Valve control device and method

Abstract

The application provides a valve control device and method, a movable elastic diaphragm is arranged in a chamber of a driving mechanism, and the chamber is divided into an upper chamber and a lower chamber by the elastic diaphragm, the elastic diaphragm is connected with a terminal valve, an air path system is provided with a filter, an electromagnetic valve, a positioner, an air control valve and a holding valve, and a first air path, a second air path, a third air path and a fourth air path are respectively formed, under a power-on air supply condition, the opening range of the terminal valve can be remotely controlled through the positioner, under a power-off condition, the terminal valve can be automatically and urgently closed, and under a gas-off condition, the terminal valve can maintain the original opening range. Through the application, adaptive opening and closing control of the terminal valve under complex working conditions is realized, safe closing of the terminal valve under emergency conditions is realized, and fault maintenance is facilitated.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of valves, and particularly relates to a valve control device and method. BACKGROUND

[0002] In the field of industrial automation, air path control design is one of the important means to realize accurate control and automatic operation of valve devices, and is widely used in manufacturing, chemical industry, energy and other industries. Through reasonable air path design and effective control strategy, 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 emergency situations, the actuator action is automatically stopped to improve the safety of the system. With the continuous development of the industry, the complex requirements for valve control in the industry are also increasing.

[0003] However, in the prior art, conventional air path control design often relies on the power loss of a single solenoid valve to control the opening or closing of the valve, or relies on a single positioner to control the valve opening. Conventional air path control design cannot meet the complex needs of users for valve control. In addition, in special projects such as petroleum, chemical industry, power and medical treatment, the conventional air path control design cannot automatically control the opening and closing state of the valve according to the fault type after the air path fails, which is easy to cause safety accidents and affect production efficiency. SUMMARY

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

[0005] To solve the above problems, the technical scheme of the present application is as follows: a valve control device, comprising a driving mechanism and an air path system;

[0006] An elastic diaphragm is arranged in the sealed chamber of the driving mechanism, which divides the chamber into an upper chamber and a lower chamber, and the elastic diaphragm is connected with the terminal valve. The driving mechanism is configured to adjust the pressure difference between the upper chamber and the lower chamber to move the elastic diaphragm and drive the terminal valve to open and close.

[0007] When the pressure in the upper chamber is greater than the preset opening pressure, the elastic diaphragm moves towards the first direction to drive the terminal valve to close.

[0008] The gas path system is provided with a filter, a solenoid valve, a positioner and a gas control valve, the gas inlet of the filter is connected with a gas source, the first gas outlet of the filter is connected with the gas inlet of the solenoid valve through a pipeline, the gas outlet of the solenoid valve is connected with the signal gas inlet of the gas control valve, and a first gas path is formed; the second gas outlet of the filter is connected with the gas inlet of the positioner through a pipeline, the gas outlet of the positioner is connected with the first gas inlet of the gas control valve, the gas outlet of the gas control valve is connected with the upper chamber of the driving mechanism, and a second gas path is formed; the third gas outlet of the filter is connected with the second gas inlet of the gas control valve through a pipeline, and the gas outlet of the gas control valve is connected with the upper chamber of the driving mechanism, and a third gas path is formed.

[0009] The gas path system is configured to control the first gas inlet and the second gas inlet of the gas control valve to realize interlocking opening and closing based on the opening and closing state of the solenoid valve, control the gas output of the gas control valve through the positioner only when the second gas path is conducted and gas is supplied, and then adjust the opening range of the terminal valve, and drive the terminal valve to close only when the third gas path is conducted and gas is supplied.

[0010] Preferably, the gas path system is further provided with a position holding valve, the fourth gas outlet of the filter is connected with the signal gas inlet of the position holding valve, and a fourth gas path is formed; the gas outlet of the gas control valve is connected with the gas inlet of the position holding valve, and the gas outlet of the position holding valve is connected with the upper chamber of the driving mechanism;

[0011] The position holding valve is configured to be conducted when gas is supplied in the fourth gas path, and the second gas path or the third gas path supplies pressure to the upper chamber of the driving mechanism through the position holding valve, and the position holding valve is turned off when there is no gas supply in the fourth gas path, and the existing gas pressure in the upper chamber of the driving mechanism is maintained.

