JPH058773Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a vertical shaft rotating electrical machine, particularly to an improvement in rotor extraction.

[Prior Art] Fig. 3 is a sectional view of a conventional vertical shaft rotating electric machine, showing the state before the rotor is pulled out, and Fig. 4 is a sectional view showing the state shown in Fig. 3, with the rotor being pulled out. In the figure, 1 is a stator frame, and a stator core 2 around which a stator coil is wound is attached to the inner peripheral side of the stator frame. 3 is an upper bracket, 4 is a lower bracket, and 5 is a rotor shaft, the lower end of which is fitted with a coupling ring 6. 7 is a rotor core fixed to the rotor shaft 5 via a spider 8, 9 is a lower oil weir, 10 is a lower bearing, 11 is a labyrinth seal,
30 is an upper bearing; 12 is a bolt for fastening the upper and lower brackets 3 and 4 to the stator frame 1; and 13 is a hanging hole provided in the upper bracket 3.

Next, the operation will be explained. In the vertical shaft rotating electrical machine configured as described above, when the rotor is pulled out, the coupling 6 fitted to the rotor shaft 5 is first heated and removed. Next, the lower oil weir 9, lower bearing 10, and labyrinth seal 11, which are parts surrounding the lower bearing, are sequentially removed. Next, remove the bolts 12 that fasten the upper bracket 3 and stator frame 1. In this state, as shown in FIG. 4, the hanging hole 13 of the upper bracket 3 and the crane hook 14 are
Hang the wire 15 on the rotor and attach it to the upper bracket 3.
It is lifted up together with the stator and pulled out from the stator.

[Problems to be solved by the invention] Since the conventional vertical shaft rotating electric machine is constructed as described above, when the rotor is pulled out, the coupling must be removed.
Reinstallation requires extremely high assembly precision, which requires a great deal of time and skill.Furthermore, there are problems such as the mating surface with the rotor shaft becoming abraded and easily scratched when installing and removing the coupling. It was hot.

This invention was made in order to solve the above-mentioned problems, and the object is to obtain a vertical shaft rotating electrical machine whose rotor can be pulled out without removing the coupling.

[Means for solving problems]

In the vertical shaft rotating electric machine according to this invention, the outer diameter of the lower bracket is made smaller than the inner diameter of the stator core, a lower bracket support is provided on the stator frame, and the lower bracket is attached to the lower bracket. And a hanging hole is provided in the rotor spider.

[Effect]

In the vertical shaft rotating electric machine according to this invention, the rotor can be pulled out with the lower bracket suspended from the rotor spider while the coupling ring and lower bearing portion are still attached.

[Example of idea]

An embodiment of this invention will be described below with reference to the drawings. In FIGS. 1 and 2, reference numeral 16 denotes a lower bracket, and the outer diameter of this lower bracket is smaller than the inner diameter of the stator core 2 by δ2. A plurality of lower bracket supports 17 are provided on the inner peripheral side of the stator frame 1, and the lower brackets 16 are tightened and fixed with bolts 18. 19 is a closing plate, 20 is a suspension hole provided in the lower bracket 16, and 21 is a suspension hole provided in the rotor spider, which faces the suspension hole 20 in the lower bracket.

Note that the other configurations are the same as those of the prior art, so explanations will be omitted.

Next, the operation will be explained. In the vertical shaft rotating electrical machine configured in this manner, when the rotor is pulled out, the closing plate 19 is first removed, and the wires 22 are hung through the hanging holes 20 and 21, as shown in FIG. Next, remove the mounting bolts 12 between the upper bracket 3 and the stator frame 1 and the mounting bolts 18 between the lower bracket 16 and the lower bracket support 17, and insert the wire 1 into the hanging hole 13 of the upper bracket 3.
Multiply by 5 and pull out the rotor. Of course, in this case, as shown in FIG. 2, the coupling ring 6 is pulled out while remaining attached to the rotor shaft. Further, since the lower bearing part is fastened to the lower bracket 16, it can be similarly pulled out while remaining attached to the rotor shaft.

The reason why the rotor is pulled out by suspending the lower bracket to which the lower bearing part is attached to the spider will be explained below.

