JP6211919B2 - Rotor moving method - Google Patents

Description

  Embodiments described herein relate generally to a rotor moving method for moving a rotor with respect to a stator of a generator, and an air caster used in the rotor moving method.

  For relatively large generators used in power stations, etc., when installing or performing periodic inspections, the rotor is pivoted against the stator, such as when the rotor is inserted into the stator or when the rotor is removed from the stator. Need to move in the direction. When performing the operation of moving the rotor in such a generator, conventionally, after the rotor is lifted by a crane or the like, an underlay plate is inserted into the stator and a rotor shoe is inserted between the rotor and the stator. The rotor is moved in the axial direction with respect to the stator by sliding on the base plate.

  Patent Document 1 below discloses an air caster that floats a heavy object by air pressure when moving a large object.

JP 2004-10256 A

  In the conventional method as described above, when the rotor is moved with respect to the stator, the heavy plate rotor is lifted by a crane or the like, and an underlay plate is inserted into the stator or the rotor shoe is inserted into the rotor. It is necessary to perform insertion or the like, and it is necessary to apply a lubricant such as wax between the base plate and the rotor shoe. In addition, in order to move the rotor in the axial direction, it is necessary to pull the rotor with a winch or the like. For this reason, it is necessary to secure a work space for installing a winch, a crane, etc., and there is a problem that labor required for work is large.

  Therefore, in the generator as described above, when the rotor is moved in the axial direction with respect to the stator, such as when the rotor is inserted into the stator or when the rotor is removed from the stator, the labor required for the work is reduced. Therefore, there is a demand for a new technique that can be further reduced.

  Embodiments of the present invention have been made in view of the above, and provide a rotor moving method and an air caster capable of moving a rotor in an axial direction with respect to a stator while suppressing labor required for work. The purpose is to do.

In order to achieve the above-described object, a rotor moving method according to an embodiment of the present invention is a rotor moving method in which a rotor is moved in an axial direction with respect to a stator of a generator, and the air supplied from an air supply source is An air caster capable of discharging to the stator side, and is attached between the inner peripheral surface of the stator and the outer peripheral surface of the rotor and below the outer peripheral surface, and is curved along the outer peripheral surface. A contact member having a contact surface, and a discharge port provided on a side opposite to the contact surface of the contact member and capable of discharging air supplied from the air supply source toward the inner peripheral surface of the stator An air caster having an air discharge member between the inner peripheral surface of the stator and the outer peripheral surface of the rotor so that the discharge port faces the inner peripheral surface. Placed on the underside That the step, the steps of towards the air supply to the inner peripheral surface of the stator from the discharge port of the air discharge member of the air casters to feed air to the air casters ejecting air, the And moving the rotor together with the air caster by applying an axial force to the rotor while air is being discharged from the air caster to the stator side.

  According to the embodiment of the present invention, when the rotor is moved, since air is discharged from the air caster to the stator side, the frictional force acting between the air caster moving with the rotor and the stator is generated. Can be reduced. When the rotor is moved in the axial direction with respect to the stator, the labor required for the work can be further reduced.

It is a section elevation showing an example of the dynamo to which the rotor moving method of a 1st embodiment is applied, and the state where the rotor is located in the stator is shown. It is a cross-sectional view which shows schematic structure of the air caster of 1st Embodiment, and has shown the state attached to the rotor. It is the external view which looked at the air caster of 1st Embodiment from the air discharge member side. It is sectional drawing of the air caster of 1st Embodiment, and is sectional drawing by the IV-IV line of FIG. It is a section elevation showing an example of a dynamo to which the rotor moving method of a 1st embodiment is applied, and shows the state where a rotor was moved to the collector side a predetermined distance from the inside of a stator. It is a section elevation showing an example of a dynamo to which a rotor moving method of a 1st embodiment is applied, and shows a state where a rotor was moved to the turbine side for a predetermined distance from the outside of a stator. It is a schematic diagram explaining the place where an air caster is arrange | positioned in the rotor moving method of 2nd Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited to the embodiments described below, and various modifications can be made without departing from the scope of the invention.

[First Embodiment]
First, a schematic configuration of a generator to which the rotor moving method of the present embodiment is applied will be described with reference to FIG. FIG. 1 is a sectional elevation view showing an example of a generator to which the rotor moving method of the present embodiment is applied, and shows a state where the rotor is located in the stator.