[0012] 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 diaphragm is in sealed sliding connection with the side wall of the inner chamber of the driving mechanism, and a plurality of elastic members are further arranged in the inner chamber of the driving mechanism, the top and bottom of the elastic members are fixedly connected with the bottom surface of the elastic diaphragm and the bottom surface of the inner chamber of the driving mechanism respectively;

[0013] The driving mechanism is further configured to move the elastic member towards a first direction by compression of the elastic diaphragm when pressure is supplied to the upper chamber of the driving mechanism, and drive the terminal valve to close, and move towards a direction opposite to the first direction due to the relaxation of the elastic member when the pressure in the upper chamber of the driving mechanism is released, and drive the terminal valve to open.

[0014] Preferably, the upper membrane cover is provided with a vent hole, and the gas path system is further provided with an exhaust valve, and the vent hole is in sealed connection with the gas outlet of the holding valve and the gas inlet of the exhaust valve respectively, and the exhaust valve is used for releasing the air pressure in the upper chamber of the driving mechanism when the exhaust valve is opened manually.

[0015] Preferably, the lower membrane cover is provided with a guide hole, and a transmission shaft penetrates through the guide hole, the top of the transmission shaft is fixedly connected with the bottom surface of the elastic diaphragm, and the bottom of the transmission shaft is fixedly connected with the driving part of the terminal valve, and the transmission shaft is synchronously moved when the elastic diaphragm moves in the first direction.

[0016] Preferably, the driving mechanism is further provided with a hand wheel assembly, the hand wheel assembly comprises a shaft body shell, a rotating shaft and a hand wheel body, the upper membrane cover is further provided with a rotating shaft through hole, the bottom of the shaft body shell is in sealed fixed connection with the top edge of the rotating shaft through hole, and the shaft body shell is internally provided with an inner cavity penetrating in the first direction, the inner cavity of the shaft body shell is in sealed threaded rotary connection with the rotating shaft, and the top of the rotating shaft is fixedly connected with the hand wheel body.

[0017] The hand wheel assembly is configured to rotate the hand wheel body, the rotating shaft penetrates through the rotating shaft through hole and abuts against the top surface of the elastic diaphragm when the rotating shaft moves towards the first direction, and drives the elastic diaphragm to move towards the first direction, and the elastic diaphragm moves towards the direction opposite to the first direction due to the relaxation of the elastic member when the rotating shaft moves towards the direction opposite to the first direction.

[0018] Preferably, the terminal valve is provided with an electromagnetic sensor, and the electromagnetic sensor is electrically connected with a central control device, and the electromagnetic sensor is used for monitoring the opening amplitude of the terminal valve in real time.

[0019] Preferably, the positioner is electrically connected with the central control device, and the central control device is used for realizing remote control of the gas output rate of the positioner.

[0020] Preferably, the gas path system is further provided with a four-way valve and a three-way valve, the first pipe opening of the four-way valve is in sealed connection with the gas outlet of the filter, the second pipe opening of the four-way valve is in sealed connection with the gas inlet of the electromagnetic valve, the third pipe opening of the four-way valve is in sealed connection with the signal gas port of the holding valve, the fourth pipe opening of the four-way valve is in sealed connection with the first pipe opening of the three-way valve, the second pipe opening of the three-way valve is in sealed connection with the gas inlet of the positioner, and the third pipe opening of the three-way valve is in sealed connection with the second gas inlet of the air control valve.

[0021] Based on the same concept, the application also provides a valve control method applied to the valve control device, comprising the following steps:

[0022] S1: If the gas source supplies gas and the power supply supplies power, the electromagnetic valve is turned on, the positioner works, the first air inlet of the air control valve is opened, the second air inlet of the air control valve is closed, and the position valve is turned on, the gas is supplied to the upper chamber of the driving mechanism through the second gas path, the gas output rate of the positioner is adjusted through the central control equipment, the moving range of the elastic diaphragm in the first direction is controlled, and the opening range of the terminal valve is indirectly controlled;

[0023] S2: If the gas source supplies gas and the power supply is powered off, the electromagnetic valve is automatically turned off, the positioner loses power, the first air inlet of the air control valve is closed, the second air inlet of the air control valve is opened, and the position valve is turned on, the gas is continuously supplied to the upper chamber of the driving mechanism through the third gas path, the elastic diaphragm is controlled to move in the first direction, and the terminal valve is driven to be completely closed;

