JPH06217495A - Cooling system for electric rotating machine - Google Patents

Abstract

PURPOSE:To prolong service life of electric rotating machine by lowering the temperature of cooled inner air in a split space on the flow-out side of outer air defined by partitioning the container for cooler. CONSTITUTION:A partition board 74A is disposed on the flow-out side of outer air 82, i.e., a position shifted to the right on the drawing, thus increasing the volume of a split space 701A on the flow-in side of the outer air 82 as compared with a split space 702A on the flow-out side. When the outer air 82 is fed into the split space 701A to cool the body 1 of electric rotating machine, volume of overheated inner air 81 increases and the temperature thereof increases after cooling. On the contrary, temperature of the inner air 81 lowers after cooling in the split space 702A thus prolonging the service life of the body 1 of electric rotating machine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a rotating electric machine of a totally enclosed outer fan type, and more particularly, an air-air cooling system for cooling the inside air circulated inside for cooling the stator and the rotor by the outside air. Regarding the device.

[0002]

2. Description of the Related Art FIG. 4 is a side sectional view of a conventional fully-closed fan-shaped rotating electric machine. In this figure, the rotary electric machine main body 1 including the stator 11 and the rotor 13 is cooled by the inside air 81 which indicates the direction of flow by the chain line arrow. The rotor 13 is fixed to the rotary shaft 4 and rotates synchronously, but the internal fans 41 are fixedly attached to both sides of the rotary shaft 4, and the internal air 81 guided by the air guide 3 is the main body of the rotating electric machine. The cores and coils that are guided into the rotary electric machine main body 1 to be cooled are cooled.

The stator 11 and the rotor 13 are provided with cooling ducts 12 and 14, respectively, and inside air 81 is passed through the air holes 15 provided in the rotor 13 to the cooling duct 14 and then to the cooling duct 12. To cool each core and coil. Although the coil end portion of the stator 11 is shown without a reference numeral, this portion is directly connected to the internal fan 41.
It is cooled by the inside air 81 that has entered inside.

The inside air 81 whose temperature has risen after cooling is guided to the air guide 3 and flows into the cooler 7. Since the cooler 7 is provided in the upper part of the rotating electric machine, the inside air 81 flowing out from the rotating electric machine body 1 radially flows radially toward the outer diameter side and gathers in the cooler 7 along the air guide 3. The container 70 of the cooler 7 has a substantially rectangular cross-sectional shape except for the fan cover 6, a plurality of cooling pipes 72 pass through the container 70 in the axial direction, and the outside air 82 indicated by solid arrows flows through the container 70.
The outside air 82 is sucked from the outside by the external fan 42, guided to the fan cover 6, and flows into the cooling pipe 72. In the figure, only two cooling pipes 72 are shown in a sectional view, and the others are simply shown by a two-dot chain line. As a matter of course, they are distributed in the direction perpendicular to the paper surface. Inside air 81 mainly flows in the radial direction in the space outside the cooling pipe 72 in the cooler 7. Heat is exchanged on the wall of the cooling pipe 72, the high temperature inside air 81 is cooled, the temperature of the low temperature outside air 82 rises, and the overheated outside air 82 is discharged to the outside from the right side of the drawing. The cooled inside air 81 is guided to the air guide 3, sucked by the internal fan 41, and enters the inside of the rotary electric machine body 1 again. The cooling space 71 in the container 70 is divided by a partition plate 74 into two independent spaces 701 and 702. In the divided space 701, the inside air 81 circulated by the internal fan 41 on the left side of the drawing is divided into the divided space 7
Inside air 81 circulated by the right internal fan 41 flows through 02. In addition, the respective divided spaces 701 and 7
02 is further divided into two spaces whose upper parts are connected by guide plates 731 and 732, and the inside air 81 that has cooled the rotating electric machine main body 1 enters the space on the central side and rises, and is inverted at the upper part to both end sides. Down the space.

[0005]

By the way, according to the structure of the cooler 7 described above, the outside air 82 flowing into the cooler 7 first cools the inside air 81 in the divided space 701 to raise the temperature, and thereafter. The inside air 81 in the divided space 702 is cooled. Therefore, the temperature of the inside air 81 after cooling the divided space 702 becomes higher than the temperature of the inside air 81 by the amount of the temperature increase of the outside air 82 due to the cooling of the inside air 81 in the divided space 701. As is well known, the life of electrical equipment is determined by the degree of deterioration of the insulator, and the rate of deterioration of the insulator is higher as the temperature is higher. Therefore, the temperature of the inside air 81 for cooling the rotating electric machine body 1 after cooling is The imbalance causes a problem that the life of the rotating electric machine is shortened.

