JP4274621B2 - Cooling device for rotating electrical machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling device for a rotating electrical machine that has a heat exchanger in the upper part of the rotating electrical machine body and cools the inside of the rotating electrical machine body by forced ventilation using a cooling fan.
[0002]
[Prior art]
Generally, a rotating electrical machine includes a cooling device for removing heat generated inside. As a cooling device for a rotating electrical machine, for example, a heat exchanger is provided at the top of the rotating electrical machine body, and cooling air cooled by the heat exchanger is circulated inside the rotating electrical machine body to cool the interior of the rotating electrical machine body. Yes. Air is supplied to the heat exchanger from the outside of the rotating electrical machine, heat is exchanged with the internal heat, and the warmed air is discharged to the outside.
[0003]
FIG. 3 is a schematic cross-sectional view of a conventional cooling device for a rotating electrical machine, and shows the cooling device when the rotating electrical machine is a fully-enclosed outer fan induction motor. In FIG. 3, a rotor core 3 is press-fitted to the outer periphery of the rotor shaft 2 inside the outer frame 1 of the rotating electrical machine, and a cooling fan 4 is press-fitted to the right side of the rotor shaft 2. The cooling fan 4 is driven by the rotation of the rotor shaft 2.
[0004]
A partition member 5 is provided on the left side of the cooling fan 4, and a heat exchanger 6 is installed on the upper portion of the outer frame 1 that is the upper portion of the partition member 5. A stator core 7 is fixed to the center of the outer frame 1 so as to be covered with the partition member 5.
[0005]
On the other hand, a cooling fan 8 is press-fitted outside the outer frame 1 on the left side of the rotor shaft 2, and the cooling fan 8 is driven by the rotation of the rotor shaft 2. The cooling fan 8 supplies air into the ventilation duct 9, and external heat from the air intake port 15 of the intake cover 10 provided on the non-direct connection side of the rotating electrical machine passes through the ventilation duct 9 and the heat exchanger. 6 is supplied. A sound insulating plate 14 is provided inside the intake cover 10.
[0006]
Thus, the external air from the air inlet 15 of the intake cover 10 is supplied to the heat exchanger 6 through the ventilation duct 9 by the cooling fan 8, warmed by heat exchange, and passed through the exhaust cover 11 to the outside. Discharged. A sound insulation plate 14 is also provided inside the exhaust cover 10.
[0007]
Inside the outer frame 1 and the heat exchanger 6, circulating air is sent to the heat exchanger 6 as indicated by an arrow 12 a by the cooling fan 4 that rotates by the rotation of the rotor shaft 2. The circulating air that has been sent is cooled through the cooling pipes of the heat exchanger 6 as indicated by an arrow 12b, and is sent into the left side of the outer frame 1 as indicated by an arrow 12c.
[0008]
This cooling air flows into the ventilation port 2A of the rotor shaft 2 as shown by the arrow 12d, and a part of this cooling air flows down the ventilation port 2A in the axial direction and is used for cooling as shown by the arrow 12f1. Inhaled by the fan 4. Further, the cooling air flows down toward the outer periphery of the rotor core 3 and the outer periphery of the stator core 7, and flows out into a gap formed between the outer periphery of the rotor core 3 and the inner periphery of the stator core 7. A part of the cooling air flows down the gap in the axial direction and is sucked into the cooling fan 4. That is, the ventilation duct formed in the stator core 7 flows down toward the outer periphery of the stator, and flows down from the outer periphery of the stator core 7 toward the cooling fan 4 as indicated by an arrow 12e. This cooling air is sucked into the cooling fan 4 as indicated by an arrow 12f2. Hereinafter, it circulates with arrows 12a, 12h, 12c, 12d, 12e, 12f1, and 12f2.
[0009]
On the other hand, outside the outer frame 1 and the heat exchanger 6, external air is sucked into the cooling fan 8 from the air suction port 15 of the suction cover 10 as indicated by an arrow 13 a. This external air is sent to the inside of the cooling pipe of the heat exchanger 6 through the ventilation duct 9 by the cooling fan 8, is heat-exchanged to become warm air, flows down from the inside of the cooling pipe to the exhaust cover 11, and flows out to the atmosphere. The
[0010]
[Problems to be solved by the invention]
However, in the rotating electrical machine cooling apparatus configured as described above, the pressure loss in the ventilation path from the air inlet 15 of the intake cover 10 to the cooling fan 8 is large. Therefore, the flow rate of the external air sent into the cooling pipe of the heat exchanger 6 is significantly reduced by attaching the intake cover 10. This is because the flow of the intake air is bent abruptly by the sound insulation plate 14 installed for the sound absorption effect in the ventilation path inside the intake cover 10.