[0024] S21: When the terminal valve is urgently closed, if manual control is needed, the gas source supply is cut off, the exhaust valve is turned on, after the gas pressure in the upper chamber and the lower chamber of the driving mechanism is balanced, the hand wheel body is rotated, and the opening range of the terminal valve is manually controlled;

[0025] S3: If the gas source is disconnected, the position valve is automatically turned off, the existing pressure in the upper chamber of the driving mechanism is maintained, the elastic diaphragm remains at the position before the gas source is disconnected, and the terminal valve is driven to maintain the opening range before the gas source is disconnected;

[0026] S31: When the gas source is disconnected, if manual control is needed, the exhaust valve is turned on, after the gas pressure in the upper chamber and the lower chamber of the driving mechanism is balanced, the hand wheel body is rotated, and the opening range of the terminal valve is manually controlled.

[0027] The application has the following advantages and positive effects compared with the prior art due to the use of the above technical scheme:

[0028] The application provides a valve control device and method, which meets the automatic opening and closing control function of the valve under complex working conditions, guarantees the safety of field operation and production, improves production efficiency, and is convenient for fault maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The application provides a three-dimensional structural diagram of the valve control device.

[0030] Figure 2 The application provides a sectional view of the valve control device.

[0031] Figure 3 The application provides a structural diagram of the driving mechanism.

[0032] Figure 4 The application provides a gas path control diagram of the valve control device.

[0033] Figure 5 The application provides a flowchart of the valve control method.

[0034] The application provides a three-dimensional structural diagram of the valve control device. DETAILED DESCRIPTION

[0035] The application provides a three-dimensional structural diagram of the valve control device.

[0036] The application provides a three-dimensional structural diagram of the valve control device.

[0037] The application provides a three-dimensional structural diagram of the valve control device. Figures 1 to 4The embodiment provides a valve control device which is suitable for realizing automatic control of opening amplitude of a terminal valve under multiple working conditions.

[0038] The valve control device provided by the embodiment comprises a driving mechanism and a gas circuit system, wherein the driving mechanism is internally provided with a closed cavity, a movable elastic diaphragm 11 is arranged in the sealed cavity in the driving mechanism, the elastic diaphragm 11 divides the inner cavity of the driving mechanism into an upper cavity 12 and a lower cavity 13 which are relatively sealed and isolated, and the elastic diaphragm 11 is arranged in transmission connection with the terminal valve 21; when the gas pressure in the upper cavity 12 and the lower cavity 13 of the driving mechanism is not equal, the elastic diaphragm 11 can move correspondingly; in the embodiment, the direction of the elastic diaphragm 11 towards the lower cavity 13 is defined as a first direction; when high-pressure gas is supplied into the upper cavity 12, the elastic diaphragm 11 can automatically move towards the first direction due to the fact that the gas pressure in the upper cavity 12 is greater than that in the lower cavity 13, thereby driving the terminal valve 21 to perform a closing action; conversely, if the elastic diaphragm 11 moves towards a direction opposite to the first direction, the terminal valve 21 is driven to perform an opening action.

[0039] The gas circuit system is provided with a filter 1, a solenoid valve 2, a positioner 3 and a gas control valve 4; the gas inlet of the filter 1 is connected with a gas source; the first gas outlet of the filter 1 is connected with the gas inlet of the solenoid valve 2 through a pipeline; the gas outlet of the solenoid valve 2 is connected with the signal gas inlet of the gas control valve 4, thereby forming a first gas circuit; the solenoid valve 2 is an electric control device; in the embodiment, when the solenoid valve 2 is powered, the solenoid valve 2 is turned on, i.e., the first gas circuit is turned on, and the signal gas inlet of the gas control valve 4 has gas input; conversely, when the solenoid valve 2 is powered off, the solenoid valve 2 is turned off, i.e., the first gas circuit is turned off, and the signal gas inlet of the gas control valve 4 has no gas input; the signal gas inlet of the gas control valve 4 is used to determine the opening and closing states of multiple gas inlets in the gas control valve 4, which will be described in detail below.