  Note that the central axis of rotation of the rotor constituting the generator, that is, the axis of the rotor is indicated by a point A or an alternate long and short dash line A in the figure. In addition, the direction in which the central axis extends is simply referred to as “axial direction”. A direction orthogonal to the axial direction is simply referred to as a “radial direction”. The generator is installed so that the axial direction coincides with the horizontal direction.

  In FIG. 1, the vertical upper side of the generator is indicated by an arrow U, and the vertical lower side is indicated by an arrow D. In addition, the side on which the turbine is provided in the axial direction described above is referred to as “turbine side” and is indicated by an arrow T in the figure. On the other hand, the side opposite to the turbine side in the axial direction is simply indicated as “collector side” and indicated by an arrow C in the figure.

  As shown in FIG. 1, the generator 1 includes a stator 10, a rotor 20 disposed in the stator 10, and a turbine-side bearing bracket 3 as a bearing bracket that rotatably supports the rotor 20 with respect to the stator 10. And a collector-side bearing bracket 4. In the present embodiment, the generator 1 is provided in a steam power plant, and a rotor of a turbine (not shown) is coupled to the rotor 20.

  The stator 10 has a coil 12 in which a field winding is wound around an iron core. A radially inner surface (hereinafter referred to as an inner peripheral surface) 13 of the coil 12 faces the rotor 20 with a predetermined gap therebetween.

  The rotor 20 has a portion (hereinafter referred to as a coil facing portion) 22 facing the coil 12. A radially outer surface (hereinafter referred to as an outer peripheral surface) 23 of the coil facing portion 22 is opposed to the inner peripheral surface 13 of the stator 10 described above with a predetermined gap therebetween. A flange 26 connected to a turbine rotor (not shown) is formed on the rotor 20 on the axial turbine side (indicated by an arrow T in the drawing) from the coil facing portion 22. Note that the end of the rotor 20 on the axial collector side (indicated by an arrow C in the figure) is indicated by reference numeral 28.

  In the generator 1 configured as described above, for example, when performing periodic inspection or the like, it is necessary to remove the rotor 20 from the stator 10. That is, it is necessary to move the rotor 20 located in the stator 10 to the axial collector side so as to be located outside the stator 10.

[Configuration of air caster]
When the rotor 20 is moved with respect to the stator 10, in this embodiment, an instrument that discharges air in a predetermined direction (hereinafter referred to as an air caster) is attached to the rotor 20. Below, the structure of the air caster of this embodiment is demonstrated using FIGS.

  FIG. 2 is a transverse sectional view showing a schematic configuration of the air caster of the present embodiment, and shows a state where the air caster is attached to the rotor. FIG. 3 is an external view of the air caster according to the present embodiment as viewed from the air discharge member side. FIG. 4 is a cross-sectional view of the air caster of the present embodiment, and is a cross-sectional view taken along line IV-IV in FIG. The circumferential direction around the central axis C of the rotor is simply referred to as “circumferential direction” and is indicated by an arrow E in the figure.

  As shown in FIG. 2, the air caster 50 has a plate shape that curves along the coil facing portion 22 of the rotor 20, and a member that contacts the coil facing portion 22 (hereinafter referred to as a contact member) 52. have. The contact member 52 is curved along the outer peripheral surface 23 of the coil facing portion 22, and has a surface (hereinafter referred to as a contact surface) 51 that contacts the outer peripheral surface 23. In a state where the contact surface 51 is in contact with the outer peripheral surface 23, the contact member 52 is configured to extend in the circumferential direction of the coil facing portion 22. In the present embodiment, the contact member 52 is configured as a rigid body.

  A member (hereinafter referred to as an air discharge member) 55 that discharges air in a predetermined direction is provided on the opposite side of the contact member 52 from the contact surface 51. The contact member 52 has a surface (hereinafter referred to as an attachment surface) 53 for attaching the air discharge member 55 on the side opposite to the contact surface 51. In the air caster 50 of this embodiment, as shown in FIG. 3, for example, three air discharge members 55 are fixed to the mounting surface 53 of the contact member 52.

  The air discharge member 55 is configured to be able to receive supply of air from an air pump 60 as an air supply source, as indicated by a dashed arrow A1 in FIG. The air pump 60 and the air discharge member 55 are connected by an air hose or the like (not shown). When the air pump 60 is operated in a state where the air caster 50 is attached to the coil facing portion 22, the air discharge member 55 receives supply of air from the air pump 60.

