Elevator abnormality detection device

Abstract

To improve the accuracy of detecting damage to a water-cooled cooling device used in an elevator system. [Solution] An elevator abnormality detection device according to an embodiment has a memory unit that stores at least one of the following values ​​as a reference value: the value of the pump's driving current under normal conditions, the value of the water pressure in the pipes under normal conditions, the value of the flow rate of water flowing in the pipes under normal conditions, the value of the vibrations emitted by the water-cooled cooling device under normal conditions, and the value of the sound emitted by the water-cooled cooling device under normal conditions; and an abnormality detection unit that compares the measured value of at least one of the following values ​​measured each time the car goes up and down: the value of the driving current under normal conditions, the value of the water pressure in the pipes, the value of the flow rate of water flowing in the pipes, the value of the vibrations emitted by the water-cooled cooling device, and the sound emitted by the water-cooled cooling device, with the reference value, and detects that an abnormality has occurred in the water-cooled cooling device if the difference between the measured value and the reference value exceeds a predetermined value.

Description

[Technical Field]

[0001] An embodiment of the present invention relates to an elevator abnormality detection device. [Background technology]

[0002] An elevator system is equipped with an inverter power supply to drive an elevator motor that raises and lowers the car and an opening / closing motor that opens and closes the car doors. If the inverter power supply becomes too hot, the semiconductors that make up the inverter power supply will be damaged, so the inverter power supply is often cooled by forced air cooling.

[0003] As elevator equipment becomes larger, the required output power of the inverter power supply also increases, and accordingly the amount of heat generated by the inverter power supply also increases. When forced air cooling is not effective enough, a water-cooled cooling device may be used to cool the inverter power supply.

[0004] A water-cooled cooling system cools the inverter power supply by running water through a pipe inside a heat sink used to cool the semiconductors in the inverter power supply. The water in the pipe is moved by a pump and cooled by a radiator.

[0005] In the case of forced air cooling, the only cooling device is a fan motor for blowing air. When the fan motor for blowing air stops, the temperature of the switching element (semiconductor) of the inverter power supply rises rapidly. Therefore, by installing a temperature sensor near the switching element of the inverter power supply, it is possible to determine whether the cooling device has been damaged. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2019-151437

[0007] On the other hand, a water-cooled cooling system is composed of multiple components, such as multiple pipes, tanks, pumps, and radiators. The causes of damage to a water-cooled cooling system are complex, such as cracks in the pipes, the radiator fan stopping, or a decrease in the driving force of the pump, and the degree of decrease in cooling effectiveness varies. Therefore, it is difficult to determine whether a water-cooled cooling system has been damaged. Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the accuracy of detecting damage to a water-cooled cooling device used in an elevator system. [Means for solving the problem]

[0009] An elevator abnormality detection device according to an embodiment for solving the above problem is an elevator abnormality detection device that detects an abnormality in a water-cooled cooling device that cools a power supply that supplies power to a motor that drives the elevator car. The elevator abnormality detection device according to the embodiment includes a memory unit that stores at least one of a pump drive current value under normal conditions, a water pressure value in the piping under normal conditions, a water flow rate value in the piping under normal conditions, a vibration value generated by the water-cooled cooling device under normal conditions, and a sound value generated by the water-cooled cooling device under normal conditions as a reference value, and an abnormality detection unit that compares a measured value of at least one of the drive current value, the water pressure value in the piping, the water flow rate value in the piping, the vibration value generated by the water-cooled cooling device, and the sound generated by the water-cooled cooling device measured each time the elevator car moves up and down with a reference value, and detects that an abnormality has occurred in the water-cooled cooling device if the difference between the measured value and the reference value exceeds a predetermined value. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view of an elevator apparatus according to an embodiment of the present invention. [Figure 2] FIG. 2 is a block diagram showing a control system of the elevator apparatus according to the present embodiment. [Figure 3]FIG. 2 is a block diagram of a drive unit according to the present embodiment. [Figure 4] FIG. 2 is an image diagram of a heat sink used in the inverter according to the present embodiment. [Figure 5] 1 is a block diagram of a water-cooling type cooling device according to an embodiment of the present invention. [Figure 6] FIG. 2 is a block diagram of a control unit according to the present embodiment. [Figure 7] 4 is a flowchart for explaining an abnormality detection process performed by the elevator abnormality detection device according to the present embodiment. [Figure 8] 10A and 10B are diagrams for explaining estimation of the cause of damage by the abnormality detection unit according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] This embodiment will be described below with reference to the drawings. In the description, an XYZ coordinate system consisting of mutually orthogonal X, Y, and Z axes will be used where appropriate. The drawings and flowcharts used to describe this embodiment are merely examples.

[0012] (Embodiment 1) Fig. 1 is a perspective view of an elevator system 10 according to this embodiment. The elevator system 10 is disposed inside a hoistway 11 provided in a building such as a commercial facility or residential facility. As shown in Fig. 1, the elevator system 10 includes a car 31, a counterweight 35, an elevator motor 40, a control panel 70 (elevator control device), and the like.

