JP2002372168A - Maintenance timing detecting device, method and program for valve driving actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique of measuring a leaking amount during full closing of the valve secondary side without halting operation. SOLUTION: A leakage detector for a valve is characterized by that it is provided with a flow meter provided on the outflow side of the valve, a reference leaking amount measuring means of acquiring a flow rate measured value by the flow meter when the valve is fully closed in a predetermined reference condition, and an anomaly judging means of comparing an expected value by the reference leaking amount measuring means with a flow rate measured value by the flow meter when the valve is in a fully closed state during normal usage and judging a leakage anomaly of the valve by their difference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus, a method and a program for detecting in advance an abnormality of a valve drive actuator for driving a butterfly valve or the like.

[0002]

2. Description of the Related Art With respect to abnormalities during the operation of a valve driving actuator, an apparatus having means for detecting these abnormalities and outputting them to the outside has been filed. For example, Japanese Patent Application No. 09-060581 and Japanese Patent Application No. 09-060582
No. These inventions are for informing the outside of the stop of the machine due to the abnormality, and abnormally stop when an actual abnormal state occurs.

[0003]

However, in an operation using a valve or the like, suddenly stopping the operation for an unexpected reason causes an enormous loss. It is too late to notify the administrator after an error has occurred. In such a valve drive actuator that abnormally stops, there are many signs that appear in the operating conditions and the data recorded inside, etc., and the administrator suddenly stops because the administrator has left it unnoticed. There are many cases. Therefore, in order to prevent such a sudden abnormal stop, it is necessary to check the signs of abnormalities beforehand, but such preliminary detection is effective even if it is actually performed. It is usually thin and not implemented, and is used in severe situations until the valve or valve drive actuator is damaged. Accordingly, an object of the present invention is to provide a valve driving actuator maintenance device, method, and method capable of detecting the above-described abnormality before it occurs and outputting a signal regarding the necessity of maintenance to the outside.
And its programs.

[0004]

In order to achieve the above-mentioned object, the present invention as defined in claim 1 provides an energizing time measuring means for measuring a power-on time to a valve driving actuator; An angle fluctuation time measuring means for measuring a valve angle fluctuation time by the actuator, wherein a ratio of a power-on time to the valve driving actuator by the energization time measuring means and a valve angle fluctuation time by the angle fluctuation time measuring means is provided. And a maintenance signal output means for outputting a signal relating to maintenance in response to the maintenance timing.
The invention according to claim 2 is a method invention, which measures a power-on time to a valve driving actuator, measures a valve angle variation time by the valve driving actuator, and supplies a power to the valve driving actuator. This is a method for detecting the maintenance time of a valve driving actuator that outputs a signal related to maintenance in accordance with the ratio between the ON time and the valve angle fluctuation time. Further, the invention according to claim 3 is a maintenance time detecting program, which measures a power-on time to a valve driving actuator,
To execute a step of measuring a valve angle variation time by a valve driving actuator and a step of outputting a signal relating to maintenance according to a ratio of a power-on time to the valve driving actuator and the valve angle variation time. The program is configured as a computer-readable maintenance timing detection program for a valve driving actuator.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Embodiments embodying the present invention will be described for the understanding of the present invention. Here, FIG. 1 is a hardware configuration diagram of a valve timing actuator maintenance time detection device according to an embodiment of the present invention, and FIG. 2 is a flowchart showing a detection procedure in the detection device. Based on the hardware configuration shown in FIG. 1 and the flowchart shown in FIG. 2, a procedure for issuing a maintenance alarm will be described together with the hardware configuration.
Here, S1, S2,... Indicate the step numbers of the program for executing the procedure shown in FIG. A valve opening set value signal from a target value setting unit (not shown) is converted from a set value input circuit 12 into a digital signal by a first A / D converter 13 and then input to a determination circuit 11. On the other hand, after the valve angle signal detected by the operation angle feedback signal generator 14 attached to the output shaft of the motor M is input to the feedback input circuit 15, the second A / D converter 1
The digital signal is converted into a digital signal at step S6 and input to the decision circuit 11 (S9). The determination circuit 11 calculates the difference between the digital signals from the first and second A / D converters 13 and 16 (S10) and sends the difference to the motor drive circuit 17. The motor drive circuit 17 drives the motor M according to the difference (S11). As a result, the motor M rotates in the direction in which the difference becomes smaller, and the valve is driven via the valve driving actuator connected to the motor so as to approach the target opening. The drive control of the valve as described above is a conventionally known method. The judgment circuit 11 operates the operation time timer 1 when the judgment circuit 11 is energized (for example, when the power is turned on). The operation time timer 1 operates at predetermined measurement time intervals (for example, every one second) (S1
2), the elapsed time is stored in the volatile memory 2 (S1).
3). At the same time, it notifies the memory transfer circuit 3 that the value of the volatile memory 2 has been updated. On the other hand, when the external setting signal changes, the determination circuit 11 compares the value from the feedback input circuit 15 with the set value and sends the difference to the motor drive circuit 17 to drive the motor M as described above. When sending a drive signal to the motor M in this way,
That is, when the above difference is detected, the motor drive circuit 17
Causes the motor drive time timer circuit 4 to operate. The motor drive time timer circuit 4 stores the elapsed time in the volatile memory 2 at every predetermined measurement time interval (for example, every one second) (S1, S2). Thus, the volatile memory 2 has two storage areas. The memory transfer circuit 3 checks the operation time in the volatile memory 2 based on the volatile memory update timing sent from the operation time timer circuit 1 and determines whether the operation time has passed a predetermined check time interval (for example, one hour). A judgment is made (S3). When the memory transfer circuit 3 determines that the predetermined check time interval (for example, one hour) has elapsed, the memory transfer circuit 3 compares the operation time and the motor drive time in the volatile memory 2 with the nonvolatile memory. Transfer to 5. As a result, the operation time (power-on time) and the valve angle change time by the motor M, that is, the valve drive time, are recorded in the nonvolatile memory 5 (S4). The maintenance judgment circuit 6 retrieves the data of the operation time and the motor drive time from the non-volatile memory, finds the ratio of the motor drive time to the operation time (S5), and stores the list value stored therein (the contents of the list are shown in FIG. 3), a maintenance time interval at which maintenance is deemed necessary is determined (S6), and the maintenance time interval is compared with a predetermined maintenance time interval stored in the non-volatile memory. A signal is sent to the maintenance signal generation circuit 7, and the maintenance signal generation circuit 7 outputs a maintenance warning signal to the outside (S7).

