JPH0452059B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to an improvement in a water-cooled rotor having a water-cooled rotor winding wound around a cylindrical rotor core in a turbine generator or the like. .

[Technical background of the invention]

Water-cooled rotor windings (hereinafter referred to as windings) in bipolar turbine generators, etc., and a cylindrical rotor core (hereinafter referred to as iron core) around which the windings are wound. In a cooled rotor (hereinafter referred to as rotor), the N at the magnetic poles is
A magnetic connection is made between the pole and the south pole.

FIG. 1 is a vertical cross-sectional view schematically showing the winding ends of a rotor of a two-pole turbine generator as described above. In FIG. 1, 1 is a winding wire formed with a hollow part through which cooling water can flow.
are molded by baking mica, asbestos, etc.
Alternatively, it is held by a retaining ring 3 via an insulating cylinder 2 made of an insulating material such as reinforced plastic (FRP). 4 and 5 are N-pole and S-pole windings of the winding 1 having portions to be connected between poles.

Further, FIG. 2 is a perspective view showing the end portion of the winding in FIG. 1. In FIG. 2, the same parts as in FIG. 1 are given the same reference numerals. 4a in Figure 2
5a is the N-pole winding end portion of the N-pole winding 4 wound on the outermost layer, and 5a is the S-pole winding end portion of the S-pole winding 5 wound on the outermost layer. The N-pole winding end portion 4a and the S-pole winding end portion 5a are connected with a connection dimension T by an inter-pole connecting member 6 made of a conductor such as copper.

[Problems with background technology]

By the way, when the turbine generator is operated and the rotor rotates, the retaining ring 3
The inner diameter of is increased by several millimeters. Further, the thickness of the insulating tube 2 is also compressed by the centrifugal force acting on the N-pole and S-pole windings 4 and 5. Therefore, when the rotor is at rest and when it is rotating, the position of the inter-electrode connecting member 6 changes, and its connection dimension T changes, and when the rotor is rotating, the connection dimension T is larger than when it is at rest.

Therefore, the inter-electrode connecting member 6 undergoes repeated expansion and contraction phenomena and is subjected to repeated fatigue when the generator is started and stopped. When repeated fatigue acts on the interelectrode connecting member 6, cracks occur,
Eventually, the line broke and the generator became inoperable.

In order to prevent the generation of cracks in the inter-electrode connecting member 6, conventionally, as shown in FIG.
Flexibility was increased by forming a curved portion or by overlapping multiple thin copper plates to absorb repeated expansion and contraction phenomena.
However, in the case of a water-cooled rotor winding in which cooling is performed by flowing cooling water through the hollow parts of the windings 4 and 5, the above-mentioned curved part is formed. Alternatively, it is difficult to form a hollow part in the inter-electrode connecting member 6, which is constructed by stacking a plurality of thin copper plates, and water cooling has not been possible. Therefore, compared to the windings 4 and 5 that have hollow parts, the interelectrode connecting member 6 has a poor cooling effect and heats up abnormally during operation, resulting in extremely low fatigue strength and cracking. This resulted in encouraging the

In order to prevent abnormal heating of the inter-electrode connecting member 6 in the above, it is conceivable to increase the thickness dimension of the inter-electrode connecting member 6 in order to lower the current density of the energizing current, but the dimensions at the rotor are Since this is determined by the thickness of the N-pole winding end 4a and the S-pole winding end 5a, increasing the thickness is restricted and difficult to achieve.
Furthermore, as shown in Fig. 2, it is possible to reduce the current density by increasing the width dimension W of the inter-electrode connecting member 6, but the larger the width dimension W, the more difficult it is to start and stop the rotor. Various types of stress, such as excessive stress and centrifugal force, will be applied, resulting in a decrease in fatigue strength properties and making it impossible to prevent cracking.

If the shape of the interelectrode connecting member is changed in order to reduce the current density, the shape will become complicated, making it difficult to form a hollow part for water cooling, and even if formed, the flow path will become complicated, resulting in poor cooling performance. was bad.

[Object of the invention] The present invention was made based on the above circumstances, and
The purpose is to provide a water-cooled rotor having water-cooled rotor windings that do not generate cracks due to repeated fatigue, have excellent water-cooling performance, and are connected between poles for a long life. It is in.

[Summary of the invention]

The water-cooled rotor according to the present invention is made of hollow copper strips and is connected when connecting pole-to-pole portions in water-cooled rotor windings using hollow copper strips through which cooling water can flow. The above object is achieved by connecting the hollow parts of the desired parts so as to communicate with each other.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a perspective view for explaining one embodiment of a water-cooled rotor according to the present invention, and the same parts as in FIG. 2 are given the same reference numerals. In FIG. 3, reference numeral 7 denotes an inter-electrode connecting member in this embodiment, which is formed by bending a conductor such as copper into a substantially Y-shape and forming a hollow in each longitudinal direction. 8a is the N-pole winding end portion at the end of the N-pole winding 8. 9a is the S-pole winding end at the end of the S-pole winding 9. 9b is the middle part of the S-pole winding at the end of the S-pole winding 9.

The three ends of the inter-electrode connecting member 7 are connected to each end of the N-pole winding end 8a, the S-pole winding end 9a, and the S-pole winding intermediate part 9b by TIG welding, silver brazing, etc. be done. In this case, when connecting each end, each hollow part is connected so as to communicate with each other, and the pole-to-pole connection of the water-cooled rotor winding is performed.

