Elevator hoisting machine and dustproof device for elevator hoisting machine

Abstract

The present invention provides an elevator hoisting machine and a dustproof device for an elevator hoisting machine that can suppress the amount of dust flowing into the motor with a simple configuration and more reliably ensure the cooling function inside the motor. [Solution] In the elevator hoisting machine, a first cover 61 having a first dust filter 612 covers a cooling air intake 511 formed on the motor 5. A second cover 62 having a second dust filter 622 is detachably attached to the motor 5 and positioned on the opposite side of the first cover 61 from the cooling air intake 511 side. The blower 7 generates cooling air from the airflow that flows inside the motor 5, passing sequentially from the outside of the motor 5 through the dust protection device 6 and the cooling air intake 511. The cooling air generated by the operation of the blower 7 passes sequentially through the second dust filter 622 and the first dust filter 612 in the dust protection device 6.

Description

Technical Field

[0001] The present disclosure relates to an elevator hoist and a dust-proof device for an elevator hoist.

Background Art

[0002] During the construction of a building, an elevator hoist may be used to transport materials and the like. When the elevator hoist is operated, the cooling air generated by the rotation of the fan flows through the inside of the motor, thereby cooling the inside of the motor. Therefore, when the elevator hoist is operated during the construction of a building, cooling air containing a large amount of dust flows into the inside of the motor, and the motor is likely to malfunction.

[0003] In Patent Document 1, in order to suppress the amount of dust flowing into the inside of the motor, an annular duct is formed between an external cover and an internal cover, and a part of the cooling air flowing through the annular duct is caused to flow into the inside of the motor. An elevator hoist is disclosed. An exhaust duct is formed at the lower end of the annular duct. Among the cooling air flowing through the annular duct, the air containing a large amount of dust does not flow into the inside of the motor due to the inertia caused by the flow of the cooling air, but flows into the exhaust duct. Thereby, the amount of dust flowing into the inside of the motor is suppressed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the conventional elevator hoisting machine disclosed in Patent Document 1, in order to suppress the amount of dust flowing into the motor, it is necessary not only to form an annular duct between the outer cover and the inner cover, but also to form an exhaust duct at the lower end of the annular duct. As a result, the structure for suppressing the amount of dust flowing into the motor becomes complex.

[0006] Furthermore, in the conventional elevator hoisting machine disclosed in Patent Document 1, only a portion of the cooling air flowing through the annular duct flows inside the motor. As a result, the amount of cooling air flowing inside the motor is reduced. Consequently, during normal elevator operation, when the motor output is higher than during building construction, it becomes difficult to ensure adequate cooling for the inside of the motor.

[0007] This disclosure aims to solve the above-mentioned problems and to provide an elevator hoisting machine and a dustproof device for an elevator hoisting machine that can suppress the amount of dust flowing into the motor with a simple configuration and more reliably ensure the cooling function inside the motor. [Means for solving the problem]

[0008] The elevator hoisting machine according to this disclosure comprises a drive sheave, a motor having a cooling air intake and generating a driving force to rotate the drive sheave, a dustproof device attached to the motor covering the cooling air intake, and a blower that generates cooling air as airflow flowing inside the motor, passing sequentially through the dustproof device and the cooling air intake from outside the motor. The dustproof device has a first cover covering the cooling air intake and a second cover that is detachably attached to the motor and positioned on the opposite side of the first cover from the cooling air intake. The first cover has a first dustproof filter, and the second cover has a second dustproof filter. The cooling air generated by the operation of the blower passes sequentially through the second dustproof filter and the first dustproof filter in the dustproof device. Furthermore, the dustproof device for an elevator hoisting machine according to this disclosure comprises a first cover that covers a cooling air intake formed in a motor that generates a driving force to rotate a drive sheave, and a second cover that is detachably attached to the motor and positioned on the opposite side of the first cover from the cooling air intake side. The first cover has a first dustproof filter, and the second cover has a second dustproof filter. When the first and second covers are attached to the motor, the cooling air generated by the operation of the blower flows from outside the motor, sequentially passing through the second dustproof filter, the first dustproof filter, and the cooling air intake, and then into the inside of the motor. [Effects of the Invention]

