CN114060603B - Fault judging method of regulating valve - Google Patents
Fault judging method of regulating valve Download PDFInfo
- Publication number
- CN114060603B CN114060603B CN202111443703.8A CN202111443703A CN114060603B CN 114060603 B CN114060603 B CN 114060603B CN 202111443703 A CN202111443703 A CN 202111443703A CN 114060603 B CN114060603 B CN 114060603B
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- main board
- fault
- regulating valve
- voltage
- air source
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000001276 controlling effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
Classifications
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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
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
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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
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0083—For recording or indicating the functioning of a valve in combination with test equipment by measuring valve parameters
-
- 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
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Testing And Monitoring For Control Systems (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
Abstract
A fault judging method of a regulating valve comprises the following steps: 1) Setting a dead zone threshold value, an air source pressure threshold value, a main board voltage maximum threshold value and a main board voltage minimum threshold value of the regulating valve; 2) If the difference value between the target opening of the regulating valve and the real-time opening of the regulating valve is not in the dead zone threshold range of the regulating valve, judging the air source fault; 3) Judging air source faults: if the real-time air source pressure is within the air source pressure threshold range, judging a main board fault; 4) Judging the fault of the main board: setting the I/P driving voltage of the main board as a high level, and setting the I/P driving voltage of the main board as a low level if the real-time I/P driving voltage is larger than the maximum threshold value of the main board voltage; if the real-time I/P driving voltage is smaller than the minimum threshold value of the main board voltage, judging the fault of the I/P unit; 5) I/P unit fault judgment: and the main board I/P driving voltage is respectively and sequentially set as exhaust voltage, holding voltage and air inlet voltage, and if the valve can enter a corresponding exhaust state/holding state/air inlet state, the fault of the regulating valve is caused by the gas circuit fault.
Description
Technical Field
The invention relates to the field of regulating valves, in particular to a fault judging method of a regulating valve.
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 functions of receiving a control command from a central control and accurately controlling the opening of the valve.
The intelligent valve positioner is an intelligent process control instrument which is based on a microprocessor technology and adopts a digital technology to perform data processing, decision generation and two-way communication, does not need manual adjustment, can automatically detect zero point, full range and friction coefficient of a regulating valve, and automatically sets control parameters.
The intelligent valve positioner controls the opening of the valve in a closed loop manner, as shown in figure 1, and mainly comprises a sensor, a main board, an I/P unit containing an I/P converter and the like, wherein the sensor mainly measures the position of a valve rod in real time and sends measured data to the main board for acquisition; the main board mainly collects data of the valve position sensor and control command data of the central control through the AD module, converts the data into percentages, and determines whether the I/P unit needs to be charged or discharged by comparing the percentages of the valve position sensor with the target percentages, wherein a key module, a display module, a valve position feedback module and the like are generally arranged on the main board; the I/P unit mainly controls the air intake or the air exhaust of the actuating mechanism. When the air is introduced or exhausted from the actuating mechanism, the valve rod is pushed to move downwards or upwards, the opening of the valve is reduced or increased, and meanwhile, the valve position sensor monitors the movement of the valve rod and the data are changed.
Because the intelligent valve positioner is an electromechanical integrated intelligent control instrument, the microprocessor controls the IP unit to perform air intake or air exhaust through an electric signal, air pressure is conducted into the cylinder of the actuating mechanism through a pipeline, and the actuating mechanism pushes the valve to move through the valve rod. In practical application, when the intelligent valve positioner works on site, faults such as air source faults, main board faults, I/P unit faults, air path faults and the like which influence the normal operation of the regulating valve may occur: if the working environment of the intelligent valve positioner is bad, the control of the regulating valve is possibly caused by high temperature, low temperature, corrosive gas, electrostatic interference and the like; the control of the regulating valve is problematic due to the fact that moisture, greasy dirt and impurities possibly exist in the air source, and even the control of the regulating valve is problematic due to pulse interference of a power supply part, unstable power supply (unstable voltage and current) and the like, but an operator can hardly accurately judge the fault cause causing the control of the regulating valve to be problematic.
