagnetic sensor adopts a non-contact detection method. When the terminal valve is opened or closed, the position of the magnet installed on the terminal valve relative to the electromagnetic sensor changes, thereby causing a change in the magnetic field strength. The electromagnetic sensor is used to determine the real-time opening amplitude of the terminal valve 21 by detecting the real-time changes of the magnetic field, so as to facilitate the valve control device to achieve more accurate and visual control of the terminal valve 21.

[0033] Preferably, in this embodiment, the positioner 3 is electrically connected to the central control device, and manual control of the gas output rate of the positioner 3 can be achieved based on the central control device, meeting the remote and precise control requirements of the opening range of the terminal valve 21.

[0034] Preferably, in the present embodiment, the gas circuit system is further provided with a four-way valve 5 and a three-way valve 6, the first pipe opening of the four-way valve 5 is sealedly connected to the air outlet of the filter 1, the second pipe opening of the four-way valve 5 is sealedly connected to the air inlet of the solenoid valve 2, the third pipe opening of the four-way valve 5 is sealedly connected to the signal air port of the retaining valve 7, the fourth pipe opening of the four-way valve 5 is sealedly connected to the first pipe opening of the three-way valve 6, the second pipe opening of the three-way valve 6 is sealedly connected to the air inlet of the positioner 3, and the third pipe opening of the three-way valve 6 is sealedly connected to the second air inlet of the air control valve 4. The four-way valve 5 cooperates with the three-way valve 6 to form the first gas circuit, the second gas circuit, the third gas circuit and the fourth gas circuit, so as to ensure that when the gas source is supplied normally, the gas output by the filter 1 can be fully circulated through each gas circuit.

[0035] Second embodiment Based on the same concept, the present invention also provides a valve control method, which is applied to the valve control device described in any one of the first embodiments above. Figure 5 , including the following steps: S1: If the gas source is supplying gas normally and the power supply is supplying power normally, the solenoid valve 2 is turned on, the positioner 3 works, the first air inlet of the air control valve 4 is opened, the second air inlet of the air control valve 4 is closed, and the retaining valve 7 is turned on. The gas is supplied to the upper chamber 12 of the driving mechanism through the second gas path. The gas output rate of the positioner 3 is adjusted by the central control device, and the movement amplitude of the elastic diaphragm 11 in the first direction can be controlled, thereby indirectly controlling the opening amplitude of the terminal valve 21.

[0036] S2: If the gas source is supplying gas normally but the power fails, the solenoid valve 2 is automatically closed, the positioner 3 is powered off, the first air inlet of the air control valve 4 is closed, the second air inlet of the air control valve 4 is opened, the retaining valve 7 remains open, and the gas is continuously supplied with pressure to the upper chamber 12 of the driving mechanism through the third air path, and the elastic diaphragm 11 is controlled to continuously move in the first direction until the terminal valve 21 is driven to be completely closed, so that when the power fails, the terminal valve 21 can realize the automatic emergency closing function, and quickly cut off the medium supply in the production line.

[0037] S21: When the terminal valve 21 is closed urgently, if manual intervention is required to realize manual control of the terminal valve 21, the gas supply is first cut off, and the exhaust valve 8 is turned on to release the high-pressure gas in the upper chamber 12 of the driving mechanism. After the air pressure in the upper chamber 12 and the lower chamber 13 of the driving mechanism is balanced, the hand wheel body 20 is rotated to manually control the opening amplitude of the terminal valve 21.

[0038] S3: If the special situation of gas source cutting off occurs, the position-holding valve 7 is automatically closed, the existing pressure is maintained in the upper chamber 12 of the driving mechanism, the elastic diaphragm 11 maintains the position before the gas source is cut off, and the terminal valve 21 is driven to maintain the opening range before the gas source is cut off, so that the terminal valve 21 remains stable and the medium in the production line pipeline continues to flow at the original transmission rate.

[0039] S31: After the gas source is cut off, if manual intervention is required to realize manual control of the terminal valve 21, the exhaust valve 8 is first opened to release the high-pressure gas in the upper chamber 12 of the driving mechanism. After the air pressure in the upper chamber 12 and the lower chamber 13 of the driving mechanism is balanced, the hand wheel body 20 is rotated to manually control the opening amplitude of the terminal valve 21.