An object of the present invention is to provide a cooling device for a rotary electric machine, which solves such a problem, and which makes the temperature of the internal air after cooling uniform, thereby extending the life of the rotary electric machine.

[0007]

In order to solve the above-mentioned problems, according to the present invention, a container provided on the upper part of a rotating electric machine body, a plurality of cooling pipes penetrating the container in the axial direction, and this cooling pipe. A cooling space inside the container that encloses the space and a cooler that is composed of a partition plate that divides this cooling space into two divided spaces, an inflow side and an outflow side of the outside air, and two fixings on both sides of the rotating shaft with the rotating electric machine main body sandwiched between them. In the cooling device of the rotating electric machine, in which the internal air in the main body of the rotating machine is forcibly circulated in each of the two divided spaces by the internal fan, the volume of the divided space on the inflow side of the outside air is different from that of the divided space on the outflow side. The cross-sectional shape of the cooler is rectangular, and the partition plate is parallel to two sides of the rectangular outside air that are opposed to the direction in which the outside air flows in the cooling pipe and the outside air flows out. Biased to the side The cross-sectional shape of the cooler is trapezoidal, and the length of the side on the inflow side of the outside air is a predetermined ratio larger than 1 with respect to that on the outflow side. Further, instead of the cooler described above in which the partition plate is provided in a position biased to the outflow side, the partition plate connects the main part that partitions the cooling space and the air guide by connecting this main part and the air guide. It is composed of a guide part that guides the inside air flowing in from each of the divided spaces, and the main part is located in the central part in the direction in which the outside air of rectangular cross section flows in the cooling pipe, and the connecting part between the guide part and the air guide is the outside air. It should be provided at a position biased to the outflow side of.

[0008]

In the structure of the present invention, of the two divided spaces of the cooler divided by the partition plate, the divided space on the inflow side of the outside air is made larger in volume than the divided space on the outflow side to rotate. The amount of the inside air that has been overheated by cooling the electric machine body flowing into the divided space having the larger volume increases or the cooling effect decreases, so that the temperature of the inside air after cooling rises. On the contrary, in the divided space having the smaller volume, the temperature of the inside air after cooling becomes low. As a result, the temperature difference of the inside air after cooling in the divided space between the inflow side and the outflow side of the outside air due to the temperature difference of the outside air is compensated and becomes small, and by appropriately setting the ratio of the volumes of the two divided spaces. The temperature difference can be substantially matched.

Further, by providing the partition plate at a position parallel to the two sides of the rectangular shape which are opposed to each other in the axial direction and biased to the outflow side of the outside air, the conventional cooling device having a rectangular sectional shape can be easily provided. As the volume ratio of the two divided spaces is changed and the amount of the inflowing air increases with the volume, the amount of heat exchanged in this divided container increases and the temperature after cooling rises. The temperature of one side becomes low.

Further, the cross-sectional shape of the cooler is made trapezoidal, and the ratio of the length of the side on the inflow side to the length of the side on the outflow side of the outside air is made larger than 1 to make the volume of the divided space on the inflow side of the outside air. By increasing the volume of the divided space on the outflow side, the flow velocity of the inside air in the divided space having a large volume is reduced, so that the cooling effect decreases and the temperature of the inside air after cooling increases.
On the contrary, the temperature of the inside air after cooling the divided space having a small volume becomes low.

Further, instead of disposing the partition plate of the cooler having a rectangular cross section at an eccentric position, the partition plate is composed of a main part for partitioning the cooling space and a guide part, and the main part has a rectangular cross section as usual. By arranging it in the central part in the axial direction and providing the connecting part of the guide part with the air guide at a position biased to the outflow side of the outside air, the divided space on the inflow side of the outside air is more Since a large amount of inside air flows in, the amount of heat exchange increases and the temperature of the cooled inside air rises. On the contrary, in the divided space on the outflow side, the amount of heat exchange decreases and the temperature of the cooled inside air becomes low.

[0012]

EXAMPLES The present invention will be described below based on examples.
FIG. 1 is a side sectional view of a main part of a fully-enclosed fan-shaped rotating electric machine showing a first embodiment of the present invention. The same members as those in FIG. And omit detailed explanations as appropriate. Further, the lower part of the drawing, which is omitted while leaving a part of the rotary electric machine main body 1, has the same configuration as that of FIG. In this figure, the difference from FIG. 4 is that the partition plate 74A is provided near the outflow side of the outside air 82, which is the right direction in the figure. As a result, the left divided space 701A
Becomes larger and the right divided space 702A becomes smaller, and the volumes of these two divided spaces change. Further, the amount of the inside air 81 flowing into the cooler 7A from the rotary electric machine body 1 via the air guide 3 is larger in the divided space 701A.

