JP5138560B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine in which, for example, a turbine covering a frame surrounding a stator, such as a turbine generator, is provided with a manhole for inspecting the interior of the machine.

  In a large rotating electrical machine such as a turbine generator, a completely enclosed frame structure is adopted to suppress a temperature rise due to electrical loss and mechanical loss, and high-pressure refrigerant gas sealed inside the frame is used. It is cooled by circulating through a gas cooler by a fan attached to the rotor. An internal space is formed between the inner peripheral surface of the frame and the outer peripheral surface of the stator. At least one ring-shaped reinforcing plate for suppressing deformation is fixed to the inner peripheral surface of the frame, and the inner space is rotated. It is divided in the axial direction of the child. In order to perform maintenance work such as inspection and cleaning of the lower half of the frame, a plurality of manholes are provided for accessing each of the divided internal spaces below the frame. As a conventional technique for improving the maintenance work of the structure as described above, in the multi-casing turbomachine, the upper half part of the upper and lower divided inner casings coupled to each other via the coupling member is placed in the outer casing. There is one that can be repaired or maintained in all casings by lifting and entering from one manhole provided in the outer casing (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-343813 (first page, FIG. 2)

  In recent years, rotating electrical machines have been required to reduce manufacturing costs by reducing the physique and simplifying the structure due to soaring materials. Providing many manholes in the frame leads to an increase in the mass and manufacturing cost of the rotating electrical machine, and also increases the possibility of foreign matter entering the frame, so inspection or cleaning work inside the frame with fewer manholes There is a demand for a frame structure that enables this. In the prior art such as Patent Document 1, it is necessary to dispose the lifting device for the upper half of the inner casing and the receiving device for the lifting device in the upper half of the inner casing, which complicates the structure. There was a problem of increased costs.

  The present invention has been made in view of the above circumstances, and an object thereof is to obtain a rotating electrical machine that has a simple structure, does not require special equipment, and can reduce the number of manholes.

The rotating electrical machine according to the present invention rotates a frame provided so as to surround and surround the outer peripheral surface of the stator, and an inner space formed by the inner peripheral surface of the frame and the outer peripheral surface of the stator. At least one reinforcing member that is arranged so as to be divided into a plurality in the axial direction of the child and is fixed to the inner peripheral surface of the frame, and a manhole that is provided so that the internal space can be accessed from the outside of the frame during maintenance. In the rotating electrical machine provided, the reinforcing member is formed with a number of manholes less than the number of the divided internal spaces by providing a through portion that communicates between the adjacent internal spaces . A door for opening and closing the penetrating portion is provided .

In the present invention, since the reinforcing member that divides the internal space is provided with a through portion that communicates between the adjacent internal spaces, there is no need to provide a manhole for each divided internal space, and the number of manholes is reduced. Can be reduced. Further, the structure is simple, and it is not necessary to make a significant structural change to the frame or add a special device. And since the door which opens and closes the penetration part is provided, the ventilation state of the refrigerant gas circulated by the cooling fan can be made the same as that without the penetration part by closing the door during operation of the rotating electrical machine. can do. For this reason, there is no need to worry about air turbulence inside the frame, changes in the ventilation state due to increase or decrease in pressure loss, or changes in cooling efficiency or temperature due to such changes.

Embodiment 1 FIG.
1-3 is a figure explaining the principal part of the rotary electric machine which concerns on Embodiment 1 of this invention, FIG. 1 is a longitudinal cross-sectional view of the axial direction which shows typically the whole structure of this rotary electric machine, FIG. FIG. 3 is a perspective view showing a lower half portion of the frame shown in FIG. 1, and FIG. 3 is a perspective view of the lower half portion of the frame shown in FIG. The figure shows the case where the rotating electrical machine is a turbine generator, and each figure except for FIG. 1 schematically shows only the lower half when a cylindrical frame is cut horizontally along a substantially central axis. It shows. In the figure, a rotating electrical machine 1 includes a rotor 3 in which a predetermined portion inside both ends is rotatably supported by a bearing 2, a cylindrical stator core 4 surrounding the rotor 3 with a gap, The stator core 4 is surrounded by an internal space 5 (5a to 5d), and the internal space 5 is sealed, and a cylindrical frame (casing) 6 for holding the bearing 2 and the stator 3 is provided. Yes.