[0013] The car 31 is a unit that accommodates passengers and moves them up and down the elevator shaft 11. The car 31 is disposed between the guide rails and is attached so as to be movable up and down relative to the guide rails 21 to 24.

[0014] An opening 31a for entering and exiting the interior is formed on the side surface on the +X side of the car 31. The opening 31a is closed or opened by a pair of doors 32 that move along the side surface of the car 31. The doors 32 are opened and closed by an opening / closing motor (not shown in FIG. 1).

[0015] The counterweight 35 is attached so as to be movable up and down relative to the guide rails 21 to 24. The weight of the counterweight 35 is adjusted to be a predetermined ratio to the weight of the car 31.

[0016] The lift motor 40 is a motor for raising and lowering the car 31. The lift motor 40 is disposed at the top of the elevator shaft 11 so that its rotation axis is parallel to the Y axis. A pulley 42 is fixed to the rotation axis of the lift motor 40. A wire 43 is wound around the pulley 42 of the lift motor 40. One end of the wire 43 is fixed to the car 31, and the other end is fixed to the counterweight 35.

[0017] The control panel 70 is disposed in the hoistway 11. The control panel 70 houses a control device for controlling the hoisting motor 40 and the equipment provided in the car 31. Note that the following embodiment will be described taking as an example a machine room-less elevator in which the control panel 70 is disposed in the hoistway 11, but this embodiment can also be applied to a case in which there is a machine room.

[0018] Although not shown in FIG. 1, a temperature sensor 38 for measuring the temperature inside the hoistway 11 is provided near the control panel 70.

[0019] 2 is a block diagram showing a control system of the elevator apparatus 10. The control system includes a control unit 80 and a drive unit 90 housed in a control panel 70, an operation panel 36, a load sensor 37, and a temperature sensor 38 provided in the car 31.

[0020] The operation panel 36 is provided on the inner wall surface of the car 31. The operation panel 36 is an interface for receiving destination floors and the like from users of the car 31. By operating the operation panel 36, users can register destination floors and the like for the car 31 and open and close the doors 32.

[0021] The load sensor 37 is a sensor that measures the load carried on the car 31. The temperature sensor 38 is a sensor that measures the temperature (environmental temperature) inside the elevator shaft 11 (for example, near the control panel 70).

[0022] The drive unit 90 shown in Fig. 2 drives the lift motor 40, which drives the elevator car 31 to move up and down, and the opening / closing motor 41 (not shown in Fig. 1), which drives the door 32 of the elevator car 31 to open and close, by supplying power to the lift motor 40 and the opening / closing motor 41. The drive unit 90 drives the lift motor 40 based on instructions from the control unit 80. The drive unit 90 also drives the opening / closing motor 41 based on instructions from the control unit 80.

[0023] FIG. 3 is a block diagram of a drive unit 90. The drive unit 90 has a converter 91 and an inverter 93. A smoothing capacitor 92 is provided between the converter 91 and the inverter 93. The converter 91 converts AC power from the commercial power source 1 into power suitable for the inverter 93. The inverter 93 is a power supply device that supplies power to the lift motor 40 and the open-close motor 41. Note that the open-close motor 41 is not shown in FIG. 3. The inverter 93 is configured with a switching regulator. When the lift motor 40 and the open-close motor 41 are formed as three-phase AC motors, the inverter 93 outputs a three-phase AC voltage.

[0024] A power sensor 96 that measures the current supplied to the lift motor 40 is provided at the output of the inverter 93. In addition, a temperature sensor 97 that measures the temperature of the heat generating element is provided near the heat generating element that constitutes the inverter 93 (for example, near the switching element, near the heat sink, etc.).

[0025] Returning to FIG. 2, the control unit 80 is a computer having a CPU, a main memory, an auxiliary memory, and an interface. The CPU executes the processes described below in accordance with the programs stored in the auxiliary memory. The main memory has RAM and the like. The main memory is used as a working area for the CPU. The auxiliary memory has non-volatile memory such as ROM and semiconductor memory. The auxiliary memory stores the programs executed by the CPU. The auxiliary memory also stores data indicating the state of the water-cooled cooling device under normal conditions as reference values ​​(value of the pump driving current, value of the water pressure in the pipes, value of the flow rate of water flowing in the pipes, value of vibration, value of sound).

[0026] The interface unit has a serial interface, a parallel interface, a wireless LAN interface, etc. The operation panel 36 and the drive unit 90 are connected to the CPU via the interface unit. In addition, an input / output device 100 consisting of a keyboard, a display, etc. is connected to the interface unit.

