Elevator hoisting machine and dust prevention device for elevator hoisting machine

Abstract

Provided are an elevator hoist and a dustproof device for an elevator hoist that can suppress the amount of dust that flows into the inside of a motor with a simple configuration and can more reliably ensure the cooling function for the inside of the motor. [Solution] In an elevator hoist, a first cover 61 having a first dust filter 612 covers a cooling air inlet 511 formed in a motor 5. A second cover 62 having a second dust filter 622 is detachably attached to the motor 5, positioned on the opposite side of the first cover 61 from the cooling air inlet 511. A blower 7 generates cooling air, which flows from the outside of the motor 5 through a dust prevention device 6 and the cooling air inlet 511 in that order, and then flows inside the motor 5. The cooling air generated by the operation of the blower 7 passes through the second dust prevention filter 622 and the first dust prevention filter 612 in that order in the dust prevention device 6.

Description

[Technical Field]

[0001] The present disclosure relates to an elevator hoisting machine and a dust prevention device for an elevator hoisting machine. [Background technology]

[0002] During construction work on a building, elevator hoists are sometimes used to transport materials and other items. When the elevator hoist is in operation, 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 in operation during construction work on a building, cooling air containing a large amount of dust flows into the inside of the motor, making it more likely to malfunction.

[0003] Patent Document 1 discloses an elevator hoist in which an annular duct is formed between an outer cover and an inner cover, and a portion of the cooling air flowing through the annular duct is directed into the motor in order to reduce the amount of dust that flows into the motor. An exhaust duct is formed at the lower end of the annular duct. Of the cooling air flowing through the annular duct, air containing a large amount of dust flows into the exhaust duct instead of flowing into the motor due to inertia caused by the flow of the cooling air. This reduces the amount of dust that flows into the motor. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-56120 Summary of the Invention [Problem to be solved by the invention]

[0005] In the conventional elevator hoist disclosed in Patent Document 1, in order to suppress the amount of dust that flows into the inside of the motor, it is necessary to form not only an annular duct between the outer cover and the inner cover, but also an exhaust duct at the bottom end of the annular duct, which makes the structure for suppressing the amount of dust that flows into the inside of the motor complicated.

[0006] Furthermore, in the conventional elevator traction machine disclosed in Patent Document 1, only a portion of the cooling air flowing through the annular duct flows inside the motor. This reduces the amount of cooling air flowing inside the motor. Therefore, during normal elevator operation, when the motor's output is higher than during building construction, it becomes difficult to ensure the cooling function for the inside of the motor.

[0007] The present disclosure is intended to solve the above-mentioned problems, and aims to provide an elevator hoist and a dustproof device for an elevator hoist that can suppress the amount of dust that flows into the interior of the motor with a simple configuration and can more reliably ensure the cooling function for the interior of the motor. [Means for solving the problem]

[0008] The elevator hoisting machine according to the present disclosure comprises a drive sheave, a motor having a cooling air inlet formed therein and generating a driving force to rotate the drive sheave, a dustproof device attached to the motor while covering the cooling air inlet, and a blower that generates cooling air by passing air from the outside of the motor through the dustproof device and the cooling air inlet in sequence and flowing inside the motor, the dustproof device having a first cover that covers the cooling air inlet and a second cover that is detachably attached to the motor while positioned on the opposite side of the first cover from the cooling air inlet side, the first cover having a first dustproof filter and the second cover having a second dustproof filter, and the cooling air generated by operation of the blower passes through the second dustproof filter and the first dustproof filter in sequence in the dustproof device. In addition, the dustproof device for an elevator hoist according to the present disclosure comprises a first cover that covers a cooling air inlet formed in a motor that generates driving force to rotate a drive sheave, and a second cover that is detachably attached to the motor while being positioned on the opposite side of the first cover from the cooling air inlet side, the first cover having a first dustproof filter and the second cover having a second dustproof filter, and when the first cover and second cover are attached to the motor, cooling air generated by operation of the blower flows from the outside of the motor, passing sequentially through the second dustproof filter, the first dustproof filter and the cooling air inlet, and then into the inside of the motor. [Effects of the Invention]

