JP2005162442A - Elevator device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elevator device capable of judging at an early stage a capacity drop due to discharging of a storage battery for use when an elevator encounters a power interruption. <P>SOLUTION: A car 9 of this elevator device is elevated and lowered by supplying to a three-phase induction motor 6 the electric power of the three-phase commercial AC main 1 upon converting the electric power by an inverter 5 at normal times. When the AC main 1 goes in interruption, the power of the storage battery 22 charged by a charger 21 is converted by an inverter 28 and supplied to a control device 14, and also supplied to the inverter 5 through a contact 31 for operating the motor 6. At the end of charging the storage battery 22, the charger 21 stops charging the battery 22. A voltage detector 23 measures the voltage of the battery 22, while a CPU 15 judges the condition of the battery 22. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an elevator apparatus, and more particularly to an apparatus for operating an elevator in an emergency such as a power failure.

  When the supply of commercial power to the elevator is interrupted due to a power failure or an emergency stop command is issued for reasons other than the operation of the elevator safety device, the elevator car stops suddenly. At this time, if the car stops between the floors, the door cannot be opened and the passengers are trapped in the car. As a countermeasure, a DC power source such as a lead storage battery and an inverter device are used to output three-phase AC power to drive the elevator and drive the car to the nearest floor to rescue passengers.

  In a conventional emergency emergency landing device for an AC elevator, when an abnormality in the elevator is detected, an emergency power source battery power device that supplies a direct current by switching from a normal power source is supplied from the battery power source device. Converts direct current to alternating current to drive an alternating current motor and drives an elevator to and from the elevator, and controls the direct current / alternating current converter to operate to a predetermined designated floor where evacuation can be easily performed. Control means for emergency operation to be performed, and landing means for detecting arrival at the designated floor, landing the elevator car, and opening the door (for example, see Patent Document 1) ).

Japanese Patent Laid-Open No. 2-198994 (Claims, Fig. 1)

In the conventional emergency elevator landing apparatus for an AC elevator as described above, the appearance, charging voltage, capacity, and the like of the storage battery are checked by periodic inspection, but there are still the following problems.
(1) It is difficult to determine from the outside whether the capacity of the storage battery has decreased or the electrode plate has deteriorated.
(2) Since the life of the storage battery varies depending on the ambient temperature and use conditions (the number of discharges, the depth of discharge, etc.), it is extremely difficult to uniformly determine the replacement period for all elevators.

  (3) Even if it is determined that the storage battery is normal during regular maintenance and inspection due to the reason (2) above, depending on the number of discharges and the depth of discharge, the rescue operation can be performed until the next maintenance and inspection. May become impossible. This is because constant charge is always performed, so sufficient time is always required to perform the charge sufficient to compensate for the amount of discharge once. In normal charge, continuous discharge or discharge with a large depth is required. This is because the capacity is reduced.

  (4) In order to eliminate the problems as described above and improve the reliability, shortening the replacement cycle of the storage battery or shortening the periodic maintenance inspection cycle increases the maintenance cost.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide an elevator apparatus that can be operated with high safety even in an emergency.

  The elevator apparatus according to the present invention switches the power supply during normal operation to a storage battery in an emergency, detects the voltage of the storage battery with a voltage detector, and determines the state of the storage battery based on the detected storage battery voltage. It is a thing.

  In this invention, when the voltage drop of the storage battery is detected, the capacity of the storage battery is determined based on this, so that the capacity reduction of the storage battery can be determined early.

Embodiment 1 FIG.
1 and 2 are diagrams showing an embodiment of the first and second inventions of the present invention. FIG. 1 is an overall configuration diagram, and FIG. 2 is a curve diagram showing a relationship between a storage battery voltage and a discharge time.

  In FIG. 1, a converter 3 that converts an AC voltage into a DC voltage is connected to a commercial three-phase AC power source 1 via an electromagnetic contactor contact 2 that is closed during normal running of an elevator. A smoothing capacitor 4 is connected to the DC side of the converter 3, and an inverter 5 that converts a DC voltage into a three-phase AC of variable voltage / variable frequency is connected to both ends thereof. A three-phase induction motor 6 for driving the elevator is connected to the AC side of the inverter 5 and a current detector 7 for detecting the current of the motor 6 is provided.

A driving sheave 8 of the hoisting machine is coupled to the electric motor 6 and is coupled so as to raise and lower the car 9 and the counterweight 10.
The AC power supply 1 is connected to the power supply side of the control transformer 12 through a power supply disconnecting contact 11 (normally closed and opened in an emergency) (relay circuit is omitted). A control power supply device 13 is connected to the load side of the control transformer 12. A control device 14 is connected to the control power supply device 13.

A CPU 15 and a driving device 16 are connected to the control device 14, and the driving device 16 is connected to the inverter 5, the CPU 15 and the current detector 7. The CPU 15 is also connected to a display 17 on the operation panel in the car installed in the car 9 and a display 18 installed on the landing.
The commercial single-phase AC power supply 20 is connected to the power supply side of the charging device 21, and the charging device 21 is connected to the CPU 15.

