JPS6244046A - Ventilating cooling device for vertical electric motor - Google Patents

Abstract

PURPOSE:To improve the cooling effect of the lower bearing by providing a diaphram in the lower part of the stator frame so as not to leak the inner air to the outside from the lower part of the stator frame. CONSTITUTION:A diaphram 14 is provided so that the inner air will not leak to the outside from the bottom surface of a stator frame 14. In the lower part of this diaphram 14, an air room 15 is provided and a bearing box 9 is installed in the position off the internal air on the lower side of this air room 15. Furthermore, a communicating tube 16 is provided which introduces the external cooling air from outer fan 7 to the air room 15. In the air room 15 and on the outside circumference of the bearing box 9 an air outlet 17 is provided to communicate the air room 15 with outside. Thus the heat from the motor body in the lower bearing 10 is shut down and the bearing box 9 is subject to be exposed to the cooling wind from outside, by which the cooling of the lower bearing 10 is made easy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a ventilation cooling device for a vertical electric motor.

[Background of the invention]

FIG. 4 shows a conventional example of a ventilation cooling device for a vertical motor. As shown in the figure, the ventilation cooling device includes a stator frame 4 which is arranged opposite to a rotor having a rotor shaft 1 and which surrounds and supports a stator core 3 around which a stator coil 2 is wound. A heat exchanger 51 is provided on the top of the rotor shaft 1, and an external fan 7 is provided on the top of the rotor shaft 1 to introduce cooling air into the heat exchanger 5 from the outside through a wind tunnel 6. , the internal cooling air that has cooled the stator coil 2 and stator core 3 is transferred to the heat exchanger 5 and onto the stator frame 4.

It is equipped with an internal fan 8 and the like that circulate the air through a ventilation path provided at the bottom. and provided on the lower side of the rotor shaft 1,
A cooling means for cooling the lower bearing 1o housed in the bearing box 9 is also provided. In the figure, 11 is an upper bearing, 12 is an end bracket, and 13 is a bearing cover.

That is, the internal cooling air that has cooled the heat generated from the stator coils 2 and the like is passed through the heat exchanger 5 by the internal fan 8, and circulated between the upper and lower parts of the stator frame 4. Cooling air from an external fan 7 flows through the heat exchanger 5 from top to bottom through its pipes. In this way, the cooling air flows from the top to the bottom of the heat exchanger 5 to cool the inside air, so the inside air at the bottom is 10 to 20 degrees higher than that at the top.
The bearing box 9 attached to the lower frame of the is the inner air and the stator.

Since heat was transferred from the frame 4 and from the rotor shaft 1 to the lower bearing 10, the temperature rise in the lower bearing 10 was large. For this reason, a blower (not shown) or the like was separately provided to cool the lower bearing 1o, but this made the device complicated and troublesome. Incidentally, as related to this kind of thing, for example, Japanese Patent Application Laid-Open No. 59-6784
There are publications such as No. 9.

[Purpose of the invention]

The present invention has been made in view of the above points, and it is an object of the present invention to provide a ventilation cooling device for a vertical electric motor that makes it possible to easily cool the lower bearing.

[Summary of the invention]

That is, the present invention provides a heat exchanger provided in a stator frame that is arranged to face a rotor having a vertical rotor shaft and that surrounds and supports a stator core around which a stator coil is wound; an external fan provided at the top of the rotor shaft to introduce cooling air into the heat exchanger from the outside; and an external fan provided at both ends of the rotor to cool the rotor, stator coil, and stator core. an internal fan that circulates internal cooling air through the heat exchanger and ventilation passages provided above and below the stator frame, the fan being provided at the lower side of the rotor thin body and located in the bearing box; In a ventilation cooling device for a vertical motor in which a cooling means for cooling a housed lower bearing is provided, the cooling means is provided between the lower stator frame and the rotor shaft, and the cooling means is provided between the lower stator frame and the rotor shaft, and the internal cooling A partition plate that prevents wind from leaking to the outside, an air chamber provided at the bottom of the partition plate and between the bearing box, and this air chamber and the external fan communicate with each other to prevent air from leaking to the outside. It is characterized by being formed by a communication pipe that introduces external cooling air into the chamber, and an exhaust hole that is provided on the outer periphery of the air chamber and the bearing box and that communicates the air chamber with the outside, As a result, the lower bearing is shielded from heat from the motor body, and the bearing box is exposed to cooling air from the outside.

[Embodiments of the invention]

The present invention will be explained below based on the illustrated embodiments. An embodiment of the present invention is shown in FIGS. 1-3.

