JP2020129897A - Totally-enclosed fan-cooled type rotary electric machine and external fan cover - Google Patents

Abstract

To reduce noises of a totally-enclosed fan-cooled type rotary electric machine without reducing the cooling performance thereof.SOLUTION: The totally-enclosed fan-cooled type rotary electric machine comprises: a rotor having a rotor shaft and a rotor core; a stator; a frame; a coupling side bearing and a reverse coupling side beating; a coupling side bearing bracket and a reverse coupling side bearing bracket; a cooler having a plurality of cooling tubes and a cooler cover; an external fan which is attached to an axially outside of a bearing of the rotor shaft and supplies an outside air to an inside of each cooling tube; and an external fan cover 80. The external fan cover 80 includes: a cover plate 81 formed to cover the outside of the external fan; and a division guide that divides a space surrounded with the cover plate 81 into an external fan inlet space and an external fan output space, and covers the external fan. An outside air intake hole 82 is formed only in a portion of the cover plate 81 where the cover plate 81 is not opposite to the external fan. In the division guide, a suction opening introducing the outside air to the external fan is formed, and is communicated with the plurality of cooling tubes.SELECTED DRAWING: Figure 5

Description

The present invention relates to a fully-enclosed outer fan type rotating electric machine and an outer fan cover thereof.

The totally enclosed fan-type rotating electric machine includes a rotor, a stator, a frame that houses the rotor core and the stator, and a cooler and an external fan. The outer fan is usually provided at one end (anti-coupling side) of the rotor shaft of the rotor. The outside air driven by the external fan flows into the cooling pipe through one opening of each of the cooling pipes extending in the axial direction of the cooler and flows out through the other opening.

In the totally enclosed fan-type rotating electric machine, the frame and the cooler cover form a closed space. The cooling pipe penetrates through this closed space, and the outside of the cooling pipe is the atmosphere of the closed space. Normally, a cooling gas such as air circulates in this closed space.

The outside air passing through the inside of the cooling pipe cools the cooling gas outside the cooling pipe. The cooling gas cools the rotor core, the stator core, the stator winding, and the like.

JP-A-7-213018 JP, 9-275663, A

The outside air that flows in the cooling pipe to cool the cooling gas flows in from an outside air intake port provided in the outer fan cover, and is pressure-fed to the cooling pipe by the outer fan in the outer fan cover.

Here, as the flow rate of the outside air increases, the cooling capacity of the cooler increases, but the noise due to the flow of the outside air also increases. Causes of noise include wind noise caused by an external fan and noise caused when the outside air collides with a tube plate when flowing into a cooling pipe. When the rotating electric machine is a two-pole machine, the rotation speed of the rotor shaft is particularly large, so that the rotation speed of the outer fan is large and the wind noise caused by the outer fan is large. Therefore, it is necessary to suppress the noise to a predetermined value or less.

As a technique for reducing noise, a technique that devises a flow path that leads from the outer side of the outer fan to the cooler (see Patent Document 1) or a technique that causes a jet fan action on the discharge side of the outer fan (Patent Document 1) (See Reference 2). All of these examples relate to the flow path on the downstream side of the external fan, and the structure inside the external fan cover becomes complicated.

Therefore, an object of the present invention is to reduce noise without lowering the cooling capacity of the fully enclosed fan-type rotary electric machine.

In order to achieve the above-mentioned object, a fully-closed fan-type rotary electric machine according to the present invention includes a rotor shaft that extends in a rotation axis direction and is rotatably supported, and a rotor core that is provided radially outside the rotor shaft. A rotor having, a stator having a cylindrical stator core provided radially outside the rotor core, and a stator winding penetrating the inside of the stator core in the rotation axis direction, A frame arranged outside the stator in the radial direction to accommodate the rotor core and the stator, and a coupling-side bearing that supports the rotor shaft on both sides in the rotation axis direction with the rotor core interposed therebetween. And an anti-coupling side bearing, a coupling side bearing bracket and an anti-coupling side bearing bracket that statically support each of the coupling side bearing and the anti-coupling side bearing and connect to both sides of the frame in the rotation axis direction, and the rotation shaft. A plurality of cooling pipes extending in the direction and arranged in parallel with each other, and a cooler cover that houses the plurality of cooling pipes and forms a closed space together with the frame, the coupling side bearing bracket and the anti-coupling side bearing bracket, A cooler having an outer fan, an outer fan attached to an outer side of the rotor shaft in the axial direction of the anti-coupling side bearing to supply outside air into the plurality of cooling pipes, and formed to cover the outer fan. And an outer fan cover having a split guide that divides the space surrounded by the cover plate into an outer fan inlet space and an outer fan outlet space, and faces the outer fan of the cover plate. The outside air intake hole is formed only in the non-exposed portion, the split guide is arranged so as to cover the outside fan, and the suction opening is formed to introduce the outside air flowing from the outside air intake hole into the outside fan. It communicates with the cooling pipe of.

