JP2017195723A - Rotor withdrawal method and rotor withdrawal exclusive tool set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To withdraw a rotor from the inside of a stator reliably, without requiring subtle adjustment, when inspecting a dynamo-electric machine.SOLUTION: In the withdrawal method of the rotor of a dynamo-electric machine, a temporary bracket for maintaining the shaft core is attached after a second bearing bracket is removed, and a second bearing side extension member is connected with the rotor shaft (S02), some of multiple bolts for attachment to a first bearing bracket are removed and a guide rod is screwed into the bolt hole (S03), before removing the remaining bolts (S04), and then the rotor, first bearing bracket and second bearing bracket are withdrawn, as an integral structure, to the first bearing side along multiple guide rods and second bearing side extension member (S05).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of pulling out a rotor of a rotating electrical machine and a jig set for exclusive use of the rotor for pulling out the rotor.

  The rotating electrical machine includes a rotor and a stator. The rotor usually has a rotor shaft that rotates about its axis and a rotor core that is provided on the outer side in the radial direction of the rotor shaft. In the case of a permanent magnet type synchronous rotating electric machine, the rotor is provided with a permanent magnet.

  In the case of a synchronous machine or a wound-type induction machine, a rotor coil is provided near the radial surface of the rotor core. The stator has a cylindrical stator core in which ferromagnetic steel plates are laminated in the axial direction, and a stator coil wound around a tooth portion formed on the stator core.

  In a rotating electrical machine, an electric potential difference is generated between these coils and surrounding structures, and therefore there is an insulating portion for ensuring an insulating function. For this reason, it is important to maintain the soundness of the insulating portion. Moreover, in order to maintain the relative position between the components of the rotating electrical machine, there is a fixed portion such as a wedge. Since these insulating parts and fixed parts deteriorate over time, internal inspections must be carried out regularly.

JP 2012-161212 A Japanese Patent Laid-Open No. 9-237772 No. 6-9568

  In the overhaul of the rotating electrical machine, in order to check the rotor and the stator, it is necessary to pull the rotor out of the stator. For this purpose, for example, a method is known in which the rotor is pulled out from the bottom of the rotor with a floor plate extending to the outside of the stator and then suspended from above (see Patent Document 1).

  In addition, a method is known in which the rotor is pulled out in the axial direction by a wire and the weight is supported from above while cooperating with this (see Patent Document 2). Alternatively, a method is known in which both sides of the rotor shaft are extended by support pipes and the rotor is pulled out while both sides are suspended from above (see Patent Document 3).

  In these methods, when the rotor is pulled out in the axial direction with the rotor suspended from above, it is necessary to carry out with fine adjustment in order to maintain the horizontal state of the rotor.

  In particular, in the case of a permanent magnet type synchronous rotating electrical machine, it is difficult to pull out the rotor against the magnetic force when the rotor comes into close contact with the stator during the drawing process. Then, a delicate pulling operation while securing a gap between the rotor and the stator at the time of pulling out is essential.

  Accordingly, an object of the present invention is to reliably pull out the rotor from the stator without requiring fine adjustment when inspecting the rotating electrical machine.

  In order to achieve the above-described object, the present invention provides a rotor shaft that extends in the direction of the rotation axis and is rotatably supported by the first bearing and the second bearing, and a rotor core that is provided radially outside the rotor shaft. A cylindrical stator disposed on the outer side in the radial direction of the rotor, a frame provided on the outer side of the stator for fixing and supporting the stator, and an axial direction of the frame A first bearing bracket attached to a first end and supporting the first bearing; a second bearing bracket attached to a second end in the axial direction of the frame and supporting the second bearing; A method of pulling out the rotor of a rotating electrical machine having a shaft-maintenance temporary bracket after removing the second bearing bracket, and extending the second bearing side to the second bearing side of the rotor shaft A second bearing side measure step for connecting the material, a part of a plurality of bolts for attaching the first bearing bracket to the frame is removed from a bolt hole formed in the frame, and a guide rod is inserted into the bolt hole A guide rod connecting step for screwing together, a bolt removing step for removing the remaining bolts fixing the first bearing bracket after the second bearing side measure step, and the guide rod connecting step, and the bolt After the removal step, the rotor, the first bearing bracket, the second bearing side extension member, the first bearing and the second bearing are integrated into the plurality of guide rods and the shaft core maintaining member. Pulling the integrated structure to the first bearing side along the plurality of guide rods while supporting with a temporary bracket A guide state withdrawal step, and having a.

