JP6176863B2 - Elevator hoisting machine - Google Patents

Description

  Embodiments described herein relate generally to an elevator hoisting machine including a brake device.

  For example, a gearless hoist used for a machine roomless elevator includes a brake device that holds the car in a stopped state or that suddenly stops the car in an emergency. The brake device is located at one end of a hoisting machine with a built-in electric motor part, and is exposed to the hoistway of the building.

JP 2007-331881 A JP 2010-126325 A

  The hoistway is directly affected by the outside air temperature, so there is a great difference in temperature. For this reason, in the elevator in which the brake device is exposed to the hoistway, the ambient temperature of the brake device varies greatly. In particular, when the brake device is affected by moisture due to the temperature difference in the hoistway, it cannot be denied that the braking force of the brake device varies.

  An object of the present invention is to obtain an elevator hoisting machine that can stabilize the ambient temperature of a brake device by using exhaust heat after cooling an electric motor unit and suppress variation in braking force.

According to the embodiment, an elevator hoisting machine is provided in a hoistway and accommodates a rotating shaft that rotates a traction sheave, and a rotor that is housed inside the case and connected to the rotating shaft. An electric motor unit having a stator that coaxially surrounds the rotor, and an end of the rotating shaft that protrudes out of the case, and is exposed to the hoistway and is attached to the traction sheave. A brake device that applies a braking force via the rotating shaft, and a fan device that is provided in the case and that operates independently of the electric motor unit and blows cooling air toward the electric motor unit. I have.
The brake device is fixed to the end of the rotating shaft, rotates following the rotating shaft, and has a friction disk positioned on the opposite side of the case, and the friction of the brake disk And a friction member that generates a braking force by contacting the surface. The case has a discharge opening for discharging the cooling air having passed through the motor unit towards the brake disc from the opposite side of the friction surface.

1 is a perspective view of a machine roomless elevator according to an embodiment. It is sectional drawing of the hoisting machine provided with the brake device.

  Hereinafter, embodiments will be described with reference to the drawings.

  FIG. 1 discloses a machine room-less elevator 1 that does not require a dedicated machine room. The elevator 1 has a hoistway 2 provided in a building, and a car 3 and a counterweight 4 are arranged inside the hoistway 2. The car 3 is supported by the hoistway 2 so as to be movable up and down via first guide rails 5 a and 5 b fixed to the inner wall surface of the hoistway 2. The counterweight 4 is supported by the hoistway 2 so as to be movable up and down via second guide rails 6a and 6b fixed to the inner wall surface of the hoistway 2.

  As shown in FIG. 1, a support frame 7 is disposed on the upper part of the hoistway 2. The support frame 7 is supported by the upper ends of the first guide rails 5a and 5b and the upper ends of the second guide rails 6a and 6b. Further, a gearless hoisting machine 10 having a traction sheave 9 is fixed on the support frame 7.

  The car 3 and the counterweight 4 are suspended from the hoistway 2 via the main rope 11. One end 11 a of the main rope 11 is connected to a first rope hitch 12 fixed to the support frame 7. The other end 11 b of the main rope 11 is connected to a second rope hitch 13 fixed to the support frame 7.

  Further, the main rope 11 has an intermediate portion 11c straddling between one end 11a and the other end 11b. An intermediate portion 11c of the main rope 11 includes car sheaves 14a and 14b provided on the car 3, traction sheave 9 of the hoisting machine 10, and first deflecting sheaves 15a and 15b provided on the hoistway 2. The second baffle sheave 16 provided on the support frame 7 and the weight sheaves 17 a and 17 b provided on the counterweight 4 are continuously wound around.

  Accordingly, the car 3 and the counterweight 4 are moved up and down along the hoistway 2 by hoisting or unwinding the main rope 11 with the traction sheave 9 of the hoisting machine 10.

