JP5497346B2 - Rotating electric machine cooling mechanism and rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine cooling mechanism and a rotating electrical machine including the mechanism.

  Some rotating electrical machines cool the inside of the rotating electrical machine by sucking outside air (air) and circulating it inside the machine. In general, the frame of a rotating electrical machine is formed with an opening (suction port) for sucking outside air and an opening (discharge port) for discharging air sucked from the suction port after circulating in the frame. ing.

  For example, as disclosed in Patent Document 1, air is circulated in the frame to cool the inside of the rotating electrical machine, and rotation is performed by taking outside air (gas refrigerant) by a cooling fan provided in the rotating electrical machine. A method of circulating inside the electric machine is known.

Japanese Patent No. 3047915

  The air sucked from the suction port first cools the bearing that supports the rotating shaft. Thereafter, the rotor and the stator are cooled and discharged from the discharge port. There are at least two bearings, that is, each of the load side and the anti-load side of the rotary shaft, and supports the rotary shaft.

  In order to initially cool each of the two bearings by the sucked air, it is necessary to provide at least two suction ports. In this case, a total of three openings are formed in the frame of the rotating electrical machine, including two suction ports and one discharge port.

  Piping equipment connected to each suction port and each discharge port is arranged outside the frame of the rotating electrical machine. When two suction ports are formed in the frame, for example, a pipe connected to the suction port needs to be branched, so that the configuration of the piping equipment may be complicated. When the configuration of the piping equipment becomes complicated, it is necessary to make a space for installing auxiliary equipment such as a rotating electrical machine and piping equipment wider.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to install the rotating electrical machine and its incidental equipment in a smaller space.

In order to achieve the above object, a rotating electrical machine cooling mechanism according to the present invention includes a rotating shaft that is rotatably supported by at least two bearings and extends horizontally, and is disposed between the two bearings and fixed to the rotating shaft. A rotor that rotates about the rotation axis, and a plurality of hollow disc-shaped steel plates that cover the rotor from the outside in the radial direction while maintaining a predetermined radial gap in the radial direction with respect to the rotor in the axial direction. Stacked steel plates and a hollow disk shape that covers the rotor from the outside in the radial direction while maintaining the radial gap, and is disposed adjacent to the steel plates in the axial direction so that the radially inner side and the outer side communicate with each other. In a rotating electrical machine cooling mechanism for cooling a rotating electrical machine with a gas medium, a stator having a stator formed so that a plurality of radial grooves are formed and alternately stacked in the axial direction. The mechanism of the stator A suction port that opens to the outside in the axial direction and capable of taking in the gas medium, and a discharge port that opens to the other axial direction outside of the stator and discharges the gas medium are formed one by one, A circulation fan configured such that at least the rotor and the stator are accommodated in the frame, and the gas medium taken in from the suction port circulates in the frame and is exhausted from the discharge port. And a part of the gaseous medium taken in from the suction port circulates in the frame toward the rotating shaft, and flows in the radial gap after flowing in the vicinity of one of the bearings. A first gas medium circulation system that circulates in one direction along the axial direction in the radial gap, passes through the radial groove from the radial gap, and is discharged from the discharge port; and the suction port From A part of the inserted gas medium is branched on the way to the rotating shaft and flows toward the rotating shaft after flowing in the one direction along the axial direction on the radially outer side of the stator. Then, after flowing in the vicinity of the other bearing, it flows into the radial gap, flows in the radial gap in the direction opposite to the one direction in the axial direction, and passes through the radial groove from the radial gap. A second gas medium circulation system that merges with the first gas medium circulation system and is discharged from the discharge port , and each of the second gas medium circulation systems has a radius of the stator. Two horizontal flow paths that circulate parallel to each other along the axial direction on the outer side in the direction, and between these two horizontal flow paths, the upward flow of the gaseous medium passing through the radial groove toward the circulation fan A path is formed and the two waters Each of the flat channels is provided with a heat insulating material for suppressing heat exchange with the ascending channel .

