JPH11275812A - Frame cooling fin structure of finned cooling motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the occurrences of pressure loss, turbulence and diffusion for enhancement of cooling efficiency. SOLUTION: A large number of fins 2 are formed on the circumferential surface of a frame 1 of a motor. The fins 2 are extended in the axial direction at a plurality of places in the circumferential direction. A swirling flow A produced by the rotation of a fan is guided by an outer cover 7 to enter into fin inlet portions 2a, 2b which are located at ends of the fins 2, and flow go between the fins 2 in the axial direction. The fin inlet portion 2a is long, and the fin inlet portion 2b is made short, so that the fins are arranged in the so- called 'staggered pattern'. Consequently, the space between the discharge portion 7b of the outer cover 7 and the fin inlet portions 2a, 2b becomes wide, and the distribution resistance is reduced and the amount of inflowing air is increased, and the cooling efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame cooling fin structure of a fold cooling electric motor, which is devised so as to reduce pressure loss of cooling air and improve cooling efficiency.

[0002]

2. Description of the Related Art A conventional fold cooling motor will be described with reference to FIG. 8 which is a perspective view, FIG. 9 which is a detailed sectional view, and FIG. 10 which is a sectional view mainly showing a cooling structure. As shown in these figures, in the fold cooling electric motor, a large number of fins 2 extending in the axial direction are formed at a plurality of positions extending in the circumferential direction on the outer peripheral surface of the frame 1. Also, the brackets 3a, 3
Among b, a plurality of fins 4 extending in the radial direction are also formed on the outer peripheral surface of the bracket 3b on the directly connected side (the right side in the figure). That is, each fin 4 is radially arranged and formed when viewed from the shaft 5.

[0003] A fan 6 is mounted on the opposite side (left side in the figure) of the shaft 5, and the fan 6 is mounted on the shaft 5 at a position outside the bracket 3 a with respect to the axial position. It is surrounded by an outer cover 7. An intake hole is formed in the end face 7 a of the outer cover 7. The discharge portion 7b of the outer cover 7 is open and has a larger diameter than the frame 1 and surrounds the outer periphery of the left side of the frame 1.

FIG. 10 shows the outer peripheral surface of the frame 1.
There is a step in the portion indicated by 1a in FIG. Further, in each figure, 8 is a rotor, 9 is a stator, and 10 is a cover.

In the fold cooling motor having the above-described structure, the fan 6 is rotated by the rotation of the motor (the rotation of the shaft 5). As a result of the rotation of the fan 6, the air taken in from the intake hole of the end face 7a of the outer cover 7 is blown by the fan 6 and guided (guided) by the outer cover 7 as shown in FIG. 7a is sent out toward the fin 2 on the outer periphery of the frame 1. The sent air (cooling air) flows between the fins 2 on the outer peripheral surface of the frame 1 in the axial direction, and partly flows between the fins 4. In other words, cooling is performed by flowing from the non-direct connection side (left side) to the direct connection side (right side) on the outer peripheral surface of the frame 1.

[0006]

However, the above prior art has the following problems. (1) As shown in FIG. 11, in the space X between the discharge portion 7b of the outer cover 7 and the inlet portion of the fin 2 (the side opposite to the direct connection), the ventilation area is rapidly reduced, so that the wind speed of the cooling air is reduced. Rises and pressure loss (pressure loss) occurs.

(2) As shown in FIG. 12, the swirling flow A generated by the fan 6 is
, A turbulent flow B is generated. This turbulence B
As a result, a pressure loss occurs, or the air becomes a diffusion flow C and diffuses to the outer peripheral side of the frame 1.

(3) Due to the pressure loss, turbulence and diffusion caused by (1) and (2) above, the cooling air cannot be efficiently guided between the fins 2 and the cooling efficiency has been reduced.

SUMMARY OF THE INVENTION In view of the above prior art, an object of the present invention is to provide a frame cooling fin structure of a pleated cooling motor capable of improving the cooling efficiency by reducing the occurrence of pressure loss, turbulence and diffusion. .

