JP6110338B2 - Rotating electric machine - Google Patents

Description

  Embodiments described herein relate generally to a rotating electrical machine that combines a rotating electrical machine body and a cooler.

  As a rotating electrical machine such as an electric motor, there is a fully-enclosed external fan-shaped rotating electrical machine that cools high-temperature air that has cooled the rotating electrical machine main body with a cooler configured by a plurality of cooling pipes (pipes) that circulate outside air (for example, Patent Document 1).

  A plurality of pipes penetrating in the axial direction are arranged in the cooler of the rotating electric machine, and the outside air of the electric motor flows as a cooling medium in the pipes. And it is the structure which cools the inside of a rotary electric machine on the outer side of this pipe, crosses the inside air which became high temperature, performs heat exchange with outside air, and cools.

  In the case of such a structure, a partition plate orthogonal to the pipe is provided in order to flow high-temperature inside air in the crossing direction. However, depending on the positional relationship between the inlet and outlet of the inside air to the cooler and the partition plate, A portion where the inside air hardly flows is generated near the plate. For this reason, the heat exchange of this part was not fully performed and the cooling efficiency was bad.

Japanese Utility Model Publication No. 59-53674

  The problem to be solved by the present invention is to provide a rotating electrical machine with improved cooling efficiency by improving the flow of air in the cooler.

  A rotating electrical machine according to an embodiment of the present invention includes a rotating electrical machine body that is supplied from one end side in the direction of the rotation axis and discharges air that has cooled the inside from the other end side in the direction of the rotation axis, and the rotating electrical machine body The rotating shaft direction and the length direction of the cooling device are arranged in parallel, and each of the cooling device has a plurality of cooling pipes through which the cooling medium flows, and the cooling device is provided at the intermediate portion in the length direction. The cooling space formed by the cooler is partitioned in the longitudinal direction to form one cooling space and the other cooling space, the both ends of the rotating electrical machine main body, and the outer surface of the cooler are kept spaced from each other. The air discharged from the other end side of the rotating electrical machine main body is guided in a direction intersecting with one cooling space of the cooler, and the air intersecting with one cooling space is guided to the other cooling space side. Intersects with this other cooling space And a cover for supplying air intersecting with the other cooling space from the one end side of the rotating electrical machine body, and a part of the air flowing in the direction intersecting with the one cooling space is provided on the partition plate. A vent portion for directly ventilating the other cooling space is provided.

It is an internal block diagram explaining the rotary electric machine which concerns on one embodiment of this invention. It is a front view which shows the example of a shape of the ventilation part provided in the partition plate shown in FIG. It is a front view which shows the other example of a shape of the ventilation part provided in the partition plate shown in FIG. It is an internal block diagram explaining the basic composition and ideal ventilation state of the same kind of rotary electric machine as what was shown in FIG. It is an internal block diagram explaining the actual ventilation | gas_flowing state in the rotary electric machine shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  First, the basic configuration of the same type of rotating electrical machine according to this embodiment will be described with reference to FIG. The rotating electrical machine 10 includes a rotating electrical machine main body 11, a cooler 12 that cools the inside of the rotating electrical machine main body 11 to a high temperature (hereinafter also referred to as internal air), and an intermediate lengthwise direction of the cooler 12. It is roughly comprised by the partition plate 13 provided in a part, and the cover 14 which covers these whole.

  The rotating electrical machine main body 11 includes a rotor 17 that is integrally attached to the outer periphery of the rotating shaft 16 and a stator 18 that faces the outer peripheral surface of the rotor 17 with a predetermined gap. Both ends of the rotating shaft 16 are rotatably supported by bearings (not shown). An air passage 20 is formed along the axial direction between the rotary shaft 16 and the rotor 17, and a plurality of portions of the rotor 17 and the stator 18 facing each other along the axial direction are formed. Are formed with ventilation ducts (not shown) along the radial direction thereof. Further, a main body cover 21 is disposed outside the stator 18 with a distance from the outer peripheral surface thereof.