Further, an outer fan cover according to the present invention includes a rotor having a rotor shaft extending in a rotation axis direction and rotatably supported, and a rotor core provided on a radially outer side of the rotor shaft. A stator having a cylindrical stator core provided radially outside the child core, and a stator winding that penetrates the inside of the stator core in the rotation axis direction, and the outside of the stator in the radial direction. A frame that stores the rotor core and the stator, and a coupling-side bearing and an anti-coupling-side bearing that support the rotor shaft on both sides in the rotation axis direction with the rotor core interposed therebetween; A coupling-side bearing bracket and an anti-coupling-side bearing bracket that statically support each of the coupling-side bearing and the anti-coupling-side bearing and connect to both sides of the frame in the rotation axis direction, and extend in the rotation axis direction and are arranged in parallel with each other. A plurality of cooling pipes, and a cooler cover that houses the plurality of cooling pipes and forms a closed space together with the frame, the coupling side bearing bracket and the anti-coupling side bearing bracket, and the rotor. An external fan cover for a fully-closed external fan type rotating electric machine, comprising: an external fan that is attached to an outer side of a shaft in the axial direction of the anti-coupling side bearing and supplies external air to the insides of the plurality of cooling pipes. The cover includes a cover plate formed to cover the outside of the external fan, and a division guide that divides a space surrounded by the cover plate into an external fan inlet space and an external fan outlet space, An outside air intake hole is formed only in a portion of the cover plate that does not face the outside fan, the split guide is arranged so as to cover the outside fan, and the outside air introduced from the outside air intake hole is introduced into the outside fan. An opening is formed and communicates with the plurality of cooling pipes.

According to the present invention, it is possible to reduce noise without lowering the cooling capacity of the totally enclosed fan-shaped rotary electric machine.

FIG. 3 is a vertical cross-sectional view showing a configuration of a fully-enclosed outer fan type rotary electric machine according to the embodiment. FIG. 2 is a sectional view taken along the line II-II of FIG. 1 showing the configuration of the outer fan cover of the fully enclosed outer fan type rotating electric machine according to the embodiment. FIG. 3 is a lateral cross-sectional view taken along the line III-III of FIG. 2 showing the configuration of the outer fan cover of the totally enclosed outer fan type rotary electric machine according to the embodiment. FIG. 4 is a sectional view taken along the line IV-IV of FIG. 3 showing the configuration of the outer fan cover of the totally enclosed outer fan type rotating electric machine according to the embodiment. FIG. 5 is a vertical cross-sectional view taken along the line VV of FIG. 3 showing the configuration of the outer fan cover of the fully-closed outer fan type rotating electric machine according to the embodiment. FIG. 4 is a plan view taken along the line VI-VI of FIG. 3 showing a configuration of an outer fan cover of the totally enclosed outer fan type rotary electric machine according to the embodiment. FIG. 4 is a conceptual plan cross-sectional view for explaining the effect of the outer fan cover of the totally enclosed outer fan type rotating electric machine according to the embodiment.

Hereinafter, a fully-closed outer fan type rotating electric machine and an outer fan cover according to an embodiment of the present invention will be described with reference to the drawings. Here, parts that are the same or similar to each other are designated by common reference numerals, and redundant description will be omitted.

FIG. 1 is a vertical cross-sectional view showing a configuration of a fully-closed outer fan-shaped rotating electric machine according to an embodiment.

