JPH0658295B2 - Abnormality diagnostic device for intake flow control valve - Google Patents

Description

TECHNICAL FIELD The present invention relates to an abnormality diagnosis device which is incorporated in a water intake flow control valve provided in the middle of an intake water pipe for sending water from a water intake plant to a water treatment facility such as a water purification plant. .

[Conventional technology]

At the water treatment plant mentioned above, a water intake flow control valve was installed in the middle of the water intake conduit connecting the water intake valve of the water intake plant and the regulating pond (landing well) of the water purification plant, and adjustments were made based on the water distribution plan of the water treatment plant. The intake flow rate is controlled between the intake well and the regulating pond so that the flow rate of intake water sent to the pond and the flow rate of water sent to the water treatment section at the subsequent stage are balanced.

[Problems to be Solved by the Invention]

By the way, the water before purification treatment that is sent from the intake well to the regulating pond contains mud and dust, and for this reason, foreign substances such as dust often clog the intake flow control valve during the intake. An abnormal situation may occur.

However, in the past, the abnormal state of the intake water flow control valve has not been detected, and the current situation is that the intake water flow control is continued while foreign matter remains blocked. Therefore, if the valve is forcibly operated in a state where the foreign matter is clogged, excessive torque is applied to the valve mechanism to cause a failure, which causes a problem that seriously hinders the operation of the water treatment facility.

The present invention has been made in view of the above points, and when an abnormality occurs in the intake flow rate control valve, it is possible to automatically notify the operator of the abnormality before the valve failure occurs. An object is to provide a valve abnormality diagnosing device.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the abnormality diagnosis device according to the present invention comprises means for obtaining flow rate data corresponding to the valve opening degree from the valve opening degree / flow rate characteristics of the intake water flow rate control valve, and an actual flow rate measurement value measured by a flow meter. The measured flow rate data and the flow rate data are provided with a calculating means for comparing the flow rate data corresponding to the valve opening degree of the intake water flow rate control valve detected at the same time to obtain the flow rate difference and an alarm means for notifying the occurrence of a valve abnormality. It is configured to output an alarm when it is determined that the intake flow control valve is abnormal under the condition that the difference in the flow rate between and exceeds the abnormality determination reference value.

[Action]

If an abnormal situation occurs when foreign matter is blocked in the intake flow control valve while controlling the intake flow rate in the intake conduit system, the valve opening and the actual flow rate through the conduit do not correspond, and the valve Even if is fully open, the flow rate becomes small because the water flow is restricted by foreign matter.

Therefore, in the above configuration, the valve opening degree of the intake water flow control valve is constantly detected, and the flow rate data Q2 corresponding to the detected valve opening degree obtained from the valve opening degree / flow rate characteristic curve of the intake water flow control valve,
The flow rate difference | Q1−Q2 | of both is compared with the measured value Q1 of the intake water flow rate measured by the flow rate system, and here the flow rate difference | Q1
If -Q2 | exceeds the predetermined abnormality judgment reference value Q3, it is judged as abnormal and an alarm signal is output and the alarm device is activated. As a result, abnormality diagnosis of the intake flow control valve can be automatically performed.

In addition, by connecting the abnormality diagnosis device and the control unit of the intake flow control valve, and when an abnormality is detected, the alarm signal is given to the control unit and the subsequent valve control operation is interrupted, thereby forcing the valve operation. The occurrence of valve failure can be avoided.

〔Example〕

FIG. 1 shows a flow chart of an embodiment of the present invention. In the figure, 1 is an intake well of a water intake plant, 2 is a regulating pond (landing well) of a water purification plant, 3 is an intake water conduit piped between the intake well 1 and the regulating pond 2, and 4 is in the middle of the water pipe 3. The intake flow rate control valve as a motor-operated valve, 5 is a flow meter, 6 is a control section of the intake flow rate, and 7 is an abnormality diagnosis device for the intake flow rate control valve according to the present invention. Further, the abnormality diagnosis device 7 includes a flow rate data reading unit 8,
Calculation unit 9, timer 10, alarm device 11, and flow rate indicator 1
It is composed of 2, 13, etc.