[0040] The second gas outlet of the filter 1 is connected with the gas inlet of the positioner 3 through a pipeline; the gas outlet of the positioner 3 is connected with the first gas inlet of the gas control valve 4; the gas outlet of the gas control valve 4 is connected with the upper cavity 12 of the driving mechanism, thereby forming a second gas circuit; the positioner 3 is an electric control device; in the embodiment, the remote control of the positioner 3 by a central control device can realize the adjustment of the gas output rate of the positioner 3, i.e., further control the gas output of the gas control valve 4.

[0041] The third gas outlet of the filter 1 is connected with the second gas inlet of the air control valve 4 through a pipeline, the gas outlet of the air control valve 4 shares the same pipeline with the first gas path and is further connected with the upper chamber 12 of the driving mechanism, thereby forming a third gas path. In the embodiment, when the signal gas inlet of the air control valve 4 has gas input, the first gas inlet of the air control valve 4 is set to be opened and the second gas inlet is set to be closed. Conversely, when the signal gas inlet of the air control valve 4 has no gas input, the first gas inlet of the air control valve 4 is set to be closed and the second gas inlet is set to be opened.

[0042] In summary, the embodiment provides a valve control device, which automatically controls the first gas inlet and the second gas inlet of the air control valve 4 to realize interlocking opening and closing based on the opening and closing state of the electromagnetic valve 2, thereby realizing the automatic switching function of the second gas path and the third gas path. Specifically, when the power supply is normally powered, the first gas path is turned on, so that the air control valve 4 is adjusted to turn on the second gas path, and the gas is transmitted to the upper chamber 12 of the driving 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 driving mechanism can be accurately controlled. Through the transmission connection of the elastic diaphragm 11 and the terminal valve, the accurate control of the opening range of the terminal valve 21 is indirectly realized. However, when the power supply is interrupted, the electromagnetic valve 2 loses power, the first gas path is turned off, the air control valve 4 is adjusted to turn on the third gas path, the gas is directly transmitted to the upper chamber 12 of the driving mechanism after passing through the air control valve 4, so that the air pressure in the upper chamber 12 of the driving mechanism quickly reaches a high pressure state, and the terminal valve 21 is driven to automatically execute the closing action. That is, when the power supply of the production line is interrupted on a large scale, the terminal valve 21 is automatically closed in an emergency, so that the medium supply in the pipeline of the production line is cut off, and production accidents in the rear-end production line are avoided.

[0043] Next, the details of the valve control device provided in the embodiment will be further described:

[0044] In the embodiment, a position maintaining valve 7 is further arranged in the gas path system, the fourth gas outlet of the filter 1 is connected with the signal gas inlet of the position maintaining valve 7, thereby forming a fourth gas path. The signal gas inlet of the position maintaining valve 7 is used to determine the working state of the position maintaining valve 7. When the signal gas inlet of the position maintaining valve 7 has gas input, the position maintaining valve 7 is in an open state. Conversely, when the signal gas inlet of the position maintaining valve 7 has no gas input, the position maintaining valve 7 is in a closed state. At the same time, the position maintaining valve 7 is further connected in series with the second gas path and the third gas path, that is, the gas outlet of the air control valve 4 is connected with the gas inlet of the position maintaining valve 7, and the gas outlet of the position maintaining valve 7 is connected with the upper chamber 12 of the driving mechanism.

[0045] When the gas source is normally supplied, the fourth gas path has gas supply, 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 path or the third gas path via the holding valve 7. However, when the gas source is interrupted, the fourth gas path has no gas supply, the holding valve 7 is turned off, the upper chamber 12 of the driving mechanism is in a sealed state, and the existing gas pressure in the upper chamber 12 of the driving mechanism is maintained. That is, the elastic diaphragm 11 maintains the position before the interruption of the gas source, and the driving terminal valve 21 maintains the opening range before the interruption of the gas source. Therefore, when the gas source is temporarily interrupted, the holding function of the holding valve 7 can maintain the terminal valve 21 stable, which can effectively avoid the interruption of production and the loss of production caused by the temporary interruption of the gas source.