The fully-closed outer fan type rotating electrical machine 100 includes a rotor 10, a stator 20, a coupling side bearing 30a, an anti-coupling side bearing 30b, a frame 40, a cooler 60, and an outer fan 70.

The rotor 10 has a rotor shaft 11 extending in the longitudinal direction and a rotor core 12 attached to the rotor shaft 11. At one end of the rotor shaft 11, a coupling portion 11a for coupling with a coupling target is provided. The rotor shaft 11 is rotatably supported by the coupling side bearing 30a and the anti-coupling side bearing 30b on both sides sandwiching the rotor core 12.

Inner fans 51 are attached to portions between the respective bearings of the rotor shaft 11 and the rotor core 12.

The stator 20 has a cylindrical stator core 21 arranged on the outer side in the radial direction of the rotor core 12 with a gap, and a stator penetrating the stator core 21 in the axial direction at intervals in the circumferential direction. It has a child winding 22.

The frame 40 is arranged outside the stator 20 in the radial direction so as to surround the stator 20. The frame 40 has a tubular shape, and a coupling-side bearing bracket 45a and an anti-coupling-side bearing bracket 45b are attached to both ends of the frame 40, and the coupling-side bearing 30a and the anti-coupling-side bearing 30b are statically supported, respectively. doing.

A cooler 60 is provided above the frame 40. The cooler 60 includes cooling pipes 61 that are arranged in parallel with each other and linearly extend in the axial direction, and a cooler cover 63 that houses the cooling pipes 61. Both ends of the cooling pipe 61 pass through the end plates 62a and 62b in a state where they do not project, and are statically supported by the end plates 62a and 62b.

The frame 40, the coupling side bearing bracket 45a and the anti-coupling side bearing bracket 45b, the cooler cover 63, and the end plates 62a and 62b cooperate with each other to form a closed space 40a. The space inside the frame 40 and the space inside the cooler cover 63 communicate with each other through the cooler inlet opening 64 and the cooler outlet openings 65a and 65b. The cooler inlet opening 64 is formed above the stator 20, and the cooler outlet openings 65 a and 65 b are formed above the inner fan 51 as openings of the frame 40.

An external fan 70 is provided near the end of the rotor shaft 11 on the side opposite to the side where the coupling portion 11a is provided. Further, an outer fan cover 80 that accommodates the outer fan 70, guides the outer air to the outer fan 70, and guides the outer air from the outer fan 70 to the cooling pipe 61 is provided outside the outer fan 70.

The outer fan cover 80 has a cover plate 81, a division guide 83, and an inner guide 84.

The cover plate 81 and the division guide 83 form a space on the inlet side of the outer fan 70 in the flow of the outside air driven by the outer fan 70.

Further, the split guide 83, the inner guide 4, the anti-coupling side bearing bracket 45b, and the end plate 62b form a space on the outlet side of the outer fan 70 in the flow of the outside air driven by the outer fan 70.

FIG. 2 is a sectional view taken along the line II-II of FIG. 1 showing the configuration of the outer fan cover of the fully-closed outer fan type rotating electric machine according to the embodiment. 3 is a cross-sectional view taken along the line III-III of FIG. 2, FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 3, and FIG. 5 is a view taken along the line V-V of FIG. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG.

The cover plate 81 of the outer fan cover 80 is the outermost surface portion and is in contact with the outside air. The cover plate 81 has a rectangular parallelepiped outer shape, and includes a front cover plate 81a, two side cover plates 81b, an upper cover plate 81c, and a bottom cover plate 81d.

The front cover plate 81a faces the end plate 62b and the anti-coupling side bearing bracket 45b. As shown in FIG. 2 and the like, for example, a sound deadening member 81s such as a sponge may be attached to the inner surface of the front cover plate 81a, that is, the side opposite to the coupling side bearing bracket 45b. Further, the sound deadening member 81s may be attached to the side cover plate 81b and the upper cover plate 81c.

The bottom cover plate 81d forms the bottom of the cover plate 81 by connecting the bottom end of the front cover plate 81a and the bottom end of the anti-coupling side bearing bracket 45b. The upper cover plate 81c connects the top end of the front cover plate 81a and the top end of the end plate 62b to form the upper part of the cover plate 81. One end of each of the front cover plate 81a, the top cover plate 81c, and the bottom cover plate 81d is connected to one end cover plate 81b so as to connect to the end plate 62b and the anti-coupling side bearing bracket 45b. The same applies to the other side cover plate 81b.