[0009] According to the elevator hoisting machine and dustproof device for the elevator hoisting machine described herein, the amount of dust flowing into the motor can be suppressed with a simple configuration, and the cooling function for the inside of the motor can be more reliably ensured. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic partially broken cross-sectional view showing an elevator hoisting machine according to Embodiment 1. [Figure 2] Figure 1 is a schematic side view showing the elevator hoisting machine. [Figure 3] Figure 1 is an enlarged view showing the cover mounting section attached to the motor case by mounting screws. [Figure 4] This is a partial cross-sectional view showing the path of the cooling air generated by the operation of the blower in Figure 1 as it flows inside the motor. [Figure 5] This is a schematic, partially broken cross-sectional view of the elevator hoisting machine when the second cover of Figure 1 is removed from the motor. [Figure 6] Figure 5 is a schematic side view of the elevator hoisting machine. [Figure 7] Figure 5 is a partial cross-sectional view showing the path of the cooling air generated by the operation of the blower as it flows inside the motor. [Figure 8]This is a partial cross-sectional view showing the path of cooling air generated by the operation of a blower when it flows inside the motor in an elevator hoisting machine according to Embodiment 2. [Figure 9] This is an enlarged view showing the second cover of Figure 8 attached to the first cover by a mounting bracket. [Modes for carrying out the invention]

[0011] The embodiments for carrying out the subject matter of this disclosure will be described with reference to the attached figures. In each figure, the same or corresponding parts are denoted by the same reference numerals, and redundant explanations are simplified or omitted as appropriate. The subject matter of this disclosure is not limited to the following embodiments, and any modification of any component of the embodiments or omission of any component of the embodiments is possible without departing from the spirit of this disclosure.

[0012] Embodiment 1. During construction of a building in which an elevator is installed, the elevator hoisting machine according to Embodiment 1 is used to transport construction materials and other construction-related items. The elevator hoisting machine is installed in a machine room located at the top of the hoistway in the building. During construction of the building, the elevator hoisting machine moves a lifting rope, which suspends the construction materials within the hoistway, in an up-and-down direction, thereby transporting the construction materials vertically.

[0013] After an elevator is installed in a building, the elevator hoisting machine used during the building's construction is used as the elevator's drive system. In an elevator, the elevator rope, which suspends the car and counterweight within the hoistway, is wound around the elevator hoisting machine. During normal elevator operation, the elevator rope moves due to the driving force of the elevator hoisting machine, causing the car and counterweight to move vertically within the hoistway.

[0014] FIG. 1 is a partially broken cross-sectional view schematically showing an elevator hoisting machine according to Embodiment 1. Further, FIG. 2 is a side view schematically showing the elevator hoisting machine of FIG. 1. FIGS. 1 and 2 show the state of the elevator hoisting machine when transporting construction materials during the construction of a building. In the figures, the elevator hoisting machine has a support base 1, a main shaft 2, a drive sheave 3, and a hoisting machine body 4. The main shaft 2, the drive sheave 3, and the hoisting machine body 4 are supported by the support base 1.

[0015] The support base 1 has a base 11, a first support portion 12, and a second support portion 13. The base 11 is horizontally disposed in the machine room. The first support portion 12 and the second support portion 13 are fixed to the upper surface of the base 11.

[0016] The main shaft 2 is attached to the first support portion 12 and the second support portion 13 above the base 11. The main shaft 2 is horizontally disposed. The first support portion 12 and the second support portion 13 are disposed at positions separated from each other in the direction along the axis of the main shaft 2.

[0017] A through hole 14 through which the main shaft 2 passes is formed in each of the first support portion 12 and the second support portion 13. In each of the first support portion 12 and the second support portion 13, a bearing 15 is fitted between the inner peripheral surface of the through hole 14 and the outer peripheral surface of the main shaft 2. Thereby, the main shaft 2 is rotatably supported by each of the first support portion 12 and the second support portion 13 via the bearing 15.

[0018] The drive sheave 3 is fixed to the main shaft 2. Thereby, the drive sheave 3 rotates integrally with the main shaft 2 with respect to the support base 1. The drive sheave 3 is disposed in the space between the first support portion 12 and the second support portion 13.

[0019] A plurality of rope grooves (not shown) are respectively formed along the circumferential direction of the drive sheave 3 on the outer peripheral portion of the drive sheave 3. During the construction of a building, a hoisting rope for suspending construction materials such as materials is wound around the drive sheave 3. The hoisting rope for suspending construction materials is inserted into any one of the plurality of rope grooves.

[0020] The hoisting machine body 4 is supported by the first support section 12. The hoisting machine body 4 is positioned on the opposite side from the drive sheave 3 side when viewed from the first support section 12 in the axial direction of the main shaft 2. The hoisting machine body 4 includes a motor 5, a dustproof device 6, and a blower 7.

[0021] Motor 5 generates the driving force to rotate the main spindle 2 and the drive sheave 3. Motor 5 has a motor case 51, a stator 52, and a rotor 53.

