JP6851254B2 - Sealing oil control system for rotary electric machines - Google Patents

Description

The present invention relates to a sealing oil control system that supplies sealing oil to a shaft sealing portion of a rotary electric machine such as a hydrogen-cooled turbine generator filled with hydrogen gas.

In the conventional sealing oil control system, the sealing oil processing device is equipped with an AC pump (normal sealing oil pump) and a DC pump (emergency sealing oil pump), and the sealing oil supply circuit is equipped with a sealing oil filter and differential pressure adjustment. I'm using a valve. Therefore, when switching from the AC sealing oil pump to the DC sealing oil pump, the sealing oil pressure drops momentarily due to the delay in the response of the valve, and there is a risk of hydrogen gas leaking.
Further, conventionally, since the amount of sealing oil is adjusted by the differential pressure adjusting valve to secure the differential pressure, the oil pressure fluctuation is relatively large with respect to the fluctuation of the gas pressure.

JP-A-59-185136 (see Fig. 2)

In the conventional sealing oil control system, the amount of sealing oil is adjusted by the differential pressure adjusting valve to secure the differential pressure between the hydrogen gas pressure in the generator and the sealing oil pressure, so that it is relatively resistant to fluctuations in hydrogen gas pressure. The oil pressure fluctuation was large. Further, when switching from the AC pump to the DC pump, there is a risk that the sealing oil pressure drops momentarily due to the response delay of the differential pressure adjusting valve and hydrogen gas leaks.

The sealing oil control system of the rotary electric machine according to the present invention is the sealing oil control system of the rotary electric machine provided with a sealing oil supply circuit for supplying the sealing oil to the sealer of the shaft seal portion in the rotary electric machine in which the filled gas is sealed. A surge tank that is arranged above the shaft sealing portion to contain the sealing oil and supply the sealing oil to the sealer, and the encapsulation of the rotary electric machine in which the gas phase portion of the surge tank and the encapsulation gas are sealed. A communication pipe for communicating with the gas-filled portion and an oil level adjusting valve for adjusting the height of the oil level of the sealing oil contained in the surge tank are provided .

According to the present invention, sealing oil is supplied from a surge tank provided above the shaft seal portion to the sealer of the shaft seal portion, and the head pressure difference between the shaft seal portion and the surge tank is used to make the inside of the rotary electric machine. Since the differential pressure between the filled gas pressure and the sealing oil pressure is maintained at a predetermined value, the differential pressure between the filled gas pressure and the sealing oil pressure can be set with a simple configuration, and reliability and maintainability are improved.

It is a system diagram which shows the sealing oil control system of the rotary electric machine in Embodiment 1 which concerns on this invention. It is a system diagram which shows the sealing oil control system of the rotary electric machine in Embodiment 2 which concerns on this invention. It is a system diagram which shows the sealing oil control system of the rotary electric machine in Embodiment 3 which concerns on this invention.

Embodiment 1.
Embodiment 1 according to the present invention will be described with reference to FIG. FIG. 1 is a system diagram showing a sealing oil control system for a rotary electric machine according to the first embodiment.
In FIG. 1, a rotary electric machine (for example, a hydrogen-cooled turbine generator) 1 includes a rotary shaft 2 and a sealer 3 in which hydrogen gas is sealed. The sealing oil discharged from the sealer 3 is introduced into a loop seal tank 4 provided for temporary retention through the sealing oil drain pipe 6.

The sealing oil supplied from the main oil tank (not shown) is supplied to the sealing oil supply device 5 via the pipe 9. The sealing oil supply device 5 is a sealing oil purification tank 7 provided with an oil level adjusting valve 8 for keeping the oil level constant, and a regular AC seal to which the sealing oil purified by the sealing oil purification tank 7 is supplied. An emergency DC sealed oil pump 13 provided in parallel with the oil pump 11 is provided.
Further, the check valve 10 for preventing backflow from occurring inside the sealing oil drainage pipe 6, the pressure adjusting valve 12 for maintaining the outlet pressure of the AC sealing oil pump 11 to be constant, and the AC sealing oil pump 11 discharge the oil. Check valve 14 to prevent backflow of sealed oil, check valve 15 to prevent backflow of sealing oil discharged from DC sealing oil pump 13, filter to remove foreign matter from sealing oil It has 16.

