JP2006194290A - Failure detection device for oil lifter of rotary machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately detect failure of an oil lifter of a rotary machine. <P>SOLUTION: The failure detection device for the oil lifter lifts a thrust bearing rotary part 1 of a generator by pressurized oil supplied to a thrust bearing stationary part 2 by drive of a pump 10 via a check valve 5 provided in a hydraulic pressure line 4 at a time of start of the generator, detects an operation condition of the pump 10 by a pump operation condition detection part 25, and detects a gap between a valve body 5a and a valve element 5b of the check valve 5 by receiving light from a light projection part 21 provided on the valve body 5a by a light receive part 22 provided on the valve body 5a with a pressurized oil supply detection part 24. A check valve failure detection part 26 receives signal from a pump operation condition detection part 25 and the pressurized oil supply detection part 24, and failure of the check valve 5 is detected by not detecting the gap of the check valve during operation of the pump 1o or detecting a gap of the check valve 5 during stop of the pump 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a failure detection device for an oil lifter of a rotary machine.

  In Patent Document 1, a thrust bearing rotating plate attached to a rotating shaft of a rotary machine such as a hydroelectric generator and a thrust bearing stationary plate that contacts the rotating plate and supports the rotating shaft in the thrust direction are immersed in a bearing oil tank. A detecting device for detecting the pressure of a thrust bearing oil film formed between the rotating plate and the stationary plate is shown. In Patent Document 2, the rotating shaft of the vertical rotating electrical machine is supported by a rotating plate in the bearing oil tank that rotates integrally with the rotating shaft, and a stationary plate that faces the rotating plate through an oil film. There is shown an automatic monitoring device for a thrust bearing device that detects an abnormality of a thrust bearing by detecting a bearing oil film pressure, a bearing oil film thickness, a bearing oil temperature, and the like.

  On the other hand, there is an oil lifter that starts a thrust bearing rotating portion by lifting it with pressure oil when starting a rotary machine such as a hydroelectric generator. FIG. 2 shows a piping system diagram of an oil lifter of a generator, wherein 1 is a thrust bearing rotating part, 2 is a plurality of thrust bearing stationary parts that support the thrust bearing rotating part 1, and the stationary part 2 is connected via an orifice 3. The hydraulic lines 4 are connected to each other, and one end of the hydraulic line 7 is connected to each hydraulic line 4 via the first check valve 5, and these portions are immersed in the bearing oil tank 6. A valve 8, a second check valve 9, a pump 10 and a valve 11 are sequentially provided in the hydraulic line 7, and the other end of the hydraulic line 7 is connected to the bearing oil tank 6. A hydraulic line 12 is connected between the valve 8 of the hydraulic line 7 and the second check valve 9, and a valve 13 and a hydraulic gauge 14 are provided in the hydraulic line 12. One end of a hydraulic line 15 is also connected between the valve 8 of the hydraulic line 7 and the second check valve 9. The hydraulic line 15 is provided with a valve 16 and a pressure switch 17. The other end of the path 15 is connected to the bearing oil tank 6. One end of a hydraulic line 18 is connected between the second check valve 9 of the hydraulic line 7 and the pump 10, and a hydraulic control valve 19 and a valve 20 for controlling the hydraulic pressure are connected to the hydraulic line 18. The other end of the hydraulic line 18 is connected to the bearing oil tank 6.

  In the above configuration, when the pump 10 is driven at the time of starting the generator, the pressure oil is supplied from the hydraulic line 7, the second check valve 9, the valve 8, the first check valve 5, the hydraulic line 4, the orifice 3, and the like. The thrust bearing rotating part 1 is supplied to the thrust bearing rotating part 1 via the thrust bearing stationary part 2, and the thrust bearing rotating part 1 is lifted by the pressure oil and rotates smoothly. The first check valve 5 is provided to prevent the pressure oil that lifts the thrust bearing rotating portion 1 from flowing back from the bearing oil tank 6, and when the first check valve 5 breaks down, the generator is started. Sometimes the thrust bearing rotating part 1 cannot be lifted and the generator cannot be started. Therefore, failure detection of the first check valve 5 is important.

In the above-described generator oil lifter, when the first check valve 5 fails, the hydraulic pressure between the first and second check valves 5 and 9 in the hydraulic line 7 is increased, and the pressure switch 17 is activated. By continuing to do so, a failure of the first check valve 5 can be detected.
Japanese Patent Laid-Open No. 7-12117 Japanese Patent Application Laid-Open No. 61-157821

  In the oil lifter of the conventional rotary machine described above, the failure detection of the first check valve 5 is not directly detected by the presence or absence of the oil flow of the pressure oil, but between the check valves 5 and 9 of the hydraulic line 7. When the increase in hydraulic pressure occurs due to a cause other than the failure of the check valve 5, a failure of the check valve 5 is erroneously detected. In addition, there are a plurality of first check valves 5 and it has not been possible to detect which check valve 5 has failed.

  The present invention has been made to solve the above-described problems, and can accurately detect a failure of an oil lifter of a rotating machine and determine which first check valve has failed. An object of the present invention is to obtain a failure detection device for an oil lifter of a rotating machine that can be detected.

  According to a first aspect of the present invention, there is provided a failure detection device for an oil lifter of a rotating machine through a check valve in which a thrust bearing rotating portion of the rotating machine is provided in a hydraulic line by driving a pump when the rotating machine is started. In an oil lifter of a rotary machine that is lifted by pressurized oil supplied to a stationary part, an oil flow presence / absence detecting unit that detects whether or not an oil flow is generated in the hydraulic pipe, a valve body and a valve of a check valve A pressure oil supply detection unit that detects whether or not pressure oil is supplied to the thrust bearing rotating unit by optically detecting a gap with the body, and a signal from the oil flow presence / absence detection unit and the pressure oil supply detection unit And a check valve failure presence / absence determination unit that determines the presence or absence of a check valve failure.

