JPS6023066B2 - Elevator emergency operation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for operating an elevator with an emergency generator.

In most buildings, a system is adopted in which when a power outage occurs, the elevators are operated by switching over to the building's built-in emergency generator.

Furthermore, according to the Fire Service Act, buildings meeting certain conditions are required to be equipped with an emergency elevator, and also to be provided with a backup power supply outside the emergency elevator. An alternator driven by a diesel engine is used as this backup power source, but because the engine brake absorption capacity is low, if the amount of electric power regenerated exceeds the allowable value during regenerative braking,
This has the disadvantage that the speed of the diesel engine becomes excessive and an emergency stop is required. Generally, other loads are connected to the generator in parallel, and part of the regenerated power is absorbed by these loads, but in some cases, such as in high-speed elevators, where large regenerative power is generated, or when dedicated to emergency elevators. If an emergency generator is installed and there is no other load, the capacity of the engine must be made extremely large to absorb the regenerated power.
Therefore, in order to improve this, it has been proposed to connect a resistor that consumes regenerative power in advance during regenerative braking, and one example of this is disclosed in Tokokukan Sho 50-1124123. FIG. 1 shows an elevator emergency operation device similar to the invention disclosed in the above publication. In the figure,
1 is a diesel engine, 2 is an emergency alternating current generator, 3 and 4 are syris power converters, 5 is an armature of a hoisting motor, 5a is also a pond pump, and 6 is a speedometer driven by armature 5. 7 is a mesh wheel driven by armature 5, 8 is a main element, 9 is a cage, 10 is a counterweight, 11 is a main circuit contactor contact, 12 is a speed command generator, 13 is an ignition circuit ,
13a and 13b are the outputs of the thyristor converters 3 and 4.
15 is a regeneration discrimination circuit, 15a is its output, 16 is a resistor input circuit in which a thyristor and a diode are connected in anti-parallel to each phase of the output of the emergency generator 2, 1
7 is a regenerative power consumption resistor connected to each phase of the resistor input circuit 16, and 18 is a current detector.

The AC power of the emergency alternator 2 is supplied to the thyristor converter 3.
, 4 is converted into direct current and supplied to the armature 5.

As a result, the car 9 is driven via the mesh sheave 7. The output of the speed command generator 12 and the output of the speedometer generator 6 corresponding to the speed of the car 9 are compared, and based on the calculation result of the deviation and the output of the current detector 18, the ignition circuit 13 is turned on. An arc signal 13a or a firing signal 13b is generated. The circuit shown in the figure is called a non-circulating current static Leonard device, in which only one of the two thyristor converters 3, 4 is fired, and the other is not fired. Now, when the car 9 is running, assuming that the terminal voltage of the armature 5 has the polarity shown in the figure, a firing signal 13b is sent to the thyristor converter 4 during power running, and a firing signal is sent to the thyristor converter 3 during regenerative braking. 13a
will be sent.

If the polarity of the voltage across the armature 5 is opposite to that shown in the drawing, the above will be reversed in all cases. The polarity of the terminal voltage of armature 5 is
The running direction of the vehicle, that is, the output of the speed command generator 12, is determined by the polarity. Therefore, depending on the polarity of the output of the speed command generating device 12 and which of the ignition signals 13a and 13b the ignition circuit 13 is emitting, it is possible to easily determine whether power running or regenerative braking is being performed. The regeneration discrimination circuit 15 detects this, and during power running, the output 15a
is not emitted, and the output shaft 5a is emitted during regenerative braking. The resistor input circuit 16 is made conductive by the output 15a of the regenerative discrimination circuit 15, and the regenerative power consumption resistor 17 is connected to the thyristor converter 3, 4.
It is followed by the generator 2 in parallel with either of the following. In this way, a circuit that consumes regenerative power only during regenerative braking is connected. However, emergency operation using an emergency generator is rarely performed.

Nevertheless, the resistor closing circuit 16 and the regenerative power consumption resistor 17 must be provided in preparation for this emergency operation, which is expensive. Furthermore, if regenerated power is not absorbed, the car decelerates slowly, and may not stop at the specified position, or
There are also safety problems at the terminal floors, such as ups and downs. For this reason, there was a drawback that the resistor closing circuit 16 and the regenerative power consumption resistor 17 had to be kept in a normal state at all times, which required a lot of maintenance.The present invention aims to improve the above drawback, and A predetermined number of elevators are operated with emergency generators, others are stopped, and the regenerated power is consumed by the elevators that are out of service.In other words, the equipment used for normal operation is used for regeneration. It is an object of the present invention to provide an emergency operation device for an elevator that consumes less power and is inexpensive and requires less maintenance. Fig. 2 shows an embodiment of the present invention.