[0009] The elevator hoist and dustproof device for an elevator hoist according to the present disclosure can suppress the amount of dust that flows into the interior of the motor with a simple configuration, and can more reliably ensure the cooling function for the interior of the motor. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a partially cutaway cross-sectional view that schematically shows an elevator hoisting machine according to a first embodiment. [Figure 2] FIG. 2 is a side view schematically showing the elevator hoisting machine of FIG. 1. [Figure 3] 2 is an enlarged view showing a state in which the cover mounting portion of FIG. 1 is mounted to the motor case with mounting screws. [Figure 4] 2 is a partial cross-sectional view showing the path of cooling air generated by the operation of the blower of FIG. 1 when it flows inside the motor. [Figure 5] 2 is a partially cutaway cross-sectional view schematically showing the elevator hoisting machine when the second cover of FIG. 1 is removed from the motor. FIG. [Figure 6] FIG. 6 is a side view schematically showing the elevator hoisting machine of FIG. 5. [Figure 7] 6 is a partial cross-sectional view showing the path of cooling air generated by the operation of the blower of FIG. 5 when it flows inside the motor. [Figure 8]10 is a partial cross-sectional view showing the path of cooling air generated by operation of a blower when it flows through the inside of a motor in an elevator hoisting machine according to a second embodiment. FIG. [Figure 9] 9 is an enlarged view showing the second cover of FIG. 8 attached to the first cover by a fastener. DETAILED DESCRIPTION OF THE INVENTION

[0011] The following describes embodiments of the subject matter of the present disclosure with reference to the accompanying drawings. In each drawing, identical or corresponding parts are designated by the same reference numerals, and redundant explanations are appropriately simplified or omitted. Note that the subject matter of the present disclosure is not limited to the following embodiments, and any component of the embodiments may be modified or omitted within the scope of the gist of the present disclosure.

[0012] Embodiment 1 During construction of a building in which an elevator is installed, the elevator hoisting machine according to the first embodiment is used to transport construction materials and other transported goods. The elevator hoisting machine is installed in a machine room located at the top of a hoistway in the building. During construction of the building, the construction materials are transported vertically by the elevator hoisting machine moving vertically the hoisting rope that suspends the construction materials in the hoistway.

[0013] After an elevator is installed in a building, the elevator hoist used during construction is used as the elevator's drive device. In an elevator, the elevator rope suspending the car and counterweight in the hoistway is wound around the elevator hoist. During normal elevator operation, the driving force of the elevator hoist moves the elevator rope, causing the car and counterweight to move up and down in the hoistway.

[0014] FIG. 1 is a partially cutaway cross-sectional view that schematically shows an elevator hoisting machine according to the first embodiment. FIG. 2 is a side view that schematically shows the elevator hoisting machine of FIG. 1. FIGS. 1 and 2 show the state of the elevator hoisting machine when transporting construction materials during 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 stand 1 has a base 11, a first support part 12, and a second support part 13. The base 11 is arranged horizontally in a machine room. The first support part 12 and the second support part 13 are fixed to the upper surface of the base 11.

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

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

[0018] The drive sheave 3 is fixed to the main shaft 2. This allows the drive sheave 3 to rotate integrally with the main shaft 2 relative 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 formed on the outer periphery of the drive sheave 3, each extending in the circumferential direction of the drive sheave 3. During construction of a building, a hoisting rope for suspending materials or other construction transported items is wound around the drive sheave 3. The hoisting rope for suspending the construction transported items is inserted into one of the plurality of rope grooves.

[0020] The hoisting machine body 4 is supported by a first support part 12. The hoisting machine body 4 is arranged on the opposite side of the first support part 12 from the drive sheave 3 side in the axial direction of the main shaft 2. The hoisting machine body 4 has a motor 5, a dust prevention device 6, and a blower 7.

[0021] The motor 5 generates a driving force that rotates the main shaft 2 and the drive sheave 3. The motor 5 has a motor case 51, a stator 52, and a rotor 53.

[0022] Motor case 51 is cylindrical in shape. Motor case 51 is disposed so as to surround the axis of main shaft 2. One end of motor case 51 is fixed to first support part 12. An opening is formed at the other end of motor case 51 as cooling air intake port 511.