A surge tank 17 for ensuring a differential pressure between the hydrogen gas pressure and the sealing oil pressure is provided on the upper portion of the rotary electric machine 1. The surge tank 17 is provided with an oil level adjusting valve 18 for maintaining a constant oil level of the sealing oil in the surge tank 17, and the sealing oil that has passed through the filter 16 that removes foreign matter from the sealing oil circulates in the sealing oil. It is supplied to the surge tank 17 via the pipe 19 in the route RC. The sealing oil that has exited the surge tank 17 is supplied to the sealer 3 via the sealing oil supply pipe 20 in the sealing oil supply path SC. The rotary electric machine 1 filled with hydrogen gas and the gas phase portion 17 g of the surge tank 17 are connected by a connecting pipe 21. A pipe 22 for returning the sealing oil from the loop seal tank 4 to the main oil tank (not shown) of the rotary shaft lubricating oil, a vacuum pump 25 for evacuating the sealing oil purification tank 7, and an outdoor discharge pipe 26 are provided. ing.

Next, the operation will be described. The hydrogen gas sealed in the gas-filled portion GF inside the rotary electric machine 1 is prevented from being discharged to the atmosphere at the shaft sealing portion FS, and the discharge route to the atmosphere is the sealing oil supply in the sealer 3. It is sealed by a sealing oil that circulates in the sealing oil circuit that includes the path SC. The sealing oil is supplied from the main oil tank (not shown) of the rotary shaft lubricating oil to the sealing oil purification tank 7 of the sealing oil supply device 5. Further, the sealing oil extruded by the AC sealing oil pump 11 is adjusted to a constant value by the pressure adjusting valve 12. The pressure-adjusted sealing oil is supplied to the surge tank 17 and the sealer 3 through the check valve 14 and the sealing oil filter 16, and is discharged through the loop seal tank 4. Further, a DC sealing oil pump 13 is installed in the sealing oil circuit as a backup for the AC sealing oil pump 11.

The sealing oil is supplied to the sealer 3 at a supply pressure that is a constant value higher than the hydrogen gas pressure. In the conventional sealing oil system, a constant differential pressure is secured by installing a differential pressure adjusting valve on the downstream side of the AC sealing oil pump and the DC sealing oil pump, respectively. Therefore, the amount of sealing oil supplied to the sealer 3 The oil pressure fluctuation becomes larger than the gas pressure fluctuation. Further, when switching from the AC sealing oil pump 11 to the DC sealing oil pump 13, the sealing oil pressure drops momentarily due to the delay in the response of the valve, and there is a risk of hydrogen gas leaking.

On the other hand, in the sealing oil control system of the present invention, by applying the surge tank 17 provided above the rotary electric machine 1, the sealing oil pressurized by the head pressure is always supplied to the sealer 3. The differential pressure control valve that was previously installed is no longer required. In addition to the sealing oil supply pipe 20, the surge tank 17 is connected to a connecting pipe 21 for detecting the pressure of the hydrogen gas sealed in the rotary electric machine 1, and the sealing oil is linked to a change in the hydrogen gas pressure. The pressure also changes.

By applying the surge tank 17 as described above, the differential pressure adjusting valve can be omitted and the concern about valve failure is reduced, so that the reliability and maintainability of the system are improved. Further, by installing the surge tank 17, the sealing oil can be supplied without the sealing oil pressure dropping momentarily when the AC sealing oil pump 11 is switched to the DC pump 13.

As shown in FIG. 1, the sealing oil control system for the rotary electric machine according to the first embodiment of the present invention seals the shaft sealing portion FS in the rotary electric machine 1 such as a hydrogen-cooled turbine generator in which an enclosed gas composed of hydrogen gas is sealed. In the sealing oil control system of the rotary electric machine provided with the sealing oil supply circuit SC for supplying the sealing oil to the vessel 3, a surge tank 17 is provided above the shaft sealing portion FS of the rotary electric machine 1, and the shaft sealing portion FS and the surge tank 17 are provided. By utilizing the head pressure difference of the above, the difference pressure between the hydrogen gas pressure and the sealing oil pressure in the rotary electric machine is maintained at a constant predetermined value.
With this configuration, sealing oil is supplied from the surge tank 17 provided above the shaft sealing portion FS to the sealer 3 of the shaft sealing portion FS, and the head pressure difference between the shaft sealing portion FS and the surge tank 17 is utilized. Since the differential pressure between the sealed gas pressure and the sealing oil pressure in the gas-filled portion GF in the rotary electric machine 1 is maintained at a predetermined value, the sealing oil pressure is adjusted from the sealing oil pump to adjust the differential pressure between the filled gas pressure and the sealing oil pressure. The differential pressure between the filled gas pressure and the sealing oil pressure can be set with a simple configuration that omits the operating elements such as the differential pressure adjusting valve for setting, improving reliability and maintainability.
That is, by installing the surge tank 17, it is possible to eliminate the need for a differential pressure adjusting valve that sets the differential pressure between the filled gas pressure and the sealing oil pressure, and there is no concern about valve failure, so reliability and maintainability are improved. improves. Further, when the DC pump is started, the sealing oil is supplied without the sealing oil pressure dropping momentarily.