[0040] In summary, this embodiment provides a valve control method based on the gas circuit control design. When the power fails and the gas source is cut off, the emergency closing and position holding control functions of the terminal valve 21 can be automatically realized, thereby effectively ensuring the safety of on-site operation and production, improving production efficiency, and facilitating fault inspection and repair.

[0041] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

[0042] It should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

Claims

1. A valve control device, characterized in that: Including driving mechanism and gas circuit system; A movable elastic diaphragm is provided in the sealed chamber in the driving mechanism, the elastic diaphragm divides the chamber in the driving mechanism into an upper chamber and a lower chamber which are sealed and isolated, and the elastic diaphragm is in transmission connection with the terminal valve, and the driving mechanism is configured to enable the elastic diaphragm to move by adjusting the air pressure difference between the upper chamber and the lower chamber in the driving mechanism, thereby driving the terminal valve to perform an opening and closing action; It is set that when the air pressure in the upper chamber is greater than the preset opening pressure, the elastic diaphragm moves toward the first direction to drive the terminal valve to close; The air circuit system is provided with a filter, a solenoid valve, a positioner and an air control valve, the air inlet of the filter is connected to an air source, the first air outlet of the filter is connected to the air inlet of the solenoid valve through a pipeline, the air outlet of the solenoid valve is connected to the signal air port of the air control valve, so as to form a first air circuit; the second air outlet of the filter is connected to the air inlet of the positioner through a pipeline, the air outlet of the positioner is connected to the first air inlet of the air control valve, the air outlet of the air control valve is connected to the upper chamber of the driving mechanism, so as to form a second air circuit; The third air outlet of the filter is connected to the second air inlet of the air control valve through a pipeline, and the air outlet of the air control valve is connected to the upper chamber of the driving mechanism to form a third air path; The gas circuit system is configured to control the first air inlet and the second air inlet of the air-controlled valve to achieve interlocked opening and closing based on the opening and closing state of the solenoid valve. Only when the second air circuit is connected and there is gas supply, the gas output of the air-controlled valve is controlled by the positioner to adjust the opening amplitude of the terminal valve. Only when the third air circuit is connected and there is gas supply, the terminal valve is driven to close.

2. The valve control device according to claim 1, characterized in that: The gas circuit system is also provided with a position-keeping valve, the fourth air outlet of the filter is connected to the signal air outlet of the position-keeping valve, so as to form a fourth gas circuit; the air outlet of the air control valve is connected to the air inlet of the position-keeping valve, and the air outlet of the position-keeping valve is connected to the upper chamber of the driving mechanism; The retaining valve is configured such that when there is gas supply in the fourth gas circuit, the retaining valve is turned on, and the second gas circuit or the third gas circuit supplies pressure to the upper chamber of the driving mechanism through the retaining valve; when there is no gas supply in the fourth gas circuit, the retaining valve is turned off, and the existing gas pressure is maintained in the upper chamber of the driving mechanism.

3. The valve control device according to claim 1, characterized in that: The driving mechanism comprises an upper membrane cover and a lower membrane cover, the upper membrane cover and the lower membrane cover are sealed and spliced ​​to form an inner chamber of the driving mechanism, the edge of the elastic membrane is sealingly and slidably connected to the side wall of the inner chamber of the driving mechanism, and a plurality of elastic members are further provided in the inner chamber of the driving mechanism, the top and bottom of the elastic members are fixedly connected to the bottom surface of the elastic membrane and the bottom surface of the inner chamber of the driving mechanism respectively; The driving mechanism is further configured such that when pressure is supplied to the upper chamber of the driving mechanism, the elastic diaphragm compresses the elastic member to move toward a first direction, thereby driving the terminal valve to close; and when pressure is released from the upper chamber of the driving mechanism, the elastic diaphragm stretches due to the elastic member, thereby moving in a direction opposite to the first direction, thereby driving the terminal valve to open.

4. The valve control device according to claim 3, characterized in that: A vent hole is provided on the top of the upper membrane cover, and the air circuit system is also provided with an exhaust valve. The vent hole is sealed with the air outlet of the retaining valve and the air inlet of the exhaust valve respectively. When the exhaust valve is opened manually, the exhaust valve is used to release the air pressure in the upper chamber of the driving mechanism.