The rotating electrical machine according to the present invention is rotatably supported by at least two bearings and extends horizontally, and is disposed between the two bearings and is fixed to the rotating shaft so as to surround the rotating shaft. Rotating rotor, and a group of steel plates in which a plurality of hollow disk-shaped steel plates covering the rotor from the outside in the radial direction are laminated in the axial direction while maintaining a predetermined radial gap with the rotor in the radial direction And a plurality of radial grooves in the form of a hollow disk that covers the rotor from the outside in the radial direction while maintaining the radial gap, and are arranged adjacent to the steel plate group in the axial direction so that the inside and outside in the radial direction communicate with each other. been and the spacers, and the formed stator to alternately stacked in the axial direction, a suction port capable of incorporation an open air bodies medium in one axial direction outwardly of said stator, said stator Open to the outside in the other axial direction and discharge the gas medium Each of which has a discharge port and a frame formed so as to accommodate at least the rotor and the stator, and the gas medium taken in from the suction port circulates in the frame. A circulation fan configured to be exhausted from the discharge port, and the frame is configured such that a part of the gas medium taken in from the suction port circulates toward the rotation shaft, After flowing in the vicinity of the bearing, it flows into the radial gap, flows in the radial gap in one direction along the axial direction, passes through the radial groove from the radial gap, and is discharged from the discharge port. A part of the gas medium taken in from the suction port is branched on the way to the rotating shaft, and the radially outer side of the stator is axially extended along the axial direction. One way After flowing, it flows toward the rotating shaft, flows in the vicinity of the other bearing and then flows into the radial gap, and flows in the radial gap in the axial direction in the direction opposite to the one direction. A second gas medium circulation system that passes through the radial groove from the directional gap, joins with the first gas medium circulation system and is discharged from the discharge port, and forms the second gas medium circulation The system includes two horizontal flow paths that each flow in parallel with each other along the axial direction on the radially outer side of the stator, and between the two horizontal flow paths, the above-mentioned radial grooves pass through the radial grooves. An ascending channel is formed in which a gaseous medium is directed toward the circulation fan, and each of the two horizontal channels is provided with a heat insulating material for suppressing heat exchange with the ascending channel. .

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to install a rotary electric machine and its incidental equipment in a smaller space.

It is a schematic front view of the partially cutout of the rotating electrical machine according to the first embodiment of the present invention. It is a schematic front view of the notch of the rotary electric machine which concerns on the 2nd Embodiment of this invention. It is a schematic front view of the notch of the rotary electric machine which concerns on the 3rd Embodiment of this invention.

  Hereinafter, embodiments of a rotating electrical machine according to the present invention will be described with reference to the drawings.

[First Embodiment]
1st Embodiment which concerns on the rotary electric machine of this invention is described using FIG. FIG. 1 is a schematic front view of a partially cutout of the rotating electrical machine of the present embodiment.

  First, the configuration of the rotating electrical machine of the present embodiment will be described. The rotating electrical machine of this embodiment is fixedly disposed so as to cover a rotating shaft 10 that extends substantially horizontally, a rotor 11 that is fixed to the rotating shaft 10 and rotates around the rotating shaft 10, and covers the rotor 11 from the outside in the radial direction. And a frame 30 that accommodates at least the stator 20 and the rotor 11. The frame 30 and the circulation fan 12 that circulates the air in the frame 30 constitute a cooling mechanism that cools the rotating electrical machine.

  One end of the rotating shaft 10 is connected to a load. Although the illustration of the load is omitted in FIG. 1, the load is connected to the right side of the rotating shaft 10. The rotating shaft 10 is rotatably supported by two bearings (not shown) arranged on the load side and the anti-load side substantially horizontally with a space between each other. The rotor 11 is disposed so as to cover the rotating shaft 10 from the outside in the radial direction.

