CN110805739A - Anti-blocking method and device for intelligent valve positioner I/P unit, storage medium and electronic terminal - Google Patents
Anti-blocking method and device for intelligent valve positioner I/P unit, storage medium and electronic terminal Download PDFInfo
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- CN110805739A CN110805739A CN201910989525.5A CN201910989525A CN110805739A CN 110805739 A CN110805739 A CN 110805739A CN 201910989525 A CN201910989525 A CN 201910989525A CN 110805739 A CN110805739 A CN 110805739A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/126—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like
- F16K31/1262—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like one side of the diaphragm being spring loaded
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Abstract
The invention discloses an anti-blocking method for an I/P unit of an intelligent valve positioner, which comprises the following steps: monitoring the state of the valve position, and judging whether the valve position is in a static state; if the valve position is in a static state, judging the time when the valve position is in the static state; and if the time of the valve position in the static state exceeds the set time, controlling the I/P unit to perform anti-blocking treatment. When the valve is monitored to be in a static position-keeping state for a long time, air intake or exhaust operation is not carried out, one or more times of air intake and exhaust operation can be carried out by forcibly using PWM small pulses, a small amount of accumulated impurities are discharged to the outside of the positioner by utilizing air intake and exhaust, more impurities do not need to be accumulated in the I/P unit, and the air intake and exhaust paths of the I/P unit are ensured to be smooth.
Description
Technical Field
The invention relates to the field of valves, in particular to an anti-blocking method and device for an I/P unit of an intelligent valve positioner.
Background
The intelligent valve positioner is a field control instrument widely applied to the fields of petrochemical industry and the like, is a main accessory of a regulating valve, is usually matched with a pneumatic regulating valve for use, and has the main function of receiving a control command from a central control unit and accurately controlling the opening of the valve.
The intelligent valve positioner 1 is used for controlling the opening of a valve in a closed-loop control mode, as shown in figure 1, the intelligent valve positioner mainly comprises a sensor, a main board, an I/P unit and the like, the sensor is mainly used for measuring the position of a valve rod 3 in real time and sending measured data to the main board for collection; the main board is mainly used for acquiring data of the valve position sensor and control command data of central control through the AD module, converting the data of the valve position sensor and the control command data of the central control into percentages, and determining whether the I/P unit needs air inlet or air exhaust by comparing the percentage of the valve position sensor with the percentage of the command; the function of the I/P unit is mainly to control the air intake or exhaust of the actuator. When air is fed or exhausted from the inside of the actuating mechanism 2, the valve rod is pushed to move downwards or upwards, the opening degree of the valve is reduced or increased, meanwhile, the valve position sensor monitors the movement of the valve rod, and data can be changed.
The I/P unit is an execution unit for air intake or exhaust of the intelligent valve positioner, and generally has two piezoelectric valves inside, wherein one piezoelectric valve controls air intake, and the other piezoelectric valve controls exhaust, and the two piezoelectric valves are directly controlled by a main board CPU. A very important problem of the intelligent valve positioner in the actual use process is to ensure that the I/P unit cannot be blocked, if the blockage phenomenon occurs, the I/P unit cannot control air inlet or air exhaust of the cylinder, and the valve cannot act, but in practice, compressed air supplied to the intelligent valve positioner contains more or less impurities, such as moisture, oil stain, small solid impurities and the like, and if the valve is in a static state for a long time, the impurities are easily accumulated in the I/P unit to cause the blockage of the I/P unit.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide an anti-jam method and apparatus for an I/P unit of a smart valve positioner, which solves the shortcomings of the prior art.
To achieve the above and other related objects, the present invention provides an anti-jamming method for an intelligent valve positioner I/P unit, the method comprising:
monitoring the state of the valve position, and judging whether the valve position is in a static state;
if the valve position is in a static state, judging the time when the valve position is in the static state;
and if the time of the valve position in the static state exceeds the set time, controlling the I/P unit to perform anti-blocking treatment.
Optionally, the I/P unit is controlled by a PWM wave to perform anti-blocking processing.
Optionally, the anti-blocking treatment is performed in the following manner: and repeating the steps of air intake and air exhaust.
Optionally, in the air intake process, firstly, air is supplied to the cylinder for a set time period, and then the valve position is in a static state for a set time period; in the exhaust process, the cylinder is firstly exhausted for a set time length, and then the valve position is in a static state for a set time length.
To achieve the above and other related objects, the present invention provides an anti-clogging device of an I/P unit of a smart valve positioner, the device comprising:
the valve position monitoring module is used for monitoring the state of the valve position and judging whether the valve position is in a static state;
the time monitoring module is used for judging the time of the valve position in the static state when the valve position is in the static state;
and the anti-blocking control module is used for controlling the I/P unit to perform anti-blocking treatment when the time of the valve position in the static state exceeds the set time.
