JPH083173Y2 - Rotating electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to improvement of a cooling structure of a rotating electric machine, for example, a generator, and particularly to a temperature of gas inside a machine discharged from a stator of the generator. Regarding improvement of distribution.

(Conventional Technology) A conventional technology will be described with reference to FIG. FIG. 6 is a cross-sectional view of an essential part showing a configuration in the vicinity of the in-machine gas cooler provided under the foundation of the generator. Gas in the machine is blown by a fan 6 provided in the rotor 2 as shown by an arrow in the figure. And the heat is exchanged by the air cooler 3.

That is, the fan 6 provided on the rotating shaft is rotated by the operation of the generator, and the rotation of the fan 6 causes the surrounding gas inside the machine to partially cool the rotor winding of the rotor 2 and the rotor core. The air is exhausted from a plurality of ventilation holes formed in the axially intermediate portion of the rotor core to a gap formed on the inner peripheral side of the rotor and the stator core 8 (arrow in the rotational axis direction in the figure).
Further, a part thereof does not go through the rotor winding of the rotor 2 or the rotor core, but directly reaches the gap portion which is the inner peripheral portion of the stator core 8. Then, the in-machine gas merged here is the stator 8
Since the stator core 8 is warmed by cooling by passing from the inner peripheral side to the outer peripheral side, that is, in the radial direction, heat is exchanged by being cooled by the air cooler 3 provided in the lower part of the generator. .

In order to reduce windage loss, it is preferable that the air cooler 3 has a large opening area in a portion through which the in-machine gas passes and has a thin shape. The fan 6 circulates the in-machine gas to cool the stator 1, the stator coil 7, the stator core 8 and the like, and then the air is passed to the air cooler 3 as an in-machine gas cooler.

(Problems to be solved by the invention) However, as shown in FIG. 6, the gas inside the machine, which has cooled the rotor 2, increases the flow rate in the central portion of the rotor 2 to enhance cooling, so that ventilation Due to the structure, it may happen that the in-machine gas does not pass evenly to the air cooler 3.

In general, the in-machine gas that passed through the gap or the stator core 8 was concentrated in the central portion as shown in FIG. In this case, the in-machine gas flows centrally in the central portion of the air cooler 3 to locally cool the air cooler 3, so that the output of the air cooler 3 is not fully utilized and a sufficient cooling effect is obtained. Couldn't get

In order to avoid this, when the air cooler 3 is moved to a place where the distribution of the gas flow rate inside the machine becomes uniform, the air cooler 3 must be installed considerably below the generator foundation, and the cooling air guide 4 Grows larger. Further, if cooling is performed only in the central portion where the internal gas is concentrated, it is necessary to cool the internal gas that intensively flows in the central radial direction of the air cooler 3. Therefore, in order to obtain the output, the air cooler is used. There was a problem that it was thick and large.

The object of the present invention is to eliminate the drawbacks of the conventional ventilation structure described above, and to equalize the temperature distribution on the inlet side of the cooler by equalizing the gas flow rate distribution inside the cooler that flows into the cooler, and to improve the output of the cooler. It is to provide a rotating electric machine that can be effectively utilized.

[Means for Solving the Problem] (Means for Solving the Problems) A rotating electric machine according to the present invention includes a fan provided on a rotating shaft of the rotating electric machine, which circulates internal gas sealed in the rotating electric machine, and a rotating electric machine. The inside of the machine, which is provided in the lower part and is formed in a rectangular shape in the axial direction of the rotating electric machine, and is warmed by the fan by cooling the stator core through the gap between the rotor and the stator of the rotating electric machine and the stator core of the rotating electric machine An in-machine gas cooler for cooling by introducing and discharging the gas in the radial direction of the rotating electric machine, and a rectangular shape parallel to the introduction part of this in-machine gas cooler, and as it goes to the longitudinal end of this rectangle A ventilation adjusting plate with an introduction hole that increases the area,
And a cooling air guide for guiding, to the fan, the in-machine gas that is provided on the stator side of the rotating electric machine and is cooled by passing through the ventilation adjusting plate and the in-machine gas cooler and dropped to the lower part of the rotating electric machine. And

(Operation) Since the present invention is configured as described above, the in-machine gas that has concentratedly flown out in the radial direction from the stator core 8 to the central portion of the in-machine gas cooler 3 in the axial direction becomes a long axis. Before reaching the thin rectangular in-machine gas cooler 3, there is a ventilation adjusting plate 5 that is provided in parallel with and substantially the same shape as the introduction part of the in-machine gas cooler 3, or the area becomes larger as it goes in the longitudinal direction. Even if the in-machine gas intensively flows out from the central portion of the stator core 8 due to the holes, the area of the central introduction hole is small, so that the flow rate passing through the in-machine gas cooler 3 in the radial direction is suppressed. The suppressed flow rate is caused to flow radially from the large-area introduction hole at the end of the long axis to the in-machine gas cooler 3 to suppress the in-machine gas flow rate that was intensively flowing in the central part, and this suppression It is possible to distribute the amount that you made to the end Becomes

Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an essential part showing an embodiment of the configuration of a rotary electric machine according to the present invention, and FIG. 2 is a front view showing an embodiment of the shape of a ventilation adjusting plate according to the present invention.

An in-machine gas cooler 3 for cooling the in-machine gas is provided below the rotary electric machine including the stator 1 and the rotor 2 provided on the rotary shaft. This in-machine gas cooler 3 is provided in a rectangular shape in the rotation axis direction with a wide area opening and a thin shape in order to reduce windage loss due to passage of in-machine gas. Up to the fan 6 provided on the rotary shaft to recirculate the in-machine gas that has flowed in from the introduction part of the in-machine gas cooler 3 in the radial direction, is cooled there, is discharged in the radial direction, and drops to the lower part of the rotating electric machine. A cooling air guide 4 for guiding is provided.

