Dew condensation prevention system of elevator hoist and dew condensation prevention method of elevator hoist

Abstract

To provide a dew condensation prevention system of an elevator hoist capable of accurately determining the necessity of a dew condensation prevention operation of an elevator hoist and capable of preventing the occurrence of a dew condensation in the hoist.SOLUTION: A dew condensation prevention system of an elevator hoist acquires the temperature and the relative humidity in a hoistway 1. The system comprises a dew point temperature calculation part 20 to calculate the dew point temperature T1 in the hoistway 1 from the acquired temperature and the relative humidity in the hoistway 1, a hoist temperature acquisition part 22 to acquire the temperature T2 of the hoist 6, a determination part 23 to determine the necessity of the dew condensation prevention operation to increase the temperature T2 of the hoist 6 when the temperature T2 of the hoist 6 calculated by the hoist temperature calculation part 22 is greater than the dew point temperature T1 calculated by the dew point temperature calculation part 20 and is less than the temperature with a predetermined threshold temperature T3 added to the dew point temperature T1, and a hoist control part 27 to perform the dew condensation prevention operation when the determination part 23 determines that the dew condensation prevention operation is required.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a condensation prevention system for an elevator hoist and a condensation prevention method for an elevator hoist. [Background technology]

[0002] In a conventional elevator condensation prevention system, the temperature and relative humidity in the area where the elevator is installed are obtained from a weather information service center, and the dew point temperature is calculated using the obtained temperature and relative humidity.Then, using the obtained temperature and the calculated dew point temperature, it is determined whether or not condensation prevention operation of the elevator, particularly the hoisting machine, is required, thereby preventing condensation from occurring (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-227235 A Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional elevator condensation prevention systems, there are cases where a difference occurs between the actual elevator temperature and dew point temperature and the temperature and dew point temperature obtained from a weather information service center.

[0005] In addition, in an elevator, the air from the hall may flow into the hoistway from the hall entrance, causing changes in the temperature and humidity of the hoistway and raising the dew point temperature of the hoistway. In this case, the hoistway hoist, which is located away from the hall entrance in the hoistway, is not directly affected by the air from the hall that flows in. As a result, the temperature of the hoistway may become lower than the dew point temperature of the raised hoistway, causing condensation on the hoistway. Conventional elevator condensation prevention systems have not taken into account the fact that environmental conditions inside the elevator may not be constant.

[0006] Therefore, in the conventional elevator condensation prevention system, when focusing on the hoist, it is not possible to accurately determine whether or not condensation prevention operation of the hoist is required, and there is a possibility that condensation will occur.

[0007] The present disclosure has been made to solve the problems described above, and aims to provide a condensation prevention system for an elevator hoist that can accurately determine whether or not condensation prevention operation of the hoist is necessary and prevent condensation from occurring on the hoist. [Means for solving the problem]

[0008] The condensation prevention system for an elevator hoist according to the present disclosure includes a dew point temperature calculation unit that acquires the temperature and relative humidity of the elevator shaft and calculates the dew point temperature of the elevator shaft from the acquired temperature and relative humidity of the elevator shaft; a hoist temperature acquisition unit that acquires the temperature of the hoist; a determination unit that determines that condensation prevention operation to raise the temperature of the hoist machine is necessary if the temperature of the hoist machine acquired by the hoist temperature acquisition unit is greater than the dew point temperature calculated by the dew point temperature calculation unit and is equal to or lower than a temperature obtained by adding a predetermined threshold temperature to the dew point temperature; and a hoist control unit that performs condensation prevention operation when the determination unit determines that condensation prevention operation is necessary.

[0009] The method for preventing condensation in an elevator hoisting machine according to the present disclosure includes a dew point temperature calculation step in which a temperature and relative humidity of the elevator shaft are acquired and a dew point temperature calculation unit calculates a dew point temperature of the elevator shaft from the acquired temperature and relative humidity of the elevator shaft; a hoisting machine temperature acquisition step in which a hoisting machine temperature acquisition unit acquires the temperature of the hoisting machine; a determination step in which a determination unit determines that anti-condensation operation is necessary to raise the temperature of the hoisting machine if the temperature of the hoisting machine acquired by the hoisting machine temperature acquisition unit is greater than the dew point temperature calculated by the dew point temperature calculation unit and is equal to or lower than a temperature obtained by adding a predetermined threshold temperature to the dew point temperature; and a hoisting machine control step in which a hoisting machine control unit performs anti-condensation operation if the determination unit determines that anti-condensation operation is necessary. Effect of the Invention

[0010] According to the present disclosure, it is possible to accurately determine whether or not anti-condensation operation of a hoisting machine is required, and it is possible to prevent condensation from occurring on the hoisting machine. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a configuration diagram of an elevator according to a first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view of the elevator hoisting machine according to the first embodiment. [Diagram 3] 1 is a configuration diagram of a condensation prevention system for an elevator hoist in accordance with a first embodiment. FIG. [Figure 4] 3 is a table stored in a storage unit according to the first embodiment. [Diagram 5] FIG. 2 is a diagram showing a hardware configuration of an elevator control panel in the first embodiment. [Figure 6] 4 is a flowchart showing the operation of the condensation prevention system for an elevator hoisting machine according to the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Embodiment 1 The configuration of an elevator according to the first embodiment will be described. FIG. 1 is a configuration diagram of an elevator according to the first embodiment. FIG. 2 is a cross-sectional view of a hoist 6 of the elevator according to the first embodiment. The elevator in FIG. 1 is a rope-type elevator without a machine room, in which ropes are hung by a 1:1 roping method. FIG. 1 also shows a state in which an elevator car 3 has arrived at a landing 2 on the top floor. FIG. 2 is a view of the AA cross section in FIG. 1, seen from the landing 2 side.