  Inside the frame 6, ring-shaped reinforcing plates 7 (7 a to 7 c) as reinforcing members for suppressing deformation due to the pressure of the filled refrigerant gas or the like and increasing rigidity are provided in the inner space 5 through the rotor 3. Are arranged so as to be divided into internal spaces 5a, 5b, 5c and 5d, and their outer peripheral surface portions are fixed to the inner peripheral surface of the frame 6 by welding or the like. The lower portion of the reinforcing plate 7 fixed to the frame 6 is provided so as to communicate with internal spaces 5a to 5d divided in the axis A direction of the rotor 3 as shown in FIGS. In addition, a through portion 8 (8a to 8c) for maintenance is formed.

  And the manhole 9 (9a, 9b) for an operator to access at the time of a maintenance is provided in two places corresponding to the internal spaces 5a and 5d, respectively, and is provided in the position corresponding to the internal spaces 5b, 5c. Not. In the first embodiment, the penetrating portion 8 is formed so as to cut away a part of the ring-shaped reinforcing plate 7 in the circumferential direction. The cooling fan attached to the rotor 3, the gas cooler for cooling the refrigerant gas circulating inside the frame 6, the field coil, the armature coil, the lid of the manhole 9, etc. are the same as the conventional ones. Is omitted.

Next, the operation of the first embodiment configured as described above will be described. Inside the frame 6 of the rotating electrical machine 1, a refrigerant gas such as hydrogen or nitrogen having a high pressure of about 10 ⁵ to 10 ⁶ Pa is sealed, and gas cooling is performed by a fan (not shown) attached to the rotor 3. The inside of the frame 6 is circulated through a vessel to suppress the temperature rise of the components inside the frame 6 due to electrical loss and mechanical loss. When performing maintenance such as inspection inside the frame 6 or cleaning work, the operation of the rotating electrical machine 1 is stopped and the refrigerant gas is replaced with air, and then the lid of the manhole 9 not shown is opened.

  Specifically, for the internal spaces 5a and 5d, for example, tools (not shown) such as cleaning tools, reflecting mirrors, and illumination devices are directly inserted from the manholes 9a and 9b, and the operator can enter from the outside of the frame 6 or substantially. The upper body is placed in the internal space 5a or 5d. On the other hand, with respect to the internal spaces 5b and 5c, tools inserted from the manhole 9 are inserted into the adjacent internal space 5b or 5c on the back side through the penetrating portion 8, and if necessary, the internal spaces 5a or 5d. Various maintenance operations are carried out by putting the upper body or the whole body into and accessing the internal space 5b or 5c.

  The number of the reinforcing plates 7 is determined from the design requirements by the capacity of the rotating electrical machine 1 and the pressure of the refrigerant gas to be filled. For example, when the capacity is increased by at least one small-sized one, For example, 4 or more sheets may be used. In addition, the number of penetrating portions 8 provided in the reinforcing plate 7 and the number of manholes 9 provided in the frame 6 may be anything as long as all the internal spaces 5 (5a to 5d) divided by the reinforcing plate 7 can be accessed. For example, in the first embodiment, when the penetrating portions 8a to 8c are fully utilized, the two manholes 9 may be only one of them. Further, in the case where the manholes 9a and 9b are fully utilized, it is possible not to provide the through portion 8b provided in the central reinforcing plate 7b among the three through portions 8a to 8c. Since the rigidity of the frame 6 is increased, it is advantageous in terms of strength.

  As described above, according to the first embodiment, the three reinforcing plates 7a to 7c provided in the frame 6 are provided with a part of the reinforcing plate 7 in the circumferential direction that can access the internal spaces 5a to 5d during maintenance. Since the through portions 8a to 8c formed so as to be excised are provided, the number of manholes 9 can be reduced. As a result, an increase in the mass and manufacturing cost of the rotating electrical machine due to the conventional manholes provided in four locations corresponding to the internal spaces 5a to 5d can be suppressed, and the possibility of foreign matter entering the frame 6 is also reduced. The effect that it can be made low is acquired. Therefore, it can be used for a longer period. Moreover, since the structure is simple, it is not necessary to make a significant structural change to the frame 6 or to add a special device such as a lifting device, so that the device can be reduced in weight and the environmental load in the production process can be reduced. It can also be reduced.

