JPS6014898Y2 - Lubricant intrusion prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lubricant intrusion prevention device in a gas turbine.

In a gas turbine, a turbine wheel and a compressor wheel that rotate at high speed are supported on a shaft by bearings.

Therefore, this bearing is lubricated by oil supply, but due to the functionality of the gas turbine, if this oil leaks into the compressor, problems will occur, so the sealing mechanism must be perfect.

Conventionally, sealing mechanisms have been expensive even if fully implemented, and there have been concerns about the durability of the materials.

The purpose of the present invention is to overcome the above-mentioned drawbacks by introducing the pressure of the pressurized fluid of the compressor into the bearing location to prevent oil leakage.

That is, in the present invention, a compressor wheel is mounted on the same axis as the turbine wheel with a fixing nut, a bearing supporting the shaft is arranged in the compressor case at the outer end of the compressor wheel via a holder, and the bearing is attached to the compressor case. An oil passage for supplying oil is provided in the compressor case and the holder, and a passage that opens around the fixing nut at a position between the bearing and the compressor wheel is formed in the compressor case and the holder. The lubricant intrusion prevention device is characterized in that the other end of the passage is connected to the discharge side of the compressor to supply pressurized air.

According to the present invention, oil leakage can be prevented with a simple structure and reliability can be further improved.

The present invention will now be described in detail with reference to preferred embodiments illustrated in the accompanying drawings.

As shown in FIG. 1, a shaft 2 integral with a compressor wheel 1 is supported by bearings 4 and 5, and a compressor wheel 3 is mounted on this shaft 2.

The turbine case 6 is connected to a bearing housing 8,
This bearing housing 8 is connected to the compressor case 7.

The bearing 4 is attached to a bearing housing 8, and the bearing 5 is attached to a holder 9 attached to a compressor case 7.

The compressor wheel 3 is mounted by tightening a nut 11 through a lock washer 10.

When combustion gas is introduced by the above mechanism, the turbine wheel 1 rotates, and the compressor wheel 3, which rotates at the same time as the shaft 2, is driven, and the compressed air passes through the diffuser 12, diffuses through the combustor, and is introduced to the turbine. It will be destroyed.

The bearing 4 is supplied with lubricating oil from an oil passage 13 provided in the bearing housing 8 , and the bearing 5 is supplied with lubricating oil from an oil passage 14 provided in the compressor case 7 .

As shown in FIGS. 2 and 3, a chamber 15 is formed between the holder 9 and the compressor case 7 and communicates with the oil passage 14. As shown in FIGS.

Furthermore, an oil passage 16 is provided in the holder 9 in communication with the chamber 5 .

The oil passage 16 communicates with an oil passage 17 of the bearing 5 to lubricate the space between the shaft 2 and the bearing 5.

18 and 19 are O-rings, and 20 and 21 are piston rings.

The air diffused through the diffuser 12 is supplied to the combustor through the passage 22, which is in communication with the passage 22.
3 is provided in the compressor case 7.

Furthermore, passages 24 and 25 are provided in the compressor case 7 in communication with the passage 23.

Further, a passage 26 is provided in the holder 9 in communication with the passage 25.

The passage 26 communicates with a gap 27 provided between the holder 9 and the nut 11 between the piston rings 20,21.

Note that oil on the bearing 4 side is sealed by a sealing material 2B.

With the above-described configuration, the lubricating oil supplied from the oil passage 14 passes through the chamber 15 and the oil passages 16 and 17, is supplied to the bearing 5, and lubricates between the bearing 15 and the shaft 2.

On the other hand, the compressed air branched from the passage 22 and supplied to the passage 23 passes through passages 24, 25, and 26, and is supplied to the gap 27 between the holder 9 and the nut 11, thereby pressurizing the gap 27.

Therefore, oil leaking from the bearing 5 can be suppressed from entering, and oil can be prevented from leaking into the compressor case 7.

As described above, according to the present invention, it is possible to prevent oil leakage from entering the compressor case with a simple structure, thereby eliminating troubles caused by this and improving reliability.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a gas turbine embodying the present invention, FIG. 2 is an enlarged sectional view of the main part of FIG. 1, and FIG. 3 is an enlarged sectional view of the main part of FIG. 2. 1... Turbine wheel, 2... Shaft, 3... Compressor wheel, 4, 5...
... Bearing, 6 ... Turbine case, 7.
...Compressor, end...Bearing housing, 9...Holder, 10...Lock washer, 11...Nut, 12...
・Diffuser, 13, 14...Oil passage, 15・
...Room, 16.17...Oil road, 18.1
9...O ring, 20.21...Piston ring, 22, 23, 24.25, 26...
・Aisle, 27...Gap.

Claims (1)

[Scope of utility model registration request] A compressor wheel is mounted coaxially with the turbine wheel with a fixing nut, a bearing supporting the shaft is disposed in the compressor case at the outer end of the compressor wheel via a holder, and the compressor case is supplied with oil to the bearing. and a passage provided in the holder and opening around the fixing nut at a position between the bearing and the compressor wheel is formed in the compressor case and the holder, and the other end of the passage is connected to the exhaust of the compressor. A lubricant intrusion prevention device characterized by communicating with the side and supplying pressurized air.