JPS5943780A - Method of controlling explosion preventive elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (a) Technical field The present invention relates to a control method for an explosion-proof elevator.

(b) Technical background of the invention In an elevator installed in a building that handles explosive raw gas, if the elevator is installed in a dangerous place where there is a risk of generating a sufficiently explosive dangerous atmosphere, the dangerous atmosphere Depending on the time and frequency of the gas being present, and the type of target gas, specified explosion-proof electrical equipment must be provided, but it must be installed in a non-hazardous location where there is no possibility of creating a hazardous atmosphere even under normal or abnormal conditions. In cases where -C is not necessarily an absolutely safe place, and the probability of becoming dangerous is extremely low, explosion-proof measures are often taken in accordance with those for dangerous places. For example, in relatively dangerous places. Explosion-proof equipment, etc. is applied to hall equipment and hoistway equipment close to the location, but it would be costly to completely explosion-proof the electric motors, control devices, etc. in the elevator machine room due to their size and structure. To avoid this, it is often the case that a pressure fan is installed on the wall of the machine room and runs constantly to increase the internal pressure of the machine room, or else a method similar to the ventilation-type internal pressure explosion-proof structure is used, which involves forced ventilation.

Figure 1 shows the configuration of an explosion-proof elevator that increases the internal pressure in the machine room. [Idiot, 2 is a rope, 3 is a roll”--machine,
4 is a power supply panel, 5 is an Ill control panel, 6 is a drop-off passage, 7 is a landing, 8 is a machine room, 9 is a lobe hole, and 10 is a pressure fan.

If an accident such as explosive gas leakage occurs and the elevator installation location becomes a dangerous atmosphere, the pressure in the machine room is constantly increased by a pressure fan 10 to prevent gas from flowing into the machine room.

This method requires the pressure fan to be absolutely reliable, but since the elevator is installed in a non-hazardous location,
No special consideration was given to the trouble of stopping the pressure fan.
In the unlikely event of a situation, it could lead to personal injury.

(C) Purpose and Summary of the Invention The present invention has been made in view of the above points, and aims to prevent a dangerous atmosphere from filling the machine room by increasing the internal pressure of the machine room or by performing forced ventilation of the machine room. , tL, by detecting the stoppage of the C1 pressure cuff in the explosion-proof elevator, the tll control device automatically shuts off the elevator safety source after the elevator is stopped by emergency landing on a predetermined floor. To provide a control method for an explosion-proof elevator that prevents explosion accidents caused by electric sparks generated in an elevator.

(d) Embodiment of the Invention An embodiment of the control method for an explosion-proof elevator according to the present invention will be explained below with reference to the drawings.

FIG. 2 is a drowsiness circuit diagram related to the present invention (2), in which 11 represents an elevator motor, 12 represents its control device, and its power source is received from It, S, and T through a power switch 13.

Further, 14 is a pressure fan that increases the internal pressure of the machine room. Reference numeral 15 denotes a fan stop detector, which is operated by detecting voltage or wind pressure. The power switch 13 has a main contact portion 81. Exception 1 - consisting of coil TC1 and auxiliary contact TSI, 16 is a control circuit in addition to the new one in the present invention, XD,
XT, ZT.

f(, R, YT, T RP, etc. are relays and timers that perform control. This control circuit is usually built into the elevator control panel. The operation will be explained step by step with reference to the operation explanatory diagram shown in FIG.

If the fan 14 is in normal operation, the elevator will be in normal operation.

Assume that the fan 14 has stopped operating due to some kind of failure or an artificial power cut.

The fan stop detector 15 detects this and its signal contact I
5 opens, the control power supply P supplied from the control device 12,
The detection relay XD provided between N is turned OFF'. If this state continues for T seconds, it is assumed that the fan operation has stopped, and the detection timer XT self-holds at the ONL, , and XTax contacts. After this, the elevator enters emergency landing operation. XTtn
opens, the call registration circuit Cl that has already been implemented is opened, and at the same time all calls are deleted (= no new calls can be created. A signal is applied to circuit D1, and the elevator is configured to decelerate and land at the nearest floor.

When the elevator enters the door zone, D and Za+ of the door zone detection relay (not shown) are closed, and when the landing stop relay (Ul)bu of the landing stop relay (not shown) is closed, the evacuation landing detection relay R and It are activated. ON, self-holds with I(, Ra+, and detects the completion of landing.Mo(~Fan stop detector 1
If the elevator has stopped landing when 5 operates, XT
When a limited time of 1p seconds has elapsed, the call circuit is disconnected, and R・1( is turned ON) to detect the completion of landing on the floor. Also, when the elevator is at rest 1~゛C, the DZ relay is turned OFF. If it stays at L, i(,)l will not be able to turn on.Therefore, it must be turned off during the pause that has already been carried out.
A contact point CCbx of a CC relay (not shown) is provided.

