JPH04243785A - Elevator - Google Patents

Abstract

PURPOSE:To provided an elevator having the capability of closing a cage door and permitting a passenger to escape to another floor, when he/she tries to close the door and escape upon occurrence of a fire, regardless of a photoelectric sensor so fitted as to operate on fumes for preventing the door from closing. CONSTITUTION:An exhaust and ventilation fan 17 for discharging fumes 16 is fitted to the inside of a cage 7, and a cage door is closed after the predetermined time of fume discharge. When the amount of the fumes 16 is too much to be discharged even after the predetermined time, the cage door is closed with the operation of a circuit to invalidate a door opening instruction from a photoelectric sensor 1.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator equipped with a door safety device using an optical sensor.

0003

[Prior Art] Normally, elevators are equipped with a mechanical safety mechanism as a car door safety device in which a limit switch is activated by a light press. As shown in the circuit, this optical sensor 1 and the door open command relay 2 are connected in series between the control power supply PN, and when the optical sensor 1 detects an object, the car door is restarted, thereby providing a non-contact system. Many are additionally equipped with a door safety device that detects objects.

By the way, when a fire breaks out inside a building equipped with an elevator, evacuees often have no choice but to use the elevator instead of using the emergency stairs.

[0005]

[Problem to be Solved by the Invention] However, when evacuating using this elevator, the smoke that fills the building will also enter the car, so passengers inside the car may press the door close button and go to another floor. Even if they try to escape, the light sensor malfunctions due to the smoke, causing the door to open and close repeatedly.

At this time, if the door opening/closing circuit is equipped with a timer function, the door will close after a certain period of time;
If the door is not equipped with a timer function, the door will keep opening and closing over and over again, even though the moment is of the essence.
Time passes.

[0007] Therefore, after the passengers realize this, they will have to abandon the elevator and search for an emergency exit again to evacuate, and there is a risk that they will be unable to escape and be engulfed in smoke, resulting in a worst-case scenario.

On the other hand, some elevators have adopted a system in which the door safety device using an optical sensor is disconnected from the control circuit at the same time as a fire alarm is issued from the building in the event of a fire.
There is also a malicious prank that causes a door safety device using an optical sensor to malfunction, and in such cases, the door safety device using an optical sensor must be disconnected for building management reasons, so it must be done manually from the building side. Disconnecting the door safety device using an optical sensor is not only troublesome, but may also be forgotten.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to detect objects in an elevator equipped with a door safety device using an optical sensor without contacting the optical sensor, and to prevent passengers using the elevator to evacuate in the event of a fire. The objective is to provide an elevator that increases the safety of evacuees by allowing the doors to be closed even when smoke enters the elevator. [Structure of the invention]

0010

[Means for Solving the Problems] The present invention provides an elevator equipped with a door safety device in which an optical sensor is provided in the car or the landing, and the operation of the optical sensor prevents the door from closing or reopens the closed door. , an elevator characterized in that a smoke detector and a smoke exhaust ventilation fan are provided inside the car, and a smoke exhaust ventilation fan drive circuit is provided that drives the smoke exhaust ventilation fan for a certain period of time based on a detection signal from the smoke detector.

[0011]

[Function] Even if smoke from a fire that occurs in the building enters the car, the smoke detector detects this smoke and uses a time relay to drive the smoke exhaust ventilation fan for a certain period of time, suppressing the smoke inside the car. If the light sensor function works, the door can be closed and the car can be moved up and down.

On the other hand, if the amount of smoke is large and there is a limit to its discharge, and the door cannot be closed even after a certain period of time has elapsed, the door close command relay 2 is deenergized by the detection signal from the smoke detector. This eliminates the function of the optical sensor, so the door can be closed regardless of smoke intrusion, and the car can be moved up and down.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing the overall structure of an elevator according to the present invention.