[0022] The motor case 51 has a cylindrical shape. The motor case 51 is positioned around the axis of the main shaft 2. One end of the motor case 51 is fixed to the first support part 12. An opening is formed at the other end of the motor case 51 as a cooling air intake 511.

[0023] The stator 52 is located inside the motor case 51. The stator 52 is cylindrical in shape. The stator 52 is positioned coaxially with the main shaft 2. One end of the stator 52 is fixed to the first support portion 12. An opening is formed at the other end of the stator 52. In this embodiment, a gap is formed between the outer circumferential surface of the stator 52 and the inner circumferential surface of the motor case 51.

[0024] The stator 52 has a stator core and stator windings. The stator core is cylindrical in shape. The stator core is fixed to the first support portion 12. The stator core is arranged coaxially with the main shaft 12. The stator core is a laminated core in which multiple magnetic plates are stacked in the axial direction of the main shaft 2. The stator windings are provided on the stator core. The stator windings can be powered from an external power source (not shown).

[0025] The rotor 53 is located inside the stator 52. The rotor 53 is fixed to the spindle 2. As a result, the rotor 53 rotates integrally with the spindle 2. The rotor 53 has a cylindrical shape. The rotor 53 is positioned coaxially with the spindle 2. A gap is formed between the outer surface of the rotor 53 and the inner surface of the stator 52.

[0026] The rotor 53 has a rotor core and multiple permanent magnets. The rotor core is fixed to the main shaft 2. The multiple permanent magnets are provided on the rotor core. As a result, multiple magnetic poles are formed on the rotor 53.

[0027] A rotating magnetic field is generated in the stator 52 by supplying power to the stator windings. When a rotating magnetic field is generated in the stator 52, the rotor 53 rotates integrally with the spindle 2 relative to the support base 1, about the axis of the spindle 2. As a result, the motor 5 generates a driving force that rotates the spindle 2 and the drive sheave 3 by supplying power to the stator windings. When the rope suspending the construction material is wrapped around the drive sheave 3, the rotation of the drive sheave 3 causes the construction material to move up and down in accordance with the rotation of the drive sheave 3.

[0028] The dustproof device 6 is attached to the motor 5 as a dustproof device for the elevator hoisting machine, covering the cooling air intake 511. The dustproof device 6 removes dust from the air by capturing dust mixed in the air passing through it.

[0029] The blower 7 is attached to the motor case 51. The blower 7 is positioned outside the motor 5, covering a ventilation opening, which is a through-hole (not shown) formed in the outer wall of the motor case 51. The ventilation opening is formed in the motor case 51 adjacent to the first support portion 12.

[0030] The blower 7 has a fan (not shown) and a fan motor (not shown). The fan motor generates a driving force to rotate the fan when power is supplied to it. By rotating the fan, the blower 7 generates a cooling airflow to cool the inside of the motor 5. The cooling airflow is an airflow that flows from outside the motor 5, sequentially passing through the dustproof device 6 and the cooling air intake port 511, then flows inside the motor 5, and is discharged to the outside of the motor 5 through the vent port. In the hoisting machine body 4, the motor 5 is cooled by the cooling air flowing inside it, thereby preventing the motor 5 from failing due to temperature rise.

[0031] The air surrounding the motor 5 contains dust. Therefore, when the blower 7 generates cooling air, there is a risk that dust will flow into the motor 5 along with the cooling air. If the amount of dust flowing into the motor 5 increases and exceeds the motor 5's capacity, the motor 5 may fail due to the dust. The dustproof device 6 captures the dust mixed in the cooling air passing through it and removes the dust from the cooling air. This suppresses the amount of dust flowing into the motor 5.

[0032] The dustproof device 6 has a first cover 61 and a second cover 62.

[0033] The first cover 61 is attached to the motor case 51 while covering the cooling air intake 511. The first cover 61 is attached to the motor case 51 by welding, screws, etc. The first cover 61 has a first cover body member 611 and a first dust filter 612.

[0034] The first cover body member 611 is a plate-shaped member. The outer shape of the first cover body member 611 is shaped to match the shape of the cooling air intake port 511. In this embodiment, the outer shape of the first cover body member 611 is circular. The outer periphery of the first cover body member 611 is attached to the motor case 51. The first cover body member 611 is provided with a plurality of first openings 613.

[0035] The first dust filter 612 is positioned in each of the multiple first openings 613. The first dust filter 612 is attached to the first cover body member 611. The first dust filter 612 is made of a material through which air can pass. For example, fibers are used as the material for the first dust filter 612. The first dust filter 612 filters out dust mixed in the air as it passes through it, thereby capturing the dust.