As a result, even when the vehicle is at rest, it is assumed that the RR is turned on and the vehicle has landed on the floor.

Next, when 18 seconds have passed since RRaz is closed, the shutoff preparation completion timer YT is turned on. The time T may be the time required for the passengers or workers inside the car to escape.

When YTa+ is closed, the power cutoff command relay TRP is turned on, so the tripping coil Tel provided in the elevator power switch 13 is connected to P -TRPa+ -Tel-.
A voltage is applied from TSI-Nl2, and the main contact portion 81 is automatically disconnected. The auxiliary contact TS1 is an interlocking contact of the main contact portion Sl, and when the contact 81 is cut off, it opens the subsequent tripping circuit.

At this time, the power supply to the 1-lie elevator is completely disconnected.

Of course, all relays, timers, etc. mentioned in v1■ are also off.
Do 'E'. By doing this, electrical sparks and the like generated from the elevator electrical circuit will no longer occur.

By the way, in the above operation, if a problem with the control device makes it impossible to land on the floor, or if one relay malfunctions even after landing on the floor, the YT, TRP relays, etc. will not operate, and the 'C power supply will not work. J- or a constant 1L stoppage may occur, and the danger increases with time.

A final protection timer ZT is provided to protect against such situations. This means that when time T2 elapses after the fan stop city is detected,
It turns ON completely regardless of the control operation described above, and closes the contact ZTaI of 7-C. As a result, the relay T H, P
ON Executes L-c automatic cutoff.

7. The limited time period T of T is set by the following relationship.

T2> (Maximum travel time to landing floor + Escape time for chicks) By providing the above protection timer, the safety device is a double system (two systems), further improving reliability.

In the operation explanation 1 diagram shown in Fig. 3, if the elevator operates normally, it will operate as shown by the solid line and the automatic shutoff will be completed at time T, but in the unlikely event that it is in an abnormal state, ZT is in protective operation as shown by the dotted line, and the automatic shutoff is completed at time T.

In addition, as an example, Tl-5 seconds T T2 = 3 minutes, T,
= 3Q seconds or so.

The elevator that makes emergency landing in this way remains in a dormant state. Note that the building is usually equipped with a gas leak alarm device, etc., and gas leak accidents are usually discovered. Once the gas concentration etc. have been checked and it is confirmed that it is safe, the power can be restored completely by manually turning on the power breaker.

These are carried out by safety managers.

In the embodiments described above from 1 to 1, the method is to land on the nearest floor, but it is also possible to land on a specific floor, for example, an evacuation floor. You can do it by choosing.

1. Although we have shown an example of cutting off the power supply, auxiliary circuits such as the electric/beta lighting circuit and the communication circuit can also be automatically cut off in the same way. FIG. 4 shows an example of automatically shutting off the lighting circuit.

When the stoppage of fan operation is detected, the elevator performs an evacuation landing operation, but passengers and workers in the car or in the hall may not understand the situation and may cause confusion. Therefore, countermeasures can be taken such as ringing an alarm bell BL or lighting an indicator light LP as shown in FIG.

In the above embodiment, an example was shown in which the circuit breaker in the elevator machine room is automatically shut off, but it is also possible to go back to the power supply side and automatically shut off the circuit breaker in the electrical room.

In this case, the power receiving end of the machine room is also in a no-voltage state, which can further improve safety.

(g) A combined effect As explained above, according to the present invention, when the pressure fan or the ventilation fan stops, the elevator is moved to the evacuation floor,
After giving the passengers or workers time to evacuate, the power supply for the elevator is completely automatically turned off, so even if a dangerous atmosphere occurs, there will be no electrical sparks from the elevator electrical equipment. Explosion accidents can be prevented before they occur.

This can have a very significant effect in preventing serious disasters.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of an explosion-proof elevator that increases the internal pressure of the machine room, for the purpose of explaining the technical background of the present invention, Fig. 2 is an example of an electric circuit according to the present invention, and Fig. FIG. 4 is a circuit diagram for automatically shutting off the lighting power supply related to the present invention, and FIG. 5 is a circuit diagram of a notification device related to the present invention. 13...Panawa source switch 14...Fan 15...
・Fan stop detector [6...Control circuit (7317)
Representative Patent Attorney Kensuke Chika (and 1 other person) Figure 2 Figure 3 Figure 5

Claims (2)

[Claims] (1) In a control method for an explosion-proof elevator in which a fan is used to prevent an increase in the internal pressure of an elevator machine room or the filling of a hazardous atmosphere by forced ventilation, a fan stop detector is provided to detect when the fan has stopped; A control method for an explosion-proof elevator, characterized in that when a stop detector is activated, the explosion-proof elevator is brought to a predetermined floor and stopped, and after a predetermined period of time, power to the explosion-proof elevator is cut off. (2) The explosion-proof elevator control method according to claim 1, wherein the predetermined floor is a nearest floor or an evacuation floor.