JPH0237106Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a centralized monitoring system in which display devices corresponding to a large number of monitored locations are collected and arranged in one place to monitor the location where an abnormality occurs. The present invention relates to an alarm device that issues an alarm, and particularly to an alarm device for a centralized monitoring device suitable for a case where there are an extremely large number of locations to be monitored.

For systems that require continuous monitoring of multiple locations to prevent accidents, such as boiler equipment, the monitoring is carried out in one room (hereinafter referred to as the central control room) along with the various controls of the boiler equipment. This is done using centrally installed display and warning equipment. If the boiler equipment is large, the number of locations to be monitored can reach several hundred, and for this reason several hundred indicator lamps are arranged on the control panel installed in the central control room, depending on the location to be monitored. It happens. On the other hand, a buzzer is provided separately from these indicator lamps, and the indicator lamp not only visually indicates the occurrence of an abnormality, but also audibly indicates the occurrence of an abnormality.

With such a centralized monitoring device, if the deviation of the measured values of pressure, temperature, etc. at any monitored point in the boiler equipment becomes larger than in normal operation, the pressure switch, temperature switch, etc. will be activated. generates an abnormality signal, flashes the corresponding indicator lamp on the control panel in the central control room, and at the same time sounds an intermittent buzzer to notify the monitoring staff in the central control room of the occurrence of an abnormality at that location audibly and visually. do. The supervisor will be informed of the occurrence of an abnormality by the buzzer, confirm the abnormality by watching the blinking indicator lamp, examine the abnormal condition at the abnormality, and take necessary measures to prevent the occurrence of an accident. In this case, the buzzer can be stopped manually, but even if the buzzer is stopped, the indicator lamp will continue to blink or remain lit until the abnormality is gone or the indicator lamp is turned off by the supervisor.

Such a conventional centralized monitoring device has a drawback that, when abnormalities occur one after another, it is easy to overlook subsequent abnormalities. That is, when an abnormality occurs at a certain monitored location _A1 , the corresponding indicator lamp _L1 on the control panel in the central control room flashes and a buzzer sounds. The watchman learns of the occurrence of an abnormality when the buzzer sounds, checks the indicator lamp L ₁ and stops the buzzer, but if an abnormality occurs at another monitoring point A ₂ before the buzzer stops, the corresponding indicator lamp L ₂ also starts flashing. After the watchman stops the buzzer, the indicator lamps L ₁ and L ₂ will continue to blink. A time chart showing the above operation is shown in FIG. Figure 1 a shows the indicator lamp.
b indicates the operation of L ₁ , b indicates the operation of the indicator lamp L ₂ , and c indicates the operation of the buzzer. t ₁ is the abnormal signal generation time at the monitored location A ₁ , t ₄ is the abnormal signal generation time at the monitored location A ₂ , and t ₅ is the buzzer stop time. In addition, the pulse waveform from time t ₁ to time t ₂ is displayed by a display lamp.
Lighting and sounding state of L ₁ and the buzzer From time t ₂ to time t ₃ represents the state where the indicator lamp L ₁ is off and the buzzer is stopped. The same applies to the indicator lamp _L2 . In this way, when the indicator lamp L ₁ is blinking and the buzzer is sounding, and another indicator lamp L ₂ is blinking, the above-mentioned abnormal condition occurs, the watchman can confirm that the indicator lamp L 2 is blinking at the same time as the buzzer sounds. Since the display lamp is searched for, the display lamp _L1 is definitely visible. However, most of the observer's attention is taken up by the indicator lamp _L1 , so
The subsequent flashing of the indicator lamp _L2 is often overlooked, and this often occurs in large-sized monitoring equipment that has a large number of indicator lamps and cannot be checked at a glance.
Even if measures were taken for the monitored location _A1 , the monitored location _A2 would continue to be left unnoticed, and there was a danger that this would eventually lead to a major accident.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional methods, and to provide a centralized system that can reliably recognize the occurrence of an abnormality in another monitored location following the occurrence of an abnormality in one monitored location. To provide monitoring equipment and alarm equipment.

