JP6603267B2 - End cover coupling method - Google Patents

Description

The present invention relates et Ndokaba binding method.

  The rotating electrical machine has a rotor and a stator. The rotor includes a rotor shaft extending in the axial direction and a rotor core provided on the outer side in the radial direction of the rotor shaft. The stator includes a stator core provided with a gap on the outer side in the radial direction of the rotor core, and a plurality of stator windings penetrating the stator core.

  The rotor core and the stator are housed in the frame. In many rotating electrical machines, bearings that rotatably support the rotor shaft are provided on both sides of the rotor core in the direction of the rotation axis.

  In many rotating electrical machines, bearing brackets are provided at both ends of the frame in the rotation axis direction, and each of the bearing brackets supports and supports each bearing.

  In the case of a large rotating electrical machine, the bearing portion of the rotating electrical machine may be supported by two independent bearing bases. In this case, end covers that do not have a bearing support function are provided at both ends of the frame in place of the bearing bracket.

  Since the bearing stand is provided outside the end cover, the rotor shaft passes through the end cover. In a portion where the rotor shaft passes through the end cover, a gap between the end cover and the rotor shaft is secured. Further, a fan guide of a fan that drives a cooling gas inside the rotating electrical machine is supported by the end cover. A predetermined gap is secured between the fan and the fan guide.

  If the gap between the end cover and the rotor shaft and the gap between the fan and the fan guide are too large, for example, the air blowing function of the fan is lowered, and the flow rate of the cooling air is lowered. If the gap is too small, there is a risk of contact between the end cover and the rotor shaft, or contact between the fan and the fan guide. Therefore, the size of these gaps needs to be within a predetermined width.

  The mounting position of the end cover to the frame deviates from the normal position, which may hinder the required clearance, and the rotating electrical machine will not be contacted by contact between the end cover and the rotor shaft or between the fan and the fan guide. There is a possibility of damage. For this reason, for example, when the end cover is reattached to the frame after the end cover is removed for inspection or the like, the attachment position of the end cover to the frame needs to be accurately reproduced.

  In order to reproduce the mounting position, there are usually an inlay method and a reamer bolt method. For large items such as end covers attached to the frame, it is difficult to process the inlay, and a method using a reamer bolt is used.

  FIG. 9 is a longitudinal sectional view showing a conventional end cover coupling structure. The frame 40 is formed with a reamer hole 40 a that fits tightly with the reamer bolt 61. Further, a reamer hole 50a that fits tightly with the reamer bolt 61 is also formed on the end cover 50 side. In this way, when the end cover 50 is inspected, the end cover 50 can be reattached to the frame 40 at an accurate position via the reamer bolt 61 even if the end cover 50 is once removed. Here, the reamer hole refers to an insertion hole in which dimensional management of the inner diameter is performed in order to fit with the reamer bolt.

  Thus, in the method using the reamer bolt, it is necessary to accurately align the reamer hole formed in the frame and the reamer hole formed in the end cover. At the time of manufacturing the rotating electric machine, the end cover and the frame can be easily reproduced using the holes formed in the common place.

JP 2002-372016 A

  Generally, a reamer bolt is fitted into a reamer hole having an inner diameter slightly smaller than the outer diameter thereof. Therefore, it is difficult to fit even if the core is slightly displaced. Therefore, in order to enable the end cover 50 to be attached to the frame 40 at an accurate position via the reamer bolt 61, for example, the end cover 50 and the frame 40 are overlapped, and the reamer hole 40a of the frame 40 and the end cover 50 are overlapped. It is necessary to process by the method of forming the reamer hole 50a simultaneously.

  When attaching the end cover to the frame, when forming the reamer hole 50a and the reamer hole 40a for the reamer bolt at the same time in the end cover and the frame as in the production of the rotating electric machine, a taper portion is provided on the reamer bolt. There is also known a technique for forming such that there is no play (see Patent Document 1).