[0027] FIG. 4 is a conceptual diagram of a heat sink 300 used in the inverter 93. The heat generating elements 921 are switching elements or the like that constitute the inverter 93. Here, eight heat generating elements 921 are arranged as shown in FIG. 4. A heat sink 300 is provided to cool the multiple heat generating elements 921. The heat sink 300 has a heat transfer plate 310 arranged in contact with the multiple heat generating elements 921, and multiple heat dissipation fins 320 arranged on the surface (-Z side surface) of the heat transfer plate 310 opposite to the surface (+Z side surface) that contacts the heat generating elements 921. The heat transfer plate 310 is provided with multiple pipes 210. The inverter 93 may have multiple substrates as shown in FIG. 4. In this case, a heat sink 300 may be provided for each substrate. Alternatively, multiple heat sinks 300 may be provided within a single substrate. A temperature sensor 97 may be provided for each heat generating element 921, each heat sink 300, or each substrate.

[0028] 4, multiple forced air-cooling fans 350 are provided on the +Y side of heat sink 300. For example, forced air cooling blows cool air in the Y-axis direction. In the example shown in FIG. 4, two cooling devices are used: an air-cooling type cooling device using fans 350 and a water-cooling type cooling device using piping 210.

[0029] FIG. 5 is a block diagram of the water-cooled cooling device 200. The water-cooled cooling device 200 includes a pipe 210, a pump 220, a radiator 230, and a tank 240. The pipe 210 contains water as a refrigerant therein and cools a heat sink 300 provided in the inverter 93. For example, as shown in FIG. 4, the pipe 210 is arranged to pass through a heat transfer plate 310 of the heat sink 300. The pump 220 causes the water flowing through the pipe 210 to circulate. The radiator 230 cools the water flowing through the pipe 210. The radiator 230 includes one or more cooling fans. The tank 240 is a container for storing water. By including the tank 240 that stores water, it is possible to suppress an increase in the temperature of the water in the pipe 210. The tank 240 is arranged, for example, between the radiator 230 and the pump 220.

[0030] The pump 220 adjusts the flow rate of water flowing through the piping 210 based on the control of a pump motor control unit 222. The pump motor control unit 222 is controlled by a drive unit control unit 71, which will be described later. The drive unit control unit 71 controls the inverter 93 to output the power required to drive the car 31 based on the load or travel distance of the car 31. The heat generation amount of the heating element 921 of the inverter 93 correlates with the output power of the inverter 93. The drive unit control unit 71 controls the pump motor control unit 222 based on control information for controlling the inverter 93, thereby controlling the flow rate of water caused to flow by the pump 220 so that the temperature of the heating element 921 of the inverter 93 is equal to or lower than a predetermined temperature. In other words, the flow rate of water caused to flow through the piping 210 by the pump 220 changes in accordance with the heat generation amount of the inverter 93.

[0031] The pump 220 is provided with a current sensor 250 that measures the current that drives the pump 220 (the current supplied to the pump 220). The flow rate of water that the pump 220 makes flow and the current that drives the pump 220 are correlated.

[0032] Further, a vibration sensor 251 and a noise sensor 252 are provided near the pump 220. The vibration sensor 251 measures the vibrations generated by the pump 220. The noise sensor 252 measures the sounds generated by the pump 220.

[0033] The pipe 210 is also provided with a water pressure sensor 253 that measures the water pressure in the pipe 210 and a water flow sensor 254 that measures the flow rate of water flowing through the pipe 210. The water pressure sensor 253 and the water flow sensor 254 may be disposed at any position. While Fig. 5 shows the case where they are disposed between the heat sink 300 and the radiator 230, they may also be disposed between the pump 220 and the heat sink 300, for example.

[0034] 6 is a functional block diagram of the control unit 80. The CPU of the control unit 80 implements a drive unit control section 71 and an abnormality detection device 72 by executing a program stored in the auxiliary storage section.

[0035] The drive unit control unit 71 controls the drive unit 90 based on input from the operation panel 36 or the call panel on each floor. For example, when the drive unit control unit 71 rotates the lift motor 40 in the forward direction via the drive unit 90, the car 31 rises and the counterweight 35 descends. When the drive unit control unit 71 rotates the lift motor 40 in the reverse direction via the drive unit 90, the car 31 descends and the counterweight 35 rises. When the drive unit control unit 71 rotates the opening / closing motor 41 in the forward direction via the drive unit 90, the doors 32 of the car 31 and the doors provided at the landings on each floor are controlled to open, and when the opening / closing motor 41 is rotated in the reverse direction, the doors 32 of the car 31 and the doors provided at the landings on each floor are controlled to close.

[0036] Furthermore, the drive unit control section 71 controls the pump motor control section 222 to control the flow rate of water caused by the pump 220 so that the temperature of the heating element 921 of the inverter 93 is kept at or below a predetermined temperature.

[0037] The abnormality detection device 72 is a device that detects an abnormality in the water-cooling type cooling device 200. The abnormality detection device 72 includes an operating status monitoring unit 721, a storage unit 722, and an abnormality detection unit 723.