[0013] In FIG. 1, an elevator is provided with a hoistway 1 and a landing 2. The hoistway 1 is provided with a car 3 that moves vertically, a counterweight 4 that moves vertically, a rope 5 that connects the car 3 and the counterweight 4, a hoist 6 that fastens the rope 5, and a thermometer / hygrometer 18 provided on the hoistway 1 side of a wall surface that forms an entrance / exit of the landing 2. The car 3 has a car door 7 at the entrance / exit. In addition, the landing 2 on each floor has a landing door 8 at the entrance / exit. When the car 3 arrives at the landing 2, the car door 7 and the landing door 8 are connected by a connecting mechanism (not shown) and slide to open and close. The thermometer / hygrometer 18 measures the temperature and relative humidity of the hoistway 1.

[0014] In Figure 2, the hoist 6 comprises a sheave 9 around which the rope 5 is wound, a motor 10 that generates a driving force to rotate the sheave 9, a shaft 11 that transmits the driving force generated by the motor 10 to the sheave 9, a pair of bearings 12 that rotatably support the shaft 11, a control device 13 that controls the rotation of the sheave 9, and a base member 14 that supports the sheave 9, the motor 10 and the bearings 12.

[0015] The motor 10 includes a stator 15, a rotor 16, and a casing 17. The casing 17 houses the stator 15 and the rotor 16. The stator 15 is fixed to the casing 17. The stator 15 is composed of an iron core and a winding. The rotor 16 is arranged with a gap between it and the stator 15, and the end of the shaft 11 on the motor 10 side is press-fitted and fixed. When the winding of the stator 15 is energized, the magnetic field changes, and the rotor 16 rotates by interacting with the magnetic field of the stator 15, transmitting the driving force to the shaft 11. Usually, the winding of the stator 15 is made of an insulating material, and the iron core of the stator 15, the rotor 16, and the casing 17 are made of a conductive material.

[0016] When condensation occurs in the hoisting machine 6, water droplets may form on the equipment in the motor 10, or water may accumulate under the motor 10. Here, the winding of the stator 15 made of an insulating material may absorb moisture, which may increase the occurrence of partial discharge in the winding of the stator 15. Partial discharge indicates deterioration of the insulating material or poor insulation, and may cause insulation breakdown if it occurs continuously. Therefore, when the occurrence of partial discharge increases in the winding of the stator 15, insulation breakdown occurs, and eventually a short circuit occurs, causing a failure of the hoisting machine 6. A failure of the hoisting machine 6 is, for example, a failure of the brake of the hoisting machine 6 (not shown). Since the brake of the hoisting machine 6 operates by the back electromotive force of the stator 15, if the winding of the stator 15 is short-circuited, it may not operate normally, and the rotation of the hoisting machine 6 may not be stopped. Therefore, if condensation is prevented from occurring in the hoisting machine 6, the failure of the hoisting machine 6 can be avoided.

[0017] Next, a description will be given of the configuration of the condensation prevention system for the elevator hoist 6 according to embodiment 1. The condensation prevention system for the elevator hoist 6 according to embodiment 1 detects signs of condensation occurring on the hoist 6, and performs condensation prevention operation to prevent condensation from occurring on the hoist 6.

[0018] The dew condensation prevention operation refers to an operation in which the amount of heat generated by the hoisting machine 6 is increased in order to increase the temperature of the hoisting machine 6, particularly the temperature of the windings of the stator 15. The dew condensation prevention operation is, for example, an operation in which a voltage is applied to the motor 10 with the brake of the hoisting machine 6 applied to bring the hoisting machine 6 to a stationary state. When the hoisting machine 6 is driven in this manner, a load is applied to the motor 10, the amount of heat generated by the hoisting machine 6 increases, and the temperature of the hoisting machine 6 rises.

[0019] 3 is a configuration diagram of the dew condensation prevention system of the elevator traction machine 6 according to the first embodiment. The dew condensation prevention system of the elevator traction machine 6 includes a thermometer / hygrometer 18 provided in the hoistway 1, a stator 15 of the traction machine 6, a dew point temperature calculation unit 20, a resistance value measurement unit 21, a traction machine temperature acquisition unit 22, a determination unit 23, a required rise temperature calculation unit 24, a memory unit 25, a dew condensation prevention operation time acquisition unit 26, a traction machine control unit 27, and a notification unit 28. The functions of the dew point temperature calculation unit 20, the resistance value measurement unit 21, the traction machine temperature acquisition unit 22, the determination unit 23, the required rise temperature calculation unit 24, the memory unit 25, the dew condensation prevention operation time acquisition unit 26, the traction machine control unit 27, and the notification unit 28 are realized by an elevator control panel 19 provided in the elevator.

