JP5438720B2 - Sealing oil supply device for rotating electrical machines - Google Patents

Description

  The present invention relates to a sealing oil supply device that supplies sealing oil to a shaft seal portion of a rotating electrical machine in which hydrogen gas is sealed.

A heating part such as a coil of the hydrogen-cooled turbine generator is cooled by hydrogen gas. On the other hand, the shaft seal portion is provided with an oil seal portion (sealing device) using oil (sealing oil) given a certain pressure to prevent hydrogen gas from leaking to the outside. This oil is supplied by a sealing oil supply device.
In a conventional sealing oil supply device, for example, the sealing oil of a sealer is connected to a vacuum tank by an oil supply pipe and a drain oil pipe, and the sealing oil recovered from the generator side is temporarily stored in the vacuum tank and vacuum deaerated. Later, it is re-supplied to the sealer. At this time, air, hydrogen gas, etc. contained in the recovered sealing oil are vacuum degassed and discharged from the exhaust pipe connected to the upper part of the vacuum tank body to the outside of the tank. The exhaust pipe is connected to the suction part of the vacuum pump, and the gas mixed with air, oil, moisture, etc. is sent to the oil chamber (oil separator) through the vacuum pump. In the oil separator, gas, oil and water are separated, the gas is discharged upward, the accumulated water is drained from the lower side, and the oil is returned to the vacuum pump for reuse (for example, patents) Reference 1).

JP 2008-38778 A (page 2-3, FIG. 4)

In the conventional apparatus such as Patent Document 1, the separation between the oil and the water in the oil separator is not always good, and the water may enter the vacuum pump. There was a problem that the cycle of replacement and disassembly and cleaning of the apparatus was shortened.
In addition, there is a problem that the vacuum pump may be burned out when moisture enters the vacuum pump.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a sealing oil supply device for a rotating electrical machine with improved separation between oil and moisture.

  The sealing oil supply device for a rotating electrical machine according to the present invention supplies a sealing oil to a shaft seal portion of a rotating electrical machine in which hydrogen gas is sealed, collects the sealing oil that has passed through the shaft seal portion, and performs vacuum deaeration. And a sealing oil supply device for a rotating electrical machine having an oil separator that introduces exhaust gas exhausted from the vacuum tank via a vacuum pump and separates oil and moisture from the exhaust gas. An exhaust gas introduction pipe arranged to protrude from the inside to a predetermined height and a guide pipe having an inclined surface opened in a funnel shape at the top and concentrically arranged with a gap from the outer periphery of the introduction pipe The oil and water separated from the exhaust gas introduced into the oil separator are collected at the bottom through the guide tube, and the upper oil is supplied to the vacuum pump from the oil supply pipe connected to the side surface. Water is discharged to the outside via a water gauge connected to the bottom surface. It is obtained by configured to be.

  According to the sealing oil supply device for a rotating electrical machine of the present invention, the oil separator has an exhaust gas introduction pipe disposed so as to protrude upward from the bottom surface, and an inclined surface opened in a funnel shape at the top. It has a guide pipe that is concentrically arranged with a gap between the outer circumference of the pipe, and oil and moisture separated from the exhaust gas are collected at the bottom through the guide pipe, and the oil is vacuumed from the oil supply pipe connected to the side. The pump is configured so that moisture is discharged to the outside via a water gauge connected to the bottom surface. This improves oil and moisture separation, preventing moisture from entering the vacuum pump. it can. For this reason, the replacement | exchange operation | work of the lubricating oil of a vacuum pump and the period of disassembly cleaning can be extended. Moreover, the danger that a vacuum pump will burn out can be reduced.

It is a systematic diagram which shows the sealing oil supply apparatus of the rotary electric machine by Embodiment 1 of this invention. It is principal part sectional drawing of FIG. It is a systematic diagram which shows the sealing oil supply apparatus of the rotary electric machine by Embodiment 2 of this invention. It is principal part sectional drawing of FIG. It is a systematic diagram which shows the sealing oil supply apparatus of the rotary electric machine by Embodiment 3 of this invention. It is principal part sectional drawing of FIG.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings.
FIG. 1 is a system diagram showing a sealing oil supply device for a rotating electrical machine according to Embodiment 1 of the present invention, which is shown together with the rotating electrical machine. FIG. 2 is an enlarged view of a main part of FIG. The rotating electrical machine is, for example, a hydrogen-cooled turbine generator.