  According to another aspect of the present invention, there is provided a rotor having a rotor shaft that extends in the direction of the rotation axis and is rotatably supported by the first bearing and the second bearing, and a rotor core provided radially outside the rotor shaft. A cylindrical stator disposed on the radially outer side of the rotor, a frame provided on the outer side of the stator for fixing and supporting the stator, and a first end portion in the axial direction of the frame. Rotation of a rotating electrical machine having a first bearing bracket attached and supporting the first bearing, and a second bearing bracket attached to a second axial end of the frame and supporting the second bearing A tool set for exclusive use of a rotor drawer for pulling out a child, wherein the first bearing block formed in the frame passes through a through hole formed in the first bearing bracket attached to the frame. A plurality of guide rods formed so as to be able to be screwed into respective bolt holes for attaching the ket, a second bearing side extension member connected to an end of the rotor shaft on the second bearing side, and the second It is provided with the temporary bracket for axial center maintenance which replaces with a bearing bracket and maintains an axial center.

  According to the present invention, the rotor can be reliably pulled out of the stator without requiring fine adjustment when inspecting the rotating electrical machine.

It is a flowchart which shows the procedure of the rotor drawer | drawing-out method which concerns on embodiment. It is an elevation sectional view showing the state after the rotor drawer preparation in the rotor drawer method according to the embodiment. It is an elevation sectional view showing the state just after the 2nd bearing side measure step in the rotor extraction method concerning an embodiment. It is an elevation sectional view showing the state just after the guide rod connection step in the rotor pull-out method according to the embodiment. It is an elevation sectional view showing the state at the time of a guide state extraction step in the rotor extraction method according to the embodiment. It is an elevation sectional view showing a through hole of the 1st bearing bracket. It is an elevation sectional view showing a modification of a through hole of the 1st bearing bracket. It is an elevation sectional view showing the state at the time of the suspension state extraction step in the rotor extraction method according to the embodiment.

  Hereinafter, a rotor drawing method and a rotor drawing-only tool set according to an embodiment of the present invention will be described with reference to the drawings. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted.

  FIG. 1 is a flowchart illustrating a procedure of a rotor drawing method according to the embodiment. Hereinafter, the procedure will be described with reference to the drawing for each step shown in FIG.

  FIG. 2 is an elevational cross-sectional view illustrating a state after the rotor pull-out preparation in the rotor pull-out method according to the embodiment. That is, the state immediately after step S01 in FIG.

  As shown in FIG. 2, the rotating electrical machine 100 includes a rotor 10, a stator 20, and a frame 30. The rotor 10 includes a rotor shaft 11 that extends horizontally and is rotatably supported on both sides in the axial direction by a first bearing 31 and a second bearing 33, respectively, and a rotor core that is provided on the radially outer side of the rotor shaft 11. Twelve. The stator 20 includes a cylindrical stator core 21 disposed on the radially outer side of the rotor core 12 with the gap 25 sandwiched between the rotor core 12 and a stator that penetrates the radially inner portion of the stator core 21. It has a coil 22.

  The frame 30 is provided on the radially outer side of the rotor core 12 and the stator 20. A first bearing bracket 32 and a second bearing bracket 34 are attached to both ends in the axial direction of the frame 30 with a plurality of bolts (not shown). The first bearing bracket 32 fixedly supports the first bearing 31. Further, the second bearing bracket 34 fixedly supports the second bearing 33.