[0038] The operation status monitoring unit 721 monitors operation status, such as the load, travel distance, and car operation frequency. The heavier the load and the longer the travel distance, the greater the output power of the inverter 93. Furthermore, the higher the car operation frequency, the inverter 93 operates before the temperature of the switching elements constituting the inverter 93 drops, resulting in a higher temperature of the switching elements. The operation status monitoring unit 721 can acquire information on the load from the load sensor 37 and can acquire information such as the travel distance and car operation frequency from the drive unit control unit 71. Here, we will explain the case where the power per unit time supplied by the inverter 93 to the elevator motor 40 that drives the elevator 31 to move up and down is used as an indicator of the operating status of the car 31. The power measured by the power sensor 96 changes depending on the operation status, such as the load, travel distance, and operation frequency of the car 31, and can therefore be used as an indicator of the operating status. For example, the operation status monitoring unit 721 monitors the hourly power measured by the power sensor 96.

[0039] The storage unit 722 stores the value of the drive current of the pump 220 in normal operation as a reference value. The storage unit 722 also stores the water pressure value in the pipe 210 in normal operation as a reference value. The storage unit 722 also stores the flow rate of water flowing in the pipe 210 in normal operation as a reference value. The storage unit 722 also stores the value of the vibration emitted by the pump 220 in normal operation as a reference value. The storage unit 722 also stores the value of the sound emitted by the pump 220 in normal operation as a reference value. The vibration and sound values ​​include information on magnitude and frequency components.

[0040] The temperature of the heating element 921 of the inverter 93 also changes depending on the environmental temperature where the inverter 93 is located. For example, the temperature of the heating element of the inverter 93 will be different between summer and winter, or between daytime and nighttime, even under the same operating conditions. The memory unit 722 uses the hourly power measured by the power sensor 96 and the environmental temperature measured by the temperature sensor 38 as parameters, and stores the drive current value, water pressure value, water flow rate value, vibration value, and sound value of the pump 220 under normal conditions as reference values ​​for each combination of these parameters. These reference values ​​are created for each travel distance of the car 31 (for example, from the first floor to the fifth floor, from the fifth floor to the seventh floor, etc.).

[0041] The abnormality detection unit 723 compares the measurement value of the drive current of the pump 220 measured by the current sensor 250 with a reference value stored in the memory unit 722 each time the car 31 rises or falls, and detects that an abnormality has occurred in the water-cooled cooling device 200 if the difference between the measurement value and the reference value exceeds a predetermined value. The abnormality detection unit 723 also compares the measurement value of the water pressure measured by the water pressure sensor 253 with the reference value stored in the memory unit 722 each time the car 31 rises or falls, and detects that an abnormality has occurred in the water-cooled cooling device 200 if the difference between the measurement value and the reference value exceeds a predetermined value. The abnormality detection unit 723 also compares the measurement value of the water flow rate measured by the water flow sensor 254 with the reference value stored in the memory unit 722 each time the car 31 rises or falls, and detects that an abnormality has occurred in the water-cooled cooling device 200 if the difference between the measurement value and the reference value exceeds a predetermined value. The abnormality detection unit 723 also compares the measurement value of vibration measured by the vibration sensor 251 with a reference value stored in the memory unit 722 each time the car 31 rises or falls, and detects that an abnormality has occurred in the water-cooled cooling device 200 if the difference between the measurement value and the reference value exceeds a predetermined value. The abnormality detection unit 723 also compares the measurement value of sound measured by the noise sensor 252 with a reference value stored in the memory unit 722 each time the car 31 rises or falls, and detects that an abnormality has occurred in the water-cooled cooling device 200 if the difference between the measurement value and the reference value exceeds a predetermined value. The abnormality detection unit 723 also detects that an abnormality has occurred in the water-cooled cooling device 200 if the frequency components of the vibration measured by the vibration sensor 251 include a frequency component that is not detected under normal conditions. The abnormality detection unit 723 also detects that an abnormality has occurred in the water-cooled cooling device 200 if the frequency components of the sound measured by the noise sensor 252 include a frequency component that is not detected under normal conditions. As the reference value, data on the same operating conditions as the measured value is used.

[0042] When the abnormality detection unit 723 detects an abnormality, it outputs a message that an abnormality has occurred in the input / output device 100. The abnormality detection unit 723 also notifies the drive unit control unit 71 that an abnormality has occurred. When the drive unit control unit 71 receives the notification that an abnormality has occurred, it controls the drive unit 90 to operate the car 31 in a safety mode. The safety mode is an operation in which the lifting / lowering acceleration and lifting / lowering speed of the car 31 are reduced compared to normal operation.

[0043] Next, the abnormality detection process of the elevator apparatus 10 will be described with reference to the flowchart shown in Fig. 7. The following control is performed based on a program stored in the auxiliary storage unit, and is mainly performed by the control unit 80 (CPU).