[0036] In the first cover 61, for example, the first dust filter 612 may be attached to the first cover body member 611 by attaching a retaining plate to the first cover body member 611 and pressing a part of the first dust filter 612 against the first cover body member 611 with the retaining plate. Alternatively, in the first cover 61, the first dust filter 612 may be attached to the first cover body member 611 by, for example, placing the first dust filter 612 in the first opening 613 and sandwiching the first cover body member 611 with a pair of wire mesh.

[0037] The second cover 62 is attached to the motor 5 in a position opposite to the cooling air intake 511 side of the first cover 61. As a result, the second cover 62 is positioned upstream of the first cover 61 in the cooling air generated by the operation of the blower 7.

[0038] In this embodiment, the second cover 62 is attached to the motor case 51 by mounting screws 63, which serve as mounting fixtures. As a result, the second cover 62 can be removed from the motor case 51 by removing the mounting screws 63 from the motor case 51. In other words, the second cover 62 is detachably attached to the motor 5.

[0039] The second cover 62 comprises a second cover body member 621 and a second dust filter 622.

[0040] The outer circumference of the second cover body member 621 is a cylindrical cover mounting portion 621a. As a result, the outer circumference of the second cover 62 is also a cover mounting portion 621a. When the second cover 62 is attached to the motor case 51, the inner surface of the cover mounting portion 621a fits onto the outer surface of the motor case 51, with the first cover 61 positioned inside the cover mounting portion 621a. As a result, the cover mounting portion 621a overlaps the outer surface of the motor case 51, avoiding the first cover 61. The second cover 62 is attached to the motor case 51 by attaching the cover mounting portion 621a to the motor case 51 with mounting screws 63.

[0041] Here, Figure 3 is an enlarged view showing the state in which the cover mounting portion 621a of Figure 1 is attached to the motor case 51 by mounting screws 63. The cover mounting portion 621a has a through hole 621b through which the threaded portion of the mounting screw 63 passes. The through hole 621b is a through hole that penetrates the cover mounting portion 621a. The cover mounting portion 621a is fastened to the motor case 51 by screwing the threaded portion of the mounting screw 63, which has passed through the through hole 621b, into the screw hole of the motor case 51. In this way, the cover mounting portion 621a is attached to the motor case 51.

[0042] As shown in Figure 1, the second cover body member 621 is provided with a plurality of second openings 623. The position of each second opening 623 is determined to match the position of each first opening 613. The size of each second opening 623 is larger than the size of each first opening 613. As a result, when the dustproof device 6 is viewed along the axial direction of the main shaft 2, the area of ​​each first opening 613 is contained within the area of ​​each second opening 623.

[0043] The second dust filter 622 is positioned in each of the multiple second openings 623. The second dust filter 622 is attached to the second cover body member 621. The second dust filter 622 is made of a material through which air can pass. For example, fibers are used as the material for the second dust filter 622. The second dust filter 622 filters out dust mixed in the air as it passes through it, thereby capturing the dust.

[0044] In the second cover 62, for example, the second dust filter 622 may be attached to the second cover body member 621 by attaching a retaining plate to the second cover body member 621 and pressing a part of the second dust filter 622 against the second cover body member 621 with the retaining plate. Alternatively, in the second cover 62, the second dust filter 622 may be attached to the second cover body member 621 by, for example, placing the second dust filter 622 in the second opening 623 and sandwiching the second cover body member 621 with a pair of wire mesh.

[0045] The mesh size of the second dust filter 622 is finer than that of the first dust filter 612. This allows the second dust filter 622 to capture dust particles smaller than those captured by the first dust filter 612. On the other hand, the first dust filter 612 allows cooling air to pass through more easily than the second dust filter 622.

[0046] Figure 4 is a partial cross-sectional view showing the path of the cooling air generated by the operation of the blower 7 in Figure 1 as it flows inside the motor 5. The cooling air generated by the operation of the blower 7 flows into the inside of the motor 5 from the outside of the motor 5, passing sequentially through the second dust filter 622, the first dust filter 612, and the cooling air intake port 511, as shown by arrow A. At this time, dust mixed in the cooling air is captured by the second dust filter 622 and the first dust filter 612, respectively. This suppresses the amount of dust that flows into the inside of the motor 5.

[0047] After this, the cooling air flows through the gaps between the motor case 51 and the stator 52, and between the stator 52 and the rotor 53, towards the first support section 12. At this time, the stator 52 and the rotor 53 are cooled by the cooling air. After this, the cooling air is discharged from the vents of the motor 5 through the blower 7 to the outside of the motor 5.