In order to achieve this objective, the present invention provides a centralized monitoring system in which a large number of indicators corresponding to monitored locations are arranged, and a common alarm for each monitored location is activated when an abnormality occurs. When an abnormality occurs in one monitored location, the alarm is activated in the first operation mode, for example, at a specific cycle, and when an abnormality occurs in two monitored locations at the same time, the alarm is activated in the first a second operating mode different from the first operating mode;
For example, the present invention is characterized in that an alarm operating mode changing means is provided to operate the alarm at a cycle clearly different from the specific cycle.

The present invention will be explained below based on the embodiment shown in FIG.

In Fig. 2, A ₁ , A _{2 . .} . A _o indicate the monitored parts of the boiler equipment. a ₁ , a ₂ …a _o are each monitored location
This is an abnormality detection device for A ₁ , A ₂ ...A _o , and when an abnormality occurs, it detects this, closes the contact, and outputs an abnormal signal. L ₁ , L ₂ . . . _Lo are indicator lamps provided on the control panel of the central control room corresponding to the respective monitored locations A ₁ , A _{2 .} E ₁ , E ₂ …E _o
are relays, and when the contacts of each of the abnormality detection devices a ₁ , a _{2 ,} . Relay E ₁ ,
E ₂ ...E _o contacts are connected to each indicator lamp L ₁ , L ₂ ...
Since it is connected to _Lo , when each relay operates and closes its contacts, the circuit of the indicator lamp corresponding to that relay will be connected. F is a blinking circuit, and 2 is a power supply.

M is a meter relay, with a pointer P, a contact R,
It has S and T. The meter relay M is provided in common for each abnormality detection device a ₁ , a ₂ ...a _o and each relay E ₁ , E ₂ ...E _o , and when the current value is 0, the pointer P
contacts contact R, contact S for a certain current value, and contact T for a current value about twice that current value. Since meter relays are well known, detailed explanation will be omitted. Different resistors r ₁ and r ₂ are connected to contacts S and T of the meter relay M, respectively. R ₁ , R ₂ , R ₃ , R ₄ , R ₅ are resistances,
C ₁ , C ₂ , C ₃ are capacitors, SCR ₁ and SCR ₂ are silicon controlled rectifiers, UJT is a unidirectional transistor, D is a diode, C is a buzzer, G is a manual switch, and B is a power supply.

Now, if an abnormality occurs at the monitored location _A1 ,
Abnormality detection device _a1 detects this abnormality and closes its contact. Therefore, relay E ₁ , meter relay M
current flows through, relay E ₁ closes its contacts,
Pointer P of meter relay M contacts contact point S. When the contact of the relay _E1 is closed, the indicator lamp _L1 is connected to the blinking circuit F and the power source B, and starts blinking at a predetermined period of the blinking circuit F to indicate the occurrence of an abnormality at the monitored location _A1 . On the other hand, meter relay M
When the pointer P contacts the contact S, the power supply B is connected to the circuit including the buzzer. This causes the unidirectional transistor UJT to oscillate with a time constant C ₁ (R ₁ + r ₁ ), and this oscillation causes the silicon-controlled rectifier SCR ₁ to turn on according to the periodic pulses generated in the resistor R ₃ . ,turn·
The silicon-controlled rectifier SCR ₂ repeats turning off and turning on in the opposite direction. By repeatedly turning on and turning off the silicon controlled rectifier SCR ₂ , the buzzer C will sound intermittently at a certain period. That is, the supervisor in the central control room is audibly notified that an abnormality has occurred in one of the monitored locations, and then the supervisor confirms that the indicator lamp L ₁ is flashing and confirms that the location where the abnormality has occurred is the monitored location A ₁ . I know that.