[0010]

According to the structure of the present invention which solves the above-mentioned problem, a large number of fins extending in the axial direction are formed at a plurality of positions extending in the circumferential direction on the outer peripheral surface of the frame.
A fan mounted on the shaft at a position outside one of the brackets with respect to the axial position, and a fan that surrounds the fan and guides cooling air generated by the fan toward the outer fins of the frame. And a cover, wherein the axial position of the fin inlet portion of each of the fins located on the fan side is staggered in the axial direction alternately with respect to the circumferentially adjacent fin inlet portion. It is characterized by being arranged in a shape.

According to the structure of the present invention, a large number of fins extending in the axial direction are formed at a plurality of positions along the circumferential direction on the outer peripheral surface of the frame, and the fins are located at positions outside the one bracket with respect to the axial direction. A folding fan attached to a shaft, and an outer cover surrounding the fan and guiding cooling air generated by the fan toward the fins on the outer periphery of the frame; Of the fin entrance portions located on the fan side among the fins, the fin entrance portions for every predetermined number in the circumferential direction are notched.

Also, in the structure of the present invention, a large number of fins extending in the axial direction are formed at a plurality of positions along the circumferential direction on the outer peripheral surface of the frame, and the fins are located outside the one bracket with respect to the axial position. A folding fan attached to a shaft, and an outer cover surrounding the fan and guiding cooling air generated by the fan toward the fins on the outer periphery of the frame; The fin entrance portion located on the fan side among the fins is characterized in that it has a shape obliquely inclined with respect to the circumferential direction or an arc shape.

Further, according to the structure of the present invention, a large number of fins extending in the axial direction are formed at a plurality of positions along the circumferential direction on the outer peripheral surface of the frame, and the fins are located at positions outside the one bracket with respect to the axial position. A folding fan attached to a shaft, and an outer cover surrounding the fan and guiding cooling air generated by the fan toward the fins on the outer periphery of the frame; The axial positions of the fin inlet portions located on the fan side of the fins are alternately arranged in a staggered manner in the axial direction with respect to the circumferentially adjacent fin inlet portions. The fin entrance part, which is longer in the axial direction because of the staggered arrangement, has a shape or an arc that is obliquely inclined with respect to the circumferential direction. And butterflies.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. In each of the embodiments described below, only essential parts of the present invention are shown, and a general part as a fold cooling motor (the same constituent part as the conventional one)
Is omitted.

FIGS. 1 and 2 show a frame cooling fin structure of a pleated cooling motor according to a first embodiment of the present invention. In this embodiment, the fin length is alternately arranged. More specifically, among the fins 2, the fin entrance portions 2a and 2b located on the fan side (the left side in the figure) are arranged in a staggered manner in which the axial positions are alternately shifted. That is,
Each fin inlet portion 2a is arranged at the same axial position as the conventional one, but the fin inlet portion 2b circumferentially adjacent to each fin inlet portion 2a is
It is located at a position shorter than “a” and shifted in the axial direction to the directly connected side (right side in the figure).

As described above, since the fin entrance portion 2b is short, the sudden reduction of the ventilation area in the space between the discharge portion 7b of the outer cover 7 and the fin entrance portions 2a and 2b is reduced. The collision of the swirling flow A with the fins can be reduced. For this reason, it is possible to prevent pressure loss at the fin inlet portions 2a and 2b, generation of turbulence, and diffusion of cooling air to the outer periphery of the frame. As a result, the amount of cooling air flowing between the fins can be increased, and the cooling efficiency of the electric motor can be improved.

Further, the fin inlet portions 2a, 2
The noise at b can be reduced.

FIGS. 3 and 4 show a frame cooling fin structure of a fold cooling motor according to a second embodiment of the present invention. In this embodiment, the fins are arranged alternately in size. More specifically, of the fins 2 of the fin entrance portions 2c and 2d located on the fan side (the left side in the figure) of the fins 2,
Each fin entrance portion 2c is formed in the same size as the conventional one, but the fin entrance portion 2d circumferentially adjacent to each fin entrance portion 2c has a small area by cutting off the tip (left side). Has become.