  The stator 20 is configured such that the steel plate groups 21 and the spacing plates 22 are alternately stacked in the axial direction. Each steel plate group 21 is configured by stacking a plurality of hollow disk-shaped steel plates in the axial direction. Each of the plurality of steel plates is formed so as to cover the rotor 11 from the outside in the radial direction while maintaining a predetermined radial gap 24 in the radial direction with the rotor 11. The spacing plate 22 has a hollow disk shape that covers the rotor 11 from the outside in the radial direction while maintaining the radial gap 24. The spacing plate 22 is formed with a plurality of radial grooves (not shown) formed so as to communicate with the radially inner side and the outer side. A gas medium such as air can flow through the radial gap 24 and the radial groove.

  The frame 30 is formed with one suction port 31 for taking in outside air and one discharge port 32 for discharging the air in the frame 30. The suction port 31 is opened substantially vertically above the vicinity of the axial end of the stator 20 on the side opposite to the load (left side in FIG. 1). The discharge port 32 is opened substantially vertically above the vicinity of the axial end of the stator 20 on the load side.

  An anti-load-side air flow path 33 is formed in the frame 30 so that air sucked from the suction port 31 can flow downward toward the rotary shaft 10 through the anti-load-side end of the stator 20. Yes. Further, two horizontal flow paths 35 are formed on both sides of the upper portion of the stator 20 with an ascending flow path 36 (described later) formed right above the stator 20 therebetween. Each of these horizontal flow paths 35 extends in the axial direction on the radially outer side (upward) of the stator 20 and is parallel to each other. Further, the anti-load side of each of the horizontal flow paths 35 is formed so as to communicate with the anti-load side air flow path 33. On the other hand, on the load side of the stator 20, a load-side air flow path 34 that is in communication with the load side of each of the two horizontal flow paths 35 is formed. That is, the anti-load side air flow path 33 and the load side air flow path 34 are communicated with each other by the horizontal flow path 35.

  The circulation fan 12 is disposed in the frame 30 directly above the stator 20 and between the suction port 31 and the discharge port 32. On the other hand, an ascending channel 36 extending from the upper part of the stator 20 toward the circulation fan 12 is formed between the two horizontal channels 35. The circulation fan 12 is a fan that is rotated by a circulation fan motor 13 and rotates about a rotation axis that extends substantially vertically. The circulation fan 12 is configured to suck in air flowing through the ascending flow path 36 and discharge it from the discharge port 32.

  A discharge air flow path 37 extending from the discharge port 32 toward the circulation fan 12 is formed in the frame 30. This discharge air flow path 37 is a flow path extending horizontally, and is a flow path for circulating the air in the frame 30 sucked by the circulation fan 12 toward the discharge port 32.

  The cooling mechanism includes two air circulation systems formed in the frame 30, that is, a first air circulation system 51 and a second air circulation system 52. In FIG. 1, the first air circulation system 51 is indicated by a solid line arrow, and the second air circulation system 52 is indicated by a broken line arrow.

  The first air circulation system 51 is a system that preferentially cools the bearing disposed on the anti-load side, and the second air circulation system 52 is a system that preferentially cools the bearing disposed on the load side. is there. Below, the flow of each air of the 1st air circulation system 51 and the 2nd air circulation system 52 is demonstrated.

  In the first air circulation system 51, first, a part of the air taken in from the suction port 31 descends toward the rotating shaft 10 in the anti-load side flow path. After this, the bearing on the side opposite to the load is circulated to cool the bearing on the side opposite to the load.

  The air flowing in the vicinity of the bearing on the opposite load side flows into a radial gap 24 formed between the rotor 11 and the stator 20. The inflowed air flows in the radial gap 24 along the axial direction from the non-load side to the load side, that is, from the left side to the right side in FIG. At this time, the radially outer surface of the rotor 11, the stator 20 and the like are cooled by this air.

  The air flowing in the radial gap 24 from the anti-load side to the load side passes through the radial groove formed in the spacing plate 22 and escapes to the ascending flow path 36 and rises toward the circulation fan 12. At this time, the stator 20 is cooled by the air flowing through the radial grooves. The air that flows through the ascending flow path 36 and is sucked into the circulation fan 12 flows through the discharge air flow path 37 and is discharged from the discharge port 32. The above is the air flow in the first air circulation system 51.