[0011]
For this reason, the heat exchange performance with the circulating air in the heat exchanger 6 decreases, and the temperature of the rotor core 3 and the stator core 7 rises. For this reason, when the intake cover 10 is attached, the current capacity of the current flowing through the rotor core 3 and the stator core 7 must be limited.
[0012]
On the other hand, in a situation where demands for reduction in size and increase in capacity of the rotating electrical machine are more severe, it is not preferable to increase the size of the air intake cover 10 or limit the current capacity. There is a strong demand for smaller size and larger capacity.
[0013]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to obtain a cooling device for a rotating electrical machine that can reduce pressure loss in an air passage and can maintain sound absorption performance.
[0014]
[Means for Solving the Problems]
A cooling device for a rotating electrical machine according to the invention of claim 1 circulates cooling air cooled by a heat exchanger at the top of the rotating electrical machine main body inside the rotating electrical machine body to cool the interior of the rotating electrical machine body, and In a cooling device for a rotating electrical machine that supplies air to the heat exchanger from the outside of the rotating electrical machine and discharges the heated air that has been heat-exchanged by the heat exchanger to the outside, the air from the outside of the rotating electrical machine is sucked An air intake port, a cooling fan for supplying external air taken from the air intake port to the heat exchanger, and an inner surface and an outer surface of a ventilation path between the air intake port and the cooling fan inlet And a conical sound insulating plate formed on the air passage, and the air passage area of the air passage between the air intake port and the cooling fan inlet is not changed .
[0015]
In the cooling device for a rotating electrical machine according to the first aspect of the present invention, the external air sucked from the air suction port is conical sound insulation formed on the inner surface and the outer surface of the ventilation path between the air suction port and the cooling fan inlet. Guided by the plate and supplied to the heat exchanger.
[0016]
A cooling device for a rotating electrical machine according to a second aspect of the invention is characterized in that, in the first aspect of the invention, a sound insulating plate having a polygonal pyramid shape is used instead of the conical sound insulating plate.
[0017]
In the cooling apparatus for a rotating electrical machine according to the invention of claim 2, in place of the action of the invention of claim 1, the external air sucked from the air suction port is in the ventilation path between the air suction port and the cooling fan inlet. It is guided by a sound insulating plate having a polygonal pyramid shape formed on the inner surface and the outer surface and supplied to the heat exchanger.
[0018]
A cooling device for a rotating electrical machine according to a third aspect of the invention is characterized in that, in the first aspect of the invention, a sound insulating material is attached to the conical sound insulating plate.
[0019]
In the cooling device for a rotating electric machine according to the invention of claim 3, in addition to the action of the invention of claim 1, the sound absorbing performance is further enhanced by the sound insulation material attached to the conical sound insulation plate.
[0020]
According to a fourth aspect of the present invention, there is provided a cooling apparatus for a rotating electric machine according to the second aspect of the present invention, wherein a sound insulating material is attached to the polygonal pyramid-shaped sound insulating plate.
[0021]
In the cooling device for a rotating electrical machine according to the invention of claim 4, in addition to the action of the invention of claim 2, the sound absorbing performance is further enhanced by the sound insulating material attached to the sound insulating plate having a polygonal pyramid shape.
[0022]
According to a fifth aspect of the present invention, there is provided a cooling apparatus for a rotating electric machine according to the first or third aspect of the present invention, wherein the bottom diameter of the conical sound insulating plate attached to the inner surface of the ventilation path is the suction of the cooling fan. It is characterized by being formed larger than the aperture.
[0023]
In the cooling apparatus for a rotating electric machine according to the invention of claim 5, in addition to the action of the invention of claim 1 or claim 3, the diameter of the bottom surface of the conical sound insulation plate is larger than the diameter of the inlet of the cooling fan. The external air sucked from the air is efficiently guided and converged to the suction port of the cooling fan.
[0024]
A cooling device for a rotating electrical machine according to a sixth aspect of the present invention is the cooling device for a rotary electric machine according to the second or fourth aspect of the present invention, wherein the minimum width of the bottom surface of the polygonal pyramid-shaped sound insulating plate attached to the inner surface of the ventilation path is the cooling device. It is characterized by being formed larger than the inlet diameter of the fan.