[0046] Preferably, in the embodiment, the driving mechanism includes an upper membrane cover 9 and a lower membrane cover 10. The upper membrane cover 9 and the lower membrane cover 10 are sealed and spliced to form an external shell of the driving mechanism, and an inner chamber is formed in the driving mechanism. The edge of the elastic diaphragm 11 is in sealed sliding connection with the side wall of the inner chamber of the driving mechanism. A plurality of elastic members 14 are arranged in the inner chamber of the driving mechanism. The top and bottom of the elastic members 14 are fixedly connected with the bottom surface of the elastic diaphragm 11 and the bottom surface of the inner chamber of the driving mechanism, respectively. When the upper chamber 12 of the driving mechanism is supplied with pressure, the elastic diaphragm 11 can compress the elastic members 14 and move towards the first direction under the action of the gas pressure of the upper chamber 12, and the driving terminal valve 21 is closed. Conversely, when the upper chamber 12 of the driving mechanism is depressurized, the pressure difference between the upper chamber 12 and the lower chamber 13 gradually decreases, the elastic diaphragm 11 moves towards the direction opposite to the first direction due to the relaxation of the elastic members 14, and the driving terminal valve is opened. In another embodiment, the connection mode of the elastic diaphragm 11 and the inner chamber of the driving mechanism can also be that the edge of the elastic diaphragm 11 is fixedly connected with the midpoint position of the side wall of the inner chamber of the driving mechanism. The elastic diaphragm 11 is made of a material with elasticity. When the gas pressure of the upper chamber 12 increases, the elastic diaphragm 11 can also overcome the elastic force of the elastic members 14 and move towards the first direction. Conversely, when the gas pressure of the upper chamber 12 decreases, the elastic diaphragm 11 also bears the elastic force of the elastic members 14 and moves towards the direction opposite to the first direction.

[0047] Preferably, in the embodiment, the upper membrane cover 9 is provided with a vent hole 15, and a gas exhaust valve 8 is arranged in the gas path system. The vent hole 15 is in sealed connection with the gas outlet of the holding valve 7 and the gas inlet of the gas exhaust valve 8, respectively. When the gas source is interrupted, the holding valve 7 is turned off, and the upper chamber 12 of the driving mechanism maintains a high pressure state. The high-pressure gas in the upper chamber 12 of the driving mechanism can be released by manually opening the gas exhaust valve 8.

[0048] Further, in the embodiment, the bottom of the lower membrane cover 10 is provided with a guide hole 16, and a transmission shaft 17 is arranged to pass through the guide hole 16. The top of the transmission shaft 17 is fixedly connected with the bottom surface of the elastic diaphragm 11, and the bottom of the transmission shaft 17 is fixedly connected with the driving part of the terminal valve 21. When the elastic diaphragm 11 moves in the first direction, the transmission shaft 17 moves synchronously, thereby controlling the opening range of the terminal valve 21. The specific structure of the terminal valve 21 is not limited in the embodiment, and the terminal valve 21 only needs to satisfy the two working states of opening and closing.

[0049] Further, in the embodiment, the driving mechanism is further provided with a hand wheel assembly, which includes a shaft body shell 18, a rotating shaft 19 and a hand wheel body 20. The top of the upper membrane cover 9 is further provided with a rotating shaft 19 through hole. The bottom of the shaft body shell 18 is sealingly fixed with the top edge of the rotating shaft 19 through hole. The inside of the shaft body shell 18 is provided with an internal cavity extending in the first direction. The internal cavity is provided with an internal thread. The outer surface of the rotating shaft 19 is provided with an external thread matched with the internal thread of the shaft body shell 18, so that the internal cavity of the shaft body shell 18 and the rotating shaft 19 can be sealingly threadedly connected. The top of the rotating shaft 19 is fixedly connected with the hand wheel body 20.

[0050] In the embodiment, when the gas source is disconnected, if the opening range of the terminal valve 21 needs to be manually controlled, the exhaust valve 8 can be first opened to release the high-pressure gas in the upper chamber 12 of the driving mechanism. After the gas pressure in the upper chamber 12 and the lower chamber 13 of the driving mechanism is balanced, the hand wheel body 20 can be manually rotated to drive the rotating shaft 19 to move in the first direction. When the rotating shaft 19 moves in 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, thereby driving the elastic diaphragm 11 to move in the first direction and controlling the closing of the terminal valve 21. Conversely, when the rotating shaft 19 moves in the direction opposite to the first direction, the elastic diaphragm 11 moves in the direction opposite to the first direction due to the expansion of the elastic member 14, thereby controlling the opening of the terminal valve 21.