[0020] The dew-point temperature calculation unit 20 acquires the temperature and relative humidity of the hoistway 1 from the thermo-hygrometer 18, and calculates a dew-point temperature T1, which is a temperature at which condensation occurs in the hoistway 1, using the acquired temperature and relative humidity of the hoistway 1. As a method for calculating the dew-point temperature T1, for example, a psychrometric chart may be referenced to determine the dew-point temperature T1 corresponding to the acquired temperature and relative humidity.

[0021] The resistance value measuring unit 21 measures the resistance value RT2 of the windings of the stator 15. The resistance value measuring unit 21 is usually used to measure the resistance value RT2 of the windings of the stator 15 during regular maintenance.

[0022] The hoist temperature acquisition unit 22 acquires the temperature T2 of the hoist 6. For example, the hoist temperature acquisition unit 22 acquires the temperature T2 of the hoist 6 by calculating the temperature T2 of the hoist 6 using the resistance value RT2 of the winding of the stator 15 measured by the resistance value measurement unit 21. Here, the resistance value RT2 is expressed as in Equation 1 using the temperature T2 of the hoist 6, an arbitrary temperature t, a resistance value Rt at the temperature t, and a resistance temperature coefficient αt at the temperature t. By modifying Equation 1, the temperature T2 of the hoist 6 is expressed as in Equation 2. Therefore, the hoist temperature acquisition unit 22 calculates the temperature T2 of the hoist 6 by Equation 2 using the temperature t, resistance value Rt, and resistance temperature coefficient αt measured or calculated in advance, and the resistance value RT2 of the winding of the stator 15 measured by the resistance value measurement unit 21.

[0023]

number

[0024]

number

[0025] The determination unit 23 determines whether or not dew condensation prevention operation is required, using the dew point temperature T1 calculated by the dew point temperature calculation unit 20, the temperature T2 of the hoisting machine 6 acquired by the hoisting machine temperature acquisition unit 22, and a preset threshold temperature T3. Specifically, the determination unit 23 determines whether or not the temperature T2 of the hoisting machine 6 is higher than the dew point temperature T1. When the temperature T2 of the hoisting machine 6 is higher than the dew point temperature T1, the determination unit 23 determines whether or not the temperature T2 of the hoisting machine 6 is equal to or lower than the temperature obtained by adding the threshold temperature T3 to the dew point temperature T1. When the temperature T2 of the hoisting machine 6 is equal to or lower than the dew point temperature T1, the determination unit 23 determines that dew condensation has occurred in the hoisting machine 6.

[0026] Furthermore, when the temperature T2 of the hoisting machine 6 is equal to or lower than the temperature obtained by adding the dew-point temperature T1 to the threshold temperature T3, the determination unit 23 detects a sign of condensation occurring on the hoisting machine 6 and determines that condensation prevention operation is necessary to prevent condensation from occurring on the hoisting machine 6. Furthermore, when the temperature T2 of the hoisting machine 6 is higher than the temperature obtained by adding the dew-point temperature T1 to the threshold temperature T3, the determination unit 23 determines that condensation prevention operation is not necessary.

[0027] The threshold temperature T3 is set so that the temperature obtained by adding the threshold temperature T3 to the dew-point temperature T1 is slightly higher than the dew-point temperature T1. By setting the threshold temperature T3 in this manner, the temperature T2 of the hoisting machine 6 approaches the dew-point temperature T1, and the determination unit 23 can determine a sign that condensation will occur on the hoisting machine 6. The threshold temperature T3 is set to, for example, 3°C.

[0028] The required rise temperature calculation unit 24 uses the dew point temperature T1, the temperature T2 of the hoisting machine 6, and the threshold temperature T3 to calculate a required rise temperature T4, which is a rise temperature required for the temperature T2 of the hoisting machine 6 to become higher than the temperature obtained by adding the dew point temperature T1 to the threshold temperature T3. For example, when the dew point temperature T1 is 10°C, the temperature T2 of the hoisting machine 6 is 12.5°C, and the threshold temperature T3 is 3°C, the temperature obtained by adding the dew point temperature T1 to the threshold temperature T3 is 13°C, and the required rise temperature T4, which is the difference from the temperature T2 of the hoisting machine 6, is calculated to be 0.5°C. The required rise temperature calculation unit 24 may acquire the dew point temperature T1, the temperature T2 of the hoisting machine 6, and the threshold temperature T3 from the determination unit 23.

[0029] FIG. 4 is a table stored by the storage unit 25 according to the first embodiment. FIG. 4 shows a table corresponding to the case where the temperature of the hoistway 1 is 15° C. The storage unit 25 stores a table that associates the dew condensation prevention operation time, which indicates the time for which the dew condensation prevention operation is performed, with the temperature rise of the hoisting machine 6 caused by performing the dew condensation prevention operation during the dew condensation prevention operation time. For example, as shown in FIG. 4, when the temperature of the hoistway 1 is 15° C., the temperature of the hoisting machine 6 rises by 0.5° C. when the dew condensation prevention operation is performed for 20 seconds. Note that the relationship between the dew condensation prevention operation time and the temperature rise varies depending on the temperature of the hoistway 1. Therefore, the storage unit 25 stores the relationship between the temperature of the hoistway 1 and the corresponding dew condensation prevention operation time in a table. For example, the storage unit 25 may store a table for the temperature of the hoistway 1 in increments of 0.5° C.

