JP2943544B2 - Gas turbine generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine power generator, and more particularly, to a gas turbine power generator which generates electric power by driving a high frequency generator by a gas turbine engine.

[0002]

2. Description of the Related Art Conventionally, Japanese Utility Model Laid-Open Publication No. 2-46032 discloses a power transmission mechanism for transmitting the rotational force of a gas turbine engine to a generator at an increased or reduced speed via a planetary roller mechanism. This power transmission mechanism discloses that a planetary roller mechanism is provided with a common bearing for each shaft of a gas turbine engine and a generator and two other bearings.

[0003]

However, since the gas turbine power generator disclosed in Japanese Utility Model Laid-Open No. 2-46032 uses three bearings, it is necessary to supply lubricating oil to these bearings. There was a risk that horsepower loss would increase. Therefore, the present invention solves the problems of the conventional gas turbine power generation device, reduces the horsepower loss by minimizing the number of bearings, and achieves a gas turbine power generation device capable of reducing the size and weight required for device lubrication. The purpose is to provide.

[0004]

In order to achieve the above object, a gas turbine generator according to the present invention has a rotating shaft of a gas turbine engine and a rotating shaft of a high-frequency generator, and the high-frequency generator is rotated by the gas turbine engine. a gas turbine power generating apparatus for driving and power generation, by extending one end of the rotating shaft of the high-frequency generator, fitted with a compressor impeller and the turbine wheel of the gas turbine engine on a rotating shaft that is the extension in back to back, A gas turbine power generator supporting the rotating shaft by bearings provided at both ends of the generator is
The subject.

That is , the gas turbine constructed as described above
In the present invention, at least one of the bearings of the power generating device is a rolling bearing, an outer ring thereof is disposed on a concave retainer, and an elastic member is provided at one end of the outer ring, and oil is supplied from the retainer toward the other end. It is noted that
It is a sign.

[0006]

According to the gas turbine power generator of the present invention, the compressor impeller and the turbine wheel of the gas turbine engine are mounted on the rotating shaft extending one end of the rotating shaft of the high-frequency generator, and the two ends of the generator Since the rotating shaft is supported by the provided bearings, the number of bearings can be reduced to a minimum of two, and the horsepower loss can be minimized.
Further, at least one of the two bearings is a rolling bearing, a concave retainer is provided on the outer ring, an elastic member is provided at one end of the outer ring, and means for supplying oil from the retainer toward the other end is provided. Is provided,
One end of the outer ring is always elastically supported, and the other end is directly affected by oil pressure.

[0007]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a sectional view showing the configuration of an embodiment of the gas turbine power generator of the present invention. The gas turbine power generation device of this embodiment includes a gas turbine engine 10, a combustor 2
0, and the high-frequency generator 30.
To be communicated to.

The gas turbine engine 10 includes a high frequency generator 3
A turbine wheel 1 and a compressor impeller 2 are fastened to a shaft 3 of a rotor 31 of a No. 0 by a nut 4 and attached. On the outer periphery of the compressor impeller 2, a plurality of diffuser vanes 13 and diffuser vanes 13 arranged in a circumferential direction of a shroud 16 of the impeller 2 are provided.
Back plate 14 is provided. Further, an intake passage is formed by the shroud 16 and the intake 11 provided opposite thereto. A nozzle is provided on the outer periphery of the turbine wheel 1, and the nozzle is made of an integral heat-resistant alloy of a nozzle vane 25 and a plate 26 arranged in a large number in the circumferential direction of the shroud 24. A turbine scroll 27 for uniformly introducing a high-temperature and high-pressure gas to the nozzle is provided on the outer periphery of the nozzle, and is connected to the combustor 20. A plate insulator 15 that insulates heat from the turbine side is provided on the back plate 14 of the diffuser vane 13 on the back surface of the turbine wheel 1. Reference numeral 23 denotes an exhaust duct, which burns in the combustor 20 and discharges exhaust gas driving the turbine wheel 1.

The housing front 12, the housing main 28, and the housing burner 29 form a pressure vessel of the combustor 20.
1. An ignition plug 22 is provided. The oil pump that supplies oil to the gas turbine engine 10 and the fuel pump that supplies fuel to the fuel nozzle 21 are electric pumps, but are not shown in this figure.