[0025]
In the cooling device for a rotating electric machine according to the invention of claim 6, in addition to the action of claim 2 or claim 4, the minimum width of the bottom surface of the sound insulating plate having a polygonal pyramid shape is larger than the inlet diameter of the cooling fan. The external air sucked from the mouth is efficiently guided and converged to the suction port of the cooling fan.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below. FIG. 1 is an explanatory view of a cooling device for a rotating electrical machine according to a first embodiment of the present invention. FIG. 1 (a) is a front view seen from the anti-direct connection side of the rotating electrical machine, and FIG. It is a partially cutaway schematic sectional view of a side surface.
[0027]
In FIG. 1A, the air intake cover 10 is provided with air intake ports 15 on the upper, left side, and right side portions of the intake cover 10 as viewed from the non-direct connection side of the rotating electrical machine. That is, the air inlet 15 is not provided on the anti-direct-connection side wall surface 18 of the intake cover 10 on the anti-direct connection side of the rotating electrical machine. Further, a ventilation path is formed in the intake cover 10 for the external air sucked from the air suction port 15, and this ventilation path is formed by a sound insulating plate having a conical shape or a polygonal pyramid shape. FIG. 1 shows a conical sound insulating plate formed.
[0028]
That is, as shown in FIG. 1B, the external air ventilation path indicated by the arrow 19 a sucked from the air suction port 15 is formed by the inner surface sound insulating plate 16 and the outer surface sound insulating plate 17. The inner sound insulating plate 16 is formed in a conical shape with the anti-direct-connection side wall surface 18 as a bottom surface, and the outer sound insulating plate 17 is also formed in a part of a conical shape larger than the inner sound insulating plate 16. Then, the centers of the cooling fan 8 and the rotor shaft 2 are aligned with the centers of the conical inner sound insulating plate 16 and the outer sound insulating plate 17, and the diameter d _{S of the} conical bottom surface is larger than the inlet diameter d _F of the cooling fan 8. Make it bigger.
[0029]
Similarly, when the ventilation path is formed by a polygonal pyramid-shaped sound insulation board instead of the conical shape, the inner sound insulation board 16 is formed in a polygonal pyramid shape with the anti-direct-connection side wall surface 18 as a bottom surface, and the outer sound insulation board 17 is also formed. It is formed of a part of a polygonal pyramid shape larger than the inner sound insulating plate 16. The centers of the cooling fan 8 and the rotor shaft 2 are aligned with the centers of the polygonal pyramid-shaped inner sound insulation plate 16 and the outer sound insulation plate 17, and the minimum width L _S of the polygonal pyramid bottom is the suction port diameter d of the cooling fan 8. _Make it larger than _F.
[0030]
Further, the length h _{1 of} the inner surface sound insulating plate 16 in the rotation axis direction, the inclination angle θ ₁ of the side surface of the inner surface sound insulating plate 16, the length h _{2 of} the outer surface sound insulating plate 17 in the rotation axis direction, the inclination of the side surface of the outer surface sound insulating plate 17. By setting the angle θ ₂ to an appropriate value, it is possible to provide a ventilation path in which the ventilation area does not change from the air suction port 15 to the cooling fan 8. Thereby, the pressure loss by the change of a ventilation area can be eliminated.
[0031]
As described above, according to the first embodiment, the cooling air is sucked from the air suction port 15 on the upper, left side, and right side of the intake cover 10 and sucked into the cooling fan 8, and the anti-directly connected side wall surface. Since there is no air inlet 15 in 18, noise transmitted directly from the cooling fan 8 in the anti-direct connection direction can be reduced.
[0032]
Further, the ventilation path is formed in a conical shape or a polygonal pyramid shape, and the sucked air flows toward the center of the cooling fan 8 and the rotor shaft 2, so that the flow rate distribution in the suction port of the cooling fan 8 is uniform. Distribution. Therefore, the effective area through which the cooling air flows is increased, the cooling air flow velocity at the suction port of the cooling fan 8 can be reduced, the efficiency of the cooling fan 8 can be improved, and the noise can be reduced. Further, there is almost no bending of the air flow, and the pressure loss due to the bending of the flow is very small. Further, the side surface of the intake cover 10 opposite to the direct connection side has a double structure due to the wall surface 18 and the inner sound insulating plate 16, so that noise is not easily transmitted in the anti-direct connection direction.
