Elevator with water level detection sensor

Abstract

To provide an elevator capable of stopping the elevation of a car without immersing the car in water and notifying a person of a possibility that a car may be stopped before the elevation of the car is stopped.SOLUTION: An elevator 10 includes a control panel 19 that performs control for driving a pump 30 to discharge water to outside a hoistway 20 from a pit 21 when receiving a first signal showing that water reaches a first water level from a water level detection sensor 29, performs control for making a notification unit give information that a person can recognize a possibility where a car 5 may be stopped automatically when receiving a second signal showing that water reaches a second water level higher than the first water level, and performs control of stopping the elevation of the car 5 under the condition where the car 5 is positioned at least at a floor where is higher than a lowermost floor for one or more stories when receiving a third signal showing that water reaches a third water level higher than the second water level.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an elevator equipped with a water level detection sensor. [Background technology]

[0002] Conventionally, there is an elevator described in Patent Document 1. This elevator is equipped with first, second and third water flood detectors that detect when the water accumulated in a pit of a hoistway reaches a predetermined water level and operate in the first, second and third order when the pit is flooded, and a pump for discharging the water accumulated in the pit. This elevator is configured to drive the pump motor when the second water flood detector operates, stop the pump motor when the water in the pit decreases and the first water flood detector becomes inoperative, and control the elevator so that the car does not stop at the lowest floor when the third water flood detector operates. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 63-45758 Summary of the Invention [Problem to be solved by the invention]

[0004] In the event of a flood or other event that causes a large amount of water to accumulate in the pit, it is preferable from a safety standpoint to have the car stationary. Furthermore, in such a case, if it were possible to inform people in advance that the elevator may be shut down before the water exceeds the allowable amount in the pit, this would provide people with a sense of security and would be extremely meaningful in that it would greatly reduce the risk of people becoming trapped in the car.

[0005] Therefore, the object of the present disclosure is to provide an elevator that, when a large amount of water accumulates in the pit, can halt the lifting and lowering of the car without the car being submerged in water, and further, can inform people that the lifting and lowering of the car may be halted before the lifting and lowering of the car is halted. [Means for solving the problem]

[0006] In order to solve the above problems, the elevator of the present disclosure includes a car that moves up and down in a hoistway, a water level detection sensor that is provided in a pit of the hoistway and is capable of detecting three or more different water levels, a pump for discharging water accumulated in the pit out of the hoistway, and an alarm unit that is provided in at least one of the car and the landing and issues an alarm that a person can recognize to the effect that the car may automatically stop. A control device that, when it receives a first signal from the water level detection sensor indicating that water has reached a first water level, controls the pump to be driven to discharge water from the pit to the outside of the hoistway, when it receives a second signal from the water level detection sensor indicating that water has reached a second water level that is higher than the first water level, controls the alarm unit to issue the alarm, and further, when it receives a third signal from the water level detection sensor indicating that water has reached a third water level that is higher than the second water level, controls to pause the ascent and descent of the car when the car is located at a height that is at least one floor higher than the lowest floor.

[0007] In this specification, the pit is defined as an area of ​​the elevator shaft that exists in the height range from the bottom end of the car to the bottom of the elevator shaft when the car stops at the lowest floor.

[0008] According to the present disclosure, when the control device receives a first signal from the water level detection sensor indicating that the water has reached a first water level, the control device drives a pump to discharge the water from the pit to the outside of the elevator shaft. Therefore, when the amount of water accumulated in the pit is small, the water can be automatically pumped out of the pit to the outside of the elevator shaft without stopping elevator operation. Also, even if the amount of water that has flooded the pit is large and the elevator has to be temporarily stopped, the elevator can be quickly restored to operation.

[0009] Furthermore, when the control device receives a third signal from the water level detection sensor indicating that the water has reached a third water level that is higher than the second water level that is higher than the first water level, the control device stops the raising and lowering of the car when the car is at a height that is at least one floor higher than the lowest floor. This prevents the car from continuing to rise and fall when a large amount of water has accumulated in the pit, causing the car to come into contact with the water accumulated in the pit. This prevents water from entering the car and prevents the car's electrical components, such as the connection terminals of the car that connect cables, from getting wet and damaging the car, thereby ensuring the safety of people using the car.

[0010] Furthermore, when the control device receives a second signal from the water level detection sensor indicating that the water has reached a second water level, which is higher than the first water level and lower than the third water level, the notification unit executes a notification that allows a person to recognize the possibility that the car will automatically stop. Therefore, since the elevator will not suddenly stop without notice and the elevator stoppage is notified in advance, it is possible to prevent a situation in which a person feels psychological pressure due to the car suddenly stopping without notice.

[0011] In addition, when the control device receives the third signal, the control device may stop the car at a floor that is at least one floor higher than the lowest floor and is also the closest floor to the car, and then open the car door and the hall door at the car's stop floor. Alternatively, when the control device receives the third signal, the control device may always stop the car at a floor that is one floor higher than the lowest floor, and then open the car door and the hall door at the car's stop floor (in this case, the floor that is one floor higher than the lowest floor).

[0012] In addition, the notification unit may include at least one of a voice output device that automatically outputs wording that a person can recognize as indicating that the cage may stop automatically, and a display device that displays the wording.

[0013] According to the above configuration, it is possible to reliably inform people using the elevator that the car may automatically stop.

[0014] In addition, the notification unit may include the audio output device, and the audio output device may output the text by automatic voice at predetermined time intervals while the water level remains at or above the second water level and below the third water level.

[0015] The above-mentioned predetermined time period includes 0 hours.

[0016] According to the above configuration, while the water level remains at or above the second water level and below the third water level, a message that a person can recognize as meaning that the car may stop automatically is repeated. This makes it possible to reliably inform elevator users by voice that the car may stop automatically.

[0017] In addition, the water level detection sensor and the pump may be configured to receive power from an external power supply source, and an emergency power supply may be provided to supply power to the water level detection sensor when the water level detection sensor is unable to receive power from the power supply source.

[0018] According to the above configuration, even if the power supply from the external power source to the water level detection sensor is cut off, the emergency power supply supplies power to the water level detection sensor, so that the water level of the water in the pit can be reliably detected.

[0019] The emergency power supply may also be configured to supply power to the pump when the pump is unable to receive power from the power supply source.

[0020] According to the above configuration, even if the power supply from the power source to the pump is cut off during flooding, the water accumulated in the pit can be discharged outside the elevator shaft using power from the emergency power source.

