JPH09182377A - Device for measuring amount of sealing oil of rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly locate an abnormal point and execute troubleshooting by providing a flowmeter between an exhaust oil pipe and an expanding tank. SOLUTION: A lubricating oil supplied to a shaft sealing means 4 and flowing into the inside of machine is collected with an exhaust oil pipe 7 and the amount of sealing oil inside each bearing is measured and stored via an expanding tank 10 having a flowmeter 16. Operation of a manual valve 12 is not required as explained above and the amount of sealing oil inside each bearing can be measured. Moreover, since the same effect can also be obtained even when the flowmeter is provided at the output port of the expanding tank 10, even if the amount of sealing oil or the inside is abnormal, the abnormal point may be located quickly because a defective shaft sealing means of bearing can be verified. Moreover, since the amount of internal sealing oil of reach bearing can be measured at the periodical check period, it can be checked that the shaft sealing apparatus can be assembled adequately. If an abnormality occurs, recovery can be made quickly. Moreover, operation of manual valve is unnecessary, there is no fear of forgetting to open the manual valve after the measurement of the amount of sealing oil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing oil amount detecting device in a hydrogen-cooled rotating electric machine.

[0002]

2. Description of the Related Art Some rotating electric machines, such as turbine generators, use hydrogen gas as a cooling medium. In this case, a shaft seal is installed inside the machine inside the bearing device that supports the rotating shaft to prevent hydrogen gas from leaking out of the machine due to the lubricating oil supplied to the shaft seal. It is circulated by an oil pump through the device. Since the lubricating oil that flows out from the shaft seal to the inside of the machine contains hydrogen bubbles, it is collected in an expansion tank to separate the hydrogen bubbles from the oil and the outside of the machine via a float trap tank that prevents the gas inside the machine from flowing out to the oil system. Leading to. In general, when the generator is stopped by periodic inspection and restarted, one method of knowing the operating condition of the generator is to measure the amount of oil returned inside. A conventional measuring method will be described with reference to FIG. In FIG. 3, 1 is an outer shell of the turbine generator, 2 is a bearing box portion provided at both ends of the generator outer shell 1, 3 is a rotary shaft, 4 is a shaft seal portion, 5 is an oil drainer, 6 is an outer shell 1 An expansion tank provided in the lower part, which is a shaft seal portion 4
A portion of the lubricating oil that has been supplied to the inside of the machine is collected and stored in an oil discharge pipe 7 to form an oil reservoir for eliminating hydrogen bubbles contained in the oil. A float trap tank 8 communicates with the expansion tank 6 by an oil guide tube 9 and is provided with a liquid level gauge 11 for measuring the oil amount. Further, a valve is provided which communicates with the float so that the gas inside the machine does not flow out to the oil discharge pipe 13 which communicates with the outside of the machine due to the decrease of the oil level. Reference numeral 12 is a manual valve provided in the middle of the oil drain pipe 13.

When measuring the amount of oil returned to the inside, the manual valve 12 provided at the outlet of the float trap tank 8 is closed, and the rise of the oil level of the float trap tank 8 per unit time is measured by the liquid level gauge 11. Immediately after measuring the amount of return oil inside, the manual valve 12 on the outlet side of the float trap tank 8 is opened. Since the measurement is performed in this way, the TO on the turbine side and the collector side
Only the amount of TAL inner seal oil could be measured.

[0004]

Since the conventional measurement of the inner return oil amount of the rotary electric machine is configured as described above, only the TOTAL inner return oil amount of the bearings on both sides can be measured. When an abnormality occurred, it was impossible to determine which side of the shaft seal device was abnormal, and the bearings on both sides had to be disassembled and inspected, so it took time to investigate the cause.

The present invention has been made in view of the above circumstances, and it is possible to quickly determine the cause because it is possible to determine which of the bearing seal devices is abnormal even if the amount of return oil in the inside is abnormal, and the manual valve is used. It is an object of the present invention to provide a sealed oil amount detection device for a rotating electric machine, which can measure the amount of inner seal oil without performing the above operation.

