JPH0956120A - Wind-up machine for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sustain the cooling effect of cooling air and the insulation characteristics for a long term. SOLUTION: An inner cover 6 is provided on the outside of a core retainer plate 2B and an outer cover 5 is provided on the outside of the inner cover 6 while shifting the center upward. The outer cover 5 is provided, at the upper end thereof, with a suction port 5a and the inner cover 6 is provided with a flow-in port at a part slightly lower than the intermediate part. A communication pipe 19 is laid at the lower end of a stator core 3 and a duct 16a is formed between the inner cover 6 and the lower end of the outer cover 5 while communicating with a communication pipe 19. An end plate 4 is provided on the outside of a left core stopper plate 2A and an exhaust hole 14a is made thereunder. An exhaust pipe 15 is provided on the outside of the exhaust hole 14a and an exhaust fan 15a is contained in the exhaust pipe 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator hoisting machine, and more particularly to an elevator hoisting machine incorporating a motor of a forced air cooling structure.

[0002]

2. Description of the Related Art Up to recently, a DC motor was incorporated into an elevator hoisting machine, but it has been replaced by an induction motor in terms of progress in control technology and maintenance. The reason for this is that a DC motor requires a commutator and a brush that grinds, and maintenance and inspection must be performed frequently.On the other hand, due to advances in inverter technology, highly accurate speed control of induction motors with variable voltage / variable frequency control has been achieved. This is because the positioning has become possible.

Therefore, it is possible to reduce the cost, size and weight, and always achieve stable riding comfort and high landing accuracy with low power consumption. FIG. 8 is a half sectional view showing an example of a conventional elevator incorporating a squirrel cage induction motor, and FIG.
It is DD sectional drawing of.

In FIGS. 8 and 9, a pair of machine bases 1 made of H-shaped steel is fixed to a machine beam (not shown) provided horizontally in the machine room at the upper end of the elevator hoistway.
8 is L-shaped in FIG. 8 and square iron core holding plates 2A, 2 in FIG.
B is symmetrically erected and fixed to the machine base 1 with bolts.

Between these iron core pressing plates 2A and 2B,
The stator core 3 constituting the squirrel cage induction motor is fixed,
The stator winding 12 is inserted into a slot formed on the inner circumference of the stator core 3, and the coil ends of the stator winding 12 project from both sides of the stator core 3.

On the left side surface of the left iron core pressing plate 2A, an end cover 13 having a short tubular shape and a flange portion formed on the right side is fixed by a bolt. On the other hand, the iron core retainer plate 2B on the right side
An end cover 27, which is circular in the right side view of FIG. 9 and has a flange portion 27a protruding from the upper end, is fixed to the right side surface thereof by a plurality of bolts.

The flange portion 27 at the upper end of the end cover 27
A flange portion 30b formed at the lower end is fixed to the upper surface of a with bolts. An electric motor 30a is attached to the right side surface of the electric blower 30 in FIG.
A blower fan 30c is connected to the shaft end of a.

On both sides of the machine base 1, T-shaped bearing bases 8C and 8D in a side view not shown in FIG. 8 are provided upright and fixed by bolts. Of these, a bearing 7A is fixed to the upper end of the left bearing base 8C, and inside the bearing 7A,
The rolling bearing 7a is press-fitted, and bearing covers are inserted and fixed on both sides of the rolling bearing 7a.

Similarly, the same bearing 7B as the left bearing 7A is fixed to the upper end of the right bearing base 8D, and the rolling bearing 7b, which is the same product as the left rolling bearing 7a, is also provided inside this bearing 7B. It is press-fitted and fixed by the left and right bearing covers.

A rotary shaft 8 is press-fitted into these rolling bearings 7a and 7b. A rotor core 11 is press-fitted into the center of the rotary shaft 9 on the slightly left side thereof, and a plurality of cooling holes 11a are formed inside the rotor bar 11 as shown in FIG. Between the outer circumference of the rotor iron core 11 and the inner circumference of the stator iron core 3, there is formed a gap 3a through which cooling air, which will be described later, flows from the right side to the left side.

