JP2010206977A - Fully closed motor device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently cool a bearing on a load side. <P>SOLUTION: A fully closed motor device includes a rotor 12 rotating around the rotary shaft 10 supported with a bearing 16, a bearing housing 18 to which the bearing 16 is fixed, a blow part 20 disposed in the vicinity of the rotary shaft 10 end on the anti-load side of the rotor shaft 10 for blowing air to the load side, and the main frame 15 configured to extend in the direction of the rotary shaft 10 to cover the rotor 12 and to which the bearing housing is fixed. Heat transfer fin groups 31 to 34 are disposed on the outer circumferential surface of the main frame 15. Ventilation piping 41 to 44 are disposed between the heat transfer fin groups 31 to 34 adjacent with each other on the outer circumference of the main frame 15. The ventilation pipes 41 to 44 extend in the direction of the rotary shaft 10 to allow the air blown from the blow part 20 to circulate therein. The downstream air circulated in the ventilation piping 41 to 44 passes in the vicinity of the bearing housing on the load side. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a fully-closed electric motor device having a blower on the non-load side.

  A fully-closed electric motor device generally includes a rotor that rotates around a rotation axis, a stator that surrounds the rotor, a main frame that covers the stator from the outside, and heat generated from the rotor and the stator. It has heat transfer fins for discharging to the outside. One end of the rotating shaft is connected to a load, and a cooling fan that blows air for cooling the heat transfer fins is provided in the vicinity of the other end.

  The heat generated with the rotation of the rotor is generally transferred to the heat transfer fins via the main frame. Some of the heat is transferred to the bearing housing fitted to the main frame and further transferred to the heat transfer fins on the outer surface. When the temperature of the bearing rises due to the heat, the lubricating grease in the bearing may be deteriorated. For this reason, it is necessary to cool the bearing.

  However, since the bearing fixed by the bearing housing, especially the load-side bearing connected to the load is far from the cooling fan, it is often difficult to cool.

  As a method for cooling the bearings of the fully-closed electric motor device, for example, as disclosed in Patent Document 1, a part of the air blown by a cooling fan installed inside the electric motor circulates in the main frame. There are known a method in which a duct is formed in the main frame and the bearing on the load side is cooled by air flowing through the duct, and a method in which the rotor itself is cooled by passing circulating air through the rotor. .

JP-A-9-154254

  However, as in the above example, there are many fully-enclosed electric motor devices having a relatively large main frame that can circulate cooling air inside the main frame. If a space for providing a duct for circulating air through the rotor cannot be secured, it is difficult to use the above method.

  A fully-enclosed electric motor device of the type in which most of the air blown from the cooling fan circulates around the heat transfer fins arranged outside the main frame has the cooling air circulated around the heat transfer fins on the load side Some of them are sprayed on the bearings. In this structure, cooling air exchanges heat when flowing around the cooling fins. For this reason, air in a state where the temperature is higher than the air immediately after being blown from the cooling fan is blown to the bearing housing on the load side. In this case, the bearing in the bearing housing may not be efficiently cooled.

  The present invention has been made to solve the above-described problems, and an object thereof is to efficiently cool the load-side bearing of the fully-closed electric motor apparatus.

  In order to achieve the above object, a fully-closed motor device according to the present invention is a fully-closed motor device coupled to a load at a load side end at one end in the axial direction, and is at least two arranged at intervals. A rotor that rotates around a rotating shaft that is rotatably supported by two bearings, a bearing fixing portion that fixes the bearing, and a rotating shaft end portion on the opposite side of the rotating shaft from the load side. An air blower capable of blowing air toward the load side of the rotating shaft, and a main frame that extends in the direction of the rotating shaft and covers the rotor from the outside in the radial direction, to which the bearing fixing portion is fixed. Each including a plurality of heat transfer fins arranged adjacent to each other at an interval, and each of the plurality of heat transfer fin groups arranged on the outer peripheral surface of the main frame at intervals in the circumferential direction; Adjacent the outer periphery of the main frame Arranged between the groups, extending in the direction of the rotation axis, the air blown from the blower part can flow through the inside, and the air flows in the vicinity of the bearing fixing part on the load side downstream thereof And a ventilation pipe configured as described above.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to cool efficiently the bearing by the side of the load of a fully-closed electric motor apparatus.

1 is a schematic perspective view of an embodiment of a fully closed electric motor device according to the present invention. FIG. 2 is a schematic partial longitudinal sectional view of FIG. 1. FIG. 3 is a cross-sectional view taken along the line III-III of the main frame in FIG. 2.

  Hereinafter, an embodiment of a fully-closed electric motor apparatus according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic perspective view of a fully-closed electric motor apparatus according to this embodiment. FIG. 2 is a schematic partial longitudinal sectional view of FIG. FIG. 3 is a cross-sectional view of the main frame of FIG.

  First, the structure of the fully-closed electric motor apparatus of this embodiment is demonstrated.

