Elevator abnormality detection device and elevator abnormality detection method

Abstract

Identify the cause of damage to water-cooled cooling devices used in elevator systems. [Solution] An elevator abnormality detection device according to an embodiment is an elevator abnormality detection device that detects abnormalities in a water-cooled cooling device that cools a power supply that supplies power to a motor that drives the elevator car's elevation. The elevator abnormality detection device according to an embodiment includes a temperature sensor, a memory unit, and an abnormality detection unit. The temperature sensor measures the temperature of a heat-generating element that constitutes the power supply when the elevator car is moving up or down. The memory unit stores, as a normal reference value, the temperature of the heat-generating element measured by the temperature sensor at a predetermined timing from the start of elevator car elevation to the stop of elevator car elevation when the components that constitute the water-cooled cooling device are normal. The abnormality detection unit compares the reference value with the temperature of the heat-generating element measured each time the elevator car moves up or down, and detects an abnormality in the water-cooled cooling device if the difference between the two temperatures exceeds a predetermined value.

Description

[Technical Field]

[0001] An embodiment of the present invention relates to an elevator abnormality detection device and an elevator abnormality detection method. [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 switching elements (semiconductors) of the inverter power supply. The water in the pipe is moved by a pump and dissipated 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, the cause of damage to the cooling device can be identified. [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 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 decline in cooling effectiveness varies. Therefore, it is difficult to identify the cause of damage to a water-cooled cooling system. 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 identify the cause of damage to a water-cooled cooling device used in an elevator system. [Means for solving the problem]

[0009] The elevator abnormality detection device according to the embodiment for solving the above problem is an elevator abnormality detection device that detects abnormalities in a water-cooled cooling device that cools a power source that supplies power to a motor that drives the elevator car to move up and down. The elevator abnormality detection device according to the embodiment has a temperature sensor, a memory unit, and an abnormality detection unit. The temperature sensor measures the temperature of a heat generating element that constitutes the power source when the elevator car is operating up and down. The memory unit stores, as a normal reference value, the temperature of the heat generating element measured by the temperature sensor at a predetermined timing from the start of the elevator car's up and down movement until the elevator car stops, when the components that constitute the water-cooled cooling device are normal. In the event that the components of the water-cooled cooling device are damaged, the temperature of the heating element at a predetermined timing from the start of the elevator car moving up and down until the elevator car stops moving up and down is stored as a reference value at the time of damage. The abnormality detection unit compares the temperature of the heating element measured each time the elevator car goes up and down with a reference value, and detects an abnormality in the water-cooling device if the difference between the two temperatures exceeds a predetermined value. The cause of damage to the water-cooled cooling device is estimated by comparing the reference value at the time of damage with the temperature of the heating element measured each time the car goes up and down. do. [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] 5A and 5B are diagrams for explaining temperature changes of a heat generating element of the inverter according to the embodiment. [Figure 8] 5A and 5B are diagrams for explaining temperature changes of a heat generating element of the inverter according to the embodiment. [Figure 9] 10A and 10B are diagrams for explaining how the abnormality detection unit according to the present embodiment identifies the cause of damage. [Figure 10] 4 is a flowchart for explaining an abnormality detection process performed by the elevator abnormality detection device 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 second temperature sensor 38 that measures 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 second 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 measures the load carried on the car 31. The second temperature sensor 38 measures the temperature inside the elevator shaft 11 (for example, near the control panel 70).

[0022] 2 drives the lift motor 40 and the opening / closing motor 41 (not shown in FIG. 1) that drives the door 32 of the car 31 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 power supplied to the elevator motor 40 is provided at the output of the inverter 93. A temperature sensor 97 that measures the temperature of the heating element is provided near the heating element (for example, near the switching element) that constitutes the inverter 93. The temperature sensor 97 measures the temperature of the heating element that constitutes the inverter 93 (power supply) when the car 31 is operating up and down.

[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.