Here, as shown in FIG. 5, a plurality of outside air intake holes 82 are formed in the two side cover plates 81b. In FIG. 5, the outside air intake hole 82 is formed in a region of the side cover plate 81b near the end plate 62b and the anti-coupling side bearing bracket 45b. Although the plurality of outside air intake holes 82 are arranged in a square lattice shape, the present invention is not limited to this. That is, for example, a staggered arrangement may be used.

The inner guide 84 is a truncated cone whose outer shape has a center in the axial direction, is located between the outer fan 70 and the anti-coupling side bearing 30b, is supported by the anti-coupling side bearing bracket 45b, and has a through hole for the rotor shaft 11. The inner guide 84 is, for example, half-split, and is formed so that it can be installed even after the outer fan 70 is attached.

The division guide 83 divides the space inside the cover plate 81 into an outer fan inlet space 80a and an outer fan outlet space 80b. The division guide 83 has a front guide plate 83a, a side guide plate 83b, an oblique guide plate 83c, and an upper guide plate 83d.

The front guide plate 83a is rectangular and stands upright so as to face the front cover plate 81a of the cover plate 81, and the lower end thereof contacts the upper surface of the bottom cover plate 81d of the cover plate 81. A circular suction opening 83h is formed near the center of the front cover plate 81a. From the suction opening 83h to the outer fan 70, a cylindrical suction guide 83g guides the outside air.

The oblique guide plate 83c has a rectangular shape, is joined to the upper end of the front guide plate 83a, and extends upward so as to be inclined toward the end plate 62b.

The upper guide plate 83d has a rectangular shape, is coupled to the upper end of the oblique guide plate 83c, extends horizontally toward the end plate 62b, and is in contact with the end plate 62b.

The lower half of the side guide plate 83b is rectangular, and is connected to the front guide plate 83a, the bottom cover plate 81d of the cover plate 81, and the anti-coupling side bearing bracket 45b. The plate 83c, the upper guide plate 83d, and the end plate 62b are combined to form an outer fan outlet space 80b.

The outer fan outlet space 80b is a space surrounded by the guide plate 83, the bottom plate cover plate 81d of the cover plate, the anti-coupling side bearing bracket 45b, and the end plate 62b, and passes through the openings at the respective ends of the cooling pipe 61 to cool the cooling pipe. 61, and also communicates with the outer fan outlet space 80b through the suction opening 83h of the outer fan 70 formed in the guide plate 83. Other than this, there is no part that communicates with the outside.

As shown in FIG. 5, a plurality of outside air intake holes 82 are formed in the side guide plate 83b. The area in which the outside air intake hole 82 is formed is an area near the side of the side guide plate 83b opposite to the anti-coupling side bearing bracket 45b and the end plate 62b. Note that, although FIG. 5 shows the case where the side guide plate 83b is formed in a region of about half in the lateral direction, if the degree of leakage of noise to the outside is not a problem, the front guide plate 83a is further provided. It may be extended to the side.

In the above, the case where the division guide 83 is composed of a plurality of plate materials has been shown as an example, but the present invention is not limited to this. For example, some or all of the plurality of plate materials may be replaced with curved plates.

Next, the operation of the fully-closed outer fan type rotating electric machine and the outer fan cover thereof according to the present embodiment will be described.

The inside of the aircraft will be described with reference to FIG. The cooling gas in the machine is driven by the two inner fans 51 toward the rotor core 12 and the stator 20 and, after cooling them, flows into the cooler 60 from the cooler inlet opening 64. The space between the guide plates 66a and 66b is cooled by the outside air flowing through the cooling pipe 61 while rising outside the cooling pipe 61. The cooling gas that has reached the upper communication space 67 is divided into a joining side and an anti-joining side.

The cooling gas separated into the coupling side is cooled while descending outside the cooling pipe 61 in the space between the end plate 62a and the guide plate 66a, and then distributed to the coupling side via the cooler outlet opening 65a. It flows again into the internal fan 51 that has been removed.