As described above, since the fin inlet portion 2d is cut out to have a small area, the discharge portion 7 of the outer cover 7 is formed.
In the space between b and the fin inlet portions 2c and 2d, the sudden reduction of the ventilation area can be reduced, and the collision of the swirling flow A with the fins can be reduced. Therefore, the fin entrance portion 2
Pressure loss at c and 2d, generation of turbulence, and diffusion of cooling air to the outer periphery of the frame can be prevented. As a result,
By increasing the amount of cooling air flowing between the fins, the cooling efficiency of the electric motor can be improved.

Further, the fin entrance portions 2c, 2
The noise at d can be reduced. In the second embodiment, the fins 2d are notched one by one. However, the fins jumped a plurality of times may be cut out.

FIGS. 5 and 6 show a frame cooling fin structure of a pleated cooling motor according to a third embodiment of the present invention. In this embodiment, the fin entrance portion 2e located on the fan side (left side in the figure) of each fin 2 is formed in an arc shape obliquely inclined with respect to the circumferential direction.

As described above, since the fin inlet portion 2e is formed in an arc shape obliquely inclined with respect to the circumferential direction, the swirling flow A is guided by the arc-shaped fin inlet portion 2e,
Since the cooling air flows well between the fins 2, the amount of cooling air flowing between the fins can be increased to improve the cooling efficiency of the electric motor.

Further, noise at the fin entrance portion 2e due to the ventilation can be reduced. The same effect can be obtained by merely inclining the fin entrance portion 2e obliquely in the circumferential direction without bending the fin entrance portion 2e (or simply bending the fin entrance portion 2e linearly). In this embodiment (FIGS. 5 and 6), the rotation direction of the fan is limited to one direction.

FIG. 7 shows a frame cooling fin structure of a pleat cooling motor according to a fourth embodiment of the present invention. In this embodiment, the axial positions of the fin entrance portions 2f and 2g located on the fan side (the left side in the figure) of the fins 2 are alternately arranged in a staggered manner. In other words, each fin inlet portion 2f is disposed at the same axial position as the conventional one, but the fin inlet portion 2g circumferentially adjacent to each fin inlet portion 2f is shorter than the fin inlet portion 2f. It is arranged at a position where the axial position is shifted to the directly connected side (the right side in the figure). Further, each fin entrance portion 2f
It is formed in an arc shape obliquely inclined with respect to the circumferential direction.

As described above, since the fin inlet portion 2g is shorter, the sudden reduction of the ventilation area in the space between the discharge portion 7b of the outer cover 7 and the fin inlet portions 2f and 2g is reduced. The collision of the swirling flow A with the fins can be reduced. Therefore, it is possible to prevent pressure loss at the fin inlet portions 2f, 2g, generation of turbulence, and diffusion of cooling air to the outer periphery of the frame. As a result, the amount of cooling air flowing between the fins can be increased, and the cooling efficiency of the electric motor can be improved.

Since the fin inlet portion 2f is formed in an arc shape obliquely inclined with respect to the circumferential direction, the swirling flow A
Is guided by the arc-shaped fin inlet portion 2f and flows well between the fins 2, so that the amount of cooling air flowing between the fins can be increased, and the cooling efficiency of the electric motor can be improved.

Further, the fin inlet portions 2f, 2
g can be reduced.

[0028]

As described above in detail with the embodiments, in the present invention, the axial position of the fin inlet portion is
The fin inlet portions are alternately arranged in a staggered manner in the axial direction with respect to the adjacent fin inlet portions in the circumferential direction, or the fin inlet portions are cut out of the fin inlet portions every predetermined number in the circumferential direction. For this reason, a sudden reduction in the ventilation area in the space between the discharge portion of the outer cover and the fin inlet portion is reduced, and pressure loss at the fin inlet portion, generation of turbulence, and cooling air around the frame are reduced. Can be prevented. As a result, the amount of cooling air flowing between the fins can be increased, and the cooling efficiency of the electric motor can be improved.