[0021] The elevator may also be provided with a capacity detection device that detects the remaining capacity of the emergency power source, and when the control device determines based on a signal from the capacity detection device that the remaining capacity has dropped to a second remaining capacity that is equal to or greater than a first remaining capacity required to move the car from the bottom floor to the floor one floor higher, the control device may perform control to prohibit the emergency power source from supplying power to the pump.

[0022] When the power supply from the power source to the hoist motor is cut off, the power of the emergency power source may be supplied to the hoist motor. In such a case, by adopting the above-mentioned configuration, it is possible to prevent a situation in which the car cannot be parked on a floor one floor higher than the lowest floor.

[0023] In addition, when the control device determines that the remaining capacity has dropped to the second remaining capacity, it may land the car at a floor that is at least one floor higher than the lowest floor, and then open the car door and the landing door of the floor at which the car has landed, thereby halting the ascent and descent of the car.

[0024] According to the above configuration, it is possible to prevent the cage from being unable to be parked on a floor one or more floors above the lowest floor, to prevent the cage from being submerged in water, and further to prevent people from being trapped inside the cage when it is flooded.

[0025] In addition, after the lifting and lowering of the car has stopped, the control device may cause the notification unit to issue a notification to the effect that the lifting and lowering of the car has stopped.

[0026] According to the above configuration, passengers can recognize that the elevator car is not moving up or down, and can quickly take appropriate action based on that recognition.

[0027] The emergency power supply may also supply power for raising and lowering the car when a power outage occurs.

[0028] Typically, elevators are equipped with an emergency power supply to supply power to the hoist motor and the car door opening and closing motor in the event of a power outage, so that the car can land at the nearest floor and open the car doors and hall doors.

[0029] According to the above configuration, the emergency power supply that has been provided for supplying power in the event of a power outage can be used as a power supply device that supplies power to the pump and the water level detection sensor in an emergency. Therefore, sensing by the water level detection sensor and the pumping operation of the pump in an emergency can be realized without much investment in new equipment.

[0030] In addition, the control device controls the motor of the hoist and the motor that opens and closes the car door based on a signal from a car call button installed at the landing and a signal from a destination floor designation button installed inside the car, and the emergency power supply may be set above the control device.

[0031] In an elevator, the control device that controls the motor for the hoist and the motor that opens and closes the car doors is the heart of the elevator and is responsible for the controls necessary for elevator operation, so it is generally installed in a location that will not be submerged in water. With this configuration, the emergency power supply can be easily and inexpensively installed in a location that is unlikely to be submerged in water. Effect of the Invention

[0032] According to the elevator of the present disclosure, in the event that a large amount of water accumulates in the pit, the lifting and lowering of the car can be halted without the car being submerged in water, and further, people can be informed that the lifting and lowering of the car may be halted before the lifting and lowering of the car is halted. [Brief description of the drawings]

[0033] [Figure 1] FIG. 1 is a schematic diagram illustrating the configuration of an elevator according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a block diagram illustrating the control executed by the control panel of the elevator. [Diagram 3]FIG. 2 is a front view of the water level detection sensor of the elevator as viewed from the front. [Figure 4] 3A to 3C are schematic diagrams illustrating the principle by which the water level detection sensor detects the water level. [Diagram 5] 5 is a flowchart illustrating an example of a typical control of a control panel in a state in which an emergency power supply is not operating. [Figure 6] 13 is a flowchart illustrating an example of a typical control of the control panel when the emergency power supply is activated and supplies power to each device in the elevator when the pit is flooded. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] Hereinafter, the embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. In addition, when multiple embodiments and modified examples are included below, it is assumed from the beginning that new embodiments will be constructed by appropriately combining the characteristic parts of those. In addition, in the following examples, the same components are given the same symbols in the drawings, and duplicated explanations are omitted. In addition, multiple drawings include schematic diagrams, and the dimensional ratios of length, width, height, etc. of each member between different drawings do not necessarily match. In addition, among the components described below, components that are not described in the independent claim showing the highest concept are optional components and are not essential components. In addition, when the word "approximately" is used in this specification, it is used in the same sense as the word "roughly speaking", and the requirement of "approximately ~" is met if a person looks roughly ~. For example, the requirement of approximately circular is met if a person looks roughly circular. In addition, in this specification, the pit 21 is defined as an area of ​​the elevator shaft 20 that exists in the height range from the lower end of the car 5 to the bottom of the elevator shaft 20 when the car 5 stops at the lowest floor.

[0035] FIG. 1 is a schematic diagram illustrating the configuration of an elevator 10 according to an embodiment of the present invention. As shown in FIG. 1, the elevator 10 includes a car 5, a wire rope 11, a counterweight 12, a hoist 13, a first pulley 14, a second pulley 15, a third pulley 16, a fourth pulley 17, a fifth pulley 18, and a control panel 19 as a control device. The car 5 is disposed in a hoistway 20 extending in the vertical direction Z in a building, and the hoist 13 and the control panel 19 are provided in a pit 21 located at the bottom of the hoistway 20. The first pulley 14 and the second pulley 15 are installed on the ceiling of the hoistway 20 with a gap therebetween in the X direction, which is the depth direction of the hoistway 20. The third pulley 16 is attached to the counterweight 12 disposed in the hoistway 20, and the fourth pulley 17 and the fifth pulley 18 are installed at a gap therebetween in the X direction at one end and the other end of the X direction under the car. In Figure 1, an example of a machine room-less elevator in which the hoist 13 and control panel 19 are installed in the pit 21 is used, but the elevator may also be an elevator in which the hoist and control panel are installed in a machine room located at the top of the hoistway. One end of the wire rope 11 is fixed to the ceiling of the hoistway 20. The wire rope 11 is wound from its one end around the fourth pulley 17, the fifth pulley 18, the first pulley 14, the hoist 13, the second pulley 15, and the third pulley 16 in this order, and the other end of the wire rope 11 is fixed to the ceiling of the hoistway 20 with a gap in the X direction from the one end of the wire rope 11. The weight of the counterweight 12 is set so as to be balanced with the car 5 connected to the counterweight 12 via the wire rope 11. The control panel 19 receives signals from a car call button 38 provided at the landing of each floor for calling the car 5 and a destination floor designation button 39 provided in the car 5 for designating the destination floor. The control panel 19 controls the direction of rotation and the number of rotations of the hoist motor 13a of the hoist 13 based on these signals, so that the car 5 rises and falls. The elevator 10 further includes a car-inside voice output device 25, a car door opening / closing motor 26, a car-inside display unit 27, a hall voice output device 28, a water level detection sensor 29, a pump 30, an emergency power supply 31, and a capacity detection device 32. The car-inside voice output device 25, the car-inside display unit 27, and the hall voice output device 28 constitute an alarm unit, and the car-inside voice output device 25 and the hall voice output device 28 constitute a voice output device. The elevator 10 includes a communication device that is installed in the car 5 and allows a person in the car 5 to communicate with a person in a disaster prevention center or the like in an emergency. The communication device may be used as the car-inside voice output device 25, or may be provided in the car 5 separately from the communication device. The car-inside voice output device 25 includes an car-inside voice generation unit that generates a synthetic sound, and an car-inside speaker electrically connected to the car-inside voice generation unit. The in-car voice generating unit generates a synthetic sound according to a control signal from the control panel 19, and the generated synthetic sound is output from the in-car speaker. The in-car voice output device 25 is used to convey information by voice to people in the car 5.