  In the second air circulation system 52, first, a part of the air taken in from the suction port 31 is branched while descending the anti-load side air flow path 33 toward the rotary shaft 10, so that two horizontal flows It flows into each path 35. The air flowing into each of the two horizontal flow paths 35 circulates in each horizontal flow path 35 from the anti-load side toward the load side, that is, from the left side to the right side in FIG. It flows into the flow path 34.

  The air flowing into the load-side air flow path 34 flows in the vicinity of the load-side bearing and cools the bearing. Air flowing in the vicinity of the bearing on the load side flows into the radial gap 24 in the direction from the load side to the anti-load side, that is, from the left side to the right side in FIG.

  The air flowing in the radial gap 24 from the load side to the anti-load side passes through the radial groove and the ascending flow path 36 and rises toward the circulation fan 12. At this time, it merges with the first air circulation system 51. Here, similarly to the first air circulation system 51, the rotor 11 and the stator 20 are cooled by this air. The air sucked into the circulation fan 12 flows through the discharge air flow path 37 and is discharged from the discharge port 32. The above is the air flow in the second air circulation system 52.

  Each horizontal channel 35 may cover the wall surface of the horizontal channel 35 with a heat insulating material or the like so that the air flowing through the horizontal channel 35 is not heat exchanged with the air in the ascending channel 36.

  Here, the anti-load side air flow path 33, the radial groove, and the ascending flow path 36 in the vicinity of the suction port 31 are flow paths common to each other in the first air flow system 51 and the second air flow system 52. .

  Further, in the anti-load side air flow path 33, the flow path cross section of the branch portion branched to the first air circulation system 51 and the second air circulation system 52 is formed to be substantially the same. Good. That is, the flow area of the connecting portion between each of the two horizontal flow paths 35 and the anti-load side air flow path 33 is approximately equal to the flow area of the anti-load side air flow path 33 that flows directly downward toward the rotary shaft 10. It is good to keep it the same. At this time, a flow straightening plate or the like may be disposed to reduce air flow resistance or the like. Thereby, the air flow rates of the first air circulation system 51 and the second air circulation system 52 can be made substantially the same, and the bearings on the load side and the anti-load side can be cooled in the same manner. become.

  The air flow in each of the first air circulation system 51 and the second air circulation system 52 is due to forced convection generated by the circulation fan 12. The circulation fan 12 of the present embodiment is a fan of a type that is arranged on the downstream side of each of the first air circulation system 51 and the second air circulation system 52 and sucks air in these systems 51 and 52. Is used.

  As can be seen from the above description, according to this embodiment, it is possible to suck outside air from one suction port 31, circulate through the frame 30, and discharge from the one discharge port 32. Since only one suction port 31 and one discharge port 32 are formed, the configuration of piping equipment for supplying cooling air to be arranged in the rotating electrical machine can be simplified. This makes it possible to install auxiliary equipment for a rotating electrical machine such as a rotating electrical machine and piping equipment in a smaller space.

[Second Embodiment]
A second embodiment of the rotating electrical machine according to the present invention will be described with reference to FIG. FIG. 2 is a schematic front view of a partially cutout of the rotating electrical machine of the present embodiment. In addition, this embodiment is a modification of 1st Embodiment, Comprising: The same code | symbol is attached | subjected to the same part or similar part as 1st Embodiment, and duplication description is abbreviate | omitted.

  The circulation fan 12 of the present embodiment has the circulation fan 12 disposed upstream of the suction port 31, that is, upstream of each of the first air circulation system 51 and the second air circulation system 52. Using a fan that feeds air. In this case, the ascending flow path 36 and the discharge air flow path 37 are directly connected. In the example of FIG. 2, the suction port 31 is opened horizontally. The circulation fan motor 13 is disposed outside the frame 30 in the vicinity of the suction port 31, and the rotation shaft of the circulation fan motor 13 is disposed horizontally.

  As a result, the same effects as those of the first embodiment can be obtained, and the structure in the frame 30 above the stator 20 can be further simplified.