  On the other hand, if it is necessary to replace the end cover in the state after the rotating electrical machine is installed on site, as in the periodic inspection after operation, the end cover must be It is necessary to consider that the allowable range of misalignment between the reamer hole formed in the frame and the reamer hole formed in the frame is narrow. For this reason, for example, it is necessary to bring the frame back to the factory and perform drilling simultaneously with the new end cover. However, this is a heavy burden both in terms of process and cost.

  For this reason, there has been a demand for an end cover mounting structure in which the end cover is drilled independently and without play.

This invention is made | formed in view of this subject, and it aims at obtaining the end cover coupling | bonding method which can perform the drilling process of the end cover of a rotary electric machine independently.

In addition, the present invention provides a rotor having a rotor shaft and a rotor iron core and rotatably supported around a rotation axis, a stator, the rotor and the stator, and a plurality of reamers at an end. A rotation provided with a frame in which a hole is formed, and an end cover in which an end cover side through hole is formed at a position corresponding to each of the plurality of reamer holes, with each end of the frame in the rotational axis direction closed. An end cover coupling method for coupling the frame and the replacement end cover when removing the end cover and attaching the replacement end cover of the electric machine,
And end cover machining step of forming the end cover side through hole in the end cover for the replacement, if the reamer bolts to each of the plurality of reamer hole is not fitted, the reamer bolts to each of the plurality of reamer holes A reamer bolt mounting step for fitting, an end cover loading step for loading the replacement end cover on the frame after the end cover machining step and the reamer bolt mounting step; and a fitting member after the end cover loading step A fitting member fitting step for fitting each of the reamer bolts, and a fixing step for fixing the replacement end cover and the fitting member to each other.

ADVANTAGE OF THE INVENTION According to this invention, the end cover coupling | bonding method which can perform the punching process of the end cover of a rotary electric machine independently can be obtained.

It is an elevation sectional view showing the composition of the rotary electric machine concerning an embodiment. It is a front view which removes and shows only an end cover. It is a side view which shows the edge part and end cover of a flame | frame. It is a longitudinal cross-sectional view which shows the reamer bolt used for the coupling | bonding of an end cover. It is a longitudinal cross-sectional view which shows the fitting member used for the coupling | bonding of an end cover. It is a longitudinal cross-sectional view which shows the end cover coupling structure which concerns on embodiment. It is a flowchart which shows the procedure of the end cover coupling | bonding method at the time of end cover replacement | exchange concerning embodiment. It is a flowchart which shows the procedure of the method of the end cover removal and reattachment which concern on embodiment. It is a longitudinal cross-sectional view which shows the connection structure of the conventional end cover.

  Hereinafter, a rotating electrical machine, an end cover coupling structure, and an end cover coupling method according to embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an elevational sectional view showing the configuration of the rotating electrical machine according to the embodiment. The rotating electrical machine 100 includes a rotor 10 and a stator 20. The rotor 10 includes a rotor shaft 11 extending in the rotation axis direction and a rotor core 12 provided on the radially outer side of the rotor shaft 11. The stator 20 has a stator core 21 and a stator winding 22. The stator core 21 is provided on the radially outer side of the rotor core 12 and has a cylindrical shape. The stator winding 22 penetrates through a slot (not shown) that is formed radially inward of the stator core 21 at intervals in the circumferential direction and extends in the rotation axis direction.

  The rotor core 12 and the stator 20 are surrounded by a frame 40 disposed on the radially outer side. End covers 50 are attached to both ends of the frame 40 in the rotation axis direction. The end cover 50 is attached to the frame 40 by coupling the flange portion 51 of the end cover 50 and the frame 40 via the end cover coupling structure 60 (FIG. 2). The end cover coupling structure 60 will be described in detail in the description of FIG.

  The two bearings 30 that rotatably support both ends of the rotor shaft 11 are supported by a bearing base 32, respectively. The bearing stands 32 are each supported by the frame 5. The end cover 50 is formed with a rotor shaft through hole 53 which is a circular opening through which the rotor shaft 11 passes. A gap 53 a is interposed between the rotor shaft through hole 53 and the rotor shaft 11.