[0036] The car door opening / closing motor 26 is a motor for opening and closing the car door, and the rotation direction and the number of rotations are controlled by a control signal from the control panel 19, thereby opening and closing the car door 41. The landing door 42 installed on each floor is configured to open and close in conjunction with the opening and closing operation of the car door 41. The car interior display unit 27 is installed in the car 5. The car interior display unit 27 is composed of a display device capable of displaying text, for example, a liquid crystal panel or an organic EL panel. The car interior display unit 27 is installed in a location that is easily visible, such as above the destination floor designation button 39 in the car 5. The car interior display unit 27 displays text based on a control signal from the control panel 19. The landing sound output device 28 is installed, for example, above the landing door 42 of the landing on each floor. The landing sound output device 28 includes a landing sound generation unit that generates a synthetic sound, and a landing speaker electrically connected to the landing sound generation unit. The hall voice generating unit generates a synthetic sound according to a control signal from the control panel 19, and the generated synthetic sound is output from the hall speaker. The hall voice output device 28 is used to convey information by voice to people at the hall.

[0037] The water level detection sensor 29 is installed in the pit 21 below the elevator shaft 20, and detects the level of the water accumulated in the pit 21. The water level detection sensor 29 detects three different water levels, specifically, a first water level, a second water level higher than the first water level, and a third water level higher than the second water level. When the water level detection sensor 29 detects a water level equal to or higher than the first water level, it outputs a first signal indicating that the first water level has been detected to the control panel 19, and when the water level detection sensor 29 detects a water level equal to or higher than the second water level, it outputs a second signal indicating that the second water level has been detected to the control panel 19. When the water level detection sensor 29 detects a water level equal to or higher than the third water level, it outputs a third signal indicating that the third water level has been detected to the control panel 19. The structure of the water level detection sensor 29 will be described in detail below with reference to FIG. 3 and FIG. 4.

[0038] The pump 30 is controlled to be driven or stopped based on a signal from the control panel 19. When the pump 30 is driven, the water accumulated in the pit is pumped out of the elevator shaft 20 and discharged. The emergency power supply 31 is installed, for example, on the upper end surface of the control panel 19. The emergency power supply 31 may be composed of, for example, a secondary battery, and in this case, may be composed of a lead-acid battery, a nickel-cadmium battery, a metal lithium battery, a lithium-ion battery, or the like. The emergency power supply 31 has a control circuit housed in the generator panel for automatically starting when the power supply from an external power supply source 77 (see FIG. 2) composed of a commercial power source or the like is stopped due to a ground fault, a power outage, or the like, and automatically stopping when the power is subsequently restored. The emergency power supply 31 supplies power to the water level detection sensor 29 when the water level detection sensor 29 is no longer able to receive power from the external power supply source 77, and supplies power to the pump 30 when the pump 30 is no longer able to receive power from the external power supply source 77.

[0039] The elevator 10 is equipped with an emergency power supply for supplying power to the hoist motor and the car door opening / closing motor to land the car 5 at the nearest floor and open the car doors 41 and the hall doors 42 when the power supply from the external power supply source 77, such as a commercial power source, is stopped due to a power outage or electric leakage. This emergency power supply also has a control circuit housed in the generator panel for automatically starting when the power supply from the power supply source 77 is stopped and automatically stopping when power is subsequently restored.

[0040] In this context, such an emergency power supply may constitute the emergency power supply 31. Then, when the water level detection sensor 29 is unable to receive power from the external power supply source 77, or when the pump 30 is unable to receive power from the external power supply source 77, such an emergency power supply may supply power to the water level detection sensor 29 or to the pump 30.

[0041] The capacity detection device 32 detects the remaining capacity of the emergency power supply 31 and outputs a signal indicating the remaining capacity to the control panel 19. The capacity detection device 32 detects the remaining capacity of the emergency power supply 31 (energy capacity remaining in the battery). The capacity detection device 32 may have any structure capable of detecting the remaining capacity of the emergency power supply 31. For example, the capacity detection device 32 may include a battery remaining capacity meter IC (integrated circuit). The battery remaining capacity meter IC is a semiconductor chip that measures the energy capacity remaining in the secondary battery. The battery remaining capacity meter IC may be any of a voltage measurement type, a coulomb counter type, a battery cell modeling type, and an impedance track type. For example, when a voltage measurement type is adopted as the battery remaining capacity meter IC, the battery remaining capacity meter IC measures the terminal voltage of the battery to determine the remaining capacity. In general, the terminal voltage of a secondary battery is highest immediately after charging, and the terminal voltage decreases as the battery is discharged. A battery remaining capacity meter IC using the voltage measurement type utilizes the characteristics to determine the remaining capacity. The capacity detection device 32 may calculate the capacity and remaining amount based on the fluctuations in current and voltage caused by charging and discharging the secondary battery during use. The capacity detection device 32 may reduce errors in the remaining amount and capacity by combining an open circuit voltage method that uses voltage as an index to accurately measure the remaining amount, and a measurement method that uses current.