The cooling gas separated into the anti-coupling side is cooled while descending outside the cooling pipe 61 in the space between the end plate 62b and the guide plate 66b, and then passes through the cooler outlet opening 65b to the anti-coupling side. It again flows into the inner fan 51 arranged at.

Next, the flow of the outside air, which is the cooling medium flowing inside the cooling pipe 61, will be described with reference to FIG.

In FIG. 6, the flow of outside air is indicated by a white arrow. In the cover plate 81, the outside air intake hole 82 (FIG. 5) is formed only in the side cover plate 81b. In FIG. 6, an outside air intake hole 82 is formed below the H portion surrounded by a broken line.

The outside air that has flowed into the outside fan inlet space 80a from the outside air intake hole 82 goes around into the space between the front cover plate 81a and the front guide plate 83a, and then from the suction opening 83h formed in the front guide plate 83a. Flows into 70.

Here, in the space between the front cover plate 81a and the front guide plate 83a, the flow velocity of the outside air is sufficiently smaller than the flow velocity in the outside air intake hole 82, and the space between the front cover plate 81a and the front guide plate 83a is small. The pressure loss due to the flow of outside air in the space is small. Therefore, as compared with the case where the outside air intake hole is formed in the front cover plate 81a and the outside air directly flows into the outside fan from the front, the configuration of the outside fan cover 80 in the present embodiment reduces the air volume by the outside fan 70. The degree is almost negligible.

The outside air that has flown into the outer fan 70 flows into the outer fan outlet space 80b driven by the outer fan 70, and then flows into the cooling pipe 61 of the cooler 60.

FIG. 7 is a conceptual plan cross-sectional view for explaining the effect of the outer fan cover of the totally enclosed outer fan type rotary electric machine according to the embodiment.

The noise mainly occurs in the external fan 70, that is, the main sound source is the external fan. The outer fan 70 is surrounded by the guide plate 83, and the propagation of sound from the suction opening 83h to the outside serves as a main path of noise.

No opening is formed in the front cover plate 81a arranged in the direction in which the sound of the external fan 70 leaks through the suction opening 83h. Therefore, noise does not directly leak to the outside. Further, a sound deadening member 81s is attached to the front cover plate 81a, which further reduces sound leakage to the outside.

Further, the sound wave traveling toward the side cover plate 81b is reflected by the front cover plate 81a, but the amount of the sound wave reflected by the silencing member 81s attached to the front cover plate 81a is reduced. Therefore, the sound volume leaked from the outside air intake hole 82 formed in the side cover plate 81b as the only opening of the cover plate 81 can be suppressed to a sufficiently low level.

As described above, according to the present embodiment, it is possible to reduce noise without lowering the cooling capacity of the totally enclosed fan-shaped rotary electric machine.

[Other Embodiments]
Although the embodiments of the present invention have been described above, the embodiments are presented as examples and are not intended to limit the scope of the invention. For example, in the embodiment, the case of the horizontal rotating electric machine has been described as an example, but the case of the standing type may be used. Further, in the embodiment, the case where two inner fans are provided has been described as an example, but the case where one inner fan is provided may be used.

Further, in the embodiment, the case where the outside air intake hole for taking in the outside air is formed only in the side cover plate 81b of the cover plate 81 is shown, but the present invention is not limited to this. For example, the upper cover plate 81c may be provided with an outside air intake hole.

Furthermore, the embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. The embodiments and the modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and the gist of the invention.

10... Rotor, 11... Rotor shaft, 11a... Coupling part, 12... Rotor core, 20... Stator, 21... Stator core, 22... Stator winding, 30a... Coupling side bearing, 30b... Anti-coupling side Bearing, 40... Frame, 40a... Closed space, 45a... Coupling side bearing bracket, 45b... Anti-coupling side bearing bracket, 51... Inner fan, 60... Cooler, 61... Cooling pipe, 62a, 62b... End plate, 63... Cooler cover, 64... Cooler inlet opening, 65a, 65b... Cooler outlet opening, 66a, 66b... Guide plate, 67... Upper communication space, 70... External fan, 80... External fan cover, 80a... External fan inlet space , 80b... Outer fan outlet space, 81... Cover plate, 81a... Front cover plate, 81b... Side cover plate, 81c... Top cover plate, 81d... Bottom cover plate, 81s... Muffling member, 82... Outside air intake hole, 83 ... split guide, 83a... front guide plate, 83b... side guide plate, 83c... oblique guide plate, 83d... upper guide plate, 83g... suction guide, 83h... suction opening, 84... inner guide, 100... fully closed fan-shaped Rotating electric machine