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

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

[0025] Rotor 53 is disposed inside stator 52. Rotor 53 is fixed to main shaft 2. This allows rotor 53 to rotate integrally with main shaft 2. Rotor 53 has a cylindrical shape. Rotor 53 is disposed coaxially with main shaft 2. A gap is formed between the outer peripheral surface of rotor 53 and the inner peripheral surface of stator 52.

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

[0027] A rotating magnetic field is generated in the stator 52 by supplying power to the stator winding. When a rotating magnetic field is generated in the stator 52, the rotor 53 rotates integrally with the main shaft 2 relative to the support base 1 around the axis of the main shaft 2. As a result, the motor 5 generates a driving force that rotates the main shaft 2 and the drive sheave 3 by supplying power to the stator winding. When the rope suspending the construction work load is wound around the drive sheave 3, the drive sheave 3 rotates, and the construction work load moves up and down in accordance with the rotation of the drive sheave 3.

[0028] Dust prevention device 6 is attached to motor 5 as a dust prevention device for an elevator hoist, covering cooling air intake 511. Dust prevention device 6 captures dust mixed in the air passing through dust prevention device 6, thereby removing the dust from the air.

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

[0030] The blower 7 has a fan (not shown) and a fan motor (not shown). When power is supplied to the fan motor, the fan motor generates driving force to rotate the fan. By rotating the fan, the blower 7 generates an airflow as cooling air for cooling the inside of the motor 5. The cooling air flows from the outside of the motor 5, passes through the dustproof device 6 and the cooling air intake 511 in that order, flows inside the motor 5, and is then discharged to the outside of the motor 5 through the ventilation opening. In the hoisting machine main body 4, the cooling air flows inside the motor 5 to cool it, thereby preventing failure of the motor 5 due to temperature rise.

[0031] Dust is mixed in the air around the motor 5. Therefore, when cooling air is generated by the operation of the blower 7, there is a risk that the dust will flow into the interior of the motor 5 along with the cooling air. If the amount of dust flowing into the interior of the motor 5 increases and exceeds the capacity of the motor 5, the motor 5 may malfunction due to the dust. The dust prevention device 6 captures dust mixed in the cooling air passing through the dust prevention device 6 and removes the dust from the cooling air. This reduces the amount of dust that flows into the interior of 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 inlet 511. The first cover 61 is attached to the motor case 51 by welding, screws, etc. The first cover 61 has a first cover main body member 611 and a first dust filter 612.

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

[0035] The first dust filters 612 are disposed in the plurality of first openings 613, respectively. The first dust filters 612 are attached to the first cover main body member 611. The first dust filters 612 are made of a material that allows air to pass through. For example, fiber is used as the material of the first dust filters 612. The first dust filters 612 filter out and capture dust mixed in the air as the air passes through the first dust filters 612.

[0036] In the first cover 61, for example, the first dust filter 612 may be attached to the first cover main body member 611 by attaching a pressing plate to the first cover main body member 611 and using the pressing plate to press a portion of the first dust filter 612 against the first cover main body member 611. In addition, in the first cover 61, the first dust filter 612 may be attached to the first cover main body member 611 by sandwiching the first cover main body member 611 between a pair of wire meshes with the first dust filter 612 placed in the first opening 613.

[0037] The second cover 62 is attached to the motor 5 in a state where it is located at a position opposite to the cooling air intake port 511 side of the first cover 61. As a result, the second cover 62 is located at a position 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 means of mounting screws 63 as mounting fixtures. This makes it possible to remove the second cover 62 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 has a second cover main body member 621 and a second dust filter 622 .

[0040] The outer periphery of the second cover main body member 621 forms a cylindrical cover mounting portion 621a. As a result, the outer periphery of the second cover 62 forms the cover mounting portion 621a. When the second cover 62 is attached to the motor case 51, the first cover 61 is positioned inside the cover mounting portion 621a, and the inner periphery of the cover mounting portion 621a fits into the outer periphery of the motor case 51. As a result, the cover mounting portion 621a overlaps the outer periphery of the motor case 51, avoiding the first cover 61. The cover mounting portion 621a is attached to the motor case 51 with the mounting screws 63, and the second cover 62 is attached to the motor case 51.