[0042] Fig. 2 is a block diagram for explaining the control executed by the control panel 19 of the elevator 10. As shown in Fig. 2, in the elevator 10, the control panel 19 is adapted to receive signals from a car call button 38, a destination floor designation button 39, a water level detection sensor 29, and a capacity detection device 32. In addition, the control panel 19 is adapted to output control signals to the hoisting machine motor 13a, the car interior voice output device 25, the car door opening / closing motor 26, the car interior display unit 27, the hall voice output device 28, and the pump 30, and to control these devices 13a, 25, 26, 27, 28, 30.

[0043] In detail, the control panel 19 has a computer, for example, a microcomputer, and includes a control unit 51 and a storage unit 52. The control unit 51, i.e., the processor, includes, for example, a CPU (Central Processing Unit). The control unit 51 has a hoist motor control unit 51a, a car door motor control unit 51b, a pump drive control unit 51c, a car display control unit 51d, a car voice control unit 51e, and a hall voice control unit 51f.

[0044] The hoist motor control unit 51a controls the rotation direction and the rotation speed of the hoist motor 13a, and the car door motor control unit 51b controls the rotation direction and the rotation speed of the car door opening / closing motor 26. The pump drive control unit 51c controls the drive or stop of the pump 30, and the car display control unit 51d controls whether or not to automatically display the text described below on the car interior display unit 27. The car voice control unit 51e controls whether or not to automatically output the text described below on the car interior voice output device 25, and the hall voice control unit 51f controls whether or not to automatically output the text described below on the hall voice output device 28.

[0045] On the other hand, the storage unit 52 is composed of a hard disk drive (HDD), a semiconductor memory, etc., and the semiconductor memory is composed of a non-volatile memory such as a ROM (Read Only Memory) or a volatile memory such as a RAM (Random Access Memory). The storage unit 52 may be composed of only one storage medium, or may be composed of a plurality of different storage media. The CPU reads out and executes programs and the like stored in advance in the storage unit 52. These programs include programs required for the control unit 51 to control the hoist motor 13a, the car interior voice output device 25, the car door opening and closing motor 26, the car interior display unit 27, the hall voice output device 28, and the pump 30. The storage unit 52 also stores in advance information that can identify the first to third water levels, information that can identify the time interval at which the voice output device, which will be described later, issues a notice, and information that can identify the second remaining capacity, which will be described later. The non-volatile memory also stores in advance a control program, a predetermined threshold value, etc. The volatile memory also temporarily stores the read program and processing data.

[0046] As described above, during normal operation of the elevator 10, the control panel 19 controls the direction and speed of rotation of the hoist motor 13a of the hoist 13 based on signals from the car call button 38 and the destination floor designation button 39, thereby controlling the raising and lowering operation of the car 5. Furthermore, when the control panel 19 determines that the car 5 has stopped at a predetermined landing position based on a signal from a floor landing sensor (not shown), it controls the direction and speed of rotation of the car door opening and closing motor 26 to open the car door 41 and the hall door 42, and closes the car door 41 and the hall door 42 when a car door closing button (not shown) in the car 5 is operated, etc.

[0047] Furthermore, when the control panel 19 receives a first signal from the water level detection sensor 29 indicating that the water has reached the first water level, it drives the pump 30 to control the discharge of water from the pit 21 to the outside of the elevator shaft 20, while when it determines from information from the water level detection sensor 29 that the water has fallen below the first water level, it stops the drive of the pump 30. Furthermore, when the control panel 19 receives a second signal from the water level detection sensor 29 indicating that the water has reached a second water level higher than the first water level, it causes the alarm section to issue an alarm that can be recognized by a person that the car 5 may automatically stop.

[0048] In detail, when the control panel 19 receives the second signal from the water level detection sensor 29, it causes the in-car voice output device 25 to automatically output a message that a person can recognize as indicating that the car 5 may automatically stop, and also causes the hall voice output device 28 installed at each floor hall to automatically output a message that a person can recognize as indicating that the car 5 may automatically stop, by voice. Furthermore, when the control panel 19 receives the second signal from the water level detection sensor 29, it causes the in-car display unit 27 to display a message that a person can recognize as indicating that the car 5 may automatically stop. Here, such a message may be, for example, "The pit is flooded. If the degree of flooding exceeds the allowable range, elevator operation will be temporarily suspended to ensure safety."

[0049] Furthermore, when the control panel 19 receives a third signal from the water level detection sensor 29 indicating that the water has reached a third water level higher than the second water level, the control panel 19 lands the car 5 on at least one floor higher than the lowest floor, and then causes the car door 41 and the hall door 42 to execute an opening operation. The elevator 10 may have a timer 48, and the control panel 19 may obtain information on the elapsed time from the timer 48. Then, while the water level remains at or above the second water level and below the third water level, the control panel 19 may cause the car audio output device 25 and the hall audio output device 28 to automatically output a message that a person can recognize as indicating that the car 5 may automatically stop at predetermined intervals.

[0050] In addition, if the power supply from the external power supply source 77 to the elevator 10 is cut off for some reason and the emergency power supply 31 supplies power to the elevator 10, the control panel 19, when judging based on a signal from the capacity detection device 32 that the remaining capacity has dropped to a second remaining capacity equal to or greater than the first remaining capacity required to move the car 5 from the lowest floor to the floor one floor above, performs control to prohibit the emergency power supply 31 from supplying power to the pump 30. In this case, when the control panel 19 judges that the remaining capacity has dropped to the second remaining capacity, it may land the car 5 on a floor one floor above the lowest floor, and then open the car door 41 and the hall door 42 of the floor where the car 5 has landed to halt the ascent and descent of the car 5.

[0051] Furthermore, after the lifting and lowering of the car 5 is stopped, the control panel 19 may cause the notification unit to execute a notification to the effect that the lifting and lowering of the car 5 is stopped. Such a notification may be executed, for example, by displaying a message on the in-car display unit 27 indicating that the lifting and lowering of the car 5 is stopped. Here, as the message indicating that the lifting and lowering of the car 5 is stopped, for example, a message such as "Elevator operation is temporarily suspended due to flooding of the pit. We apologize for the inconvenience." may be adopted.

[0052] Next, the structure of the water level detection sensor capable of detecting three different water levels will be described in detail. Figure 3 is a front view of the water level detection sensor 29, and Figure 4 is a schematic diagram for explaining the principle by which the water level detection sensor 29 detects the water level.

