JP5960193B2 - Generator and generator - Google Patents

Description

  The present invention relates to a generator and a power generation apparatus having the generator.

  In the chamber where the gas turbine and the generator directly connected to the gas turbine are installed, a partition wall provided at an intermediate position in the axial direction of the generator, and a low temperature side space that is relatively low temperature during operation and Some are partitioned into a high temperature side space that is relatively high temperature during operation. A generator that needs to be maintained below a predetermined temperature is provided in the low temperature side space. A gas turbine is provided in the high temperature side space.

  The generator takes in air that has flowed into the low temperature side space from the outside, cools the inside, and discharges air whose temperature has increased by contributing to cooling. If the air to which the temperature has risen is the same low temperature side space, the temperature of the low temperature side space increases and the cooling effect is reduced. For this reason, it is set as the structure which makes the part on the opposite side to the air intake port of a generator, ie, the part by the side of a motor, protrude in a high temperature side space from a partition, and discharge | releases in a high temperature side space.

JP-A-11-350918

  In the configuration as described above, the temperature of the air introduced into the generator can be prevented from rising, but compared with the temperature of the anti-motor side bearing provided in the anti-motor side bracket, the motor side provided in the motor side bracket The temperature of the bearing will rise. For this reason, it was a problem to suppress the temperature rise of the prime mover side bearing.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to suppress a temperature rise of a prime mover side bearing which is a high temperature side in a generator.

In order to achieve the above-mentioned object, the present invention is driven by a mechanically coupled prime mover and is provided in a low temperature side space and a high temperature side space that are isolated from a high temperature side space in which the prime mover is provided. A generator provided across the rotor, the rotor having a rotor shaft rotatably supported around a horizontal rotation shaft, and a rotor core fixed to the rotor shaft, and the rotor core A stator having a stator core disposed radially outward and a stator winding wound around the stator core; and an axially outer side from the rotor core of the rotor shaft on the prime mover side A motor-side bearing that is disposed in a portion and protrudes into the high-temperature side space, supports the rotor shaft, and is disposed on the opposite side in the axial direction across the motor-side bearing and the rotor core; Rotor shaft An anti-motor side bearing to be supported; a frame that houses the rotor core and the stator, and has an intake portion for sucking air from the low temperature side space; and an exhaust portion for exhausting air to the high temperature side space; A prime mover side bracket and an anti prime mover side bracket that are fixedly supported by a frame and support the prime mover side bearing and the anti prime mover side bearing, respectively, and cooling gas flows from the intake portion and from the exhaust portion through the frame A fan that drives the cooling gas so as to flow out, and is provided in parallel with the stator on the radially outer side of the stator, and the cooling gas that has flowed in from the intake portion is placed in the vicinity of the prime mover side bearing. a supply pipe for transferring, taken on the prime mover side bracket so as to isolate the prime mover side bearing from the high temperature side space covering the hot side space side of the prime mover side bearing Comprising a bearing cover attached, and the prime mover side bracket is characterized by having an opening in a range covered by the bearing cover.

Further, the present invention is provided across the prime mover provided in the high temperature side space, the low temperature side space isolated from the high temperature side space, and the high temperature side space, and mechanically coupled to the prime mover. A generator comprising: a rotor shaft rotatably supported around a horizontal rotation axis; and a rotor core fixed to the rotor shaft. An axial direction from the rotor core of the rotor shaft, and a stator having a stator, a stator core disposed radially outside the rotor core, and a stator winding wound around the stator core A motor-side bearing that is disposed on the outer side of the motor side and has one side projecting into the high-temperature side space and supporting the rotor shaft, and opposite to the axial direction across the motor-side bearing and the rotor core Arranged on the side, said A frame having an anti-motor side bearing that supports the rotor shaft, an intake portion for storing the rotor core and the stator, and intake air from the low temperature side space and an exhaust portion for exhausting to the high temperature side space; A prime mover side bracket and an anti prime mover side bracket that are fixedly supported by the frame and support the prime mover side bearing and the anti prime mover side bearing, respectively, and cooling gas flows from the intake portion and passes through the frame to exhaust the exhaust. A fan that drives the cooling gas so as to flow out from the portion, and provided in parallel with the stator on the radially outer side of the stator, and the cooling gas that has flowed in from the intake portion of the motor-side bearing a supply pipe for transferring the vicinity, the prime mover said to cover the high-temperature side space side of the high temperature side from the space to isolate the prime mover side bearing the prime mover side bearing And a bearing cover attached to the racket, the prime mover side bracket is characterized by having an opening in a range covered by the bearing cover.