  In the frame 5, the part of the rotating electrical machine 100 sandwiched between the bearing bases 32 on both sides, that is, the lower part of the frame 40 and most of the end covers 50 on both sides in the rotational axis direction is opened.

  Fans 15 are respectively attached to the rotor shafts 11 on both sides in the rotation axis direction with the rotor core 12 interposed therebetween. A fan guide 52 is provided on the radially outer side of the fan 15 via a fan guide gap 52a. The fan guide 52 is supported by the end cover 50.

  A suction port 58 is formed below each of the outer sides of the end cover 50 in the direction of the rotation axis of the fan 15. A discharge port 59 is formed at the bottom of the frame 40.

  FIG. 2 is a front view showing only the end cover removed. FIG. 3 is a side view showing the end of the frame and the end cover.

  The end cover 50 and the frame 40 are coupled by a plurality of end cover coupling structures 60.

  FIG. 4 is a longitudinal sectional view showing a reamer bolt used for joining the end covers. The reamer bolt 61 has a rod shape with a circular cross section, and has a reamer portion that has an outer diameter that fits into the reamer hole 40a (see FIG. 6) at one side portion in the longitudinal direction and fits into the reamer hole 40a. 61a is formed. Moreover, the thread part 61b is formed in the surface in the other one side part of the longitudinal direction of the reamer bolt 61. FIG. The reamer portion 61a has an outer surface shape and dimension management, and has a smooth surface.

  FIG. 5 is a longitudinal sectional view showing a fitting member used for coupling the end covers. The fitting member 65 has a cylindrical part 65a having a cylindrical shape and a plate-like part 65b connected to an end portion in the axial direction of the cylindrical part 65a. The plate-like portion 65b projects outward in the radial direction from the cylindrical portion 65a. The plate-like portion 65b has a polygon (for example, hexagonal) in cross section (not shown) perpendicular to the axial direction in consideration of workability during tightening.

  A through hole is formed in the cylindrical portion 65a and the plate-like portion 65b along the central axis. The through hole is composed of a reamer hole 65c formed in the vicinity of the axial end portion of the central axis and an enlarged hole 65d formed in other portions. The reamer hole 65 c is fitted with the reamer portion 61 a of the reamer bolt 61. The enlarged hole 65d has an inner diameter larger than the inner diameter of the reamer hole 65c. The reamer hole 65c and the enlarged hole 65d are formed concentrically.

  FIG. 6 is a longitudinal sectional view showing the end cover coupling structure according to the embodiment. The end cover coupling structure 60 includes a reamer bolt 61, a fitting member 65, a tightening nut 62, and an adjustment member 63. In addition, since the adjustment member 63 has a function like a spacer for adjusting the mutual position with the longitudinal direction of the reamer bolt 61, it may not be necessary.

  A reamer hole 40 a is formed in the frame 40 and is fitted with a reamer bolt 61. An end cover 50 in which an end cover side through hole 55 is formed is disposed on the outer surface of the frame 40. The end cover side through hole 55 is substantially concentric with the reamer hole 40 a of the frame 40. However, the reamer hole 40a of the frame 40 and the end cover side through hole 55 do not have to be strictly concentric.

  On the opposite side of the frame 40 across the end cover 50, there is provided an adjustment member 63 having a plate shape and having an adjustment member side through hole 63a formed at the center. The adjustment member side through hole 63 a is formed to have the same diameter as the end cover side through hole 55. The adjustment member 63 is for adjusting the relative position of the reamer bolt 61 with respect to the longitudinal direction.

  Here, the magnitude relationship of the diameter of each element will be described. The diameters of the end cover side through hole 55 formed in the end cover 50 and the adjustment member side through hole 63a formed in the adjustment member 63 are at least as accurate as the outer diameter of the cylindrical portion 65a of the fitting member 65. 2 times larger. Here, the processing accuracy is larger than the case where the center position when the end cover side through hole 55 is formed based on the drawing is integrally formed with the end cover 50 and the frame 40a. Say that. The plate-like portion 65 b of the fitting member 65 has an outer diameter that is sufficiently larger than the diameters of the end cover side through hole 55 formed in the end cover 50 and the adjustment member side through hole 63 a formed in the adjustment member 63. Alternatively, it is formed in a planar size.