The high frequency generator 30 includes a rotor 31, a stator frame 32, field winding frames 33 and 34, a cover plate 35, a winding 36, and an iron core 37, and also serves as a starter of the gas turbine engine 10. ing. The rotor 31 of the high-frequency generator 30 is extended to the gas turbine engine 10 side to be the rotating shaft 3, and is extended to the opposite side to be the supporting shaft 7. The rotor 31 is a high-frequency generator 30
Are rotatably supported by bearings 5 and 6 at shafts 3 and 7 located at both ends. 17 is the bearing 6
Is a spacer attached to the periphery of the shaft 3 of the gas turbine engine 10 adjacent to.

In the gas turbine power generator configured as described above, air at atmospheric pressure is guided to the intake passage formed by the intake 11 and the shroud 16, and becomes high-pressure air through the compressor impeller 2 and the diffuser vane 13. Housing front 12, housing main 28,
The fuel enters the pressure vessel formed by the housing burner 29 and assists the combustion of the fuel injected from the fuel nozzle 21 of the combustor 20 to become a high-temperature and high-pressure combustion gas. This high-temperature, high-pressure combustion gas is homogenized in the circumferential direction by the turbine scroll 27,
The homogenized combustion gas expands in the nozzle vanes 25 and the turbine wheel 1 and transmits a driving torque to the turbine wheel 1 to be exhausted and discharged from the exhaust duct 23.

FIG. 2 shows a configuration employed for at least one of the bearings 5 and 6 in FIG. 1, and shows, for example, the configuration of the bearing 5 in detail. Bearing 5 is ball 5
1, an inner ring 52 and an outer ring 53 are provided. The inner ring 52 is the rotating shaft 7
, And is integrally rotated by a nut 8. The outer ring 53 is held in the radial direction by the damper housing 80, and is held in the axial direction by an elastic ring 90, for example, a metal spring or the like, and a bearing retainer 70.

An oil pipe 71 is attached to the bearing retainer 70, and oil supplied from the oil pipe 71 passes through an oil passage 73 and oil supply holes 75 provided in the outer ring 53 in the circumferential direction of the outer ring 53. At 53, the oil pressure acts near the center of the outer ring 53. An oil passage 82 communicating with the oil passage 73 is provided in the damper housing 80, and the oil is supplied to the gap 54 formed by the seal ring 81 on the outer peripheral portion of the bearing outer ring 53. In addition, 72,8
3 is also a seal ring.

In the bearing 5 configured as described above, an oil film is formed between the bearing outer ring 53 and the retainer 70.
The elastic ring 90 prevents direct metal contact due to the thrust force applied to the rotating shaft 7 in the direction indicated by the arrow S due to the pressure difference acting on the front and rear surfaces of the compressor impeller 2 during operation of the gas turbine engine. The oil pipe 71
Is supplied by an oil pump driven to a gas turbine engine via a gear (not shown). That is, as the thrust force acting on the rotating shaft 7 increases, the oil pressure also increases. In addition, the bearing outer ring 53 is held by the oil pressure and the axial force of the elastic ring 90 regardless of the engine speed.

The single-row deep groove bearing shown in FIG. 2 generally has an axial gap a. Therefore, the bearing inner race 52 moves forward by a distance a with respect to the outer race 53 by the thrust force acting on the rotating shaft 7 during operation of the engine. That is, the rotating shaft 7 moves forward by the distance a. Then, as shown in FIG. 3 which is an enlarged view of a portion B in FIG. 1, the tip clearance Ct of the turbine wheel 1 integrated with the rotating shaft 7 also increases. If the tip clearance Ct increases, for example, as shown in FIG. 4, the turbine efficiency ηt decreases, causing a decrease in engine output and a decrease in fuel efficiency.

In this embodiment, since the bearing outer ring 53 is held by the oil pressure and the axial force of the elastic ring 90, the clearance of the turbine wheel 1 increases to Ct + a when the engine is stopped and when the engine is stopped. However, by pressing the bearing rear ring 53 and the thrust force backward by −a with oil pressure, the amount of change in clearance that greatly affects the engine performance can be reduced to zero.