[0048] During construction of a building, the amount of dust mixed in the air around the motor 5 increases. Therefore, during construction, the amount of dust that flows into the motor 5 along with the cooling air generated by the operation of the blower 7 may exceed the motor 5's capacity.

[0049] During construction of a building, the first cover 61 and the second cover 62 of the dust control device 6 are attached to the motor 5, and construction materials are transported by the elevator hoisting machine. As a result, dust mixed in the cooling air is removed by the first cover 61 and the second cover 62, respectively, and the amount of dust flowing into the motor 5 is more reliably suppressed.

[0050] Furthermore, during construction, construction materials are transported at a low speed, which reduces the output of the elevator hoisting machine's motor 5. As a result, the internal temperature of the motor 5 does not rise easily during construction. Therefore, even if the amount of cooling air flowing inside the motor 5 is limited by the resistance of the first cover 61 and the second cover 62 during construction, the cooling function for the stator 52 and rotor 53 is ensured.

[0051] Next, we will describe the elevator hoisting machine during normal elevator operation. After the construction of the building is completed and the elevator is installed in the building, the elevator is operated under normal conditions. During normal elevator operation, the elevator hoisting machine is operated with the second cover 62 removed from the motor 5.

[0052] Figure 5 is a schematic partially cutaway cross-sectional view showing the elevator hoisting machine when the second cover 62 of Figure 1 is removed from the motor 5. Figure 6 is a schematic side view showing the elevator hoisting machine of Figure 5. The second cover 62 is removed from the motor 5 by removing the mounting screws 63 from the motor case 51. Therefore, during normal elevator operation, only the first cover 61 of the two covers 62 is attached to the motor case 51. The mounting screws 63 are screwed into the screw holes of the motor case 51 from which the second cover 62 has been removed. As a result, during normal elevator operation, the screw holes of the motor case 51 are blocked by the mounting screws 63.

[0053] Figure 7 is a partial cross-sectional view showing the path of the cooling air generated by the operation of the blower 7 in Figure 5 as it flows inside the motor 5. The cooling air generated by the operation of the blower 7 flows into the motor 5 from the outside of the motor 5, passing sequentially through the first dust filter 612 and the cooling air intake port 511, as shown by arrow A. At this time, dust mixed in the cooling air is captured by the first dust filter 612. Also, at this time, the screw holes of the motor case 51 are blocked by the mounting screws 63, so that the cooling air does not flow into the motor 5 from the outside of the motor 5 through the screw holes of the motor case 51. This suppresses the amount of dust that flows into the motor 5. The path of the cooling air after this is the same as when the second cover 62 is attached to the motor 5. As a result, the stator 52 and rotor 53 are cooled by the cooling air, and a cooling function is ensured for the stator 52 and rotor 53, respectively.

[0054] During normal elevator operation, the amount of dust mixed in the air around the motor 5 is less than during construction of the building. Therefore, during normal elevator operation, even if the second cover 62 is not attached to the motor 5, the amount of dust flowing into the motor 5 is sufficiently suppressed by the first dust filter 612.

[0055] Furthermore, during normal elevator operation, the output of the elevator hoisting machine motor 5 is higher than the output of the elevator hoisting machine motor 5 during construction of the building. As a result, the internal temperature of the motor 5 tends to rise during normal elevator operation. However, during normal elevator operation, the second cover 62 is removed from the motor 5, allowing cooling air to flow into the motor 5 more easily than during construction, and the amount of cooling air flowing inside the motor 5 is greater than during construction. Therefore, even during normal elevator operation, when the internal temperature of the motor 5 tends to rise, sufficient cooling function by cooling air is ensured for both the stator 52 and the rotor 53.

[0056] In this type of elevator hoisting machine, the dustproof device 6 has a first cover 61 and a second cover 62. The first cover 61 covers the cooling air intake 511 formed in the motor 5. The second cover 62 is detachably attached to the motor 5 and positioned on the opposite side of the first cover 61 from the cooling air intake 511 side. The first cover 61 has a first dust filter 612. The second cover 62 has a second dust filter 622. The blower 7 generates cooling air by sequentially passing airflow from outside the motor 5 through the dustproof device 6 and the cooling air intake 511 and flowing inside the motor 5. The cooling air generated by the operation of the blower 7 sequentially passes through the second dust filter 622 and the first dust filter 612 in the dustproof device 6.

