JPH0633384Y2 - Vibration monitoring device for reactor - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a vibration monitoring device for a reactor, and more particularly to a device for preventing malfunction when starting and stopping.

B. Outline of the Invention In the vibration monitoring device of the reactor, a system malfunction is prevented by preventing the alarm from being generated by the vibration acceleration detection output at the time of starting and stopping when detecting the vibration acceleration.

C. Conventional technology and its problems As preventive maintenance of conversion equipment, various continuous monitoring systems for gas analysis in oil, partial discharge, pressure, temperature, oil level, vibration, etc. are being implemented. Among them, in the case of preventive maintenance of the reactor, vibration monitoring using an acceleration sensor is effective and often used. The reactor is structurally susceptible to vibration, and if the contents tightening structure becomes loose due to deterioration over time, the vibration will gradually increase and the accident may spread. It can be prevented.

Since the vibration of the contents of the reactor propagates to the case tank, the acceleration sensor 2 is installed on the tank side plate of the reactor 1 as shown in FIG. 3, and the alarm device 5 is operated together with the computer or the recording unit 4 via the vibration monitoring device 3. It is processed as follows.

Such a vibration monitoring system is used in a rotating machine and other equipment machines and is capable of diagnosing abnormal deterioration due to looseness of the contents. Specifically, it has the configuration shown in FIG. That is, in FIG. 4, the pickup 2a of the acceleration sensor 2 detects the velocity G in the vibration force, reaches the output amplifier 9 via the input amplifier 6, the filter 7 and the amplifier 8, and also the RMS
(Effective value) The alarm is activated through the comparator 10, the alarm level comparator 11, the alarm on / off circuit 12, and the relay 13. In this case, the acceleration signal is set to an effective value by the comparator 10 and then the level comparison is performed by the comparator 11, and an alarm is issued when the effective value is equal to or higher than this level.

However, in the structure shown in FIG. 4, since the reactor is normally operated at a frequency of once or more than once a day, the rush current at the time of startup causes the reactor to exceed the alarm setting level which is higher than that in the steady state. Vibration may occur and cause malfunction.

In addition, it is not easy to receive an operation signal when installing on an already delivered product.

In view of the above-mentioned problems, the present invention provides a reactor vibration monitoring device that does not malfunction.

D. Means for Solving the Problems The present invention which achieves the above-mentioned object, in the vibration monitoring device of the reactor, prevents the generation of an alarm due to the vibration acceleration detection output at the time of starting and stopping when detecting the vibration acceleration. Characterize.

E. Embodiment An embodiment of the present invention will now be described with reference to FIGS. In FIG. 1, the same parts as those in FIG. 4 are designated by the same reference numerals and the description thereof will be omitted. In Fig. 1, the circuit that cuts the alarm output when starting and stopping is filter 7, amplifier 8, RMS.
Converter 10, comparator 11, alarm on / off circuit
It is provided in parallel with 12. This cutting circuit is a control circuit from the starter comparator 16 and the parallel timers 17 and 18 via the filter 14 and the RMS comparator 15.
At the same time, it is connected to the control circuit 19 from the amplifier 20, the stopping comparator 21, and the timer 22.

Vibration acceleration from the pickup is passed through the filter 14.
Obtained as the effective value of acceleration by the RMS converter 15. This effective signal is input to the startup comparator 16,
It is compared with the activation level shown in FIG. This starting level is the level that passes when the acceleration rises when starting,
The level is low enough not to drop to the starting level during normal reactor operation. Therefore, the activation level does not reach the activation level except at the time of stop except at the time of activation, but at the time of activation, the activation is judged by the comparator 16.

When the activation level is reached at the time of activation, the output of the comparator 16 drives the timer 17 for about 10 seconds to 3 minutes, and the control circuit 19 blocks the output of the alarm on / off circuit 12. Then, after the timer 17 is activated, the timer 18 is continuously activated and 3
It is further operated for about 60 minutes to continuously block the output of the alarm on / off circuit 12. As a result, the warning range level at startup is not output.

Further, the effective signal from the RMS converter 15 is amplified by the amplifier 20 by about 10 times, and compared with the stop level shown in FIG. This stop level is a level that passes when the acceleration at the time of stopping falls, and the stop is determined only by the falling at the time of stopping.

When the stop level at the time of stop is reached, the output of the comparator 21 drives the timer 22 for about 10 seconds to 3 minutes to prevent the control circuit 19 from outputting the alarm on / off circuit.

Here, the control circuit 19 can be turned on and off manually.

In the case of the above-mentioned start-up, the start-up is discriminated by the vibration acceleration exceeding the start-up level and the elapse of the set time by the timer 17, and the timer 18 waits for a predetermined time to stop the output of the alarm. , Two timers 17 and 18 are required. In this case, in this embodiment, the alarm circuit output is also blocked by the timer 19 based on the start determination.

F. Effect of the Invention As described in the above embodiments, the vibration monitoring system itself determines whether the system is started or stopped and locks the alarm output for a certain period of time. Therefore, there is no malfunction and various devices can be supported.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a determination diagram of start / stop based on acceleration, FIG. 3 is a simplified diagram of a vibration monitoring system, and FIG. 4 is a block diagram of a conventional example. . In the figure, 2 is an acceleration sensor, 16 and 21 are comparators, 17, 18 and 22 are timers, and 19 is a control circuit.

Claims (1)

[Scope of utility model registration request] 1. An output of an acceleration sensor provided in a reactor is compared with an alarm level, and an alarm is output when the level is higher than this level. In the case of outputting an alarm, the output of the acceleration sensor is compared with an activation level passed at the time of activation. A comparator, a timer that operates for a certain period of time after passing the level, a comparator that compares the output of the sensor with a stop level that passes when stopping, a timer that operates for a certain period of time when the level passes, and a timer for starting the above. A vibration monitoring device for a reactor, comprising: a control circuit that does not output an alarm signal according to the alarm level during the operating time of each of the timer and the timer when stopped.