JP6013306B2 - Fully closed rotating electric machine - Google Patents

Description

  The present invention relates to a fully enclosed rotating electrical machine including an internal fan.

  A technique is known in which a frame is hermetically sealed in a rotating electric machine such as an electric motor, and air in the frame is circulated by an internal fan provided in the frame to cool the inside of the frame (for example, see Patent Document 1).

JP 2003-143809 A

  In a fully-enclosed rotary electric machine equipped with a conventional internal fan, the temperature in the frame is not uniform. In particular, when the rotating shaft becomes hot, the inner ring side of the bearing becomes hot, and the outer ring side of the bearing becomes relatively cold due to the influence of the external fan. I was out.

  The present invention has been made in order to address the problems of the prior art, and an object of the present invention is to alleviate temperature non-uniformity in a frame in a fully-closed rotating electrical machine having an internal fan.

In order to achieve the above object, a fully-closed rotating electrical machine according to the present invention includes a rotary shaft, a rotor fixed to the rotary shaft, and the rotary shaft at positions on both sides of the rotor in the axial direction. First and second bearings that are rotatably supported, a stator disposed so as to surround a radially outer side of the rotor, and the rotor and the stator are hermetically covered, and the rotating shaft penetrates A fully-enclosed rotary electric machine having a cylindrical frame that is fixed to the rotary shaft within the frame, wherein the frame seals the first end in the axial direction and A first bracket supporting a first bearing, wherein the internal fan is between the first bracket and a first end in the axial direction of the rotor on the side close to the first bracket. Arranged axially from the first end in the axial direction of the rotor A plurality of radiation passage portions for guiding air outward and radially outward, and at least projecting in an axial direction toward the first bracket adjacent to a side of the radiation passage portion close to the first bracket A blade portion that disturbs and mixes the air around the first bearing to equalize the temperature inside and outside the first bearing, and the blade portion A plurality of blade-like blade portions that are spaced apart from each other in the direction and extend in the radial direction, wherein the rotation shaft passes through the first bracket, and the rotation shaft is located outside the first bracket. An external fan that is fixed to the external fan, and an air guide portion that covers the external fan and includes an air inlet, and the outside air that is introduced into the air guide portion through the air inlet is formed in the first bracket. Pass outside, then the radius of the frame Be configured so as to be directed axially along the cooling fins provided on the direction outward, characterized by.

  According to the present invention, in a fully-closed rotating electrical machine including an internal fan, temperature unevenness in the frame can be alleviated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an embodiment of a fully-closed rotating electrical machine according to the present invention, and shows a cross section of the upper half and the vicinity of both axial ends. It is a front view which takes out and shows the internal fan of one Embodiment of the fully-closed rotary electric machine of FIG. 1, Comprising: It is a figure which shows an upper half part with a cross section. FIG. 3 is a partial side view in the direction of arrow III in FIG. 2.

  Hereinafter, an embodiment of a fully-closed rotating electrical machine according to the present invention will be described with reference to the drawings.

  FIG. 1 is a front view of an embodiment of a fully-closed rotating electrical machine according to the present invention, and shows a cross section of the upper half and the vicinity of both ends in the axial direction. FIG. 2 is a front view showing an internal fan extracted from the embodiment of the fully-closed rotating electrical machine of FIG. 1 and showing the upper half in section. FIG. 3 is a partial side view in the direction of arrow III in FIG.

  The fully-closed rotating electrical machine of the present embodiment includes a rotating shaft 10 extending in the horizontal direction and a rotor 11 fixed to the rotating shaft 10. The rotating shaft 10 is rotatably supported by a first bearing 12 and a second bearing 13, and the rotor 11 is sandwiched between the first bearing 12 and the second bearing 13.

  A stator 14 is arranged on the outer side in the radial direction of the rotor 11, and a radial gap 15 is formed between the rotor 11 and the stator 14. A cylindrical frame 16 is disposed so as to cover the rotor 11 and the stator 14, and the stator 14 is fixed to the frame 16. The frame 16 includes a first bracket 17 and a second bracket 18, and a first end portion in the axial direction of the frame 16 is closed by the first bracket 17, and a second end portion in the axial direction of the frame 16. The part is closed by a second bracket 18.

  The first bearing 12 is supported by a first bracket 17, and the second bearing 13 is supported by a second bracket 18. The rotating shaft 10 extends through the first bracket 17 and the second bracket 18, and a tip that penetrates the second bracket 18 is a load side tip 30.

