Elevator system

Abstract

The present invention provides an elevator system capable of reducing the overall installation area of elevators in a building while ensuring the number of passengers in the elevators. The elevator system according to the present invention is provided with first and second elevator cars in a single elevator shaft, a pair of car lower pulleys is provided at the lower portions of the first and second elevator cars, respectively, so that a rope is rotated in a vertical direction at the outer portions of the first and second elevator cars and in a horizontal direction at the bottom portions, and the arrangement direction of the pair of car lower pulleys of the first elevator car and the arrangement direction of the pair of car lower pulleys of the second elevator car intersect when projected onto a horizontal plane.

Description

TECHNICAL FIELD

[0001] The present application relates to an elevator system having a plurality of elevator cars independently moving within a single elevator shaft. BACKGROUND

[0002] In recent years, as a configuration of an elevator system, a system having a configuration in which a rope is respectively erected on a pair of car lower sheaves provided on a lower side of a car body frame is known (for example, refer to Patent Literature 1), and in addition, a machine room-less elevator system in which a hoist and a control device are miniaturized and provided within a shaft, thereby not requiring a rooftop machine room is also known. Furthermore, in a high-rise office building or a high-rise residential building, it is expected that an elevator is used in a wide range from a low floor to a high floor, and in particular, as a means for increasing the transport capacity of an elevator, a means in which two or more cars are arranged within the same elevator shaft (for example, refer to Patent Literature 2) or a double deck type elevator in which an upper car and a lower car are linked is known.

[0003] Patent Literature 1: Japanese Patent Application Laid-Open No. 2012-6695

[0004] Patent Literature 2: Japanese Patent No. 431150

[0005] However, in the double deck type elevator system, in order to achieve high-speed movement, a use in which a first car is dedicated to odd-numbered floors and a second car on a lower side is dedicated to even-numbered floors is performed, and thus, for example, in a case where a person who wants to go to an even-numbered floor has ridden the first car dedicated to odd-numbered floors, an inconvenience such as getting off the elevator and then getting on again can occur. SUMMARY

[0006] Therefore, the present application, in view of the above-described technical problem, aims to provide an elevator system capable of reducing the installation area of an elevator of a building as a whole while ensuring the number of passengers of an elevator.

[0007] In order to solve the above-described technical problem, the elevator system of the present application is an elevator system in which a first elevator car and a second elevator car are arranged in a single elevator shaft, characterized in that a pair of car lower sheaves is arranged on a lower portion of each of the first elevator car and the second elevator car so as to rotate a rope in a vertical direction on an outer side of each of the first elevator car and the second elevator car and in a horizontal direction on a bottom portion, and the arrangement direction of the pair of car lower sheaves of the first elevator car and the arrangement direction of the pair of car lower sheaves of the second elevator car cross when projected onto a horizontal plane.

[0008] Further, in the above elevator system, characterized in that the first elevator car and the second elevator car are guided along a pair of main rails which extend along the elevator shaft, the car lower pulley of the first elevator car is configured to wind a rope which extends in either of left and right of the main rails as viewed from the center of the car, and the car lower pulley of the second elevator car is configured to wind a rope which extends in the other of left and right of the main rails as viewed from the center of the car.

[0009] Further, in the above elevator system, the pair of main rails can be arranged in an angle direction of an angle of half of an angle of arrangement direction of the pair of car lower pulleys, or the first elevator car and the second elevator car can be independently operated and be the same size.

[0010] Further, in such an elevator system, the axes of the pulleys respectively installed to the counterweights which balance the first elevator car and the second elevator car can also cross when projected to a horizontal plane. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a configuration view of an elevator system of a first embodiment of the present application.

[0012] Figure 2 is a schematic plan view of a car portion of the elevator system of the above first embodiment.

[0013] Figure 3 is a schematic plan view of a counterweight portion of the elevator system of the above first embodiment.

[0014] Figure 4 is a configuration view of an elevator system of a second embodiment of the present application.

[0015] Figure 5 is a schematic plan view of a car portion of the elevator system of the above second embodiment.

[0016] Figure 6 is a schematic plan view of a counterweight portion of the elevator system of the above second embodiment.

[0017] Figure 7 is another schematic plan view of a car portion of a modification example of the elevator system of the above second embodiment. DETAILED DESCRIPTION

[0018] Hereinafter, referring to Figures 1 to 7 An elevator system according to each of the embodiments of the present application will be described.