Optionally, the anti-blocking control module controls the I/P unit to perform anti-blocking processing through a PWM wave.
Optionally, the anti-blocking treatment is performed in the following manner: and repeating the steps of air intake and air exhaust.
Optionally, in the air intake process, firstly, air is supplied to the cylinder for a set time period, and then the valve position is in a static state for a set time period; in the exhaust process, the cylinder is firstly exhausted for a set time length, and then the valve position is in a static state for a set time length.
To achieve the above and other related objects, the present invention provides a storage medium storing a computer program which, when executed by a processor, performs the method.
To achieve the above and other related objects, the present invention provides an electronic terminal, comprising: a processor and a memory;
the memory is used for storing computer programs, and the processor is used for executing the computer programs stored by the memory so as to enable the terminal to execute the method.
As mentioned above, the anti-blocking method and device for the I/P unit of the intelligent valve positioner have the following beneficial effects:
when the valve is monitored to be in a static position-keeping state for a long time, air intake or exhaust operation is not carried out, one or more times of air intake and exhaust operation can be carried out by forcibly using PWM small pulses, a small amount of accumulated impurities are discharged to the outside of the positioner by utilizing air intake and exhaust, more impurities do not need to be accumulated in the I/P unit, and the air intake and exhaust paths of the I/P unit are ensured to be smooth.
Drawings
FIG. 1 is a schematic view of a regulator valve configuration;
FIG. 2 is a flow chart illustrating a method for preventing clogging of an I/P unit of a smart valve positioner according to an embodiment of the present invention;
FIG. 3 is a block diagram of an anti-clog device of an intelligent valve positioner I/P unit in accordance with an embodiment of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
As shown in fig. 2, a method for preventing clogging of an I/P unit of a smart valve positioner, the method comprising:
s11 monitoring the state of the valve position, and judging whether the valve position is in a static state;
s12, if the valve position is in the static state, judging the time when the valve position is in the static state;
and S13, if the time of the valve position in the static state exceeds the set time, controlling the I/P unit to perform anti-blocking treatment.
Wherein, the mode of anti-blocking treatment is as follows: and controlling the I/P unit to perform anti-blocking treatment through the PWM wave.
When the valve is monitored to be in a static position-keeping state for a long time, air intake or exhaust operation is not carried out, one or more times of air intake and exhaust operation can be carried out by forcibly using PWM small pulses, a small amount of accumulated impurities are discharged to the outside of the positioner by utilizing air intake and exhaust, more impurities do not need to be accumulated in the I/P unit, and the air intake and exhaust paths of the I/P unit are ensured to be smooth.
In some embodiments, the anti-blocking treatment is performed by: and repeating the steps of air intake and air exhaust.
In some embodiments, during air inlet, air is firstly fed into the cylinder for a set time period, and then the valve position is in a static state for a set time period; in the exhaust process, the cylinder is firstly exhausted for a set time length, and then the valve position is in a static state for a set time length.
Specifically, the anti-blocking treatment step includes: the I/P unit intake piezoelectric valve is first opened to intake air to the cylinder for a set time (e.g., 30ms to 100ms in some embodiments), held (with the valve position in a static state) for a set time (e.g., 20ms to 100ms in some embodiments), continuously intake air for a set number of times (which may be selected according to actual needs, e.g., 10 times in some embodiments), then closed to open the exhaust piezoelectric valve to exhaust air to the cylinder for a set time (e.g., 30ms to 100ms in some embodiments), secured (with the valve position in a static state) for a set time (e.g., 20ms to 100ms in some embodiments), continuously exhaust air for a set number of times (which may be selected according to actual needs, for example, in some embodiments, 10 selections).
In some embodiments, a method of anti-jamming of a smart valve positioner I/P unit, the method comprising:
1. entering a main () function;
2. initializing the CPU (EFM32LG series), setting variable parameters, and the like;
3. entering a dead cycle;
4. judging whether the valve position is in a protection state (static state), and if the valve position is in the protection state, setting a ValveHoldflag variable; otherwise, the ValveHoldflag variable is reset; wherein ValveHoldcount is a accumulated count of valve position holding, and is a long integer variable unsegned long.
5. Judging a ValveHoldFlag flag (the ValveHoldFlag is a valve position guard state flag and is a character-type variable unsigned char) in a 100ms timer interrupt service function, and if the ValveHoldFlag flag is set, adding 1 to a valve position guard accumulated count ValveHoldCount; otherwise, resetting the valve position keeping accumulated count ValveHoldcount; if the valve hold count value reaches the time of day, namely 10 × 60 × 24, it indicates that the valve position is not actuated during the time of day, the valve position anti-blocking processing flag is set, and the valve position hold cumulative count value is reset. Wherein, ValveIProcessFlag is a valve position anti-blocking processing mark and is a character type variable unsigned char.