  The fitting member 65 is fitted in the reamer hole 65c with a reamer bolt 61 fitted in the reamer hole 40a. A plate-like portion 65 b of the fitting member 65 sandwiches the end cover 50 via the adjustment member 63. The adjustment member 63 is sent to the site in a state in which the adjustment member 63 is attached to the end cover 50 by the welded portion 67 in advance. Further, the adjustment member 63 and the fitting member 65 are coupled to each other by the welded portion 68. That is, the adjustment member 63 and the fitting member 65 are integrated with the end cover 50. Each of welded portion 67 and welded portion 68 may be fillet welded, for example. Further, as long as the bonding strength can be ensured, it may be scattered in the circumferential direction.

  In this state, the male thread portion 61 b of the reamer bolt 61 protrudes from the center of the plate-like portion 65 b of the fitting member 65. A tightening nut 62 is attached to the male thread portion 61 b of the reamer bolt 61 protruding from the center of the plate-like portion 65 b of the fitting member 65.

  FIG. 7 is a flowchart showing a procedure of the end cover coupling method when the end cover is replaced according to the embodiment. That is, after the end cover is removed, the same thing is not attached again, but the end cover 50 is newly manufactured and attached.

  First, the end cover side through hole 55 is formed in the replacement end cover 50 (step S01). The position of the center axis of the end cover side through hole 55 of the end cover 50 is processed so as to be concentric with the center axis of the reamer hole 40a of the frame 40 according to the drawing. However, since the holes are not drilled by the actual matching, there is a possibility that when the end cover 50 is attached to the frame 40, the position of the center axis of the reamer hole 40a of the frame 40 may be shifted within the range of processing accuracy. .

  Next, the reamer bolt 61 is press-fitted into the reamer hole 40a of the frame 40 and is fitted (step S02). Here, it is assumed that the removal of the end cover 50 before replacement is completed and the reamer bolts 61 are all removed for curing. However, since the end cover 50 can be removed and attached without removing the reamer bolt 61, this step S02 is not necessary if the reamer bolt 61 is not removed.

  Next, the replacement end cover 50 is loaded on the frame 40 (step S03). At this time, the position of the end cover 50 is not set using the reamer bolt 61 but based on the respective shapes and the mutual positional relationship.

  Next, the reamer portion 61a of the reamer bolt 61 is fitted into the reamer hole 65c of the fitting member 65 after the adjustment member 63 is sandwiched (step S04). After the adjustment member 63 and the fitting member 65 attached to the end cover 50 are brought into close contact with each other, the adjustment member 63 and the fitting member 65 are joined to each other by welding (step S05). As a result, the fitting member 65, the adjustment member 63, and the end cover 50 are integrated.

  Next, the tightening nut 62 is screwed into the male thread portion 61b of the reamer bolt 61, and the end cover 50 integrated with the fitting member 65 and the adjustment member 63 is tightened via the reamer bolt 61 (step S06). .

  FIG. 8 is a flowchart showing the procedure of the method of removing and reattaching the end cover. In order to realize the coupling configuration by the end cover coupling structure 60 shown in FIG. 6, it is necessary to perform the procedure shown in FIG. FIG. 8 shows a procedure for removing the end cover 50 and then reattaching it in the case of inspection or the like in the configuration of coupling by the end cover coupling structure 60 configured as described above.

  First, the reamer bolt 61 is pulled out from the frame 40, and the end cover 50 is removed (step S11). Specifically, the tightening nut 62 is further tightened. That is, when the tightening nut 62 is further tightened, the tightening force for the end cover 50 is increased, and the pulling force for pulling the reamer bolt 61 from the reamer hole 40 a of the frame 40 is increased. The reamer bolt 61 can be pulled out from the frame 40 by using this pulling force. As a result, the fitting member 65 and the end cover 50 coupled thereto are removed together with the reamer bolt 61.

