JP2011223804A - Rotary device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently cool a bearing positioned on the side of connection of an exterior device while minimizing mechanical loss of a rotary device.SOLUTION: Cooling air is inhaled via a duct 5 into a housing 1 from a sub-inlet port 13a of the housing 1 present on the side on which a second bearing 62 is arranged, through rotation of a small blade 72 of a centrifugal fan 7. As shown in Figure 1, even when an engine 160 is positioned on a second edge side 1b of the housing 1, cooling air supplied from the duct 5 can cool the second bearing 62. In addition, the size of the small blade 72 is smaller than that of a large blade 71 so that the small blade 72 has a relatively small wind volume. This can avoid increasing the size of a dynamo 150 and minimize mechanical loss of the dynamo 150 compared with when an axial-flow fan or another centrifugal fan 7 is provided to cool the second bearing 62, for example.

Description

  The present invention relates to a rotating device such as a dynamo and a motor.

  As a technique for cooling a dynamo and a motor, for example, Patent Document 1 discloses a rotating electrical machine in which a cooling air passage for circulating a cooling airflow is provided in a stator core disposed on the outer peripheral side of a rotor. . A cooling fan is attached to one side of the rotating shaft of the rotating electrical machine, and the cooling fan is rotated by the rotation of the rotor, so that the outside air for cooling is taken in from one end of the casing of the rotating electrical machine. A part of the taken-in cooling air passes through the cooling air passage of the stator core and is discharged from the other end of the casing. As a result, the stator winding and the stator core are cooled (see, for example, paragraph [0016] of the specification of Patent Document 1).

  In this rotating electrical machine, the cooling fan attached to one side of the rotating shaft is a centrifugal fan, and outside air for cooling is taken into the casing from the opposite side of the rotating shaft to which the cooling fan is attached. The outside air for cooling is discharged out of the casing in the direction.

  By the way, when such a rotating device is actually used, an external device is connected to the rotating shaft of the rotating device. When the rotating device is a dynamo, the external device serves as a power source, and the power of the power source is transmitted to the dynamo rotating shaft, and the dynamo generates power. When the rotating device is a motor, the external device is a motor load device.

JP 2004-229390 A

  Of the two bearings of the rotating shaft of the rotating electrical machine described in Patent Document 1, the bearing disposed at a position far from the cooling fan (the bearing on the left side in FIG. 1 of Patent Document 1) is the cooling taken into the casing. It can be cooled by outside air. However, since the cooling fan is a centrifugal fan, the outside air for cooling is hardly supplied to the other bearing (the bearing on the right side in FIG. 1) provided on the side opposite to the side where the blades of the cooling fan are located. , Heading in the centrifugal direction as described above. Therefore, there is a problem that the bearing on the side close to the cooling fan cannot sufficiently dissipate heat.

  Here, when the external device is connected to the rotating electrical machine (rotating device) of Patent Document 1, it is generally connected to the end of the rotating shaft of the rotating device on the side where the cooling fan is attached. This is because the external device also generates heat, so when the external device is connected to the end of the rotating shaft opposite to the side where the cooling fan is attached, it is taken into the casing from the side opposite to the cooling fan. This is because the heat of the external device is transferred to the cooling gas. Therefore, the external device is connected to the end of the rotating shaft on the side close to the cooling fan. However, in such a configuration, it is more difficult to dissipate heat from the bearing near the cooling fan due to heat from the external device.

  Even if an axial fan is used instead of a centrifugal fan to dissipate heat from the bearing near the cooling fan, if the axial fan and the centrifugal fan are of the same size, the axial fan is a centrifugal fan. Since the air volume is small compared to, it is not practical. In order to obtain the same air volume as that of the centrifugal fan by the axial fan, it is necessary to increase the diameter of the axial fan and the size of the blades, which increases the mechanical loss of the rotating device.

  In view of the circumstances as described above, an object of the present invention is to provide a rotating device capable of sufficiently cooling a bearing provided on a side to which an external device is connected while minimizing mechanical loss of the rotating device as much as possible. Is to provide.