[0057] Therefore, by simply attaching the first cover 61 and the second cover 62 to the motor 5, dust mixed in the cooling air flowing into the motor 5 can be removed from the cooling air by the second dust filter 622 and the first dust filter 612, respectively. This ensures that even when a large amount of dust is mixed in the air around the motor 5 during construction, dust flowing into the motor 5 can be removed more reliably. Furthermore, the cooling air that has passed through the second dust filter 622 and the first dust filter 612 can be made to flow inside the motor 5. Thus, during construction, the amount of dust flowing into the motor 5 can be suppressed with a simple configuration, and the cooling function inside the motor 5 can be more reliably ensured.

[0058] Furthermore, during normal elevator operation, the amount of dust mixed in the air around the motor 5 is less than during construction of the building. Therefore, even if the second cover 62 is removed from the motor 5, the first dust filter 612 removes dust from the cooling air, preventing the amount of dust from exceeding the motor 5's capacity. This allows the amount of dust flowing into the motor 5 to be suppressed with a simple configuration, even during normal elevator operation. Also, when the second cover 62 is removed from the motor 5, the amount of cooling air flowing into the motor 5 increases. This allows the amount of cooling air flowing inside the motor 5 to be increased while suppressing the amount of dust flowing into the motor 5 during normal elevator operation. Consequently, even during normal elevator operation when the output of the motor 5 is high, the amount of dust flowing into the motor 5 can be suppressed with a simple configuration, and the cooling function inside the motor 5 can be more reliably ensured.

[0059] Furthermore, since the second cover 62 is detachably attached to the motor 5, the second cover 62 removed from the elevator hoisting machine's motor 5 can be reused by attaching it to the motor of another elevator hoisting machine used during the construction period of the building. Therefore, when multiple elevator hoisting machines are used in the construction of a building, the cost required per elevator hoisting machine can be reduced.

[0060] Furthermore, the outer periphery of the second cover 62 is a cover mounting portion 621a that overlaps the motor 5 while avoiding the first cover 61. The cover mounting portion 621a is attached to the motor 5 by mounting screws 63. Therefore, the second cover 62 can be attached to the motor 5 with a simple configuration.

[0061] Furthermore, the mesh size of the second dust filter 622 is finer than that of the first dust filter 612. Therefore, during construction of a building, the second dust filter 622 can more effectively capture dust mixed in the cooling air flowing into the motor 5. This further ensures that the amount of dust flowing into the motor 5 is suppressed. In addition, the cooling air can pass through the first dust filter 612 more easily than the second dust filter 622, and the first dust filter 612 can suppress the reduction in the amount of cooling air flowing into the motor 5. This further ensures that the cooling function inside the motor 5 is maintained.

[0062] Furthermore, in such a dustproof device 6, the first cover 61 has a first dust filter 612, and the second cover 62 has a second dust filter 622. When the first cover 61 and the second cover 62 are attached to the motor 5, the cooling air generated by the operation of the blower 7 flows from outside the motor 5, sequentially passing through the second dust filter 622, the first dust filter 612, and the cooling air intake 511, and then flowing inside the motor 5. For this reason, during construction of a building, by attaching the first cover 61 and the second cover 62 to the motor 5, the amount of dust flowing into the motor 5 can be suppressed with a simple configuration, and the cooling function inside the motor 5 can be more reliably ensured. Also, during normal operation of the elevator, by removing the second cover 62 from the motor 5, the amount of dust flowing into the motor 5 can be suppressed with a simple configuration, and the cooling function inside the motor 5 can be more reliably ensured.

[0063] Embodiment 2. Figure 8 is a partial cross-sectional view showing the path of cooling air generated by the operation of a blower when it flows inside the motor in an elevator hoisting machine according to Embodiment 2. The second cover body member 621 in the second cover 62 is a plate-shaped member.

[0064] The second cover 61 is attached to the first cover 61 by a mounting bracket 64. Thus, the second cover 61 is attached to the motor 5 via the first cover 61. When the second cover 62 is attached to the motor 5 via the first cover 61, the mounting bracket 64 is positioned between the first cover 61 and the second cover 62. The other configurations of the second cover 62 are the same as those of the second cover 62 in Embodiment 1.

[0065] Figure 9 is an enlarged view showing the second cover 62 of Figure 8 attached to the first cover 61 by the mounting fixtures 64. Each mounting fixture 64 has a first engaging member 641 and a second engaging member 642.

[0066] The first engagement member 641 is fixed to the first cover body member 611 of the first cover 61. The first engagement member 641 is arranged around the entire circumference of the first cover 61 along a circle centered on the axis of the main shaft 2. The first engagement member 641 has a first fixing portion 641a and a first insertion portion 641b.