  As shown in FIG. 4, the air discharge member 55 is a member having a torus shape and having an air chamber 56 formed therein. In this embodiment, the air discharge member 55 is configured as an elastically deformable bag-shaped member. The air discharge member 55 has one side of a direction (hereinafter, referred to as a torus axis direction) in which the central axis of the torus shape (shown by a one-dot chain line G) extends, coupled to the mounting surface 53, and air from the other side. Is discharged.

  The air discharge member 55 receives an air chamber 56 that is supplied with air from an air pump 60 (see FIG. 2), and an opening that discharges the air supplied to the air chamber 56 toward the inner peripheral surface 13 of the stator 10 (hereinafter referred to as the air discharge member 55). , Indicated as discharge port) 57. The air discharge member 55 discharges air supplied to the air chamber 56 from the discharge port 57 toward the inner peripheral surface 13 of the stator 10 (indicated by a two-dot chain line in the drawing). Thereby, the frictional force acting between the air discharge member 55 and the inner peripheral surface 13 can be reduced as compared with the case where air is not discharged from the discharge port 57.

[Rotor movement 1]
A rotor moving method using the air caster 50 configured as described above will be described with reference to FIGS. FIG. 5 is a sectional elevation view showing an example of a generator to which the rotor moving method of the present embodiment is applied, and shows a state in which the rotor is moved from the stator to the axial collector side by a predetermined distance. . In FIG. 5, the distance between the rotor and the stator is shown large for easy understanding.

  First, the case where the rotor 20 is pulled out from the stator 10, that is, the case where the rotor 20 located in the stator 10 is moved outward in the axial direction so as to be located outside the stator 10 will be described with reference to FIGS. As shown in FIG. 1, the rotor 20 before movement is located in the stator 10, and the coil facing portion 22 faces the coil 12.

  In this state, the above-described air caster 50 is disposed vertically below the coil facing portion 22. In the air caster 50, the contact surface 51 (see FIG. 4) of the contact member 52 is in contact with the outer peripheral surface 23 of the rotor facing portion 22, and the discharge port 57 of the air discharge member 55 faces the inner peripheral surface 13 of the coil 12. To place. Thereby, the air caster 50 can discharge air toward the coil 12. At this time, it is preferable that a plurality of air casters 50 are arranged in the coil facing portion 22 of the rotor 20 while changing the position in the axial direction.

  Then, the air pump 60 (see FIG. 2), which is an air supply source, is operated and air is supplied from the air pump 60 to the air caster 50, whereby the air is discharged from the discharge port 57 of the air discharge member 55 toward the coil 12. To discharge.

  Thereby, the force produced between the air discharge member 55 of the air caster 50 and the inner peripheral surface 13 of the coil 12 of the stator 10 can be reduced. When air is discharged in a relatively large amount, the rotor 20 can be floated with respect to the stator 10.

  Before moving the rotor 20 in the axial direction, the turbine side bearing bracket 3 and the collector side bearing bracket 4 are removed from the rotor 20. FIG. 1 shows a state where the collector-side bearing bracket 4 is removed from the rotor 20. The turbine side bearing bracket 3 is also removed from the rotor 20 similarly to the collector side bearing bracket 4.

  The bearing brackets 3 and 4 are removed from the rotor 20 and air is discharged from the air discharge member 55 of the air caster 50 toward the inner peripheral surface 13 of the stator 10 in the axial direction. By applying a force, the rotor 20 is moved together with the air caster 50 toward the axial collector side (indicated by an arrow C in the figure).

  For example, the rotor 20 can be moved to the axial collector side by applying a pressing force (indicated by an arrow P1 in the figure) to the flange 26 shown in FIG. As a method of applying a pressing force to the flange 26 toward the axial collector side, for example, there is a method in which an operator or the like pushes the flange 26 toward the axial collector side.

  It is also preferable to move the rotor 20 by applying a force (indicated by an arrow P2 in the drawing) that pulls toward the collector side end portion 28 in the axial direction. As a method of applying a force to the collector-side end portion 28 toward the axial collector side, for example, there is a method of pulling the collector-side end portion 28 toward the axial collector side with a winch (not shown).