[0026] The auxiliary memory unit also stores various parameters and a graph showing the temperature change of the heating element constituting the inverter 93 as the car 31 rises and falls. Specifically, the auxiliary memory unit stores, as a normal reference value, the temperature of the heating element measured by the temperature sensor at a predetermined timing from the start of the lifting and lowering of the car 31 to the stop of the lifting and lowering when the components constituting the water-cooled cooling device are normal. The auxiliary memory unit also stores, as a graph serving as a normal reference value, a graph showing the temperature change from the start of the lifting and lowering of the car 31 to the stop of the lifting and lowering when the components constituting the water-cooled cooling device are damaged. The auxiliary memory unit also stores, as a graph serving as a reference value when the components constituting the water-cooled cooling device are damaged, the temperature of the heating element at a predetermined timing from the start of the lifting and lowering of the car 31 to the stop of the lifting and lowering. The auxiliary memory unit also stores, as a graph serving as a reference value when the components constituting the water-cooled cooling device are damaged, a graph showing the temperature change from the start of the lifting and lowering of the car 31 to the stop of the lifting and lowering.

[0027] 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.

[0028] FIG. 4 is a conceptual diagram of a heat sink 300 used in the inverter 93. The heating elements 921 are switching elements that constitute the inverter 93. Here, eight heating elements 921 are arranged as shown in FIG. 4. A heat sink 300 is provided to cool the multiple heating elements 921. The heat sink 300 has a heat transfer plate 310 arranged in contact with the multiple heating 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) in contact with the heating elements 921. The heat transfer plate 310 is provided with multiple pipes 210. The inverter 93 may have multiple boards as shown in FIG. 4. A temperature sensor 97 may be provided for each board or for each heating element 921.

[0029] 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.

[0030] 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 and cools a heat sink 300 of 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 circulates water flowing through the pipe 210. 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 disposed, for example, between the radiator 230 and the pump 220.

[0031] 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.

[0032] 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.

[0033] 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 graph creation unit 722, an abnormality detection unit 723, and a storage unit 724.

[0034] The operation status monitoring unit 721 monitors the operation status of the car 31, such as the load, mileage, and operation frequency. The heavier the load and the longer the mileage, the greater the output power of the inverter 93. Furthermore, the higher the operation frequency of the car, the higher the temperature of the switching elements constituting the inverter 93, since the inverter 93 operates before the temperature of the elements drops. The operation status monitoring unit 721 can acquire information on the load from the load sensor 37 and can acquire information such as the mileage and operation frequency of the car 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 operation status of the car 31. The power measured by the power sensor 96 provided in the drive unit 90 changes depending on the operation status, such as the load, mileage, and operation frequency of the car 31, and can therefore be used as an indicator of the operation status. For example, the operating condition monitoring unit 721 monitors the power measured by the power sensor 96 every hour.

[0035] The graph creation unit 722 creates a graph showing the temperature change from when the elevator car 31 starts to move up and down until when it stops moving up and down, based on the temperature data measured by the temperature sensor 97 provided in the inverter 93. The graph creation unit 722 links the amount of power indicating the operating status measured by the operating status monitoring unit 721 with the information on the created graph.

[0036] The memory unit 724 stores the graph created by the graph creation unit 722 when the water-cooling type cooling device 200 is operating normally as a graph that serves as a reference value for normal operation. The temperature of the heating element of the inverter 93 varies depending on operating conditions such as the load on the car 31, the mileage, and the operating frequency. The temperature of the heating element of the inverter 93 also varies depending on the season, depending on the environmental temperature where the inverter 93 is located. For example, even under the same operating conditions, the temperature of the heating element of the inverter 93 will be different in summer and winter, or in the daytime and at night. The memory unit 724 stores a graph that serves as a reference value for normal operation for each combination of parameters, using the hourly power amount measured by the power sensor 96 and the environmental temperature measured by the second temperature sensor 38 as parameters. This graph that serves as a reference value for normal operation is created for each mileage of the car 31.

[0037] In addition, the graphs serving as reference values ​​stored in the memory unit 724 also include a graph showing temperature changes when each component (pipe 210, pump 220, radiator 230, etc.) constituting the water-cooled cooling device 200 is damaged, and a graph serving as a threshold for determining whether the temperature is normal or abnormal.