[0044] Before operating the elevator device 10, reference values ​​are obtained (step S11). In detail, the value of the driving current of the pump 220 under normal conditions, the value of the water pressure under normal conditions, the value of the water flow rate under normal conditions, the value of the vibration generated by the pump 220 under normal conditions, and the value of the sound generated by the pump 220 under normal conditions are obtained as reference values ​​and stored in the storage unit 722. The reference values ​​are obtained under conditions in which the combination of parameters of the load on the car 31, the travel distance, the operation frequency of the car, and the environmental temperature measured by the temperature sensor 38 is changed. Here, the power per unit time supplied by the inverter 93 to the elevator motor 40 that drives the elevator 31 to move up and down is used as an index indicating the operating state of the car 31, including the load on the car 31, the travel distance, and the operation frequency of the car. By using the power per unit time supplied by the inverter 93 to the elevator motor 40 that drives the elevator 31 to move up and down as an index showing the operating state of the elevator 31, including the load on the elevator 31, the travel distance, and the operating frequency of the elevator 31, it is possible to reduce the number of pieces of data to be acquired as parameters. Furthermore, since the number of parameter combinations can be reduced, the CPU processing load can be reduced.

[0045] When the elevator apparatus 10 starts operating, the operation status monitoring unit 721 monitors the output power (for example, the output power per hour) of the inverter 93 to monitor the operation status (step S12).

[0046] The abnormality detection device 72 monitors whether or not the elevator car 31 is moving up or down (step S13). The abnormality detection device 72 performs this monitoring by acquiring information indicating whether or not the elevator car 31 is moving up or down from the drive unit control unit 71.

[0047] If the elevator car 31 is moving up or down (step S13: Yes), the abnormality detection unit 723 acquires data indicating the state of the water-cooled cooling device 200 (step S14). The data indicating the state of the water-cooled cooling device 200 is the value of the driving current of the pump 220 measured by the current sensor 250, the value of the vibration of the pump 220 acquired by the vibration sensor 251, the value of the sound of the pump 220 acquired by the noise sensor 252, the value of the water pressure in the pipe 210 acquired by the water pressure sensor 253, and the value of the flow rate of water flowing in the pipe 210 acquired by the water flow sensor 254.

[0048] Next, the operation status monitoring unit 721 acquires information on the load weight of the car 31 from the load sensor 37, acquires information on the travel distance of the car 31 from the drive unit control unit 71, and acquires information on the environmental temperature from the temperature sensor 38 (step S15). As an index showing the operation status, the amount of power per unit time (for example, per hour) supplied by the inverter 93 to the elevator motor 40 that drives the elevator car 31 to move up and down is used.

[0049] Next, the abnormality detection unit 723 extracts reference values ​​corresponding to the parameters of the loaded weight of the car 31, the travel distance of the car 31, the operating status, and the environmental temperature acquired by the operation status monitoring unit 721 in step S15 from the storage unit 722. Then, the abnormality detection unit 723 compares the data indicating the state of the water-cooled cooling device 200 acquired in step S14 with the reference values ​​to determine whether or not there is an abnormality in the water-cooled cooling device 200 (step S16).

[0050] The abnormality detection unit 723 compares the measured values ​​of the drive current, water pressure, water flow rate, vibration, and sound of the pump 220 measured each time the car goes up and down with their respective reference values, and if the difference between the measured value and the reference value exceeds a predetermined value (step S16: Yes), it determines that an abnormality has occurred in the water-cooled cooling device 200. The abnormality detection unit 723 also determines that an abnormality has occurred in the water-cooled cooling device 200 if it detects frequency components that are not included in the measured vibration and sound data under normal conditions.

[0051] Next, the abnormality detection unit 723 estimates the cause of damage to the water-cooled cooling device 200 based on the measurement results of the various sensors (step S17). The abnormality detection unit 723 compares the measured value of at least one of the values ​​of the drive current of the pump 220 measured each time the car 31 goes up and down, the water pressure in the pipe 210, the flow rate of the water flowing through the pipe 210, the vibration generated by the water-cooled cooling device 200, and the sound generated by the water-cooled cooling device 200 with a reference value, and detects that an abnormality has occurred in the water-cooled cooling device 200 if the difference between the measured value and the reference value exceeds a predetermined value.

[0052] FIG. 8 is a table showing the relationship between the sensor that measured the abnormal value and the cause of damage to the water-cooled cooling device 200. For example, if the measurement value of the current sensor 250 or the water flow sensor 254 is an abnormal value, damage to the pump motor, the pipe 210, or the tank 240 is possible. Also, if the measurement value of the vibration sensor 251 or the noise sensor 252 is an abnormal value, damage to the pump motor is possible. Damage to the bearing is common in pump motor damage. Also, if the measurement value of the water pressure sensor 253 is an abnormal value, damage to the pipe 210 or the tank 240 is possible.