  By applying a force toward the axial collector side to the rotor 20, the rotor 20 located in the stator 10 can be moved out of the stator 10. When the rotor 20 is moved, air is discharged to the stator 10 side from the air discharge member 55 of the air caster 50 that moves together with the rotor 20, so that friction acts between the air caster 50 and the stator 10. The force can be reduced. Compared with the case where the air caster 50 is not used, the force applied to the rotor 20 in the axial direction can be made relatively small. In addition, when the rotor 20 and the air caster 50 can be levitated with respect to the stator 10 by the air discharged from the air discharge member 55, the rotor 20 is moved in the axial direction only by an operator's human power. It becomes possible.

  In the present embodiment, air casters 50B, 50C, and 50D are also arranged on the lower side of the rotor 20 other than the coil facing portion 22 in the vertical direction. The air casters 50B, 50C, and 50D are configured to have substantially the same function as the air caster 50. The air caster 50B is disposed between the coil 12 and the coil 12 in the step of moving the rotor 20 in the axial direction. Similarly, the air casters 50 </ b> C and 50 </ b> D are also disposed between the base 9 provided outside the stator 10 in the step of moving the rotor 20 in the axial direction.

[Rotor movement 2]
Next, a case where the rotor 20 is inserted into the stator 10, that is, a case where the rotor 20 positioned outside the stator 10 is moved inward in the axial direction so as to be positioned inside the stator 10 will be described with reference to FIG. 6. FIG. 6 is a sectional elevation view showing an example of a generator to which the rotor moving method of the present embodiment is applied, and shows a state where the rotor is moved from the outside of the stator to the axial turbine side by a predetermined distance. .

  The rotor 20 before moving is located outside the stator 10. At this time, it is lifted by a wire 8 (see FIG. 1) or a crane (not shown). Then, the rotor 20 is inserted from the flange 26 into the coil 12 of the stator 10. By applying an axial force to the rotor 20, the rotor 20 is moved to the axial turbine side (indicated by an arrow T in the figure).

  For example, the rotor 20 can be moved to the axial turbine side by applying a force (indicated by an arrow P3) to the axial turbine side with respect to the collector side end portion 28 shown in FIG. Further, the rotor 20 can be moved into the stator 10 by applying a force (indicated by an arrow P4 in the drawing) that pulls the flange 26 toward the axial turbine side.

  At this time, the air casters 50 and 50B are disposed between the rotor 20 and the coil 12 and vertically below the rotor 20. While moving the rotor 20 toward the axial turbine side, the air caster 50B is disposed between the coil 12 and the rotor 20, and then the air caster 50 is disposed between the coil 12 and the coil facing portion 22 of the rotor 20. . Air is supplied from an air pump 60, which is an air supply source, to the air casters 50 and 50B disposed between the coil 12 and the rotor 20, and the air is discharged to the stator 10 side.

  In the present embodiment, air casters 50 </ b> C and 50 </ b> D are arranged other than between the coil 12 and the rotor 20. The air casters 50C and 50D are disposed between the air casters 50C and 50D and the base 9 provided outside the stator 10 in the step of moving the rotor 20 to the axial turbine side.

  When the rotor 20 is moved to the axial turbine side, air is discharged to the stator 10 side from the air casters 50 and 50B that move together with the rotor 20, so that the frictional force acting between the stator 10 and the stator 10 is generated. Can be reduced.

  As described above, in the rotor moving method of the present embodiment, the air caster 50 capable of discharging the air supplied from the air supply source (air pump 60) to the stator 10 side is used as the coil 12 of the stator 10 of the rotor 20. There is a step of disposing it on the vertical lower side of the coil facing portion 22 facing the. Further, in the rotor moving method of the present embodiment, air is supplied from the air supply source to the air caster 50 to discharge air from the air caster 50 toward the coil 12, and the air is transferred from the air caster 50 to the stator 10 side. The step of moving the rotor 20 together with the air caster 50 by applying an axial force to the rotor 20 while the air is being discharged is included.

  When the rotor 20 is moved, air is discharged from the air caster 50 to the stator 10 side. Thereby, the frictional force which acts between the air caster 50 moving with the rotor 20 and the stator 10 can be reduced. When the rotor 20 and the air caster 50 can be lifted with respect to the stator 10 by the air discharged from the air caster 50, it is possible to move the rotor 20 in the axial direction only by an operator's human power. Thus, when the rotor 20 is moved in the axial direction with respect to the stator 10, the labor required for the work can be further reduced.