In order to achieve the above object, a rotating device according to an aspect of the present invention includes a housing, a first bearing, a second bearing, a rotor, a stator, a centrifugal fan, and a duct.
The housing includes a first end, a second end opposite to the first end, a first air inlet provided at a position near the first end, and the first 2 has a second intake port provided at the end portion, and an exhaust port provided at a position near the second end portion.
The first bearing is provided at the first end of the housing.
The second bearing is provided at the second end of the housing.
The rotor has a rotor shaft supported by the first bearing and the second bearing, and the rotor shaft is connected to an external device disposed outside the housing on the second end side of the housing. Connectable.
The stator is accommodated in the housing, and is disposed around the rotor between the first intake port and the exhaust port in the rotor axial direction.
The centrifugal fan has a first blade for sucking a cooling gas supplied from outside the housing into the housing through the first air inlet of the housing, and a second air inlet. And a second blade smaller than the first blade for sucking the cooling gas into the housing. Further, the centrifugal fan discharges the cooling gas sucked through the first and second air inlets out of the housing through the exhaust port.
The duct guides the cooling gas supplied from outside the housing to the second intake port.

  In the present invention, the first blades of the centrifugal fan are rotated by the rotation of the rotor, whereby the cooling gas sucked from the first intake port of the housing passes through the housing, and the first end portion and Is discharged from an exhaust port near the second end on the opposite side. Due to the cooling gas passing through the housing, the stator disposed between the first intake port and the exhaust port in the rotor axial direction, and the rotor disposed inside the stator (mainly part of the rotor shaft and the rotor The core part) is cooled. Further, the first bearing provided at the first end of the housing is cooled by the cooling gas sucked from the first air inlet.

  On the other hand, the second blade of the centrifugal fan is rotated by the rotation of the rotor, whereby the cooling gas is introduced into the housing from the second air inlet provided at the second end of the housing via the duct. Inhaled. That is, even if the external device is arranged on the second end side of the housing, the second bearing provided at the second end can be cooled by the cooling gas supplied from the duct. . At this time, since the cooling gas flows through the duct and is taken into the housing, the influence of heat on the cooling gas by the external device can be suppressed.

  Furthermore, in the present invention, the size of the second blade is smaller than that of the first blade. The cooling objects of the cooling gas that are circulated by the rotation of the first blade are mainly the rotor and the stator, and the cooling objects of the cooling gas that are circulated by the rotation of the second blade are the second bearings. Compared to both the rotor and stator and the second bearing, the second bearing has a smaller heat capacity. Therefore, the magnitude | size of a 2nd blade | wing can be made smaller than a 1st blade | wing, and the air volume by a 2nd blade | wing can be made comparatively small. Thereby, for example, in order to cool the second bearing, it is possible to prevent an increase in the size of the rotating device as compared with the case where an axial fan is provided or a separate centrifugal fan is provided. Loss can be minimized.

  The duct is opened toward the first end, and the cooling gas inlet and the internal flow path for guiding the cooling gas flowing in from the inlet to the second air inlet. You may have.

  Considering the heat generated by the external device, the temperature around the housing is lower on the first end side of the housing than on the second end side. Since the inlet of the duct is opened toward the first end, the cooling gas on the first end of the housing can easily flow into the internal flow path of the duct. That is, a cooling gas having a relatively low temperature can be sucked into the housing through the duct around the rotating device.

  As described above, according to the present invention, it is possible to sufficiently cool the bearing provided on the side to which the external device is connected while minimizing the mechanical loss of the rotating device.

FIG. 1 is a schematic cross-sectional view showing a power generation unit including a dynamo as a rotating device according to an embodiment of the present invention. FIG. 2 is a front view of the dynamo. FIG. 3 is a side view of the dynamo. 4 is a cross-sectional view taken along line AA in FIG. FIG. 5 is an enlarged view showing a part of the centrifugal fan viewed in the X-axis direction. FIG. 6 is a view of the centrifugal fan viewed from the side where the large blades are arranged.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Configuration of power generation unit]
FIG. 1 is a schematic cross-sectional view showing a power generation unit 100 including a dynamo 150 as a rotating device according to an embodiment of the present invention.

  The power generation unit 100 includes an engine 160 such as a gas turbine as an external device, a dynamo 150 connected to the engine 160, and a soundproof casing 101 that houses them. An air supply port 101a is provided on the side of the soundproof casing 101 where the dynamo 150 is disposed, and a discharge port 101b is provided on the side where the engine 160, which is the opposite side, is disposed. Cooling air, which is a gas outside the soundproof casing 101, is taken into the soundproof casing 101 through the air supply port 101a, and the air that has absorbed heat in the soundproof casing 101 is outside the soundproof casing 101 through the discharge port 101b. To be discharged. Note that an air supply duct and an exhaust duct (not shown) may be connected to the air supply port 101a and the exhaust port 101b, respectively.

  A radiator 162 and a radiator fan 161 for cooling the engine 160 are disposed on the exhaust port 101b side of the engine 160. The radiator 162 and the radiator fan 161 may be integrated with the engine 160.