In the configuration of the preceding paragraph, the sealing oil control system for the rotary electric machine according to the first embodiment of the present invention communicates with the bottom of the surge tank 17 and uses the sealing oil contained in the surge tank 17 as described above. It is characterized in that a supply path SC for supplying to the sealer 3 is provided, and a circulation path RC for circulating the sealing oil discharged from the sealer 3 to the surge tank 17 is provided.
With this configuration, the differential pressure between the filled gas pressure and the sealing oil pressure can be set with a simple configuration, reliability and maintainability are improved, and the sealing oil can be accurately supplied and circulated. An oil control system can be obtained.

In the sealing oil control system of the rotary electric machine according to the first embodiment of the present invention, as shown in FIG. 1, the sealing oil purification tank 7 for purifying the sealing oil is provided in the circulation path RC in the configuration of the preceding paragraph. It is characterized by.
With this configuration, the differential pressure between the filled gas pressure and the sealing oil pressure can be set in a simple configuration, reliability and maintainability are improved, and the sealing oil supply action and circulation action can be accurately performed, and the sealing oil is sealed. It is possible to obtain a sealing oil control system for a rotating electric machine that can reliably purify oil.

In the sealing oil control system of the rotary electric machine according to the first embodiment of the present invention, in any of the configurations of the preceding three paragraphs, as shown in FIG. 1, the height of the oil level of the sealing oil contained in the surge tank 17 It is characterized in that the oil level adjusting valve 18 for adjusting is provided.
With this configuration, it is possible to obtain a sealing oil control system for a rotary electric machine that can more accurately set the differential pressure by the surge tank 17.

As shown in FIG. 1, the sealing oil control system of the rotary electric machine according to the first embodiment of the present invention has the configuration of any of the preceding four items, and as shown in FIG. Is characterized in that the sealed gas-filled portion GF of the rotary electric machine is connected by a connecting pipe 21 so as to communicate with each other. That is, it is characterized in that the pressure of the filled gas sealed in the rotary electric machine is detected by this.
With this configuration, it is possible to obtain a sealing oil control system for a rotary electric machine that can more reliably perform the differential pressure setting action by the surge tank 17.

Embodiment 2.
Embodiment 2 according to the present invention will be described with reference to FIG. FIG. 2 is a system diagram showing a sealing oil control system for a rotary electric machine according to a second embodiment.
In the second embodiment, the differential pressure compensation adjusting valve 23 is installed between the surge tank 17 and the supply pipe 20. The differential pressure correction adjusting valve 23 is provided in the rotary electric machine 1 by utilizing the head pressure difference between the shaft seal portion FS of the rotary electric machine 1 and the surge tank 17 by a surge tank 17 provided above the shaft seal portion FS. In the case where the differential pressure between the hydrogen gas pressure and the sealing oil pressure is maintained at a predetermined value, an adjusting action is performed to correct the differential pressure so as to be more compatible with the required value.
With such a configuration, when switching from the AC sealing oil pump to the DC sealing oil pump, it is possible to continue to supply the sealing oil without fluctuation in the flood pressure. Further, since a constant sealing oil differential pressure can be secured even when the power supply is lost, a system that is safer and more reliable than that of the first embodiment can be constructed.

In the configuration of the first embodiment described above, the sealing oil control system for the rotary electric machine according to the second embodiment of the present invention has a shaft between the surge tank 17 and the shaft sealing portion FS as shown in FIG. It is characterized in that a differential pressure correction adjusting valve 23 for correcting the differential pressure set by the surge tank 17 provided above the sealing portion FS and adjusting the differential pressure to the required value is provided.
With this configuration, it is possible to obtain a sealing oil control system for a rotary electric machine that can more accurately perform the differential pressure setting action by the surge tank 17.