Embodiment 2. FIG.
4 and 5 are diagrams for explaining a main part of the rotating electrical machine according to the second embodiment of the present invention. FIG. 4 is a perspective view showing a lower half portion of the frame, and FIG. 5 is a frame shown in FIG. The perspective view which looked down at the lower half part from another angle is shown. In addition, the same code | symbol has shown the same or equivalent part through each embodiment and each figure. In the figure, a ring-shaped reinforcing plate 7 (7a to 7c) provided inside the frame 6 has a notch formed in a lower part of the figure, with a part of the outer peripheral portion of the reinforcing plate 7 being cut away. Part 8 (8a to 8c) is provided. Since other configurations are the same as those of the first embodiment, description thereof is omitted.
In the second embodiment configured as described above, the same effects as those of the first embodiment can be obtained, and the reinforcing plate 7 is continuously connected in the circumferential direction at the through portion 8, so that the frame 6 There is a remarkable advantage that it is easy to ensure the rigidity. The penetrating portion 8 (8a to 8c) may be provided on the inner peripheral side of the ring-shaped reinforcing plate 7.

Embodiment 3 FIG.
6 and 7 are views for explaining the main part of the rotating electrical machine according to Embodiment 3 of the present invention. FIG. 6 is a perspective view showing the lower half of the frame, and FIG. 7 is a view of the frame shown in FIG. The perspective view which looked down at the lower half part from another angle is shown. In the figure, an ellipse provided in the lower part of the figure of the ring-shaped reinforcing plate 7 (7a to 7c) provided inside the frame 6 so as to penetrate the central portion in the width direction of the reinforcing plate 7 in the axial direction. Each of the penetrating portions 8 (8a to 8c) is formed by a hole. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  In the third embodiment configured as described above, the same operational effects as in the first embodiment can be obtained, and the reinforcing plate 7 of the penetrating portion 8 can be provided on both the outer peripheral side and the inner peripheral side in the radial direction. The continuous connection in the circumferential direction increases the rigidity of the reinforcing plate 7 and the outer peripheral portion of the reinforcing plate 7 can be welded to the inner peripheral surface of the frame 6 over the entire length. Is more easily secured, and deformation of the frame 6 can be easily suppressed.

Embodiment 4 FIG.
8 and 9 are views for explaining the main part of the rotating electrical machine according to Embodiment 4 of the present invention. FIG. 8 is a perspective view showing the lower half of the frame, and FIG. 9 is a view of the frame shown in FIG. The perspective view which looked down at the lower half part from another angle is shown. In the drawing, the lower part of the figure of the ring-shaped reinforcing plate 7 (7a to 7c) is a penetration made of a cutout portion having a shape in which a part of the outer peripheral portion of the reinforcing plate 7 is cut off as in the second embodiment. Part 8 (8a to 8c) is provided. The through-holes 8a and 8c at both ends are provided with doors 10 that can be opened and closed to close the openings. In addition, the structure which can open and close the door 10 is not specifically limited, For example, from a slide type thing, the thing by a hinge, or what is simply fixed to the reinforcement board 7 with fixing means, such as a volt | bolt, at the time of closing It can be selected as appropriate. Since other configurations are the same as those of the second embodiment, description thereof is omitted.

  In the fourth embodiment configured as described above, the through portion 8 provides the ventilation state of the refrigerant gas circulated by the cooling fan (not shown) by closing the door 10 during operation of the rotating electrical machine. It can be similar to those that are not. For this reason, there is no need to worry about air turbulence inside the frame 6, changes in ventilation state due to increase or decrease in pressure loss, or changes in cooling efficiency or temperature due to such changes. In addition, the door 10 is opened at the time of maintenance such as inspection work and cleaning work, and the same operation and effect can be obtained by the same operation as in the second embodiment. It should be noted that the door 10 may be provided in all of the through portions 8 or only at one place. Moreover, the shape of the penetration part 8 is not specifically limited, For example, it can also provide in the shape like Embodiment 1 or Embodiment 3.