[0006]

A sealed oil amount detecting device for a rotary electric machine according to the present invention includes a bearing box portion which seals a cooling medium for circulating and cooling the inside of the rotary electric machine with bearing oil and forms a bearing of the rotary electric machine. This bearing box does not rotate at the end of the rotary shaft of the rotor of the rotating electric machine, and the shaft seal part seals the bearing oil that leaks from the surface of the rotary shaft toward the end, and the bearing box part does not rotate with the shaft seal part. An oil drainer that seals the bearing oil that leaks from the surface of the rotating shaft in the direction of the rotor between the child and the child, and is connected to the bearing box through an oil drain pipe to separate the cooling medium contained in the bearing oil. In a sealed oil amount detection device for a rotary electric machine comprising an expansion tank and a float trap tank for supplying bearing oil from the expansion tank via an oil pipe and a manual valve, a flow meter is provided between the oil discharge pipe and the expansion tank. It is characterized by being through. Further, it is characterized in that a liquid level gauge is used instead of the flow meter provided between the oil discharge pipe and the expansion tank.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A first embodiment of the present invention will be described with reference to FIG. In FIG. 1, 1-5, 7-9,
Up to 12, 13 is the same device as the conventional one, and 10 is an expansion tank with a flow meter 16 equipped with a flow meter 16. Outflow of lubricating oil supplied to the shaft seal portion 4 to the inside of the machine is collected by an oil discharge pipe 7, passes through an expansion tank 10 with a flow meter, and the inside seal oil amount of each bearing is measured and stored. As described above, the operation of the manual valve 112 is not required, and the inner seal oil amount of each bearing can be measured at a glance. Also, the same effect can be obtained by providing a flow meter on the outlet side of the expansion tank.

FIG. 2 shows a second embodiment of the present invention,
The difference from Fig. 1 is that when using an expansion tank with a liquid level gauge 14 equipped with a liquid level gauge 11 and measuring the inner seal oil amount of each bearing, the manual valve 215 is closed and the expansion tank with a liquid level gauge is used. Measure the rise of oil level per unit time with 14 level gauges.

[0009]

As described above, according to the present invention, the inner seal oil amount of each bearing can be measured, and even if the inner seal oil amount is abnormal, it can be confirmed which bearing has the abnormal shaft seal device. The cause investigation can be done quickly.

Further, according to the present invention, since the flowmeter is provided at the inlet side of the expansion tank of the rotating electric machine cooled by hydrogen gas, the inner seal oil amount of each bearing can be measured at the time of constant inspection start-up. You can check whether the shaft seal device is assembled in proper condition. If an abnormality occurs, it can be quickly restored. Further, since it is not necessary to operate the manual valve, there is no fear of neglecting to open the manual valve after measuring the inner seal oil amount.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a sealing oil amount detection device for a rotary electric machine according to an embodiment of the present invention.

FIG. 2 is a system diagram showing a sealing oil amount detection device for a rotary electric machine according to an embodiment of the present invention.

FIG. 3 is a system diagram showing a conventional sealed oil amount detection device for a rotary electric machine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Generator outer shell, 2 ... Bearing box part, 3 ... Rotating shaft, 4 ... Shaft seal part, 5 ... Oil drainer, 6 ... Expansion tank, 7 ... Oil drain pipe, 8 ... Float trap tank, 9 ... Oil guide pipe, 10 ... Expansion tank with flow meter,
11 ... Liquid level gauge, 12 ... Manual valve 1, 13 ... Discharge pipe, 14 ... Expansion tank with liquid level gauge, 15 ... Manual valve 2, 16 ... Flowmeter.

Claims (2)

[Claims] 1. A bearing box portion that seals a cooling medium for circulating and cooling the inside of a rotary electric machine with bearing oil and forms a bearing of the rotary electric machine, and a bearing shaft portion of the rotor of the rotary electric machine that forms the bearing box portion. A shaft seal portion that seals the bearing oil that leaks from the surface of the rotary shaft in the end direction at the end portion, and the bearing box portion is formed, and the rotary shaft is provided between the shaft seal portion and the rotor. An oil drainer that seals the bearing oil that leaks in the direction of the rotor from the surface, and an expansion tank that is connected to the bearing box portion via an oil drain pipe and separates the cooling medium contained in the bearing oil, In a sealed oil amount detection device for a rotating electric machine equipped with a float trap tank for supplying the bearing oil from the expansion tank via an oil guide pipe and a manual valve, a flow meter is interposed between the oil discharge pipe and the expansion tank. A rotary electric machine sealing oil amount detection device characterized in that . 2. The sealed oil amount detecting device for a rotary electric machine according to claim 1, wherein a level gauge is used instead of a flow meter provided between the oil discharge pipe and the expansion tank.