  FIG. 2 shows details of the hoisting machine 10 located in the upper part of the hoistway 2. As shown in FIG. 2, the hoisting machine 10 includes a case 20 as an outer shell, an electric motor unit 21 that drives the traction sheave 9, and a brake device 22 that applies a braking force to the traction sheave 9 as main elements.

  The case 20 is fixed on the support frame 7. The case 20 includes a cylindrical case main body 23, a first end plate 24a that closes one open end of the case main body 23, a second end plate 24b that closes the other open end of the case main body 23, It has.

  The rotating shaft 25 is accommodated in the case 20. The rotating shaft 25 has a first end 25a and a second end 25b. The first end portion 25a is supported by a central portion of the first end plate 24a via a bearing 26a. The second end portion 25b is supported by a central portion of the second end plate 24b via a bearing 26b. For this reason, the rotating shaft 25 is coaxially positioned on the central axis O <b> 1 along the axial direction of the case main body 23.

  Furthermore, the first end portion 25a and the second end portion 25b of the rotating shaft 25 penetrate the first end plate 24a and the second end plate 24b and protrude out of the case 20. In the present embodiment, the traction sheave 9 is fixed to the first end portion 25 a of the rotating shaft 25 protruding outside the case 20.

  The electric motor unit 21 is a so-called inner rotor type motor, and includes a rotor 28 and a stator 29 that surrounds the rotor 28 coaxially.

  The rotor 28 has a cylindrical rotor core 30. The rotor core 30 is configured by laminating a plurality of magnetic steel plates to each other, and the rotary shaft 25 is coaxially fixed to the central portion of the rotor core 30 by means such as press-fitting.

  Further, a plurality of permanent magnets 31 are embedded in the rotor core 30. The permanent magnets 31 are arranged in the circumferential direction of the rotor core 30 so as to surround the rotation shaft 25.

  The stator 29 has a cylindrical stator core 33 around which a winding 32 is wound. The stator core 33 is configured by laminating a plurality of magnetic steel plates. The stator core 33 is inserted inside the case main body 23 and is fixed to the inner peripheral surface of the case main body 23 by means such as press fitting, shrink fitting, or spot welding.

  The stator 29 surrounds the rotor 28 coaxially. As a result, a gap 35 that is continuous in the circumferential direction is formed between the inner peripheral surface of the stator 29 and the outer peripheral surface of the rotor 28. The gap 35 extends in the axial direction of the rotating shaft 25 and is opened inside the case 20.

  The brake device 22 is an element that applies a braking force to the traction sheave 9 via the rotation shaft 25. The brake device 22 is located on the opposite side of the traction sheave 9 with the case 20 interposed therebetween.

  As shown in FIG. 2, the brake device 22 includes a frame 40, a brake disk 41, a brake pad 42, and a drive unit 43 as main elements. The frame 40 is formed in a disk shape, and an outer peripheral portion thereof is fixed to the second end plate 24 b of the case 20 via a plurality of bolts 44. According to the present embodiment, the frame 40 is disposed in parallel with the second end plate 24 b at a position away from the second end plate 24 b in the axial direction of the case 20.

  The brake disk 41 is formed in a disc shape and is coaxially fixed to the second end portion 25 b of the rotating shaft 25 protruding out of the case 20. The brake disc 41 is located between the second end plate 24 b and the frame 40. The surface of the brake disc 41 on the frame 40 side is a flat friction surface 41a.

  The brake pad 42 includes a lining material 46 that is pressed against the friction surface 41 a of the brake disk 41, and a disk-like back plate 47 that holds the lining material 46. The lining material 46 is an example of a friction member that generates a braking force by friction with the brake disk 41. The lining material 46 is desirably formed of a material that is not significantly affected by the ambient temperature of the brake device 22 or the wetness, and that has a stable friction coefficient.

  The back plate 47 is interposed between the frame 40 and the brake disc 41. The back plate 47 is supported by the frame 40 via a plurality of guide shafts 48 protruding from the frame 40 toward the case 20.

