JPS6130434Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a rotor of a gas-cooled rotating electrical machine such as a hydrogen gas-cooled generator that cools the rotor with hydrogen gas.

[Background of the idea]

In a rotating electric machine such as a hydrogen gas-cooled generator, there are the following restrictions on providing a gas flow path for cooling the end windings of the rotor. In other words, the retaining ring that holds the wire in a predetermined position is subjected to large stress, so it is not preferable to provide a flow path in the retaining ring, and the introduction and discharge of gas to the winding section is located outside the end face of the retaining ring. , and must be carried out through an annular surface constrained by the rotor axis.
Moreover, the area that can be taken as the gas flow introduction and discharge passage is such that the winding stack occupies a large part of the area between the retaining ring and the rotor shaft, and the winding stack is located under the retaining ring and moves the winding stack in the axial direction. Because of the presence of the central ring that holds the surface, the area is substantially more restricted than the area of the annular surface. For this reason, the gas inlet
The biggest challenge in rotor end winding cooling technology was how to widen the exhaust port under restricted conditions.

In the prior art, for example, grooves are provided in the rotor shaft to increase the area of the gas inlet that guides gas to the gas inlet chamber, and the gas discharge chamber near the polar axis is divided into a first region near the center ring and a second region far away. The first and second fan-shaped ventilation devices are connected to each other, and the third fan-shaped ventilation device is also connected to the third area of the gas discharge chamber near the horizontal axis. , the structure is such that gas is discharged to the outside.

In such prior art, the first and second fan-shaped ventilation devices are provided in a region of the discharge chamber circumferentially partitioned by a partition wall separating the inlet chamber and the discharge chamber in the vicinity of the polar axis; Similarly, the fan-shaped ventilation device in the above is installed only in the region of the discharge chamber that is partitioned by a partition wall that separates the inlet chamber and the discharge chamber in the circumferential direction near the horizontal axis, so the gas discharge area and discharge driving force are limited. It can't be that big.
Furthermore, unlike the first and second regions of the discharge chamber, the gas flowing into the third region includes both an axial flow path and a circumferential flow path within the winding. Since the air is discharged only through one fan-shaped ventilation device, a sufficient discharge area and discharge driving force cannot be obtained, and the end winding near the horizontal axis cannot be effectively cooled.

[Purpose of invention]

The rotor of the gas-cooled rotating electric machine of the present invention increases the gas discharge passage area, increases the discharge driving force in the fan-shaped ventilation device, increases the gas flow rate, and achieves effective and uniform cooling of the end windings. The purpose is to

[Characteristics of the invention]

The rotor of the gas-cooled rotating electrical machine of the present invention has two independent fan-shaped ventilation devices installed on the outside of the center ring end surface corresponding to the third region of the discharge chamber located near the horizontal axis, and these two fan-shaped ventilation devices The ventilation device and the third region of the discharge chamber are communicated through passages provided on the inner and outer circumference sides of the central ring, thereby increasing the gas discharge area and increasing the discharge driving force of the fan-shaped ventilation device. It is characterized by an increased gas flow rate.

[Example of idea]

A specific example of the rotor of the gas-cooled rotating electrical machine of the present invention will be described below with reference to FIGS. 1 to 4.

Figure 1 shows the structure of the discharge section at the horizontal axis position of the rotor end, and is composed of a rotor shaft 1, a retaining ring 2, a winding stack 3, and a central ring 4 fixed to the retaining ring 2. The discharge chamber 5 is attached to the center ring 4 and extends in the axial direction in the space below the winding stack 3.
The L-shaped insulating piece 6 and the circumferential insulating piece 7 are surrounded by the insulating piece 7 provided circumferentially between the plurality of winding laminates 3 counting from the center ring 4. The area is divided into a first area 5a in which the area is covered, and a second area 5b other than the area 5a. The first region 5a passes through a plurality of first axial passages 8 formed to axially penetrate the outer circumferential side of the center ring 4 fixed to the retaining ring 2, and passes through a first region 5a provided on the side surface of the center ring 4. It communicates with a fan-shaped ventilation device 9.