[0067] The first fixing portion 641a is fixed to the first cover body member 611 by a welded portion 643. Alternatively, the first fixing portion 641a may be fixed to the first cover body member 611 by, for example, a screw. The first fixing portion 641a is arranged around the entire circumference of the first cover 61.

[0068] The first insertion portion 641b protrudes radially outward from the first fixing portion 641a of the first cover 61. A gap is formed between the first insertion portion 641b and the first cover body member 611, which is open radially outward from the first cover 61. In the first engaging member 641, the first insertion portion 641b is formed only on a portion of the first cover 61 in the circumferential direction, and the first insertion portion 641b is partially missing in the circumferential direction of the first cover 61. In this embodiment, the first fixing portion 641a and the first insertion portion 641b are formed by processing a metal plate.

[0069] The second engagement member 642 is fixed to the second cover body member 621 of the second cover 62. The second engagement member 642 is arranged around the entire circumference of the second cover 62 along a circle centered on the axis of the main shaft 2. The second engagement member 642 has a second fixing portion 642a and a second insertion portion 642b.

[0070] The second fixing portion 642a is fixed to the second cover body member 621 by a welded portion 644. Alternatively, the second fixing portion 642a may be fixed to the second cover body member 621 by, for example, a screw. The second fixing portion 642a is arranged around the entire circumference of the second cover 62.

[0071] The second insertion portion 642b protrudes radially inward from the second fixing portion 642a of the second cover 62. A gap is formed between the second insertion portion 642b and the second cover body member 621, which is open radially inward of the second cover 62. In the second engaging member 642, the second insertion portion 642b is formed only on a portion of the second cover 62 in the circumferential direction, and the second insertion portion 642b is partially missing in the circumferential direction of the second cover 62. In this embodiment, the second fixing portion 642a and the second insertion portion 642b are formed by processing a metal plate.

[0072] In the mounting fixture 64, the first insertion portion 641b is placed on the second cover 62 at the position of the missing portion of the second insertion portion 642b, and the second insertion portion 642b is placed on the first cover 61 at the position of the missing portion of the first insertion portion 641b. Then, the second cover 62 is rotated circumferentially relative to the first cover 61, thereby combining the first engaging member 641 and the second engaging member 642. When the first engaging member 641 and the second engaging member 642 are combined, the first insertion portion 641b is inserted into the gap between the second insertion portion 642b and the second cover body member 621. Also, when the first engaging member 641 and the second engaging member 642 are combined, the second insertion portion 642b is inserted into the gap between the first insertion portion 641b and the first cover body member 611. The mounting bracket 64 attaches the second cover 62 to the first cover 61 by combining the first engaging member 641 and the second engaging member 642.

[0073] When the second cover 62 is attached to the first cover 61 by the mounting fixture 64, the first engaging member 641 and the second engaging member 642 are interposed around the entire circumference of the first cover 61. This prevents cooling air from flowing into the motor 5 from the outside through the gap between the first cover 61 and the second cover 62.

[0074] Furthermore, by rotating the second cover 62 relative to the first cover 61, aligning the first insertion portion 641b with the missing portion of the second insertion portion 642b, and aligning the second insertion portion 642b with the missing portion of the first insertion portion 641b, the second cover 61 becomes removable from the first cover 61. Thus, the second cover 62 is detachably attached to the first cover 61 by the mounting fixture 64. The other configurations are the same as in Embodiment 1. Also, the state of the elevator hoisting machine during building construction and during normal elevator operation is the same as in Embodiment 1.

[0075] In this elevator hoisting machine and dustproof device 6, the second cover 62 is attached to the first cover 61 by a mounting bracket 64, thereby being detachably attached to the motor 5 via the first cover 61. This eliminates the need to directly attach the second cover 62 to the motor 5 while avoiding the first cover 61. This further simplifies the configuration of the second cover 62.

[0076] In Embodiment 2, the mounting fixture 64 is configured to attach the second cover 62 to the first cover 61 by combining the first engaging member 641 and the second engaging member 642. However, the configuration of the mounting fixture 64 is not limited to this. For example, a screw that detachably attaches the second cover 62 to the first cover 61 may be used as the mounting fixture 64. In this case, the screw is passed through a through hole provided in the second cover body member 621 and screwed into a screw hole in the first cover body member 611, thereby attaching the second cover 62 to the first cover 61. Even in this way, it is not necessary to directly attach the second cover 62 to the motor 5 while avoiding the first cover 61, and the configuration of the second cover 62 can be further simplified. In addition, the gap between the first cover body member 611 and the second cover body member 621 can be eliminated around the entire circumference of the first cover 61. This prevents cooling air from flowing into the inside of the motor 5 from outside the motor 5 through the gap between the first cover 61 and the second cover 62.