  ADVANTAGE OF THE INVENTION According to this invention, the temperature rise of the motor | power_engine side bearing used as the high temperature side in a generator can be suppressed.

1 is a longitudinal sectional view showing a configuration of a power generator according to a first embodiment in a longitudinal direction. FIG. 2 is a sectional view taken along the line II-II in FIG. 1 perpendicular to the axial direction showing the configuration of the generator according to the first embodiment. It is an expanded vertical sectional view which shows the structure of the oil bath bearing of the generator which concerns on 1st Embodiment. It is a vertical sectional view in the longitudinal direction showing the configuration of the generator according to the second embodiment. FIG. 5 is a vertical sectional view taken along line VV in FIG. 4 and perpendicular to the axial direction, showing the configuration of the generator according to the second embodiment.

  Hereinafter, with reference to drawings, the generator and power generator concerning an embodiment of the present invention are explained. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted.

[First Embodiment]
FIG. 1 is an elevational sectional view in the longitudinal direction showing the configuration of the power generator according to the first embodiment. FIG. 2 is a sectional view taken along the line II-II of FIG. 1 perpendicular to the axial direction showing the configuration of the generator.

  The power generation apparatus 200 includes a prime mover 1 and a generator 100 that are mechanically coupled to each other. That is, the rotor shaft 11 of the generator 100 is connected to the drive shaft 1b of the prime mover 1 by, for example, the flange 1a. In addition, you may connect via a reduction gear. Examples of the prime mover 1 include a gas turbine or a diesel engine.

  The room in which the prime mover 1 and the generator 100 are installed is divided into two spaces by a partition wall 4, a low temperature side space 2 and a high temperature side space 3 that is a higher temperature atmosphere than the low temperature side space 2. The prime mover 1 is installed in the high temperature side space 3. Further, most of the generator 100 is installed in the low temperature side space 2 which is lower in temperature than the high temperature side space 3. A part of the generator 100 described later is disposed in the high temperature side space 3, and the generator 100 is installed across the low temperature side space 2 and the high temperature side space 3.

  The generator 100 includes a rotor 10, a stator 30, a frame 40, a fan 18, an intake part 41, and an exhaust part 42.

  The rotor 10 includes a rotor shaft 11 provided horizontally, and a rotor core 12 disposed on the radially outer side of the central portion of the rotor shaft 11. A prime mover side bearing 20 is provided in the vicinity of both ends of the rotor shaft 11 with the rotor core 12 interposed therebetween, on the side close to the prime mover 1, and an anti prime mover side bearing 20 a on the opposite side of the prime mover side bearing 20 with the rotor core 12 interposed therebetween. Is provided. The rotor 10 is rotatably supported by a prime mover side bearing 20 and an anti-prime mover side bearing 20a.

  The rotor core 12 has a cylindrical steel plate shape, for example, a disk-shaped silicon plate having an opening at the center and a laminated steel plate laminated in the axial direction. The rotor core 12 is coupled to a rotor shaft 11 that passes through an opening at the center of the laminated steel sheet.

  The fan 18 is fixed to the rotor shaft 11 at a position between the rotor core 12 and the prime mover side bearing 20 in the axial direction, and rotates with the rotation of the rotor shaft 11. The fan 18 is, for example, a centrifugal fan, and is a double suction type in which air is sucked from both the rotor core 12 side and the prime mover side bearing 20 side as viewed from the fan 18. Note that even if it is a single suction type that sucks air from the rotor core 12 side as viewed from the fan 18, it may be a single suction type as long as a negative pressure can be secured on the motor side bearing 20 side of the fan 18.

  The stator 30 has a stator core 31 and a stator winding 32. The stator core 31 has a cylindrical shape having a central axis in the horizontal direction as a whole, and is provided in substantially the same range as the rotor core 12 in the rotation axis direction of the rotor shaft 11. The stator core 31 is provided on the outer side in the radial direction of the rotor core 12. The radially inner surface of the stator core 31 and the radially outer surface of the rotor core 12 face each other in the radial direction to form a gap.

  A plurality of slots extending in the direction of the rotation axis (not shown) are formed on the radially inner surface of the stator core 31. Thus, a plurality of projections (teeth) (not shown) extending in the rotation axis direction are formed so as to face the rotor core 12. A stator winding 32 is wound around the protruding portion.