  As shown in FIGS. 1 and 2, the fully-closed electric motor apparatus according to the present embodiment includes a rotor 12 that rotates around the rotation shaft 10 and a stator 11 that is disposed so as to cover the rotor 12 from the outside in the radial direction. And a main frame 15 that covers the stator 11 from the outside in the radial direction and covers both sides in the direction of the rotation axis 10.

  The rotating shaft 10 is rotatably supported by at least two bearings, that is, the first bearing 16 and the second bearing, respectively. The second bearing is disposed on the opposite side of the load from the load, and the first bearing 16 is disposed on the load side connected to the load. Here, illustration of the second bearing is omitted.

  Each of the first bearing 16 and the second bearing is fixed so as to be covered from the outside in the radial direction by a bearing fixing portion (bearing housing 18). The bearing housing 18 is fitted to the main frame 15.

  A blower unit 20 is provided on the opposite side of the rotating shaft 10. The blower 20 is a cooling fan 22 that can rotate around the rotary shaft 10 and blows cooling air from the non-load side toward the load side. The air flow through the cooling fan is indicated by arrows 70.

  On the outer peripheral surface of the main frame 15, four heat transfer fin groups along the circumferential direction, that is, the first heat transfer fin group 31, the second heat transfer fin group 32, the third heat transfer fin group 33, and the fourth A heat transfer fin group 34 is formed in this order. Each of these heat transfer fin groups 31 to 34 has a plurality of heat transfer fins 35. The plurality of heat transfer fins 35 constituting one heat transfer fin group, for example, the first heat transfer fin group 31, is a substantially flat plate whose longitudinal direction extends in the direction of the rotary shaft 10, and is parallel to each other with a space therebetween. Has been placed.

  The first heat transfer fin group 31 and the third heat transfer fin group 33 are arranged so as to face each other with the rotating shaft 10 interposed therebetween, and constitute the first and third heat transfer fin groups 31 and 33, respectively. The short direction of the heat transfer fin 35 is arranged so as to extend substantially vertically.

  The second heat transfer fin group 32 and the fourth heat transfer fin group 34 are arranged so as to face each other with the rotating shaft 10 interposed therebetween, and constitute the second and fourth heat transfer fin groups 32 and 34. The short direction of each heat transfer fin 35 is arranged to be substantially horizontal. That is, the heat transfer fins 35 constituting the first heat transfer fin group 31 and the plurality of heat transfer fins 35 constituting the second heat transfer fin group 32 are formed such that the angle formed in the circumferential direction is vertical. ing.

  Usually, the main frame 15 and the heat transfer fins 35 are integrally formed by casting. For example, a plurality of molds (not shown) are arranged along the circumferential direction of the main frame 15, and the main frame 15 and the heat transfer fins 35 are integrally formed so that these molds are pulled out radially outward. ing. At this time, one heat transfer fin group is formed by one mold arranged in the circumferential direction. For this reason, as described above, the heat transfer fins 35 constituting one heat transfer fin group are formed in parallel to each other in order to easily remove the mold.

  Further, heat transfer fin groups adjacent to each other in the circumferential direction, for example, between the first heat transfer fin group 31 and the second heat transfer fin group 32, that is, adjacent portions of molds with different pulling directions are heat transfer fins. 35 becomes a part where formation is difficult. That is, the vicinity of the adjacent portion between these molds becomes a dead space where the heat transfer fins 35 are not formed. In the present embodiment, the ventilation pipes 41 to 44 are arranged in a portion that becomes a dead space where the heat transfer fins 35 are difficult to form.

  As shown in FIG. 3, a first ventilation pipe 41 is arranged between the first and second heat transfer fin groups 31, 32, and between the second and third heat transfer fin groups 32, 33, A second ventilation pipe 42 is arranged. Similarly, a third ventilation pipe 43 is disposed between the third and fourth heat transfer fin groups 33 and 34, and a fourth ventilation pipe is provided between the fourth and first heat transfer fin groups 34 and 31. 44 is arranged.

  Legs 50 for installing a fully-closed electric motor device are provided outside the second and third ventilation pipes 42 and 43 in the radial direction.

  Each of the first to fourth ventilation pipes 41 to 44 arranged on the outer peripheral surface of the main frame 15 and between adjacent heat transfer fin groups is a pipe extending in the direction of the rotary shaft 10 and includes cooling air therein. A part of it circulates. A part of the cooling air is blown from the cooling fan 22 and circulates in the first to fourth ventilation pipes 41 to 44 from the anti-load side on the upstream side to the load side on the downstream side. .

  Each of the first to fourth ventilation pipes 41 to 44 is configured such that a part of the cooling air flowing on the downstream side is blown to the bearing housing 18 that fixes the first bearing 16. Further, the cooling air blown to the bearing housing 18 covering the first bearing 16 is configured to be exhausted to the outside of the main frame 15.

  In FIG. 1, detailed illustration of the first bearing 16 and the bearing housing 18 is omitted, but a part of the cooling air is configured to flow in the direction toward the rotating shaft 10.