[0053] 3, the water level detection sensor 29 has an electrode holding portion 57, an earth electrode 59, a first water level detection electrode 53, a second water level detection electrode 54, a third water level detection electrode 55, and a separator 56. The earth electrode 59, the first water level detection electrode 53, the second water level detection electrode 54, and the third water level detection electrode 55 are each formed of an electrode rod, and each of the electrodes 53, 54, 55, and 59 extends vertically when the water level detection sensor 29 is appropriately installed in the pit 21.

[0054] The earth electrode 59, the first water level detection electrode 53, the second water level detection electrode 54, and the third water level detection electrode 55 are fixed to an electrode holding portion 57 made of an insulating material and spaced apart from one another in the horizontal direction. The first water level detection electrode 53 is longer than the second water level detection electrode 54 and has a portion that protrudes downward beyond the second water level detection electrode 54, and the second water level detection electrode 54 is longer than the third water level detection electrode 55 and has a portion that protrudes downward beyond the third water level detection electrode 55. The earth electrode 59 has approximately the same length as the first water level detection electrode 53, and the position of the lower end of the earth electrode 59 approximately coincides with the position of the lower end of the first water level detection electrode 53.

[0055] Separators 56 made of insulating plates are arranged at predetermined intervals in the vertical direction to prevent contact between the electrodes due to liquid flow, vibration, etc. The electrodes 53, 54, 55, 59 are fixed to the separators 56, thereby preventing the horizontal intervals between the electrodes 53, 54, 55, 59 from becoming shorter. The materials for the electrodes 53, 54, 55, 59 can be suitably selected from stainless steel, Hastelloy, titanium, etc.

[0056] Next, the principle of how the water level detection sensor 29 detects the water level will be described using the detection of the first water level using the first water level detection electrode 53 as an example. In the water level detection sensor 29, an AC voltage 58 is applied between the earth electrode 59 and the first water level detection electrode 53. When water is not in contact with both the earth electrode 59 and the first water level detection electrode 53, no current flows. On the other hand, when water comes in contact with both electrodes, a current flows through both electrodes 53, 59. The direction indicated by the arrow A in FIG. 4 is the direction of current flow. The water level detection sensor 29 determines whether or not the water has reached the first water level by determining whether or not the current is flowing.

[0057] The method of determining whether water has reached the second water level in the water level detection sensor 29 and the method of determining whether water has reached the third water level in the water level detection sensor 29 are the same as the method of determining whether water has reached the first water level. Whether water has reached the second water level is determined by whether a current has flowed through the second water level detection electrode 54. Moreover, whether water has reached the third water level is determined by whether a current has flowed through the third water level detection electrode 55.

[0058] Next, an example of a typical control of the control panel 19 in a state in which the emergency power supply 31 is not operating will be described. Fig. 5 is an example of a flowchart explaining the procedure of such control. With reference to Fig. 5, when heavy rain occurs and, for example, a person in a facility information center of a facility in which the elevator 10 is installed (or a wide-area information center that manages a plurality of elevators in a plurality of facilities) operates an information processing device to start a flood response operation program, control starts, and in step S1, the control panel 19 determines whether the water level has reached a first water level based on a signal from the water level detection sensor 29.

[0059] If a negative determination is made in step S1, step S1 is repeated. On the other hand, if a positive determination is made in step S1, the process proceeds to step S2, in which the control panel 19 drives the pump 30 to pump the water in the pit 21 out of the hoistway and discharge it out of the hoistway, and then, in step S3, the control panel 19 determines whether the water level has reached the second water level based on a signal from the water level detection sensor 29.

[0060] If a negative determination is made in step S3, the process proceeds to step S4, in which the control panel 19 determines whether or not the water level has fallen below the first water level based on a signal from the water level detection sensor 29. If a negative determination is made in step S4, step S3 is repeated. On the other hand, if a positive determination is made in step S4, the control panel 19 stops the movement of the pump 30 in step S5, and the control returns.

[0061] On the other hand, if the determination in step S3 is affirmative, the process proceeds to step S6, where the control panel 19 displays on the in-car display unit 27 a message that a person can recognize as meaning that the car 5 may automatically stop. In step S7 after step S6, the control panel 19 outputs, by automatic voice, to the in-car voice output device 25 and the landing voice output device 28 on each floor a message that a person can recognize as meaning that the car 5 may automatically stop, and at the same time, the timer 49 starts timing. As described above, examples of the message displayed by the in-car display unit 27 in step S6 and the message output by the in-car voice output device 25 and the landing voice output device 28 on each floor in step S7 include, for example, "The pit is flooded. If the degree of flooding exceeds the allowable range, elevator operation will be temporarily suspended to ensure safety."

[0062] In step S8 after step S7, the control panel 19 judges whether or not the water level has fallen below the second water level based on the signal from the water level detection sensor 29. If the judgment in step S8 is affirmative, the process proceeds to step S9, in which the control panel 19 ends the display of the message on the car interior display unit 27 and also ends the time measurement by the timer 49. Thereafter, steps S3 and onward are repeated. On the other hand, if the judgment in step S8 is negative, the process proceeds to step S10, in which the control panel 19 judges whether or not the water level has reached the third water level based on the signal from the water level detection sensor 29.

[0063] If a negative determination is made in step S10, the process proceeds to step S11, where the control panel 19 determines whether or not a predetermined time has elapsed since the timer 49 started timing. If a negative determination is made in step S11, steps S8 and onward are repeated. On the other hand, if a positive determination is made in step S8, the process proceeds to step S12, where the timer 49 stops timing, and then steps S7 and onward are repeated.

[0064] On the other hand, if the determination in step S10 is affirmative, the process proceeds to step S13, where the control panel 19 lands the car 5 at a floor at least one floor higher than the lowest floor, and then opens the car door 41 and the landing door 42 at the landing floor of the car 5. In addition, in step S14 following step S13, the control panel 19 displays on the in-car display unit 27 a message indicating that the lifting and lowering of the car 5 is suspended. As described above, a possible message indicating that the lifting and lowering of the car 5 is suspended is, for example, "Elevator operation has been temporarily suspended due to flooding of the pit. We apologize for any inconvenience."

[0065] In step S15 after step S14, the control panel 19 determines whether the water level has fallen below the third water level based on a signal from the water level detection sensor 29. If a negative determination is made in step S15, step S15 is repeated. On the other hand, if a positive determination is made in step S15, the process proceeds to step S16, in which the control panel 19 stops displaying the message on the car display unit 27, and then in step S17, normal operation of the elevator 10 is started, after which steps S6 and onward are repeated. This control ends when a person in the facility information center of the facility (or a wide-area information center that manages multiple elevators in multiple facilities) who has determined that there is no longer any risk of the water in the pit 21 reaching the first water level ends the startup of the flood response operation program using an information processing device.