[0006]

In the above embodiment, the case where the judgment circuit and the like are provided in the drive device of the actuator for driving the valve has been described. However, this is merely an example. For example, another management computer or other valve may be used. It may be provided in a drive device. The present invention is provided for a drive actuator of various valves. For example, a butterfly valve is one example, but it goes without saying that the present invention can be applied to other ball valves and the like.

[0007]

As described above, the present invention (claim 1)
Comprises an energization time measuring means for measuring a power-on time to the valve driving actuator, and an angle fluctuation time measuring means for measuring a valve angle fluctuation time by the valve driving actuator. Timing of maintenance of a valve drive actuator, comprising: maintenance signal output means for outputting a signal relating to maintenance in accordance with the ratio between the power-on time to the actuator and the valve angle variation time by the angle variation time measurement means. Device. According to the present invention, the frequency of use of the valve driving actuator is automatically obtained from the ratio of the power-on time to the valve driving actuator by the energization time measuring means and the valve angle fluctuation time by the angle fluctuation time measuring means. Can be Since the scheduled maintenance time depends on the frequency of use, a signal such as a maintenance alarm generated based on the frequency of use indicates an objective maintenance time of the actuator, so that the administrator needs to make unnecessary checks. You can know the exact maintenance time without having to do it. Also, as a method invention,
The power-on time to the valve driving actuator is measured, and the valve angle fluctuation time by the valve driving actuator is measured, and the power-on time to the valve driving actuator and the valve angle fluctuation time are calculated according to the ratio. A method for detecting a maintenance time of a valve driving actuator for outputting a signal relating to maintenance. The effects of the present invention are the same as the effects of the above-described device, and thus description thereof will be omitted. Further, the invention of the maintenance time detecting program includes a step of measuring a power-on time to the valve driving actuator, a step of measuring a valve angle variation time by the valve driving actuator, and a method of measuring the power-on time to the valve driving actuator. And a computer-readable valve drive actuator maintenance time detection program for executing a step of outputting a signal relating to maintenance according to the ratio of the valve angle variation time. Also in this case, the effect is the same as that of the device, and the description is omitted.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a hardware configuration of a valve driving actuator according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing procedure of a program for detecting a maintenance time.

FIG. 3 is a correspondence diagram of a maintenance interval corresponding to a ratio of a motor driving time to an operation time.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Operation time timer circuit 2 ... Volatile memory 3 ... Memory transfer circuit 4 ... Motor drive time timer circuit 5 ... Non-volatile memory 6 ... Maintenance judgment circuit 7 ... Maintenance signal generation circuit 11 ... Judgment circuit 12 ... Set value input circuit 13 ... first A / D converter 14 ... operating angle feedback signal generator 15 ... feedback input circuit 16 ... second A / D converter

Claims (3)

[Claims] 1. An energization time measuring means for measuring a power-on time to a valve driving actuator, and an angle fluctuation time measuring means for measuring a valve angle fluctuation time by the valve driving actuator. The power-on time to the valve drive actuator by
A maintenance timing detecting device for a valve driving actuator, comprising: a maintenance signal output unit that outputs a signal relating to maintenance in accordance with a ratio of the valve angle variation time by the angle variation time measurement unit. 2. A power-on time to the valve driving actuator is measured, and a valve angle fluctuation time by the valve driving actuator is measured, and the power-on time to the valve driving actuator, the valve angle fluctuation time, A method for detecting the maintenance time of a valve drive actuator that outputs a signal related to maintenance according to the ratio of A step of measuring a power-on time to the valve driving actuator; a step of measuring a valve angle variation time by the valve driving actuator; a power-on time to the valve driving actuator; A computer-readable valve drive actuator maintenance time detection program for executing a step of outputting a signal related to maintenance in accordance with a ratio with a fluctuation time.