In FIG. 1, a rotating electrical machine 1 is provided in a rotating shaft 2 penetrating a sealed chamber 1a filled with hydrogen gas and bearing chambers provided at both ends in the axial direction of the rotating electrical machine 1 using sealing oil. It has a sealer 3 as a shaft seal portion that seals the gap between the sealed chamber 1a and the rotary shaft 2.
The sealing oil discharged from the sealer 3 is sent to the vacuum tank 5 through which the sealing oil is vacuum degassed via the sealing oil drain pipe 4. The upstream side of the sealer 3 and the vacuum chamber 5 are connected to each other by a seal oil supply pipe 6 that supplies seal oil to the sealer 3.

A sealing oil pump 7 for supplying the sealing oil in the vacuum chamber 5 to the sealing device 3 and a differential pressure adjusting valve 8 for adjusting the hydraulic pressure of the sealing oil supplied to the sealing device 3 are attached to the sealing oil supply pipe 6. It has been. The differential pressure adjusting valve 8 allows the sealing oil controlled so as to be higher than the hydrogen gas pressure inside the rotating electrical machine 1 by a certain value to pass therethrough.
One end of a sealing oil return pipe 9 for returning the sealing oil that cannot pass through the differential pressure adjusting valve 8 to the vacuum chamber 5 between the sealing oil pump 7 and the differential pressure adjusting valve 8 of the sealing oil supply pipe 6. The other end is led into the vacuum chamber 5 and connected to the spray nozzle.
The vacuum tank 5 is provided with an oil level adjustment valve 10 for keeping the oil level of the sealing oil constant. Further, the vacuum chamber 5 has a gas discharge pipe 11 for discharging a gas containing air, oil, moisture, etc., and this gas discharge pipe 11 is connected to the vacuum pump 12 and further introduced from the vacuum pump 12. It is connected to an oil separator 14 via a pipe 13. The leading end side of the introduction pipe 13 is provided so as to protrude upward from the bottom of the oil separator 14.

The oil separator 14 is provided with a discharge pipe 15 for releasing gas to the outside on the upper side of the container, a drain pipe 16 on the bottom surface, and water separated by the oil separator 14 is supplied to the drain pipe 16. A quantity water gauge 17 which is a stored water reservoir is connected, and a drain valve 18 for draining the accumulated water to the outside is connected to the lower part thereof. Further, an oil supply pipe 19 for supplying the separated oil as a lubricating oil to the vacuum pump 12 is connected to the side surface of the container of the oil separator 14.
Further, as a characteristic part of the present invention, the oil separator 14 is provided with a guide tube 20 arranged concentrically with a gap from the outer periphery of the introduction tube 13.

FIG. 2 is a detailed cross-sectional view of the oil separator 14 portion of FIG. As shown in the drawing, the introduction pipe 13 is arranged so as to protrude from the vicinity of the center of the bottom surface of the oil separator 14 to the upper part inside to a predetermined height. The guide tube 20 has an inclined surface 20a that opens in a funnel shape at the top and a cylindrical portion 20b that follows the inclined surface 20a. The guide tube 20 is concentrically disposed so as to surround the introduction tube 13, and the lower end of the cylindrical portion 20b. On the side, a gap is provided with respect to the bottom surface of the oil separator 14.
In the above description, the portion surrounded by the alternate long and short dash line in FIG.

