JP4576309B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine such as a turbine generator in which a stator and a rotor are housed in a casing in which cooling gas is sealed, and a gas cooler is provided inside the casing.

For example, Patent Document 1 discloses a rotating electrical machine in which a stator and a rotor are accommodated in a casing in which cooling gas is sealed, and a gas cooler is provided in the casing.
As shown in FIG. 1 of Patent Document 1, the rotating electrical machine disclosed in Patent Document 1 includes a stator and a rotor disposed in a casing filled with cooling gas. A rotor having a plurality of cooling passages through which cooling gas passes in the outer peripheral direction at appropriate intervals in the axial direction is disposed, and a rotor supported rotatably through a gas gap is disposed on the inner peripheral side of the stator. A fan is provided on the end side, and is rotatably supported by a bearing at the shaft end. At the axial end of the stator and the axial end of the rotor, an inner windbreak plate that forms a gas space into which cooling gas flows is disposed, and an outer windbreak plate is disposed between the inner windbreak plate and the casing. The first ventilation path for guiding the cooling gas sent from the fan to the cooler and the fourth ventilation path for guiding the cooling gas for cooling the stator to the fan are formed, and the cooling gas discharged from the cooler is fixed to the stator. A configuration including second ventilation path forming means for guiding the radial cooling passage of the iron core and third ventilation path forming means for guiding cooling gas to the end of the stator core is shown. It arrange | positions at the cooling gas channel | path of an outer peripheral edge part.

In the rotating electric machine configured in this manner, the cooling gas given dynamic pressure by the fan blows out in the direction with the bearing bracket and the inner oil drain, passes through the first ventilation path, reaches the gas cooler, and the gas cooler The cooling gas cooled in step 1 flows into the intake section of the stator core and the section surrounded by the stator core end and the inner windbreak, and the cooling gas that flows into the intake section of the stator core The air passes through the ventilation duct of the intake section of the stator core, passes through the air guide, passes through the fourth ventilation path surrounded by the inner windbreak plate and the outer windbreak plate, and reaches the fan.
A part of the cooling gas that flows into the section surrounded by the end of the stator core and the inner windbreak plate flows into the rotor, cools the rotor, and joins the exhaust section of the stator core. After cooling the stator core, it is circulated so as to join the exhaust section of the stator core.

  In the conventional rotating electric machine configured as described above, the cooling gas that has cooled the central portion of the stator core and the end portion of the stator core passes through the fan, then passes through the gas cooler, and is cooled by the gas cooler. Since the gas is sent directly to the stator core side, heating due to fan loss is avoided as in the prior art. In addition, the section between the fan and the inner oil drain of the bearing has a positive pressure on the outflow side of the fan, so that the bearing chamber oil is not drawn into the machine as in the prior art.

Japanese Patent Laid-Open No. 06-261500

The rotating electric machine of Patent Document 1 configured as described above is configured such that the cooling gas that has passed through the gas cooler is sent directly to the stator core side, and heating due to fan loss is avoided. The section between the inner oil drainers has a positive pressure on the outflow side of the fan, and the oil in the bearing chamber is not drawn into the machine.
However, since the configuration of Patent Document 1 uses a cooling fan that sends cooling gas in the axial direction, a large space is required before and after the cooling fan in the axial direction, and the length of the rotation shaft becomes longer and the rotation becomes longer. There was a problem that the dimensions of the electric machine were large.

  SUMMARY OF THE INVENTION An object of the present invention is to reduce the length of a rotating shaft by reducing the length of the rotating shaft by using a cooling fan for circulating a cooling gas of the rotating electric device without requiring a space before and after the axial direction.

A rotating electrical machine according to the present invention includes a stator core and a stator coil that are disposed in a casing in which a cooling gas is sealed, and are provided with cooling gas passages through which the cooling gas passes in the outer circumferential direction at predetermined intervals in the axial direction. And a rotor core that is arranged on the inner peripheral side of the stator via a gap and is attached to the rotation shaft, is attached to the rotation shaft to form a rotor magnetic pole, and a rotor coil that excites the rotor core. A rotor whose both ends of the rotating shaft are rotatably supported by bearings , end gas space partitioning means for forming an end gas space at the end of the stator, and a position closer to the bearing than the end gas space partitioning means A centrifugal fan that is mounted on the rotary shaft, sucks cooling gas from the axial center side, and sends it out in the outer circumferential direction , and a gas wind tunnel that surrounds the centrifugal fan and is arranged on the bearing side from the end gas space partitioning means. Centrifugal blower consisting of Is disposed on the outer peripheral portion bearing side space partitioning means, the main gas cooler is passed through a cooling gas flowing sent to the end gas space by cooling, connected to the gas wind tunnel of the centrifugal blower, it is sent from the gas wind tunnel And a reversing wind tunnel for flowing the cooling gas into the main gas cooler .

  As described above, the cooling gas is circulated by the centrifugal blower, so that the space provided before and after the axial direction of the centrifugal blower is shortened, and the rotation axis is shorter than the case of using a conventional cooling fan that flows out in the axial direction. Therefore, it is possible to reduce the size of the rotating electrical machine.

