Technical Field
[0001] The present invention relates to a driving device for an elevator installed on the
bottom part of a hoistway, and more particularly to a waterproof structure thereof.
Background Art .
[0002] Fig. 11 is a structural view showing one example of a conventional elevator in which
a rope is deployed. Fig. 12 is a structural view showing an enlarged bottom part of
the hoistway of Fig. 11 and showing a state where the car is lowered to a lowermost
descending position thereof.
[0003] In the figures, a hoisting machine 2 is disposed in the bottom part 1a of the hoistway
1. The hoisting machine 2 includes a motor 2, a traction sheave 4 rotated by the motor
3, and a brake device 5. The hoisting machine 2 is entirely covered with a waterproof
cover 6. The intermediate part of a rope 9 for suspending the car 7 and a counterweight
8 in the hoistway 1 is wound around the traction sheave 4. The waterproof cover 6
is provided with an opening part 6a for leading out the rope 9.
[0004] Both ends of the rope 9 are fixed at the upper part of the hoistway 1. Further, the
rope 9 is wound around first and second return pulleys 10 and 11 provided at the upper
part of the hoistway 1.
[0005] In such a conventional elevator as described above, since the hoisting machine 2
is covered with the waterproof cover 6, even when the bottom part 1a of the hoistway
1 is submerged under water during a flood or the like, the hoisting machine 2 is not
immediately submerged in water. However, if the water level exceeds the height of
the opening part 6a provided in the waterproof cover 6, water will even enter into
the waterproof cover 6.
[0006] Fig. 12 shows a state where the car 7 is lowered to a lowermost descending position
thereof (a state where the car is lowered below a lowermost floor and runs into a
buffer (not shown) and stops). In this state, assuming that the height from the bottom
surface of the hoistway 1 to the bottom surface of the car 7 is H and the clearance
required between the car 7 and the opening part 6a of the waterproof cover 6 at that
time is g, the height h1 from the bottom surface of the hoistway 1 to the opening
part 6a of the waterproof cover 6 is expressed by H1 = H-g. In other words, when the
bottom part 1a of the hoistway 1 is submerged in water, if the height of the water
surface is located within the range of h1, the hoisting machine 2 will not be submerged
under water, so that damage can be avoided.
[0007] However, since the above-described waterproof cover 6 serves to cover the entire
part of the hoisting machine 2, both its size and weight are increased. Therefore,
the maintenance space at the bottom part 1a of the hoistway 1 is restricted, hence,
much considerable effort is needed to attach/detach or move the waterproof cover 6.
[0008] Further, since the motor 3 is surrounded by the waterproof cover 6, sufficient heat
radiation cannot be achieved, making high temperatures easily achievable. Thus, countermeasures
such as using a motor 3 with high rated output to suppress the rise in temperature
or increasing the insulating degree of the windings have been required. However, these
have merely been factors to increase the size or the cost of the motor 3.
[0009] Still further, the entry of water can only be prevented when the water level is not
higher than the height h1 of the opening part 6a of the waterproof cover 6.
[0010] Japanese Utility Model Application Laid-open No.
Sho 63-45761 discloses an elevator in which a waterproof case is provided on the bottom part of
a hoistway and a buffer is provided in the waterproof case. However, in this elevator,
the hoisting machine is installed in a machine room at an upper part of the hoistway
and no waterproof structure for the hoisting machine is disclosed therein.
[0011] Further, Japanese Utility Model Application Laid-open No.
Sho 58-92269 discloses an elevator in which the hoisting machine is disposed on the bottom part
of a hoistway and the motor and controller are arranged at positions higher than the
sheave of the hoisting machine. However, according to this countermeasure, the hoisting
machine will be submerged in water at a water level lower than that when the waterproof
cover 6 shown in Fig.12 is employed.
Disclosure of the Invention
[0012] The present invention has been made in order to solve the above-described problems,
and therefore has an object to provide a driving device for an elevator which can
ensure a wide space on the bottom part of a hoistway by decreasing the size and weight
of a waterproof cover, and in which the motor will have good heat radiation characteristics
and the hoisting machine is not submerged under water even when water reaches a higher
position.