  First, as preparation for drawing out the rotor, removal of connection with external wiring, disconnection, removal of attached devices such as a tachometer, thermometer, and the like are performed (step S01). Further, a plurality of bolts for attaching the first bearing bracket 32 to the frame 30 are removed. Here, the positions of the bolts to be removed are selected so as to be distributed as evenly as possible in the circumferential direction. After removing the bolt, the bolt hole 30a of the frame 30 is opened.

  If necessary, the rotor 10, the stator 20, and the frame 30 are integrally mounted on an inspection rack (not shown).

  FIG. 3 is an elevational sectional view showing a state immediately after the second bearing side measure step in the rotor pulling method according to the embodiment. That is, the state immediately after step S02 in FIG.

  In this step S02, the second bearing bracket 34 is removed, and a shaft-maintenance temporary bracket 240 is attached instead. The second bearing side extension member 230 is connected to the end of the rotor shaft 11 on the second bearing 33 side.

  The axial center maintaining temporary bracket 240 can support the radially outer side of the second bearing 33 and has a through hole formed in the center. The second bearing side extension member 230 has an outer diameter corresponding to the through hole formed in the temporary shaft maintaining temporary bracket 240. The second bearing side extension member 230 is rod-shaped or tubular. As a result, the shaft center maintaining temporary bracket 240 is formed such that the second bearing side extension member 230 can move in the shaft center maintaining temporary bracket 240 in the axial direction. At that time, the axis of the rotor 10 is maintained in a horizontal state.

  FIG. 4 is an elevational sectional view showing a state immediately after the guide rod connecting step in the rotor pulling method according to the embodiment. That is, the state immediately after step S03 in FIG.

  In step S03, in step S01, a plurality of bolts that are part of the bolts for attaching the first bearing bracket 32 to the frame 30 are removed. The guide rods 210 are screwed together.

  The guide rod 210 has a circular rod shape with a cross section extending to one side, and a male screw (not shown) is formed in the vicinity of the tip. The side surface on which the male screw is not formed may be subjected to surface treatment for improving wear resistance and corrosion resistance, such as hard chrome plating.

  Since the guide rod 210 is a cantilever beam supported only by the frame 30, the female thread portion of the bolt hole 30a is formed to have a sufficient depth.

  Next, all the remaining bolts that have not been removed in step S03 are removed from the mounting bolts of the first bearing bracket 31 attached to the frame 30 (step S04).

  The case where steps S02, S03, and S04 are performed in this order has been described above. The removal of the bolt in step S04 must be performed after the guide rod is screwed in step S03. However, the order does not matter as long as this condition is satisfied. Moreover, you may carry out in parallel.

  FIG. 5 is a vertical sectional view illustrating a state at the time of the guide state extraction step in the rotor extraction method according to the embodiment. That is, the state of step S05 in FIG. 1 is shown.

  The rotor shaft 11, the rotor core 12, the second bearing 33, the first bearing 31, the first bearing bracket 32, and the second bearing side extension member 230 are integrally formed on the outer side in the axial direction on the first bearing 31 side. It is pulled out (step S05). Here, the group of objects drawn out integrally is referred to as an integrated structure 150.

  The integral structure 150 has both ends extending from the rotor shaft 11 to the second bearing side extension member 230 in the axial direction. The monolithic structure 150 is supported by a plurality of guide rods 210 and a shaft center temporary bracket 240.

  FIG. 6 is an elevational sectional view showing a through hole of the first bearing bracket. The guide rod 210 is inserted into the through hole 32 a of the first bearing bracket 32. In the vicinity of the inlet and the vicinity of the outlet 32b of the through hole 32a, the diameter smoothly increases as it approaches the surface. As a result, when the integrated structure 150 moves in the axial direction, the first bearing bracket 32 slides smoothly while a load is applied to the guide rod 210.