  In the rotor moving method of the present embodiment, the air casters 50, 50B, 50C, and 50D are arranged vertically below the rotor 20. However, the place where the air caster according to the present invention is arranged is as follows. It is not limited to this aspect. Below, the example is demonstrated.

[Second Embodiment]
A rotor moving method according to the second embodiment will be described with reference to FIG. FIG. 7 is a schematic diagram for explaining a place where an air caster is arranged in the rotor moving method according to the second embodiment. In addition, about the structure substantially common to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the step of arranging the air casters of the rotor moving method of the present embodiment, the air casters 50, 50 E, 50 F, 50 G are arranged in the circumferential direction of the coil facing portion 22. An air caster 50 is arranged on the vertical lower side of the coil facing portion 22 as in the first embodiment. In addition, in the present embodiment, an air caster 50E is disposed on one side of the coil facing portion 22 in the horizontal direction (indicated by an arrow H in the drawing), and an air caster 50F is disposed on the other side. Further, an air caster 50G is disposed vertically above the coil facing portion 22.

  When the air casters 50, 50E, 50F, and 50G are arranged in the circumferential direction of the coil facing portion 22 in this way, the rotor 20 is moved in the axial direction (the axis of the rotor is indicated by a point A in the figure). In addition, the outer peripheral surface 23 of the coil facing portion 22 can be prevented from coming into contact with the inner peripheral surface 13 of the coil 12. It is possible to prevent the coil 12 and the coil facing portion 22 from being damaged during the movement of the rotor 20.

[Other Embodiments]
In each of the embodiments described above, the air caster 50 includes the contact member 52 that contacts the rotor 20 and the air discharge member 55 that discharges air to the stator 10 side, but the air caster according to the present invention. However, the embodiment is not limited to this. In the air caster, for example, a surface of the air discharge member 55 opposite to the side on which the discharge port 57 is formed (that is, the surface on the rotor 20 side) may be a contact surface in contact with the rotor 20.

  Although several embodiments of the present invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel 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. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Generator 3 Turbine side bearing bracket 4 Collector side bearing bracket 8 Wire 9 Base 10 Stator 12 Coil 13 Inner peripheral surface 20 Rotor 22 Coil opposing part 23 Outer peripheral surface 26 Flange 28 Collector side edge part 50, 50B, 50C, 50D, 50E , 50F, 50G Air caster 51 Contact surface 52 Contact member 53 Mounting surface 55 Air discharge member 56 Air chamber 57 Discharge port 60 Air pump (air supply source)

Claims (5)

A rotor moving method for moving a rotor in an axial direction with respect to a stator of a generator,
An air caster capable of discharging air supplied from an air supply source to the stator side, and is attached between the inner peripheral surface of the stator and the outer peripheral surface of the rotor and below the outer peripheral surface. A contact member having a contact surface curved along the outer peripheral surface, and air supplied from the air supply source provided on the opposite side of the contact member to the inner surface of the stator. An air caster having a discharge port capable of discharging toward the peripheral surface, and the inner peripheral surface of the stator and the outer periphery of the rotor so that the discharge port faces the inner peripheral surface A step of arranging between the surface and below the outer peripheral surface ;
Supplying air from an air supply source to the air caster and discharging air from the discharge port toward the inner peripheral surface of the stator among the air discharge members of the air caster;
Moving the rotor together with the air caster by applying an axial force to the rotor while air is being discharged from the air caster to the stator side;
A rotor moving method comprising: The rotor moving method according to claim 1, wherein, in the moving step, the rotor located in the stator is moved in the axially outer side or the axially inner side. In the arranging step, the air casters are arranged in a circumferential direction along the outer peripheral surface of the rotor.
3. The rotor moving method according to claim 1, wherein the rotor is moved. The air discharge member has a torus shape in a direction in which the central axis of the torus extends.
One side in a certain torus axial direction is a surface of the contact member opposite to the contact surface.
It is connected to the surface and discharges air from the other side in the torus axial direction.
The rotor moving method according to any one of claims 1 to 3, wherein: The air discharge member has an air chamber that receives supply of air from an air supply source,
The discharge port discharges air supplied to the air chamber toward the inner peripheral surface of the stator.
The rotor moving method according to claim 4 .

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