[0051] Preferably, in the embodiment, an electromagnetic sensor is arranged in the terminal valve, and the electromagnetic sensor is electrically connected with 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 arranged on the terminal valve changes relative to the electromagnetic sensor, thereby causing the change of the magnetic field intensity. The electromagnetic sensor detects the real-time change of the magnetic field to determine the real-time opening range of the terminal valve 21, thereby facilitating the valve control device to more accurately and visually control the terminal valve 21.

[0052] Preferably, in the embodiment, the positioner 3 is electrically connected with the central control device, and the central control device can realize manual control of the gas output rate of the positioner 3, so as to meet the requirement of remote and accurate control of the opening range of the terminal valve 21.

[0053] Preferably, in the embodiment, the gas path 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 sealingly connected with the gas outlet of the filter 1, the second pipe opening of the four-way valve 5 is sealingly connected with the gas inlet of the electromagnetic valve 2, the third pipe opening of the four-way valve 5 is sealingly connected with the signal gas opening of the position valve 7, the fourth pipe opening of the four-way valve 5 is sealingly connected with the first pipe opening of the three-way valve 6, the second pipe opening of the three-way valve 6 is sealingly connected with the gas inlet of the positioner 3, and the third pipe opening of the three-way valve 6 is sealingly connected with the second gas inlet of the gas control valve 4. Through cooperation of the four-way valve 5 and the three-way valve 6, the first gas path, the second gas path, the third gas path and the fourth gas path are formed, so as to ensure that when the gas source normally supplies gas, the gas output by the filter 1 can be fully circulated through the gas paths.

[0054] Second embodiment

[0055] Based on the same concept, the application further provides a valve control method applied to the valve control device in any one of the first embodiments, referring to Figure 5 , and comprising the following steps:

[0056] S1: If the gas source normally supplies gas and the power supply normally supplies power, the electromagnetic valve 2 is turned on, the positioner 3 works, the first gas inlet of the gas control valve 4 is opened, the second gas inlet of the gas control valve 4 is closed, and the position 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 through the central control device, so as to control the moving range of the elastic diaphragm 11 in the first direction, and indirectly control the opening range of the terminal valve 21.

[0057] S2: If the gas source normally supplies gas but the power supply loses power, the electromagnetic valve 2 is automatically turned off, the positioner 3 is powered off, the first gas inlet of the gas control valve 4 is closed, the second gas inlet of the gas control valve 4 is opened, and the position valve 7 remains turned on. The gas is continuously supplied to the upper chamber 12 of the driving mechanism through the third gas path. The elastic diaphragm 11 continuously moves in the first direction until the terminal valve 21 is completely closed, so as to realize the automatic emergency closing function of the terminal valve 21 when the power supply loses power, and quickly cut off the medium supply in the production line.

[0058] S21: After the terminal valve 21 is closed in emergency, if manual intervention is needed to realize manual control of the terminal valve 21, the gas supply of the gas source is first cut off, the exhaust valve 8 is turned on, the high-pressure gas in the upper chamber 12 of the driving mechanism is released, after the upper chamber 12 and the lower chamber 13 of the driving mechanism are balanced in pressure, the hand wheel body 20 is rotated, and the opening range of the terminal valve 21 is manually controlled.

[0059] S3: If the special situation of gas source breaking occurs, the position maintaining valve 7 automatically closes, the existing pressure in the upper chamber 12 of the driving mechanism is maintained, the elastic diaphragm 11 maintains the position before the gas source breaks, the terminal valve 21 is driven to maintain the opening range before the gas source breaks, the terminal valve 21 is maintained stable, and the medium in the production line pipeline is ensured to continue to circulate according to the original transmission rate.

[0060] S31: After the gas source breaks, if manual intervention is needed to realize manual control of the terminal valve 21, first, the exhaust valve 8 is turned on, the high-pressure gas in the upper chamber 12 of the driving mechanism is released, after the upper chamber 12 and the lower chamber 13 of the driving mechanism are balanced in pressure, the hand wheel body 20 is rotated, and the opening range of the terminal valve 21 is manually controlled.