Disclosure of Invention
Aiming at the corresponding defects of the prior art, the invention provides a fault judging method of an adjusting valve, aiming at the fault types which can influence the normal operation of the adjusting valve, such as air source faults, main board faults, I/P unit faults, air path faults and the like, which possibly exist in the on-site operation of an intelligent valve positioner, the fault types are intelligently identified through a software algorithm, and operators are prompted to remove the corresponding faults or replace the corresponding parts.
The invention is realized by adopting the following scheme: a fault judging method of a regulating valve comprises the following steps:
1) Setting a dead zone threshold value of the regulating valve, an air source pressure threshold value and a main board voltage threshold value;
2) If the difference value between the target opening of the regulating valve and the real-time opening of the regulating valve is not in the dead zone threshold range of the regulating valve, judging the air source fault;
3) Judging air source faults: if the real-time air source pressure is not within the air source pressure threshold range, judging that the fault source of the regulating valve is an air source fault, and if the real-time air source pressure is within the air source pressure threshold range, judging that the main board is faulty;
4) Adopting a stoping circuit to stope real-time I/P driving voltage through AD and judging the fault of the main board according to the following method:
setting the I/P driving voltage of the main board as a high level, judging that the fault of the regulating valve is caused by the main board fault if the real-time I/P driving voltage is not greater than the maximum threshold value of the main board voltage, and setting the I/P driving voltage of the main board as a low level if the real-time I/P driving voltage is greater than the maximum threshold value of the main board voltage;
if the real-time I/P driving voltage is not smaller than the minimum threshold value of the main board voltage, judging that the fault of the regulating valve is caused by the main board fault, and if the real-time I/P driving voltage is smaller than the minimum threshold value of the main board voltage, judging the fault of the I/P unit;
5) I/P unit fault judgment:
and the main board I/P driving voltage is respectively and sequentially set as exhaust voltage, holding voltage and air inlet voltage, if the valve can enter the corresponding exhaust state/holding state/air inlet state, the failure cause of the regulating valve is judged to be an air path failure, otherwise, the failure cause of the regulating valve is judged to be an I/P unit failure.
Preferably, the air source pressure threshold value comprises an air source pressure maximum threshold value and an air source pressure minimum threshold value.
Preferably, in step 2), a time threshold is set, and if the duration of the difference between the target opening of the regulating valve and the real-time opening of the regulating valve, which is not within the dead zone threshold range of the regulating valve, is greater than the time threshold, then air source fault judgment is performed.
The invention has the following beneficial effects: when the regulating valve for controlling the valve opening by adopting the intelligent valve positioner works, the faults such as air source fault, main board fault, I/P unit fault, air path fault and the like are accurately judged.
Drawings
FIG. 1 is a schematic diagram of a regulating valve for controlling the opening of a valve by an intelligent valve positioner;
fig. 2 is a flow chart of the present invention.
Detailed Description
As shown in fig. 2, a fault judging method of a regulating valve includes the following steps:
1) Setting a dead zone threshold value of the regulating valve, an air source pressure threshold value and a main board voltage threshold value;
2) If the difference value between the target opening of the regulating valve and the real-time opening of the regulating valve is not in the dead zone threshold range of the regulating valve, judging the air source fault;
in this embodiment, a time threshold is set in step 2), and if the duration of the difference between the target opening of the regulating valve and the real-time opening of the regulating valve, which is not within the dead zone threshold range of the regulating valve, is greater than the time threshold, the air source fault is judged, where the time threshold is an empirical value, or the full stroke time of the opening and closing of the valve is automatically measured during self-checking of the intelligent valve positioner.