[0053] The abnormality detection unit 723 outputs the estimated cause of damage and the occurrence of the damage to the drive unit control unit 71 and the input / output device 100 (step S18). The drive unit control unit 71 controls the elevator car 31 to ascend and descend in a safety mode according to the cause of the damage (step S19). The safety mode is an operation in which the elevator car 31 has a lower acceleration and speed than in normal operation. By operating in the safety mode, the amount of heat generated by the inverter 93 is suppressed, and it is possible to prevent the inverter 93 from being damaged before a safety inspection is performed. The safety mode also includes stopping the elevator car 31 at the nearest floor and stopping the elevator car 31 from ascending or descending until the safety inspection is completed.

[0054] As described above, the elevator abnormality detection device 72 according to the embodiment compares the measurement values ​​(measured values ​​of the drive current value, water pressure value, flow rate value, vibration value, and sound value of the pump 220) measured each time the car 31 goes up and down with the reference values ​​(normal values ​​of the drive current value, water pressure value, flow rate value, vibration value, and sound value of the pump 220), and detects that an abnormality has occurred in the water-cooled cooling device 200 when the difference between the measurement value and the reference value exceeds a predetermined value. This allows the elevator abnormality detection device 72 according to the embodiment to improve the accuracy of detecting damage to the water-cooled cooling device 200 used in the elevator system.

[0055] In addition, the elevator abnormality detection device 72 of the embodiment can estimate the cause of damage to the water-cooled cooling device 200 by comparing the measured values ​​of the drive current, water pressure, water flow rate, vibration, and sound of the pump 220 measured each time the car 31 goes up and down with reference values ​​(the drive current value, water pressure value, flow rate value, vibration value, and sound value of the pump 220 under normal conditions).

[0056] Furthermore, the elevator abnormality detection device 72 according to the embodiment has reference values ​​according to the load, travel distance, car operation frequency, and environmental temperature, and compares the reference values ​​according to the load, travel distance, car operation frequency, and environmental temperature to detect the occurrence of an abnormality in the water-cooled cooling device 200 and estimate the cause of damage to the water-cooled cooling device 200. The elevator abnormality detection device 72 according to the embodiment compares the temperature with the normal temperature taking into account the parameter conditions classified in detail, thereby improving the accuracy of detecting damage to the water-cooled cooling device 200 used in the elevator system and improving the accuracy of estimating the cause of damage to the water-cooled cooling device 200.

[0057] In the above description, the current sensor 250, the vibration sensor 251, the noise sensor 252, the water pressure sensor 253, and the water flow sensor 254 are provided as sensors for detecting abnormalities in the water-cooled cooling device 200, but any of these sensors may be omitted. One or more sensors may be omitted.

[0058] When the car 31 ascends or descends, it accelerates from a stopped state, then reaches a constant speed, and decelerates before stopping. The output current of the inverter 93 reaches a maximum during this acceleration, and the temperature measured by the temperature sensor 97 also reaches a maximum during this acceleration. The flow rate of water driven by the pump 220 can also be controlled in accordance with this temperature change. In this case, the drive current of the pump 220 reaches a maximum when the car 31 accelerates. The above-mentioned determination of abnormality detection based on the drive current of the pump 220 may be made by comparing the maximum value of the drive current, by comparing the drive current when the car 31 is at a constant speed, or by comparing the average value during one ascending or descending movement.

[0059] In the above description, the driving current of the pump 220 is measured by the current sensor 250, and the vibration sensor 251 and the noise sensor 252 are disposed near the pump 220. Furthermore, by measuring the driving current of the radiator 230 by the current sensor and disposing the vibration sensor and the noise sensor near the radiator 230, it is also possible to obtain information for estimating a failure of the radiator 230. By disposing a sensor for each component constituting the water-cooled cooling device 200 in this way, it is possible to improve the accuracy of estimating the cause of damage.

[0060] Also, in the above description, the drive unit control unit 71 controls the pump motor control unit 222 according to the operating status of the car 31, thereby controlling the flow rate of water caused by the pump 220 so that the temperature of the heating element 921 of the inverter 93 is equal to or lower than a predetermined temperature. Some simple water-cooled cooling devices keep the flow rate of water caused by the pump 220 constant regardless of the operating status of the car 31. Others omit the tank 240 or the radiator 230.

[0061] Regular inspections of elevator systems are typically performed every few months. For example, if a crack occurs in the piping 210 of the water-cooled cooling system 200, the water in the piping 210 and tank 240 will run out before the next regular inspection, reducing the cooling effect. In this case, the semiconductors that make up the inverter 93 cannot be cooled, increasing the likelihood of the inverter 93 being damaged. Therefore, it is desirable to perform inspections using the elevator abnormality detection device 72, for example, every time the car 31 is operated up or down, or daily, such as at night.