5. The valve control device according to claim 3, characterized in that: A guide hole is provided at the bottom of the lower membrane cover, and a transmission shaft is provided to pass through the guide hole. The top of the transmission shaft is fixedly connected to the bottom surface of the elastic diaphragm, and the bottom of the transmission shaft is fixedly connected to the driving part of the terminal valve. When the elastic diaphragm moves forward or reversely along the first direction, it moves synchronously with the transmission shaft.

6. The valve control device according to claim 3, characterized in that: The driving mechanism is also provided with a handwheel assembly, which includes a shaft housing, a rotating shaft and a handwheel body. A rotating shaft through hole is also provided on the top of the upper membrane cover. The bottom of the shaft housing is sealed and fixed to the top edge of the rotating shaft through hole. An inner cavity penetrating along a first direction is provided inside the shaft housing. The inner cavity of the shaft housing is rotatably connected to the rotating shaft in a sealed threaded manner. The top of the rotating shaft is fixedly connected to the handwheel body. The handwheel assembly is configured to rotate the handwheel body. When the rotating shaft moves toward a first direction, the rotating shaft passes through the rotating shaft through hole and abuts against the top surface of the elastic diaphragm, driving the elastic diaphragm to move toward the first direction. When the rotating shaft moves in a direction opposite to the first direction, the elastic diaphragm moves in a direction opposite to the first direction due to the stretching of the elastic member.

7. The valve control device according to claim 1, characterized in that: An electromagnetic sensor is provided in the terminal valve, the electromagnetic sensor is electrically connected to the central control device, and the electromagnetic sensor is used to monitor the opening amplitude of the terminal valve in real time.

8. The valve control device according to claim 1, characterized in that: The positioner is electrically connected to a central control device, and the central control device is used to implement remote control of the gas output rate of the positioner.

9. The valve control device according to claim 1, characterized in that: The air circuit system is also provided with a four-way pipe and a three-way pipe, the first pipe port of the four-way pipe is sealedly connected to the air outlet of the filter, the second pipe port of the four-way pipe is sealedly connected to the air inlet of the solenoid valve, the third pipe port of the four-way pipe is sealedly connected to the signal air port of the position-keeping valve, the fourth pipe port of the four-way pipe is sealedly connected to the first pipe port of the three-way pipe, the second pipe port of the three-way pipe is sealedly connected to the air inlet of the positioner, and the third pipe port of the three-way pipe is sealedly connected to the second air inlet of the air-controlled valve.

10. A valve control method, characterized in that: The valve control device as claimed in any one of claims 1 to 9 comprises the following steps: S1: If the gas source supplies gas and the power supply is on, the solenoid valve is turned on, the positioner works, the first air inlet of the air-controlled valve is opened, the second air inlet of the air-controlled valve is closed, and the position-holding valve is turned on. The gas is supplied to the upper chamber of the driving mechanism through the second gas path, and the gas output rate of the positioner is adjusted by the central control device to control the movement amplitude of the elastic diaphragm in the first direction, thereby indirectly controlling the opening amplitude of the terminal valve; S2: If the gas source is supplied and the power supply is cut off, the solenoid valve is automatically closed, the positioner loses power, the first air inlet of the air-controlled valve is closed, the second air inlet of the air-controlled valve is opened, and the position-holding valve is turned on. The gas continuously supplies pressure to the upper chamber of the driving mechanism through the third air path, controls the elastic diaphragm to move in the first direction, and drives the terminal valve to be completely closed; S21: After the terminal valve is closed urgently, if manual control is required, the gas supply is cut off, the exhaust valve is turned on, and after the air pressure in the upper chamber and the lower chamber of the driving mechanism is balanced, the hand wheel body is rotated to manually control the opening amplitude of the terminal valve; S3: If the gas source is cut off, the position-holding valve is automatically closed, the existing pressure is maintained in the upper chamber of the driving mechanism, the elastic diaphragm maintains the position before the gas source is cut off, and the terminal valve is driven to maintain the opening range before the gas source is cut off; S31: When the gas source is cut off, if manual control is required, the exhaust valve is turned on, and after the air pressure in the upper chamber and the lower chamber of the driving mechanism is balanced, the hand wheel body is rotated to manually control the opening range of the terminal valve.

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