  As described above, according to the first aspect of the present invention, it is detected whether or not an oil flow is generated in the hydraulic pipeline, and the gap between the valve body and the valve body of the check valve is optically detected. Is used to detect whether or not pressure oil is being supplied to the thrust bearing rotating part, and the presence or absence of a check valve failure is determined by receiving these detection signals. Since the presence / absence of the supply is directly detected, it is possible to accurately detect the check valve failure, and when there are a plurality of check valves, it is possible to detect which check valve has failed.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration diagram of a failure detection device for an oil lifter of a generator according to the best mode of the present invention. A first check valve 5 includes a valve body 5a provided in a hydraulic line 4, and a valve body 5a. The valve body 5b is provided with a light projecting portion 21 and a light receiving portion 22 of an optical sensor, and the light projecting portion 21 is molded with resin except for the light emitting portion. The The light receiving unit 22 is embedded in the valve body 5a. The signal lines 23 of the light projecting unit 21 and the light receiving unit 22 are drawn out through the inside of the valve body 5 a and connected to the pressure oil supply detection unit 24. Further, the pump operation state detection unit 25 detects whether the pump 10 is in an operation state or a stop state based on, for example, whether the motor of the pump 10 is in a drive state. A check valve failure detection unit 26 receives signals from the pressure oil supply detection unit 24 and the pump operation state detection unit 25 to detect whether the check valve 5 is in failure.

  In the above configuration, the pressure oil supply detection unit 24 determines whether or not there is a gap between the valve body 5a and the valve body 5b of the check valve 5 depending on whether or not the light from the light projecting unit 21 is received by the light receiving unit 22. To detect. That is, when light is received by the light receiving unit 22, there is a gap between the valve body 5a and the valve body 5b, and when no light is received, there is no gap. Moreover, the fact that there is a gap means that the pressure oil is supplied to the thrust bearing rotating part 1 via the check valve 5, and the fact that there is no gap means that no pressure oil is supplied. . The pump operation state detection unit 25 detects whether the pump 10 is in an operation state or a stop state. The check valve failure detection unit 26 receives signals from the pressure oil supply detection unit 24 and the pump operation state detection unit 25 and detects whether or not the check valve 5 has failed. Specifically, the results shown in Table 1 are obtained.

  That is, when the pump operation state detection unit 25 detects the operation state of the pump 10 and the pressure oil supply detection unit 24 detects a gap between the valve body 5a and the valve body 5b, that is, when supply of pressure oil is detected. The check valve failure detection unit 26 detects that the check valve 5 has no failure and is normal. The pump operation state detection unit 25 detects the stop state of the pump 10 and the pressure oil supply detection unit 24 When the gap between the valve body 5a and the valve body 5b is detected, the check valve failure detection unit 26 detects a failure of the check valve 5. In addition, the pump operation state detection unit 25 detects the operation state of the pump 10, and the pressure oil supply detection unit 24 detects that there is no gap between the valve body 5a and the valve body 5b, that is, supplies pressure oil. If not detected, the check valve failure detection unit 26 detects a failure of the check valve 5, the pump operation state detection unit 25 detects the stop state of the pump 10, and the pressure oil supply detection unit 24 detects the valve body. When the gap between the valve body 5b and the valve body 5b is not detected, the check valve failure detection unit 26 detects that the check valve 5 is normal and normal.

  In the above-described best embodiment, the gap between the valve body 5a and the valve body 5b of the check valve 5 is not detected when the pump 10 is operated, or the valve body 5a and the valve of the check valve 5 are stopped when the pump 10 is stopped. The failure of the check valve 5 is detected by detecting the clearance with the body 5b, and the presence or absence of supply of pressure oil to the thrust bearing rotating part 1 is directly detected by detecting the clearance of the check valve 5. The failure of the check valve 5 can be accurately detected. Further, the light projecting portion 21 is molded with resin except for the light emitting portion, and can be prevented from being damaged by the oil flow. Further, the check valve failure detection unit 26 is provided for each first check valve 5 and can detect which check valve 5 has failed.

  In the above-described best embodiment, the operating state of the pump 10 is detected. In short, it is only necessary to detect whether oil is flowing in the hydraulic lines 4 and 7. A flow meter may be provided to detect the oil flow.

It is a block diagram of the failure detection apparatus of the oil lifter of the generator by this Embodiment best mode. It is a piping system diagram of the oil lifter of the conventional generator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Thrust bearing rotary part 2 ... Thrust bearing stationary part 4, 7 ... Hydraulic pipe 5, 9 ... Check valve 5a ... Valve body 5b ... Valve body 6 ... Bearing oil tank 10 ... Pump 17 ... Pressure switch 21 ... Light emitting part DESCRIPTION OF SYMBOLS 22 ... Light-receiving part 24 ... Pressure oil supply detection part 25 ... Pump operation state detection part 26 ... Check valve failure detection part

Claims (1)

In the oil lifter of a rotating machine, the thrust bearing rotating part of the rotating machine is lifted by the pressure oil supplied to the thrust bearing stationary part via a check valve provided in the hydraulic line by driving the pump when the rotating machine is started. The oil flow presence / absence detecting unit for detecting whether or not an oil flow is generated in the hydraulic pipe line and the oil pressure detection in the thrust bearing rotating unit by optically detecting the gap between the valve body and the valve body of the check valve. Check whether there is a check valve failure by receiving a signal from the pressure oil supply detection unit that detects whether or not oil is being supplied, and signals from the oil flow presence / absence detection unit and the pressure oil supply detection unit An oil lifter failure detection device for a rotary machine, comprising:

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