[0013] The driving device for an elevator according to the present invention is comprised
of: a waterproof motor including a motor main body having a rotor in a frame and a
motor shaft rotated by the motor main body, disposed on the bottom part of a hoistway;
a traction sheave attached to the motor shaft, around which a rope for elevating and
lowering a car is wound; and a brake device for braking the rotation of the motor
shaft, wherein waterproof covers for covering the traction sheave and the brake device
are attached to the motor main body so as to leave the frame exposed.
Brief Description of the Drawings
[0014]
Fig. 1 is a frontal view showing a driving device for an elevator according to Embodiment
1 of the present invention;
Fig. 2 is a plan view showing the driving device for an elevator of Fig. 1;
Fig. 3 is a frontal view showing a car at a lowermost position, compressing the waterproof
cover for a rope, shown in Fig. 1;
Fig. 4 is a frontal view showing a driving device for an elevator according to Embodiment
2 of the present invention;
Fig. 5 is a frontal view showing the main parts of the waterproof cover for a rope
of the driving device for an elevator according to Embodiment 3 of the present invention;
Fig. 6 is a plan view showing the waterproof cover for the rope shown in Fig. 5;
Fig. 7 is a side view showing the waterproof cover for the rope shown in Fig. 5;
Fig. 8 is a frontal view showing a driving device for an elevator according to Embodiment
4 of the present invention;
Fig. 9 is a circuit diagram showing an electric circuit including the heat generating
member shown in Fig. 8;
Fig. 10 is an exploded perspective view showing main parts of a driving device for
an elevator according to a fifth embodiment of the present invention;
Fig. 11 is a structural view showing one example of a conventional elevator with a
rope deplayed; and
Fig. 12 is a structural view showing the expanded bottom part of the hoistway shown
in Fig. 11.
Best Modes for Carrying Out the Invention
[0015] Now, preferred embodiments of the present invention will be described with reference
to the drawings.
Embodiment 1
[0016] Fig. 1 is a frontal view showing a driving device for an elevator according to Embodiment
1 of the present invention. Fig. 2 is a plan view showing the driving device for an
elevator shown in Fig. 1. Fig. 3 is a frontal view showing a car at a lowermost position,
compressing the waterproof cover for a rope, shown in Fig. 1. In this case, the entire
configuration of the elevator is the same as in Fig.11 except for the driving device.
[0017] Referring to the drawings, a base 21 is disposed on the bottom part 1a of a hoistway
1. A hoisting machine 22 for elevating and lowering a car 7 is disposed on the base
21. The hoisting machine 22 has a waterproof motor 23, a traction sheave 24, and a
brake device 25.
[0018] The waterproof motor 23 includes a motor main body 23a provided with a rotor and
a winding or the like in a frame, and a motor shaft 23b rotated by the motor main
body 23a. The traction sheave 24 is fixed to the motor shaft 23b and a rope 9 for
elevating and lowering the car 7 is wound around the traction sheave from an upper
part thereof. The brake device 25 is connected to an end part in an axial direction
of the motor 23 opposite to the traction sheave 24 to brake the rotation of the motor
shaft 23b.
[0019] To one end face in the axial direction of the motor main body 23a, a waterproof cover
26 for a sheave made of steel plate, for covering the traction sheave 24 is tightly
affixed. The waterproof cover 26 for the sheave is provided with an openable inspection
window 27. To the other end face in the axial direction of the motor main body 23a,
a waterproof cover 28 made of steel plate for covering the brake device 25 is tightly
affixed. These waterproof covers 26 and 28 may also be made of plastic. In this case,
all or a part of the waterproof-covers 26 and 28 may be transparent. Further, the
frame of the motor 23 is not covered with the waterproof covers 26 and 28, and is
exposed in the hoistway 1.
[0020] To an upper part of the waterproof cover 26, a tubular waterproof cover 29 for the
rope for surrounding the rope leading-out from the waterproof cover 26 for the sheave
is connected. The waterproof cover 29 for the rope has a bellows structure stretchable
in the direction of elevation of the car 7.