Embodiment 3.
Embodiment 3 according to the present invention will be described with reference to FIG. FIG. 3 is a system diagram showing a sealing oil control system for a rotary electric machine according to a third embodiment.
In the third embodiment, a plurality of surge tank units 17A and 17B are installed in parallel above the shaft sealing portion FS in the rotary electric machine 1 as corresponding to the surge tank 17 in the first embodiment. The function of the tank 17 and the function of the sealing oil purification tank are used in combination.

The sealing oil supplied from the main oil tank (not shown) via the supply pipe 9 is divided into left and right and supplied to the two surge tank units 17A and 17B. Solenoid valves 241 to 244 are provided in the respective surge tank units 17A and 17B, and these solenoid valves 241 to 244 are controlled to perform a sealing oil supply operation to the rotary electric machine 1.
The bottoms of the surge tank units 17A and 17B are communicated with the sealer 3 of the shaft sealing portion FS so as to supply the sealing oil by the sealing oil supply pipe 20 of the supply path SC via the solenoid valves 241,244. Further, the gas phase portion 17g of the surge tank units 17A and 17B and the gas-filled portion GF of the rotary electric machine 1 are connected by a connecting pipe 21 via solenoid valves 242 and 243. Then, the gas phase portions 17g of the surge tank units 17A and 17B and the outdoor discharge pipe 26 are communicated with each other by the solenoid valves 242 and 243 via the vacuum pump 25 as needed.
With such a configuration, the sealing oil purification tank 7, the regular sealing oil pump 11, the pressure adjusting valve 12, and the like used in the first embodiment are not required, so that the cost can be reduced.

Here, the surge tank 17 is configured by installing a plurality of surge tank units 17A and 17B in parallel, and the surge tank units 17A and 17B are selectively operated. The operating mode of the surge tank units 17A and 17B is controlled by solenoid valves 241 to 244.

In the refueling operation state of the surge tank unit 17A that supplies the sealing oil from the surge tank unit 17A to the sealer 3, the electromagnetic valve 241 seals the sealing oil from the surge tank unit 17A via the sealing oil supply pipe 20 of the supply path SC. The sealing oil discharged from the sealer 3 is supplied from the oil return pipe 22 to the main oil tank (not shown) via the sealing oil drain pipe 6 and the loop seal tank 4. To. Sealing oil is replenished to the surge tank unit 17A from the main oil tank (not shown) through the supply pipe 9 and the oil level adjusting valve 18A. Further, the gas phase portion 17g of the surge tank unit 17A is communicated with the gas-filled portion GF of the rotary electric machine 1 via the solenoid valve 243.
In the refueling operation state of the surge tank unit 17A, the surge tank unit 17B is in the sealing oil purification state, and the gas phase portion 17g thereof is communicated with the vacuum pump 25 via the electromagnetic valve 242 to release the vaporized component of the sealing oil outdoors. It is released from the pipe 26 into the atmosphere to purify the sealing oil.

On the other hand, in the refueling operation state of the surge tank unit 17B that supplies the sealing oil from the surge tank unit 17B to the sealer 3, the electromagnetic valve 244 connects the sealing oil from the surge tank unit 17B to the sealing oil supply pipe 20 of the supply path SC. The sealing oil that is operated so as to be supplied to the sealer 3 via the sealer 3 is discharged from the main oil tank (not shown) from the oil return pipe 22 via the seal oil drain pipe 6 and the loop seal tank 4. Will be sent to. Sealing oil is replenished to the surge tank unit 17B from the main oil tank (not shown) through the supply pipe 9 and the oil level adjusting valve 18B. Further, the gas phase portion 17g of the surge tank unit 17B is communicated with the gas-filled portion GF of the rotary electric machine 1 via the solenoid valve 242.
In the refueling operation state of the surge tank unit 17B, the surge tank unit 17A is in the sealing oil purification state, and the vapor phase portion 17g thereof is communicated with the vacuum pump 25 via the electromagnetic valve 243 to release the vaporized component of the sealing oil outdoors. It is released from the pipe 26 into the atmosphere to purify the sealing oil.

