JP2011010400A - Rotating electrical machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow machining accuracy of an installation part to be lowered and the assembling man-hours to be reduced, when an upper structure is installed on a stator frame and to take countermeasures against the vibration of a tab machine.SOLUTION: The tab machine includes the stator frame with a stator incorporated therein, and the upper structure provided at the upper part of the stator frame. A gasket is placed in an area where the upper surface of the stator frame and the lower surface of the upper structure are abutted against each other. A mounting bracket provided at the upper structure and a part of the stator frame are fastened together with a screw. The mounting bracket is so set that the position of the lower surface thereof is lower than the position of the upper surface of the gasket.

Description

  The present invention relates to a rotating electrical machine such as a turbine generator, and more particularly to an upper structure such as a cooler cover in which a cooler for cooling heat generated by the rotating electrical machine is incorporated in the upper part of the rotating electrical machine, and a ventilation duct for dissipating the generated heat. The present invention relates to a rotating electrical machine in which is incorporated.

  The rotating electrical machine generates vibration and heat by the rotation. For this reason, various measures are taken so that vibration is not transmitted to the outside of the stator frame in which the stator of the rotating electrical machine is incorporated.

  For heat, a cooler is installed at the top of the stator frame to cool the generated heat. Specifically, a cooler cover is attached to the upper part of the stator frame, and the cooler is fixed to the cooler cover. Here, the connection between the stator frame and the cooler cover is usually performed by bolting.

  As a publicly known example, Patent Document 1 discloses a technique in which a bolt is tightened with a flange structure while taking anti-vibration measures when an outer fan cover of a cooler is attached to a stator frame.

JP-A-6-261493

In many rotating electric machines, a cooler cover is installed on the upper part of the stator frame for air cooling, and a flange structure using a large number of bolts is used for this attachment.
However, in the flange structure, it is necessary to match the bolt hole of the flange and the bolt hole of the stator frame, and it is necessary to improve the processing accuracy. In addition, since many bolts are used, it takes time to tighten the bolts. Furthermore, there was a problem that vibrations were easily transmitted unless anti-vibration measures were taken.

  In addition to the cooler, various structures (for example, ventilation ducts) may be attached to the upper part of the rotating electrical machine, and it is necessary to solve the above problems when attaching the upper structure in a broad sense to the stator frame. there were.

  In view of the above, an object of the present invention is to provide a rotating electrical machine that can reduce machining accuracy and assembly man-hours and can take measures against vibration.

In the present invention, in a rotating electrical machine having a stator frame incorporating a stator therein, and an upper structure provided on the upper part of the stator frame,
A gasket is arranged at the part where the upper surface of the stator frame and the lower surface of the upper structure abut, and the mounting bracket provided on the upper structure and a part of the stator frame are screwed together and attached. The lower surface position of the metal fitting was made lower than the upper surface position of the gasket.

  According to the present invention, since the gasket is crushed by the weight of the cooler cover itself, which is the upper structure, it is attached to the stator frame, so it does not require much processing accuracy, the number of bolts can be reduced, and the assembly man-hour can be reduced, and Vibration measures can be taken at the same time.

The figure which shows the whole structure of a stator frame and a cooler cover attachment Enlarged cross-sectional view of stator frame and cooler cover attachment before bolt fastening Enlarged cross-sectional view of stator frame and cooler cover attachment after tightening bolts The figure which shows the 1st alternative of the whole structure of a stator frame and a cooler cover attachment The figure which shows the 2nd alternative of the whole structure of a stator frame and a cooler cover attachment Enlarged sectional view showing a second alternative of the stator frame and the cooler cover mounting portion

Examples of the present invention will be described in detail below.

  FIG. 1 is a diagram showing an overall configuration of a rotating electrical machine according to the present invention, and mainly describes a stator frame and a cooler cover mounting portion.

  As is apparent from FIG. 1, the stator frame 1 has a stator (not shown) incorporated therein, and a cooler cover 4 is installed on the top thereof. A cooler 3 is incorporated in the cooler cover 4. A gasket 7 is laid on the joint surface where the cooler cover 4 and the stator frame 1 are in contact. In this figure, reference numeral 2 denotes a rotor of the rotating electrical machine.

  FIG. 2 is an enlarged view of a mounting portion of the support metal fitting 5 and the attachment metal fitting 6 in the AA cross section of FIG. 1, and shows a state before bolting is performed. As is clear from this enlarged view, the cooler cover support fitting 5 is attached to the stator frame 1, and the cooler cover attachment fitting 6 is attached to the cooler cover 4 at a position on the cooler cover side facing the cooler cover support fitting 5. ing. In addition, the cooler cover support bracket 5 and the cooler cover mounting bracket 6 are configured to be fastened by bolts 8 and nuts 9 via vibration-proof rubber 11 therebetween. Reference numeral 10 denotes an anti-vibration rubber seat. FIG. 2 shows a positional relationship before bolting, and the gasket 7 has an original thickness.

  In FIG. 2, the support metal 5 is fixed to the stator frame 1 and the mounting metal 6 is fixed to the cooler cover 4. In the stator frame 1, the upright plate portion 1 a and the horizontal plate 1 b portion are integrally formed, and in the cooler cover 4, the upright plate portion 4 a and the horizontal plate 4 b portion are integrally formed.