[0038] FIG. 7 is an image diagram of the temperature change of the heating element 921 of the inverter 93 as the car 31 rises and falls. FIG. 7 shows an example in which the car 31 moves from the first floor to the tenth floor. FIG. 7(a) shows the change in speed of the car 31. The car 31 accelerates to a predetermined speed during the period from t0 to t1, and rises at the predetermined speed during the period from t1 to t4. Then, it decelerates just before the tenth floor, which is the destination floor (t4), and stops at the tenth floor, which is the destination floor (t5).

[0039] FIG. 7(b) is an image diagram of the change in the current supplied from the inverter 93 to the lift motor 40. A larger current is required to accelerate the car 31 than when ascending at a constant speed. Therefore, the current increases from t0 to t1, and decreases slightly from t1 to t2. From t2 to t3, the inverter 93 supplies the lift motor 40 with a current corresponding to the ascending and descending speed of the car 31. From t3 to t4, the current increases slightly to brake the ascending and descending of the car 31. From t4 to t5, the current supplied from the inverter 93 to the lift motor 40 decreases in accordance with the deceleration of the ascending and descending speed of the car 31.

[0040] 7(c) is an image diagram of the temperature change of the heating element 921 of the inverter 93 measured by the temperature sensor 97. The temperature of the heating element 921 changes in proportion to the value of the current shown in FIG. 7(b).

[0041] FIG. 8 is a diagram showing different temperature change patterns corresponding to the damage factors of the water-cooled cooling device 200. The solid line at the bottom of FIG. 8 is a graph showing the reference value when the water-cooled cooling device 200 is normal. When the water-cooled cooling device 200 is damaged, the cooling effect decreases. The degree of decrease in cooling effect varies depending on the damage factor. Here, three damage factors will be explained as examples. FIG. 9 is a table showing the relationship between temperature change patterns and damage factors. The graphs showing temperature changes of patterns 1 to 3 shown in FIG. 8 correspond to each damage factor.

[0042] The graph of Pattern 3 shown in FIG. 8 shows a slightly larger temperature rise than the graph showing the reference value under normal conditions (reference value under normal conditions). The graph of Pattern 3 shows temperature changes when, for example, the cause of damage is a partial stop of radiator 230 or clogging of radiator 230. A partial stop of radiator 230 refers to a case where radiator 230 is operating but a fan included in radiator 230 has stopped. If radiator 230 has multiple fans, this also includes a case where any of the fans has stopped. The graph of Pattern 2 shown in FIG. 8 shows a larger temperature rise than Pattern 3. The graph of Pattern 2 shows temperature changes when, for example, the cause of damage is a complete stop of radiator 230 or a small amount of water leaking due to a crack in pipe 210 or tank 240. The graph of Pattern 1 shown in FIG. 8 shows a larger temperature rise than Pattern 2. The graph of Pattern 1 shows temperature changes when, for example, the cause of damage is a pump breakage or a large amount of water leaking due to a crack in pipe 210 or tank 240. This also includes a case where the joint of the pipe 210 is damaged and cold water is not supplied to the pipe 210 passing through the heat sink 300.

[0043] The elevator car 31 is raised and lowered while a hypothetical damage factor is intentionally created, and graphs are created by the graph creation unit 722. These graphs are then stored in the storage unit 724 as graphs (graphs of pattern 1, pattern 2, and pattern 3) that serve as reference values ​​when a damage factor is present. The graphs shown by dashed lines in Fig. 8 are graphs that serve as thresholds for determining whether something is normal or abnormal. The graphs that serve as thresholds are set so that they are located between the graph that serves as the reference value for normal times, shown by the solid line at the bottom of Fig. 8, and the graph of pattern 3, which shows the smallest deterioration in cooling effect.

[0044] The graphs showing the reference values ​​at the time of breakage (reference values ​​at the time of breakage) and the graphs showing the reference values ​​at normal times (reference values ​​at normal times) for patterns 1 to 3 shown in Fig. 8 are created by changing the combination of parameters, using the load on the car 31, the travel distance, the operating frequency (the total value of the output current of the inverter 93 per hour), and the environmental temperature measured by the second temperature sensor 38 as parameters. The graphs showing the reference values ​​shown in Fig. 8 are created for each combination of parameters and stored in the memory unit 724.