[0041] 3 is an enlarged view showing the cover mounting portion 621a of FIG. 1 attached to the motor case 51 with the mounting screw 63. The cover mounting portion 621a has a through-hole 621b formed therein, through which the threaded portion of the mounting screw 63 passes. The through-hole 621b is a through-hole that passes through the cover mounting portion 621a. The cover mounting portion 621a is fastened to the motor case 51 by threading the threaded portion of the mounting screw 63, which has been passed through the through-hole 621b, into the threaded hole of the motor case 51. In this way, the cover mounting portion 621a is attached to the motor case 51.

[0042] 1, 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 dustproof device 6 is viewed along the axial direction of main shaft 2, the area of ​​each first opening 613 is contained within the area of ​​each second opening 623.

[0043] The second dust filters 622 are disposed in the plurality of second openings 623, respectively. The second dust filters 622 are attached to the second cover main body member 621. The second dust filters 622 are made of a material that allows air to pass through. For example, fiber is used as the material of the second dust filters 622. The second dust filters 622 filter out and capture dust mixed in the air as the air passes through the second dust filters 622.

[0044] In the second cover 62, for example, the second dust filter 622 may be attached to the second cover main body member 621 by attaching a pressing plate to the second cover main body member 621 and using the pressing plate to press a portion of the second dust filter 622 against the second cover main body member 621. In addition, in the second cover 62, the second dust filter 622 may be attached to the second cover main body member 621 by sandwiching the second cover main body member 621 with a pair of wire meshes in a state in which the second dust filter 622 is placed in the second opening 623.

[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 smaller dust particles than the dust particles 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] 4 is a partial cross-sectional view showing the path of cooling air generated by operation of blower 7 in FIG. 1 as it flows through the interior of motor 5. As indicated by arrow A, cooling air generated by operation of blower 7 flows from the outside of motor 5, sequentially passing through second dust filter 622, first dust filter 612, and cooling air inlet 511, and then into the interior of motor 5. At this time, dust mixed in the cooling air is captured by each of second dust filter 622 and first dust filter 612. This reduces the amount of dust that flows into the interior of motor 5.

[0047] The cooling air then flows through the gap between the motor case 51 and the stator 52 and the gap between the stator 52 and the rotor 53 inside the motor 5 toward the first support part 12. At this time, the stator 52 and the rotor 53 are cooled by the cooling air. The cooling air then passes through the ventilation opening of the motor 5 and the fan 7 before being discharged to the outside of the motor 5.

[0048] During construction work on a building, the amount of dust mixed in the air around the motor 5 increases. Therefore, during construction work on a building, the amount of dust that flows into the interior of the motor 5 together with the cooling air generated by the operation of the fan 7 may exceed the capacity of the motor 5.

[0049] During construction of a building, construction materials are transported by an elevator hoist with the first cover 61 and the second cover 62 of the dust prevention device 6 attached to the motor 5. This allows the first cover 61 and the second cover 62 to remove dust mixed in the cooling air, thereby more reliably suppressing the amount of dust that flows into the motor 5.

[0050] Furthermore, during construction work on a building, construction materials are transported at a low speed, so the output of the elevator hoisting machine motor 5 is reduced. As a result, the temperature inside the motor 5 is less likely to rise during construction work on a building. Therefore, even if the amount of cooling air flowing inside the motor 5 is limited by the resistance of each of the first cover 61 and the second cover 62, the cooling function of cooling each of the stator 52 and the rotor 53 is ensured during construction work on a building.

[0051] Next, the elevator hoisting machine during normal elevator operation will be described. After construction of a building is completed and the elevator is installed in the building, the elevator begins normal operation. During normal elevator operation, the elevator hoisting machine operates with the second cover 62 detached from the motor 5.

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

[0053] FIG. 7 is a partial cross-sectional view showing the path of cooling air generated by operation of the blower 7 in FIG. 5 as it flows through the interior of the motor 5. The cooling air generated by operation of the blower 7 flows from the outside of the motor 5, as indicated by arrow A, through the first dust filter 612 and the cooling air inlet 511, and then into the interior of the motor 5. At this time, dust mixed in the cooling air is captured by the first dust filter 612. At this time, the threaded holes in the motor case 51 are blocked by the mounting screws 63, preventing the cooling air from flowing from the outside of the motor 5 through the threaded holes in the motor case 51 into the interior of the motor 5. This reduces the amount of dust that flows into the interior of the motor 5. The subsequent path of the cooling air is the same as when the second cover 62 is attached to the motor 5. As a result, the stator 52 and the rotor 53 are cooled by the cooling air, ensuring the cooling function of each of the stator 52 and the rotor 53.

