JPS58163246A - Rotor pulling and disassembling method of rotary electric machine - Google Patents

Abstract

PURPOSE:To make maintenance inspection of a generator easy, by a method wherein the generator is elevated by a jack and turned and then a rotor is pulled out. CONSTITUTION:Connecting portions between a rotation shaft of a generator 1 and both turbines 2, 3 are disassembled, and the generator 1 is elevated by a jack so that the connecting portion of the rotation shaft of the generator 1 is disposed above the connecting portion of both turbines 2, 3. A direction turning device 5 is installed under the elevated generator 1, and axial position of the generator 1 is changed by the direction turning device 5 and then a rotor 4 of the generator 1 is pulled. In this constitution, the rotor 4 can be pulled and disassembled in the generator separately without disassembling and removing either of the turbines 2, 3 at the pulling side, thereby the maintenance and inspection of the generator is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for extracting and disassembling the rotor of a rotating electric machine, and more particularly to a method for extracting and disassembling the rotor of a rotating electric machine in which a gas turbine, a generator, and a steam turbine are sequentially connected on one shaft.

Conventionally, when a steam turbine and a generator or a gas turbine and a generator are connected individually, the rotor of the generator is pulled out and disassembled by separating the generator 1a and the turbine 2a as shown in FIG. While still installed, rotor 3
The extraction work was easy because it could be pulled out to the side opposite to the turbine 2a as indicated by the arrow in the figure.

However, among the combined plants that have been attracting attention as energy-saving plants in recent years, there are some that attach importance to operability and connect a cast turbine and a steam turbine on the left and right sides of a generator on the same axis.

In the case of a combined plant like this, where a gas turbine, a generator, and a steam turbine are sequentially connected on a shaft, applying the conventional work method to pull out the rotor of the generator is difficult. The turbine gets in the way, and one of the turbines on the side that pulls out the generator rotor must be disassembled and removed. This increases the number of man-hours required for maintenance and inspection of the generator, which has the disadvantage of causing a long-term shutdown of the entire plant2.By the way, the locations where this type of power generation equipment is installed usually do not have large cranes installed. So, the entire generator cannot be hung. There is only a 50t crane that can lift the generator rotor (approximately 40t) by itself.

The present invention has been made in view of the above points, and an object thereof is to provide a method for pulling out and disassembling the rotor of a rotating electric machine, which allows easy maintenance and inspection of a generator of a -shaft combined plant.

That is, the present invention involves removing the connecting portion between the rotating shaft of the rotating electric machine and the rotating shafts of both turbines so that the connecting portion of the rotating electric machine's rotating shaft is located on the opposite side of the connecting portion of the rotating shaft of the turbine. The rotating electrical machine was raised upwards, a direction changing device was installed at the bottom of the raised rotating electrical machine, and the direction changing device changed the axial position of the rotating electrical machine before the rotor of the rotating electrical machine was pulled out. It is characterized by this.

The present invention will be fully explained below based on the illustrated embodiments. An embodiment of the present invention is shown in FIGS. 2-4.

Note that parts that are the same as those in the conventional model are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, the connecting portion between the rotating shaft of a rotating electric machine, for example, a generator 1 and both turpis/2.3 (cass turbine 2, steam turbine 3) is removed, and the connecting portion of the rotating shaft of the generator 1 is removed from both sides. The generator 1 is raised upward so that it is located above the joint between the rotating shafts of the turbines 2 and 3, and the direction change device 5 is installed at the bottom of the raised generator 1. After converting the axial position of generator 1, the rotor 4 of generator 1 was pulled out. By doing this, it becomes possible to pull out and disassemble the rotor 4 from the generator 1 alone without disassembling and removing either of the turbines 2 and 3 on the extraction side, making maintenance and inspection of the generator 1 easy. can do. That is, the connection between the generator 1 and both turbines 2 and 3 is removed, and the generator 1 is jacked up as shown by the two-dot chain line in the figure (hereinafter referred to as jack-up) (see Figure 2). ).

At this time, raise the generator 1 until the connection part is located above the connection part of both turbines 2 and 3. Next, a direction changing device 5 is installed below the jacked-up generator 1 (see FIG. 4). After installation, the direction changing device 5 is used to change the direction of the generator 1 as shown by the arrow in the figure, so that the rotor 4 is positioned so that the axial position of the generator 1 is as shown by the two-dot chain line in the figure. Place it in a position where it can be pulled out (see Figure 3). After doing this, the rotor 4 is pulled out using a crane or the like as shown by the two-dot chain line in the figure. The rotor 4 can be pulled out with the direction changing device 5 still attached, and when reinserted after maintenance and inspection, the above-mentioned procedure can be reversed.

It can be removed by changing the amount of directional movement.

Furthermore, in this embodiment, the direction changing device 5 is installed after the generator 1 is jacked up, but it may be installed in advance at the lower part of the generator 1.

As described above, in the present invention, the direction of the jacked-up generator is changed using the direction changing device before the rotor is pulled out, so that the generator can be pulled out without disassembling and removing the turbine on the side to be pulled out. Therefore, it is possible to obtain a rotor extraction and disassembly method for a rotating electrical machine that facilitates maintenance and inspection of the generator, and facilitates maintenance and inspection of the generator of a -shaft combined plant.

[Brief explanation of drawings]

Fig. 1 is a side view of a turbine and a generator showing the rotor being pulled out in the conventional rotor pull-out disassembly method for a rotary electric machine, and Fig. 2 is a jack-up of the generator in an embodiment of the rotor pull-out disassembly method for a rotary electric machine according to the present invention. FIG. 3 is a side view of a gas turbine, a generator, and a steam turbine showing the change in direction of the generator of one embodiment. FIG. 4 is a plan view of a gas turbine generator and a steam turbine of another embodiment. FIG. 3 is a side view of the generator showing the attachment of the direction changing device.

Claims (1)

[Claims] 1. A method for pulling out and disassembling the rotor of a rotating electric machine in which the rotating shafts of both of these turbines and the rotating shafts thereof are connected on one axis between a cast turbine and a steam turbine,
removing the connecting portion between the rotating shaft of the rotating electric machine and the rotating shafts of both turbines, and moving the rotating electric machine so that the connecting portion of the rotating shaft of the rotating electric machine is located above the connecting portion of the rotating shaft of the turbine; A direction changing device is installed at the bottom of the rotating electric machine, and the rotor of the rotating electric machine is pulled out after changing the axial position of the rotating electric machine with this direction changing device. Characteristic rotor extraction and disassembly method for rotating electric machines.