Embodiment 1 FIG.
The configuration of the rotating electrical machine of the first embodiment is shown in FIG. FIG. 1 is a half cross-sectional view showing the upper part of the rotating electric machine from the center of the rotating shaft.
The rotating electrical machine includes a stator 10, a rotor 20 disposed on an inner diameter portion of the stator 10, a casing 25 that surrounds the outer periphery of the stator 10 and encloses cooling gas, and circulates the cooling gas in the casing 25. The centrifugal blower 30 is configured to include a cooling gas cooler 35 that cools the cooling gas.

The stator 10 has a configuration in which the stator core 11 is laminated in a state where cooling gas passages 11a are provided at predetermined intervals in the axial direction, and the stator coil 12 is inserted into a slot in the inner peripheral portion of the stator core 11. is there.
The rotor 20 is manufactured to have an outer diameter that can secure a gas gap D in the inner peripheral portion of the stator 10, and includes a rotor core 22 that forms a rotating shaft 21, a magnetic pole, and a rotor coil. Although not shown in the figure, a cooling gas passage is provided inside the rotor core portion 22 and is rotatably supported by bearings 23 at both ends.
An end gas space C is formed at both ends of the stator 10 by being surrounded by end gas space partitioning means 15.

  A centrifugal fan 31 mounted at a position on the bearing side of the end gas space partitioning means 15 at both ends of the rotating shaft 21 and surrounding the centrifugal fan 31 and disposed on the bearing side of the end gas space partitioning means 15 for cooling The centrifugal air blower 30 is constituted by the gas wind tunnel 32 through which the gas flows in the outer peripheral direction, and the rotor 20 rotates, whereby the centrifugal fan 31 rotates to apply dynamic pressure to the cooling gas.

The main gas cooler 35 for cooling the circulating cooling gas is disposed on the outer peripheral bearing 23 side of the end gas space partitioning means 15, and the cooling gas delivered from the gas wind tunnel 32 of the centrifugal blower 30 is the outer periphery of the stator 10. A reversing wind tunnel 36 is connected so as to flow into the main gas cooler 35 from the side.
The cooling gas is cooled by heat exchange by circulating a cooling medium such as cooling water through the main gas cooler 35.

The cooling gas sealed in the rotating electrical machine is sent from the axial center side to the outer circumferential direction by the centrifugal blower 30 as the rotor 20 rotates, and is inverted from the gas passage A in the gas wind tunnel in the reversing space B of the reversing wind tunnel 36. Are sent to the main gas cooler 35 and sent to the end gas space C to the cooling passage of the rotor 20 and the gas gap D between the inner diameter portion of the stator 10 and the outer diameter portion of the rotor 20. It flows in, passes through the cooling gas passage 11a of the stator 10 and is sent to the stator outer peripheral space E, is divided into both end sides in the stator outer peripheral space E, passes through the cooling gas return passage F, and passes through the cooling gas return passage F. It circulates in the circulation route returning to the side.

By configuring the rotating electrical machine in this way, the centrifugal blower 30 for circulating the cooling gas sucks the cooling gas from the axial center side and sends it out in the outer peripheral direction, flows into the main gas cooler 35 from the gas wind tunnel 32, and Since no space is required in the axial direction of the centrifugal blower 30, the axial length of the rotor 11 can be shortened.

Embodiment 2. FIG.
In the first embodiment, the main gas cooler 35 that cools the cooling gas is arranged on the outer periphery of the end gas space forming means 15 on the bearing 23 side. However, the second embodiment is the same as the first embodiment. An auxiliary cooler 42 is also provided on the outer periphery of the child 10.
A configuration diagram of the second embodiment is shown in FIG. FIG. 2 is a half cross-sectional view showing the upper part from the center of the rotating shaft of the rotating electrical machine in the same manner as FIG.

In FIG. 2, the stator 10 is laminated in a state in which the stator core 11 is provided with cooling gas passages 11 a at predetermined intervals, and the stator coil 12 is inserted into a slot provided in the inner peripheral portion of the stator core 11. It is the structure which was made. The rotor 20 is in outer diameter can be secured gas gap D in the inner periphery of the stator 10, a rotor core section 22 the rotor iron heart and the rotor coil is inserted to form the rotating shaft 21 and the pole And a cooling gas passage is provided inside the rotor core portion 22 and is rotatably supported by bearings 23 at both ends. A structure in which both end portions of the stator 10 are surrounded by the end gas space partitioning means 15 to form the end gas space C , and the centrifugally mounted at positions on the bearing 23 side of the end gas space partitioning means 15 at both ends of the rotating shaft 21. The centrifugal blower 30 is configured by the fan 31 and the gas wind tunnel 32 that surrounds the centrifugal fan 31 and is disposed on the bearing side of the end gas space partitioning means 15 , and is the same as in FIG. 1 of the first embodiment. .
This embodiment is different from FIG. 1 in that a cooling gas collecting cylinder 41 is provided on the outer peripheral portion of the stator 10 and an auxiliary gas cooler 42 is added to this portion.