[0021] In the above-described driving device for the elevator, the motor main body 23a has
a waterproof structure, the whole motor 23 need not be covered with a waterproof cover
and only the traction sheave 24 and the brake device 25 are respectively covered with
the separate waterproof covers 26 and 28. Thus, the all of the waterproof covers 26,
28 and 29 can be made compact and sufficient maintenance work space for the bottom
part 1a of the hoistway 1 can be ensured. Further, since the individual waterproof
covers 26, 28 and 29 are small and light, attaching and detaching them are greatly
facilitated.
[0022] Still further, since the motor 23 is not surrounded with a waterproof cover, the
heat radiation characteristics of the motor 23 are good and the size and cost of the
motor 23 can be kept from increasing.
[0023] Still further, even when the car 7 is lowered to its lowermost position as shown
in Fig. 3, the waterproof cover 29 for the rope is not broken, but only compressed.
Accordingly, height h2 from the bottom surface of the hoistway 1 to the upper end
part of the waterproof cover 29 for the rope, that is to say, the water level at which
the hoisting machine 22 is submerged in water can be made higher than the height h1
in the conventional example.
[0024] Furthermore, either the inspection window 27 or the waterproof covers 26 and 28 composed
of transparent plastic are provided. Accordingly, inspections can be carried out without
removing the waterproof covers 26 and 28 so that workability is improved. The inspection
window alone may also be made transparent.
[0025] Note that, in Embodiment 1, although the waterproof cover 29 for the rope having
the bellows structure is used, where the waterproof cover for the rope does not interfere
with the car 7, a bellows structure need not be employed.
Embodiment 2
[0026] According to Embodiment 1, although the traction sheave 24 is arranged at one end
part of the motor 23 and the brake device 25 is arranged at the other end thereof
respectively, as shown in Fig. 4, the traction sheave 24 and the brake device 25 may
both be arranged at one end part of the motor 23. Here, the traction sheave 24 and
the brake device 25 may also be covered with one waterproof cover 40.
Embodiment 3
[0027] Fig. 5 is a frontal view showing main parts of a waterproof cover for a rope of a
driving device for an elevator according to Embodiment 3 of the present invention,
Fig. 6 is a plan view showing the waterproof cover for the rope shown in Fig. 5, and
Fig. 7 is a side view showing the waterproof cover for the rope shown in Fig. 5.
[0028] In this embodiment, a pair of rollers 30 and a pair of slide plates 31 serving as
rope protecting members for preventing damage to rope 9 due to contact with the waterproof
cover 29 are provided inside the waterproof cover 29. Other configurations are equal
to those of Embodiment 1.
[0029] In such a driving device for an elevator as described above, for example, even where
the waterproof cover 26 for a sheave is inclined, the rope 9 does not directly come
into contact with the waterproof cover 29 for the rope, so that the rope 9 or the
waterproof cover 29 for the rope can be prevented.
Embodiment 4
[0030] Fig. 8 is a frontal view showing a driving device for an elevator according to Embodiment
4 of the present invention, and Fig. 9 is a circuit diagram showing an electric circuit
including the heat generating member shown in Fig. 8.
[0031] In the figures, the heat generating member 32 that generates heat upon turning on
power is provided in a waterproof cover 26 for a sheave. A power source 33 and a switch
34 are connected to the heat generating member 32. Other configurations are equal
to those of Embodiment 1.
[0032] Generally, since most of the bottom parts 1a of hoistways 1 are provided below ground
level, humidity frequently becomes high. Accordingly, vapor condensation is liable
to be generate in the inner part of the waterproof cover 26 for the sheave. However,
when the inner part of the waterproof cover 26 for the sheave is heated and dried
by the heat generating body 32, the inner part of the waterproof cover 26 for the
sheave can be kept from corroding due to the vapor condensation.
Embodiment 5
[0033] Fig. 10 is an exploded perspective view showing main parts of a driving device for
an elevator according to Embodiment 5 of the present invention. It is an object of
Embodiment 5 to reduce manufacturing costs to lower than that of the configuration
shown in Embodiment 1.