The second region 5b is a gap 10 between the L-shaped insulating piece 6 and the plurality of grooves 1a cut in the rotor shaft 1, and a second region 5b formed by penetrating the center ring 4 in the rotor shaft direction in the axial direction. It communicates with a second fan-shaped ventilation device 12 provided outside the first fan-shaped ventilation device 9 through an axial passage 11 . Therefore, the gas flow flows into the conductor of the winding stack 3 from the gas inlet (described later) and cools the winding stack 3, and then flows into the first region 5a and the second region of the discharge chamber 5. 5b. The gas discharged from the conductor of the winding stack 3 into the first region 5a of the discharge chamber 5 passes through the first axial passage 8.
The gas discharged through the first fan-shaped ventilation device 9 and into the second region 5b passes through the second axial passage 11 and is discharged around the rotor by the second fan-shaped ventilation device 12, respectively. .

FIG. 2 shows the structure of the gas introduction part and the gas discharge part near the horizontal axis position of the end of the rotor. The gas inlet chamber 13 is formed by a plurality of grooves 1b cut into the rotor shaft 1.
and a fifth axial passage 14 formed axially through the rotor shaft side of the center ring 4 to communicate with the gas inlet 15 . The plurality of grooves 1b are connected to the second region 5b of the discharge chamber and the second fan-shaped ventilation device 1.
"A partition wall 27 is provided between the winding stack 3 near the polar axis and the rotor shaft so as to be separated in the circumferential direction." The region 16 is attached in the circumferential direction to the winding laminate 3 extending in the axial direction near the horizontal axis 26, and its end portion extends in the axial direction to the center ring 4 so as to divide the circumference in the circumferential direction. It is surrounded by a partition wall 17 attached to the winding stack 3 extending in the direction, and an L-shaped insulating piece attached to the center ring 4 and extending in the axial direction in the space below the winding stack 3. The holding ring 2 side of the third region 16 of this discharge chamber is connected to the side surface of the center ring 4 through "a large number of third axial passages 19 formed to penetrate in the axial direction on the outer peripheral side of the center ring 4". It communicates with a third fan-shaped ventilation device 20 provided. Further, the rotor shaft 1 side of the third region 16 of the discharge chamber has a hole 21 provided in the L-shaped insulating piece 18,
Connected to the L-shaped insulating piece 18 and connected to the space under the center ring 4 and the fifth
an insulating piece 22 that radially isolates the axial passage of the
A fourth axial passage 23 formed in the axial direction by
, and communicates with a fourth fan-shaped ventilation device 24 located on the external side of the third fan-shaped ventilation device 20 .

FIG. 3 shows the arrangement of the winding rings from the polar axis 25 to the horizontal axis 26 at the end of the rotor in the present invention in a plan development view. 5b in the circumferential direction by a partition wall 27, and the discharge chamber 16 in the circumferential direction by the partition wall 17 and in the axial direction by an L-shaped insulating piece 18 and an insulating piece 22 in the radial direction. FIG. 4 is a perspective view of the rotor end shown in FIGS. 1-3.

In the rotor structure according to the present invention shown in Figs.
Enter the entrance chamber 13 divided by. Entrance room 13
The gas that enters the first and second regions 5 of the evacuation chamber
It is discharged to the a, 5b side or the third region 16 side of the discharge chamber. These first and second regions 5a, 5b
The gas discharged to the side flows into the inner winding circumferential flow path 28 of the winding stack 3 and cools the winding stack 3, and then flows into the first region 5a and the second region of the discharge chamber 5. It flows towards region 5b. "The remaining gas flows in from the gas inlet 15 near the horizontal axis, and the L-shaped insulating piece 1
8. A fifth section partitioned in the radial direction by an insulating piece 22
The gas flowing into the inlet chamber 13 through the axial passage 14 of
Alternatively, it flows through the winding inner axial flow path 29, cools the winding stack 3, and then flows toward the third region 16 of the discharge chamber located near the horizontal axis 26. Discharge chamber 5
The gas discharged into the first region 5a passes through the first axial passage 8 and is discharged from the first fan-shaped ventilation device 9 to the outside of the rotor. Further, the gas discharged into the second region 5b of the discharge chamber 5 passes through the groove 1a cut in the rotor shaft 1 and the second axial passage 11, and then from the second fan-shaped ventilation device 12 to the outside of the rotor. is released. In addition, a part of the gas discharged into the third region 16 of the discharge chamber passes through the third axial passage 19 and into the third region 16.
From the fan-shaped ventilation device 20, the rest are holes 21 provided in the L-shaped insulating piece 18 and a fourth axial passage 23.
The air is then discharged from the fourth fan-shaped ventilation device 24 to the outside of the rotor.