  The first bearing 12 and the second bearing 13 are rolling bearings in the illustrated example. For example, the first bearing 12 is sandwiched between the inner ring 12a, the outer ring 12b, the inner ring 12a, and the outer ring 12b. And a plurality of metal balls 12c that roll.

  In the frame 16, an internal fan 19 is attached to the rotary shaft 10 at a position between the first bearing 12 and the rotor 11. The internal fan 19 is formed with a plurality of radiation passage portions 20 that gradually go outward in the radial direction from the axial end portion of the rotor 11 toward the first bracket 17. A plurality of the radiation passage portions 20 are arranged in the circumferential direction, and the air that flows in or around the rotor 11 by the centrifugal force acting on the air in the radiation passage portion 20 by the rotation of the rotating shaft 10 is the first. An air flow is formed toward the outer periphery of the bracket 17.

  A plurality of plate-like blade portions 21 are provided near the outer periphery of the radiation passage portion 20 near the first bracket 17. Each blade portion 21 protrudes in the axial direction toward the first bracket 17 and extends in the radial direction, and is arranged at an interval in the circumferential direction.

  A plurality of cooling fins 22 extending in the axial direction are formed on the outer surface of the cylindrical portion extending in the axial direction of the frame 16.

  An external fan 23 is attached to the outside of the first bracket 17 of the rotating shaft 10. An air guide 24 is attached so as to cover the outside of the external fan 23 and the outside of the first bracket 17. An air inlet 25 is formed in the air guide portion 24. The external fan 23 is rotated by the rotation of the rotating shaft 10, and the outside air is taken into the air guide portion 24 through the intake port 25 and sent out along the cooling fins 22 on the outer surface of the cylindrical portion of the frame 16.

  The internal fan 19 is rotated by the rotation of the rotating shaft 10. As a result, due to the centrifugal force acting on the air in the plurality of radiation passage portions 20, the air that has flowed inside or around the rotor 11 is formed toward the outer periphery of the first bracket 17. Thereby, the inside air in the frame 16 circulates. The internal air in the frame 16 is cooled by exchanging heat with the external air by the cooling fins 22 formed on the outer wall of the frame 16.

  Here, the inner ring 12 a of the first bearing 12 is heated to a relatively high temperature as heat is transmitted from the rotary shaft 10. On the other hand, when the outside of the first bracket 17 is cooled by the external fan 23, the outer ring 12b has a lower temperature than the inner ring 12a. However, since the blade portion 21 of the internal fan 19 is provided, the air around the first bearing 12 is disturbed and mixed, so that the uneven temperature of the first bearing 12 is alleviated.

  As mentioned above, although embodiment of this invention was described, this embodiment is shown as an example and is not intending limiting the range of invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 ... Rotating shaft 11 ... Rotor 12 ... First bearing 12a ... Inner ring 12b ... Outer ring 12c ... Metal ball 13 ... Second bearing 14 ... Stator 15 ... Gap 16 ... Frame 17 ... First bracket 18 ... First 2 brackets 19 ... internal fan 20 ... radiation passage part 21 ... blade part 22 ... cooling fin 23 ... external fan 24 ... air guide part 25 ... air inlet 30 ... load side tip

Claims (1)

A rotation axis;
A rotor fixed to the rotating shaft;
First and second bearings rotatably supporting the rotating shaft at positions on both sides of the rotor in the axial direction;
A stator arranged to surround a radially outer side of the rotor;
A cylindrical frame that hermetically covers and covers the rotor and the stator;
An internal fan fixed to the rotating shaft in the frame;
A fully-enclosed rotary electric machine having
The frame includes a first bracket for sealing the first axial end thereof to support the first bearing;
The internal fan is
An axial direction from the first end portion in the axial direction of the rotor that is disposed between the first bracket and the first end portion in the axial direction of the rotor on the side close to the first bracket. A plurality of radiation passage portions for guiding air outward and radially outward;
At least one blade portion protruding in an axial direction toward the first bracket adjacent to a side of the radiation passage portion close to the first bracket, and disturbs air around the first bearing; A blade portion for mixing and achieving uniform temperature inside and outside of the first bearing ;
Have
The blade portion includes a plurality of plate-like blade portions that are arranged at intervals in the circumferential direction and extend in the radial direction,
The rotating shaft passes through the first bracket;
An external fan fixed to the rotating shaft outside the first bracket;
An air guide section that covers the external fan and has an air inlet;
Further comprising
The outside air introduced into the air guide through the air intake port passes through the outside of the first bracket, and then goes in the axial direction along cooling fins provided on the radially outer side of the frame. is being done,
A fully-enclosed rotating electrical machine.

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