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

[0055] Furthermore, during normal elevator operation, the output of motor 5 of the elevator hoisting machine is higher than the output of motor 5 of the elevator hoisting machine during building construction. As a result, the temperature inside motor 5 is likely to rise during normal elevator operation. However, during normal elevator operation, second cover 62 is removed from motor 5, making it easier for cooling air to flow into motor 5 than during building construction, and the amount of cooling air flowing inside motor 5 is greater than during building construction. Therefore, even during normal elevator operation when the temperature inside motor 5 is likely to rise, the cooling function of cooling air for each of stator 52 and rotor 53 is sufficiently ensured.

[0056] In this elevator hoist, the dust prevention device 6 has a first cover 61 and a second cover 62. The first cover 61 covers a cooling air inlet 511 formed in the motor 5. The second cover 62 is detachably attached to the motor 5, positioned on the opposite side of the first cover 61 from the cooling air inlet 511. The first cover 61 has a first dust prevention filter 612. The second cover 62 has a second dust prevention filter 622. The blower 7 generates cooling air, which flows from the outside of the motor 5 through the dust prevention device 6 and the cooling air inlet 511 in that order and then flows inside the motor 5. The cooling air generated by the operation of the blower 7 passes through the second dust prevention filter 622 and the first dust prevention filter 612 in the dust prevention device 6 in that order.

[0057] Therefore, simply by attaching the first cover 61 and the second cover 62 to the motor 5, dust mixed in the cooling air flowing into the interior of the motor 5 can be removed from the cooling air by the second dust filter 622 and the first dust filter 612, respectively. This makes it possible to more reliably remove dust flowing into the interior of the motor 5, even when a large amount of dust is mixed in the air around the motor 5 during construction work on a building. Furthermore, it is possible to make the cooling air that has passed through the second dust filter 622 and the first dust filter 612, respectively, flow inside the motor 5. Therefore, during construction work on a building, the amount of dust flowing into the interior of the motor 5 can be suppressed with a simple configuration, and the cooling function for the interior of 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 building construction. Therefore, even when the second cover 62 is removed from the motor 5, the first dust filter 612 removes dust from the cooling air, preventing the motor 5 from exceeding its dust tolerance. This makes it possible to suppress the amount of dust flowing into the interior of the motor 5 with a simple configuration, even during normal elevator operation. Furthermore, when the second cover 62 is removed from the motor 5, the amount of cooling air flowing into the interior of the motor 5 increases. This makes it possible to increase the amount of cooling air flowing through the interior of the motor 5 while suppressing the amount of dust flowing into the interior of the motor 5 during normal elevator operation. Therefore, even during normal elevator operation when the output of the motor 5 is increased, the amount of dust flowing into the interior of the motor 5 can be suppressed with a simple configuration, and the cooling function for the interior of the motor 5 can be more reliably ensured.

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

[0060] Additionally, the outer periphery of the second cover 62 forms a cover mounting portion 621a that overlaps the motor 5, avoiding the first cover 61. The cover mounting portion 621a is attached to the motor 5 with mounting screws 63. This allows the second cover 62 to be attached to the motor 5 with a simple structure.

[0061] The mesh size of the second dust filter 622 is finer than that of the first dust filter 612. Therefore, during construction work on a building, the second dust filter 622 can more reliably capture dust mixed in the cooling air flowing into the interior of the motor 5. This makes it possible to more reliably suppress the amount of dust flowing into the interior of the motor 5. Furthermore, the cooling air can pass through the first dust filter 612 more easily than through the second dust filter 622, and the first dust filter 612 can suppress a decrease in the amount of cooling air flowing into the interior of the motor 5. This makes it possible to more reliably ensure the cooling function for the interior of the motor 5.