In the above embodiment, the fourth axial passage 23 is formed in the space between the center ring 4 and the insulating piece 22, but a large number of axial passages are provided on the rotor shaft side of the center ring 4. It is obvious that the same effect can be obtained even if the film is formed.

[Effect of idea]

As explained above, in the rotor of the gas-cooled rotating electric machine of the present invention, the gas discharge area of the discharge chamber can be increased, and the amount of cooling gas can be significantly increased. Additionally, the cooling of the end turns near the transverse axis can be significantly improved.

[Brief explanation of drawings]

Figures 1 to 4 are diagrams for explaining the rotor of the gas-cooled rotating electrical machine of the present invention. Figure 1 is a sectional view showing the structure at the polar axis position of the rotor end, and Figure 2 is a cross-sectional view of the rotor end. This shows the structure at the horizontal axis position of the part.
3 is a cross-sectional view taken along the line arrow 3 in FIG. 3, FIG. 3 is a developed plan view of the rotor end from near the polar axis position to near the horizontal axis position, and FIG. 4 is a perspective view of the rotor end. DESCRIPTION OF SYMBOLS 1... Rotor shaft, 2... Holding ring, 3... Winding laminate, 4... Center ring, 5a... First region of the discharge chamber, 5b... Second region of the discharge chamber, 16 ... third region of the discharge chamber, 8 ... first axial passage, 9 ...
...First fan-shaped ventilation device, 11...Second axial passage, 12...Second fan-shaped ventilation device, 13
... gas inlet chamber, 14 ... fifth axial passage,
15... Gas inlet, 17... Partition wall, 8... L-shaped insulating piece, 19... Third axial passage, 20... Third fan-shaped ventilation device, 23... Fourth axial passage , 24... fourth fan-shaped ventilation device, 25...
Polar axis, 26...horizontal axis.

Claims (1)

[Scope of utility model registration request] In the area between the retaining ring that holds the rotor winding and the rotor shaft, there is a center ring fixed to the retaining ring and a center ring with one end attached to the winding and the other end fixed to the rotor shaft. A gas inlet chamber and a discharge chamber are defined in the circumferential direction by a radial partition wall extending in the axial direction, and the gas flows into the winding ring from the inlet chamber, cools the winding, and then flows into the discharge chamber. In a rotor of a gas-cooled rotating electrical machine configured to discharge air to the outside of the rotor by means of a fan-shaped ventilation device provided on an external side surface of an end of the rotor, the discharge chamber has one end attached to the winding. A circumferential bulkhead whose other end extends in the radial direction, an L-shaped insulating piece attached to the radial bulkhead and the center ring and extending axially through the space under the windings to the circumferential bulkhead, The discharge chamber is divided into a first region located on the center ring side, a second region far from the center ring, and a third region located on the center ring side near the horizontal axis, and the discharge chamber is provided on the outer side of the center ring. a first fan-shaped ventilation device that communicates with a first region of the discharge chamber via a first axial passage provided on the outer circumferential side of the center ring; a second fan-shaped ventilation device located on an external side surface of the first fan-shaped ventilation device, which communicates through two axial passages, and a third region of the discharge chamber and an outer peripheral side and an inner peripheral side of the central ring. A third fan-shaped ventilation device communicating through a third axial passage and a fourth axial passage provided in The gas flow inlet chamber is circumferentially divided from the second axial passage, and passes through a fifth axial passage that is radially divided from the fourth axial passage to a gas inlet. A rotor for a gas-cooled rotating electric machine, characterized in that the rotor is configured to communicate with the rotor.