On the right side of the center of the rotary shaft 9, a sheave 10 is provided with a boss.
It is press-fitted via a key 9a which is press-fitted between the rotary shaft 9 and the shaft 10a. The upper end of the main rope 28 is wound around the outer circumference of the sheave 10, and a car 29 shown by a chain line is suspended at the lower end on one side of the main rope 28, and the other side of the main rope 28 is not shown. It hangs down the hoistway through the deflecting sheave, and a counterweight (not shown) is suspended at the lower end. On the right side of the sheave 10, the male side of the brake 20 is hung, and the female side of this brake 20 is
It is fixed to the upper surface of the machine base 1.

In the elevator hoisting machine constructed as described above, a part of the cooling air discharged from the electric blower 30 to the inside from the upper portion of the right end cover 27 as shown by an arrow E1 is shown in FIG. As indicated by an arrow E2, the air is discharged from the left end cover 13 to the outside through a space 3a formed between the inner circumference of the stator core 3 and the outer circumference of the rotor core 11.

On the other hand, the other part of the cooling air discharged into the end cover 27 is, as shown by arrows E3 and E4 in FIG. 8, from the inside of each coil end, the stator core 3 and the rotor core 3. After passing through the air gap between the end cover 13 and the cooling hole 11a to the left, and being discharged inside the left end cover 13, it is discharged to the outside.

As described above, by the cooling air flowing from the right end cover 27 to the left end cover 13, the stator core 3 and the rotor core 11 and the stator windings and the rotor windings inserted and attached to them. Are cooled below a predetermined value.

By the way, the elevator is used to carry in materials and equipment used for interior work of the building even during the completion of the building, and the hoisting machine of the elevator is also operated.

[0016]

However, in the elevator hoisting machine configured as described above, the dust generated due to the interior work of the building and rising to the machine room through the hoistway causes the electric blower 30 to move. May be inhaled.

Then, part of the dust mixed in the cooling air discharged to the end cover 27 is partially covered with the inner and outer circumferences of the void 3 and the cooling holes.
There is a risk that the inner circumference of 11a and the stator coil will adhere and accumulate. If this amount of accumulation increases, moisture may be absorbed by heating / cooling when the hoisting machine is stopped, and the creeping insulation properties of the coil may deteriorate.

On the other hand, if the amount of dust accumulated in the gap 3a or the cooling hole 11a increases, the cooling air pressure loss increases due to the reduction of the ventilation cross-sectional area, which may deteriorate the cooling effect of the stator and the rotor. . Then, the deterioration of the insulating portion of the coil is accelerated, which may shorten the life of the induction motor. Then, the objective of this invention is to obtain the elevator hoisting machine which can maintain the cooling effect and insulating property of cooling air over a long period of time.

[0019]

According to a first aspect of the present invention, there is provided an elevator hoisting machine, wherein a rotor of an induction motor and a sheave are provided on a rotary shaft penetrating a pair of bearings supported by a machine base. In an elevator hoist that air-cools a rotor and a stator in which this rotor is loosely fitted by cooling air that has been inserted and introduced into the machine, on one side of a pair of iron core pressing plates that support the stator on the machine base. On the other hand, an inner cover with an inflow port is formed in the middle lower part, and an outer cover with an intake port formed at the upper end is provided on the outer side of the inner cover eccentrically upward with respect to this inner cover. An exhaust part is provided at the bottom of the other side of the plate,
It is characterized in that it is provided with a communicating portion that communicates the inside of the lower end of the outer cover with the exhaust portion.

Further, in the elevator hoisting machine according to the second aspect of the invention, the rotor of the induction motor and the sheave are inserted and attached to the rotary shaft that is provided through a pair of bearings supported by the machine base. In an elevator hoisting machine equipped with a fan for air-cooling a rotor and a stator in which the rotor is loosely fitted, in an intermediate lower part, one side of a pair of iron core pressing plates supporting the stator on the machine base is flowed. An inner cover with an inlet is provided, and an outer cover is provided eccentrically with respect to the inner cover on the outer side of the inner cover, and an air blower is attached to the blower port at the upper end of the inner cover. An exhaust portion is provided in a lower portion, and the exhaust portion is provided with a communication portion that connects the inside of the lower end of the outer cover.