In the above, from the branching part R of the inter-electrode connecting member 7
The length of the piece extending in the direction is such that it will not be affected by annealing during connection processes such as welding.

Further, in manufacturing the inter-electrode connecting member 7, for example, a thick copper plate is cut into a substantially Y-shape, and then a hollow hole is formed by machining.

Note that FIG. 4 incorporates the inter-electrode connection section consisting of the N-pole winding end portion 8a, the S-pole winding end portion 9a, the S-pole winding intermediate portion, and the inter-electrode connection member 7 shown in FIG. FIG. 3 is a perspective view showing a water-cooled rotor winding. In FIG. 4, the same parts as in FIGS. 1 and 3 are given the same reference numerals. That is, as shown in FIG. 4, it is a water-cooled rotor in which an N-pole water-cooled rotor winding 8 and an S-pole water-cooled rotor winding 7 are wound around a cylindrical rotor core. Then, one of the windings and the other winding are connected at their end portions on the side of the holding ring using an inter-electrode connecting member 7 formed of a hollow conductor formed into a substantially Y-shape. Therefore, the two ends of the pole-to-pole connecting member 7 are welded using a welding method such as TIG welding or silver welding to maintain the rigidity, and are then welded to the S-pole water-cooled rotor winding 7, which is the one winding. (connection ends 9a, 9b),
The remaining end of the inter-electrode connecting member 7 is welded with rigidity such as TIG welding or silver welding to the end of the N-pole water-cooled rotor winding 8, which is the other winding. The inter-electrode connecting member 7 and the hollow portions of the one winding and the other winding are connected to each other.

Next, the operation of this embodiment will be explained with reference to FIGS. 3 and 4. That is, as the rotor starts and stops, repeated stress acts on the N-pole and S-pole windings 4, 5 and the inter-pole connecting member 7. In this case, in this embodiment, the inter-electrode connecting member 7 is connected by TIG welding, silver brazing, etc., so that rigidity is maintained extremely effectively. Furthermore, since the connecting portion is located at a portion where repeated stress does not apply, that is, at a portion in the axial direction of the rotor, deformation of the inter-electrode connecting member 7 due to starting and stopping can be prevented.

In addition, the N-pole and S-pole windings 4 and 5 and the inter-pole connecting member 7
Since the hollow parts are connected and communicated, the circulation of cooling water is good, and therefore the heat generated during operation is effectively cooled down, which makes it possible to suppress the occurrence of the cracks mentioned above. becomes.

Furthermore, since the inter-electrode connecting member 7 is manufactured by a method that does not involve heating processing such as cutting or machining, the branching portion R where stress is concentrated does not undergo thermal deterioration (deterioration due to annealing). So,
There is no decrease in strength and the lifespan is extended. Furthermore, since the shape of the branch portion R can be arbitrarily changed during manufacturing, it is possible to significantly alleviate stress concentration.

Note that the present invention is not limited to the above embodiments. For example, as shown in FIG.
The N-pole winding end portion 5a extends in the axial direction of the rotor, and this extended portion is used as an inter-pole connecting member, and the hollow portions to be connected to each longitudinal portion of the S-pole winding 4 are They are connected by TIG welding or silver brazing so that they communicate.

With the above configuration, the connecting portions are formed in the longitudinal direction of the rotor where no repetitive stress is applied, so no repetitive stress due to operation is applied, and therefore deformation is extremely reduced.

Further, since the hollow portions are formed so as to communicate with each other at the portions to be connected, the circulation of cooling water is good, and the cooling performance is extremely good.

In addition to the above embodiments, the present invention can be implemented with various modifications without changing the gist thereof.

〔Effect of the invention〕

As described above, according to the present invention, when connecting the pole-to-pole portions of water-cooled rotor windings using hollow copper bands through which cooling water can flow, The water-cooled rotor winding has a connection between the poles that connects the hollow parts of the required parts so that they communicate, so no cracks occur due to repeated stress, and the water-cooled rotor winding has excellent water-cooling performance and an extremely long life. A water-cooled rotor can be provided.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing the end of a conventional water-cooled rotor, FIG. 2 is a perspective view showing the winding end of the rotor, and FIGS. 3 and 4 are water-cooled rotors according to the present invention. FIG. 5 is a perspective view for explaining one embodiment of the rotor, and FIG. 5 is a perspective view for explaining another embodiment. 2... Insulating cylinder, 3... Holding ring, 7, 10... Inter-electrode connection member, 8... N-pole winding, 9... S-pole winding.

Claims (1)

[Claims] 1. In a water-cooled rotor in which an N-pole water-cooled rotor winding and an S-pole water-cooled rotor winding are wound around a cylindrical rotor core, one of the windings and the other winding At the end of the retaining ring side, an inter-electrode connection is made using an inter-electrode connecting member formed by forming a hollow conductor into a substantially Y-shape, and the two ends of the inter-electrode connecting member are is inserted into the one winding and connected in a state where rigidity is maintained, and the remaining end of the inter-electrode connecting member is connected to the end of the other winding. A water-cooled rotor characterized in that the inter-electrode connecting member and the hollow portions of the one winding and the other winding are connected to each other while maintaining rigidity, and the hollow portions of the one winding and the other winding are in communication with each other.