Next, the operation will be described.
The hydrogen gas in the rotating electrical machine 1 is sealed by sealing oil circulating in a sealing oil supply circuit connected to the sealer 3 as shown in FIG. The sealing oil is sent out by the sealing oil pump 7 and is adjusted by the differential pressure adjusting valve 8 so as to be higher than the hydrogen gas in the rotating electrical machine 1 by a certain value. The adjusted sealing oil passes through the sealing oil supply pipe 6 and is sent to the sealer 3. In the sealer 3, the sealing oil comes into contact with the outside air, contains air, moisture, hydrogen gas, etc., passes through the sealing oil drain pipe 4, is collected into the vacuum tank 5, and is vacuum deaerated in the vacuum tank 5.
The degassed gas degassed in the vacuum chamber 5 is sent to the vacuum pump 12 through the gas discharge pipe 11, and is then discharged upward from the oil separator 14 through the introduction pipe 13. The oil separator 14 separates gas, oil, and moisture, and the gas is discharged to the outside through the discharge pipe 15. Moisture and oil are accumulated below the oil separator 14 by their own weight.

  At this time, if the guide tube 20 is not installed, the liquid separated from the gas is discharged to the upper part of the already accumulated oil in a state where the oil and water are mixed. Moisture with high specific gravity sinks in the oil, but since there is an oil supply pipe 19 on the way, a part of the water is supplied to the vacuum pump 12 together with the oil. If moisture is supplied to the vacuum pump 12 together with oil, there is a risk of the vacuum pump 12 burning out, and the deterioration of the lubricating oil is promoted.

  On the other hand, in the case of the present application in which the guide tube 20 is installed, as shown in FIG. 2, the mixed gas containing the oil and moisture sent from the introduction tube 13 into the oil separator 14 and discharged upward is a reflector. The separated gas is repelled and discharged from the upper discharge pipe 15, and the oil and moisture are discharged to the bottom of the oil separator 14 through the guide pipe 20 and accumulated. Since water has a higher specific gravity than oil, the water separated and accumulated in the lower layer passes through the water distribution pipe 16 and enters the water meter 17. The permeation window of the metering water gauge 17 is monitored, and when a certain amount of water has accumulated, the drain valve 18 is opened to drain the water. On the other hand, since the oil component having a specific gravity smaller than that of water is separated and collected in the upper layer of the reservoir, only the oil component not containing water is supplied to the vacuum pump 12 through the oil supply pipe 19 on the side of the container and used as lubricating oil.

  As described above, according to the sealing oil supply device for a rotating electrical machine of the first embodiment, the sealing oil is supplied to the shaft seal portion of the rotating electrical machine in which hydrogen gas is sealed, and the sealing oil that has passed through the shaft sealing portion is recovered. A vacuum tank for vacuum degassing, and a sealing oil supply device for a rotating electrical machine equipped with an oil separator that introduces exhaust gas exhausted from the vacuum tank via a vacuum pump and separates oil and moisture from the exhaust gas The oil separator has an exhaust gas introduction pipe arranged so as to protrude from the bottom surface to a predetermined height upward, and an inclined surface opened in a funnel shape at the top, and a gap is formed between the outer circumference of the introduction pipe. An oil supply pipe having a guide pipe arranged concentrically, the oil and water separated from the exhaust gas introduced into the oil separator are accumulated at the bottom through the guide pipe, and the upper oil is connected to the side surface. The water in the lower layer is supplied to the vacuum pump from the water gate connected to the bottom. Since it is configured so as to be discharged to the outside via the, in order to improve the separation of oil and water, it can be prevented from entering water into the vacuum pump. For this reason, replacement of the lubricating oil of the vacuum pump and the period of disassembly cleaning can be extended. Moreover, the danger that a vacuum pump will burn out can be reduced.

Embodiment 2. FIG.
FIG. 3 is a system diagram showing a sealing oil supply device for a rotating electrical machine according to Embodiment 2 of the present invention, and FIG. 4 is an enlarged view of a main part of FIG. The same parts as those in FIG. 1 are denoted by the same reference numerals, description thereof will be omitted, and differences will be mainly described.

As shown in FIG. 3, in this embodiment, an overflow pipe 21 is installed instead of the drain valve 18 shown in FIG. 1 of the first embodiment. One end of the overflow pipe 21 is connected to the lower side of the water meter 17, the other end is bent upward, raised to a predetermined height, and the tip is bent slightly downward.
With such a configuration, as shown in FIG. 4, when a certain amount or more of water accumulates in the metering water gauge 17, the water is discharged from the overflow pipe 21, so that the drain valve 18 is manually operated as in the first embodiment. The drainage work by operation becomes unnecessary.