  FIG. 2 is a front view showing the dynamo 150 as viewed in the rotor axial direction (Y-axis direction) of the dynamo 150. FIG. 3 is a side view of the dynamo 150, and FIG. 4 is a cross-sectional view taken along line AA in FIG.

  The dynamo 150 includes a housing 1. The housing 1 has a cylindrical main body 11 and covers 12 and 13 attached to both ends of the main body 11. As shown in FIG. 4, a rotor 4 having a rotor shaft 41 and a rotor core 42 is accommodated in the housing 1. Further, the housing 1 accommodates a stator 3 having a stator core 31 and a coil 32 disposed around the rotor 4 (the rotor core 42). The stator 3 is provided so as to be fixed to the inner wall surface of the housing 1.

  The engine 160 is connected to the rotor shaft 41 that extends from the housing 1 of the dynamo 150 from the second end 1b side, which is the left end in FIGS. Specifically, the output shaft 164 of the engine 160 is connected to the rotor shaft 41 of the dynamo 150 via a coupling 163.

  As shown in FIG. 4, the rotor shaft 41 includes a first bearing 61 provided on the cover 12 disposed on the first end 1 a opposite to the second end 1 b of the housing 1, It is rotatably supported by a second bearing 62 provided on the cover 13 disposed at the second end 1b.

  The housing 1 accommodates a centrifugal fan 7 that is disposed near the second end 1 b of the housing 1 and attached to the rotor shaft 41 of the rotor 4. The centrifugal fan 7 rotates integrally with the rotor shaft 41 by the rotation of the rotor shaft 41. Near the first end 1 a of the housing 1, the main intake port for taking in the cooling air taken in from the air supply port 101 a of the soundproof casing 101 into the housing 1 by the rotation of the centrifugal fan 7 as described above. 11a (first intake port) is provided. Further, an exhaust port 11 b is provided at a position near the second end portion 1 b of the housing 1 and corresponding to the outer peripheral portion of the centrifugal fan 7. Cooling air sucked from the main intake port 11a by the rotation of the centrifugal fan 7 is discharged out of the housing 1 through the exhaust port 11b. As shown in FIG. 3, a plurality of main intake ports 11 a and exhaust ports 11 b are provided in the circumferential direction of the rotor shaft 41 along the outer peripheral side surface of the housing 1.

  As shown in FIGS. 2 and 3, for example, two ducts 5 are attached to the lower part of the outer peripheral side surface of the housing 1. The cooling air extends in the longitudinal direction (Y-axis direction) of the housing 1. Yes. An inlet 51 for cooling air is provided at one end of the duct 5 on the first end 1a side, and the inlet 51 is opened toward the first end 1a. One end of the duct 5 provided with the inflow port 51 is provided so as to coincide with one end of the main body 11 of the housing 1 in the Y-axis direction. However, these arrangements do not have to match. For example, one end of the duct 5 may be located near the center of the main body 11 of the housing 1 or closer to the cover 13 than the center.

  The other end portion 53 of the duct 5 on the second end portion 1b side is installed along the surface of the cover 13 disposed on the second end portion 1b. The other end 53 of the duct 5 is provided so that the internal flow path 52 of the duct 5 communicates with the auxiliary air inlet 13a (second air inlet) provided in the lower part of the cover 13. For example, two auxiliary air inlets 13 a are provided for one duct 5.

  As shown in FIG. 3, a metal mesh 63 is installed at the main intake port 11 a and the exhaust port 11 b for safety and for protecting the inside of the housing 1. A wire mesh may also be provided at the sub exhaust port 11b.

  FIG. 5 is an enlarged view showing a part of the centrifugal fan 7 as viewed in the X-axis direction. The centrifugal fan 7 includes a circular base plate 73, a large blade 71 (first blade) provided on one side of the base plate 73 in the direction of the rotor shaft 41, and a large blade 71 of the base plate 73. A small blade 72 (second blade) provided on the side opposite to the side to be provided. FIG. 6 is a view of the centrifugal fan 7 as viewed from the side where the large blades 71 are disposed. The size of the small blade 72 is smaller than that of the large blade 71. The blade size referred to here is the blade size (length) in the direction of the rotor shaft 41 or the surface area of the blade, and the larger the size, the greater the air volume. In short, the size of the blade is the area of the main surface of the blade for generating a pressure difference between the vicinity of the inflow and the outflow of the airflow in the blade.