[0019] [First Embodiment]

[0020] This embodiment is a so-called mechanical room-less and underhung type elevator system, as shown in Figure 1 The first elevator car 12 and the second elevator car 14 are provided in a single elevator shaft 10 extending in the vertical direction in a non-connected and independently controllable manner, as shown in FIG. 1. The first elevator car 12 is positioned on the lower side and the second elevator car 14 is positioned on the upper side in the elevator shaft 10. In addition, a pair of car lower sheaves 24, 26 are installed on the bottom of the first elevator car 12 and a pair of car lower sheaves 28, 30 are installed on the bottom of the second elevator car 14. As an example, the elevator system is a system for passenger elevators provided in a multi-story building, a facility, or the like. Hoisting ropes 20, 22 are routed in the vertical direction on the outer sides of the first and second elevator cars 12, 14 and ropes 20, 22 are routed in the horizontal direction on the bottom.

[0021] The first elevator car 12 is a substantially cubic car, has a door provided on the front surface, and has a pair of left and right guide shoes formed on the car upper end side and the car lower end side in the central portion of the car side wall to slide on a pair of left and right main rails 18 extending in the vertical direction in the elevator shaft 10. A cross head member connected by a car roof portion is provided in the vicinity of the pair of left and right guide shoes on the upper side. The pair of car lower sheaves 24, 26 are supported via rotation shafts of sheaves rotatably installed on a sheave frame not shown. The pair of car lower sheaves 24, 26 are particularly inclinedly arranged with respect to the lines of the pair of main rails connecting the outside of the car. That is, the right car lower sheave 24 is arranged at a position inside the main rail position from the entrance of the car toward the inside, and the left car lower sheave 26 is arranged at a position closer to the front side than the main rail position from the entrance of the car toward the inside. As a result, as shown in FIG. 2, the left hoisting rope 20 is positioned on the near front side and the right hoisting rope 20 is positioned on the inside. Figure 2

[0022] The second elevator car 14 is also a substantially cubic car, has a door provided on the front surface, and has a pair of left and right guide shoes formed on the car upper end side and the car lower end side in the central portion of the car side wall to slide on a pair of left and right main rails extending in the vertical direction in the elevator shaft 10. A pair of car lower sheaves 28, 30 are supported via rotation shafts of sheaves rotatably installed on a sheave frame not shown. The pair of car lower sheaves 28, 30 are particularly inclinedly arranged in the opposite direction to the first elevator car 14 with respect to the lines of the pair of main rails connecting the outside of the car. That is, the right car lower sheave 28 is arranged at a position closer to the front side than the main rail position from the entrance of the car toward the inside, and the left car lower sheave 30 is arranged at a position inside the main rail position from the entrance of the car toward the inside. As a result, as shown in FIG. 3, the left hoisting rope 20 is positioned on the near front side and the right hoisting rope 20 is positioned on the inside.​Figure 2 As shown, the right-side sling 22 is positioned on the front side, and the left-side sling 22 is positioned on the inner side. Further, the pair of car lower pulleys 28, 30 have a positional relationship in which the rotation axes of the respective pulleys are parallel.

[0023] When these first elevator car 12 and second elevator car 14 arranged in the same elevator shaft 10 are viewed from above, it is understood that the extension lines of the respective ropes of the pair of car lower pulleys 24, 26 and the pair of car lower pulleys 28, 30 are arranged so as to cross when projected onto a horizontal plane. In other words, the sling 20 for causing the first elevator car 12 to perform a hoisting operation is extended in the vertical direction at least at two places within or around the elevator shaft 10, but the sling 22 that is extended in the vertical direction at a different position from the sling 20 for the first elevator car 12 is used for the second elevator car 14. Therefore, the respective slings 20, 22 do not interfere with each other within or around the elevator shaft 10, and can move independently. These first elevator car 12 and second elevator car 14 are guided along the pair of main guide rails 18 that extend along the elevator shaft 10, and the car lower pulleys 24, 26 of the first elevator car 12 are wound with the sling 20 that extends to either side of the main guide rail 18 when viewed from the center of the car, and the car lower pulleys 28, 30 of the second elevator car 14 are wound with the sling 22 that extends to the other side of the main guide rail 18 when viewed from the center of the car. Further, as shown in FIG. 1, the pair of main guide rails 18 are arranged in the direction in which the pair of car lower pulley pairs cross at an angle of half the angle of the arrangement direction of the pair of car lower pulley pairs. Figure 2

[0024] The sling 20 of the first elevator car 12 is configured such that one rope fixing end is fixedly attached to a rope fixing portion 31 provided near the ceiling of the elevator shaft 10, and extends in the vertical direction from the rope fixing portion 31 and is wound around the car lower pulley 26 of the first elevator car 12 by approximately one-quarter turn or so. Further, the sling 20 extends upward from the other car lower pulley 24 through the bottom of the first elevator car 12. A pair of fixed pulleys 32, 34 are provided on the ceiling side of the elevator shaft 10, and the sling 20 wound around the fixed pulley 32 is wound around the traction sheave portion of a drive motor 36 to reach the fixed pulley 34. The sling 20 is extended from the fixed pulley 34 to a fixed pulley 36, and a counterweight 40 is suspended between the fixed pulley 35 and a rope fixing portion 38 that holds the other end of the sling 20. The rope fixing portion 38 is fixedly attached to the ceiling of the elevator shaft 10. Figure 1 In the first elevator car 12 and the respective pulleys of the sling 20 wound around the first elevator car 12, "A" is shown.