  FIG. 3 shows a state after bolting the same part as FIG. 2, and the gasket 7 laid on the part where the upper surface of the stator frame 1 and the lower surface of the cooler cover 4 are in contact is crushed by the weight of the cooler cover. ing. What is characteristic in the cross-sectional view of FIG. 3 is the relationship between the upper surface position of the gasket 7 and the upper surface position of the anti-vibration rubber 11, and the latter is clearly at a lower position. In the present invention, the lower end surface of the cooler cover mounting bracket 6 (that is, the upper surface position of the anti-vibration rubber 11) is determined so as to be in the positional relationship after bolt fastening. As a result, with this structure, a thick gasket is crushed only by positional deviation and sealed. Therefore, the cooler cover 4 is supported only by the support fitting 5. In this embodiment, screws are fixed between the mounting bracket 6 of the cooler cover 4 and the support bracket 5 which is a part of the stator frame.

  If the height position of the cooler cover 4 that crushes the gasket 7 is the same as or lower than the joint height position of the support bracket, the gasket may be completely crushed and vibrations are transmitted. It becomes easy.

  Further, according to the present invention, as is apparent from FIG. 1, the position of the cooler cover mounting bracket 6 and the cooler cover support bracket 5 is set according to the weight of the cooler cover or the seismic load on each surface. A suitable number is sufficient. This means that machining can be performed without requiring high machining accuracy, and the number of bolts used may be small, so that the number of assembly steps can be reduced.

  FIG. 4 is a diagram showing a first alternative of the overall configuration of attaching the stator frame and the cooler cover. This is an embodiment when a plurality of cooler covers 4 are provided on the upper portion of the stator frame 1, and each cooler cover 4 is individually attached to the stator frame 1. In these embodiments, the cooler cover 4 is attached to the upper portion of the stator frame 1. However, it goes without saying that this can be similarly realized even in a structure such as a ventilation duct. These can be said to be superstructures in a common concept.

  1 and 4 show an example in which the cooler cover mounting bracket 6 and the cooler cover support bracket 5 are coupled so as to protrude outside from the mounting surface. However, in terms of safety structure or transportation of the structure From the viewpoint, it is better not to have a protruding portion.

  For this reason, on the entire structure of FIG. As shown in a partially enlarged view in FIG. 6, the cooler cover mounting bracket 6 on the cooler cover 4 side is installed in the recess 15, but the function of the cooler cover support bracket 5 on the stator frame 1 side is the stator frame 1. The upper surface of is substituted. In this embodiment, screws are fixed between the mounting bracket 6 of the cooler cover 4 and the horizontal plate 1b on the upper surface of the stator frame which is a part of the stator frame.

  In the present invention, the gasket is a general term for an air leakage prevention material or a wind plug material, and a rubber plate or sponge rubber can be used.

Summarizing the effects of the present invention, the following can be said.
In terms of assembly, the bolting operation is greatly reduced. The operation of attaching the cooler cover 4 on the stator frame 1 can be shortened because the assembly tolerance is easier than in the conventional structure (flange structure). Bolt hole machining is reduced for machining. Mechanical tolerance can be relaxed because the seam of the seam is sealed with a thick gasket. In flange processing, it was necessary to make a clean surface within ± 1 mm by machining.

  Further, in the present invention, the weight of the cooler cover 4 is received at the bolted joint portion, and no load is received at the gasket portion. Accordingly, the structure is such that vibration is not easily transmitted.

  The present invention is suitable as a fixing method when an upper structure is provided on a stator frame, and is suitable for use in a rotating electric machine.

1: Stator frame 2: Rotor 3: Cooler 4: Cooler cover 5: Cooler cover support bracket 6: Cooler cover mounting bracket 7: Sponge gasket 8: Bolt 9: Nut 10: Anti-vibration rubber seat 11: Anti-vibration rubber 15 : Depression

Claims (7)

In a rotating electrical machine having a stator frame in which a stator is incorporated, and an upper structure provided on the top of the stator frame,
A gasket is disposed at a portion where the upper surface of the stator frame and the lower surface of the upper structure are in contact with each other, and is screwed between a mounting bracket provided on the upper structure and a part of the stator frame. The rotating electrical machine is characterized in that a lower surface position of the mounting bracket is lower than an upper surface position of the gasket. In the rotating electrical machine according to claim 1,
A rotating electrical machine characterized in that it is performed via a vibration isolating material when screwing between the mounting bracket and a part of the stator frame. In the rotating electrical machine according to claim 1,
The rotating electrical machine characterized in that the superstructure is a cooler cover to which a cooler for dissipating heat generated in the rotating electrical machine is attached. In the rotating electrical machine according to claim 1,
The rotating electrical machine is characterized in that the upper structure is an exhaust duct for dissipating heat generated by the rotating electrical machine. In the rotating electrical machine according to claim 1,
A part of the stator frame is an upper surface of the stator frame. In the rotating electrical machine according to claim 1,
A part of the stator frame is a support fitting attached to the stator frame. In the rotating electrical machine according to claim 1,
The rotating electrical machine according to claim 1, wherein the mounting bracket provided in the upper structure is provided in a recessed portion of the upper structure.

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