6. If the valve position anti-blocking processing flag ValveIPprocessFlag is not set, the anti-blocking processing is not carried out, and the next step is continued; if the valve position anti-blocking processing flag ValveIProcessFlag is set, valve position anti-blocking processing needs to be carried out. Wherein, the valve position anti-blocking treatment specifically comprises the following steps:
the method comprises the steps of firstly opening an I/P unit air inlet piezoelectric valve, feeding air into an air cylinder for 30-100 ms each time, keeping the air cylinder for 20-100 ms, continuously feeding air and keeping the air cylinder for 10 times, then closing the air inlet piezoelectric valve, opening an exhaust piezoelectric valve, discharging air into the air cylinder for 30-100 ms each time, keeping the air cylinder for 20-100 ms, continuously discharging air and keeping the air cylinder for 10 times, and resetting a valve position anti-blocking processing mark ValveeIPProcessFlag.
As shown in fig. 3, an anti-clogging device of an intelligent valve positioner I/P unit, the device comprising:
the valve position monitoring module 11 is used for monitoring the state of the valve position and judging whether the valve position is in a static state;
the time monitoring module 12 is used for judging the time when the valve position is in the static state;
and the anti-blocking control module 13 is used for controlling the I/P unit to perform anti-blocking treatment when the time that the valve position is in the static state exceeds the set time.
In some embodiments, the anti-blocking control module controls the I/P unit to perform anti-blocking processing through a PWM wave.
In some embodiments, the anti-blocking treatment is performed by: and repeating the steps of air intake and air exhaust.
In some embodiments, during air inlet, air is firstly fed into the cylinder for a set time period, and then the valve position is in a static state for a set time period; in the exhaust process, the cylinder is firstly exhausted for a set time length, and then the valve position is in a static state for a set time length.
Specifically, the anti-blocking treatment step includes: firstly, the I/P unit air inlet piezoelectric valve is opened to charge air into the cylinder, each time the air inlet piezoelectric valve is charged for a set time (for example, 30-100 ms is selected in some embodiments), the valve position is kept (the valve position is in a static state) for a set time (for example, 20-100 ms is selected in some embodiments), the air inlet piezoelectric valve is continuously charged and kept for a certain number of times (for example, 10 times is selected in some embodiments), and then closing the air inlet piezoelectric valve, opening the air outlet piezoelectric valve, exhausting the air for the air cylinder, exhausting for a set time (for example, 30-100 ms is selected in some embodiments) each time, guarding (making the valve position in a static state) for a set time (for example, 20-100 ms is selected in some embodiments), continuously exhausting and keeping for a certain number of times (the set number of times can be selected according to actual needs, for example, 10 times is selected in some embodiments).
Since the embodiment of the apparatus portion and the embodiment of the method portion correspond to each other, please refer to the description of the embodiment of the method portion for the content of the embodiment of the apparatus portion, which is not repeated here.
In some embodiments, an anti-clogging device of an intelligent valve positioner I/P unit, the device comprising: the system comprises a main program module, a timed interruption service module, an initialization module, a valve position monitoring module, an anti-blocking algorithm module and the like.
The main program module is mainly used for controlling each task of the scheduling system, so that the system can work normally.
The timer interrupt service module is used for monitoring the time that the valve position is in the holding state (static state) at the timing of 100 ms.
The initialization module is mainly used for initializing the CPU, the related peripheral modules, system variable parameters and the like.
The valve position monitoring module is mainly used for monitoring the state of the valve position and judging whether the valve position is in a static state or not for a long time.
The anti-blocking algorithm module is mainly used for sending out PWM (pulse-width modulation) small pulses and controlling the I/P unit to intake air or exhaust air so as to prevent the I/P unit from being blocked.
The following variable units are defined:
the long integer variable unsettled ValveHoldcount is the accumulated count of the valve position holding;
a character type variable unscigned char ValveHoldFlag is a valve position guard state mark;
a character type variable unscented char ValveiPProcessflag is a valve position anti-blocking processing mark;
the specific working process of the system is as follows:
1. powering on and starting up the system, and entering a main () function;
2. calling an initialization module, and initializing a CPU, a timer interrupt service module, a related peripheral module, system variable parameters and the like;
3. entering a dead cycle;
4. calling a valve position monitoring module, judging whether the valve position is in a protection state, and if the valve position is in the protection state, setting a ValveHoldflag variable; otherwise, the ValveHoldflag variable is reset;
5. judging a ValveHoldFlag flag in a 100ms timer interrupt service function, and if the ValveHoldFlag flag is set, adding 1 to a valve position hold accumulated count ValveHoldCount; otherwise, resetting the valve position keeping accumulated count ValveHoldcount; if the valve hold count value reaches the time of day, namely 10 × 60 × 24, it indicates that the valve position is not actuated during the time of day, the valve position anti-blocking processing flag is set, and the valve position hold cumulative count value is reset.