  As shown in FIG. 6, the radiation angle of the large blade 71 is, for example, 30 to 60 ° with respect to the radial direction, but is not limited to this range. In FIG. 6, the small blades 72 are not illustrated, but the small blades 72 are also installed at a radiation angle in the same direction as the large blades 71 when viewed from the side where the large blades 71 are arranged. Further, the number of small blades 72 and the length in the longitudinal direction thereof are substantially the same as those of the large blades 71.

  As shown in FIG. 5, in the Y-axis direction, the ratio of the length a of the large blades 71 and the length b of the small blades 72 is (3 to 6): 1. However, the ratio is not limited.

  In addition, each radiation | emission angle of a blade | wing may differ with the large blade | wing 71 and the small blade | wing 72, and the length of those longitudinal directions may also differ with the large blade | wing 71 and the small blade | wing 72. In FIG. 6, the shape of the large blade 71 viewed in the rotor axial direction is a linear shape, but is not limited thereto, and may be a curved shape.

[Operation of power generation unit 100]
The operation of the power generation unit 100 configured as described above will be described.

  The engine 160 and the radiator fan 161 are operated. By the operation of the engine 160, the power is transmitted to the dynamo 150 via the output shaft 164, and the rotor 4 and the centrifugal fan 7 of the dynamo 150 rotate. As a result, power generation is performed.

  When the radiator fan 161 and the centrifugal fan 7 are rotated, cooling air is supplied into the soundproof casing 101 through the air supply port 101 a of the soundproof casing 101. The cooling air supplied into the soundproof casing 101 by the rotation of the centrifugal fan 7 passes through the main air intake port 11a of the housing 1 of the dynamo 150 and the housing through the duct 5 and the sub air intake port 13a of the housing 1. Inhaled into 1. The cooling air is discharged out of the housing 1 through the exhaust port 11 b of the housing 1.

  Specifically, the cover 12, the first bearing 61, the rotor shaft 41, and the rotor core 42 are cooled by the cooling air sucked into the housing 1 through the main air inlet 11 a by the rotation of the large blade 71 of the centrifugal fan 7. The members such as the stator core 31 and the coil 32 are cooled. The rotor core 42 and the stator core 31 are provided with a plurality of cooling air passages (not shown) extending in the radial direction, for example, and the cooling air passes through the passages so that the rotor core 42 and the stator core 31 are To be cooled.

  Further, due to the rotation of the small blades 72 of the centrifugal fan 7, each member such as the second bearing 62 and the cover 13 is cooled by the cooling air sucked into the housing 1 through the duct 5 and the auxiliary air inlet 13 a. The

  The cooling air discharged to the outside of the housing 1 of the dynamo 150 flows around the engine 160 by the rotation of the radiator fan 161, thereby cooling the engine 160. Then, the cooling air passes through the radiator 162 and is discharged out of the soundproof casing 101 through the discharge port 101 b of the soundproof casing 101. In addition, a part of the cooling air supplied from the air supply port 101 a of the soundproof casing 101 does not pass through the dynamo 150, and directly goes to the periphery of the engine 160 by the rotation of the radiator fan 161, thereby cooling the engine 160.

  As described above, in the present embodiment, when the small blade 72 of the centrifugal fan 7 rotates, the sub-intake port 13a of the housing 1 on the side where the second bearing 62 is disposed via the duct 5. Cooling air is sucked into the housing 1. That is, even when the engine 160 is disposed on the second end 1b side of the housing 1 as shown in FIG. 1, the cooling air supplied from the duct 5 causes the second of the housing 1 to be The second bearing 62 provided at the end 1b can be cooled. At this time, since the cooling air flows through the duct 5 and is taken into the housing 1, the influence of heat on the cooling air by the engine 160 can be suppressed.

  Furthermore, in this embodiment, the size of the small blades 72 is smaller than the size of the large blades 71. The cooling target of the cooling air that is circulated by the rotation of the large blades 71 is mainly the rotor 4 and the stator 3 disposed between the main intake port 11a and the exhaust port 11b in the rotor axial direction. On the other hand, the cooling target of the cooling air that is circulated by the rotation of the small blades 72 is mainly the second bearing 62. Compared with both the rotor 4 and the stator 3 and the second bearing 62, the second bearing 62 has a smaller heat capacity. Therefore, the size of the small blades 72 can be made smaller than that of the large blades 71, and the air volume by the small blades 72 can be made relatively small. Thereby, for example, in order to cool the second bearing 62, it is possible to prevent the dynamo 150 from becoming larger than when an axial fan or a separate centrifugal fan 7 is provided. The mechanical loss can be made as small as possible.

  As described above, in the dynamo according to the present embodiment, it is possible to sufficiently cool the second bearing 62 while minimizing the mechanical loss of the dynamo 150 as much as possible.