  The rotor core 12 and the stator 30 are accommodated in the frame 40. The frame 40 has a rectangular parallelepiped box shape in which an intake portion 41 and an exhaust portion 42 are provided. An intake filter 41 a is provided at the inlet of the intake unit 41. The fan 18 drives the cooling air so that the cooling air sucked from the suction portion 41 mainly passes through the rotor core 12 and the stator 30 and is discharged from the exhaust portion 42. Air in the low temperature side space 2 is supplied to the intake portion 41. Further, the exhaust part 42 is discharged into the high temperature side space 3. For this reason, the part from the part in which the exhaust part 42 is provided to the prime mover side bearing 20 is in the high temperature side space 3.

  A plate-like partition plate 43 is provided on the intake portion 41 side of the stator core 31 in the frame 40. The partition plate 43 is joined to the inner surface of the frame 40 and is in close contact with the end portion of the stator core 31 on the intake portion 41 side. A circular opening 43 a concentric with the stator core 31 is formed in the partition plate 43. The diameter of the opening 43 a is smaller than the diameter of the outer surface of the stator core 31. Under the condition that the diameter of the opening 43 a is smaller than the diameter of the outer surface of the stator core 31, the air sucked from the intake section 41 extends from the opening 43 a to a region as close to the outer surface of the stator core 31 as possible. It is desirable to be as large as possible to pass. In addition, an inlet space 46 in which air flowing from the intake portion 41 into the frame 40 once accumulates is formed on the side of the intake portion 41 from the partition plate 43 in the frame 40.

  A prime mover side bracket 44 and a counter prime mover side bracket 45 are attached to the end of the frame 40 in the axial direction. The prime mover side bracket 44 fixedly supports the prime mover side bearing 20 from the outer side in the circumferential direction. The anti-motor side bracket 45 fixedly supports the anti-motor side bearing 20a from the outer side in the circumferential direction.

  Two air supply pipes 51 are arranged at the lower portion on the radially outer side of the stator core 31. Each of the two air supply pipes 51 extends in the axial direction, and one end passes through the partition plate 43 and opens to the intake portion 41 side. Further, each of the two air supply pipes 51 extends to the vicinity of the prime mover side bearing 20 and opens in the vicinity of the prime mover side bearing 20. Note that the pressure loss of the air flowing through the supply pipe 51 can be appropriately adjusted by the diameter of the supply pipe 51. Alternatively, the adjustment can be made by providing a throttle at the opening on the inlet side of the air supply pipe 51.

FIG. 3 is an enlarged vertical sectional view showing the configuration of the oil bath bearing of the generator. FIG. 3 shows the case of the prime mover side bearing 20, but the structure of the anti prime mover side bearing 20a is the same. The prime mover side bearing 20 includes a ball bearing 21, an inner oil container 25, an outer oil container 26, and a communication portion 24.

  The ball bearing 21 has a fixed portion 21a and a rotating portion 21b. The fixed portion 21 a is fixed to the outer periphery of the rotor shaft 11. The rotating portion 21 b is fixed to the prime mover side bracket 44 and supported by the prime mover side bracket 44.

  The inner oil container 25 is provided inside the ball bearing 21, that is, on the fan 18 side. The outer oil container 26 is provided outside the ball bearing 21, that is, on the opposite side of the inner oil container 25 in the axial direction across the ball bearing 21. Therefore, the outer oil container 26 protrudes into the high temperature side space 3, and the outer surface of the outer oil container 26 is in contact with the high temperature air in the high temperature side space 3.

  An inner oil reservoir 22 and an outer oil reservoir 23 are formed in each of the inner oil container 25 and the outer oil container 26. The inner oil reservoir 22 and the outer oil reservoir 23 are partitioned by a partition portion 27. A communication portion 24, which is a through hole connecting the inner oil reservoir 22 and the outer oil reservoir 23, is formed at a position below the oil level of the inner oil reservoir 22 and the outer oil reservoir 23 of the partition portion 27. .

  Next, the operation of the power generation apparatus 200 and the power generator 100 according to this embodiment configured as described above will be described.

  In the operation state of the power generation apparatus 200, the rotor 10 of the generator 100 is driven by the prime mover 1 and rotates about the axis of the rotor shaft 11. As the rotor 10 rotates, the fan 18 attached to the rotor shaft 11 rotates around the axis. As the fan 18 rotates, air on both sides of the fan 18 in the axial direction is sucked into the fan 18 and discharged from the exhaust unit 42.

  Most of the air in the inlet space 46 flows into the rotor core 12 and the stator 30 side from the opening 43 a of the partition plate 43. The cooling air that has cooled the rotor core 12 and the stator 30 flows toward the fan 18.