[0025] ​Similarly, the sling 22 of the second elevator car 14 is configured such that one end thereof is fixedly installed to a rope fixing portion 31 provided near the ceiling of the elevator shaft 10, and the sling 22 vertically extending from the rope fixing portion 31 is wound around the car body lower pulley 28 of the second elevator car 14 by approximately one quarter of a turn. Further, the sling 22 extends upward from the other car body lower pulley 30 across the bottom of the second elevator car 14. A pair of fixed pulleys 42, 44 are provided on the ceiling side of the elevator shaft 10, the sling 22 is wound around one of the fixed pulleys 42, and is wound around the traction sheave portion of the drive motor 46 to reach the other fixed pulley 44. Further, the sling 22 is suspended with a counterweight 50 between the fixed pulley 44 and a rope fixing portion 48 that holds the other end of the sling 22. In Figure 1 In the second elevator car 14, "B" is displayed on the respective pulleys at which the sling 22 of the second elevator car 14 is wound.

[0026] The positional relationship between the counterweight 40 for the first elevator car and the counterweight 50 for the second elevator car is as follows, i.e., configured to be provided in a state of being not connected in the vertical direction in a narrow common space provided along the side wall of the elevator shaft 10, and the counterweight 40 used by the first elevator car 12 located on the lower side in the elevator shaft 10 is positioned on the upper side, and the counterweight 50 used by the second elevator car 14 located on the upper side in the elevator shaft 10 is positioned on the lower side. In these counterweights 40, 50, pulleys 45, 55 are also respectively installed at the upper end portions, the sling 20 for the first elevator car is wound around the pulley 45, and the sling 22 for the second elevator car is wound around the pulley 55.

[0027] As shown in Figure 3 , for the pulley 45 installed to the counterweight 40, the long side direction in the horizontal plane facing the counterweight is taken to be the left side as the front side, and the right side as the back side, and for the pulley 55 installed to the counterweight 50, the opposite direction is taken, and the left side is taken as the back side, and the right side is taken as the front side. Therefore, in the case where the two pulleys 45, 55 are viewed from the upper side in the vertical direction, the pulleys are configured to be rotated in a state where the positions of the rotation axes are substantially identical, but the rotation surfaces of the pulleys cross each other. That is, in the first and second elevator cars 12, 14, the slings 20, 22 are configured not to be located in the same position, but the same as this, in the pulleys 45, 55 of the counterweights 40, 50, the slings 20, 22 are also configured not to be located in the same position.

[0028] Thus, in the elevator system of the present embodiment, the first elevator car 12 and the second elevator car 14 are vertically separated within the elevator shaft 10 and are controlled to operate independently of each other. This is because even within the same elevator shaft 10, independent ropes 20, 22 passing through different positions can be used, and therefore the car body lower pulleys 24, 26, 28, 30 on the car side are angled and cross in an X shape when projected onto a horizontal plane, and the counterweights 40, 50 also have pulleys 45, 55 that are angled and cross in an X shape when projected onto a horizontal plane. The present embodiment is particularly effective for a space-saving elevator system of the machine room-less type, and is particularly effective for high-rise buildings. Although it is also possible to use the first elevator car 12 and the second elevator car 14 vertically partitioned by the number of floors for use, if a space for one car to stand by is ensured above the topmost floor and below the bottommost floor, the first elevator car 12 and the second elevator car 14 can each be used between the topmost floor and the bottommost floor.

[0029] Next, the elevator system of the second embodiment will be described with reference to Figures 4 to 6 The elevator system of the present embodiment is an example in which three elevator cars 12, 14, 16 are arranged within a single elevator shaft 11. The three elevator cars 12, 14, 16 are substantially the same size, and are arranged within the elevator shaft 11 in the order of the first elevator car 12, the second elevator car 14, and the third elevator car 16 from the bottom, and in particular, have a configuration in which the third elevator car 16 is added within the same elevator shaft 11 as compared to the elevator system of the first embodiment described above.