Claims (3)

A rotor having a rotor shaft that extends in the rotation axis direction and is rotatably supported, and a rotor core that is provided radially outside the rotor shaft.
A stator having a cylindrical stator core provided on the outer side in the radial direction of the rotor core, and a stator winding penetrating the inside of the stator core in the rotation axis direction,
A frame arranged radially outside the stator to accommodate the rotor core and the stator;
A coupling-side bearing and an anti-coupling-side bearing that support the rotor shaft on both sides in the rotation axis direction with the rotor core interposed therebetween,
A coupling-side bearing bracket and an anti-coupling-side bearing bracket that statically support each of the coupling-side bearing and the anti-coupling-side bearing and connect to both sides of the frame in the rotation axis direction,
A plurality of cooling pipes extending in the rotation axis direction and arranged in parallel with each other, and a cooler that houses the plurality of cooling pipes and forms a closed space together with the frame, the coupling side bearing bracket, and the anti-coupling side bearing bracket. A cooler having a cover,
An external fan that is attached to the outer side of the rotor shaft in the axial direction of the anti-coupling side bearing and supplies outside air to the inside of the plurality of cooling pipes,
An outer fan cover having a cover plate formed to cover the outside of the outer fan, and a split guide that divides a space surrounded by the cover plate into an outer fan inlet space and an outer fan outlet space,
Equipped with
An outside air intake hole is formed only in a portion of the cover plate that does not face the external fan,
The division guide is arranged so as to cover the outer fan, and a suction opening for introducing the outside air flowing in from the outside air intake hole into the outside fan is formed and communicates with the plurality of cooling pipes.
A fully-enclosed fan-type rotating electric machine characterized by that. The cover plate is
A front cover plate facing the external fan;
Two side cover plates,
An upper cover plate coupled to the upper ends of the front cover plate and the upper ends of the two side cover plates;
Have
The fully-closed fan-type rotary electric machine according to claim 1, wherein the outside air intake hole is formed in any of the two side cover plates and the upper cover plate. A rotor having a rotor shaft that extends in the rotation axis direction and is rotatably supported, and a rotor core that is provided radially outside the rotor shaft.
A stator having a cylindrical stator core provided on the outer side in the radial direction of the rotor core, and a stator winding penetrating the inside of the stator core in the rotation axis direction,
A frame arranged radially outside the stator to accommodate the rotor core and the stator;
A coupling-side bearing and an anti-coupling-side bearing that support the rotor shaft on both sides in the rotation axis direction with the rotor core interposed therebetween,
A coupling-side bearing bracket and an anti-coupling-side bearing bracket that statically support each of the coupling-side bearing and the anti-coupling-side bearing and connect to both sides of the frame in the rotation axis direction,
A plurality of cooling pipes extending in the rotation axis direction and arranged in parallel with each other, and a cooler that houses the plurality of cooling pipes and forms a closed space together with the frame, the coupling side bearing bracket, and the anti-coupling side bearing bracket. A cooler having a cover,
An external fan that is attached to the outer side of the rotor shaft in the axial direction of the anti-coupling side bearing and supplies outside air to the inside of the plurality of cooling pipes,
An external fan cover for a fully-enclosed external fan-type rotating electric machine comprising:
The outer fan cover is
A cover plate formed to cover the outside of the external fan;
A division guide that divides the space surrounded by the cover plate into an outer fan inlet space and an outer fan outlet space,
Equipped with,
An outside air intake hole is formed only in a portion of the cover plate that does not face the outside fan,
The split guide is arranged so as to cover the external fan, and a suction opening for introducing the external air flowing in from the external air intake hole into the external fan is formed and communicates with the plurality of cooling pipes.
An external fan cover that is characterized.

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