[0062] In the dust prevention 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, cooling air generated by the operation of the blower 7 flows from the outside of the motor 5 through the second dust filter 622, the first dust filter 612, and the cooling air inlet 511, in that order, into the interior of the motor 5. Therefore, by attaching the first cover 61 and the second cover 62 to the motor 5 during construction work on a building, the amount of dust that flows into the interior of the motor 5 can be suppressed with a simple configuration and the cooling function for the interior of the motor 5 can be more reliably ensured. Furthermore, by removing the second cover 62 from the motor 5 during normal elevator operation, the amount of dust that flows into the interior of the motor 5 can be suppressed with a simple configuration and the cooling function for the interior of the motor 5 can be more reliably ensured.

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

[0064] The second cover 61 is attached to the first cover 61 by a fixture 64. As a result, 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 fixture 64 is disposed between the first cover 61 and the second cover 62. Other configurations of the second cover 62 are the same as the configurations of the second cover 62 in the first embodiment.

[0065] 9 is an enlarged view showing the second cover 62 of FIG. 8 attached to the first cover 61 by attachment members 64. Each attachment member 64 has a first hook member 641 and a second hook member 642.

[0066] The first hook member 641 is fixed to the first cover main body member 611 of the first cover 61. The first hook member 641 is arranged around the entire circumference of the first cover 61 along a circle whose center is the axis of the main shaft 2. The first hook 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 main body member 611 by a welded portion 643. The first fixing portion 641a may also be fixed to the first cover main body member 611 by, for example, a screw. The first fixing portion 641a is arranged around the entire periphery of the first cover 61.

[0068] The first insertion portion 641b protrudes from the first fixing portion 641a radially outward of the first cover 61. A gap that is open radially outward of the first cover 61 is formed between the first insertion portion 641b and the first cover main body member 611. In the first hooking 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 hook member 642 is fixed to the second cover main body member 621 of the second cover 62. The second hook member 642 is arranged around the entire circumference of the second cover 62 along a circle whose center is the axis of the main shaft 2. The second hook 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 main body member 621 by a welded portion 644. The second fixing portion 642a may be fixed to the second cover main body member 621 by, for example, a screw. The second fixing portion 642a is arranged around the entire periphery of the second cover 62.

[0071] The second insertion portion 642b protrudes from the second fixing portion 642a toward the radially inner side of the second cover 62. A gap that is open toward the radially inner side of the second cover 62 is formed between the second insertion portion 642b and the second cover main body member 621. In the second hooking 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 overlapped with the second cover 62 at the position of the notched portion of the second insertion portion 642b, and the second insertion portion 642b is overlapped with the first cover 61 at the position of the notched portion of the first insertion portion 641b, and then the second cover 62 is rotated in the circumferential direction relative to the first cover 61, thereby combining the first hooking member 641 and the second hooking member 642. When the first hooking member 641 and the second hooking member 642 are combined, the first insertion portion 641b is inserted into the gap between the second insertion portion 642b and the second cover main body member 621. When the first hooking member 641 and the second hooking member 642 are combined, the second insertion portion 642b is inserted into the gap between the first insertion portion 641b and the first cover main body member 611. The attachment 64 attaches the second cover 62 to the first cover 61 by combining the first hooking member 641 and the second hooking member 642 .

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

[0074] Furthermore, by rotating second cover 62 relative to first cover 61 and aligning first insertion portion 641b with the position of the notched portion of second insertion portion 642b, and aligning second insertion portion 642b with the position of the notched portion of first insertion portion 641b, second cover 61 can be removed from first cover 61. Therefore, second cover 62 is detachably attached to first cover 61 by mounting fixture 64. Other configurations are the same as in embodiment 1. Furthermore, the states of the elevator hoist during construction of the building and during normal elevator operation are also the same as in embodiment 1.

[0075] In such an elevator hoist and dustproof device 6, the second cover 62 is attached to the first cover 61 by the mounting fixture 64, and is thereby detachably attached to the motor 5 via the first cover 61. This eliminates the need to attach the second cover 62 directly to the motor 5, avoiding the first cover 61. This further simplifies the configuration of the second cover 62.