The elevator hoisting machine according to a third aspect of the invention is characterized in that an exhaust portion is provided on an end plate provided on the other side of the iron core holding plate and supporting the other side of the bearing.

Further, in the elevator hoisting machine according to a fourth aspect of the invention, the exhaust portion is provided below the stator which communicates with the inside of the second outer cover provided on the other side of the iron core holding plate. It is characterized by that.

The elevator hoisting machine according to a fifth aspect of the present invention is characterized in that the outer cover has a semicircular shape.

Furthermore, the elevator hoisting machine according to the sixth aspect of the present invention is characterized in that a separating plate is provided at the inlet of the inner cover.

By such means, among the cooling air guided from the outer cover to the inner cover, dust-containing air flows down to the lower end of the inner cover and is guided to the exhaust portion, and dust-free air is formed in the inner cover. It is guided to the inside of the induction motor from the inflow port, and then discharged to the outside from the exhaust unit.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an elevator hoist according to the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a first embodiment of an elevator hoisting machine of the present invention, which corresponds to FIG. 8 shown in the related art and corresponds to claims 1 and 3. . 2 is a cross-sectional view taken along the line AA of FIG. 1 and also corresponds to FIG. 9.

In FIGS. 1 and 2, a mirror lid 4 formed in a substantially convex shape is fixed by a bolt to the left side surface of the left iron core pressing plate 2A. An exhaust hole 4a is formed on the lower left side of the mirror cover 4. A bearing 7A is inserted and fixed in the center of the lens cover 4A. The bearing 7B on the right side is fixed by welding to the upper end of a bearing base 8B provided upright on the right end of the machine base 1.

The right outer cover 5 is slightly eccentric to the rotating shaft 9 and fixed to the right iron core pressing plate 2B. On the upper right side of the outer cover 5, a cooling air suction port 5a is formed. Inside the outer cover 5, an inner cover 6 having a smaller diameter than the outer cover 5 is provided.
It is housed coaxially with and is fixed to the iron core pressing plate 2B. The inner cover 6 is formed with cooling air inflow ports 6b on both sides of the lower part. As a result, an annular duct 16 is formed between the outer cover 5 and the inner cover 6.

On the other hand, a ventilation port 14 is formed at the lower end of the mirror lid 4 and the lower end of the iron core pressing plate 2A, and the ventilation port 14 and the left side of the exhaust hole 4a above the ventilation port 14 are formed on the lower left side surface of the mirror lid 4. Exhaust pipe 15 is provided so as to protrude from. An exhaust fan 15a is housed inside the exhaust pipe 15.

At the lower end of the stator core 3 is also attached a communication pipe 19 forming a cross section of substantially the same shape as the cross section of the vent 14.
A duct 18 is formed between the stator core 3 and the lower end surface thereof. The main rope 28 and the car 29 shown in FIG. 8 are omitted.

In the elevator hoisting machine thus constructed, when the exhaust fan 15a is rotated, cooling air is discharged from the intake port 5a formed on the upper end side surface of the right outer cover 5 as shown by an arrow B1. Inhaled.

This cooling air flows down through the duct 16 formed between the outer cover 5 and the inner cover 6 as shown by an arrow B2, and a part of the cooling air is formed in the inner cover 6 at the lower part and slightly above. 1 from the inflow port 6b to the right side of the rotor core 11 in FIG.

Then, a part of this cooling air flows into the inside of the outer cover 4 through the space 3a formed between the stator core 3 and the rotor core 11, as shown by an arrow B21, and Another part of the cooling air flows into the inside of the outer cover 4 from the cooling hole 11a formed in the rotor core 11 as shown by an arrow B31.

Further, as shown by an arrow B2, the outer cover 5
The other part of the cooling air flowing down the inside of the
4, B5, the duct 16a formed at the lower end of the duct 16 flows into the duct 18 formed on the lower side of the stator core 3 shown in FIG. 1, and further, as indicated by an arrow B6, After passing through 17, it is sucked by the exhaust fan 15a and discharged into the machine room as shown by an arrow B7.