  Each of the first to fourth ventilation pipes 41 to 44 is integrally formed with the heat transfer fin 35 and the main frame 15. For example, it is possible to form the outside of the first ventilation pipe using a mold for forming the first and second heat transfer fin groups 31 and 32.

  Then, the effect | action of this embodiment is demonstrated.

  When the rotor 12 is rotating around the rotary shaft 10, heat is generated along with this rotation. This heat is exchanged with the outside through a plurality of heat transfer fins 35 disposed on the outer peripheral surface of the main frame 15. At this time, as the cooling fan 22 rotates, cooling air is blown from the anti-load side toward the load side. A part of the cooling air flows around the heat transfer fins 35 along the longitudinal direction of the plurality of heat transfer fins 35, and exchanges heat with the outside through the heat transfer fins 35.

  A part of the cooling air sent from the cooling fan 22 circulates through the first to fourth ventilation pipes 41 to 44. The cooling air flowing through the downstream sides of the first to fourth ventilation pipes 41 to 44 is blown to the bearing housing 18 that fixes the first bearing 16 on the load side. The air blown to the bearing housing 18 is exhausted to the outside of the main frame 15. The air flowing through each of the first to fourth ventilation pipes 41 to 44 does not circulate around the plurality of heat transfer fins 35 whose temperatures are rising. That is, the air flows toward the downstream side (load side) with almost no contact with the surface of the heat transfer fin 35. For this reason, it can suppress that the temperature of the air which distribute | circulates a downstream rises with respect to the air which distribute | circulates the upstream of each of the 1st-4th ventilation piping 41-44.

  As can be seen from the above description, according to the present embodiment, the cooling air blown from the anti-load side by the cooling fan 22 is blown to the load-side bearing housing 18 in a state in which the temperature rise is suppressed. The first bearing 16 on the load side can be efficiently cooled.

  For this reason, it is possible to suppress deterioration of the grease for lubricating the bearing, and it is possible to suppress the wear rate of the bearing.

  Moreover, since each of the first to fourth ventilation pipes 41 to 44 is arranged in a so-called dead space between adjacent heat transfer fin groups along the circumferential direction, the conventional fully closed electric motor device Therefore, it is possible to increase the cooling efficiency without significant modification.

  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, the bearing covering the first bearing 16 can circulate the inside of the main frame so that the cooling air blown to the housing flows toward the cooling fan 22.

  Moreover, although the 1st-4th ventilation piping 41-44 is integrally formed with the heat-transfer fin and the main frame, it is not restricted to this. For example, the ventilation pipe may be attached later to the main frame on which the heat transfer fin group is formed.

DESCRIPTION OF SYMBOLS 10 ... Rotary shaft, 11 ... Stator, 12 ... Rotor, 15 ... Main frame, 16 ... 1st bearing, 18 ... Bearing housing, 20 ... Air blower, 22 ... Cooling fan, 31 ... 1st heat-transfer fin group, 32 ... 2nd heat transfer fin group, 33 ... 3rd heat transfer fin group, 34 ... 4th heat transfer fin group, 35 ... Heat transfer fin, 41 ... 1st ventilation piping 41, 42 ... 2nd ventilation piping 42, 43 ... 3rd ventilation piping 43, 44 ... 4th ventilation piping 44, 50 ... Leg part

Claims (4)

A fully-closed electric motor device coupled to a load at a load side end at one end in the axial direction,
A rotor that rotates about a rotating shaft rotatably supported by at least two bearings spaced from each other;
A bearing fixing portion for fixing the bearing;
An air blower that is disposed in the vicinity of the end of the rotary shaft on the opposite side of the load side of the rotary shaft and capable of blowing air toward the load side of the rotary shaft;
A main frame that extends in the direction of the rotation axis and covers the rotor from the outside in the radial direction, to which the bearing fixing portion is fixed;
A plurality of heat transfer fins each disposed adjacent to each other with a space between each other, and a plurality of heat transfer fin groups each disposed on the outer peripheral surface of the main frame with a space therebetween in the circumferential direction;
Arranged between the heat transfer fin groups adjacent to each other on the outer periphery of the main frame, extending in the direction of the rotation axis, and allowing the air blown from the blowing section to flow through the inside, and the air on the downstream side thereof A ventilation pipe configured to circulate in the vicinity of the bearing fixing portion on the load side;
A fully-closed electric motor device comprising:   The vent pipe is configured such that at least a part of the air flowing inside is exhausted outside the main frame after flowing in the vicinity of the bearing fixing portion on the load side. The fully-closed electric motor device according to claim 1.   The fully-enclosed electric motor device according to claim 1, wherein the blower unit includes a fan formed to rotate with the rotation shaft. The plurality of heat transfer fins constituting one heat transfer fin group are substantially flat plates whose longitudinal direction extends in the direction of the rotation axis, and each of them is arranged in parallel with an interval between each other,
4. The fully-closed electric motor device according to claim 1, wherein the ventilation pipe and the heat transfer fin group are cast products formed integrally with the main frame. 5.

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