Here, the flow rate data reading unit 8 determines the valve opening degree Z detected by the valve opening degree detector 15 attached to the intake water flow rate control valve 4 based on the valve opening degree / flow rate characteristic 14 specific to the intake water flow rate control valve 4. The corresponding flow rate data Q2 is read out. Further, the calculation unit 9 compares the measured flow rate value Q1 measured by the flow meter 5 with the above-mentioned flow rate data Q2, and compares it with a predetermined abnormality determination reference value Q3. The flow rate values Q1 and Q2 are the flow rate indicators 12, 13
Be instructed to.

With such a configuration, normally the measured flow rate Q1 measured by the flow meter 5
Is controlled by the control unit 6 and the deviation from the flow rate setting value is used as a control signal to adjust the valve opening degree of the intake flow rate control valve 4 so that the intake flow rate sent from the intake well 1 to the regulating pond 2 is kept constant. Have control.

On the other hand, the measured flow rate Q1 measured by the flow meter 5 and the valve opening Z of the intake flow control valve 4 detected by the valve opening detector 15 are sent to the abnormality diagnosis device 7 every moment. Then, in the calculation unit 9, the flow rate difference between the measured flow rate Q1 and the flow rate data QD corresponding to the detected valve opening Z determined from the valve opening / flow rate characteristic 14 | Q1-Q2
| Is calculated and compared with a predetermined abnormality determination reference value Q3. Here, it is determined that an abnormality has occurred in the intake flow rate control valve 4 under the condition that the calculated value of the flow rate difference | Q1-Q2 | exceeds the abnormality determination reference value Q3, and this abnormal state is determined by the timer 10 for a predetermined time (number of times). After confirming the continuation, the alarm signal A is given to the alarm device 11 to notify the operator of the occurrence of the abnormality. At the same time, this alarm signal A is also given to the control unit 6,
The subsequent flow rate control operation is interrupted so that the valve opening degree of the intake water flow rate control valve 4 is stopped at the state at that time. If the control unit 6 is reset after the abnormality of the intake water flow control valve 4 is restored, the normal flow control state is restored again.

Note that the valve opening / flow rate characteristics of the intake flow control valve 4 are
Changes with changes in water level. Therefore, by taking in the water level signal H detected by the water level gauge 16 installed in the intake well 1 and correcting the stored data of the valve opening / flow rate characteristic 14 described above, the valve data can be calculated based on the flow rate data considering the pressure fluctuation. The abnormality diagnosis can be performed more accurately.

〔The invention's effect〕

The abnormality diagnosing device for the intake flow rate control valve according to the present invention is configured as described in the abnormality, and therefore has the following effects.

(1) When foreign matter such as dust is clogged with the intake flow rate control valve while the flow rate is being controlled, it is possible to automatically detect the occurrence of an abnormality and notify the operator so that an immediate recovery can be achieved.

(2) Also, by connecting the abnormality diagnosis device to the control system of the water flow control valve and automatically interrupting the control operation of the water flow control valve after an abnormality occurs, it is possible to force the foreign matter to remain blocked. It is possible to prevent occurrence of failure of the valve mechanism due to various valve operations.

[Brief description of drawings]

FIG. 1 is a flow chart of an abnormality diagnosis device for a water intake flow control valve according to an embodiment of the present invention. In the figure, 1: intake well, 2: regulating pond, 3: intake conduit, 4: intake flow control valve, 5: flow meter, 6: flow controller, 7: abnormality diagnostic device, 8: flow data reader, 9: arithmetic unit, 11: alarm device, 14: valve opening / flow rate characteristic, 15: valve opening detector.

Claims (1)

[Claims] 1. An abnormality diagnosis device for a water intake flow control valve provided in the middle of a water intake conduit, for obtaining flow rate data corresponding to the valve opening from the valve opening / flow rate characteristics of the intake water flow control valve, Computation means for comparing the actual flow rate measured by the flow meter with the actual flow rate measured at the same time as the flow rate data corresponding to the valve opening of the intake flow rate control valve detected at the same time, and calculating the flow rate difference, and the occurrence of a valve abnormality And an alarm means for informing that the intake flow rate control valve is abnormal and outputs an alarm signal under the condition that the flow rate difference between the measured flow rate value and the flow rate data exceeds the abnormality determination reference value. A device for diagnosing abnormalities in the intake flow rate control valve.