[0076] In the second embodiment, the mounting fixture 64 attaches the second cover 62 to the first cover 61 by combining the first hook member 641 and the second hook member 642. However, the configuration of the mounting fixture 64 is not limited thereto. 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 second cover 62 is attached to the first cover 61 by threading a screw passed through a through-hole provided in the second cover main body member 621 into a threaded hole in the first cover main body member 611. This also eliminates the need to directly attach the second cover 62 to the motor 5 while avoiding the first cover 61, further simplifying the configuration of the second cover 62. Furthermore, it is possible to eliminate a gap between the first cover main body member 611 and the second cover main body member 621 around the entire circumference of the first cover 61. This prevents cooling air from entering the interior of the motor 5 from the outside of the motor 5 through the gap between the first cover 61 and the second cover 62.

[0077] Furthermore, the mounting fixture 64 in the second embodiment may be provided between the inner peripheral surface of the cover mounting portion 621a in the first embodiment and the outer peripheral surface of the motor case 51. In this way, the second cover 61 can be detachably mounted to the motor 5 with a simple structure.

[0078] Furthermore, in each of the above-described 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 peripheral surface of the stator 52 may be directly fixed to the inner peripheral surface of the motor case 51. Even in this case, the stator 52 is cooled by the airflow that flows through the gap between the stator 52 and the rotor 53, ensuring the cooling function for the stator 52.

[0079] In each of the above embodiments, the motor 5 has a motor case 51. However, the motor case 51 need not be provided. In this case, an opening formed at the other end of the stator 52 serves as the cooling air intake. In this case, the first cover 61 and the second cover 62 are attached to the stator 52. Even in this case, the amount of dust that flows into the interior of the motor 5 can be suppressed with a simple configuration, and the cooling function for the interior of the motor 5 can be more reliably ensured.

[0080] In each of the above-described embodiments, the main spindle 2 is rotatably supported by the support base 1 via two bearings 15. However, the number of bearings 15 interposed between the main spindle 2 and the support base 1 may be one, or may be three or more. Furthermore, as long as the main spindle 2 is rotatably supported by the support base 1, it is not necessary for a bearing to be interposed between the main spindle 2 and the support base 1.

[0081] Furthermore, in each of the above-described 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. Furthermore, the mesh size of the second dust filter 622 may be the same as that of the first dust filter 612. Even in this case, the amount of dust that flows into the interior of the motor 5 can be suppressed with a simple configuration, and the cooling function for the interior of the motor 5 can be more reliably ensured.

[0082] The configurations described in the above embodiments are merely examples of the contents of the present disclosure. The embodiments can be combined with other known technologies. Part of the configuration of the embodiments can be omitted or modified without departing from the gist of the present disclosure. [Explanation of symbols]

[0083] 3 Drive sheave, 5 Motor, 6 Dust prevention device, 7 Blower, 61 First cover, 62 Second cover, 63 Mounting screw (mounting fixture), 64 Mounting fixture, 511 Cooling air intake port, 612 First dust prevention filter, 621a Cover mounting portion, 622 Second dust prevention filter.

Claims

1. A drive sheave; a motor having a cooling air intake formed therein and generating a driving force for rotating the drive sheave; a dustproof device attached to the motor in a state of covering the cooling air intake; a blower that generates an air current as cooling air from the outside of the motor, passing through the dustproof device and the cooling air intake port in order and flowing inside the motor; Equipped with the dustproof device includes a first cover that covers the cooling air inlet, and a second cover that is detachably attached to the motor and is disposed on a side of the first cover opposite to the cooling air inlet, 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 through the second dust filter and the first dust filter in the dust prevention device in this order.

2. an outer periphery of the second cover serves as 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 fixture.

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

4. 4. The elevator hoisting machine according to claim 1, wherein the second dust filter has a finer mesh than the first dust filter.

5. a first cover for covering a cooling air intake formed on a motor that generates a driving force for rotating the drive sheave; a second cover that is detachably attached to the motor while being disposed on a position opposite to the cooling air intake side of the first cover; Equipped with the first cover has a first dust filter; the second cover has a second dust filter; When the first cover and the second cover are attached to the motor, cooling air generated by the operation of a blower flows from the outside of the motor through the second dust filter, the first dust filter, and the cooling air inlet, in that order, before flowing into the interior of the motor.

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