  In consideration of the heat generated by the engine 160, the temperature around the housing 1 is lower on the first end 1a side of the housing 1 than on the second end 1b side. In this embodiment, since the inflow port 51 which is one end part of the duct 5 is opened toward the first end part 1 a side, the cooling air on the first end part 1 a side flows into the duct 5. It becomes easy to do. That is, cooling air having a relatively low temperature can be sucked into the housing 1 through the duct 5 around the dynamo 150.

  Further, since the duct 5 according to the present embodiment is disposed on the lower side of the housing 1 of the dynamo 150, the temperature of the cooling air can be kept lower than when the duct 5 is disposed on the upper side. it can.

  In this embodiment, since the cooling air flows in the radial direction between the centrifugal fan 7 and the cover 13 by the rotation of the small blades 72, the cover 13 is also sufficiently cooled. Thereby, it is possible to suppress the heat generated by the engine 160 from being transmitted into the housing 1 through the cover 13.

[Other embodiments]
The embodiment according to the present invention is not limited to the embodiment described above, and other various embodiments are realized.

  The shapes of the main intake port 11a, the auxiliary intake port 13a, and the exhaust port 11b of the dynamo 150 can be changed as appropriate. Further, the arrangement and number of the auxiliary air inlets 13a of the duct 5 can be changed as appropriate. In the said embodiment, although the duct 5 and the sub intake port 13a were arrange | positioned at the lower part side of the housing 1, you may arrange | position at the center or upper part side in the height direction. For example, a plurality of auxiliary air inlets may be provided circumferentially so as to surround the rotor shaft 41 shown in FIG. 2, and an annular duct that connects the plurality of auxiliary air inlets to each other may be attached to the cover 13. Good.

  The auxiliary air inlet 13a does not necessarily have to be opened toward the first end 1a side of the housing 1 of the dynamo 150, and may be opened upward or downward (or including an oblique direction). .

As the centrifugal fan 7 according to the above-described embodiment, a configuration in which the large blades 71 and the small blades 72 are provided on one base plate 73 is taken as an example. However, a configuration in which the large blade and the small blade are provided on separate base plates may be employed. That is, the centrifugal fan having the large blades and the centrifugal fan having the small blades may be configured separately, and each may be connected to the rotor shaft 41.
In this case, the centrifugal fan having large blades may be disposed near the first end 1a of the housing, for example, referring to FIG.

  In the above embodiment, the power generation unit 100 including the engine 160 as the external device and the dynamo as the rotating device is taken as an example. However, the present invention is also applicable to a system in which a rotating device is used as a motor (power source) and an external device connected to the motor is a motor load device.

  The cooling gas may be an inert gas or other gas other than air.

DESCRIPTION OF SYMBOLS 1 ... Housing 1a ... 1st edge part 1b ... 2nd edge part 3 ... Stator 4 ... Rotor 5 ... Duct 7 ... Centrifugal fan 11a ... Main inlet (equivalent to 1st inlet)
11b: Exhaust port 11b: Sub exhaust port (corresponding to second intake port)
DESCRIPTION OF SYMBOLS 41 ... Rotor shaft 51 ... Inlet 52 ... Internal flow path 61 ... 1st bearing 62 ... 2nd bearing 71 ... Large blade | wing (equivalent to 1st blade | wing)
72 ... small blade (corresponding to the second blade)
150 ... Dynamo 160 ... Engine (equivalent to an external device)

Claims (2)

A first end, a second end opposite to the first end, a first inlet provided at a position closer to the first end, and the second end A housing having a second air inlet provided in the air outlet and an air outlet provided near the second end,
A first bearing provided at the first end of the housing;
A second bearing provided at the second end of the housing;
The rotor shaft is supported by the first bearing and the second bearing, and the rotor shaft is connectable to an external device disposed outside the housing on the second end side of the housing. A rotor,
A stator housed in the housing and disposed around the rotor between the first air inlet and the air outlet in the rotor axial direction;
A first blade for sucking cooling gas supplied from outside the housing into the housing through the first air inlet of the housing, and inside the housing through the second air inlet. A second blade smaller than the first blade for sucking the cooling gas into the cooling gas, and the cooling gas sucked through the first and second intake ports A centrifugal fan that discharges outside the housing through an exhaust port;
A rotating device comprising: a duct for guiding the cooling gas supplied from outside the housing to the second air inlet. The rotating device according to claim 1,
The duct is
An inlet for the cooling gas, which is opened toward the first end side;
An internal flow path that guides the cooling gas flowing in from the inflow port to the second intake port.

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