6. If the valve position anti-blocking processing flag ValveIPprocessFlag is not set, the anti-blocking processing is not carried out, and the next step is continued; if the valve position anti-blocking processing flag ValveePProcessflag is set, valve position anti-blocking processing needs to be carried out, the air inlet piezoelectric valve of the I/P unit is opened firstly, air is fed into the air cylinder for 30-100 ms each time, the position is maintained for 20-100 ms, air is continuously fed and maintained for 10 times, then the air inlet piezoelectric valve is closed, the exhaust piezoelectric valve is opened, air is discharged into the air cylinder for 30-100 ms each time, the position is maintained for 20-100 ms, air is continuously discharged and maintained for 10 times, and the valve position anti-blocking processing flag ValveePProcessflag is reset.
7. And continuously operating other functional modules.
When the valve is monitored to be in a static position-keeping state for a long time, air intake or exhaust operation is not carried out, one or more times of air intake and exhaust operation can be carried out by forcibly using PWM small pulses, a small amount of accumulated impurities are discharged to the outside of the positioner by utilizing air intake and exhaust, more impurities do not need to be accumulated in the I/P unit, and the air intake and exhaust paths of the I/P unit are ensured to be smooth.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may comprise any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a Random Access Memory (RAM), an electrical carrier signal, a telecommunications signal, a software distribution medium, etc.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. An anti-clogging method of an intelligent valve positioner (I/P) unit, the method comprising:
monitoring the state of the valve position, and judging whether the valve position is in a static state;
if the valve position is in a static state, judging the time when the valve position is in the static state;
and if the time of the valve position in the static state exceeds the set time, controlling the I/P unit to perform anti-blocking treatment.
2. The anti-clogging method for the intelligent valve positioner I/P unit according to claim 1, characterized in that the anti-clogging treatment is performed by controlling the I/P unit through PWM waves.
3. The anti-clogging method for the intelligent valve positioner I/P unit according to claim 1 or 2, characterized in that the anti-clogging treatment is carried out in a mode of: and repeating the steps of air intake and air exhaust.
4. The anti-clogging method of the intelligent valve positioner I/P unit according to claim 3, characterized in that in the air intake process, the air is firstly supplied to the cylinder for a set time period, and then the valve position is in a static state for a set time period; in the exhaust process, the cylinder is firstly exhausted for a set time length, and then the valve position is in a static state for a set time length.
5. An anti-clogging device for an intelligent valve positioner (I/P) unit, the device comprising:
the valve position monitoring module is used for monitoring the state of the valve position and judging whether the valve position is in a static state;
the time monitoring module is used for judging the time of the valve position in the static state when the valve position is in the static state;
and the anti-blocking control module is used for controlling the I/P unit to perform anti-blocking treatment when the time of the valve position in the static state exceeds the set time.
6. The anti-blocking device of the intelligent valve positioner I/P unit according to claim 5, wherein the anti-blocking control module controls the I/P unit to perform anti-blocking treatment through PWM waves.
7. The anti-clogging device of the intelligent valve positioner I/P unit according to claim 5 or 6, characterized in that the anti-clogging treatment is carried out in the following way: and repeating the steps of air intake and air exhaust.
8. The anti-clogging device of the intelligent valve positioner I/P unit according to claim 7, characterized in that in the air inlet process, the air inlet is firstly given for a set time period, and then the valve position is in a static state for a set time period; in the exhaust process, the cylinder is firstly exhausted for a set time length, and then the valve position is in a static state for a set time length.
9. A storage medium storing a computer program, characterized in that the computer program, when executed by a processor, performs the method according to any one of claims 1 to 4.
10. An electronic terminal, comprising: a processor and a memory;
the memory is for storing a computer program and the processor is for executing the computer program stored by the memory to cause the terminal to perform the method of any of claims 1 to 4.
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| CN201910989525.5A CN110805739A (en) | 2019-10-17 | 2019-10-17 | Anti-blocking method and device for intelligent valve positioner I/P unit, storage medium and electronic terminal |
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| CN201910989525.5A CN110805739A (en) | 2019-10-17 | 2019-10-17 | Anti-blocking method and device for intelligent valve positioner I/P unit, storage medium and electronic terminal |
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| CN109058547A (en) * | 2018-08-13 | 2018-12-21 | 珠海格力电器股份有限公司 | A kind of solenoid valve and its control method and water purifier with mudhole cleaning device |
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