JPH0721090Y2 - Sealing oil supply device for rotating electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a double-flow method in which sealing oil is separately supplied to the shaft seal portion of a rotating electric machine in which hydrogen gas is enclosed as a cooling gas, inside the machine and outside the machine, respectively. Type sealing oil supply device.

[Prior Art] Hereinafter, a conventional double-flow type sealing oil supply device will be described with reference to a system diagram shown in FIG. In the figure, 1 is a rotary electric machine such as a turbine generator in which hydrogen gas is sealed, 2 is a rotary shaft of the rotary electric machine, 3 is a hydrogen gas in the rotary electric machine 1, which is provided in a shaft penetrating portion of the rotary electric machine 1. To prevent the oil from leaking from the shaft penetrating portion. Reference numeral 4 denotes a seal oil supply pipe on the inside of the machine for supplying the seal oil to the inside of the sealer 3. Reference numeral 5 denotes the seal oil to the outside of the sealer 3. Outside machine oil seal pipe, 6
Is a seal oil drain pipe on the inside of the machine, 7 is a seal oil drain oil of the machine outside and bearing oil (not shown) is discharged as a unit, 8
Is a hydrogen gas shutoff tank for shutting off hydrogen gas in the rotating electric machine 1 and hydrogen-side sealing oil exhaust oil, 9 is a loop seal tank for exhausting hydrogen gas and air mixed in bearing exhaust oil, and 10 is a machine-side sealing oil A pump, 11 is an outside-sealing oil pump, and 12 is a differential pressure adjusting valve for adjusting the outside-sealing oil pressure so that the hydrogen gas pressure in the rotary electric machine 1 is always increased by a constant value (for example, 0.85 kg / cm ² ). , 13 are equalizing valves for adjusting the outer side hydraulic pressure and the inner side hydraulic pressure to the same pressure.

In the double-flow sealing oil supply device configured as described above,
If the equalizing valve controls the inner side sealing oil pressure and the outer side sealing oil pressure to be completely equal, mixing of the inner side sealing oil and the outer side sealing oil will not occur, but in reality the equalizing valve may not be used. Even if it is done, the sealing oil inside the machine and the sealing oil outside the machine are mixed due to some control error of the pressure equalizing valve. Since air is melted in the machine-side sealing oil, there is a problem that when mixed in the machine-side sealing oil, the melted air is released into the machine hydrogen gas and the purity of the hydrogen gas is lowered. One method for solving such a problem is disclosed in JP-A-60-102838. That is, FIGS. 1 and 2 of the same publication show that the oil degassed by the vacuum tank 17 is supplied to the inside of the machine.

[Problems to be solved by the device]

However, in the configuration shown in the same issue, as a result of the hydrogen gas dissolved in the machine interior sealing oil being removed in the vacuum tank 17, there has been a problem that the hydrogen gas is heavily consumed.

The present invention is to solve the above problems.

[Means for Solving the Problems]

A sealing oil supply device for a rotary electric machine according to the present invention is a sealer for sealing a shaft of a rotary electric machine, in which a cooling gas is sealed,
In a double-flow type sealed oil supply device that supplies sealing oil separately inside and outside the machine, a vacuum tank for vacuum degassing the oil sucked into the pump is provided upstream of the pump suction port of the outside sealing oil circuit. It is a thing.

[Action]

In the sealing oil supply device of the rotating electric machine according to the present invention, even if the sealing oil outside the machine is mixed into the sealing oil inside the machine due to some control error of the pressure equalizing valve, the air melted in the sealing oil outside the machine is a vacuum tank. Since the vacuum degassing process is performed in step 1, the purity of the hydrogen gas in the machine does not decrease, and it is not necessary to degas the inside sealing oil.

〔Example〕

FIG. 1 shows an embodiment of the present invention. In FIG. 1, 14 is a vacuum tank and 15 is a float valve. Other configurations are the same as in FIG.

The vacuum tank 14 is used for vacuum deaeration of the outer sealing oil. In the system of the present invention, since the outer side sealing oil is degassed in the vacuum tank 14, even if mixed with the inner side sealing oil, the purity of the in-machine hydrogen gas does not decrease, so the inner side sealing oil is degassed. There is no need. In the figure, the pipe connecting the hydrogen gas cutoff tank 8 to the vacuum tank 14 is an oil drain pipe that normally flows only when oil does not flow and the oil level of the hydrogen gas cutoff tank 8 rises.

When the vacuum tank 14 becomes empty, there will be problems such as the outside air sealing oil pump burning out and the outside sealing oil supply becoming impossible.Therefore, the float valve 15 is arranged to control the oil level of the vacuum tank 14 at a constant level. ing. That is, when the oil level in the vacuum tank 14 drops, the float valve 15 opens to supply oil, and conversely when the oil level rises, the float valve 15 closes to keep the oil level in the vacuum tank 14 constant.

Further, the return oil of the differential pressure regulating valve 12 is returned to the vacuum tank 14 and the bypass oil is circulated to the vacuum tank to enhance the effect of the vacuum deaeration process.

[Effect of device]

According to the sealing oil supply device of the present invention configured as described above, even if the sealing oil inside the machine and the sealing oil outside the machine are mixed due to the error of the pressure equalizing valve, the purity of the hydrogen gas inside the machine is not lowered. Absent. Further, since it is not necessary to deaerate the sealing oil inside the machine, consumption of hydrogen gas can be reduced.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention, and FIG. 2 is a system diagram showing a conventional double-flow sealing oil supply device. In the figure, 1 is a rotary electric machine, 2 is a rotary shaft, 3 is a sealer, 4 is a machine-side sealed oil supply pipe, 5 is a machine-side sealed oil supply pipe, 11 is a machine-side sealed oil pump, and 12 is a differential pressure regulating valve. , 13 is a pressure equalizing valve, 14 is a vacuum tank, and 15 is a float valve. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A recirculation type seal for supplying sealing oil to a sealer for sealing a shaft of a rotary electric machine, in which hydrogen gas is sealed, by means of separate oil circuits each having an oil supply pump inside and outside the machine. In the oil supply apparatus, a sealed oil supply apparatus for a rotary electric machine, characterized in that a vacuum tank for vacuum degassing the oil sucked by the pump is provided upstream of the pump suction port of the outer side sealed oil circuit.