In the figure, 3 is a hoistway, and 4 is an elevator machine room. In the hoistway 3, a hoisting machine 5 installed in the elevator machine room 4 and a car 7 that goes up and down via a main rope 6 are installed. It is provided. One end of the tail cord 8 is connected to the lower surface of the car 7, and the other end of the tail cord 8 is connected to a control panel 9 installed in the elevator machine room 4. At the bottom (pit) of the hoistway 3, there is a shock absorber 10 for the car 7 and a counterweight 11.
A shock absorber 12 is provided for each.

Further, the above-mentioned car 7 is equipped with an optical sensor 1 as in the conventional case, and a smoke detector 14 and a smoke exhaust ventilation fan 17 are attached to the interior ceiling or side panel. As will be described later, the detection signal is sent to the control panel 9 of the elevator machine room 4 via the tail cord 8, via the time relay 18 attached to the control panel 9, and then via the tail cord 8 again to the car. 7 is connected to a smoke exhaust ventilation fan 17 inside.

On the other hand, as shown in the door drive circuit of FIG. Connect in series with Furthermore, the time limit contact 21 of the time relay 18 is connected in parallel with the normally closed contact 15.

Next, as shown in the smoke exhaust ventilation fan drive circuit of FIG. It is connected in series between the control power supply PN, and from the junction of the normally open contact 19 of the time relay 18 and the time limit contact 20, it is connected between the control power supply PM in parallel with the smoke exhaust ventilation fan 17.

Next, the operation of the embodiment configured as above will be explained. When a fire breaks out in a building and smoke 16 enters the car 7 with the door open from the building side, the smoke detector 14 detects this smoke 16 and a relay combined with the smoke detector 14 is activated. (or switch) to operate,
The normally open contact 19 is closed and the normally closed contact 15 is opened.

Further, the time relay 18 operates and a closed circuit is formed between the time-limited contacts 20 and 21, so that the smoke exhaust ventilation fan 17 operates for a certain period of time to exhaust smoke and issue a door open command for the same period of time. Since the relay 2 is energized and the optical sensor 1 operates normally, there is no risk of the evacuee getting caught in the door.

However, when there is a large amount of smoke, there is a possibility that the optical sensor 1 malfunctions, so the time contacts 20 and 21 of the time relay 18 are opened after a certain period of time.

As a result, the door open command relay 2 is deenergized and the contact signal to the door control circuit is canceled. Therefore, regardless of the operation of the optical sensor 1, if the door close button is pressed, the door can be closed with a door close command and the car 7 can be lowered (or raised), so that the evacuee can evacuate. Can be done.

[0022]

[Effects of the Invention] As explained above, according to the present invention, even if there is no command from the building side due to the detection of fire, or even if there is a command due to forgetting or making a mistake, the elevator alone can enter the car. After detecting smoke and initially discharging the smoke inside the car for a certain period of time to prevent poisoning, the door safety device using an optical sensor can be disconnected, so the original function of object detection using an optical sensor can be removed. An elevator can be obtained in which passengers in the car can be evacuated without damage.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of an elevator of the present invention.

FIG. 2 is a connection diagram showing the elevator door drive circuit of the present invention.

FIG. 3 is a connection diagram showing a drive circuit for a smoke exhaust ventilation fan of an elevator according to the present invention.

FIG. 4 is a connection diagram showing a conventional elevator door control circuit.

[Explanation of symbols]

1... Optical sensor, 2... Door open command relay, 7... Car, 14
...Smoke detector, 15...Normally closed contact of smoke detector, 16...Smoke, 1
7...Smoke exhaust ventilation fan, 18...Time relay, 19...Normally open contact of smoke detector, 20, 21...Time limit contact of time relay.

Claims (2)

[Claims] Claim 1: An elevator equipped with a door safety device that includes an optical sensor installed in a car or a landing, and that prevents a door from closing or reopens a closed door when activated by the optical sensor, wherein a smoke sensor is installed inside the car. 1. An elevator comprising a smoke exhaust ventilation fan and a smoke exhaust ventilation fan, and a smoke exhaust ventilation fan drive circuit that drives the smoke exhaust ventilation fan for a certain period of time based on a detection signal from the smoke sensor. 2. The elevator according to claim 1, further comprising a time limit circuit that disables a door opening command after a certain period of time when a smoke detector is activated.