In this vertical shaft rotating electric machine, as shown in Fig. 1, the upper bearing 30 is made up of a thrust bearing and a guide bearing and bears the thrust load and the radial load, and the lower bearing 10 is made of the guide bearing and bears only the radial load. . This radial load is applied to the lower bearing 10 and lower bracket 16 that support the rotor shaft 5.
For this reason, these parts are made sturdily from thick steel plates, etc., and are also heavy.

In comparison, the lower oil weir 9 is for storing lubricating oil and is usually made of a thin steel plate.

When the bracket 16 is separated from the stator frame 1, since the lower bearing 10 is a guide bearing, it is movable in the axial direction with respect to the rotor shaft 5.
As a result, the lower bearing portion slides down, and the oil weir 9, to which the weight of the lower bearing portion (including the lower bracket) is applied, hits the coupling ring 6, causing the oil weir to bend and cause oil leakage. There is a risk that this may occur.

Also, the guide bearing can only support the rotor shaft if it is supported by a bracket, but if the bracket is not fixed to the stator frame,
The relationship between the guide bearing and the rotor shaft will become unstable, and there is a risk of damage to the bearing or the rotor shaft. Furthermore, the adjusted clearance between the guide bearing and the rotor shaft may become unbalanced and need to be readjusted.

For the reasons mentioned above, when the rotor is pulled out, the lower bracket is separated from the stator frame, so the lower bracket is suspended.

In addition, in the above embodiment, wires were used for 15 and 22, but 22 may be a hanging tool such as a chain block, and 15 may be a chain block or a dedicated hanging tool. .

[Effect of idea]

As described above, according to this invention, in a vertical shaft rotating electric machine in which a coupling is attached to the lower end of the rotor shaft and the lower bearing is a guide bearing, the outer diameter of the lower bracket to which the lower bearing is tightened can be calculated from the stator core. The inner diameter of the lower bracket is smaller than the inside diameter of the spider, and the lower bracket can be pulled out together with the rotor using a wire or the like while the coupling remains fixed. Therefore, the lower bracket can be suspended from the spider using a hanging tool such as a wire. Simply holding the rotor will make lifting the rotor easier and avoid damaging the lower bearing.
This has excellent practical effects, such as being able to significantly shorten the time for pulling out and reassembling without having to make any readjustments after pulling out, and also eliminating the need for special consideration for accuracy.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a vertical shaft rotating electric machine according to an embodiment of this invention, Fig. 2 is a sectional view showing a state in which the rotor shown in Fig. 1 is pulled out, and Fig. 3 is a sectional view showing a conventional vertical shaft rotating electric machine. 4 are sectional views showing a state in which the rotor shown in FIG. 3 is pulled out. 1...Stator frame, 2...Stator core, 3
... Upper bracket, 5 ... Rotor shaft, 6 ... Coupling, 7 ... Rotor core, 8 ... Rotor spider, 9 ... Lower oil weir, 10 ... Lower bearing, 1
1... Labyrinth seal, 13... Hanging hole, 1
5...Wire, 16...Lower bracket, 17...
... Lower bracket support, 20 ... Hanging hole, 21
...Hoisting hole, 22...Wire, 30...Upper bearing. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A stator frame having a stator core attached to the inner circumferential side, a rotor shaft rotatably disposed on the inner circumferential side of the stator core and having a coupling ring attached to the lower end, and a rotor shaft fixed to the rotor shaft. a rotor having a rotor core fitted into a spider; an upper bracket and a lower bracket removably fastened to both ends of the stator frame; and a rotor fastened to the upper bracket to support the rotor. In a vertical shaft rotating electric machine comprising an upper bearing and a lower bearing comprising a guide bearing that is tightened to the lower bracket and receives the radial load of the rotor, the outer diameter of the lower bracket is smaller than the inner diameter of the stator core. At the same time, holes for hanging are formed in the spider and the lower bracket, and the lower bracket with the lower bearing tightened is suspended from the spider by a hanging tool. A vertical shaft rotating electrical machine characterized by being able to be pulled upward from within the stator frame.