[0045] Returning to FIG. 6, the abnormality detection unit 723 detects an abnormality by comparing a graph serving as a reference value with a graph created by the graph creation unit 722 for each ascending and descending movement of the car 31. Specifically, the abnormality detection unit 723 uses the amount of power per hour measured by the power sensor 96, the ambient temperature measured by the second temperature sensor 38, and the travel distance measured during the ascending and descending operation of the car 31 as parameters, and extracts a graph serving as a reference value corresponding to these parameters from the storage unit 724. Then, the abnormality detection unit 723 compares the graph created by the graph creation unit 722 corresponding to the ascending and descending movement of the car 31 with the reference value (graph serving as a reference value) extracted from the storage unit 724. Then, the abnormality detection unit 723 detects that an abnormality has occurred in the water-cooling type cooling device 200 when the temperature difference between them (the temperature difference between the intervals t2 and t3 in FIG. 7) exceeds a predetermined value. Specifically, when the graph created by the graph creating unit 722 in response to the ascent and descent of the car 31 exceeds the threshold indicated by the dotted line in FIG. 8, it is detected that an abnormality has occurred.

[0046] 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 in 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.

[0047] Next, an elevator abnormality detection method will be described with reference to the flowchart shown in Fig. 10. 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).

[0048] A reference value is acquired before operating the elevator apparatus 10 (step S11). Specifically, a graph showing the temperature change of the heating element 921 when the components constituting the water-cooled cooling device 200 are normal is stored in the storage unit 724 as a reference graph for normal times (the solid line graph at the bottom of FIG. 8). The temperature of the heating element 921 at a predetermined timing from the start of the elevator car 31 moving up and down until it stops moving up and down when the components constituting the water-cooled cooling device 200 are normal is the reference temperature for normal times. Also, a graph showing the temperature change of the heating element 921 when a component constituting the water-cooled cooling device 200 is damaged is stored in the storage unit 724 as a reference graph for when the component is damaged (the graphs of patterns 1 to 3 in FIG. 8). The temperature of the heating element 921 at a predetermined timing from the start of the elevator car 31 moving up and down until it stops moving up and down when the component constituting the water-cooled cooling device 200 is damaged is the reference temperature for when the component is damaged. Step S11 is a storage process.

[0049] The reference graph in the normal state and the reference graph in the event of damage are obtained under conditions in which the combination of parameters of the load, travel distance, operating frequency, and environmental temperature measured by the second temperature sensor 38 of the car 31 are changed. Here, the power per unit time supplied by the inverter 93 to the lift motor 40 that drives the lifting and lowering of the car 31 is used as an index indicating the operating state of the car 31, including the load, travel distance, and operating frequency of the car 31. By using the power per unit time supplied by the inverter 93 to the lift motor 40 that drives the lifting and lowering of the car 31 as an index indicating the operating state of the car 31, including the load, travel distance, and operating frequency of the car 31, it is possible to reduce the number of pieces of parameter data to be obtained. Furthermore, since the number of parameter combinations can be reduced, it is possible to reduce the CPU processing load.

[0050] 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).

[0051] 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.

[0052] If the elevator car 31 is moving up or down (step S13: Yes), the operation status monitoring unit 721 acquires information on the load weight of the elevator car 31 from the load sensor 37, acquires information on the travel distance of the elevator car 31 from the drive unit control unit 71, and acquires information on the ambient temperature from the second temperature sensor 38 (step S14). 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.

[0053] Next, the graph creation unit 722 acquires the temperature of the heating element 921 during the raising and lowering operation of the car 31 from the temperature sensor 97. The process of acquiring the temperature of the heating element 921 during the raising and lowering operation of the car 31 from the temperature sensor 97 is a temperature measurement process. Then, the graph creation unit 722 creates a graph (the graph in FIG. 7(c)) showing the change in the heating element 921 of the inverter 93 accompanying the raising and lowering of the car 31 (step S15).

[0054] Next, the abnormality detection unit 723 extracts from the storage unit 724 a graph showing the reference values ​​shown in Fig. 8 corresponding to the parameters of the loaded weight of the car 31, the travel distance of the car 31, the operating status, and the ambient temperature acquired by the operation status monitoring unit 721. Then, by comparing the graph showing the temperature change created in step S15 with a graph showing the threshold value of the graph showing the reference values ​​(the graph shown by the dotted line in Fig. 8), it is determined whether or not there is an abnormality in the water-cooling type cooling device 200 (step S16). Step S16 is an abnormality detection step.