  The load side of the charging device 21 is connected to the storage battery 22, and a voltage detector 23 is connected to both ends of the storage battery 22. A current detector 24 is inserted in the circuit of the storage battery 22, and the voltage detector 23 and the current detector 24 are connected to the CPU 15 via an A / D converter 25 that converts an analog value into a digital value. . An emergency control device 26 is connected to both ends of the storage battery 22, and the control device 26 is connected to the control power supply device 13 via a power failure detection device 27 that detects a power failure / failure.

  Connected to the load side of the control device 26 is a DC side of an inverter 28 that converts a DC voltage into a three-phase AC voltage having the same frequency as the AC power supply 1, and a booster that boosts the output voltage to the voltage of the AC power supply 1 on the AC side. A transformer 29 is connected. The load side of the step-up transformer 29 is connected to the primary side of the control transformer 12 via a normally open contact 30 of a control power supply switching relay (not shown) that is energized by the power of the storage battery 22 in an emergency. . Further, the DC side of the converter 3 and the storage battery 22 are connected via a normally open contact 31 of a main circuit power supply switching electromagnetic contactor (not shown) that is energized by the storage battery 22 in an emergency.

Next, the operation of this embodiment will be described.
In normal operation, the contact 2 is closed during traveling, and the three-phase AC voltage of the AC power source 1 is converted into a DC voltage by the converter 3, smoothed by the smoothing capacitor 4, and supplied to the inverter 5. On the other hand, the AC power supply 1 is stepped down to a control voltage by a control transformer 12 via a contact 11 and supplied to a control device 14 via a control power supply device 13. The drive device 16 operates according to the current value of the electric motor 6 that is the output of the control device 14 and the output of the current detector 7 to control the inverter 5.

  Thus, the inverter 5 converts the input direct current into a three-phase alternating voltage of variable voltage / variable frequency, drives the electric motor 6, and controls its rotational speed. By driving the electric motor 6, the driving sheave 8 rotates, and the car 9 and the counterweight 10 are raised and lowered alternately.

Next, the operation at the time of power failure will be described.
Now, assuming that the AC power supply 1 has a power failure, the power failure detection device 27 detects this and outputs a power failure detection signal to the control device 26. Thereby, each said electromagnetic contactor and a relay are deenergized or energized, the contacts 2 and 11 open, and the contacts 30 and 31 close. Here, the inverter 28 is activated, and the DC voltage of the storage battery 22 is converted into a three-phase AC voltage having the same frequency as that of the AC power supply 1, boosted to the commercial voltage by the step-up transformer 29, and controlled via the contact 30. 12 is supplied to the power supply side.

  Thus, the control power supply by the storage battery 22 is supplied from the control power supply device 13 to the control device 14, the CPU 15, and the drive device 16 to control the inverter 5, as in normal times. On the other hand, the electric power of the storage battery 22 is supplied to the inverter 5 through the contact 31 and is controlled by the driving device 16. Thus, the electric motor 6 is driven and the car 9 starts the rescue operation. The storage battery 22 is charged by the AC power supply 20 via the charging device 21.

Next, the discharge state of the storage battery 22 will be described with reference to FIG.
In the figure,
VCH: charging voltage value VH: first voltage reference value VM: second voltage reference value indicating a capacity decrease of the storage battery 22 VL: minimum allowable voltage value It is well known that the voltage of the storage battery 22 decreases within a predetermined time due to electrode deterioration, free discharge, or the like.

  Now, the storage battery 22 is charged from the AC power supply 20 via the charging device 21 as described above. When the fully charged state is detected from the charging current value by the voltage detector 23 and the current detector 24 during charging, a signal is output to the CPU 15 via the A / D converter 25. Thus, the CPU 15 issues a command to the charging device 21, the charging device 21 stops charging the storage battery 22, and the charging device 21 and the storage battery 22 are electrically separated. Moreover, the voltage detector 23 measures the voltage of the storage battery 22, and this value is memorize | stored in CPU15.

  For example, if a voltage value at a time TOK after a certain time from a certain time TO is measured and the voltage value is equal to or higher than the first voltage reference value VH, there is no problem in determining the life and the first voltage reference value VH to the second voltage reference value VM. If it is between, it is in a slightly deteriorated state, if it is between the second voltage reference value VM and the minimum allowable voltage VL, the replacement time is approaching, and if it is below the minimum allowable voltage VL, replacement is necessary for life judgment Judge.