[0030] When the determination unit 23 determines that the condensation prevention operation is necessary, the condensation prevention operation time acquisition unit 26 acquires the rise temperature equivalent to the required rise temperature T4 calculated by the required rise temperature calculation unit 24 and the corresponding condensation prevention operation time from the table stored in the storage unit 25. Here, the temperature of the hoistway 1 measured by the thermometer / hygrometer 18 is acquired, and the table corresponding to the acquired temperature of the hoistway 1 is referred to. For example, referring to FIG. 4 which is a table corresponding to the case where the temperature of the hoistway 1 is 15°C, it can be acquired that when the required rise temperature T4 is 0.5°C, the rise temperature equivalent to the required rise temperature T4 is 0.5°C, and the time required for the condensation prevention operation time is 20 seconds.

[0031] The hoist control unit 27 controls the operation of the hoist 6 by switching between normal operation and anti-condensation operation of the hoist 6. When the determination unit 23 determines that anti-condensation operation is necessary, the anti-condensation operation is performed. When the determination unit 23 receives the anti-condensation operation time acquired by the anti-condensation operation time acquisition unit 26, the hoist control unit 27 controls the operation of the hoist 6 so that the anti-condensation operation is performed during the anti-condensation operation time acquired by the anti-condensation operation time acquisition unit 26. When the elevator is in a standby state, the hoist control unit 27 immediately starts the anti-condensation operation, and when the elevator is not in a standby state, the hoist control unit 27 starts the anti-condensation operation after the elevator becomes in a standby state. When the anti-condensation operation is completed, the hoist control unit 27 resumes the normal operation of the hoist 6. When a hall call is registered during the anti-condensation operation, the anti-condensation operation is continued, and the hall call is responded to after the anti-condensation operation is completed.

[0032] When the determination unit 23 determines that condensation has occurred on the hoist 6, the notification unit 28 notifies an external maintenance company 29 that condensation has occurred on the hoist 6.

[0033] Here, a description will be given of the hardware configuration of elevator control panel 19 according to embodiment 1. Fig. 5 is a diagram showing the hardware configuration of elevator control panel 19 in embodiment 1. Elevator control panel 19 is realized by a computer such as a personal computer or a microcontroller.

[0034] The elevator control panel 19 includes a processor 41 , a memory 42 , an interface 43 , and a secondary storage device 44 , which are connected to each other via a bus 40 .

[0035] The processor 41 is, for example, a CPU (Central Processing Unit). The processor 41 loads an operation program stored in the secondary storage device 44 into the memory 42 and executes the program, thereby realizing each function of the elevator control panel 19.

[0036] The memory 42 is a main storage device configured by, for example, a RAM (Random Access Memory). The memory 42 stores the program read by the processor 41 from the secondary storage device 44. The memory 42 also functions as a work memory when the processor 41 executes the program.

[0037] The interface 43 is an I / O (Input / Output) interface such as a serial port, a USB (Universal Serial Bus) port, a network interface, etc. Through the interface 43, input from the thermo-hygrometer 18 and input / output from the hoist 6 are performed.

[0038] The secondary storage device 44 is, for example, a flash memory, a hard disk drive (HDD), or a solid state drive (SSD). The secondary storage device 44 stores various information necessary for the operation of the object detection system at the elevator entrance and the programs executed by the processor 41.

[0039] Next, a description will be given of the operation of the dew condensation prevention system for the elevator hoist 6 according to the embodiment 1. Fig. 6 is a flowchart showing the operation of the dew condensation prevention system for the elevator hoist 6 according to the embodiment 1.

[0040] First, the dew-point temperature calculation unit 20 acquires the temperature and relative humidity of the hoistway 1 from the thermo-hygrometer 18, and calculates the dew-point temperature T1 of the hoistway 1 using the acquired temperature and relative humidity of the hoistway 1. In addition, the hoisting machine temperature acquisition unit 22 acquires the temperature T2 of the hoisting machine 6 by calculating the temperature T2 of the hoisting machine 6 using the resistance value RT2 of the winding of the stator 15 detected by the resistance value measurement unit 21. The calculation of the dew-point temperature T1 and the calculation of the temperature T2 of the hoisting machine 6 are performed periodically, for example, once per minute (S1).

[0041] Next, the determination unit 23 determines whether or not dew prevention operation is required, using the dew point temperature T1 calculated by the dew point temperature calculation unit 20, the temperature T2 of the hoisting machine 6 detected by the resistance value measurement unit 21, and a preset threshold temperature T3. Specifically, the determination unit 23 determines whether or not the temperature T2 of the hoisting machine 6 is higher than the dew point temperature T1 (S2). If the temperature T2 of the hoisting machine 6 is higher than the dew point temperature T1, the determination unit 23 compares whether or not the temperature T2 of the hoisting machine 6 is equal to or lower than the temperature obtained by adding the threshold temperature T3 to the dew point temperature T1, and determines whether or not dew prevention operation is required (S3).

[0042] If the temperature T2 of the hoisting machine 6 is higher than the dew point temperature T1 (YES in S2) and is equal to or lower than the temperature obtained by adding the threshold temperature T3 to the dew point temperature T1, it is determined that anti-condensation operation is necessary (YES in S3). Then, the anti-condensation operation time acquisition unit 26 acquires the rise temperature equivalent to the required rise temperature T4 calculated by the required rise temperature calculation unit 24 and the corresponding anti-condensation operation time from the table in the memory unit 25. Here, the anti-condensation operation time acquisition unit 26 acquires the temperature of the hoistway 1 measured by the thermometer / hygrometer 18, and refers to a table showing the relationship between the anti-condensation operation time and the rise temperature corresponding to the acquired hoistway 1 temperature (S4).