Note that the same parts as in the conventional one are given the same reference numerals, so the explanation is omitted. In this embodiment, a cooling means for cooling the lower bearing 10 is provided between the lower stator frame 4 and the rotor shaft 1, and A partition plate 14 that prevents internal cooling air from leaking to the outside, an air chamber 15 provided below the partition plate 14 and between the bearing box 9, and a connection between the air chamber 15 and the external fan 7. It is formed by a communication pipe 16 that communicates between the air chamber 15 and introduces external cooling air into the air chamber 15, and an exhaust hole 17 that is provided on the outer periphery of the air chamber 15 and the bearing N9 and that communicates the air chamber 15 with the outside. . The cooling means for cooling the lower bearing 10 in this manner includes a partition plate 14 that is provided between the lower stator frame 4 and the rotor shaft 1 and that prevents internal cooling air from leaking to the outside; An air chamber 15 provided at the lower part of the partition plate 14 and between the bearing M9, and a communication pipe 16 that communicates between the air chamber 15 and the external fan 7 and introduces external cooling air into the air chamber 15. , provided on the outer periphery of the air chamber 15 and the bearing box 9,
In addition, the air chamber 15 is formed with an exhaust hole 17 etc. that communicates with the outside, so that the lower bearing 10 is shielded from heat from the motor body, and the bearing box 9 is exposed to cooling air from the outside. As a result, it is possible to obtain a ventilation cooling device for a vertical motor that allows easy cooling of the lower bearing 10.

That is, a partition plate 14 is provided at the lower part of the stator frame 4 to prevent internal air from leaking to the outside from the lower surface of the stator frame 4. An air chamber 15 is provided at the bottom of this partition plate 14, and the bearing box 9
is attached to the lower side of this air chamber 15 at a position separated from the inside air. Further, a communication pipe 16 is provided for introducing external cooling air from the external fan 7 into the air chamber 15, and an exhaust hole 17 is provided on the outer periphery of the air chamber 15 and the bearing box 9 to communicate the air chamber 15 with the outside. . By doing this, it is exposed to internal air that is 10 to 20 degrees higher than the upper part of the motor.
Heat transfer to the bearing box 9 due to the increased temperature of the partition plate 14 and the lower part of the rotor shaft 1 is blocked by the air chamber 15. The heat generated by the rotation of the lower bearing 10 is
It is removed by cooling air introduced by the communication pipe 16 that cools the surface of the bearing box 9. As described above, according to this embodiment, the cooling effect of the lower bearing 10 can be improved without providing a blower or the like, and the cooling of the lower bearing 10 can be facilitated.

〔Effect of the invention〕

As described above, the present invention facilitates cooling of the lower bearing,
It is possible to obtain a ventilation cooling device for a vertical motor that makes it possible to easily cool a lower bearing.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of an embodiment of the ventilation cooling device for a vertical motor according to the present invention, FIG. 2 is an enlarged longitudinal sectional side view of the lower bearing surroundings of the same embodiment, and FIG. FIG. 4 is a cross-sectional view taken along line A-A, and a vertical side view of a conventional ventilation cooling device for a vertical motor. DESCRIPTION OF SYMBOLS 1... Rotor shaft, 2... Stator coil, 3... Stator core, 4... Stator frame, 5... Heat exchanger, 6...
...Wind tunnel, 7...External fan, 8...Internal fan,
9...Bearing box. 10... Lower bearing, 14... Partition plate, 15... Air chamber. (1 other person) 1st 2121 3rd day

Claims (1)

[Claims] 1. A heat exchanger provided in a stator frame that is arranged to face a rotor having a vertical rotor shaft and that surrounds and supports a stator core around which a stator coil is wound, and the rotor. an external fan provided at the top of the shaft to introduce cooling air into the heat exchanger from the outside; and an internal fan provided at both ends of the rotor to cool the rotor, stator coil, and stator core. Cooling air is applied to the heat exchanger, above the stator frame,
an internal fan that circulates the air through ventilation passages provided at the bottom thereof, and a cooling means provided at the bottom side of the rotor shaft to cool the lower bearing housed in the bearing box. In the ventilation cooling device for a type electric motor, the cooling means is provided between the lower stator frame and the rotor shaft, and a partition plate that prevents the internal cooling air from leaking to the outside; an air chamber provided at a lower part of the plate and between the bearing box; a communication pipe that communicates between the air chamber and the external fan and introduces external cooling air into the air chamber; and the air chamber. A ventilation cooling device for a vertical motor, comprising: and an exhaust hole provided on the outer periphery of a bearing box and communicating the air chamber with the outside.