[0062] (Variation 1) In the above description, water is passed through the pipe 210 as a cooling medium. However, the medium for cooling the heat sink 300 does not need to be limited to water. For example, various gases known as fluorocarbons used in air conditioning systems may also be used. In this case, the water-cooled cooling device 200 shown in FIG. 5 may have, for example, an expansion valve instead of the pump 220, and a compressor between the heat sink 300 and the radiator 230.

[0063] (Embodiment 2) In the first embodiment, a technique for improving the accuracy of estimating the cause of damage by providing a sensor for each component constituting the water-cooled cooling device 200 has been described. However, there are other methods for estimating the cause of failure. For example, the cause of damage can be estimated from the frequency component of noise superimposed on the current waveform measured by the current sensor 250.

[0064] The pump 220 and the radiator 230 that constitute the water-cooled cooling device 200 have resonant frequencies that correspond to their respective operating speeds, sizes, and shapes. The pipes 210 and the tank 240 also have resonant frequencies that correspond to their respective sizes and shapes. If an abnormality occurs in any of the components that constitute the water-cooled cooling device 200, these resonant frequencies also change. For example, if the brushes of the pump motor wear out, the contact resistance of the worn part differs from the contact resistance of the unworn part, and noise is generated due to the difference in contact resistance. The frequency component of this noise is a frequency component that is not present under normal conditions. Furthermore, if a crack occurs in the pipe 210, the resonant frequency of the pipe 210 changes, and the frequency of the superimposed noise also changes.

[0065] Noise due to these resonant frequencies is superimposed on the current waveform measured by the current sensor 250. By comparing the frequency components (frequency spectrum distribution) of the superimposed noise when all components of the water-cooled cooling device 200 are normal, it is possible to estimate which component of the water-cooled cooling device 200 has an abnormality.

[0066] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as set forth in the claims. [Explanation of symbols]

[0067] 10...Elevator device 11...Elevator shaft 21~24...Guide rail 31...Ride car 31a...Opening 32...door 35...Counterweight 36...Operation panel 37...Load sensor 38...Temperature sensor 40...Lift motor 41...Opening and closing motor 42...pulley 43...Wire 70...Control panel 71...Drive unit control section 72...Anomaly detection device 721...Operation status monitoring unit 722...Storage section 723...Abnormality detection unit 80...Control unit 90...Drive unit 91...Converter 93...Inverter 96...Power sensor 97...Temperature sensor 100...input / output device 200…Water-cooled cooling device 210...Plumbing 220...Pump 222...Pump motor control unit 230...Radiator 240...Tank 250...Current sensor 251...Vibration sensor 252...Noise sensor 253...Water pressure sensor 254...Water flow sensor 300...heat sink 310…Heating plate 320...Heat dissipation fin 350...fan 921...heating element

Claims

1. An elevator abnormality detection device that detects an abnormality in a water-cooled cooling device that cools a power source that supplies power to a motor that drives the lifting and lowering of a car, The water-cooling type cooling device is a pipe having water as a refrigerant therein and cooling a heat sink that cools the power supply; a pump for moving water flowing through the pipe; a radiator that cools the water flowing through the pipe; and at least one sensor selected from the group consisting of a current sensor that measures the current driving the pump, a water pressure sensor that measures the water pressure of the water flowing in the pipe, a water flow sensor that measures the flow rate of the water flowing in the pipe, a vibration sensor that measures the vibration generated by the pump or the radiator, and a noise sensor that measures the sound generated by the pump or the radiator; a storage unit that stores at least one of the following as a reference value: a drive current value of the pump in a normal state; a water pressure value in the pipe in a normal state; a flow rate value of water flowing in the pipe in a normal state; a vibration value generated by the water-cooled cooling device in a normal state; and a sound value generated by the water-cooled cooling device in a normal state; The measured value of at least one of the drive current value measured each time the elevator car goes up and down, the water pressure value in the pipe, the flow rate of water flowing through the pipe, the vibration value generated by the water-cooled cooling device, and the sound generated by the water-cooled cooling device is compared with the reference value, and the measured value an abnormality detection unit that detects that an abnormality has occurred in the water-cooling type cooling device when a difference between the reference value and the actual value exceeds a predetermined value; An elevator abnormality detection device having the above.

2. An elevator abnormality detection device that detects an abnormality in a water-cooled cooling device that cools a power source that supplies power to a motor that drives the lifting and lowering of a car, The water-cooling type cooling device is a pipe having water as a refrigerant therein and cooling a heat sink that cools the power supply; a pump for moving water flowing through the pipe; and a current sensor that measures the current that drives the pump; a storage unit that stores a value of the drive current of the pump in a normal state as a reference value; an abnormality detection unit that compares a measurement value of the drive current of the pump measured by the current sensor with the reference value each time the elevator car goes up and down, and detects that an abnormality has occurred in the water-cooled cooling device when a difference between the measurement value and the reference value exceeds a predetermined value; An elevator abnormality detection device having the above.

