JPH05115152A - Outdoor open type electric rotating machine - Google Patents

Abstract

PURPOSE:To prolong service life of air filter and to facilitate maintenance by disposing a plurality of board heaters on the inside at the suction port of wind tunnel thereby protecting the interior of stator frame against corrosion or degradation of insulation. CONSTITUTION:A plurality of board heaters 4 are disposed in zigzag below an air filter 3, fixed dismountably from the outer peripheral side of a wind tunnel 2, on the upper peripheral side of a partition 11 provided at the lower section of the wind tunnel 2. Consequently, when cooling air 15A is sucked through a suction port 9 into the wind tunnel 2 and passes between the board heaters 4 while snaking, it is heated by about 5-10 deg.C through the board heaters 4 and sucked into a stator frame 1 through the air filter 3. Salts contained in the cooling air 15B, snaking through the board heaters 4, are deposited at the corners of the board heaters 4 before the cooling air 15B enters into the air filter 3. Consequently, salts adhering to the air filter can be reduced, interval between cloggings of the air filter due to deliquescence can be prolonged, and thereby exchanging interval of the air filter can be prolonged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outdoor open type electric rotating machine which is cooled by cooling air containing salt.

[0002]

2. Description of the Related Art In FIG. 2, which shows an example of a vertical outdoor open type electric motor for driving a pump of a power plant constructed near a coast, a rotor shaft 5 is vertically mounted on a bearing 1a of a stator frame 1. A wind tunnel 2 is attached to the outside of the stator frame 1 so as to penetrate therethrough. Of these, a rotor core 6A is press-fitted into the rotor shaft 5, and the rotor core 6A is provided with a cooling hole 6a penetrating from the inner circumference to the outer circumference.

A stator core 6B is fixed to the inner periphery of the center of the stator frame 1, and a plurality of cooling holes 6b penetrating from the inner periphery to the outer periphery are provided in the stator core 6B, and the stator winding The wire 7 is fixed in a groove (not shown). An intake port 14A is provided on the lower right side of the outer periphery of the stator frame 1, and an exhaust port 14B is provided on the upper right side of the outer periphery of the stator frame 1, symmetrically with the intake port 14A, on the upper side of the rotor shaft 5. Is equipped with an inner fan 8 for discharging the cooling air inside.

A partition 12 for partitioning the wind tunnel 2 into upper and lower portions is provided at the center of the wind tunnel 2, and at the lower portion of the wind tunnel 2 is the wind tunnel 2.
A partition 11 for partitioning the lower part of the wind tunnel 2 into the inside and the outside is provided upright, and a partition 13 for partitioning the upper part of the wind tunnel 2 into the inside and the outside is also provided above the wind tunnel 2. An intake port 9 is provided on the outer peripheral side of the partition 11 at the lower part of the wind tunnel 2, and an exhaust port 10 is provided on the outer peripheral side of the partition 13 at the upper part of the wind tunnel 2 symmetrically with the intake port 9. .. Of these, an air filter 3 that collects salt contained in the cooling air sucked from the intake port 9 is detachably attached from the outer peripheral side of the wind tunnel 2 above the intake port 9.

In the outdoor open-type electric motor constructed as described above, the cooling air which is sucked by the inner fan 8 and flows into the lower portion of the wind tunnel 2 from the intake port 9 as shown by an arrow 15A is for removing salt. After the salt is removed by the air filter 3, it is inverted into an inverted U shape as shown by an arrow 15C and flows into the lower part of the stator frame 1 from the intake port 14A as shown by an arrow 15D. Then, this cooling air cools the stator winding 7 protruding downward and flows into the inner circumference of the rotor core 6A as indicated by an arrow 15E, and then the cooling hole 6a provided in the rotor core 6A. When the rotor core 6A and the rotor winding (not shown) are cooled, the rotor core 6A and the rotor winding are cooled.

The cooling air flowing to the outer circumference of the rotor core 6A flows through the cooling holes 6b of the stator core 6B and then to the outer circumference of the stator core 6B as indicated by an arrow 15F, whereby the stator core 6B is cooled. After being cooled, it flows out upward as shown by an arrow 15G and is discharged by the inner fan 8 from the exhaust port 14B to the upper part of the wind tunnel 2 as shown by an arrow 15H. Next, as shown by an arrow 15J, the lower part of the partition 13 is bent in a U shape, and is discharged from the exhaust port 10 as shown by an arrow 15K.