[0043] When the hoist control unit 27 receives the condensation prevention operation time from the condensation prevention operation time acquisition unit 26, the hoist control unit 27 performs the condensation prevention operation for the condensation prevention operation time calculated by the condensation prevention operation time acquisition unit 26. As the condensation prevention operation, for example, the hoist control unit 27 applies a voltage to the motor 10 with the brake of the hoist 6 applied, and performs an operation to bring the hoist 6 to a stationary state. Note that the hoist control unit 27 immediately starts the condensation prevention operation when the elevator is in a standby state, and starts the condensation prevention operation after the elevator is in a standby state when the elevator is not in a standby state. Note that the hoist control unit 27 resumes the normal operation of the hoist 6 after the condensation prevention operation is completed. Note that, when a hall call is registered during the condensation prevention operation, the hoist control unit 27 continues the condensation prevention operation, and responds to the hall call after the condensation prevention operation is completed (S5).

[0044] When the hoisting machine 6 performs the condensation prevention operation during the condensation prevention operation time, the dew-point temperature calculation unit 20 again calculates the dew-point temperature T1, and the hoisting machine temperature acquisition unit 22 acquires the temperature T2 of the hoisting machine 6 (S1). Then, the condensation prevention operation is performed until the temperature T2 of the hoisting machine 6 becomes higher than the sum of the dew-point temperature T1 and the threshold temperature T3 (NO in S3).

[0045] If the temperature T2 of the hoisting machine 6 is greater than the dew point temperature T1 (YES in S2) and greater than the sum of the dew point temperature T1 and the threshold temperature T3, it is determined that dew prevention operation is not necessary (NO in S3), and the flow ends.

[0046] If the temperature T2 of the hoisting machine 6 is equal to or lower than the dew point temperature T1, it is determined that condensation has occurred on the hoisting machine 6 (NO in S2), and the notification unit 28 notifies an external maintenance company 29 that condensation has occurred on the hoisting machine 6 (S6).

[0047] As described above, the condensation prevention system for the elevator hoist 6 according to the first embodiment includes a dew point temperature calculation unit 20 that acquires the temperature and relative humidity of the hoistway 1 and calculates a dew point temperature T1 of the hoistway 1 from the acquired temperature and relative humidity of the hoistway 1, a hoist temperature acquisition unit 22 that acquires the temperature T2 of the hoist 6, a determination unit 23 that determines that condensation prevention operation for raising the temperature T2 of the hoist 6 is necessary if the temperature T2 of the hoist 6 acquired by the hoist temperature acquisition unit 22 is greater than the dew point temperature T1 calculated by the dew point temperature calculation unit 20 and is equal to or lower than the temperature obtained by adding a predetermined threshold temperature T3 to the dew point temperature T1, and a hoist control unit 27 that performs the condensation prevention operation if the determination unit 23 determines that the condensation prevention operation is necessary. This makes it possible to accurately determine whether or not condensation prevention operation is necessary for the hoist 6, and prevents condensation from occurring on the hoist 6.

[0048] The dew-point temperature calculation unit 20 is not limited to a means for acquiring the temperature and relative humidity of the hoistway 1. The means by which the dew-point temperature calculation unit 20 calculates the dew-point temperature T1 is not limited. The hoisting machine temperature acquisition unit 22 is not limited to a means for acquiring the temperature T2 of the hoisting machine 6. For example, the temperature T2 of the hoisting machine 6 may be acquired by a temperature sensor.

[0049] The system further includes a required rise temperature calculation unit 24 that calculates a required rise temperature T4, which is a rise temperature required for the temperature T2 of the hoisting machine 6 acquired by the hoisting machine temperature acquisition unit 22 to be higher than a temperature obtained by adding a threshold temperature T3 to the dew point temperature T1 calculated by the dew point temperature calculation unit 20; a memory unit 25 that stores a table that corresponds an anti-condensation operation time indicating a time for which the anti-condensation operation is performed to the rise temperature of the hoisting machine 6 resulting from performing the anti-condensation operation during the anti-condensation operation time; and an anti-condensation operation time acquisition unit 26 that acquires, from the table in the memory unit 25, an anti-condensation operation time corresponding to the rise temperature equivalent to the required rise temperature T4 calculated by the required rise temperature calculation unit 24, when the determination unit 23 determines that the anti-condensation operation is necessary. The hoisting machine control unit 27 performs the anti-condensation operation during the anti-condensation operation time acquired from the anti-condensation operation time acquisition unit 26, thereby being able to perform the anti-condensation operation for only the time required to raise the hoisting machine 6 to the required rise temperature T4, and thereby being able to efficiently prevent condensation from occurring on the hoisting machine 6.

[0050] In addition, although it is desirable for the hoisting machine control unit 27 to have the condensation prevention operation time acquisition unit 26 calculate the condensation prevention operation time, the condensation prevention operation may be performed for a predetermined operation time.

[0051] The means by which the required increase temperature calculation unit 24 acquires the dew-point temperature T1, the temperature T2 of the hoisting machine 6, and the threshold temperature T3 is not limited. They may be acquired from the determination unit 23, or the dew-point temperature T1 may be acquired from the dew-point temperature calculation unit 20, the temperature T2 of the hoisting machine 6 may be acquired from the hoisting machine temperature acquisition unit 22, and the threshold temperature T3 may be stored in advance.