In this state, if an abnormality occurs in another monitored location, for example, monitored location _A2 , the contact of the abnormality detection device _a2 closes, the relay _E2 is activated, and the lamp _L2 blinks, as described above. At the same time, meter relay M has
Since about twice as much current flows as before, the pointer P contacts the contact point T. Since the resistor _r2 is connected to the contact T, the unijunction transistor
The time constant of UJT oscillation is C ₁ · (R ₁ + r ₂ ).
Therefore, the turn-on and turn-off intervals of the silicon-controlled rectifier SCR ₂ change, and the intermittent period of the buzzer C also changes. Since the change in the sound of Buzzer C is caused by the auditory sense, the observer immediately notices this change, and is able to detect the change in the monitored area that has already been confirmed.
Following A ₁ , we can know that an abnormality has occurred in one of the other monitored locations, and we will check the indicator lamps with that intention in mind, so we will check the indicator lamp L ₂ .
Never miss the flashing.

FIG. 3 is a time chart showing the above operation according to FIG. 1. a is the display lamp L ₁ , b
indicates that the indicator lamp _L2 is blinking, and c indicates that the buzzer C is intermittently sounding. At time t ₄ , the monitored location A ₂
When an abnormality occurs, the indicator lamp _L2 starts blinking as in the conventional case, but in this embodiment, it can be seen that the period of intermittent sounding of the buzzer C changes after time _t4 . When switch G is opened at time _t5 , the intermittent sounding of buzzer C stops.

In this way, in this embodiment, a meter relay is used to detect continuous abnormalities, and the intermittent period of the buzzer is changed according to this detection, so it is possible to check the continuous abnormality without missing it. can do.

In addition, in the above description, although the boiler apparatus was mentioned as an example of the system which requires monitoring, it is natural that it can apply not only to a boiler apparatus but also to other systems. Furthermore, although a display lamp is used as an indicator and a buzzer is used as an alarm, various other indicators and alarms can be used in addition to the display lamp and the buzzer. Furthermore, as an example of changing the mode of operation of the alarm, we have given an example of changing the intermittent cycle of the buzzer, but this is not limited to this, and it is also possible to change the intensity, pitch, and tone of the alarm's sound. Or different types of alarms (e.g. buzzer and bell)
Can also be used in combination. Furthermore, by providing a switch that short-circuits the blinking circuit of the lamp in conjunction with the buzzer stop operation, the indicator lamp can be kept on continuously after the buzzer stops.

As described above, in the present invention, when an abnormality occurs in a certain place, followed by an abnormality in another place, or at the same time, the mode of operation of the alarm is changed to the operation when an abnormality occurs in one place. Since the configuration is changed to a different one, it is possible to confirm abnormalities in other locations without missing them.

[Brief explanation of the drawing]

Figures 1a, b, and c are time charts of the operation of indicator lamps and buzzers of a conventional central monitoring device, Figure 2 is a circuit diagram of an alarm device of a central monitoring device according to an embodiment of the present invention, and Figure 3a is a , b and c are time charts of the operation of the indicator lamp and buzzer shown in FIG. A ₁ , A ₂ … A _o … Monitored area, a ₁ , a ₂ … a _o …
Abnormality detection device, L ₁ L ₂ ...L _o ...Indication lamp, E ₁ ,
E ₂ ...E _o ...Relay, M...Meter relay, C...
...buzzer, r ₁ , r ₂ ...resistance.

Claims (1)

[Scope of utility model registration request] A large number of display devices are arranged according to the monitored locations, and each of the monitored locations is activated when the abnormality occurs. In a centralized monitoring device equipped with a common alarm, the alarm is activated in the first operating mode when there is one monitored location with an abnormality, and when there are two monitored locations with an abnormality at the same time. 1. An alarm device for a central monitoring device, characterized in that an alarm operating mode changing means is provided for operating the alarm in a second operating mode different from the first operating mode.