  In the rotating electrical machine main body 11, air (inside air) supplied from one end side (the left side in the figure) in the axial direction flows in the axial direction as indicated by an arrow a through the air passage 20, and is supplied to a plurality of locations in the axial direction. It flows as shown by an arrow b through a formed ventilation duct (not shown) extending in the radial direction to cool the inside of the rotor 17 and the stator 18. Thereafter, the air flows between the outer periphery of the stator 18 and the main body cover 21 as indicated by an arrow c, and is discharged from the other end side (right side in the drawing) of the rotating electrical machine main body 11 in the axial direction. The air discharged from the rotating electrical machine main body 11 is blown toward the cooler 12 as indicated by an arrow d by a fan 22 attached to the right end of the rotating shaft 16 in the figure.

  The cooler 12 has a plurality of cooling pipes (not shown) in which the rotating shaft direction and the length direction of the rotating electrical machine main body 11 are arranged in parallel. A plurality of these cooling pipes are arranged in parallel with a space between each other, and a cooling medium flows inside each. As the cooling medium flowing through the cooling pipe, outside air blown by an external fan (not shown) is used.

  As described above, the partition plate 13 is provided at an intermediate portion in the longitudinal direction of the cooler 12. The partition plate 13 partitions the cooling space by the cooler 12 in the length direction, and divides the space into one cooling space 12A on the right side in the drawing and the other cooling space 12B on the left side in the drawing.

  The cover 14 covers the entire body including the rotating electrical machine main body 11 and the cooler 12, and as shown in the figure, the left and right ends of the rotating electrical machine main body 11 and the outer surface (upper surface in the drawing) of the cooler 12 are kept spaced from each other. Covered. Therefore, the air discharged from the other end side (the right end side in the figure) of the rotating electrical machine main body 11 and blown by the fan 22 is guided in the direction of the arrow d as described above, and as shown by the arrow e, Guiding in a direction intersecting with one cooling space 12A. Further, the air intersecting with the one cooling space 12A is guided to the other cooling space 12B side as indicated by an arrow f, and intersected with the other cooling space 12B as indicated by an arrow g. And the air which cross | intersected this other cooling space 12B is again supplied to the rotary electric machine main body 11 from the one end side (illustration left end side) as shown by the arrow h.

  In the rotating electrical machine 10 having such a configuration, air (inside air) discharged from the right end of the rotating electrical machine main body 11 after being cooled is blown toward the cooler 12 by the fan 22. And it cross | intersects the outer periphery of the several cooling pipe which comprises the cooler 12, and it cools by heat-exchanging with the cooling medium in a cooling pipe. That is, it flows along the path of arrows e, f, and g, and is supplied again to the rotating electrical machine main body 11 as shown by the arrow h.

  In this case, the flow of the inside air in the cooling spaces 12A and 12B of the cooler 12 ideally configures the cooler 12 almost entirely in the cooling spaces 12A and 12B as indicated by arrows e and g in FIG. It is preferable from the viewpoint of cooling efficiency that it intersects with a cooling pipe (not shown) at a substantially right angle.

  However, the flow of air in the cooling spaces 12A and 12B is unlikely to be an ideal flow as indicated by arrows e and g in FIG. 4, and actually becomes a flow as shown in FIG. In other words, since the supply portion and the discharge portion for the inside air with respect to the rotating electrical machine main body 11 are located at the left and right ends in the figure, when looking at the cooling space 12A, the air toward the cooler 12 as shown by the arrow d is the cooling space. Near the right end of FIG. 12A, it flows in a substantially vertical direction as shown by an arrow e1, but in a portion from the center, it flows in an oblique direction toward the upper part of the partition plate 13 as shown by an arrow e2. That is, two main flows indicated by arrows e1 and e2 are formed. This is the same on the cooling space 12B side, and two main flows indicated by arrows g1 and g2 are formed.

  For this reason, in the part X near the lower part of the partition plate 13, the air is stagnated with almost no flow, heat exchange with the cooling medium (outside air) in the cooling pipe in the cooler 12 is not performed, and the cooling efficiency is lowered.

  In this case, the distance Y (shown in FIG. 4) between the outer surface of the main body cover 21 of the rotating electrical machine main body 11 and the lower surface of the cooler 12 shown in the figure is increased so that air can flow easily between them or the cooler 12 is configured. A plurality of cooling pipes (not shown) are densely arranged to increase resistance to the air flow in the direction of the arrow d and to suppress the rise. In this way, as shown by the arrow d1 (shown in FIG. 4), air also flows near the partition plate 13, and as a result, the air flow in the entire cooling region 12A is indicated by the arrow e in FIG. It is almost vertical and is close to the ideal air flow.