  With the end cover 50 removed, the inside of the frame 40 can be accessed, and inspection and the like are performed (step S12).

  When the inspection or the like is completed, the reamer bolt 61 is then press-fitted into the reamer hole 40a of the frame 40 (step S13). In this case, it is assumed that the fitting member 65 taken out integrally with the reamer bolt 61 in step S11 and the end cover 50 coupled thereto are removed from the reamer bolt 61.

  Next, the end cover 50 to which the fitting member 65 is attached is attached (step S14). That is, the position of the end cover 50 is set and press-fitted so that the reamer bolt 61 passes through the reamer hole 65 c of the fitting member 65 fixed to the end cover 50.

  This indicates that the conventional method can be used in the same manner as in the case of attaching the end cover in which the reamer holes are formed by matching the actual products.

  As described above, according to this embodiment, the reamer hole 65c of the fitting member 65 is concentric with the reamer hole 40a of the frame 40, and then the relative position between the fitting member 65 and the end cover side through hole 55 is set. Since it can be determined, the drilling of the end cover 50 of the rotating electrical machine 100 can be performed independently without requiring actual matching.

[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. Furthermore, the embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention.

  The embodiments and the modifications thereof are included in the invention described in the claims and the equivalents thereof as well as included in the scope and gist of the invention.

  DESCRIPTION OF SYMBOLS 5 ... Frame, 10 ... Rotor, 11 ... Rotor shaft, 12 ... Rotor core, 15 ... Fan, 20 ... Stator, 21 ... Stator core, 22 ... Stator winding, 30 ... Bearing, 32 ... Bearing stand 40 ... Frame, 40a ... Reamer hole, 50 ... End cover, 50a ... Reamer hole, 51 ... Flange, 52 ... Fan guide, 52a ... Fan guide gap, 53 ... Rotor shaft through hole, 53a ... Gap, 55 ... End Cover side through hole, 58 ... suction port, 59 ... discharge port, 60 ... end cover coupling structure, 61 ... reamer bolt, 61a ... reamer part, 61b ... male screw part, 62 ... tightening nut, 63 ... adjustment member, 63a ... Adjusting member side through hole, 65 ... Fitting member, 65a ... Cylindrical part, 65b ... Plate-like part, 65c ... Reamer hole, 65d ... Enlarged hole, 67, 68 ... Welding part, 100 ... Rotating electric machine

Claims (3)

A rotor have a b Tashafuto and the rotor core is rotatably supported about a rotation axis, the stator and the frame in which a plurality of reamer hole in the end portion accommodating the rotor and the stator are formed When, wherein the end portion of the rotation axis direction of the frame closed, respectively, of the rotary electric machine and a end cover end cover side through holes are formed at positions corresponding to each of the plurality of reamer hole, said end cover An end cover coupling method for coupling the frame and the replacement end cover when removing the replacement end cover,
An end cover processing step of forming the end cover side through-hole in the replacement end cover;
When a reamer bolt is not fitted to each of the plurality of reamer holes, a reamer bolt mounting step for fitting a reamer bolt to each of the plurality of reamer holes;
After the end cover processing step and the reamer bolt mounting step, an end cover loading step of loading the replacement end cover onto the frame;
After the end cover loading step, a fitting member fitting step for fitting a fitting member to each of the reamer bolts;
A fixing step of fixing the replacement end cover and the fitting member to each other;
An end cover coupling method characterized by comprising: The fitting member fitting step further includes a step of sandwiching an adjustment member for adjusting the mutual position of the reamer bolt with the longitudinal direction between the replacement end cover and the fitting member,
The fixing step includes a step of coupling the replacement end cover and the adjustment member, and fixing the adjustment member and the fitting member to each other.
The end cover coupling method according to claim 1. 2. The nut tightening step of tightening the tightening nut by screwing a tightening nut with a threaded portion of the reamer bolt after the fitting member fitting step. Item 3. The end cover coupling method according to Item 2.

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