When the auxiliary gas cooler 42 is added to the outer peripheral portion of the stator 10 in this manner, the cooling performance is improved, and the main gas cooler 35 and the auxiliary gas cooler 42 share the necessary cooling capacity, thereby allowing the main gas cooler to be shared. The dimension of 35 becomes small and it becomes possible to make the outer diameter of the casing 25 small. Therefore, the outer diameter of the casing 25 is reduced as compared with the first embodiment, and the dimensions of the rotating electrical machine can be further reduced.

Embodiment 3 FIG.
In the first embodiment and the second embodiment, the ventilation duct 32 of the centrifugal blower 30 that circulates the cooling gas is shown in one direction. However, the cooled cooling gas to the stator 10 and the rotor gas gap D is shown. If there is only one circulation path that flows in, the cooling gas flow rate to the cooling gas passage 11a of the stator 10 is uneven, and the cooling efficiency is not very good.

  In the third embodiment, the cooling gas sent from the centrifugal blower 30 is sent in at least two directions so that the amount of cooling gas flowing into the gas gap D between the stator 10 and the rotor 20 is made uniform. The gas wind tunnel is configured to flow into the gas gap between the stator 10 and the rotor 20 from a plurality of directions.

FIG. 3 shows a front view of the centrifugal blower in the case where the cooling gas is sent in, for example, three directions. The centrifugal blower 50 includes a centrifugal fan 51 mounted on the rotary shaft 21 and a cooling gas delivery wind tunnel 52 that surrounds the periphery of the centrifugal fan 51 and sends out a cooling gas in three directions. The end space partition shown in FIG. It comprises a gas wind tunnel 52 disposed on the bearing 23 side of the means 15, and each cooling gas delivery port of the cooling gas delivery wind tunnel 52 is connected to the main gas cooler 35.
The configuration of the rotating electrical machine is the same as the configuration of FIG. 1 of the first embodiment and FIG. 2 of the second embodiment.

When the centrifugal blower 50 that sends the cooling gas in a plurality of directions is used in this way, it flows into the gas gap D between the inner diameter of the stator 10 and the outer diameter of the rotor 20 of the rotating electrical machine from at least two directions. The cooling gas can be introduced from the gas gap D between the stator 10 and the rotor 20 into the cooling gas passage 11a of the stator 10 at a substantially uniform flow rate, so that the interior of the stator 10 is cooled substantially uniformly.
In the configuration of FIG. 3, the cooling gas delivery direction may be two or four directions.

FIG. 3 is a half cross-sectional view showing the configuration of the rotating electrical machine of the first embodiment. FIG. 6 is a half cross-sectional view showing a configuration of a rotating electrical machine of a second embodiment. It is a front view of the centrifugal blower which circulates cooling gas.

Explanation of symbols

10 Stator, 11 Stator core, 11a Cooling gas passage, 12 Stator coil,
15 end gas space partitioning means, 20 rotating shaft, 22 rotor core, 23 bearing,
25 Casing, 30 Centrifugal blower, 31 Centrifugal fan, 32 Gas wind tunnel,
35 main gas cooler, 36 reversing wind tunnel, 41 gas collecting cylinder, 42 auxiliary gas cooler,
50 Centrifugal blower, 51 Centrifugal fan, 52 Gas wind tunnel.

Claims (3)

A stator comprising a stator core and a stator coil provided in a casing in which cooling gas is sealed and provided with a cooling gas passage through which the cooling gas passes in the outer circumferential direction at predetermined intervals in the axial direction; The rotor is disposed on the inner peripheral side of the rotor via a gap, and includes a rotating shaft, a rotor core that is attached to the rotating shaft and forms a rotor magnetic pole, and a rotor coil that excites the rotor core. a rotor part is rotatably supported by a bearing, and the end gas space partitioning means for forming an end gas space above the stator end, above the position of the bearing side of the end gas space partition means A centrifugal fan that is mounted on the rotary shaft, sucks cooling gas from the axial center side, and sends it out in the outer circumferential direction , and a gas wind tunnel that surrounds the centrifugal fan and is arranged on the bearing side from the end gas space partitioning means A centrifugal blower comprising: Parts are disposed on the outer peripheral portion bearing side of the gas space partitioning means, passed through a cooling gas flowing cooled, the main gas cooler to be sent to the end gas space, connected to the gas wind tunnel of the centrifugal blower, the A rotating electrical machine comprising: a reversing wind tunnel for flowing cooling gas delivered from a gas wind tunnel into the main gas cooler . A stator outer peripheral gas wind tunnel surrounding the stator outer peripheral portion and forming an outer peripheral gas space in the stator outer peripheral portion is provided, and an auxiliary gas cooler is provided in the stator outer peripheral gas wind tunnel. 1. The rotating electrical machine according to 1. Gas Tunnel of the centrifugal blower, in the circumferential direction of the cooling gas the stator comprises a plurality of cooling gas delivery port for delivering at least two directions, via respective said inverting wind tunnel to the cooling gas outlet of said plurality of said connect the main gas cooler, claims 1, characterized in that the cooling gas delivered from the main cooling gas cooler are connected so as to flow from at least two directions in the end gas space The rotating electrical machine according to any one of 2 .

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