  However, increasing the above-described distance Y leads to an increase in the size of the air guide formed by the outer surface of the main body cover 21 and the inner surface of the cover 14, leading to an increase in manufacturing cost and weight. Further, when the plurality of cooling pipes constituting the cooler 12 are arranged densely, the ventilation resistance is increased, and the operation efficiency is lowered. Therefore, these configurations are difficult to adopt.

  Therefore, in this embodiment, as shown in FIG. 1, the partition plate 13 is provided with a ventilation portion 24 penetrating left and right in the drawing, and a part of the air flowing in the direction intersecting one cooling space 12A is indicated by an arrow i. As shown by, it was configured to directly ventilate the other cooling space 12B. If comprised in this way, as shown in FIG. 5, until now, with respect to the flow e1, e2 which passed through the upper part of the partition plate 13, as shown in FIG. 1, the flow i used as a bypass will be provided. .

  By providing the flow i serving as a bypass, it is possible to generate a flow that guides the above-described flows e1 and e2 to the lower portion of the air guide formed by the outer surface of the main body cover 21 and the inner surface of the cover 14. As a result, the substantial heat transfer area with the plurality of cooling pipes constituting the cooler 12 can be increased, and the cooling efficiency is improved.

  Note that even if the flow rate of the flow i becomes too large, the cooling efficiency is lowered, and it is necessary to optimize the flow rate. This optimum air flow rate varies depending on the number of cooling pipes constituting the cooler 12 and the bundle density thereof, the size of the air guide formed by the outer surface of the main body cover 21 and the inner surface of the cover 14, the overall air flow rate, and the like. Since it is different, it is difficult to obtain uniquely, and it may be decided empirically by matching on site.

  As a specific shape of the ventilation portion 24, as shown in FIG. 2, a plurality of small holes communicating from one cooling space to the other cooling space are used. The shape of the hole is not limited to the illustrated perfect circle, but may be an ellipse or a polygon, and may be a slit as shown in FIG. 2 and 3, reference numeral 25 denotes a plurality of cooling pipes constituting the cooling device 12, and is installed through the partition plate 13 and the cooling spaces 12 </ b> A and 12 </ b> B shown in FIG. 1. A cooling medium circulates inside.

  Here, in the case of the hole-shaped ventilation portion 24 shown in FIG. 2, the amount of ventilation by the ventilation portion 24 of the partition plate 13 can be optimized by adjusting the size, number, and arrangement of the holes. Further, in the case of the slit-like ventilation portion 24 of FIG. 3, it can be optimized by adjusting the slit width, the number thereof, the arrangement position, and the like.

  Although several embodiments of the present invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 ... Rotating electrical machine 11 ... Rotating electrical machine main body 12 ... Cooler 12A, 12B ... Cooling space 13 ... Partition plate 14 ... Cover 16 ... Rotating shaft 24 ... Ventilation part 25 ... Cooling pipe

Claims (3)

A rotating electrical machine main body that is supplied from one end side in the rotation axis direction and discharges air that has cooled the inside from the other end side in the rotation axis direction;
A cooler having a plurality of cooling pipes in which the rotation axis direction and the length direction of the rotating electrical machine main body are arranged in parallel, and in which a cooling medium flows, respectively;
A partition plate provided in the longitudinal direction intermediate portion of the cooler, and partitioning a cooling space by the cooler in the length direction to form one cooling space and the other cooling space;
The both ends of the rotating electrical machine body and the outer surface of the cooler are respectively covered at intervals, and the air discharged from the other end side of the rotating electrical machine body is crossed with one cooling space of the cooler. The air that crosses the one cooling space is guided to the other cooling space side, crosses the other cooling space, and the air that crosses the other cooling space flows from the one end side of the rotating electrical machine main body. With a cover to supply,
The partition plate is provided with a ventilation portion that directly vents part of the air flowing in the direction intersecting the one cooling space into the other cooling space.
Rotating electric machine characterized by that.   The fully-enclosed external fan-type rotating electrical machine according to claim 1, wherein the ventilation portion provided in the partition plate is a plurality of small holes that communicate from one cooling space to the other cooling space.   The fully-enclosed fan-shaped rotating electrical machine according to claim 1, wherein the ventilation portion provided in the partition plate is a slit that leads from one cooling space to the other cooling space.

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