[0034] In Fig. 10, in an axial end part of a motor main body 23a, an attaching part 23c
for attaching a brake device 25 is provided. Further, in the axial end face 23d of
the motor main body 23a, a plurality of screw holes 23e are provided. A pair of circular
arc shaped adapter plates 34a and 34b which are combined with each other to form one
ring are connected to the axial end face 23d of the motor main body 23a through a
silicone sealing material 41, and fixed to the motor main body 23a through a plurality
of screws 35.
[0035] The adapter plates 34a and 34b are provided with a plurality of through holes 34c
through which the screws 35 pass. Further, in the outer sides of the holes 34c of
the adapter plates 34a and 34b, a plurality of screw holes 34d are provided.
[0036] To the adapter plates 34a and 34b, a waterproof cover 28 for a brake is tightly fixed
through a ring-shaped rubber packing 36. In the rubber packing 36 and the waterproof
cover 28 for the brake, a plurality of through holes 36a and 28a corresponding to
the screw holes 34d are respectively provided. The waterproof cover 28 for the brake
and the rubber packing 36 are fixed to the adapter plates 34a and 34b through a plurality
of screws 37 screwed to the screw holes 34d through the through holes 36a and 28a.
Other configurations are the same as those of Embodiment 1.
[0037] Usually, the outer peripheral part of the motor main body 23a is formed with a casting
and machine work is abbreviated at the axial end face 23d of the brake device 25 side
so that a casting skin remains therein. This is because the attaching part 23c for
attaching the brake device 25 interferes with the machine work. Therefore, even when
the waterproof cover 28 for the brake is directly attached to the motor main body
23a, there is a fear that gaps clearances may be generated, allowing water to enter.
[0038] On the contrary, according to Embodiment 5, the waterproof cover 28 for the brake
is attached to the motor main body 23a through the adapter plates 34a and 34b and
the rubber packing 36. Further, the silicon sealing material 41 is provided between
the adapter plates 34a and 34b and the motor main body 23a.
[0039] Although the silicon sealing material 41 is initially liquid, it cures over time.
Hence, the adapter plates 34a and 34b become tightly fixed to the motor main body
23a without any gaps. The surfaces of the adapter plates 34a and 34b are smoothly
machined and the adapter plates 34a and 34b are tightly connected to the waterproof
cover 28 for the brake through the rubber packing 36 so that the entry of water is
prevented.
[0040] According to the above-described attaching structure of the waterproof cover 28 for
the brake, even when the axial end face 23d of the motor main body 23a is not machined,
the entry of water can be assuredly prevented, thereby allowing a reduction of production
costs.
[0041] In Embodiment 5, although the attaching structure of the waterproof cover 28 for
the brake is described, such an attaching structure can be also applied to the waterproof
cover 26 side for a sheave.
1. A driving device for an elevator, comprising:
a waterproof motor (23) including a motor main body (23a) having a rotor in a frame
and a motor shaft (23b) rotated by the motor main body (23a), disposed on the bottom
part (1a) of a hoistway (1);
a traction sheave (24) attached to the motor shaft (23b), around which a rope (9)
for elevating and lowering a car (7) is wound; and
a brake device (25) for braking the rotation of the motor shaft (23b), characterized in that waterproof covers (26), (28) for covering the traction sheave (24) and the brake
device (25) are attached to the motor main body (23a) so as to leave the frame exposed.
2. A driving device for an elevator as set forth in claim 1, wherein the waterproof covers
include a waterproof cover (26) for a sheave for covering the traction sheave (24)
and a waterproof cover (28) for a brake for covering the brake device (25).
3. A driving device for an elevator as set forth in claim 2, wherein a heat generating
member (32) for heating and drying the waterproof cover (26) for the sheave is provided
in the waterproof cover (26) for the sheave.
4. A driving device for an elevator as set forth in claim 1, wherein at least a part
of the waterproof covers (26), (28) is transparent.
5. A driving device for an elevator as set forth in claim 1, wherein an inspection window
(27) is provided in each of the waterproof covers (26), (28).