[0061] In summary, the embodiment provides a valve control method, based on gas circuit control design, when the special situation of power failure and gas source breaking occurs, the emergency closing and position maintaining control function of the terminal valve 21 can be automatically realized, the safety of on-site operation and production is effectively guaranteed, the production efficiency is improved, and fault maintenance is facilitated.

[0062] The embodiments of the application are described in detail above with reference to the accompanying drawings, but the application is not limited to the above-described embodiments. Even if various changes are made to the application, if the changes fall within the scope of the claims of the application and equivalent technologies thereof, they still fall within the protection scope of the application.

[0063] It should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second", and the like are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second", and the like can explicitly or implicitly include one or more features. In the description of the application, unless otherwise specified, the meaning of "a plurality of" is 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 within the driving mechanism, the elastic diaphragm divides the chamber within the driving mechanism into an upper chamber and a lower chamber that are sealed and isolated, and the elastic diaphragm is in driving connection with the terminal valve. 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; When the air pressure in the upper chamber is greater than a preset opening pressure, the elastic diaphragm moves toward the first direction, driving 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 the 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, thereby forming 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, and the air outlet of the air control valve is connected to the upper chamber of the driving mechanism, thereby forming 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 gas inlet and the second gas inlet of the gas-controlled valve to achieve interlocked opening and closing based on the open and closed state of the solenoid valve. When only the second gas circuit is open and gas is supplied, the gas output of the gas-controlled valve is controlled by the positioner to thereby adjust the opening amplitude of the terminal valve. When only the third gas circuit is open and gas is supplied, the terminal valve is driven to close. The air circuit system is further provided with a retaining valve, the fourth air outlet of the filter is connected to the signal air port of the retaining valve to form a fourth air circuit; the air outlet of the air control valve is connected to the air inlet of the retaining valve, and the air outlet of the retaining valve is connected to the upper chamber of the driving mechanism; The retaining valve is configured such that when there is gas supplied in the fourth gas path, the retaining valve is turned on, and the second gas path or the third gas path supplies pressure to the upper chamber of the driving mechanism through the retaining valve; when there is no gas supplied in the fourth gas path, the retaining valve is turned off, and the existing gas pressure is maintained in the upper chamber of the driving mechanism.

2. The valve control device according to claim 1, characterized in that: The driving mechanism includes 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 diaphragm is sealingly and slidingly 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 diaphragm 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 part to move toward a first direction, 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 part, moves toward a direction opposite to the first direction, driving the terminal valve to open.

3. The valve control device according to claim 2, characterized in that: A vent is provided on the top of the upper membrane cover, and the air circuit system is also provided with an exhaust valve. The vent 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.

4. The valve control device according to claim 2, characterized in that: A guide hole is provided at the bottom of the lower diaphragm 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.

5. The valve control device according to claim 2, wherein: The driving mechanism is further provided with a handwheel assembly, which includes 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. An inner cavity is provided inside the shaft housing that passes through in a first direction. 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 stretches due to the elastic member and moves in a direction opposite to the first direction.

6. The valve control device according to claim 1, wherein: 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.

7. The valve control device according to claim 1, wherein: 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.

8. The valve control device according to claim 1, wherein: 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.

9. A valve control method, characterized in that: The valve control device according to any one of claims 1 to 8 comprises the following steps: S1: If the gas source is supplying gas and the power supply is on, the solenoid valve is turned on, the positioner is working, 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. Gas is supplied to the upper chamber of the driving mechanism through the second air path. The gas output rate of the positioner is adjusted by the central control device to control the movement range of the elastic diaphragm in the first direction, thereby indirectly controlling the opening range 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. Gas is continuously supplied to the upper chamber of the driving mechanism through the third air path, controlling the elastic diaphragm to move in the first direction, and driving the terminal valve to be completely closed; S21: After the terminal valve is urgently closed, if manual control is required, the gas supply is cut off, the exhaust valve is opened, and after the air pressure in the upper chamber and the lower chamber of the driving mechanism is balanced, the handwheel body is rotated to manually control the opening range 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 handwheel body is rotated to manually control the opening range of the terminal valve.

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