[0052] In addition, the memory unit 25 stores in a table the relationship between the temperature of the elevator shaft 1, the corresponding anti-condensation operation time, and the rise temperature, and the anti-condensation operation time acquisition unit 26 acquires the temperature of the elevator shaft 1 and acquires the rise temperature equivalent to the required rise temperature T4 calculated by the required rise temperature calculation unit 24 and the corresponding anti-condensation operation time from the table corresponding to the temperature of the elevator shaft 1, thereby accurately determining the time required to raise the hoisting machine 6 to the required rise temperature T4.

[0053] The means by which the dew condensation prevention operation time acquisition unit 26 acquires the temperature of the hoistway 1 is not limited.

[0054] Furthermore, if the elevator is not in a standby state, the hoisting machine control unit 27 starts the condensation prevention operation after the elevator is in a standby state. Furthermore, the hoisting machine control unit 27 resumes normal operation of the hoisting machine 6 after the condensation prevention operation ends. Furthermore, if a hall call is registered during the condensation prevention operation, the hoisting machine control unit 27 continues the condensation prevention operation, and responds to the hall call after the condensation prevention operation ends. By having the hoisting machine control unit 27 operate the hoisting machine 6 in this manner, it is possible to prioritize the condensation prevention operation while maintaining smooth operation of the elevator, and to prevent condensation from occurring on the hoisting machine 6.

[0055] In addition, the dew point temperature calculation unit 20 obtains the temperature and relative humidity of the elevator shaft 1 from a thermometer / hygrometer 18 provided on the elevator shaft 1 side surface of the wall forming the entrance / exit of the hall 2, thereby being able to accurately obtain the dew point temperature of the elevator shaft 1, which changes due to the air flowing into the elevator shaft 1 from the entrance / exit of the hall 2.

[0056] It is preferable that the thermo-hygrometer 18 is provided on the surface of the wall forming the entrance / exit of the hall 2, facing the hoistway 1, but there are no limitations on where it is provided as long as it is in the hoistway 1.

[0057] Moreover, the hoisting machine temperature acquisition unit 22 calculates the temperature of the windings of the stator 15 of the hoisting machine 6, thereby acquiring the temperature T2 of the hoisting machine 6, thereby making it possible to prevent condensation from occurring on the stator 15 of the hoisting machine 6. Moreover, the hoisting machine temperature acquisition unit 22 acquires the measurement result of the resistance value RT2 of the windings of the stator 15 of the hoisting machine 6 and calculates the temperature of the windings of the stator 15 of the hoisting machine 6 using the resistance value RT2, thereby making it possible to calculate and acquire the temperature of the windings of the stator 15 of the hoisting machine 6 without using any components for acquiring the temperature of the windings of the stator 15 of the hoisting machine 6.

[0058] In addition, there are no limitations on the presence or absence of a machine room of the elevator and on the roping method. If the hoisting machine 6 is in the machine room, the machine room, not the hoistway 1, is adjacent to the hoisting machine 6, so the thermometer / hygrometer 18 may be provided in the machine room.

[0059] The dew condensation prevention operation is not limited as long as it is an operation that increases the amount of heat generated by the hoisting machine 6 and raises the temperature of the hoisting machine 6. For example, the hoisting machine 6 may be operated at a slower speed than normal with the brake of the hoisting machine 6 applied. For example, the hoisting machine 6 may be operated so as to repeatedly raise and lower the car 3 in the hoistway 1.

[0060] It should be noted that the functions of the dew point temperature calculation unit 20, the resistance value measurement unit 21, the hoisting machine temperature acquisition unit 22, the determination unit 23, the memory unit 25, the condensation prevention operation time acquisition unit 26, the hoisting machine control unit 27, and the notification unit 28 are realized by the elevator control panel 19 provided in the elevator, but are not limited to this. For example, some or all of the functions may be realized by a computer different from the elevator control panel 19, or an elevator control server.

[0061] In addition, air may flow in from the entrance / exit of the landing 2, causing the dew point temperature of the hoistway 1 to rise rapidly. In this case, the dew point temperature of the hoistway 1 may become higher than the temperature of the hoistway 6 before it is determined whether or not dew prevention operation is required, and dew condensation may occur on the hoistway 6. In preparation for this case, a dew condensation detection sensor may be provided on the hoistway 6. The dew condensation detection sensor is, for example, a sensor that calculates the dew point temperature around the dew condensation detection sensor and compares the calculated dew point temperature with the surface temperature of the dew condensation detection sensor. In addition, when the dew condensation detection sensor detects dew condensation, the notification unit 28 may notify an external maintenance company 29 that dew condensation has occurred on the hoistway 6.

[0062] Furthermore, if the condensation detection sensor detects condensation, an impulse test may be performed to check the insulation performance of the stator 15. In the impulse test, an impulse voltage is applied to the stator 15. If a partial discharge is detected from a signal responding to the impulse test, deterioration of the insulating material or insulation failure can be detected, and it is found that an abnormality has occurred in the stator 15. If a partial discharge is detected from a signal responding to the impulse test, an external maintenance company may be notified of the abnormality in the stator 15.