6. A driving device for an elevator as set forth in claim 1, wherein at least one of
the waterproof covers (26), (28) is connected to the motor main body (23a) through
adapter plates (34a), (34b) tightly fixed to the outer circumferential surface of
the motor main body (23a) through a sealing material (41) and a rubber packing (36)
joining to the adapter plates (34a), (34b).
7. A driving device for an elevator as set forth in claim 1, further comprising a tubular
waterproof cover (29) for a rope, connected to a rope leading-out portion of the waterproof
cover (26) and for surrounding the leading-out part of the rope (9).
8. A driving device for an elevator as set forth in claim 7, wherein the waterproof cover
(29) for the rope has a bellows structure stretchable in a direction for elevating
the car (7), and used in an expanded state during ordinary operation to be compressed
by the car (7) when the car (7) is lowered to a lowermost position thereof.
9. A driving device for an elevator as set forth in claim 7, wherein rope protecting
members (30), (31) for preventing damage to the rope (9) due to contact with the waterproof
cover (29) for the rope are provided inside the waterproof cover (29) for the rope.
1. Antriebseinrichtung für einen Aufzug, umfassend:
einen wasserfesten Motor (23) umfassend einen Motorhauptkörper (23a), der einen Rotor
in einem Rahmen und eine Motorwelle (23b)aufweist, die mittels des Motorhauptkörpers
(23a) gedreht wird, der an einem Bodenteil (1a) eines Aufzugschachts (1) angeordnet
ist;
eine an der Motorwelle (23b) angebrachte Kraftschlusshülle (24), um die ein Seil (9)
zum Anheben und Absenken einer Kabine (7) gewickelt ist; und
eine Bremseinrichtung (25) zum Bremsen der Rotation der Motorwelle (23b),
dadurch gekennzeichnet, dass wasserfeste Abdeckungen (26), (28) zum Abdecken der Kraftschlusshülle (24) und der
Bremseinrichtung (25) an dem Motorhauptkörper (23a) angebracht sind, so dass sie den
Rahmen freigelegt lassen.
2. Antriebseinrichtung für einen Aufzug nach Anspruch 1, bei dem die wasserfesten Abdeckungen
eine wasserfeste Abdeckung (26) für eine Hülle zum Abdecken der Kraftschlusshülle
(24) und eine wasserfeste Abdeckung (28) für eine Bremse zum Abdecken der Bremseinrichtung
(25) umfassen.
3. Antriebseinrichtung für einen Aufzug nach Anspruch 2, bei dem in der wasserfesten
Abdeckung (26) für die Hülle ein Hitze erzeugendes Element (32) zum Heizen und Trocknen
der wasserfesten Abdeckung (26) für die Hülle vorgesehen ist.
4. Antriebseinrichtung für einen Aufzug nach Anspruch 1, bei dem zumindest ein Teil der
wasserfesten Abdeckungen (26), (28) transparent ist.
5. Antriebseinrichtung für einen Aufzug nach Anspruch 1, bei dem ein Inspektionsfenster
(27) in jeder der wasserfesten Abdeckungen (26), (28) vorgesehen ist.
6. Antriebseinrichtung für einen Aufzug nach Anspruch 1, bei dem zumindest eine der wasserfesten
Abdeckungen (26), (28) mit dem Motorhauptkörper (23a) durch Adapterplatten (34a),
(34b) verbunden ist, die fest an der äußeren Umfangsoberfläche des Motorhauptkörpers
(23a) durch ein versiegelndes Material (41) und eine Gummipackung (36), die die Adapterplatten
(34a), (34b) verbinden, befestigt sind.
7. Antriebseinrichtung für einen Aufzug nach Anspruch 1, ferner umfassend eine rohrförmige
wasserfeste Abdeckung (29) für ein Seil, die mit einem Seilausführabschnitt der wasserfesten
Abdeckung (26) verbunden ist und die den Seilausführabschnitt des Seils (9) umgibt.