In this cooling process, among the cooling air flowing down as shown by the arrow B2, the air containing much dust does not flow into the inner cover 6 from the inflow port 6b due to its inertia, and is shown by arrows B4, B5. So that it flows into the duct 16a.

Therefore, in the elevator hoisting machine configured as described above, the stator core 3 and the rotor core 11 are
And the cooling hole 11a of the rotor core 11 formed between
It is possible to reduce dust contained in the cooling air flowing through the air.

In the above embodiment, the inner cover 6
It is also possible to increase the area of the inflow port 6b formed in the above and to provide an air filter at this inflow port 6b to collect the fine dust contained in the cooling air flowing into the inside. In this case, since the cooling air can be further purified, there is an advantage that the insulation deterioration of the coil can be prevented for a long period of time.

The air filter is used only during the construction of the building in which the elevator is installed, and is removed when the construction is completed and dust is no longer generated, thereby reducing the pressure loss of the cooling air. It is possible to prevent an increase in temperature and power consumption due to an increase in the load of the exhaust fan 15a.

Next, FIG. 3 is a longitudinal sectional view showing a second embodiment of the elevator hoisting machine of the present invention, which corresponds to FIG.
It is a figure corresponding to claim 5. 3 is different from FIGS. 1 and 2 in that the outer cover 5A is a semicircle, and the other points are the same as those in FIGS. 1 and 2. Therefore, the same elements as those in FIG.

That is, the outer cover 5A shown in FIG.
Covers only the left half of the inner cover 6A. Therefore, the inflow port 6b is formed only on the left side of the inner cover 6A.

Also in the elevator hoisting machine constructed as described above, the cooling air sucked in as indicated by the arrow C1 from the inlet 5b formed at the upper end of the outer cover 5A is as shown by the arrow C2. The cooling air flowing down and containing dust is ducted by inertia as shown by arrows C5 and C6.
Clean cooling air that is discharged from the inside of 16a to the outside and does not contain dust flows into the inside of the inner cover 6A from the inflow port 6b as shown by arrow C3.

In this case, as compared with the elevator hoisting machine shown in FIGS. 1 and 2, when the capacity of the exhaust fan is the same, the air volume for cooling the stator core and the rotor core decreases. Therefore, it can be used for a small-sized hoisting machine or an elevator hoisting machine in a machine room where the temperature of the installation site is low in summer.

Next, FIG. 4 is a longitudinal sectional view showing a third embodiment of the elevator hoisting machine of the present invention, which corresponds to FIG. 1 and corresponds to claim 4. 4 is the same as FIG. 1 except for the positions of the exhaust port and the exhaust fan 15a and the support structure of the left bearing 7A in FIG. Therefore, the same elements as those in FIG.

That is, in FIG. 4, at the left end of the machine base 1, a bearing base 8A which is the same as the bearing base 8B erected on the right side of FIG. 1 is erected symmetrically with the right bearing base 8B. There is.
The bearing 7A is fixed to the upper end of the bearing base 8A in the same manner as the right side.

On the left side surface of the left iron core pressing plate 2A, an outer cover 4A having substantially the same outer shape as the right inner cover 6 and having an opening formed at the center is fixed by bolts.
The outer periphery of the bearing 7A is air-tightly fitted to the central opening of the outer cover 4A via a seal (not shown).

A substantially convex exhaust cover 21 is vertically provided on the lower end surface of the stator core 3, and an exhaust port is formed in the center of the lower end of the exhaust cover 21. The exhaust fan 15a is housed.

In the elevator hoisting machine constructed as described above, as the exhaust fan 15a rotates, the space between the outer cover 5 and the inner cover 6 extends from the suction port 5a formed on the upper right side of the outer cover 5. The flow path of the cooling air sucked into the duct 16 indicated by the arrows B2 and B3 is the same as in the elevator hoisting machine shown in FIG. 1, and clean air may cool the stator core 3 and the rotor core. It is the same.

The difference lies in the discharge path of the cooling air that has cooled the stator core 3 and the rotor core 11 and has flowed into the inside of the left outer cover 4A, as shown in FIG. 4, from the lower end of the outer cover 4A. A duct 18A formed by the exhaust cover 21 from a rectangular communication hole formed on the lower side of the left iron core pressing plate 2A, which has a wide left and right in a left side view (not shown).
Is inhaled inside.