[0077] Furthermore, the mounting fixture 64 in Embodiment 2 may be provided between the inner circumferential surface of the cover mounting portion 621a in Embodiment 1 and the outer circumferential surface of the motor case 51. Even in this way, the second cover 61 can be attached to the motor 5 in a simple manner and detachably.

[0078] Furthermore, in each of the above embodiments, a gap is formed between the motor case 51 and the stator 52. However, a gap does not have to be formed between the motor case 51 and the stator 52. In this case, the outer circumferential surface of the stator 52 may be directly fixed to the inner circumferential surface of the motor case 51. Even in this case, the stator 52 is cooled by the airflow flowing through the gap between the stator 52 and the rotor 53, thus ensuring a cooling function for the stator 52.

[0079] Furthermore, in each of the above embodiments, the motor 5 has a motor case 51. However, the motor case 51 is not required. In this case, an opening formed at the other end of the stator 52 becomes a cooling air intake. Also in this case, the first cover 61 and the second cover 62 are attached to the stator 52. Even in this way, the amount of dust flowing into the inside of the motor 5 can be suppressed with a simple configuration, and the cooling function for the inside of the motor 5 can be more reliably ensured.

[0080] Furthermore, in each of the above embodiments, the main shaft 2 is rotatably supported on the support base 1 via two bearings 15. However, the number of bearings 15 interposed between the main shaft 2 and the support base 1 may be one or three or more. Also, if the main shaft 2 is rotatably supported on the support base 1, there may be no bearings interposed between the main shaft 2 and the support base 1.

[0081] Furthermore, in each of the above embodiments, the mesh size of the second dust filter 622 is finer than that of the first dust filter 612. However, the mesh size of the second dust filter 622 may be coarser than that of the first dust filter 612. Alternatively, the mesh size of the second dust filter 622 may be the same as that of the first dust filter 612. Even in this way, the amount of dust flowing into the motor 5 can be suppressed with a simple configuration, and the cooling function for the inside of the motor 5 can be more reliably ensured.

[0082] The configurations shown in the embodiments described above are merely examples of the content of this disclosure. The embodiments can be combined with other known technologies. Some parts of the configurations of the embodiments can be omitted or modified without departing from the gist of this disclosure. [Explanation of Symbols]

[0083] 3 drive sheave, 5 motor, 6 dustproof device, 7 blower, 61 first cover, 62 second cover, 63 mounting screws (mounting fixtures), 64 mounting fixtures, 511 cooling air intake, 612 first dustproof filter, 621a cover mounting section, 622 second dustproof filter.

Claims

1. Drive sheave and, A cooling air intake is formed, and a motor is provided to generate the driving force to rotate the drive sheave, A dustproof device attached to the motor while covering the cooling air intake, A blower generates cooling air from the airflow that flows through the inside of the motor, passing sequentially from the outside of the motor through the dustproof device and the cooling air intake. Equipped with, The dustproof device comprises a first cover that covers the cooling air intake port, and a second cover that is detachably attached to the motor and positioned on the opposite side of the first cover from the cooling air intake port side. The first cover has a first dust filter, The second cover has a second dust filter, The cooling air generated by the operation of the blower passes sequentially through the second dust filter and the first dust filter in the dustproof device of the elevator hoisting machine.

2. The outer periphery of the second cover is a cover mounting portion that overlaps the motor while avoiding the first cover. The elevator hoisting machine according to claim 1, wherein the cover mounting portion is attached to the motor by a mounting device.

3. The elevator hoisting machine according to claim 1, wherein the second cover is attached to the first cover by a mounting device, and thereby attached to the motor via the first cover.

4. The elevator hoisting machine according to any one of claims 1 to 3, wherein the mesh size of the second dust filter is finer than that of the first dust filter.

5. A first cover covers the cooling air intake formed on the motor that generates the driving force to rotate the drive sheave, A second cover is detachably attached to the motor, positioned on the opposite side of the first cover from the cooling air intake side. Equipped with, The first cover has a first dust filter, The second cover has a second dust filter, With the first cover and the second cover attached to the motor, the cooling air generated by the operation of the blower flows from outside the motor, sequentially through the second dust filter, the first dust filter, and the cooling air intake, and into the inside of the motor, in a dustproof device for an elevator hoisting machine.

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