The target opening of the regulating valve is obtained by collecting a voltage input signal for controlling the opening of the regulating valve in the intelligent valve positioner through an AD (analog-to-digital) converter and is converted into a corresponding percentage;
the real-time opening of the regulating valve is obtained by collecting valve position signals of a valve position sensor in the intelligent valve positioner through AD, and the valve position signals are converted into corresponding percentages.
3) Judging air source faults: if the real-time air source pressure is not within the air source pressure threshold range, judging that the fault source of the regulating valve is an air source fault, and if the real-time air source pressure is within the air source pressure threshold range, judging that the main board is faulty;
in this embodiment, the air source pressure threshold includes an air source pressure maximum threshold and an air source pressure minimum threshold.
And after the MCU in the intelligent valve positioner collects data and filters through the air source pressure sensor, calculating the real-time air source pressure, and if the real-time air source pressure is larger than the maximum air source pressure threshold or smaller than the minimum air source pressure threshold, obtaining that the regulating valve fault is an air source fault.
4) Adopting a stoping circuit to stope real-time I/P driving voltage through AD and judging the fault of the main board according to the following method:
setting the I/P driving voltage of the main board as a high level, judging that the fault of the regulating valve is caused by the main board fault if the real-time I/P driving voltage is not greater than the maximum threshold value of the main board voltage, and setting the I/P driving voltage of the main board as a low level if the real-time I/P driving voltage is greater than the maximum threshold value of the main board voltage;
if the real-time I/P driving voltage is not smaller than the minimum threshold value of the main board voltage, judging that the fault of the regulating valve is caused by the main board fault, and if the real-time I/P driving voltage is smaller than the minimum threshold value of the main board voltage, judging the fault of the I/P unit;
in this embodiment, the maximum threshold of the motherboard voltage is 24V, and the minimum threshold of the motherboard voltage is 3V;
the MCU in the intelligent valve positioner is used for setting the output voltages of 4 output ports of the I/P driving voltage of the main board to be high level, after the level is ensured to be stable for 20ms, the real-time I/P driving voltage is stoped by the stoping circuit through AD, and if the real-time I/P driving voltage is not more than 24V, the fault of the regulating valve can be obtained because of the main board fault;
if the real-time I/P driving voltage is greater than 24V, the output voltages of 4 output ports of the main board I/P driving voltage are set to be low level through an MCU in the intelligent valve positioner, after the level stability is ensured for 20ms, the real-time I/P driving voltage is stoped through an AD by using a stoping circuit, if the real-time I/P driving voltage is not less than 3V, the fault of the regulating valve is caused by the main board fault, and if the real-time I/P driving voltage is less than 3V, the I/P unit fault judgment is carried out;
5) I/P unit fault judgment:
and the main board I/P driving voltage is respectively and sequentially set as exhaust voltage, holding voltage and air inlet voltage, if the valve can enter the corresponding exhaust state/holding state/air inlet state, the failure cause of the regulating valve is judged to be an air path failure, otherwise, the failure cause of the regulating valve is judged to be an I/P unit failure.
In this embodiment, the MCU in the intelligent valve positioner sequentially sets the I/P driving voltage of the main board to the exhaust voltage corresponding to the regulating valve, and determines whether the regulating valve sequentially corresponds to the exhaust state/holding state/intake state according to the real-time opening of the regulating valve, if the regulating valve cannot sequentially correspond to the exhaust state/holding state/intake state, it may be determined that the failure of the regulating valve is due to the I/P unit failure.
In summary, if the specific cause of the failure of the regulating valve is still not determined after the air source failure determination, the main board failure determination, and the I/P unit failure determination, that is, the air source pressure is normal, the main board driving voltage is normal, the I/P unit intake/exhaust is normal, the failure cause of the regulating valve is the air path failure, and the failure cause is displayed by adopting the failure code after the failure cause is obtained.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the invention, and those skilled in the art will appreciate that the modifications made to the invention fall within the scope of the invention without departing from the spirit of the invention.