8. Antriebseinrichtung für einen Aufzug nach Anspruch 7, bei dem die wasserfeste Abdeckung
(29) für das Seil eine Balgstruktur aufweist, welche in Richtung zum Anheben der Kabine
(7) dehnbar ist, und die in einem ausgedehnten Zustand während des normalen Betriebs
durch die Kabine (7) zusammengedrückt wird, wenn die Kabine (7) in ihre niedrigste
Position abgesenkt wird.
9. Antriebseinrichtung für einen Aufzug nach Anspruch 7, bei dem Seilschutzelemente (30),
(31) zum Verhindern von Schäden an dem Seil (9) aufgrund von Kontakt mit der wasserfesten
Abdeckung (29) für das Seil innerhalb der wasserfesten Abdeckung (29) für das Seil
vorgesehen sind.
1. Dispositif de commande destiné à un ascenseur, comprenant :
un moteur étanche (23) comprenant un corps principal de moteur (23a) comportant un
rotor disposé dans un châssis et un arbre de moteur (23b) mis en rotation par le corps
principal de moteur (23a), disposé sur la partie d'embase (1a) d'un appareil de levage
(1) ;
une poulie motrice à gorge (24) fixée sur l'arbre de moteur (23b) autour de laquelle
est enroulé un câble (9) destiné à élever et à abaisser une cabine (7) ; et
un dispositif de freinage (25) destiné à freiner la rotation de l'arbre de moteur
(23b),
caractérisé en ce que des capots étanches (26), (28) destinés à recouvrir la poulie motrice à gorge (24)
et le dispositif de freinage (25) sont fixés sur le corps principal de moteur (23a)
de manière à laisser le châssis à découvert.
2. Dispositif de commande destiné à un ascenseur selon la revendication 1, dans lequel
les capots étanches se composent d'un capot étanche (26) destiné à une poulie à gorge
afin de recouvrir la poulie motrice à gorge (24) et d'un capot étanche (28) destiné
à un frein afin de recouvrir le dispositif de freinage (25).
3. Dispositif de commande destiné à un ascenseur selon la revendication 2, dans lequel
un élément générateur de chaleur (32) destiné à chauffer et à sécher le capot étanche
(26) destiné à la poulie à gorge est aménagé dans le capot étanche (26) destiné à
la poulie à gorge.
4. Dispositif de commande destiné à un ascenseur selon la revendication 1, dans lequel
au moins une partie des capots étanches (26), (28) est transparente.
5. Dispositif de commande destiné à un ascenseur selon la revendication 1, dans lequel
une fenêtre d'inspection (27) est aménagée dans chacun des capots étanches (26), (28).
6. Dispositif de commande destiné à un ascenseur selon la revendication 1, dans lequel
au moins l'un des capots étanches (26), (28) est connecté au corps principal de moteur
(23a) par l'intermédiaire de plaques d'adaptation (34a), (34b) solidement fixées sur
la surface de circonférence externe du corps principal de moteur (23a) par l'intermédiaire
d'un matériau d'étanchéité (41) et d'un ensemble en caoutchouc (36) qui sont connectés
aux plaques d'adaptation (34a), (34b).
7. Dispositif de commande destiné à un ascenseur selon la revendication 1, comprenant
en outre un capot étanche tubulaire (29) destiné à un câble, connecté à une partie
de sortie de câble du capot étanche (26) et destiné à entourer la partie de sortie
du câble (9).
8. Dispositif de commande destiné à un ascenseur selon la revendication 7, dans lequel
le capot étanche (29) destiné au câble comprend une structure à soufflets qui peut
s'étende dans une direction permettant une élévation de la cabine (7), et qui est
utilisée dans un état d'extension au cours d'une opération normale dans laquelle il
doit être comprimé par la cabine (7) lorsque la cabine (7) est abaissée jusqu'à sa
position la plus basse.
9. Dispositif de commande destiné à un ascenseur selon la revendication 7, dans lequel
des éléments de protection de câble (30), (31) destinés à empêcher une détérioration
du câble (9), qui pourrait résulter d'un contact avec le capot étanche (29) destiné
au câble, sont aménagés à l'intérieur du capot étanche (29) destiné au câble.