[0055] If the graph showing the temperature change created by the graph creation unit 722 exceeds the threshold of the reference graph (step S16: Yes), the abnormality detection unit 723 determines that damage has occurred in the water-cooled cooling device 200. Furthermore, the abnormality detection unit 723 determines which of Patterns 1 to 3 the graph showing the temperature change created by the graph creation unit 722 in step S14 is closest to, and estimates the cause of the damage to the water-cooled cooling device 200 based on the correspondence table shown in Fig. 9 (step S17).

[0056] The abnormality detection unit 723 outputs the occurrence of damage and the estimated cause of the damage to the drive unit control unit 71 and the input / output device 100 (step S18). The drive unit control unit 71 drives the car 31 in a safety mode according to the cause of the damage (step S19). The safety mode is an operation in which the lifting acceleration and lifting speed of the car 31 are reduced compared to normal operation. By operating in the safety mode, the amount of heat generated by the inverter 93 is reduced, and damage to the inverter 93 can be suppressed.

[0057] As described above, the elevator abnormality detection device 72 according to the embodiment detects an abnormality in the water-cooled cooling device 200 based on the degree of deviation between the temperature measured each time the car 31 ascends and descends and the reference value. Specifically, the elevator abnormality detection device 72 according to the embodiment uses the temperature of the water-cooled cooling device 200 measured by the temperature sensor 97 at a predetermined timing from the start of ascending and descending of the car 31 to the stop of ascending and descending as a reference value, and detects an abnormality by comparing the temperature measured each time the car 31 ascends and descends with the reference value. By determining an abnormality in this manner, the elevator abnormality detection device 72 according to the embodiment can accurately detect an abnormality in the water-cooled cooling device 200.

[0058] Furthermore, the elevator abnormality detection device 72 according to the embodiment uses the temperature at a predetermined timing from the start of ascending or descending of the car 31 to the stop of ascending or descending when the components constituting the water-cooled cooling device 200 are damaged as a reference value at the time of damage, and estimates the cause of damage to the water-cooled cooling device 200 by comparing the reference value at the time of damage with the temperature measured for each ascending or descending of the car 31. In this way, the elevator abnormality detection device 72 according to the embodiment can identify the cause of damage to the water-cooled cooling device 200 used in the elevator system.

[0059] Furthermore, the elevator abnormality detection device 72 according to the embodiment has a reference value according to a combination of parameters of the car 31, including the load, travel distance, operation frequency, and environmental temperature, and compares the reference value according to the combination of parameters of the car 31, including the load, travel distance, operation frequency, and environmental temperature to detect 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 a normal reference value according to a finely classified parameter condition (combination of parameters) with a measured value for each up-down operation of the car 31, thereby improving the accuracy of detecting damage to the water-cooled cooling device 200 used in the elevator system. Furthermore, the elevator abnormality detection device 72 according to the embodiment compares a damage reference value according to a finely classified parameter condition with a measured value for each up-down operation of the car 31, thereby improving the accuracy of estimating the cause of damage to the water-cooled cooling device 200.

[0060] Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, in the above description, for ease of understanding, it has been explained that the graph creation unit 722 creates a graph such as that shown in FIG. 8. However, the graph creation unit 22 does not need to create a graph such as that shown in FIG. 8, and it is sufficient if it records time-series data as a set of (time, temperature). The abnormality detection unit 723 determines the presence or absence of an abnormality and estimates the cause of damage based on this time-series data.

[0061] Furthermore, the time from when the car 31 starts ascending or descending until it reaches a certain speed is determined by the ascending or descending distance of the car 31. Therefore, the time until it reaches the middle of t2 and t3 in FIG. 8 is also determined by the ascending or descending distance of the car 31. The abnormality detection unit 723 may obtain temperature information from the temperature sensor 97 at this timing and determine whether or not an abnormality has occurred. In this case, the graph creation unit 722 can be omitted.