[Third Embodiment]
A third embodiment of the rotating electrical machine according to the present invention will be described with reference to FIG. FIG. 3 is a schematic front view of a partially cutout of the rotating electrical machine of the present embodiment. In addition, this embodiment is a modification of 1st Embodiment, Comprising: The same code | symbol is attached | subjected to the same part or similar part as 1st Embodiment, and duplication description is abbreviate | omitted.

  In the circulation fan 12 of the present embodiment, the circulation fans 12 that rotate together with the rotation shaft 10 are disposed on both sides in the axial direction of the stator 20, that is, on the load side and the anti-load side. Further, the ascending flow path 36 and the discharge air flow path 37 are directly connected.

  As each of these two circulation fans 12 rotates, the air in the vicinity of the suction port 31 is sucked to circulate the first and second air circulation systems 51 and 52, respectively. The air sucked into each circulation fan 12 flows into the radial gap 24 from both sides in the axial direction. The air that has flowed into the radial gap 24 from each of the load side and the non-load side merges in the ascending flow path 36 through the radial groove and is discharged from the discharge port.

  Thereby, the effect similar to 1st Embodiment is acquired. Further, since the circulation fan motor 13 is not required, the structure in the frame 30 above the stator 20 can be further simplified.

[Other Embodiments]
The description of the above embodiment is an example for explaining the present invention, and does not limit the invention described in the claims. Moreover, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim.

  For example, in the first embodiment, the suction port 31 and the discharge port 32 are opened vertically, but the present invention is not limited to this. For example, you may form so that it may open horizontally. In this case, the circulation fan 12 may be disposed beside and the air in the frame 30 may be sucked.

  Further, the suction port 31 and the discharge port 32 may be formed on opposite sides in the axial direction.

DESCRIPTION OF SYMBOLS 10 ... Rotating shaft, 11 ... Rotor, 12 ... Circulating fan, 13 ... Circulating fan motor, 20 ... Stator, 21 ... Steel plate group, 22 ... Space plate, 24 ... Radial gap, 30 ... Frame, 31 ... Suction port, 32 ... discharge port, 33 ... anti-load side air flow path, 34 ... load side air flow path, 35 ... horizontal flow path, 36 ... ascending flow path, 37 ... discharge air flow path, 51 ... first air Distribution system, 52 ... second air distribution system

Claims (6)