Claims (3)
1. The fault judging method of the regulating valve is characterized by comprising the following steps of:
1) Setting a dead zone threshold value, an air source pressure threshold value, a main board voltage maximum threshold value and a main board voltage minimum threshold value of the regulating valve;
2) If the difference value between the target opening of the regulating valve and the real-time opening of the regulating valve is not in the dead zone threshold range of the regulating valve, judging the air source fault;
3) Judging air source faults: if the real-time air source pressure is not within the air source pressure threshold range, judging that the fault source of the regulating valve is an air source fault, and if the real-time air source pressure is within the air source pressure threshold range, judging that the main board is faulty;
4) Judging the fault of the main board:
setting the I/P driving voltage of the main board as a high level, judging that the fault of the regulating valve is caused by the main board fault if the real-time I/P driving voltage is not greater than the maximum threshold value of the main board voltage, and setting the I/P driving voltage of the main board as a low level if the real-time I/P driving voltage is greater than the maximum threshold value of the main board voltage;
if the real-time I/P driving voltage is not smaller than the minimum threshold value of the main board voltage, judging that the fault of the regulating valve is caused by the main board fault, and if the real-time I/P driving voltage is smaller than the minimum threshold value of the main board voltage, judging the fault of the I/P unit;
5) I/P unit fault judgment:
and the main board I/P driving voltage is respectively and sequentially set as exhaust voltage, holding voltage and air inlet voltage, if the valve can enter the corresponding exhaust state/holding state/air inlet state, the failure cause of the regulating valve is judged to be an air path failure, otherwise, the failure cause of the regulating valve is judged to be an I/P unit failure.
2. The failure determination method of a regulator valve according to claim 1, characterized in that: the air source pressure threshold comprises an air source pressure maximum threshold and an air source pressure minimum threshold.
3. The failure determination method of a regulator valve according to claim 1, characterized in that: setting a time threshold in the step 2), and if the duration time of the difference value between the target opening of the regulating valve and the real-time opening of the regulating valve, which is not in the dead zone threshold range of the regulating valve, is larger than the time threshold, judging the air source fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111443703.8A CN114060603B (en) | 2021-11-30 | 2021-11-30 | Fault judging method of regulating valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111443703.8A CN114060603B (en) | 2021-11-30 | 2021-11-30 | Fault judging method of regulating valve |
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| Publication Number | Publication Date |
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| CN114060603A CN114060603A (en) | 2022-02-18 |
| CN114060603B true CN114060603B (en) | 2024-04-12 |
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Citations (7)
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|---|---|---|---|---|
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| CN113358345A (en) * | 2021-04-30 | 2021-09-07 | 广东韶钢工程技术有限公司 | Method for checking and solving faults of pneumatic regulating valve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5735383B2 (en) * | 2011-09-02 | 2015-06-17 | アズビル株式会社 | Control valve abnormality diagnosis method and apparatus |
-
2021
- 2021-11-30 CN CN202111443703.8A patent/CN114060603B/en active Active
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| CN104565520A (en) * | 2014-12-31 | 2015-04-29 | 重庆川仪自动化股份有限公司 | Intelligent valve positioner and control method thereof |
| KR20180080790A (en) * | 2017-01-05 | 2018-07-13 | 현대자동차주식회사 | Device for valve failure diagnosis and emergency driving of fuel cell air supply system |
| CN109899586A (en) * | 2019-03-22 | 2019-06-18 | 深圳市新可优科技有限公司 | A kind of digital type intelligent valve positioner |
| CN112051756A (en) * | 2019-06-05 | 2020-12-08 | 大连中和聚能自动控制系统有限公司 | Pneumatic actuator fault diagnosis recorder |
| CN112525521A (en) * | 2020-11-25 | 2021-03-19 | 重庆川仪自动化股份有限公司 | Regulating valve clamping fault detection method, terminal, medium and valve positioner |
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Non-Patent Citations (1)
| Title |
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| CN114060603A (en) | 2022-02-18 |
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