[0062] Although not explained above, a graph showing the reference values ​​in normal and damaged states when the combination of the parameters of the load on the car 31, the travel distance, the operating frequency (the total output current of the inverter 93 per hour), and the environmental temperature measured by the second temperature sensor 38 is changed can be created by operating the car 31 up and down in a state where the damage factors shown in Fig. 9 are intentionally created, and measuring the temperature change by actual measurement. Also, a graph showing the reference values ​​in normal and damaged states can be created by a simulation in which the damage factors and parameters are changed.

[0063] 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 damaging the inverter 93. 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 every day, such as at night.

[0064] (Variation 1) In the above description, a case where an abnormality in the water-cooled cooling device 200 is detected by comparing the temperatures between t2 and t3 in FIG. 8 has been described. In another embodiment, a graph showing the reference values ​​for normal and damaged conditions shown in FIG. 8 may be compared with a graph created for each ascending and descending movement of the car 31. This involves a larger amount of processing than a process that compares temperatures at a predetermined timing (one point) from the start of ascending and descending of the car 31 to the end of ascending and descending. However, a malfunction may cause the temperature graph to have a waveform different from normal, and by comparing the graphs, it may be possible to detect such an abnormality. Alternatively, the peak temperature value (the temperature at time t1 in FIG. 8) may be compared.

[0065] (Variation 2) In the above description, water is passed through the pipe 210. However, the medium for cooling the heat sink 300 does not have to be limited to water. For example, various gases known as fluorocarbons used in air conditioners may also be used. In this case, the water-cooled cooling device 200 shown in FIG. 5 would have an expansion valve instead of the pump 220, and a compressor between the heat sink 300 and the radiator 230.

[0066] (Embodiment 2) In the second embodiment, a case where AI (Artificial Intelligence) is used in the anomaly detection unit 723 will be described. When AI is used in the anomaly detection unit 723, the reference values ​​(reference graphs) of the water-cooled cooling device 200 in normal and damaged states described in step S11 of the first embodiment are stored as supervised data in the storage unit 724. Specifically, the graph shown in FIG. 8 can be used as the supervised data. The supervised data in the damaged state is data linked to the cause of the damage shown in FIG. 9. The supervised data in the normal state is linked to information such as "no damage." The supervised data is created using data with different combinations of parameters, including the load on the car 31, the mileage, the operating frequency, and the environmental temperature measured by the second temperature sensor 38. It is also desirable that the supervised data have a large number of graphs measured under the same conditions. The supervised data may be created by simulation.

[0067] In step S15, the information on the load weight of the car 31, the information on the travel distance of the car 31, and the information on the ambient temperature from the second temperature sensor 38 acquired in step S14 are linked to the graph created in step S15 showing changes in the heating element 921 of the inverter 93 accompanying the elevation and descent of the car 31. Then, in step S16, the AI ​​compares the supervised data stored in the memory unit 724 with the graph created in step S15 for each elevation and descent of the car 31, thereby determining whether or not there is an abnormality in the water-cooled cooling device 200.

[0068] If the AI ​​determines that the graph created for each elevator car 31 ascends and descends has the highest correlation with the supervised data of "no damage," it concludes that there is no abnormality in the water-cooled cooling device 200 (step S16: No).

[0069] On the other hand, if the AI ​​determines that the graph created for each elevator car 31 ascending and descending is most highly correlated with the graphs of patterns 1 to 3 in Figure 8, it estimates the cause of damage as the cause of damage indicated by the supervised data at the time of the most correlation (step S17).

[0070] The supervised data may be changed to the graph shown in FIG. 8, and the peak temperature at t1 in FIG. 8 or the temperature between t2 and t3 in FIG. 8 may be used.

[0071] 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]

[0072] 10...Elevator device 11...Elevator shaft 21~24...Guide rail 31...Car 31a...Opening 32...door 35...Counterweight 36...Operation panel 37...Load sensor 38...Second 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...Graph Creation Department 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 230...Radiator 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, a temperature sensor that measures the temperature of a heating element that constitutes the power supply when the elevator car is moving up and down; a storage unit that stores the temperature of the heating element measured by the temperature sensor at a predetermined timing from the start of lifting and lowering of the car to the stop of lifting and lowering when the equipment constituting the water-cooled cooling device is normal as a reference value in normal times, and stores the temperature of the heating element at a predetermined timing from the start of lifting and lowering of the car to the stop of lifting and lowering when the equipment constituting the water-cooled cooling device is damaged as a reference value in the event of damage; an abnormality detection unit that compares the reference value with the temperature of the heat generating element measured each time the car ascends or descends, and detects an abnormality in the water-cooled cooling device when the difference between the two temperatures exceeds a predetermined value, and estimates the cause of damage to the water-cooled cooling device by comparing the reference value at the time of damage with the temperature of the heat generating element measured each time the car ascends or descends; An elevator abnormality detection device comprising:

2. The normal reference value and the breakage reference value are set according to a combination of the load, travel distance, operating frequency, and environmental temperature of the elevator car. The elevator abnormality detection device according to claim 1.

3. The power per unit time supplied from the power source to the motor that drives the elevator car to move up and down is used as an index indicating the operating state of the elevator car, including the load, travel distance, and operating frequency of the elevator car. The elevator abnormality detection device according to claim 2.

4. a graph creation unit that creates a graph showing a temperature change from the start of lifting and lowering of the elevator car to the end of lifting and lowering based on the temperature data measured by the temperature sensor; the storage unit stores the graph created by the graph creation unit when the water-cooling type cooling device is normal as a graph that serves as a reference value for normal times; The abnormality detection unit detects an abnormality by comparing the graph representing the normal reference value with the graph created by the graph creation unit for each lifting and lowering of the elevator car. The elevator abnormality detection device according to claim 1.

5. the storage unit stores the graph created by the graph creation unit when an item constituting the water-cooled cooling device is damaged as a graph that serves as a reference value at the time of damage; The abnormality detection unit estimates a cause of damage to the water-cooled cooling device based on a reference graph at the time of the damage and a graph created by the graph creation unit for each lifting and lowering of the elevator car. The elevator abnormality detection device according to claim 4.

6. An elevator abnormality detection device that detects abnormalities 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, a temperature sensor that measures the temperature of a heating element that constitutes the power supply when the elevator car is moving up and down; a storage unit that stores the temperature of the heating element measured by the temperature sensor at a predetermined timing from the start of the elevator car moving up and down until the elevator car stops moving up and down when the equipment constituting the water-cooled cooling device is normal, as a reference value for normal times; an abnormality detection unit that compares the reference value with the temperature of the heating element measured each time the elevator car ascends or descends, and detects an abnormality in the water-cooled cooling device when a difference between the two temperatures exceeds a predetermined value; a graph creation unit that creates a graph showing a temperature change from the start of ascending or descending of the elevator car to the end of ascending or descending of the elevator car based on the temperature data measured by the temperature sensor; Equipped with the storage unit stores the graph created by the graph creation unit when the water-cooled cooling device is normal as a graph that is a reference value for normal times, and further stores the graph created by the graph creation unit when a component constituting the water-cooled cooling device is damaged as a graph that is a reference value for damaged times; The abnormality detection unit detects an abnormality by comparing the graph serving as a reference value in the normal state with a graph created by the graph creation unit for each ascending and descending movement of the car, and further estimates the cause of damage to the water-cooled cooling device based on the graph serving as a reference value in the event of damage and the graph created by the graph creation unit for each ascending and descending movement of the car. Elevator abnormality detection device.

7. An elevator abnormality detection method for detecting 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 an elevator car, comprising: a storage step of measuring the temperature of a heat generating element constituting a power source with a temperature sensor at a predetermined timing from the start of the elevator car rising and falling to the stop of the elevator car rising and falling, storing the temperature of the water-cooled cooling device in a normal state as a reference value for normal state, and storing the temperature of the water-cooled cooling device in a predetermined timing from the start of the elevator car rising and falling to the stop of the elevator car rising and falling as a reference value for the time of damage in the event that an item constituting the water-cooled cooling device is damaged; a temperature measurement step of measuring the temperature of a heating element constituting the power source every time the elevator car rises or falls; an abnormality detection process for detecting an abnormality in the water-cooled cooling device by comparing the temperature measured each time the elevator car ascends and descends with the reference value in the normal state, and for estimating the cause of damage to the water-cooled cooling device by comparing the temperature measured each time the elevator car ascends and descends with the reference value in the event of damage; An elevator abnormality detection method comprising:

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