In this embodiment, there are two elevators, and in the figure, the one with A at the end of the code is for the A machine, and the one with B is for the B machine. In the figure, "20A and 208 are the friction type brakes of cars A and B. When the cars 9A and 9B are started, they are released to release the net wheels 7A and 78, and after they have stopped, they are activated to release the net wheels 7A and 78.
7B is configured to be restrained.

It is now assumed that the A machine is being operated by the emergency generator 2, the brake 20A is released, and the B machine is resting after returning to the standard floor and closing the door. Therefore, at this time, the brake 208 restrains the silk wheel 7B. As in the case of Fig. 1, when the A machine enters regenerative braking, the output 15a of the regenerative discrimination circuit turtle 5 operates the ignition circuit 3B, and the thyristor converter 3B (thyristor converter 4B
But that's fine.

) is ignited, and the regenerated power flows into the armature 5B of the B machine. Generally, the friction brake 20B is designed to generate enough braking torque to maintain the car even when 150% of the passenger capacity is loaded in the car 9B. Further, the weight of the counterweight 1OB is equal to the total weight of the car 9B when 50% of its capacity is loaded with passengers. Therefore, when car 9B is under no load, car SB does not move even if a downward current equivalent to 300% of the rated torque is passed through armature 58. However, “it only takes 100 steps upwards.
It operates with a current of about %. Therefore, when attempting to absorb large regenerative power, it is advantageous to send the output 15a of the regenerative discrimination circuit 15 to a thyristor converter (here, this is assumed to be the thyristor converter 3B) that flows a downward current. . If more current is applied, car 9B will move, which is inconvenient, but since the current limiter (not shown) of unit B is normally set to a current equivalent to 300% of the rated torque, car 9B will move. Never. Further, the temperature of the armature 5B increases by absorbing the regenerated power, but when the motor is of a forced draft type, the temperature of the armature 5B does not rise abnormally with this level of current. If the regenerative power absorption capacity is insufficient, a resistor may be connected in parallel with the armature 5B only when the emergency generator 2 is used. That is, in this embodiment, in place of the resistor 17 shown in FIG. 1, the armature 5B of the idle machine is used to absorb regenerated power. As described above, this invention is an emergency operation device for elevators that operates a predetermined number of elevators and suspends the others. The device, which is said to be consuming electricity by supplying brakes to the motors of idle elevators, can now be used for emergency operations, making it possible to construct it at a low cost, and making it easier to use. The device is always used in normal operation, and as a result of this use, abnormalities in the device can be monitored, so that a highly reliable emergency operation device can be obtained with the maintenance normally performed on elevators.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional elevator emergency operation device, and FIG. 2 is a block diagram showing an embodiment of the present invention. 1... Diesel engine, 2... Emergency alternator, 3, 4... Thyristor converter, 5...
Hoisting motor armature, 6... Speedometer generator, 7
... Net wheel, 9 ... Basket, 12 ...
...Speed command generator, 13...Ignition circuit, 1
5... Regenerative discrimination circuit, 16... Resistor input circuit, 17... Resistor for regenerative power consumption, ]8...
...Current detector, 20...Brake. Note that the same parts in the figures are indicated by the same reference numerals. Illustration doll

Claims (1)

[Claims] 1. The drive motors of a plurality of elevators are each connected to an emergency generator via a non-circulating current static Leonard device controlled by an ignition circuit, and the emergency generator is In an apparatus in which a predetermined number of the elevators are operated by electric power and the others are stopped, the regenerative power of the operating electric motor is calculated by calculating the signal of the ignition circuit and the running direction of the car or the polarity of the electric motor. A regenerative discrimination circuit to detect, and a regenerative power consumption that operates the ignition circuit of the inactive elevator based on the detection signal of the regenerative discrimination circuit, and supplies the regenerative power to the inactive motor that is restrained by the brake. Elevator emergency operation device equipped with a circuit. 2. The ignition circuit operated by the detection signal of the regeneration discrimination circuit controls the stationary Leonard device so as to cause the motor at rest to generate a torque in the direction of lowering the car. Elevator emergency operation device.