The cooling air sucked into the duct 13A and the cooling air containing dust sucked from the right duct 16a are paired by the exhaust fan 15a from the exhaust port formed at the lower end of the exhaust duct 21. It is discharged between the machine bases 2.

In this case, since the flow path from the duct 16a on the right side to the duct 18A is short and the pressure loss can be reduced, the suction force of the cooling air containing dust is taken up by the elevator hoist shown in FIG. The air volume for cooling the stator core 3 and the rotor core 11 is reduced compared to the machine, but there is an advantage that the cleanliness of the cooling air can be increased.

Next, FIG. 5 is a vertical sectional view showing a fourth embodiment of the elevator hoisting machine of the present invention, which corresponds to FIGS. 1 and 4 and corresponds to claims 2 and 3. It is a figure. FIG.
In FIG. 1, the difference from FIG. 1 and FIG. 4 is that, instead of the exhaust fan, the electric blower 30 for suction is installed at the upper end of the outer cover 5A as in FIG. Is almost the same as in FIG. Therefore, FIG.
The same elements as those in FIG.

That is, the right outer cover 5A is shown in FIG.
And the outer shape is the same as the outer cover 5 shown in FIG. 4,
There is no suction port 5a formed on the upper right side, but instead an opening is formed at the upper end.

A flange (not shown) is hermetically welded to the upper surface of this opening, and a plurality of bolt holes are formed in this flange. The electric blower 30 has an outer cover 5A.
It is fixed to the upper surface of the flange at the upper end of the via a packing (not shown).

In the elevator hoisting machine thus constructed, the discharge path of the cooling air sent from the electric blower 30 into the duct 16 is the same as that of the elevator hoisting machine shown in FIG. . However, as shown in FIG.
The pressure loss is larger than that of the elevator hoist. Therefore, like the elevator hoisting machine shown in FIG. 3, it is suitable for a small hoisting machine having a low temperature rise and a hoisting machine installed in a machine at a place where the temperature rises particularly in summer.

FIG. 6 is a longitudinal sectional view showing a fifth embodiment of the elevator hoisting machine according to the present invention, which corresponds to FIGS. 1, 4 and 5, and corresponds to claims 2 and 4. It is a corresponding figure. 6 is different from FIG. 4 and FIG. 5 in that the exhaust fan 15a shown in FIG. 4 is not provided and the ventilation of cooling air is placed on the upper end of the outer cover 5A as in FIG.
That's what I did at 30.

That is, exhaust ports are formed on the left and right at the center of the communicating pipe 19A attached to the lower end of the stator core 3. A partition 19a is vertically provided between the left and right exhaust ports and the center of the lower end of the stator core 3.

As a result, the cooling air exhausted from the right duct 16a is discharged downward from the right side by the partition 19a, and the cooling air exhausted from the lower end of the left outer cover 4A into the communication pipe 19A is separated by the partition 19a. It is discharged downward from the left side by 19a.

In the elevator hoisting machine configured as described above, the pressure loss of the cooling air passing through the stator core 3 and the rotor iron core 11 increases as compared with the elevator hoisting machine shown in FIG. Therefore, as compared with the elevator hoisting machine shown in FIG. 8, it is suitable for a small-sized machine, especially when installed in a machine room where the temperature rise is low in summer.

Further, FIG. 7 is a longitudinal sectional view showing a sixth embodiment of the elevator hoisting machine of the present invention, which corresponds to FIGS. 1 and 3 and corresponds to claim 6. In FIG. 7, what is different from FIGS. 1, 2, 3, 4, 5, and 6 is that the inner cover 6 is formed as a path for cooling air to be guided from the outer cover 5 to the inside of the inner cover 6. This means that three separation plates 31 each having an arrow-shaped cross section are provided for the opening 6c.

In the elevator hoisting machine in which the separating plate 31 is attached to the opening 6c, the outer cover 5
Of the cooling air sucked in through the intake port 5a at the upper end of the cooling air as shown by arrows B1 and B2, the cooling air containing dust flows downward according to the blades on the outer side of the separation plate 31, and has low inertia without dust. The air flows from the lower side of the separating plate 31 to the inner cover 6
Is inhaled inside.