On the other hand, on the introduction side of the in-machine gas cooler 3, there is provided a ventilation adjusting plate 5 having an introduction hole formed in a rectangular shape parallel to and substantially the same shape as the introduction portion and having an area increasing toward the longitudinal end of the rectangle. Set up.

In the figure, the arrows schematically show the flow of gas inside the machine.

As shown in FIG. 1, most of the in-machine gas circulated by the fan 6 provided on the rotary shaft in accordance with the operation of the rotary electric machine passes through the rotor 2 or directly between the rotor 2 and the stator core 8. The stator core 8 is guided to a gap formed by the inner peripheral side and passes through the stator core 8 in the radial direction to cool the stator core 8 and then to the passing cooling plate 5. Further, a part of the in-machine gas circulated by the fan 6 reaches the ventilation adjusting plate 5 without passing through the stator core 8 after cooling the stator winding 7. This is because, as described above, in order to enhance the cooling effect of the rotor, a large amount of the in-machine gas is discharged from the axially intermediate portion through the inside of the rotor and flows into the inner circumferential gap portion of the stator core 8. This is because, as a result, the amount of in-machine gas that passes through the intermediate portion of the stator core 8 in the radial direction increases as a result.

In this case, since the gas flow rate distribution shown in FIG. 7 cannot be used, the in-machine gas cooler 3 cannot be used effectively, and therefore the in-machine gas flow must be made uniform.

Therefore, a ventilation hole is provided on the introduction side of the in-machine gas cooler 3 which is formed in a rectangular shape parallel to and substantially the same shape as the introduction part of the in-machine gas cooler 3 and whose area increases toward the longitudinal end of the rectangle. Attach the adjustment plate 5. That is, as shown in FIG. 2, the introduction holes provided in the ventilation adjusting plate 5 have a small area of the introduction hole in the central portion where the in-machine gas is concentrated, and the introduction holes at both ends in the long axis direction where the in-machine gas flow rate is small. Is formed in a large area.

By adopting such a configuration, the in-flight gas concentrated in the radial direction from the stator iron core 8 to the central portion of the in-flight gas cooler 3 is cooled in a thin rectangular in-flight gas in which the longitudinal axis is the axial direction. Before reaching the air conditioner 3, the ventilation adjusting plate 5 is provided in parallel with and substantially in the same shape as the introduction portion of the in-machine gas cooler 3. Since the ventilation hole 5 has an introduction hole whose area increases as it goes in the longitudinal direction, even if the in-machine gas is intensively discharged from the central portion of the stator core 8, the introduction hole in the central portion is introduced. Since the area of is small, the flow rate passing through the in-machine gas cooler 3 in the radial direction is suppressed, and the suppressed flow rate is increased in the radial direction from the large-area introduction hole at the end in the long axis direction to the in-machine gas cooler 3. Spill to. As a result, by suppressing the flow rate of the in-machine gas, which has conventionally been concentrated in the central portion, and distributing the suppressed amount to the end portions, the in-machine gas that passes through the in-machine gas cooler 3 in the radial direction and exchanges heat. Since the flow rate can be made uniform, the output of the in-machine gas cooler 3 can be effectively utilized.

Of course, the shape of the introduction hole provided in the ventilation adjusting plate 5 used in the present invention is not limited to the shape used in FIG. 2 and may be the shape shown in FIGS. 3 to 5.

[Advantages of the Invention] As described above, according to the rotating electric machine of the present invention, the in-machine gas that has intensively flown out from the central portion of the stator core 8 is passed through the ventilation adjustment plate 5 to generate the in-machine gas. Since the in-machine gas flowing into the cooler 3 can be equalized, it is possible to provide a rotating electric machine that can effectively utilize the output of the in-machine gas cooler 3.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the configuration of a rotary electric machine according to the present invention, FIG. 2 is a front view showing an embodiment of the shape of a ventilation adjusting plate according to the present invention, and FIG. FIG. 4 is a front view showing a modification of the shape of the ventilation adjusting plate according to the present invention, FIG. 4 is a front view showing a modification of the shape of the ventilation adjusting plate according to the present invention, and FIG. 5 is a shape of the ventilation adjusting plate according to the present invention. 6 is a front view showing a modified example of FIG.
FIG. 7 is a cross-sectional view of a main part showing the configuration of a conventional rotary electric machine, and FIG. 7 is a distribution diagram schematically showing a flow rate distribution of in-machine gas flowing into an air cooler 3 as a conventional in-machine gas cooler. 1 ... Stator, 2 ... Rotor, 3 ... In-machine gas cooler,
4 ... Cooling air guide, 5 ... Ventilation adjusting plate, 6 ... Fan, 7
...... Stator coil, 8 …… Stator core.

Claims (1)

[Scope of utility model registration request] 1. A fan provided on a rotary shaft of a rotating electric machine for circulating internal gas sealed in the rotating electric machine,
The stator core is provided in the lower part of the rotary electric machine and is formed in a rectangular shape in the axial direction of the rotary electric machine by the fan through the gap between the rotor and the stator of the rotary electric machine and the stator core of the rotary electric machine to move the stator core. An in-machine gas cooler for cooling by introducing and discharging the in-machine gas warmed by cooling in the radial direction of the rotating electric machine, and formed in a rectangle parallel to the introduction part of the in-machine gas cooler. Cooling by passing through the ventilation adjustment plate having an introduction hole whose area increases toward the end of the rectangular long axis and the ventilation adjustment plate and the in-machine gas cooler provided on the stator side of the rotating electric machine. And a cooling air guide for guiding the in-machine gas that has fallen below the rotating electric machine to the fan.