  More specifically, the back plate 47 has a straight line between a braking position where the lining material 46 contacts the friction surface 41a of the brake disk 41 and a braking release position where the lining material 46 is separated from the friction surface 41a of the brake disk 41. It is possible to move. FIG. 2 shows a state in which the back plate 47 is moved to the brake release position.

  The drive unit 43 forcibly moves the plurality of compression coil springs 50 that elastically bias the back plate 47 of the brake pad 42 toward the braking position, and the back plate 47 of the brake pad 42 toward the braking release position. And an electromagnetic coil unit 51 to be operated.

  The compression coil spring 50 is interposed between the frame 40 and the back plate 47 in a compressed state. The electromagnetic coil unit 51 includes a movable iron core 52 and a coil 53. The movable iron core 52 protrudes from the center portion of the back plate 47 toward the frame 40. The coil 53 is supported by the frame 40 so as to surround the movable iron core 52.

  When the coil 53 is energized, a suction force that attracts the brake pad 42 toward the frame 40 acts on the movable iron core 52. As a result, the brake pad 42 moves from the braking position toward the braking release position against the urging force of the compression coil spring 50, and the lining material 46 is maintained in a state of being separated from the friction surface 41 a of the brake disc 41.

  When the power supply to the coil 53 is cut off, the attractive force acting on the movable iron core 52 is released. As a result, the brake pad 42 advances from the braking release position toward the braking position by the urging force of the compression coil spring 50, and the lining material 46 is pressed against the friction surface 41 a of the brake disc 41.

As shown in FIG. 2, a flat mounting seat 55 is formed on the outer peripheral surface of the case main body 23. The mounting seat 55 is provided at a position closer to the first end plate 24 a than the central portion along the longitudinal direction of the case body 23. Further, the mounting seat 55 has an intake port 56. The intake port 56 is opened inside the case 20 at a position corresponding to one end along the axial direction of the electric motor unit 21.

  A fan device 58 is installed on the mounting seat 55. The fan device 58 is exposed together with the case 20 and the brake device 22 inside the hoistway 2 where the difference in temperature is significant. The fan device 58 includes a fan casing 59 and an impeller 60 as main elements. The fan casing 59 is fixed to the mounting seat 55. The fan casing 59 has a suction port 61 opened in the hoistway 2 and an exhaust port 62 communicated with the suction port 56.

  The impeller 60 is housed in the fan casing 59 and incorporates a motor 63. When the motor 63 is energized, the impeller 60 rotates and air in the hoistway 2 is sucked into the fan casing 59 from the suction port 61. The sucked air is supplied as cooling air for forcibly cooling the electric motor unit 21 from the exhaust port 62 to the inside of the case 20 through the intake port 56.

  In the present embodiment, when the power of the elevator 1 is turned on, energization of the motor 63 of the fan device 58 is started, and the energization of the motor 63 is cut off when the power of the elevator 1 is turned off.

  For this reason, the fan device 58 is operated independently of the electric motor unit 21 of the hoisting machine 10. In other words, the fan device 58 continues to operate as long as the power of the elevator 1 is not turned off even when the motor unit 21 is in operation and the motor unit 21 is stopped.

  As shown in FIG. 2, the second end plate 24 b of the case 20 is located on the opposite side of the intake port 56 with the electric motor unit 21 interposed therebetween. The second end plate 24 b has a plurality of discharge ports 65. For example, the discharge ports 65 are arranged at intervals in the circumferential direction of the second end plate 24 b and communicated with the inside of the case 20 at a position corresponding to the gap 35 of the electric motor unit 21. Further, the discharge port 65 is opened toward the brake disc 41 of the brake device 22.

  In the embodiment, when the power of the elevator 1 is turned on, energization of the motor 63 of the fan device 58 is started, and the impeller 60 rotates. Thereby, the air in the hoistway 2 is supplied into the case 20. The air supplied to the case 20 passes through a gap 35 between the rotor 28 and the stator 29 as cooling air that forcibly cools the electric motor unit 21 as indicated by an arrow in FIG.