[0066] Next, an example of a typical control of the control panel 19 when the emergency power supply 31 is driven and supplies power to each device of the elevator 10 when the pit 21 is flooded will be described. Fig. 6 is an example of a flowchart explaining the procedure of such control. With reference to Fig. 6, when the emergency power supply 31 is driven and starts supplying power to each device of the elevator 10 while the flood response operation program is running, the control starts, and in step S11, the control panel 19 determines whether the water level has reached the first water level based on a signal from the water level detection sensor 29.

[0067] If the determination in step S11 is negative, step S11 is repeated. On the other hand, if the determination in step S11 is positive, the process proceeds to step S12, where the control panel 19 drives the pump 30 to pump the water in the pit 21 out of the hoistway and discharge it out of the hoistway, and then, in step S13, the control panel 19 determines whether the remaining capacity of the emergency power supply 31 has decreased to a second remaining capacity that is equal to or greater than the first remaining capacity required to move the car 5 from the lowest floor to the floor one floor above, based on a signal from the capacity detection device 32.

[0068] Here, the second remaining capacity is set to a capacity equal to or greater than the capacity required to open the car door 41 after the car 5 has been moved from the lowest floor to the floor one floor above (this capacity includes the power capacity required for signal exchange and the power capacity for turning on the car interior lighting, etc.). Note that the second remaining capacity is preferably set to a capacity that is a predetermined capacity greater than the capacity required to open the car door 41 after the car 5 has been moved from the lowest floor to the floor one floor above (this capacity includes the power capacity required for signal exchange and the power capacity for turning on the car interior lighting, etc.).

[0069] If the determination in step S13 is affirmative, the process proceeds to step S14, where the control panel 19 stops driving the pump 30. Then, in the following step S15, the control panel 19 lands the car 5 on a floor that is at least one floor higher than the lowest floor, and then opens the car door 41 and the landing door 42 of the landing floor of the car 5, and the control ends.

[0070] On the other hand, if a negative determination is made in step S13, the process proceeds to step S16, in which the control panel 19 determines, based on a signal from the water level detection sensor 29, whether or not the water level has reached the second water level.

[0071] If a negative determination is made in step S16, the process proceeds to step S17, where the control panel 19 determines whether or not the water level has fallen below the first water level based on a signal from the water level detection sensor 29. If a negative determination is made in step S17, step S13 is repeated. On the other hand, if a positive determination is made in step S17, the control panel 19 stops the movement of the pump 30 in step S18, and then steps S11 and onward are repeated.

[0072] On the other hand, if the determination in step S16 is affirmative, the process proceeds to step S19, where the control panel 19 displays on the in-car display unit 27 a message that a person can recognize as meaning that there is a possibility that the car 5 will automatically stop. In step S20 after step S19, the control panel 19 causes the in-car voice output device 25 and the landing voice output device 28 on each floor to automatically output a message that a person can recognize as meaning that there is a possibility that the car 5 will automatically stop, and at the same time, the timer 49 starts timing.

[0073] In step S21 after step S20, the control panel 19 determines whether or not the water level has fallen below the second water level based on a signal from the water level detection sensor 29. If a positive determination is made in step S21, the process proceeds to step S22, where the control panel 19 ends the display of text on the car interior display unit 27 and also ends the timing by the timer 49. Thereafter, steps S13 and onward are repeated. On the other hand, if a negative determination is made in step S21, the process proceeds to step S23, where the control panel 19 determines whether or not the water level has reached the third water level based on a signal from the water level detection sensor 29.

[0074] If a negative determination is made in step S23, the process proceeds to step S24, where the control panel 19 determines whether or not a predetermined time has elapsed since the timer 49 started timing. If a negative determination is made in step S24, steps S21 and onward are repeated. On the other hand, if a positive determination is made in step S24, the process proceeds to step S25, where the timer 49 stops timing, and then steps S20 and onward are repeated.

[0075] On the other hand, if the determination in step S23 is affirmative, the process proceeds to step S26, where the control panel 19 lands the car 5 on a floor one floor or more above the lowest floor, and then opens the car door 41 and the landing door 42 at the landing floor of the car 5. In step S27 following step S26, the control panel 19 displays on the car interior display unit 27 a message indicating that the ascent and descent of the car 5 is suspended. In step S28 following step S27, the control panel 19 determines whether the water level is below the third water level based on a signal from the water level detection sensor 29. If the determination in step S28 is negative, step S28 is repeated. On the other hand, if the determination in step S28 is affirmative, the process proceeds to step S29, where the control panel 19 ends the display of the message on the car interior display unit 27, and then in step S30, normal operation of the elevator 10 is started, and then steps S13 and onward are repeated.

[0076] This control ends not only when step S15 is completed, but also when someone in the facility's facility information center (or a wide-area information center that manages multiple elevators in multiple facilities) who has determined that there is no longer any risk of the water in the pit 21 reaching the first water level terminates the startup of the flood response operation program using an information processing device.

[0077] As described above, elevator 10 includes car 5 that moves up and down in hoistway 20, water level detection sensor 29 that is provided in pit 21 of hoistway 20 and can detect three or more different water levels, and pump 30 that discharges water accumulated in pit 21 to the outside of hoistway 20. Elevator 10 also includes an alarm unit (in-car audio output device 25, in-car display unit 27, and hall audio output device 28) that is provided in at least one of car 5 and hall 88 and issues an alarm that can be recognized by a person that car 5 may automatically stop. The elevator 10 also has a control device (control panel 19) that, when it receives a first signal from the water level detection sensor 29 indicating that the water has reached a first water level, controls the pump 30 to be driven to discharge the water from the pit 21 to outside the elevator shaft 20, and when it receives a second signal from the water level detection sensor 29 indicating that the water has reached a second water level higher than the first water level, controls the alarm unit to execute the above-mentioned alarm, and further, when it receives a third signal from the water level detection sensor 29 indicating that the water has reached a third water level higher than the second water level, controls the elevator 10 to stop the ascent and descent of the car 5 when the car 5 is located at a height of at least one floor higher than the lowest floor.