  A part of the air in the inlet space 46 flows into the air supply pipe 51 from the opening of the air supply pipe 51 that penetrates the partition plate 43. The cooling air that has flowed into the air supply pipe 51 flows out from the air supply pipe 51 to the vicinity of the prime mover side bearing 20. The cooling air that has flowed out in the vicinity of the prime mover side bearing 20 is blown to the outer surface of the inner oil container 25 to cool the inner oil container 25. As a result, the lubricating oil in the inner oil reservoir 22 is cooled. The cooled lubricating oil in the inner oil reservoir 22 and the lubricating oil in the outer oil reservoir 23 are exchanged with each other via the communication portion 24. As a result, the lubricating oil in the outer oil reservoir 23 in the outer oil container 26 is also cooled.

  Cooling air that is blown onto the outer surface of the inner oil container 25 and cools the lubricating oil in the inner oil reservoir 22 is sucked into the fan 18 and discharged into the high temperature side space 3 from the exhaust part 42.

  In the generator 100 of the power generator 200 configured as described above, the air on the low temperature side space 2 side that has flowed in from the intake portion 41 directly passes through the air supply pipe 51 to the inner oil sump 22 of the prime mover side bearing 20. The inner oil container 25 is sprayed on the outer surface. As a result, the temperature increase of the prime mover side bearing 20 on the high temperature side can be suppressed.

[Second Embodiment]
FIG. 4 is an elevational sectional view in the longitudinal direction showing the configuration of the generator according to the second embodiment. 5 is a vertical sectional view taken along the line VV of FIG. 4 perpendicular to the axial direction. This embodiment is a modification of the first embodiment.

  The generator 100 according to the second embodiment has a bearing cover 52. The bearing cover 52 is attached to the prime mover side bracket 44 so as to cover the high temperature side space 3 (FIG. 1) side of the prime mover side bearing 20. For this reason, the prime mover side bearing 20 is isolated from the high temperature side space 3 without directly contacting the air in the high temperature side space 3.

  Openings 44 a and 44 b are formed in a range covered by the bearing cover 52 of the prime mover side bracket 44. The other end of the air supply pipe 51 whose one end is on the partition plate 43 passes through the opening 44 a and is open in the space between the bearing cover 52 and the prime mover side bracket 44. Although not shown in FIG. 5, an opening for blowing cooling air in the vicinity of the inner oil container 25 may be further provided in the middle of the air supply pipe 51.

  5 shows the case where the air supply pipe 51 passes through the lower opening 44a, it may pass through the upper opening 44b.

  In the generator 100 according to the present embodiment configured as described above, the cooling air that has flowed out from the end of the air supply pipe 51 is placed on the outer surfaces of the inner oil container 25 and the outer oil container 26 of the prime mover side bearing 20. Sprayed to cool the inner oil container 25 and the outer oil container 26. As a result, the lubricating oil in the inner oil reservoir 22 and the outer oil reservoir 23 is cooled. Cooling air that is blown onto the outer surfaces of the inner oil reservoir 25 and the outer oil reservoir 26 and cools the lubricating oil in the inner oil reservoir 22 and the outer oil reservoir 23 is discharged into the high temperature side space 3 from the exhaust portion 42 by the fan 18. Is done.

  In the generator 100 of the power generator 200 configured as described above, it is possible to suppress the temperature rise of the prime mover side bearing 20 that is on the high temperature side.

[Other Embodiments]
As mentioned above, although embodiment of this invention was described, embodiment is shown as an example and is not intending limiting the range of invention. For example, in the embodiment, the arrangement of the air supply pipe 51 is shown in the case where the portion arranged in parallel with the stator 30 is below the stator 30, but is not limited thereto. For example, it may be upward. Or a side part may be sufficient and it may be distribute | arranged to upper direction, the downward direction, and a side part.

  Further, in the embodiment, the case where the mounting position of the fan is the axial position corresponding to the exhaust part 42 is shown, but the present invention is not limited to this. For example, you may attach to the part in the entrance space 46 of the rotor shaft 11. FIG. Alternatively, it may be provided at the outlet of the intake filter 41a, that is, the inlet of the inlet space 46. Moreover, although the fan 18 showed the case of the centrifugal fan in embodiment, another type may be sufficient as long as it has the same function. Furthermore, in the embodiment, the case where the cooling gas is air is shown, but the present invention is not limited to this and may be another gas.

  The embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention.