By the way, the fact that the inflow amount of the inside air 81 is large means that the heat exchange amount in the divided space 701A is large. As a result, the temperature of the inside air after cooling in the divided space 701A is the same as that in the conventional case of FIG. It will be higher than the one. On the contrary, in the divided space 702A, the temperature of the inside air after cooling becomes low. As described above, in the conventional cooler, the temperature of the inside air in the divided space 702 after cooling tends to be higher than that in the divided space 701. Therefore, as described above, the position of the partition plate 74A is set to the outside air outflow side. The temperature difference after cooling the inside air due to the difference in the outside air temperature can be compensated for by reducing the value, and this temperature difference can be substantially reduced by appropriately setting the position where the partition plate 74A is provided. It is possible to eliminate it. When there is a difference in the temperature of the inside air after cooling, the life of the rotating electric machine is determined by the higher temperature, and therefore the life is extended by lowering the higher temperature. When the temperature difference between the two is eliminated, the higher temperature can be the lowest, and this is the case where the life is longest.

FIG. 2 is a side sectional view of a main part of a fully-closed outer fan type rotary electric machine showing a second embodiment of the present invention. The same members as those in FIG. Add B to omit detailed explanations as appropriate. The difference from FIG. 1 of this figure is that the connection position of the partition plate 74B with the air guide 3 is provided at a position biased to the outflow side of the outside air, and the main part of the partition plate 74B that partitions the cooling space 71B into the left and right sides. The position of 741 is kept at the same central position as in FIG. 4 of the related art, and instead, the position of the connecting portion of the guide portion 742 connecting the main portion 742 and the air guide 3 to the air guide 3 is biased to the outflow side of the outside air. That is. Therefore, the guide portion 7 is arranged obliquely as shown in the figure. By doing this,
Cooling space 71 from rotating electric machine body 1 via air guide 3
A large amount of the inside air that has flowed into B before cooling flows into the divided space 701B. As a result, as in the case of FIG. 1, the temperature of the inside air after cooling in the divided space 701B becomes higher, and conversely, the temperature of the inside air after cooling in the divided space 702B becomes lower, and the inside air due to the temperature difference between the outside air becomes The temperature difference after cooling is compensated and the same effect as described above is obtained.

FIG. 3 is a side sectional view of a main part of a fully-enclosed outer fan type rotary electric machine showing a third embodiment of the present invention.
The same members are designated by the same reference numerals, and the similar members are denoted by the subscript C, and a detailed description thereof is appropriately omitted. In this figure, the vessel 70C of the cooler 7C has a trapezoidal cross-sectional shape on the left side of the figure with a large outside air inflow side and a small outflow side side, and a large number of cooling pipes 72 are shown above and below the vessel 70C in the figure. The extension line of the side of is arranged so as to be approximately parallel to a line that intersects with the intersection point on the right side. The partition plate 74C is provided at the central position as in FIG. 4 of the related art. Therefore,
The vertical dimension of the figure is smaller than that of the divided space 702C.
The larger 1C results in a larger volume. The connection position of the partition plate 74C with the air duct 3 is also the same as that in FIG. 4, so the amount of the inside air 81 flowing into the divided spaces 701C and 702C is the same. On the other hand, since the flow velocity of the inside air 81 in the divided space 701C is reduced due to the difference in volume, the heat transfer coefficient on the surface of the cooling pipe 72 is reduced, the cooling effect is reduced, and as a result, the temperature of the inside air after cooling is reduced. Get higher In the divided space 702C, on the contrary, the temperature of the inside air after cooling becomes low, and the same effect that the difference in the temperature of the inside air after cooling due to the temperature difference of the outside air is compensated for and the life is extended similarly to the two embodiments described above. Can be obtained.

[0016]

As described above, according to the present invention, by increasing the volume of the divided space on the outside air inflow side compared to the other divided space, is it possible to increase the amount of the overheated inside air flowing into this divided space? Since the cooling effect is lowered, the temperature of the inside air after cooling is consequently increased. On the contrary, in the divided space having the smaller volume, the temperature of the inside air after cooling becomes low. as a result,
The difference in the temperature of the inside air after cooling in the divided space on the inflow side and the outflow side of the outside air due to the temperature difference of the outside air is compensated and becomes small.
By appropriately setting the ratio of the volumes of the two divided spaces, this temperature difference can be substantially matched. Therefore, there is an effect that the temperature of the inside air after cooling the divided space on the outflow side, which has determined the life of the rotary electric machine, is lowered, and the life is extended.