[0063] Furthermore, a water ingress detection sensor may be provided under the hoisting machine 6 to check whether the hoisting machine 6 is submerged in water. The water ingress detection sensor detects a change in the conductivity of the surface of the water ingress detection sensor, for example, due to the formation of water droplets on the surface of the water ingress detection sensor. When the water ingress detection sensor detects the submersion of the hoisting machine 6, a ground fault may occur, so the power supply to the stator 15 may be stopped and the notification unit 28 may notify an external maintenance company 29 of an abnormality in the hoisting machine 6.

[0064] The configurations shown in the above embodiments are merely examples of the contents of the present disclosure, and may be combined with other known techniques. Furthermore, parts of the configurations may be omitted or modified without departing from the scope of the present disclosure.

[0065] Various aspects of the present disclosure are summarized below as appendices. (Appendix 1) a dew point temperature calculation unit that acquires a temperature and a relative humidity of a hoistway and calculates a dew point temperature of the hoistway from the acquired temperature and relative humidity of the hoistway; A hoisting machine temperature acquisition unit that acquires the temperature of the hoisting machine; a determination unit that determines that a dew prevention operation for increasing the temperature of the hoisting machine is necessary when the temperature of the hoisting machine acquired by the hoisting machine temperature acquisition unit is higher than the dew point temperature calculated by the dew point temperature calculation unit and is equal to or lower than a temperature obtained by adding a predetermined threshold temperature to the dew point temperature; and A hoist control unit that performs the condensation prevention operation when the determination unit determines that the condensation prevention operation is necessary; An elevator hoisting machine condensation prevention system comprising: (Appendix 2) a required rise temperature calculation unit that calculates a required rise temperature, which is a rise temperature required for the temperature of the hoist acquired by the hoist temperature acquisition unit to be higher than a temperature obtained by adding the dew point temperature calculated by the dew point temperature calculation unit to the threshold temperature; and a storage unit that stores a table that associates a dew condensation prevention operation time indicating a time for which the dew condensation prevention operation is performed with an increase in temperature of the hoist caused by performing the dew condensation prevention operation during the dew condensation prevention operation time; a dew condensation prevention operation time acquisition unit that acquires, when the determination unit determines that the dew condensation prevention operation is necessary, the dew condensation prevention operation time corresponding to the rise temperature equivalent to the necessary rise temperature calculated by the necessary rise temperature calculation unit from the table in the storage unit; Equipped with The hoist control unit performs the condensation prevention operation for the condensation prevention operation time acquired from the condensation prevention operation time acquisition unit. 10. A condensation prevention system for an elevator hoist as described in claim 1. (Appendix 3) The storage unit stores in the table a relationship between the temperature of the elevator shaft, a corresponding condensation prevention operation time, and an increase in temperature; The dew condensation prevention operation time acquisition unit acquires the temperature of the elevator shaft, and acquires the dew condensation prevention operation time corresponding to the rise temperature equivalent to the required rise temperature calculated by the required rise temperature calculation unit from the table corresponding to the temperature of the elevator shaft. 1. A condensation prevention system for an elevator hoist as described in appendix 2. (Appendix 4) When the elevator is not in a standby state, the hoist control unit starts the condensation prevention operation after the elevator becomes in a standby state. A condensation prevention system for an elevator hoisting machine according to any one of appendix 1 to 3. (Appendix 5) The hoist control unit resumes normal operation of the hoist after the condensation prevention operation is completed. A condensation prevention system for an elevator hoisting machine according to any one of appendix 1 to 4. (Appendix 6) When a hall call is registered during the dew condensation prevention operation, the hoist control unit continues the dew condensation prevention operation and responds to the hall call after the dew condensation prevention operation is completed. 6. A condensation prevention system for an elevator hoist as described in appendix 5. (Appendix 7) The dew point temperature calculation unit acquires the temperature and relative humidity of the elevator shaft from a thermometer and hygrometer provided on a surface of a wall forming an entrance of a landing on the elevator shaft side. A condensation prevention system for an elevator hoisting machine according to any one of appendixes 1 to 6. (Appendix 8) The hoisting machine temperature acquisition unit acquires the temperature of the hoisting machine by calculating a temperature of a winding of a stator of the hoisting machine. 8. A condensation prevention system for an elevator hoist according to claims 1 to 7. (Appendix 9) The hoist temperature acquisition unit acquires a measurement result of a resistance value of the stator winding of the hoist machine and calculates a temperature of the stator winding of the hoist machine using the resistance value. 9. A condensation prevention system for an elevator hoist as described in appendix 8. (Appendix 10) a dew-point temperature calculation step of acquiring a temperature and a relative humidity of a hoistway, and calculating a dew-point temperature of the hoistway from the acquired temperature and relative humidity of the hoistway by a dew-point temperature calculation unit; A hoisting machine temperature acquisition step in which a hoisting machine temperature acquisition unit acquires the temperature of the hoisting machine; a determination step in which a determination unit determines that a dew prevention operation for increasing the temperature of the hoisting machine is necessary when the temperature of the hoisting machine acquired by the hoisting machine temperature acquisition unit is higher than the dew point temperature calculated by the dew point temperature calculation unit and is equal to or lower than a temperature obtained by adding a predetermined threshold temperature to the dew point temperature; a hoist control step in which, when the determination unit determines that the condensation prevention operation is necessary, a hoist control unit performs the condensation prevention operation; A method for preventing condensation in an elevator hoisting machine comprising: [Explanation of symbols]