The refueling operation state of the surge tank unit 17A and the refueling operation state of the surge tank unit 17B are switched to the refueling operation state of the surge tank unit 17B after the refueling operation state of the surge tank unit 17A continues for a predetermined time. After the refueling operation state of 17B continues for a predetermined time, the refueling operation state is selectively switched between the surge tank unit 17A and the surge tank unit 17B so that the refueling operation state of the surge tank unit 17A can be switched.
In such a selective switching operation of the refueling operation state between the surge tank unit 17A and the surge tank unit 17B, the solenoid valves 241 to 244 are controlled by a sequence control executed by a program as software in an information processing means such as a microcomputer. It can be realized by controlling.

As shown in FIG. 3, the sealing oil control system for the rotary electric machine according to the third embodiment of the present invention seals the shaft sealing portion FS in the rotary electric machine such as a hydrogen-cooled turbine generator in which the filled gas composed of hydrogen gas is sealed. In the sealing oil control system of a rotary electric machine provided with a sealing oil supply circuit SC for supplying the sealing oil to the vessel 3, a surge tank 17 is provided above the shaft sealing portion FS of the rotary electric machine, and the shaft sealing portion FS and the surge tank 17 are provided. By utilizing the head pressure difference of the above, the difference pressure between the hydrogen gas pressure and the sealing oil pressure in the rotary electric machine is maintained at a constant predetermined value, and the surge tank 17 includes a plurality of surge tank units 17A. 17Bs are provided in parallel, and a plurality of the surge tank units 17A and 17B are selectively operated.
With this configuration, by selectively operating a plurality of surge tank units 17A and 17B, the surge tank units 17A and 17B can also act as a sealing oil purification tank, simplifying the configuration and reducing costs. It is possible to obtain a sealing oil control system for a rotary electric machine.

The sealing oil control system for the rotary electric machine according to the third embodiment of the present invention is housed in the first surge tank unit 17A of the plurality of surge tank units 17A and 17B as described in FIG. 3 in the configuration of the preceding paragraph. A first valve device including an electromagnetic valve 241 for supplying the sealing oil to the sealer 3 is provided, and a gas phase portion 17g formed in the second surge tank unit 17B of the plurality of surge tank units 17A and 17B. Is provided with a second valve device including an electromagnetic valve 242 that communicates with a vacuum pump 25 for exhaust, and is formed in the first surge tank unit 17A of the plurality of surge tank units 17A and 17B. A third valve device including an electromagnetic valve 243 that communicates the gas phase portion 17 g to the vacuum pump 25 for exhaust is provided, and is housed in the second surge tank units 17B of the plurality of surge tank units 17A and 17B. A fourth valve device including an electromagnetic valve 244 for supplying the sealed oil to the sealer 3 is provided.
With this configuration, it is possible to obtain a sealing oil control system for a rotary electric machine capable of accurately performing selective operation in a plurality of surge tank units 17A and 17B.

In the sealing oil control system of the rotary electric machine according to the third embodiment of the present invention, in the configuration of the preceding paragraph, the first to fourth valve devices composed of electromagnetic valves 241 to 244 are used as software in information processing means such as a microcomputer. It is characterized in that it is operated by sequence control executed by the program of.
With this configuration, it is possible to obtain a sealing oil control system for a rotary electric machine that can accurately switch between a sealing oil supply operation function and a purification function by sequence control.

In the sealing oil control system of the rotary electric machine according to the third embodiment of the present invention, in any of the configurations in the preceding three paragraphs, the sealing oil is supplied from the first surge tank unit composed of the surge tank unit 17A to the sealer 3. The refueling operation state of the first surge tank unit to be supplied and the refueling operation state of the second surge tank unit for supplying the sealing oil from the second surge tank unit composed of the surge tank unit 17B to the sealer 3 are. After the refueling operation state of the first surge tank unit composed of the surge tank unit 17A continues for a predetermined time, the refueling operation state of the second surge tank unit composed of the surge tank unit 17B is switched to, and the surge tank unit is switched to the refueling operation state. After the refueling operation state of the second surge tank unit composed of 17B continues for a predetermined time, the surge tank unit 17A is switched to the refueling operation state of the first surge tank unit composed of the surge tank unit 17A. It is characterized in that the refueling operation state can be selectively switched between the surge tank unit 17B and the surge tank unit 17B.
With this configuration, the sealing oil is alternately switched at regular intervals between the first surge tank unit composed of the surge tank unit 17A and the second surge tank unit composed of the surge tank unit 17B. It is possible to obtain a sealing oil control system for a rotary electric machine that can accurately perform the refueling operation function and the purification function of the above.