Further, by providing the partition plate at a position parallel to the two sides of the rectangular shape which are opposed to each other in the axial direction and biased to the outflow side of the outside air, the conventional cooling device having a rectangular sectional shape can be easily provided. A structure in which the ratio of the volumes of the two divided spaces is changed can be adopted, and therefore the above-mentioned effects can be easily obtained. Further, the cross-sectional shape of the cooler is trapezoidal, and the ratio of the length of the side on the outflow side to the length of the side on the outflow side of the outside air is smaller than 1 to reduce the volume of the divided space on the inflow side of the outside air to the outflow side. The same effect as described above can be obtained by making the volume smaller than the volume of the divided space.

Further, instead of disposing the partition plate of the cooler having a rectangular cross section at an eccentric position, the partition plate is composed of a main part for partitioning the cooling space and a guide part, and the main part has a rectangular cross section as usual. By arranging in the central part in the axial direction and arranging the connecting part of the guide part with the air guide in a position biased to the outflow side of the outside air, the outflow side divided space has a larger number of parts than the inflow side divided space. Since the inside air flows in, the amount of heat exchange increases and the temperature of the cooled inside air rises.On the contrary, in the divided space on the outflow side, the amount of heat exchange decreases and the temperature of the cooled inside air decreases, resulting in Similar to the above, the temperature difference of the outside air can be compensated, and as a result, the same effect that the life of the rotating electric machine main body is extended can be obtained.

[Brief description of drawings]

FIG. 1 is a side sectional view of a main part of a fully-closed fan-shaped rotating electric machine according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of a main part of a fully-closed fan-shaped rotating electric machine according to a second embodiment of the present invention.

FIG. 3 is a side sectional view of a main part of a fully-enclosed outer fan type rotary electric machine according to a third embodiment of the present invention.

FIG. 4 is a side sectional view of a conventional fully-closed fan-shaped rotating electric machine.

[Explanation of symbols]

 1 Rotating Electric Machine Main Body 3 Air Guide 4 Rotating Shaft 41 Internal Fan 42 External Fan 7A Cooler 70A Cooling Space 71A Cooling Space 701A Divided Space 702A Divided Space 72 Cooling Tube 74A Partition Plate 7B Cooler 70B Container 71B Cooling Space 701B Divided Space 702B Space 74B Partition plate 7C Cooler 70C Container 71C Cooling space 701C Divided space 702C Divided space 74C Partition plate 81 Inside air 82 Outside air

Claims (4)

[Claims] 1. A container provided on an upper part of a rotating electric machine main body, a plurality of cooling pipes penetrating the container in an axial direction, a cooling space inside the container that encloses the cooling pipes, and an outside air inflow side and an outflow side of the cooling space. The inside air in the main body of the rotating machine is divided into the two divided spaces by a cooler composed of a partition plate that divides the rotary electric machine into two divided spaces, and two internal fans that are fixed on both sides of the rotating shaft with the rotating electric machine main body sandwiched therebetween. In a cooling device for a rotating electric machine that is forcedly circulated and cooled, the volume of the divided space on the inflow side of the outside air has a predetermined ratio larger than 1 with respect to that of the divided space on the outflow side. Cooling system. 2. The cooler has a rectangular cross-sectional shape, and a partition plate is provided at a position parallel to two sides of the rectangular outside air which face each other in the direction in which the outside air flows in the cooling pipe and which is biased toward the outflow side of the outside air. The cooling device for a rotating electric machine according to claim 1, wherein: 3. The cooler has a trapezoidal cross-sectional shape, and the length of the side on the inflow side of the outside air is a predetermined ratio larger than 1 with respect to that on the outflow side. Cooling device for rotating electric machine. 4. The cooler of the cooling device for a rotary electric machine according to claim 2, wherein the partition plate is provided at a position biased to the outflow side, and the partition plate partitions the cooling space and a main part of the cooling plate. And a guide part that connects the air guide and the inside air that flows in from the air guide to the respective divided spaces, and the main part is arranged in the central part in the direction in which the outside air having a rectangular cross section flows in the cooling pipe. A cooling device for a rotary electric machine, wherein a connecting portion between the guide portion and the air guide is provided at a position biased to an outside air outflow side.