Embodiment 5 FIG.
10 and 11 are diagrams for explaining the main part of the rotating electrical machine according to the fifth embodiment of the present invention. FIG. 10 is a perspective view showing the lower half of the frame, and FIG. 11 is the frame shown in FIG. The perspective view which looked down at the lower half part from another angle is shown. In the figure, a ring-shaped reinforcing plate 7 (7a, 7b, 7c) not provided with a penetrating portion is fixed to the inner peripheral surface of the frame 6 so as to divide the internal space 5 in the axial direction of the rotor. The manhole 9a is formed so as to straddle the adjacent internal spaces divided in the axial direction, with the reinforcing plate 7a as the center and the manhole 9b, with the reinforcing plate 7c as the center. It should be noted that the size of the manholes 9a and 9b should be such that the operator can access the internal spaces 5a to 5c from the semicircular portion divided by the reinforcing plates 7a or 7c. For example, it is preferable that the manholes 9a and 9b have an elliptical shape that is long in the axial direction or an elliptical shape. Since the other basic configuration of the rotating electrical machine is the same as that of the first embodiment, description thereof is omitted.

  In the fifth embodiment configured as described above, when the lid (not shown) of the manhole 9a is opened at the time of maintenance such as inspection work and cleaning work, any side of the internal spaces 5a and 5b adjacent to each other is opened. Is also opened directly to the external space and can access both the internal spaces 5a and 5b. Further, when the lid of the opened manhole 9a is closed, the ventilation state by the reinforcing structure inside the frame 6 becomes substantially the same as that of the conventional structure, so that the turbulence of the air, the change of the ventilation state due to increase / decrease in pressure loss, etc. No need to worry. Further, there is an advantage that additional processing is not necessary for the reinforcing plate 7. Further, when the reinforcing plate 7 is welded to the inner peripheral surface of the frame 6, it is easy to recover the strength reduction caused by the disconnection at the manhole 9a.

  In the first to fifth embodiments, the case where the present invention is applied to a turbine generator has been described, but it is needless to say that the present invention is not necessarily limited thereto.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view in an axial direction schematically showing an overall configuration of a rotary electric machine according to Embodiment 1 of the present invention. The perspective view which shows the lower half part of the flame | frame shown by FIG. The perspective view which looked down at the lower half part of the flame | frame shown by FIG. 1 from another angle. The perspective view which shows the frame lower half part of the rotary electric machine which concerns on Embodiment 2 of this invention. The perspective view which looked down at the lower half part of the flame | frame shown by FIG. 4 from another angle. The perspective view which shows the flame | frame lower half part of the rotary electric machine which concerns on Embodiment 3 of this invention. The perspective view which looked down at the lower half part of the flame | frame shown by FIG. 6 from another angle. The perspective view which shows the flame | frame lower half part of the rotary electric machine which concerns on Embodiment 4 of this invention. The perspective view which looked down at the lower half part of the flame | frame shown by FIG. 8 from another angle. The perspective view which shows the flame | frame lower half part of the rotary electric machine which concerns on Embodiment 5 of this invention. The perspective view which looked down at the lower half part of the flame | frame shown by FIG. 10 from another angle.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Rotating electrical machine, 2 Bearing, 3 Rotor, 4 Stator core, 5 (5a-5d) Internal space, 6 Frame, 7 (7a-7c) Reinforcement plate (reinforcement member), 8 (8a-8c) Through part, 9 (9a, 9b) Manhole, 10 doors.

Claims (4)

A frame provided to surround and surround the outer peripheral surface of the stator and an inner space formed by the inner peripheral surface of the frame and the outer peripheral surface of the stator are divided into a plurality of portions in the axial direction of the rotor. A rotating electric machine comprising: at least one reinforcing member arranged as described above and fixed to the inner peripheral surface of the frame; and a manhole provided so that the internal space can be accessed from the outside of the frame during maintenance, The reinforcing member is provided with a penetrating portion communicating with the adjacent internal spaces so that the number of manholes is less than the number of the divided internal spaces, and a door for opening and closing the penetrating portion is provided. rotary electric machine characterized by comprising.   2. The rotating electrical machine according to claim 1, wherein the penetrating portion is formed so as to cut away a part of the reinforcing member in the circumferential direction.   2. The rotating electrical machine according to claim 1, wherein the penetrating portion includes a notch portion in which a part of the outer peripheral side portion or the inner peripheral side portion of the reinforcing member is cut off.   The rotating electrical machine according to claim 1, wherein the penetrating portion includes a through hole penetrating in a center portion in the width direction of the reinforcing member in the axial direction.

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