  The embodiments and the modifications thereof are included in the scope of the invention and the scope of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Prime mover, 1a ... Flange, 2 ... Low temperature side space, 3 ... High temperature side space, 4 ... Bulkhead, 10 ... Rotor, 11 ... Rotor shaft, 12 ... Rotor core, 18 ... Fan, 20 ... Motor side bearing, 20a ... anti-motor side bearing, 21 ... ball bearing, 21a ... fixed part, 21b ... rotating part, 22 ... inner oil sump, 23 ... outer oil sump, 24 ... communication part, 25 ... inner oil container, 26 ... outer oil container , 27 ... Partition part, 30 ... Stator, 31 ... Stator iron core, 32 ... Stator winding, 40 ... Frame, 41 ... Intake part, 41a ... Intake filter, 42 ... Exhaust part, 43 ... Partition plate, 43a ... Opening, 44 ... prime mover side bracket, 44a, 44b ... opening, 45 ... anti prime mover side bracket, 46 ... inlet space, 51 ... air supply pipe, 52 ... bearing cover, 100 ... generator, 200 ... power generator

Claims (3)

A generator driven by a mechanically coupled prime mover and provided across a low temperature side space and a high temperature side space isolated from a high temperature side space in which the prime mover is provided;
A rotor having a rotor shaft rotatably supported around a horizontal rotation axis, and a rotor core fixed to the rotor shaft;
A stator having a stator core disposed on the radially outer side of the rotor core and a stator winding wound around the stator core;
A prime mover side bearing that is disposed axially outside the rotor core of the rotor shaft and is disposed in a portion on the prime mover side, one side projects into the high temperature side space, and supports the rotor shaft;
An anti-motor-side bearing that is disposed on the opposite side in the axial direction across the motor-side bearing and the rotor core, and supports the rotor shaft;
A frame that houses the rotor core and the stator, and has an intake portion for sucking air from the low temperature side space and an exhaust portion for exhausting air to the high temperature side space;
A prime mover side bracket and an anti prime mover side bracket that are fixedly supported by the frame and support the prime mover side bearing and the anti prime mover side bearing, respectively;
A fan that drives the cooling gas so that the cooling gas flows in from the intake section and flows out of the exhaust section through the frame;
An air supply pipe that is provided in parallel to the stator on the radially outer side of the stator and transfers the cooling gas flowing in from the intake portion to the vicinity of the prime mover-side bearing;
A bearing cover attached to the prime mover side bracket so as to isolate the prime mover side bearing from the high temperature side space and cover the high temperature side space side of the prime mover side bearing;
Equipped with a,
The generator-side bracket has an opening in a range covered with the bearing cover . The prime mover side bearing and the anti prime mover side bearing are oil bath bearings each having an inner oil sump and an outer oil sump, and the air supply pipe passes the cooling gas to the vicinity of the outer surface of the oil sump portion of the prime mover side bearing. The generator according to claim 1, wherein the generator is arranged. A prime mover installed in the high temperature side space;
A generator mechanically coupled to the prime mover, provided across the low temperature side space isolated from the high temperature side space and the high temperature side space;
A power generation device comprising:
The generator is
A rotor having a rotor shaft rotatably supported around a horizontal rotation axis, and a rotor core fixed to the rotor shaft;
A stator having a stator core disposed on the radially outer side of the rotor core and a stator winding wound around the stator core;
A prime mover side bearing that is disposed axially outside the rotor core of the rotor shaft and is disposed in a portion on the prime mover side, one side projects into the high temperature side space, and supports the rotor shaft;
An anti-motor-side bearing that is disposed on the opposite side in the axial direction across the motor-side bearing and the rotor core, and supports the rotor shaft;
A frame that houses the rotor core and the stator, and has an intake portion for sucking air from the low temperature side space and an exhaust portion for exhausting air to the high temperature side space;
A prime mover side bracket and an anti prime mover side bracket that are fixedly supported by the frame and support the prime mover side bearing and the anti prime mover side bearing, respectively;
A fan that drives the cooling gas so that the cooling gas flows in from the intake section and flows out of the exhaust section through the frame;
An air supply pipe that is provided in parallel to the stator on the radially outer side of the stator and transfers the cooling gas flowing in from the intake portion to the vicinity of the prime mover-side bearing;
A bearing cover attached to the prime mover side bracket so as to isolate the prime mover side bearing from the high temperature side space and cover the high temperature side space side of the prime mover side bearing;
With
The power generator side bracket has an opening in a range covered with the bearing cover .

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