[0033]
Next, a second embodiment of the present invention will be described. FIG. 2 is an explanatory view of a cooling device for a rotating electrical machine according to a second embodiment of the present invention, FIG. 2 (a) is a front view seen from the anti-direct connection side of the rotating electrical machine, and FIG. It is a partially cutaway schematic sectional view of a side surface. In the second embodiment, a sound insulating material 20 is attached to the surfaces of the sound insulating plates 16 and 17 having a conical shape or a polygonal pyramid shape as compared with the first embodiment shown in FIG. Since other configurations are the same as those of the first embodiment, the same reference numerals are given to the same elements, and descriptions thereof are omitted.
[0034]
In FIG. 2 (b), a generally used sound absorbing material 20 is attached to the surfaces of the conical or polygonal conical inner sound insulating plate 16 and outer sound insulating plate 17. Thereby, the sound absorption performance can be further improved.
[0035]
【The invention's effect】
As described above, according to the first and second aspects of the invention, the inner and outer sound insulation plates of the ventilation path extending from the air intake port of the intake cover to the cooling fan are formed in a conical shape or a polygonal pyramid shape. As a result, the shape of the ventilation path can be made with little change in the ventilation area and less bending of the flow. Accordingly, it is possible to greatly reduce the pressure loss in the ventilation path, and at the same time, it is possible to greatly reduce the noise in the direction opposite to the direct connection side.
[0036]
According to the third and fourth aspects of the present invention, the sound-absorbing material is affixed to the inner and outer sound-insulating plates of the ventilation passage extending from the air intake port of the intake cover to the cooling fan, so that there is no change in the ventilation area. It can be set as the ventilation path shape with few bending of a flow. Accordingly, it is possible to greatly reduce the pressure loss in the ventilation path, and at the same time, it is possible to greatly reduce the noise in the direction opposite to the direct connection side.
[0037]
According to the fifth and sixth aspects of the present invention, air can be sucked from the circumferential direction with respect to the center line of the cooling fan and the rotor shaft, so that the flow rate distribution in the suction port of the cooling fan can be made uniform.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a cooling device for a rotating electrical machine according to a first embodiment of the present invention, and FIG. 1 (a) is a front view of the rotating electrical machine as viewed from the opposite direct connection side; (B) is the partially notched schematic sectional drawing of the side surface.
FIG. 2 is an explanatory diagram of a cooling device for a rotating electrical machine according to a second embodiment of the present invention, and FIG. 2 (a) is a front view of the rotating electrical machine as viewed from the non-direct connection side, FIG. (B) is the partially notched schematic sectional drawing of the side surface.
FIG. 3 is a schematic cross-sectional view showing an example of a conventional cooling device for a rotating electrical machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Outer frame 2 Rotor shaft 2A Ventilation port 3 Rotor core 4 Cooling fan 5 Partition member 6 Heat exchanger 7 Stator core 8 Cooling fan 9 Ventilation duct 10 Intake cover 11 Exhaust cover 14 Sound insulation plate 15 Air inlet 16 Ventilation channel inner surface 17 Ventilation channel outer surface 18 Anti-direct-connection side wall surface 20 Sound absorbing material

Claims (6)

Cooling air cooled by a heat exchanger at the top of the rotating electrical machine body is circulated inside the rotating electrical machine body to cool the interior of the rotating electrical machine body, and air is supplied to the heat exchanger from outside the rotating electrical machine. In a cooling device for a rotating electrical machine that discharges air that has been heat-exchanged by a heat exchanger to the outside, an air suction port that sucks in air from outside the rotating electrical machine, and an outside that is taken in from the air suction port comprising of the cooling fan for supplying air to the heat exchanger, and a sound insulation plate of a cone shape formed on the inner and outer surfaces of the air passage between leading to the cooling fan inlet from the air inlet, the air A cooling device for a rotating electrical machine, wherein the ventilation area of the ventilation path between the suction port and the cooling fan inlet is not changed . 2. The cooling device for a rotating electrical machine according to claim 1, wherein the sound insulating plate is a polygonal pyramid instead of the conical sound insulating plate. The cooling device for a rotating electric machine according to claim 1, wherein a sound insulating material is attached to the conical sound insulating plate. The cooling device for a rotating electrical machine according to claim 2, wherein a sound insulating material is attached to the sound insulating plate having a polygonal pyramid shape. 4. The cooling for a rotating electrical machine according to claim 1, wherein a diameter of a bottom surface of the conical sound insulating plate attached to an inner surface of the ventilation passage is formed larger than a diameter of a suction port of the cooling fan. apparatus. 5. The rotation according to claim 2, wherein a minimum width of a bottom surface of the polygonal pyramid-shaped sound insulating plate attached to an inner surface of the ventilation path is formed to be larger than a suction port diameter of the cooling fan. Electric cooling device.

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