In the sealing oil control system of the rotary electric machine according to the third embodiment of the present invention, in the configuration of the preceding paragraph, as described in FIG. 3, the second valve device 242 is the first surge in the third valve device 243. The gas phase portion 17g formed in the second surge tank unit 17B is filled with the enclosed gas of the rotary electric machine in response to the operation of communicating the gas phase portion 17g formed in the tank unit 17A with the vacuum pump 25 for exhaust. The third valve device 243 communicates the gas phase portion 17g formed in the second surge tank unit 17B of the second valve device 242 with the vacuum pump 25 for exhaust. With this configuration, a plurality of surge tanks are operated so as to communicate the gas phase portion 17g formed in the first surge tank unit 17A with the filled gas filling portion GF of the rotary electric machine according to the operation. It is possible to obtain a sealing oil control system for a rotary electric machine capable of accurately performing a selective operation including a communication action of the gas phase portion 17 g of the units 17A and 17B with the filled gas filling portion GF of the rotary electric machine.

In the present invention, the embodiments can be freely combined, and the embodiments can be appropriately modified or omitted within the scope of the invention.

1 rotary electric machine, second rotary shaft, 3 sealer, 4 loop seal tank 6 sealing oil scavenge tube, 7 sealing oil purification tank, 8 oil level adjustment valve, 9 supply pipe, 10 a check valve, 11 AC sealing oil pump , 12 pressure regulating valve, 13 DC sealing oil pump, 14 a check valve, 15 a check valve, 16 sealing oil filter, 17 a surge tank, 17A, 17B surge tank unit, 17 g gas phase, 18, 18A, 18B oil level regulating valve 19 piping, 20 seal oil supply pipe, 21 connecting pipe, 22 oil return pipe, 23 a differential pressure correction control valve, 2 41-244 solenoid valve, 25 a vacuum pump, 26 outdoor discharge pipe.

Claims (7)

In a rotary electric machine sealing oil control system equipped with a sealing oil supply circuit that supplies sealing oil to a sealer of a shaft seal portion in a rotary electric machine that seals an enclosed gas .
Is disposed above the front Symbol shaft sealing portion, housing the sealing oil, the surge tank for supplying the sealing oil to the sealer,
A communication pipe that communicates the gas phase portion of the surge tank with the filled gas-filled portion of the rotary electric machine in which the filled gas is sealed, and
An oil level adjusting valve that adjusts the height of the oil level of the sealing oil contained in the surge tank.
A sealing oil control system for rotary electric machines, which is characterized by the provision of. A supply path for supplying the sealing oil contained in the surge tank to the sealer is provided so as to communicate with the bottom of the surge tank, and a circulation path for circulating the sealing oil discharged from the sealer to the surge tank is provided. The sealing oil control system for a rotary electric machine according to claim 1. The sealing oil control system for a rotary electric machine according to claim 2, wherein a sealing oil purification tank for purifying the sealing oil is provided in the circulation path. The sealing oil control system for a rotary electric machine according to claim 1, wherein a differential pressure compensating adjusting valve is provided between the surge tank and the shaft sealing portion. The sealing oil control system for a rotary electric machine according to claim 1, wherein a plurality of surge tank units are provided in parallel as the surge tank, and the plurality of surge tank units are selectively operated. A first valve device for supplying the sealing oil contained in the first surge tank unit in the plurality of surge tank units to the sealer is provided, and the second surge tank unit in the plurality of surge tank units is formed. A second valve device for communicating the gas phase portion to the vacuum pump for exhaust is provided, and the gas phase portion formed in the first surge tank unit in the plurality of surge tank units. A third valve device for communicating with a vacuum pump for exhaust is provided, and a fourth valve device for supplying the sealing oil contained in the second surge tank unit in the plurality of surge tank units to the sealer. The sealing oil control system for a rotary electric machine according to claim 5, wherein The second valve device is formed in the second surge tank unit according to the operation of communicating the gas phase portion formed in the first surge tank unit in the third valve device with the vacuum pump for exhaust. The gas phase portion operates so as to communicate with the filled gas filling portion of the rotary electric machine, and the third valve device is a gas phase portion formed in the second surge tank unit in the second valve device. 6. Claim 6 characterized in that the gas phase portion formed in the first surge tank unit operates so as to communicate with the filled gas filling portion of the rotary electric machine in response to the operation communicating with the vacuum pump for exhaust. The sealing oil control system for rotary electric machines described in.

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