JPS5829105Y2 - elevator elevator - Google Patents

Description

[Detailed description of the invention] This invention relates to a fire detection device for an elevator.

When a fire breaks out in a building, elevators are switched to fire control operation to prevent cars from stopping on the floor on fire, t7'n, and evacuate passengers inside the cars.

As a fire detection device for this purpose, a fire detector is installed on each floor of the building, and a fire detector is installed at the top of the elevator hoistway so that the fire can enter the hoistway through the gap between the doors of the landing on the fire floor and reach the top. There are devices that detect smoke.

However, the former method requires a large number of fire detectors, which increases equipment and maintenance costs for interconnecting them, while the latter method can be installed at low cost, but has the disadvantage of delaying fire detection. there were.

This invention aims to eliminate the above-mentioned drawbacks and provides a fire detection device for elevators that can be installed at low cost and can detect the occurrence of a fire at an early stage.

Below is Part 1. An embodiment of this invention will be explained with reference to FIG.

In the figure, 1 is an elevator hoistway, 2 is a large number of landings provided therein, 3/fi is an elevating body consisting of a car that goes up and down the hoistway 1, and 4 is an elevator that goes up and down in the opposite direction. The weight 5 is a well-known fire detector that is attached to the outer surface of the elevating body 3 and is activated when it comes into contact with a fire current such as smoke or high-temperature air.

Figure 2 is a logic circuit diagram, where 6Ifi is the fire signal that is emitted when the fire detector 5 is activated, and 7 is the fire detector 5.
8 is a normal signal that is emitted when the device is not operating, and is set and stored when an input is input to the S side, and is reset and the memory is erased when an input is input to the R side.

9 is an evacuation descending signal, and 10 is a descending movement that is issued when the elevating object 3 moves downward between predetermined floors after the normal signal 7 is issued during the descending operation of the elevating object 3 due to the operation of the fire detector 5. Signal, 11//'i Evacuation floor signal issued when the elevator 3 arrives at a predetermined landing 2 configured with a fire protection structure, that is, an evacuation floor, 12.13 is an AND gate, 14 is an OR gate, 15 1 is an evacuation stop signal, and 16 is a control device.

Now, if a fire breaks out in the landing 2 provided in the middle of the hoistway 1, the fire air will enter the hoistway 1 through the gap between the doors of the landing 2 and rise.

In this case, when the elevator 3 is above the floor on fire, the fire detector 5 senses the fire airflow and operates.

As a result, a fire signal 6 is issued, a memory device 8 is set, and an evacuation descent signal 9 is issued, so that the control device 16 causes the elevator 3 to be operated in a descending manner.

Then, when the elevating body 3 passes through the floor on fire, there is no fire airflow, so the fire detector 5 becomes inactive and the normal signal 7 is emitted.

Then, when the elevating body 3 further moves downward and moves between predetermined floors and reaches the safe landing 2, a downward movement signal 10 is issued.

At this time, since the fire signal 6 is stored, the AND gate 12 issues an output, the evacuation stop signal 15 is issued via the OR gate 14, and the control device 16 causes the elevator 3 to stop.

Immediately, the fire signal 6 in the storage device 8 is erased by the evacuation stop signal 15.

Further, if the elevator 3 is lowered by the evacuation descending signal 9 and reaches the evacuation floor before the descending movement signal 10 is emitted, the evacuation floor signal 11 is emitted, and the storage device 8
Since the fire signal is stored in , the AND gate 13 issues an output, and the evacuation stop signal 15 is issued via the OR gate 14.

Therefore, at this time, the elevating body 3 is stopped on the evacuation floor.

In addition, when the elevating body 3 is stopped by the evacuation stop signal 15, the elevator is put into a dormant state and subsequent automatic operation is stopped.

Since the fire detector 5 is attached to the moving elevating object 3, it is possible to detect a fire that occurs on a floor below the elevating object 3.
Early detection is possible with a small number of fire detectors 5.

Therefore, it becomes possible to carry out evacuation operation of the elevating body 3 at an early stage with a small equipment cost.

In this embodiment, if a building has a plurality of evacuation floors, it is easy to use the fire signal 6 to move the elevator 3 up to the appropriate evacuation floor.

- When multiple elevators 3 are installed in the hoistway 1, when the fire detector 5 of any elevator 3 is activated, all elevators 3 are put into evacuation operation. It is clear that the same effects as those of the embodiments shown in FIGS.

As another embodiment, a fire detector is also provided on the counterweight 4, and when either this or the fire detector 5 of the elevating body 3 is activated, the elevating body 3 is immediately operated for evacuation. This is also easily possible.

Also, when the fire detector of the counterweight 4 is activated when the elevating body 3 is above the counterweight 4, and the distance between the elevating body 3 and the counterweight 4 is When it is long enough, it is easy to make the evacuation stop of the elevating body 3 at the nearest floor. It is clear that the same effect as the embodiment of FIG. 2 can be obtained.

As explained above, this invention is designed to detect that the elevating object is above the floor on fire by attaching a fire detector to the elevating object and detecting the fire airflow that enters the hoistway and rises. Because I did.

The purpose of the present invention is to realize a fire detection device for an elevator that can detect the occurrence of a fire at an early stage, is inexpensive, and can perform safe evacuation operations.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional side view of the main part of an elevator showing one embodiment of the fire detection device for elevators according to this invention, and Fig. 2 is a side view of the main part of the elevator.
FIG. 3 is a logic circuit diagram explaining the operation of the diagram. 1... Hoistway, 2... Landing, 3...
... Lifting body, 4... Counterweight, 5...
...Fire detector, 6...Fire signal, 7...
...Normal signal, 8...Storage device, 9...
...Evacuation descending signal, 10...Descent movement signal, 1
1...Evacuation floor signal, 12, 13...AND gate, 14...OR gate, 15...
Evacuation stop signal, 16...control device.

Claims (1)

[Scope of utility model registration request] A fire detector is installed on the outer surface of the lifting body that moves up and down in the hoistway and operates by sensing the fire airflow rising in the hoistway. A fire detection device for elevators that detects when someone is above.