[0078] According to the present disclosure, when the control panel 19 receives a first signal from the water level detection sensor 29 indicating that the water has reached a first water level, the pump 30 is driven to discharge the water from the pit 21 to the outside of the elevator shaft 20. Therefore, when the amount of water accumulated in the pit 21 is small, the water can be automatically pumped from the pit 21 to the outside of the elevator shaft 20 without stopping the operation of the elevator 10. Also, even if the amount of water that has flooded the pit 21 is large and the elevator 10 has to be temporarily stopped, the elevator 10 can be quickly restored to operation.

[0079] Furthermore, when the control panel 19 receives a third signal from the water level detection sensor 29 indicating that the water has reached a third water level that is higher than the second water level that is higher than the first water level, the control panel 19 stops raising and lowering the car 5 when the car 5 is located at a height of at least one floor higher than the lowest floor. This prevents the car 5 from continuing to raise and lower when a large amount of water has accumulated in the pit 21, and prevents the car 5 from coming into contact with the water accumulated in the pit 21. This prevents water from entering the car 5 and prevents the car 5 from being damaged by water getting on the electrical components of the car 5, such as the connection terminals of the car 5 that connect cables, etc., and as a result, the safety of people using the car 5 can be ensured.

[0080] Furthermore, when the control panel 19 receives from the water level detection sensor 29 a second signal indicating that the water has reached a second water level, which is higher than the first water level and less than the third water level, it causes the notification unit to execute a notification that allows a person to recognize the possibility that the car 5 may automatically stop. Therefore, since the elevator 10 does not suddenly stop without notice and a notice of the stoppage of the elevator 10 is given in advance, it is possible to prevent a situation in which a person feels psychological pressure due to the car 5 suddenly stopping without notice.

[0081] In addition, when the control panel 19 receives the third signal, it may stop the car 5 at a floor that is at least one floor higher than the lowest floor and is also the nearest floor to the car 5, and then open the car door 41 and the landing door 42 at the stopping floor of the car 5. Alternatively, when the control panel 19 receives the third signal, it may always stop the car 5 at a floor that is one floor higher than the lowest floor, and then open the car door 41 and the landing door 42 at the stopping floor of the car 5 (in this case, the floor that is one floor higher than the lowest floor).

[0082] In addition, the notification unit may include at least one of a voice output device (in-cage voice output device 25 and hall voice output device 28) that automatically outputs wording that a person can recognize as indicating that the cage 5 may stop automatically, and a display device (in-cage display unit 27) that displays the above wording.

[0083] According to this configuration, it is possible to reliably inform people using the elevator 10 that the car 5 may automatically stop.

[0084] The notification unit may include a voice output device (car voice output device 25 and hall voice output device 28), and while the water level remains equal to or higher than the second water level and lower than the third water level, the voice output device may output the above-mentioned message by automatic voice at predetermined time intervals. Note that the predetermined time may also include 0 hours.

[0085] According to this configuration, while the water level remains equal to or higher than the second water level and lower than the third water level, a message that a person can recognize as meaning that the car 5 may stop automatically is repeated. Therefore, the person using the elevator 10 can be reliably informed by voice that the car 5 may stop automatically.

[0086] In addition, the water level detection sensor 29 and the pump 30 are configured to receive power from an external power supply source, and may be provided with an emergency power supply 31 that supplies power to the water level detection sensor 29 when the water level detection sensor 29 is no longer able to receive power from the power supply source.

[0087] According to this configuration, even if the power supply from the external power source to the water level detection sensor 29 is cut off, the emergency power supply 31 supplies power to the water level detection sensor 29. Therefore, the water level of the water accumulated in the pit 21 can be reliably detected.

[0088] In addition, an emergency power supply 31 may be configured to supply power to the pump 30 when the pump 30 is unable to receive power from the power supply source.

[0089] According to this configuration, even if the power supply from the power source to the pump 30 is cut off during flooding, the water accumulated in the pit 21 can be discharged outside the elevator shaft 20 using the power from the emergency power source 31.

[0090] In addition, a capacity detection device 32 may be provided to detect the remaining capacity of the emergency power supply 31, and when the control panel 19 determines based on a signal from the capacity detection device 32 that the remaining capacity has dropped to a second remaining capacity that is equal to or greater than the first remaining capacity required to move the car 5 from the lowest floor to the floor one floor above, control may be performed to prohibit the emergency power supply 31 from supplying power to the pump 30.

[0091] When the power supply from the power supply source to the hoist motor 13a is cut off, the power of the emergency power source may be supplied to the hoist motor 13a. In such a case, by adopting this configuration, it is possible to prevent a situation in which the car 5 cannot be parked on a floor one floor higher than the lowest floor.

[0092] In addition, when the control panel 19 determines that the remaining capacity has dropped to the second remaining capacity, it may land the car 5 on a floor that is one floor higher than the lowest floor, and then open the car door 41 and the landing door 42 at the floor where the car 5 has landed, thereby halting the ascent and descent of the car 5.

[0093] According to this configuration, it is possible to prevent the cage 5 from being unable to be parked on a floor one floor or more above the lowest floor, to prevent the cage 5 from being flooded, and further to prevent people from being trapped inside the cage when it is flooded.

[0094] In addition, after the lifting and lowering of the car 5 has stopped, the control panel 19 may cause the notification unit to issue a notification to the effect that the lifting and lowering of the car 5 has stopped.

[0095] According to this configuration, passengers can recognize that the lifting and lowering of the car 5 has stopped, and can quickly take appropriate action based on that recognition.

[0096] Furthermore, the emergency power supply 31 may supply power for raising and lowering the car 5 when a power outage occurs.

[0097] Typically, the elevator 10 is equipped with an emergency power supply to supply power to the hoist motor 13a and the car door opening / closing motor 26 to land the car 5 at the nearest floor and open the car doors 41 and hall doors 42 in the event of a power outage.

[0098] According to this configuration, an emergency power supply that has been provided for supplying power in the event of a power outage can be used as a power supply device (emergency power supply 31) that supplies power to the pump and water level detection sensor in an emergency. Therefore, sensing by the water level detection sensor 29 and the water pumping operation by the pump 30 in an emergency can be realized without much investment in new equipment.

[0099] In addition, the control panel 19 controls the hoist motor 13a and the car door opening / closing motor 26 that opens and closes the car door 41 based on a signal from a car call button 38 installed at the landing 88 and a signal from a destination floor designation button 39 installed inside the car, and the emergency power supply 31 may be set above the control panel 19.