  That is, the CPU 15 having a function as a determination unit determines the capacity of the storage battery 22 using predetermined voltage reference values VH, VM, VL and time TOK as determination values. Here, the first voltage reference value VH is a reference value determined from the capacity of the storage battery 22, and the minimum allowable voltage VL is a reference value at which the rescue operation can be performed a minimum number of times. Further, when it is determined that the capacity of the storage battery 22 is reduced, the result is displayed on the indicator 17 in the car 9 or the indicator 18 at the landing in a short cycle. This operation is performed when the storage battery 22 is fully charged.

In addition, when the capacity | capacitance fall of the storage battery 22 is detected, after giving the display to replace | exchange, until the storage battery 22 is replaced | exchanged continuously, for example, without stopping the charging device 21, the storage battery 22 is fully charged. Continue to maintain the standby state.
Thus, when the voltage drop of the storage battery 22 is detected, since the capacity | capacitance of the storage battery 22 is determined based on this, it becomes possible to determine the capacity | capacitance fall of a storage battery at an early stage. In addition, it is possible to determine an appropriate replacement time for the storage battery, reduce maintenance costs, and reliably perform the rescue operation even when the storage battery is deteriorated.

Embodiment 2. FIG.
FIG. 3 is a curve diagram showing the relationship between the storage battery voltage and the discharge time according to one embodiment of the present invention. FIG. 1 is also used in the second embodiment.
In this embodiment, as in the first embodiment, the voltage of the storage battery 22 separated from the charging device 21 is detected by the voltage detector 23, and the voltage value at the time TOK after a certain time from the certain time TO is measured. Then, these are classified into voltage level values of several stages (here, 10 stages) set in advance, and displayed on the display 17 in the car 9 or the display 18 of the hall in a short cycle.

  In this way, since the voltage level value of the storage battery 22 is displayed in a short cycle, it is possible to always determine the capacity decrease of the storage battery 22 and to operate at the time of a power failure by the storage battery 22 without waiting until regular maintenance. Is possible.

Embodiment 3 FIG.
4 and 5 are voltage level value setting diagrams showing an embodiment of the fourth invention of the present invention. FIG. 1 is also used in the third embodiment.
In this embodiment, as in the first embodiment, the voltage of the storage battery 22 separated from the charging device 21 is detected by the voltage detector 23, and as shown in FIG. 4, a fixed time (TO in FIG. 2) Then, the time TOK after a certain time is changed according to the temperature condition, and the correction time TOK (L) or TOK (H) is set. And the voltage value of this correction time TOK (L) or TOK (H) is measured, and the result of the judgment value based on the preset voltage reference value is displayed on the display unit 17 or the display unit 18.

Further, as shown in FIG. 5, the voltage value at a time TOK after a certain time from a certain time is measured, and the first voltage reference value VH and the minimum allowable voltage value VL are changed according to the temperature condition, and the corrected first Voltage reference values VH (H), VH (L) and corrected minimum permissible voltage values VL (H), VL (L) are obtained, and the results of judgment values based on these are displayed on the display 17 or the display 18. is there.
In this way, since the capacity determination reference value of the storage battery 22 is corrected according to the temperature condition, it is possible to determine the capacity decrease of the storage battery 22 at an early stage without being influenced by the environment of temperature change.

BRIEF DESCRIPTION OF THE DRAWINGS The whole block diagram which shows Embodiment 1-3 of this invention. The relationship curve figure of the storage battery voltage and discharge time which show Embodiment 1 and 2 of this invention. The relationship curve figure of the storage battery voltage and discharge time which shows Embodiment 2 of this invention. The voltage level value setting figure which shows Embodiment 3 of this invention. The voltage level value setting figure which shows the other example of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Commercial three-phase alternating current power supply, 2 Magnetic contactor contact, 5 Inverter, 6 Three-phase induction motor, 9 cage, 11 Power-release relay contact, 15 CPU, 16 Drive, 17, 18 Display, 20 Commercial single-phase alternating current power supply , 21 Charging device, 22 Storage battery, 23 Voltage detector, 24 Current detector, 27 Power failure detection device, 28 Inverter, 30 Control power switching relay contact, 31 Main circuit power switching electromagnetic contactor contact.

Claims (4)

  In an elevator operated by switching the power source during normal operation to a storage battery in an emergency, a voltage detector that detects the voltage of the storage battery, and a determination unit that determines the state of the storage battery based on the detected voltage of the storage battery An elevator apparatus characterized by comprising.   In an elevator that has a storage battery connected to the charging device and operates by switching the power supply during normal operation to the storage battery in an emergency, the voltage detector that detects the voltage of the storage battery and charging from the charging current value of the storage battery When it is detected that the storage battery has expired, separation means for electrically separating the storage battery from the charging device, and determination means for determining the state of the separated storage battery based on the voltage of the detected storage battery An elevator apparatus characterized by comprising.   3. The elevator apparatus according to claim 2, further comprising display means for displaying a result of the storage battery in the car or the hall after the determination of the state of the storage battery by the determination means.   The elevator apparatus according to claim 2, wherein the determination means corrects the reference value of the determination according to the temperature state when determining the separated storage battery state.

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