Therefore, the elevator hoisting machine can further prevent dust contained in the cooling air from entering the inside. In the above embodiment, a dust filter is detachably provided on the suction side of the exhaust fan 15a housed in the exhaust pipe 15 and the exhaust cover 21, and is included in the cooling air discharged inside the machine chamber. You may reduce the dust that is generated.

[0062]

As described above, according to the first aspect of the present invention,
The rotor of the induction motor and the sheave are inserted into the rotating shaft that is provided through a pair of bearings supported by the machine base, and the rotor and the stator where this rotor loosely fits with the cooling air introduced into the machine. In an elevator hoisting machine that air-cools, one side of a pair of iron core pressing plates that supports the stator on the machine base is provided with an inner cover with an inflow port formed in the middle lower part, An outer cover is provided eccentrically with respect to the inner cover and has an intake port formed at the upper end, and an exhaust portion is provided at the lower portion on the other side of the iron core holding plate, and the exhaust portion and the lower cover inside of the outer cover are communicated with each other. By providing the communication part, among the cooling air guided from the outer cover to the inner cover, dust-containing air flows down to the lower end of the inner cover and is guided to the exhaust part, and dust-free air is formed in the inner cover. Inside the induction motor from the inlet Having released from the exhaust unit after led to the outside, it is possible to obtain the elevator hoist that can be maintained over a cooling effect and the insulation characteristics of the cooling air in the long term.

According to the second aspect of the present invention, the rotor of the induction motor and the sheave are attached to the rotary shaft that penetrates through the pair of bearings supported by the machine base. In an elevator hoisting machine provided with a blower for air-cooling a stator in which a rotor is loosely fitted, an inlet is formed in an intermediate lower part with respect to one side of a pair of iron core pressing plates that support the stator on a machine base. An inner cover is provided, an outer cover is provided eccentrically upward with respect to this inner cover, and an air blower is attached to the air blower at the upper end. By providing this exhaust part and a communication part that connects the inside of the lower end of the outer cover to each other, out of the cooling air guided from the outer cover to the inner cover, the air containing dust flows down to the lower end of the inner cover and is exhausted. Lead to the part and do not contain dust Air was introduced into the induction motor from the inlet formed in the inner cover and then discharged from the exhaust section to the outside, so that the cooling effect of the cooling air and the insulation characteristics can be maintained for a long time. You can get the opportunity.

According to the third aspect of the present invention, the exhaust portion is provided on the end plate which is provided on the other side of the iron core pressing plate and supports the other side of the bearing, so that the cooling introduced from the outer cover to the inner cover is performed. Out of the air, dust-containing air is made to flow down to the lower end of the inner cover and is guided to the exhaust section, and dust-free air is guided to the inside of the induction motor from the inlet port formed in the inner cover and then to the outside from the exhaust section. Since the air is discharged, it is possible to obtain an elevator hoisting machine that can maintain the cooling effect of the cooling air and the insulating characteristics for a long period of time.

According to the fourth aspect of the invention, the exhaust portion is provided below the stator which communicates with the inside of the second outer cover provided on the other side of the iron core pressing plate. Out of the cooling air guided from the cover to the inner cover, dust-containing air flows down to the lower end of the inner cover and is guided to the exhaust section, and dust-free air flows from the inlet formed in the inner cover to the inside of the induction motor. Since the air is discharged to the outside from the exhaust portion after being guided, it is possible to obtain an elevator hoisting machine that can maintain the cooling effect of the cooling air and the insulating characteristics for a long period of time.

According to the fifth aspect of the present invention, the outer cover has a semicircular shape, so that among the cooling air guided from the outer cover to the inner cover, the dust-containing air flows down to the lower end of the inner cover. The air without dust is guided to the inside of the induction motor through the inlet formed in the inner cover and then discharged from the exhaust to the outside, so that the cooling effect of the cooling air and the insulation characteristics are maintained for a long time. An elevator hoist can be obtained that can be maintained over.