[0007]

However, the outdoor open type electric motor constructed as described above and cooled by directly sucking the outside air at the power plant constructed near the coast contains salt in the summer. Cooling hole 6 by sucking cooling air
At the corners on the axial center side of a and 6b, salt contained in the water content of the cooling air is crystallized and precipitated by the heat of the rotor core 6A and the stator core 6B whose temperature has risen to about 150 ° C, and the salt is contained for a long time. The amount increases during operation and not only corrodes the rotor core 6A and the stator core 6B, but also attacks the insulating coating on the surface of the rotor winding and the stator winding 7, resulting in poor insulation between the winding and the iron core. There is also a risk of causing.

Therefore, as described above, the wind tunnel 2 has
An air filter 3 for salt removal is provided immediately after the intake port 9. This air filter 3 also clogs in a short time due to the deliquescent phenomenon of sea salt particles contained in the cooling air, and the pressure of the cooling air is reduced. Since the loss increases and the internal temperature rises, it has to be replaced within about one month in summer, especially when using a filter medium having a high salt removal rate. Therefore, an object of the present invention is to provide an outdoor open type electric rotating machine that is easy to maintain and can prevent internal corrosion and insulation deterioration.

[0009]

SUMMARY OF THE INVENTION The present invention relates to an outdoor open type rotary electric machine provided with a wind tunnel for sucking in and discharging cooling air for cooling the inside of a stator frame. By installing multiple plate-shaped heaters inside the stator frame, salt contained in the cooling air sent into the stator frame is deposited by the plate-shaped heater to prevent corrosion and insulation deterioration inside the stator frame. This is an outdoor open-type rotating electric machine that extends the life of the filter and facilitates maintenance.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an outdoor open type rotating electric machine of the present invention will be described below with reference to the drawings. However, the same parts as those in FIG. FIG. 1 is a vertical half sectional view showing an outdoor open type rotating electric machine of the present invention.

In FIG. 1, a plurality of plate heaters 4 are arranged below an air filter 3 which is detachably attached to the outer periphery of the wind tunnel 2 on the outer periphery of the upper partition 11 of the wind tunnel 2. The plate-shaped heaters 4 are arranged in a staggered pattern, and the cooling air passing through the plate-shaped heaters 4 as indicated by an arrow 15B is about 5 ° C. at the plate-shaped heaters 4.
The shape, arrangement, and temperature are set so that the temperature is increased by 10 ° C.

In the outdoor open type rotating electric machine configured as described above, the wind tunnel 2 is drawn from the intake port 9 as shown by an arrow 15A.
After being meandered between the plate-shaped heaters 4, the cooling wind sucked into the inside of the stator passes through the air filter 3 for salt removal in the same manner as in the conventional case and is sucked into the inside of the stator frame 1. Moisture contained in the cooling wind that meanders between the heaters 4 has a salt content deposited at the corners of the plate-shaped heater 4 and enters the air filter 3, so that the salt content attached to the air filter 3 can be reduced. Since it is possible to extend the period until clogging due to the deliquescent phenomenon in the air filter 3, it is possible to extend the replacement period of the air filter 3.

In FIG. 1 of the above-mentioned embodiment, the plate filter 4 is shown as an example in which the number of plate filters 4 is three on the lower side and two on the upper side. Partition 11
Depending on the cross-sectional area between the outer circumference and the outer circumference, the width of the plate heater 4, the rating of the inner fan 7, etc., the number of rows in the horizontal direction or the rows in the vertical direction may be 3 to 4. Further, in the above embodiment, the outdoor open type rotating electric machine is described as an example of a vertical type electric motor, but it may be a horizontal type electric motor.
Further, a generator may be used instead of the electric motor.

[0014]

As described above, according to the present invention, in the outdoor open type rotating electric machine provided with the wind tunnel for sucking in and discharging the cooling air for cooling the inside of the stator frame, a plurality of sheets are provided inside the intake port of the wind tunnel. By installing the plate heater, the salt content contained in the cooling air sent into the stator is deposited by the plate heater, preventing corrosion inside the stator frame and insulation deterioration, and increasing the life of the air filter. It is possible to obtain an outdoor open type electric rotating machine that can be extended to facilitate maintenance.

[Brief description of drawings]

FIG. 1 is a vertical half sectional view showing an embodiment of an outdoor open type rotating electric machine of the present invention.

FIG. 2 is a vertical half sectional view showing an example of a conventional outdoor open-type rotating electric machine.

[Explanation of symbols]

1 ... Stator frame, 2 ... Wind tunnel, 3 ... Air filter, 4 ... Plate heater, 6 ... Iron core, 7 ... Winding, 8 ... Inner fan, 9 ... Intake port,
10 ... Exhaust port.

Claims (1)

[Claims] 1. An outdoor open type rotating electric machine provided with a wind tunnel for sucking in and discharging cooling air for cooling the inside of a stator frame, wherein a plurality of plate heaters are provided inside an intake port of the wind tunnel. Outdoor open type rotating electrical machine characterized by