Further, since the fin inlet portion has a shape or an arc that is obliquely inclined with respect to the circumferential direction, the swirling flow (cooling air) is guided by the fin inlet portion and flows well between the fins. Therefore, the amount of cooling air flowing between the fins can be increased, and the cooling efficiency of the electric motor can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing the first embodiment of the present invention from the front side.

FIG. 3 is a perspective view showing a second embodiment of the present invention.

FIG. 4 is a configuration diagram showing a second embodiment of the present invention from the front side.

FIG. 5 is a perspective view showing a third embodiment of the present invention.

FIG. 6 is a configuration diagram showing a third embodiment of the present invention from the front side.

FIG. 7 is a configuration diagram showing a fourth embodiment of the present invention from the front side.

FIG. 8 is a perspective view showing a fold cooling motor.

FIG. 9 is a sectional view showing a fold cooling motor.

FIG. 10 is a sectional view showing a fold cooling motor.

FIG. 11 is a sectional view showing a fin inlet portion of the fold cooling motor.

FIG. 12 is a perspective view showing a fin inlet portion of the fold cooling motor.

[Explanation of symbols]

1 Frame 2 Fin 2a, 2b, 2c, 2d, 2e, 2f, 2g Fin entrance 3a, 3b Bracket 4 Fin 5 Shaft 6 Fan 7 Outer cover 7a End face 7b Discharge part 8 Rotor 9 Stator 10 Cover

Claims (4)

[Claims] A large number of fins extending in the axial direction are formed at a plurality of positions along the circumferential direction on the outer peripheral surface of the frame, and are attached to the shaft at a position outside one of the brackets with respect to the axial direction. A rotating fan, and cooling air generated by the fan surrounding the fan.
An outer cover that guides the fins toward the outer fins of the frame, wherein the fin inlet portion of each of the fins that is located on the fan side has a fin that is adjacent in the circumferential direction. A frame cooling fin structure for a pleated cooling motor, wherein the frame cooling fin structure is arranged in a staggered manner so as to be displaced in the axial direction alternately with respect to an inlet portion. 2. A large number of fins extending in the axial direction are formed on the outer peripheral surface of the frame at a plurality of locations in the circumferential direction, and are attached to the shaft at a position outside one of the brackets with respect to the axial position. A rotating fan, and cooling air generated by the fan surrounding the fan.
An outer cover that guides the fins toward the outer fins of the frame. A frame cooling fin structure for a crease cooling motor, wherein an inlet portion is cut away. 3. A large number of fins extending in the axial direction are formed on the outer peripheral surface of the frame at a plurality of positions in the circumferential direction, and are attached to the shaft at a position outside one of the brackets with respect to the axial direction. A rotating fan, and cooling air generated by the fan surrounding the fan.
An outer cover for guiding toward the fins on the outer periphery of the frame, wherein the fin inlet portion of each of the fins located on the fan side has a shape or a circle obliquely inclined with respect to a circumferential direction. A frame cooling fin structure of a fold cooling electric motor characterized by having an arc shape. 4. A large number of fins extending in the axial direction are formed at a plurality of positions along the circumferential direction on the outer peripheral surface of the frame, and are attached to the shaft at a position outside one of the brackets with respect to the axial direction. A rotating fan, and cooling air generated by the fan surrounding the fan.
An outer cover that guides the fins toward the outer fins of the frame, wherein the fin inlet portion of each of the fins that is located on the fan side has a fin that is adjacent in the circumferential direction. The fin inlet portions that are arranged in a staggered manner and are alternately displaced in the axial direction with respect to the inlet portion, and the fin inlet portions of the fin inlet portions that are arranged in a staggered manner and that are longer in the axial direction are oblique to the circumferential direction. A frame cooling fin structure for a crease cooling motor, wherein the frame cooling fin structure has an inclined shape or an arc shape.