3. An elevator abnormality detection device that detects an abnormality in a water-cooled cooling device that cools a power source that supplies power to a motor that drives the lifting and lowering of a car, The water-cooling type cooling device is a pipe having water as a refrigerant therein and cooling a heat sink that cools the power supply; a pump for moving water flowing through the pipe; and a water pressure sensor that measures the water pressure of the water flowing through the pipe; a storage unit that stores a water pressure value in the pipe under normal conditions as a reference value; an abnormality detection unit that compares the water pressure measurement value in the pipe measured by the water pressure sensor with the reference value each time the elevator car ascends or descends, and detects that an abnormality has occurred in the water-cooled cooling device when the difference between the measurement value and the reference value exceeds a predetermined value; An elevator abnormality detection device having the above.

4. An elevator abnormality detection device that detects an abnormality in a water-cooled cooling device that cools a power source that supplies power to a motor that drives the lifting and lowering of a car, The water-cooling type cooling device is a pipe having water as a refrigerant therein and cooling a heat sink that cools the power supply; a pump for moving water flowing through the pipe; and a water flow sensor that measures the flow rate of water flowing through the pipe; a storage unit that stores a flow rate of water flowing through the pipe under normal conditions as a reference value; an abnormality detection unit that compares a measurement value of the flow rate of water flowing through the pipe measured by the water flow sensor with the reference value each time the elevator car ascends or descends, and detects that an abnormality has occurred in the water-cooled cooling device when a difference between the measurement value and the reference value exceeds a predetermined value; An elevator abnormality detection device having the above.

5. An elevator abnormality detection device that detects an abnormality in a water-cooled cooling device that cools a power source that supplies power to a motor that drives the lifting and lowering of a car, The water-cooling type cooling device is a pipe having water as a refrigerant therein and cooling a heat sink that cools the power supply; a pump for moving water flowing through the pipe; a radiator that cools the water flowing through the pipe; and a vibration sensor that measures vibrations generated by the pump or the radiator; a storage unit that stores a value of vibration generated by the water-cooling type cooling device under normal conditions as a reference value; an abnormality detection unit that compares a measurement value of vibrations generated by the water-cooled cooling device measured by the vibration sensor each time the car goes up and down with the reference value, and detects that an abnormality has occurred in the water-cooled cooling device when a difference between the measurement value and the reference value exceeds a predetermined value; An elevator abnormality detection device having the above.

6. An elevator abnormality detection device that detects an abnormality in a water-cooled cooling device that cools a power source that supplies power to a motor that drives the lifting and lowering of a car, The water-cooling type cooling device is a pipe having water as a refrigerant therein and cooling a heat sink that cools the power supply; a pump for moving water flowing through the pipe; a radiator that cools the water flowing through the pipe; and a noise sensor that measures a sound emitted by the pump or the radiator; a storage unit that stores a value of a sound emitted by the water-cooling type cooling device under normal conditions as a reference value; an abnormality detection unit that compares a measurement value of the sound emitted by the water-cooled cooling device measured by the noise sensor each time the car goes up and down with the reference value, and detects that an abnormality has occurred in the water-cooled cooling device when a difference between the measurement value and the reference value exceeds a predetermined value; An elevator abnormality detection device having the above.

7. The storage unit has reference values ​​according to the load, the mileage, the operating frequency of the elevator car, and the environmental temperature, the abnormality detection unit detects that an abnormality has occurred in the water-cooling cooling device by comparing the water-cooling cooling device with reference values ​​according to the load, the mileage, the operating frequency of the elevator car, and the environmental temperature; 7. An elevator abnormality detection device according to claim 1.

8. 8. The elevator abnormality detection device according to claim 7, wherein the power per unit time supplied by the power source to the motor that drives the elevator car to move up and down is used as an index indicating the operating status of the elevator car, including the load on the elevator car, the traveling distance, and the operating frequency of the elevator car.

9. The abnormality detection unit estimates the cause of damage to the water-cooled cooling device by comparing at least one of the measured values ​​of the drive current value measured each time the elevator car goes up and down, the water pressure value in the piping, the flow rate of water flowing through the piping, the vibration value generated by the water-cooled cooling device, and the sound value generated by the water-cooled cooling device with the reference value.

7. An elevator abnormality detection device according to claim 1.

10. a temperature sensor for measuring the temperature of a heat generating element constituting the power supply; The pump causes the water flowing through the pipe to flow so that the temperature measured by the temperature sensor becomes a predetermined temperature.

7. An elevator abnormality detection device according to claim 1.

11. When the abnormality detection unit detects that an abnormality has occurred in the water-cooled cooling device, it notifies a control unit that controls a motor that drives the elevator car to raise and lower, that an abnormality has occurred; The control unit controls the elevator car to raise and lower by limiting the current required for raising and lowering the elevator car. The elevator abnormality detection device according to any one of claims 1 to 6.

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