[0066] 1 elevator shaft, 2 landing, 3 cage, 4 counterweight, 5 rope, 6 hoist, 7 cage door, 8 landing door, 9 sheave, 10 motor, 11 shaft, 12 bearing, 13 control device, 14 foundation member, 15 stator, 16 rotor, 17 casing, 18 thermometer / hygrometer, 19 elevator control panel, 20 dew point temperature calculation unit, 21 resistance value measurement unit, 22 hoist temperature acquisition unit, 23 judgment unit, 24 required rise temperature calculation unit, 25 memory unit, 26 condensation prevention operation time acquisition unit, 27 hoist control unit, 28 notification unit, 29 maintenance company, 40 bus, 41 processor, 42 memory, 43 interface, 44 secondary storage device

Claims

1. a dew point temperature calculation unit that acquires a temperature and a relative humidity of a hoistway and calculates a dew point temperature of the hoistway from the acquired temperature and relative humidity of the hoistway; A hoisting machine temperature acquisition unit that acquires the temperature of the hoisting machine; a determination unit that determines that a dew prevention operation for increasing the temperature of the hoisting machine is necessary when the temperature of the hoisting machine acquired by the hoisting machine temperature acquisition unit is higher than the dew point temperature calculated by the dew point temperature calculation unit and is equal to or lower than a temperature obtained by adding a predetermined threshold temperature to the dew point temperature; and A hoist control unit that performs the condensation prevention operation when the determination unit determines that the condensation prevention operation is necessary; An elevator hoisting machine condensation prevention system comprising:

2. a required rise temperature calculation unit that calculates a required rise temperature, which is a rise temperature required for the temperature of the hoist acquired by the hoist temperature acquisition unit to be higher than a temperature obtained by adding the dew point temperature calculated by the dew point temperature calculation unit to the threshold temperature; and a storage unit that stores a table that associates a dew condensation prevention operation time indicating a time for which the dew condensation prevention operation is performed with an increase in temperature of the hoist caused by performing the dew condensation prevention operation during the dew condensation prevention operation time; a dew condensation prevention operation time acquisition unit that acquires, when the determination unit determines that the dew condensation prevention operation is necessary, the dew condensation prevention operation time corresponding to the rise temperature equivalent to the necessary rise temperature calculated by the necessary rise temperature calculation unit from the table in the storage unit; Equipped with The hoist control unit performs the condensation prevention operation for the condensation prevention operation time acquired from the condensation prevention operation time acquisition unit. The condensation prevention system for an elevator hoist according to claim 1.

3. The storage unit stores in the table a relationship between the temperature of the elevator shaft and the corresponding condensation prevention operation time and an increase in temperature, The dew condensation prevention operation time acquisition unit acquires the temperature of the elevator shaft, and acquires the dew condensation prevention operation time corresponding to the rise temperature equivalent to the required rise temperature calculated by the required rise temperature calculation unit from the table corresponding to the temperature of the elevator shaft. The condensation prevention system for an elevator hoist according to claim 2.

4. When the elevator is not in a standby state, the hoist control unit starts the condensation prevention operation after the elevator becomes in a standby state. The condensation prevention system for an elevator hoist according to any one of claims 1 to 3.

5. The hoist control unit resumes normal operation of the hoist after the condensation prevention operation is completed. The condensation prevention system for an elevator hoist according to any one of claims 1 to 3.

6. When a hall call is registered during the dew condensation prevention operation, the hoist control unit continues the dew condensation prevention operation and responds to the hall call after the dew condensation prevention operation is completed. The condensation prevention system for an elevator hoist according to claim 5.

7. The dew point temperature calculation unit acquires the temperature and relative humidity of the elevator shaft from a thermometer and hygrometer provided on a surface of a wall forming an entrance of a landing on the elevator shaft side. The condensation prevention system for an elevator hoist according to any one of claims 1 to 3.

8. The hoisting machine temperature acquisition unit acquires the temperature of the hoisting machine by calculating a temperature of a winding of a stator of the hoisting machine. The condensation prevention system for an elevator hoist according to any one of claims 1 to 3.

9. The hoist temperature acquisition unit acquires a measurement result of a resistance value of the stator winding of the hoist machine and calculates a temperature of the stator winding of the hoist machine using the resistance value. The condensation prevention system for an elevator hoist according to claim 8.

10. a dew-point temperature calculation step of acquiring a temperature and a relative humidity of a hoistway, and calculating a dew-point temperature of the hoistway from the acquired temperature and relative humidity of the hoistway by a dew-point temperature calculation unit; a hoisting machine temperature acquisition step in which a hoisting machine temperature acquisition unit acquires the temperature of the hoisting machine; a determination step in which a determination unit determines that a dew prevention operation for increasing the temperature of the hoisting machine is necessary when the temperature of the hoisting machine acquired by the hoisting machine temperature acquisition unit is higher than the dew point temperature calculated by the dew point temperature calculation unit and is equal to or lower than a temperature obtained by adding a predetermined threshold temperature to the dew point temperature; a hoist control step in which, when the determination unit determines that the condensation prevention operation is necessary, a hoist control unit performs the condensation prevention operation; A method for preventing condensation in an elevator hoisting machine comprising:

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