[0100] In the elevator 10, the control panel 19 that controls the hoist motor 13a and the car door opening / closing motor 26 that opens and closes the car doors 41 is the heart of the elevator 10 and is responsible for the controls necessary for the operation of the elevator 10, so it is generally installed in a location that will not be submerged in water. With this configuration, the emergency power supply 31 can be installed simply and inexpensively in a location that is unlikely to be submerged in water.

[0101] The present disclosure is not limited to the above-described embodiment and its modified examples, and various improvements and modifications are possible within the scope of the claims of the present application and their equivalents.

[0102] For example, in the above embodiment, the control device is the control panel 19 that controls the hoist motor 13a and the car door opening / closing motor 26. However, the control device may be provided outside the control panel, not the control panel that controls the hoist motor and the car door opening / closing motor.

[0103] Also, the water level detection sensor has been described as having a structure for detecting three different water levels using electrode rods. However, the water level detection sensor may have any structure as long as it has a structure for detecting three different water levels, and may have a structure, for example, a float to which a magnetic force detection sensor is fixed and a case to which three magnets installed at different heights are fixed, and when the float floats up to the same height as each magnet, the magnetic force of the magnet located at that height is detected to detect the height (water level).

[0104] Also, although the case where the notification unit includes the in-car audio output device 25, the in-car display unit 27, and the hall audio output device 28 has been described, the notification unit does not have to include one or more of them. Note that when the notification unit does not include all of them, for example, the notification unit may be configured with a warning light, and when the warning light is turned on, a note may be displayed inside the car to the effect that the car may stop ascending or descending.

[0105] In addition, the emergency power supply does not have to be set above the control device. In addition, there may be no emergency power supply that supplies power to the water level detection sensor when the water level detection sensor is unable to receive power from the power supply source, and there may be no emergency power supply that supplies power to the pump when the water level detection sensor is unable to receive power from the power supply source. In addition, there may be no capacity detection device that detects the remaining capacity of the emergency power supply. In addition, after the raising and lowering of the car has stopped, the control device may not cause the notification unit to issue a notification indicating that the raising and lowering of the car has stopped. [Explanation of symbols]

[0106] 5 cage, 10 elevator, 11 wire rope, 12 counterweight, 13 hoist, 13a hoist motor, 14 first pulley, 15 second pulley, 16 third pulley, 17 fourth pulley, 18 fifth pulley, 19 control panel, 20 elevator, 21 pit, 25 cage voice output device, 26 cage door opening / closing motor, 27 cage display unit, 28 hall voice output device, 29 water level detection sensor, 30 pump, 31 emergency power source, 32 capacity detection device, 38 cage call button, 39 destination floor designation button, 41 cage door, 42 hall door, 48 timer, 49 timer, 51 control unit, 51a hoist motor control unit, 51b Car door motor control unit, 51c pump drive control unit, 51d car display control unit, 51e car sound control unit, 51f landing sound control unit, 52 memory unit, 53 first water level detection electrode, 54 second water level detection electrode, 55 third water level detection electrode, 56 separator, 57 electrode holding unit, 58 AC voltage, 59 earth electrode, 77 power supply source, 88 landing.

Claims

1. A car that ascends and descends within the elevator shaft; a water level detection sensor provided in a pit of the elevator shaft and capable of detecting three or more different water levels; A pump for discharging water accumulated in the pit to the outside of the elevator shaft; A notification unit that is installed in at least one of the car and the landing and that issues a notification that can be recognized by a person that the car may automatically stop; a control device which, when receiving a first signal from the water level detection sensor indicating that water has reached a first water level, controls the pump to be driven to discharge water from the pit to outside the elevator shaft, and, when receiving a second signal from the water level detection sensor indicating that water has reached a second water level higher than the first water level, controls the notification unit to execute the notification, and further, when receiving a third signal from the water level detection sensor indicating that water has reached a third water level higher than the second water level, controls to pause the lifting and lowering of the car when the car is located at a height that is at least one floor higher than the lowest floor, The notification is not performed before the control device receives the second signal, The water level detection sensor and the pump are supplied with power from an external power supply source, an emergency power supply for supplying power to the water level detection sensor when the water level detection sensor is unable to receive power from the power supply source; The control device is installed above the water level detection sensor at a location that will not be submerged in water, and controls a motor for a hoist and a motor for opening and closing a car door based on a signal from a car call button installed at a landing and a signal from a destination floor designation button installed in the car, The emergency power supply is installed above the control device.

2. A car that ascends and descends within the elevator shaft; a water level detection sensor provided in a pit of the elevator shaft and capable of detecting three or more different water levels; A pump for discharging water accumulated in the pit to the outside of the elevator shaft; A notification unit that is installed in at least one of the car and the landing and that issues a notification that can be recognized by a person that the car may automatically stop; a control device which, when receiving a first signal from the water level detection sensor indicating that water has reached a first water level, controls the pump to be driven to discharge water from the pit to outside the elevator shaft, and, when receiving a second signal from the water level detection sensor indicating that water has reached a second water level higher than the first water level, controls the notification unit to execute the notification, and further, when receiving a third signal from the water level detection sensor indicating that water has reached a third water level higher than the second water level, controls to pause the lifting and lowering of the car when the car is located at a height that is at least one floor higher than the lowest floor, The water level detection sensor and the pump are supplied with power from an external power supply source, an emergency power supply for supplying power to the water level detection sensor when the water level detection sensor is unable to receive power from the power supply source; the emergency power source supplies power to the pump when the pump is unable to receive power from the power supply source; a capacity detection device for detecting a remaining capacity of the emergency power supply, When the control device determines, based on a signal from the capacity detection device, that the remaining capacity has decreased to a second remaining capacity that is equal to or greater than a first remaining capacity required to move the car from the lowest floor to a floor one floor higher, the control device performs control to prohibit the emergency power source from supplying power to the pump, The elevator, wherein the second remaining capacity is a capacity that is larger by a predetermined capacity than a capacity required to open a car door after moving the car from the lowest floor to the floor one floor above.

3. 3. The elevator according to claim 2, wherein when the control device determines that the remaining capacity has decreased to the second remaining capacity, the control device lands the car on a floor that is one floor higher than the lowest floor, and then opens a car door and a hall door at the floor where the car has landed, thereby halting the lifting and lowering of the car.

4. 4. The elevator according to claim 1, wherein the emergency power supply supplies power for raising and lowering the car when a power outage occurs.

Images