  FIG. 7 is an elevational sectional view showing a modification of the through hole of the first bearing bracket. The through-hole 32a does not have a portion with a constant diameter in the axial direction, and the cross-sectional shape cut by a plane including the central axis smoothly changes convexly toward the central axis. As a result, the inner surface of the through hole 32a and the guide rod 210 are not in surface contact but in line contact.

  As a result, even when the guide rod 210 is slightly bent, only the portion in line contact moves, and an unreasonable load is not applied partially. Therefore, when the integral structure 150 moves in the axial direction, the first bearing bracket 32 slides smoothly while a load is applied to the guide rod 210.

  FIG. 8 is a vertical cross-sectional view illustrating a state at the time of a suspension state extraction step in the rotor extraction method according to the embodiment. That is, the state of step S06 in FIG. 1 is shown.

  The hanging jig 250 is bent in an L shape, and is suspended from the lifting machine 260 by the lifting machine wire 80 at the A part which is one end thereof. The other end is coupled to the rotor shaft 11 which is a part of the unitary structure 150. In this state, the integral structure 150 is pulled out in the horizontal direction while being suspended by the lifting machine 260 (step S06).

  Here, the shape and dimensions of the suspension jig 250 are set so that the center of gravity of the entire structure is directly below the portion A in a state where the integrated structure 150 and the suspension jig 250 are coupled.

  Next, as shown in FIG. 1, the rotor 10 and the stator 20 are inspected (step S07).

  The rotor pull-out dedicated tool set 200 is used in the above procedure, and specifically includes a plurality of guide rods 210, a second bearing side extension member 230, and a shaft center maintaining temporary bracket 240. It is a set of. Moreover, you may include the hanging jig | tool 250 used as needed.

  The procedure for extracting the rotor has been described above. When the rotor core 12 is in the stator core 21, the axial cores of both of them are deviated more than an allowable value so that the outer surface in the radial direction of the rotor core 12 does not contact the inner surface in the radial direction of the stator core 21. In such a state, it is necessary to move the rotor 10 in the axial direction.

  In the present embodiment, one first bearing bracket 32 that supports the first bearing 31 is a portion that is extended in the axial direction as it is from a portion that is connected to the frame 30 in an assembled state by a plurality of guide rods 210. Supported by

  In addition, the other second bearing 33 side has a shaft-maintenance temporary bracket 240 installed in place of the second bearing bracket 34, and maintains the same shaft core, and the second bearing-side extension inserted therein. The integral structure 150 maintains the axial center by the member 230.

  As described above, when the rotor iron core 12 is in the stator iron core 21, the shaft core of the monolithic structure 150 and the stator 20 of the stator 20 are both in two places supporting the monolithic structure 150 including the rotor 10. The shaft core matches. Therefore, when the integral structure 150 is pulled out in the axial direction, there is no fear of deviation in the radial direction, and the rotor 10 can be reliably pulled out from the stator 20 without requiring fine adjustment. .

[Other Embodiments]
As mentioned above, although embodiment of this invention was described, embodiment is shown as an example and is not intending limiting the range of invention.

  For example, in the embodiment, the procedure for pulling out the rotor from the stator and the tool set for that purpose are shown. However, the scope of the present invention is not limited to drawing. That is, in the recovery after the rotor is pulled out and inspected, the rotor can be inserted into the stator by performing a procedure reverse to the procedure shown in the embodiment. At this time, it has the same effect as that at the time of pulling out in that it does not require delicate adjustment as in the prior art.

  In the embodiment, the horizontal rotating electric machine in which the rotor shaft extends horizontally is illustrated as an example in which the rotor is pulled out in the horizontal direction, but the present invention is not limited to this. For example, the present invention can also be applied to a case where a horizontally installed rotary electric machine is erected so that the rotor shaft is in the vertical direction and the rotor is pulled out vertically upward. In this case, the suspension jig used in the suspension state extraction step in step S06 may be a normal suspension jig from an upper part different from the L-shaped jig such as the suspension jig 250.