[0030] That is, in the elevator system of the present embodiment, as in the above-described embodiments, the arrangement direction of the car body lower pulleys 24, 26, 28, 30 is set to a direction in which they cross obliquely when projected onto a horizontal plane, so as not to guide the ropes 20, 22 wound by the car body lower pulleys 24, 26, 28, 30 of the first elevator car 12 and the second elevator car 14 to the same position. Here, the third elevator car 16 is arranged above the second elevator car 14 within the same elevator shaft 11, but the third elevator car 16 is not provided with a car body lower pulley, and is provided with one car body upper pulley 19 in the ceiling portion of the third elevator car 16. As shown in FIG. 6, the rope 23 of the third elevator car 16 is guided to pass near the center of the car when projected onto a horizontal plane, and therefore the rope 23 of the third elevator car 16 does not interfere with the ropes 20, 22 guided on the outer sides of the respective cars. Figure 5

[0031] ​Similarly, on the counterweight side, the slings 20, 22, and 23 are also guided to be in different positions. The first counterweight 40, the second counterweight 50, and the third counterweight 60 are configured to be disjointed in the vertical direction and arranged in a narrow, shared space along the side wall of the elevator shaft 11, and are suspended from the slings 20, 22, and 23 respectively. Figure 6 As shown, when viewed from above, the pulleys 54, 55, and 56 of the three counterweights are arranged with their orientations reversed, forming three directions from the central axis. The uppermost counterweight 40 is connected to the lowermost first elevator car 12, the middle counterweight 50 is connected to the middle second elevator car 14, and the lowermost counterweight 60 is connected to the uppermost third elevator car 16. The pulley 54 for suspending the uppermost counterweight 40 extends along the long side of the hammer when projected onto the horizontal plane, and the remaining two pulleys 55 and 56 extend in the same intersecting direction as in the previous embodiment when projected onto the horizontal plane. As a result, the slings 20, 22, and 23 wound around the pulleys 54, 55, and 56 of each counterweight are guided to be in different positions, thereby enabling independent control in conjunction with the three elevator cars 12, 14, and 16.

[0032] Figure 7 This is a variation of the second embodiment, depicting combinations of two pairs of pulleys 72 and 74. The angle between these two pairs of pulleys 72 and 74 is configured such that, when projected onto a horizontal plane, they intersect at an angle approximately close to 90 degrees. The separation distance between the slings 20 and 22 can also be made more... Figure 5 The structure has a large distance.

[0033] In elevator systems of various embodiments, a configuration can be achieved by using car pulleys to suspend the car from the bottom of the car in pairs. Alternatively, slots, bolts, or other fixing components can be pre-oriented on the bottom of the car, and car pulleys can be installed on each frame in that direction, thereby installing the car pulleys at a predetermined angle. Alternatively, the configuration can be such that after the frame holding the pair of car pulleys is installed at the center of the bottom of the car, the angle is adjusted.

[0034] In the elevator systems described above, for two cars, a configuration is used to prevent interference between the suspension cables. However, this can also be applied to three or more cars. This is particularly advantageous in terms of transportation efficiency per unit area when constructing elevator systems for high-rise buildings. Furthermore, an example of a counterweight arranged vertically and suspended has been described, but even in a configuration where the horizontal positions are originally staggered, a configuration to prevent interference between the suspension cables can be used for two or more cars.

[0035] Explanation of reference numerals in the attached figures

[0036] 10, 11... elevator shaft; 12, 14, 16... elevator car; 18... main guide rail; 20, 22, 23... suspension rope; 24, 26, 28, 30... car lower pulley; 31, 38, 41, 48... rope fixing part; 32, 34, 35, 42, 44... fixed pulley; 36, 46... drive motor; 40, 50, 60... counterweight; 45, 54, 55, 56... pulley.

Claims

1. An elevator system comprising a first elevator car, a second elevator car, and a third elevator car arranged sequentially from bottom to top in a single elevator shaft, characterized in that, A pair of wheel pulleys are respectively arranged in the lower part of the first elevator car and the second elevator car, so that the rope rotates vertically on the outer side of the first elevator car to the third elevator car and horizontally at the bottom. The arrangement direction of the wheel pulley pair of the first elevator car intersects the arrangement direction of the wheel pulley pair of the second elevator car when projected onto the horizontal plane. A pulley is provided on the roof of the third elevator car in such a way that the ropes of the third elevator car will not interfere with the ropes of the first elevator car and the second elevator car.

2. The elevator system according to claim 1, characterized in that, The first elevator car and the second elevator car are guided along a pair of main guide rails that extend along the elevator shaft. The pulley of the first elevator car is configured to wind a rope that extends to either the left or right of the main guide rail when viewed from the center of each car. The pulley of the second elevator car is configured to wind a rope that extends to the other side of the main guide rail when viewed from the center of each car.

3. The elevator system according to claim 2, characterized in that, The pair of main guide rails are arranged at an angle that is half the angle of the intersection of the lower wheels of the carriage.

4. The elevator system according to claim 1, characterized in that, The first elevator car and the second elevator car are operated independently and are of the same size.

5. The elevator system according to claim 1, characterized in that, The axes of the pulleys of the counterweights, which are respectively installed on the counterweights that are balanced with the first elevator car and the second elevator car, also intersect when projected onto the horizontal plane.

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