Further, according to the invention of claim 6,
By providing a separation plate for the inlet of the inner cover,
Out of the cooling air guided from the outer cover to the inner cover, dust-containing air flows down to the lower end of the inner cover and is guided to the exhaust section, and dust-free air flows from the inlet formed in the inner cover to the inside of the induction motor. Since the air is discharged from the exhaust part to the outside after being guided to, it is possible to obtain an elevator hoisting machine that can maintain the cooling effect and the insulating property of the cooling air for a long period of time.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a first embodiment of an elevator hoisting machine according to the present invention and is a view corresponding to claims 1 and 3. FIG.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a vertical cross-sectional view showing a second embodiment of the elevator hoisting machine of the present invention, and is a view corresponding to claim 5;

FIG. 4 is a vertical cross-sectional view showing a third embodiment of the elevator hoisting machine of the present invention, and a view corresponding to claim 4;

FIG. 5 is a vertical cross-sectional view showing a fourth embodiment of an elevator hoisting machine of the present invention, and a view corresponding to claims 2 and 3;

FIG. 6 is a vertical cross-sectional view showing a fifth embodiment of the elevator hoisting machine of the present invention, and a view corresponding to claim 4;

FIG. 7 is a vertical cross-sectional view showing a sixth embodiment of the elevator hoisting machine of the present invention, and a view corresponding to claim 6;

FIG. 8 is a vertical sectional view showing an embodiment of a conventional elevator hoisting machine.

9 is a cross-sectional view taken along line DD of FIG.

[Explanation of symbols]

1 ... Machine stand, 2A, 2B ... Iron core retainer plate, 3 ... Stator, 3a
... Void, 4 ... End plate, 4a ... Exhaust hole, 4A, 5, 5A ... Outer cover, 5a ... Suction port, 6 ... Inner cover, 7A, 7B
... Bearing, 8A, 8B ... Bearing base, 9 ... Rotating shaft, 10 ... Shea,
11 ... Rotor core, 12 ... Stator winding, 14 ... Ventilation port, 15 ... Exhaust pipe, 16, 17, 18, 18A ... Duct, 19, 19A ... Communication pipe,
30 ... Blower fan.

Claims (6)

[Claims] 1. A rotor of an induction motor and a sheave are attached to a rotary shaft penetrating a pair of bearings supported by a machine base, and the rotor and the rotor are cooled by cooling air introduced into the machine. In an elevator hoist that air-cools the stator where
An inner cover provided on one side of a pair of iron core pressing plates for supporting the stator on the machine base and having an inflow port formed in an intermediate lower portion, and provided on the outside of the inner cover eccentrically upward with respect to the inner cover. An elevator having an outer cover having a suction port formed at an upper end thereof, an exhaust portion provided at a lower portion on the other side of the iron core pressing plate, and a communicating portion communicating between the exhaust portion and a lower inner side of the outer cover. Hoisting machine. 2. A rotor of an induction motor and a sheave are inserted into a rotary shaft penetrating a pair of bearings supported by a machine base, and the rotor and a stator into which the rotor is loosely fitted are air-cooled. In an elevator hoisting machine provided with a blower, an inner cover provided on one side of a pair of iron core pressing plates supporting the stator on the machine base, and an inner cover having an inflow port formed in the middle lower part, and this inner cover An outer cover provided eccentrically with respect to the inner cover on the outer side and having the blower attached to a blower port at an upper end, an exhaust unit provided on a lower portion on the other side of the iron core pressing plate, and the exhaust unit. A hoisting machine for an elevator, comprising: a communicating portion that communicates with the inside of the lower end of the outer cover. 3. The elevator winding according to claim 1, wherein the exhaust portion is provided on an end plate that is provided on the other side of the iron core pressing plate and supports the other side of the bearing. Good machine. 4. The apparatus according to claim 1, wherein the exhaust unit is provided on a lower side of the stator that communicates with an inside of a second outer cover provided on the other side of the iron core pressing plate. Two
Elevator hoisting machine described in. 5. The elevator hoisting machine according to claim 1, wherein the outer cover has a semicircular shape. 6. The elevator hoisting machine according to claim 1, wherein a separating plate is provided at an inlet of the inner cover.