  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 scope of the invention and the scope of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 10 ... Rotor, 11 ... Rotor shaft, 12 ... Rotor iron core, 20 ... Stator, 21 ... Stator iron core, 22 ... Stator coil, 25 ... Gap, 30 ... Frame, 30a ... Bolt hole, 31 ... First Bearing, 32 ... first bearing bracket, 32a ... through hole, 32b ... near inlet and near outlet, 33 ... second bearing, 34 ... second bearing bracket, 80 ... lifter wire, 100 ... rotary electric machine, 150 ... integral structure 200 ... Jig set for exclusive use of rotor drawer, 210 ... Guide rod, 230 ... Second bearing side extension member, 240 ... Temporary bracket for maintaining the shaft center, 250 ... Suspension jig, 260 ... Lifting machine

Claims (5)

A rotor having a rotor shaft extending in the direction of the rotation axis and rotatably supported by the first bearing and the second bearing; and a rotor core provided on the radially outer side of the rotor shaft;
A cylindrical stator disposed on the radially outer side of the rotor;
A frame provided outside the stator and fixedly supporting the stator;
A first bearing bracket attached to the first axial end of the frame and supporting the first bearing;
A second bearing bracket attached to the second axial end of the frame and supporting the second bearing;
A method for pulling out the rotor of a rotating electrical machine having
A second bearing side measure step for attaching a temporary bearing maintaining bracket after removing the second bearing bracket, and connecting a second bearing side extension member to the second bearing side of the rotor shaft;
A guide rod connecting step of removing a part of a plurality of bolts for mounting the first bearing bracket to the frame from a bolt hole formed in the frame, and screwing a guide rod into the bolt hole;
After the second bearing side measure step and the guide rod connecting step, a bolt removing step for removing the remaining bolt that has fixed the first bearing bracket;
After the bolt removing step, the rotor, the first bearing bracket, the second bearing side extension member, the first bearing and the second bearing are integrated into the plurality of guide rods and the shaft core. A guide state extraction step of extracting the integrated structure toward the first bearing along the plurality of guide rods while being supported by the temporary bracket for maintenance;
A rotor drawing method comprising:   The rotor drawing method according to claim 1, further comprising a hanging state drawing step after the guiding state drawing step, further pulling the integrated structure while hanging from above. A rotor having a rotor shaft extending in the direction of the rotation axis and rotatably supported by the first bearing and the second bearing; and a rotor core provided on the radially outer side of the rotor shaft;
A cylindrical stator disposed on the radially outer side of the rotor;
A frame provided outside the stator and fixedly supporting the stator;
A first bearing bracket attached to the first axial end of the frame and supporting the first bearing;
A second bearing bracket attached to the second axial end of the frame and supporting the second bearing;
A set of jigs exclusively for pulling out a rotor for pulling out a rotor of a rotating electric machine having
A plurality of guides formed so as to be able to be screwed into respective bolt holes for mounting the first bearing bracket formed in the frame through a through hole formed in the first bearing bracket attached to the frame. The rod,
A second bearing side extension member connected to an end of the rotor shaft on the second bearing side;
A temporary bracket for maintaining the shaft core for maintaining the shaft core instead of the second bearing bracket;
A jig set for exclusive use of the rotor drawer characterized by comprising.   The inner surface of the through hole formed in the first bearing bracket does not have a portion with a constant diameter in the axial direction, and a cross-sectional shape cut by a plane including the central axis is convex toward the central axis. The jig set for exclusive use of the rotor drawer according to claim 3, wherein the jig is configured to change smoothly.   Each of the plurality of guide rods has a circular cross section extending to one side, a male screw is formed in the vicinity of the tip, and a side surface on which no male screw is formed is a surface to be coated to improve wear resistance and corrosion resistance. The jig set for exclusive use of a rotor drawer according to claim 3 or 4, further comprising a processing layer.

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