  The cooling air that has passed through the gap 35 is discharged between the electric motor unit 21 and the second end plate 24 b and is discharged out of the case 20 through the discharge port 65. Since the discharge port 65 faces the brake disk 41 of the brake device 22, the cooling air after cooling the electric motor unit 21 is blown to the brake disk 41 and the lining material 46.

  In other words, the brake disk 41 and the lining material 46 are positioned in the flow path of the cooling air discharged from the discharge port 65 to the outside of the case 20.

  According to the hoisting machine 10 of such an embodiment, the cooling air that has cooled the electric motor unit 21 while the electric motor unit 21 is in operation and when the electric motor unit 21 has stopped operating is the brake disk 41 of the brake device 22. The air is forcibly blown around the lining material 46.

  Thereby, the fluctuation | variation of the ambient temperature of the brake device 22 can be suppressed using the exhaust heat after cooling the electric motor part 21. FIG. Therefore, although the brake device 22 is exposed in the hoistway 2 having a large temperature difference, the ambient temperature of the brake device 22 can be stabilized, and the braking force of the brake device 22 varies. Can be suppressed.

  Further, by supplying the cooling air after cooling the motor unit 21 to the lining material 46, it is possible to exclude the moisture from the surrounding environment of the lining material 46 that is easily affected by moisture. As a result, there is an advantage that the braking force of the brake device 22 is stabilized and the reliability is improved.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

For example , the ambient temperature or humidity of the brake device 22 may be measured by a sensor, and the operation of the fan device may be controlled in accordance with a signal output from the sensor.

DESCRIPTION OF SYMBOLS 2 ... Hoistway, 9 ... Traction sheave, 20 ... Case, 21 ... Electric motor part, 22 ... Brake device, 25 ... Rotating shaft, 28 ... Rotor, 29 ... Stator, 41 ... Brake disk, 46 ... Friction member (lining) Material), 58 ... fan device, 65 ... discharge port.

Claims (5)

A case that is provided in the hoistway and houses a rotating shaft that rotates the traction sheave;
An electric motor unit having a rotor housed in the case and connected to the rotation shaft, and a stator that coaxially surrounds the rotor;
A brake device provided at an end portion of the rotating shaft protruding outside the case, exposed to the hoistway, and applying a braking force to the traction sheave via the rotating shaft;
A fan device that is provided in the case and is operated independently of the electric motor unit and that blows cooling air toward the electric motor unit;
The brake device is
A brake disc fixed to the end of the rotating shaft, rotating following the rotating shaft and having a friction surface positioned on the opposite side of the case;
A friction member that generates a braking force by contacting the friction surface of the brake disc,
The case is an elevator hoisting machine having a discharge port for discharging the cooling air that has passed through the electric motor unit from the opposite side of the friction surface toward the brake disk .   The elevator hoist according to claim 1, wherein the fan device constantly blows cooling air to the electric motor unit. The elevator hoisting machine according to claim 1 or 2, wherein the discharge port is opened toward the brake disc of the brake device. A case that is provided in the hoistway and has a built-in motor part that rotates the traction sheave;
A brake device provided outside the case so as to be exposed to the hoistway, and applying a braking force to the traction sheave;
A fan device that is provided in the case and continuously blows cooling air to the electric motor unit even when the electric motor unit is in operation and in a state in which the electric motor unit has stopped operating; and
The brake device is
A brake disc having a friction surface located on the opposite side of the case;
A friction member that generates a braking force by contacting the friction surface of the brake disc,
The case hoisting machine for an elevator having a discharge port for discharging the cooling air that has passed through the electric motor portion to a position opposite to the brake disk from the opposite side of the friction surface to the outside of the case . The elevator hoist according to claim 4, wherein the case has an end plate interposed between the electric motor unit and the brake disk, and the discharge port is opened in the end plate.

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