  As described above, according to the sealing oil supply device for a rotating electrical machine of the second embodiment, when the overflow pipe is connected to the drainage side of the metering water gauge, when a certain amount or more of water has accumulated in the metering water gauge part. Since it is configured to automatically discharge from the overflow pipe, in addition to the effects of the first embodiment, the draining operation is simplified.

Embodiment 3 FIG.
5 is a system diagram showing a sealing oil supply device for a rotating electrical machine according to Embodiment 3 of the present invention, and FIG. 6 is an enlarged view of a main part of FIG. The same parts as those in FIG. 1 are denoted by the same reference numerals, description thereof will be omitted, and differences will be mainly described.

The difference from the first embodiment is that a filter 22 made of fiber or the like is installed inside the cylindrical portion 20b of the guide tube 20 arranged inside the oil separator 14. Other than that, it is all equivalent to the first embodiment.
With such a configuration, when the liquid mixed with moisture and oil is discharged downward through the guide tube 20, the moisture contained in the oil is condensed and increased when passing through the filter 22. Therefore, after water is discharged to the lower part of the oil separator 14, it becomes easy to sink into the water meter 17 and the oil and water separability is further improved.
Instead of the drain valve 18, the overflow pipe 21 described in the second embodiment may be used.

  As described above, according to the sealing oil supply device for a rotating electrical machine of the third embodiment, since the filter for promoting the aggregation of moisture is provided inside the guide tube, in addition to the effects of the first or second embodiment, It is possible to provide a sealing oil supply device for a rotating electrical machine in which oil and moisture separation properties are further improved.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 1a Sealed chamber 2 Rotating shaft 3 Sealing device (shaft seal)
4 Sealed oil drain pipe 5 Vacuum tank 6 Sealed oil supply pipe 7 Sealed oil pump 8 Differential pressure regulating valve 9 Sealed oil return pipe 10 Oil level regulating valve 11 Gas discharge pipe 12 Vacuum pump 13 Introducing pipe 14 Oil separator 15 Release pipe 16 Drain pipe 17 Quantity water gauge 18 Drain valve 19 Oil supply pipe 20 Guide pipe 20a Inclined surface 20b Cylindrical part 21 Overflow pipe 22 Filter 31 Sealed oil supply device.

Claims (3)

A vacuum tank that supplies sealing oil to a shaft seal portion of a rotating electrical machine in which hydrogen gas is sealed, collects the seal oil that has passed through the shaft seal portion, and performs vacuum deaeration, and an exhaust gas exhausted from the vacuum chamber In a sealed oil supply device of a rotating electrical machine equipped with an oil separator that separates oil and moisture from the exhaust gas, through a vacuum pump,
The oil separator has the exhaust gas introduction pipe disposed so as to protrude from the bottom to the inside upward at a predetermined height, and an inclined surface opened in a funnel shape at the top, and opens a gap from the outer periphery of the introduction pipe. The oil and water separated from the exhaust gas introduced into the oil separator are accumulated at the bottom through the guide tube, and the upper oil is disposed on the side surface. A sealing oil supply device for a rotating electrical machine, wherein the oil supply pipe is supplied from a connected oil supply pipe to the vacuum pump, and the moisture in the lower layer is discharged to the outside through a water gauge connected to the bottom surface. The sealing oil supply device for a rotating electrical machine according to claim 1,
An overflow pipe is connected to the drain side of the quantity water gauge, and is configured to be automatically discharged from the overflow pipe when a certain amount or more of the water has accumulated in the quantity water gauge section. Sealing oil supply device for rotating electrical machines. In the sealing oil supply apparatus of the rotary electric machine according to claim 1 or 2,
A sealing oil supply device for a rotating electrical machine, wherein a filter for promoting the aggregation of the moisture is provided inside the guide tube.

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