A rotating shaft that is rotatably supported by at least two bearings and extends horizontally;
A rotor disposed between the two bearings and fixed to the rotary shaft to rotate around the rotary shaft;
A group of steel plates in which a plurality of hollow disk-shaped steel plates covering the rotor from the outside in the radial direction while maintaining a predetermined radial space in the radial direction with the rotor are laminated in the axial direction, and the radial gap And a space plate having a plurality of radial grooves in which the inner side and the outer side communicate with each other in a hollow disk shape that covers the rotor from the outer side in the radial direction while maintaining the above-described structure. A stator and
In the rotating electrical machine cooling mechanism for cooling the rotating electrical machine having a gas medium,
The rotating electrical machine cooling mechanism is
One suction port that opens outward in one axial direction of the stator and can take in the gas medium, and one discharge port that opens outward in the other axial direction of the stator and discharges the gas medium, respectively A frame formed and configured to accommodate at least the rotor and stator;
A circulating fan configured so that the gaseous medium taken in from the suction port circulates in the frame and is exhausted from the discharge port;
Have
In the frame,
Part of the gaseous medium taken in from the suction port flows toward the rotating shaft, flows in the vicinity of one of the bearings, then flows into the radial gap, and axially passes through the radial gap. A first gas medium circulation system that circulates in one direction along the radial gap, passes through the radial groove, and is discharged from the discharge port;
A part of the gaseous medium taken in from the suction port is branched in the middle of the rotation axis, and after flowing in the one direction along the axial direction on the radially outer side of the stator, And then flows in the radial gap after flowing in the vicinity of the other bearing, flows in the radial gap in the direction opposite to the one direction, and from the radial gap to the radial groove. A second gas medium circulation system that passes through the first gas medium circulation system and is discharged from the discharge port,
Formed ,
The second gas medium flow system includes two horizontal flow paths each flowing in parallel with each other along the axial direction on the radially outer side of the stator, and between the two horizontal flow paths, An ascending channel is formed in which the gaseous medium passing through the radial groove is directed to the circulation fan, and each of the two horizontal channels is provided with a heat insulating material for suppressing heat exchange with the ascending channel. Yes,
Rotating electrical machine cooling mechanism according to claim 1, characterized in that. The circulation fan is disposed directly above the stator in the frame, rotates around a vertical axis extending vertically, and the gas medium is used as the first gas medium distribution system or the second gas medium. 2. The rotating electrical machine cooling mechanism according to claim 1, wherein the rotating electrical machine cooling mechanism is configured to suck the gas medium flowing through the distribution system and discharge the gas medium from the discharge port . The frame is formed such that the suction port opens upward at a position adjacent to the circulation fan in the axial direction, and the discharge port is positioned on the opposite side of the suction port with the circulation fan interposed in the axial direction. The rotating electrical machine cooling mechanism according to claim 2, wherein the rotating electrical machine cooling mechanism is formed so as to open upward . The circulation fan is disposed in the frame in the vicinity of the suction port, rotates around a horizontal axis extending horizontally, sucks the gas medium, and the gas medium is sent to the first gas medium circulation system or the 2. The rotating electrical machine cooling mechanism according to claim 1 , wherein the rotating electrical machine cooling mechanism is configured to flow into a second gas medium circulation system and discharge from the discharge port . The circulation fan is arranged so as to rotate together with the rotation shaft on both sides in the axial direction of the stator,
Each circulation fan is configured to discharge the gas medium, which has sucked the gas medium from the suction port, from the both sides in the axial direction into the radial gap, and then discharge from the discharge port.
The rotating electrical machine cooling mechanism according to claim 1 .   A rotating shaft that is rotatably supported by at least two bearings and extends horizontally;
  A rotor disposed between the two bearings and fixed to the rotary shaft to rotate around the rotary shaft;
  A group of steel plates in which a plurality of hollow disk-shaped steel plates covering the rotor from the outside in the radial direction while maintaining a predetermined radial space in the radial direction with the rotor are laminated in the axial direction, and the radial gap And a space plate having a plurality of radial grooves in which the inner side and the outer side communicate with each other in a hollow disk shape that covers the rotor from the outer side in the radial direction while maintaining the above-described structure. A stator and
  A suction port that opens to the outside in one axial direction of the stator and can take in a gas medium and a discharge port that opens to the outside in the other axial direction of the stator and discharges the gas medium are formed one by one A frame formed to accommodate at least the rotor and the stator;
  A circulating fan configured so that the gaseous medium taken in from the suction port circulates in the frame and is exhausted from the discharge port;
  Have
  The frame is
  Part of the gaseous medium taken in from the suction port flows toward the rotating shaft, flows in the vicinity of one of the bearings, then flows into the radial gap, and axially passes through the radial gap. A first gas medium circulation system that circulates in one direction along the radial gap, passes through the radial groove, and is discharged from the discharge port;
  A part of the gaseous medium taken in from the suction port is branched in the middle of the rotation axis, and after flowing in the one direction along the axial direction on the radially outer side of the stator, And then flows in the radial gap after flowing in the vicinity of the other bearing, flows in the radial gap in the direction opposite to the one direction, and from the radial gap to the radial groove. A second gas medium circulation system that passes through the first gas medium circulation system and is discharged from the discharge port,
  Formed,
  The second gas medium flow system includes two horizontal flow paths each flowing in parallel with each other along the axial direction on the radially outer side of the stator, and between the two horizontal flow paths, An ascending channel is formed in which the gaseous medium passing through the radial groove is directed to the circulation fan, and each of the two horizontal channels is provided with a heat insulating material for suppressing heat exchange with the ascending channel. Yes,
  Rotating electric machine characterized by that.

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