Since the bearing outer ring 53 is always held by the oil pressure from the retainer 70 and the axial force by the elastic ring 90, the retainer 7 is kept irrespective of the rotation fluctuation of the engine.
0, No contact with the damper housing 80. In addition, the oil film and the elastic ring 9 are not affected by changes in the thrust force.
The vibration of the rotating shaft 7 can be suppressed by the damping effect of 0.

As described above, in the gas turbine power generator of the present invention, both ends of the rotor shaft of the generator are supported by the bearings, and the compressor impeller and the turbine wheel are mounted back to back on one of the shafts. And the main shaft bearing of the gas turbine engine can be used in common, and the size and weight of the device can be reduced. Further, in the gas turbine power generator of the present invention, the joint of the high-speed rotating shaft is unnecessary, and abnormal vibration due to the eccentricity of the joint does not occur. Further, there is no need to perform lubrication to prevent wear of the joint.

Since a gas turbine generator having a generator output of 5 kW or less has applications as a portable device, it is necessary to reduce the size and weight by setting the rotation speed to an extremely high speed, for example, 100,000 rpm. In such a case, the lubrication and cooling of the high-speed bearing require forced lubrication, and loss of horsepower occurs due to bearing friction and oil viscosity, which greatly affects generator performance. Then, the smaller the generator output, the greater the ratio of the loss horsepower to the output. Thus, by using two bearings as in the gas turbine power generator of the present invention, the horsepower loss can be minimized, and the size and weight can be reduced.

Further, at least one of the two bearings is a rolling bearing, a concave retainer is disposed on the outer ring, and an elastic member is provided at one end of the outer ring and oil is supplied from the retainer toward the other end. Thereby, the device required for lubrication can be minimized, and the size and weight of the device can be reduced.

[0021]

As described above, according to the present invention,
Since the main shaft of the gas turbine generator can be rotatably supported only by the bearing of the rotor shaft of the generator, the number of bearings can be reduced, and the horsepower loss can be minimized. Further, at least one of the two bearings is a rolling bearing, a concave retainer is disposed on the outer ring, an elastic member is provided at one end of the outer ring, and oil is supplied from the retainer toward the other end. Thus, even if the shaft moves in the axial direction, the both ends of the outer ring have a vibration damping effect by the direct action of the elastic member and the oil. Furthermore, compressor impeller,
Attaching the turbine wheels back-to-back has the effect of reducing the size and weight of the device.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of an embodiment of a gas turbine power generator of the present invention.

FIG. 2 is an enlarged sectional view showing a configuration example of a bearing of the gas turbine power generator of FIG.

FIG. 3 is a partially enlarged sectional view of a portion B in FIG. 1;

FIG. 4 is a diagram showing a relationship between a tip clearance Ct and a turbine efficiency ηt.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Turbine wheel 2 ... Compressor impeller 3 ... Rotor shaft 5, 6 ... Bearing 7 ... Shaft 10 ... Gas turbine engine 11 ... Intake 12 ... Housing front 13 ... Diffuser vane 14 ... Diffuser vane back plate 15 ... Plate insulator 16, DESCRIPTION OF SYMBOLS 24 ... Shroud 20 ... Combustor 21 ... Fuel nozzle 22 ... Spark plug 23 ... Exhaust duct 25 ... Nozzle vane 27 ... Turbine scroll 30 ... High frequency generator 31 ... Rotor 51 ... Ball 52 ... Bearing inner ring 53 ... Bearing outer ring 54 ... Gap 70 ... Bearing retainer 71 ... oil pipe 72,81,83 ... seal ring 73,82 ... oil passage 75 ... oil supply hole 80 ... damper housing 90 ... elastic ring

Claims (1)

(57) [Claims] [Claim 1] by combining the rotation axis of the rotary shaft and the high-frequency generator of the gas turbine engine, a gas turbine power generation instrumentation <br/> location for rotating drive to power the high-frequency generator by the gas turbine engine the extended end of the rotary shaft of the high-frequency generator, the rotating shaft by this extended compressor impeller and the turbine wheel of the gas turbine engine on a rotating shaft attached to the back to back, bearings provided at both ends of the generator In the gas turbine power generator supporting the above, at least one of the bearings is a rolling bearing, and
Of the outer ring in one end of the outer ring
Supply oil from the elastic member and the retainer to the other end
And a means for performing the operation.