JP2786552B2 - Generator for gas turbine engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to Antofagasta such as helicopter
Turbine on the generator engine.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional small-sized generator for supplying electric power to an electronic engine controller of a gas turbine engine.

A gear 3 is provided at one end of the rotating shaft 1.
Is inserted into the accessory drive gearbox 10 of the engine and is connected to the gears in the gearbox 10. A fan 15 is coaxially mounted on the outer end of the gearbox 10 of the rotating shaft 1. Furthermore, the rotor 5 of the generator is mounted coaxially. In the figure, 9 is a bearing, and 8 is an oil seal.

The generator casing 16 has a flange a at one end.
And a coaxial air inlet b at the other end. Further, a coil 6 of the generator facing the rotor 5 is coaxially provided on the inner surface. Further, the casing 16 has an air hole c on the gear box 10 side of the coil 6. The casing 16 is attached to the gearbox 10 at the flange a.

As described above, when the engine rotates, the rotor 5 rotates via the gear 3 to generate electric power. Cooling fan 15
The cooling air 13 cools the coil 6 and the rotor 5 from the air inlet b through the coil 6 and is discharged from the air hole c.

On the other hand, a hollow rotary shaft 1a having a gear 3a and a centrifugal oil separator 4 coaxially is inserted into one end of the gear box 10. The outer end of the gear box 10 of the rotating shaft 1a is provided with a cover 17 having an exhaust duct 14.
Covered with. In the figure, 9a is a bearing, and 8a is an oil seal.

In the above, the breather air 12 that has flowed into the accessory drive gearbox 10 from the rotating part seal of the main shaft of the engine and the like has been separated from the oil by the centrifugal oil separator 4 and then exhausted through the exhaust duct 14.

[0008]

In the above-mentioned conventional method, since the generator and the oil separator are separately mounted on the shaft, an independent space is required and a compact design cannot be achieved. Also, a cooling fan was required for the generator. Therefore, in a helicopter engine used in an area where there is a lot of dust and the like, there was a problem that the cooling fan was subjected to erosion wear in a short time.

[0009]

The present invention employs the following means to solve the above-mentioned problems.

[0010] That is, as a generator for a gas turbine engine has a centrifugal oil separator in the end with one end to the accessory drive within Giabokkusu of a gas turbine engine the ends are inserted rotatably to Gia bond, A rotating shaft having a hollow communicating with the oil separator, a generator rotor coaxially mounted on the other end of the rotating shaft, and a generator coil facing the rotor coaxially inside; A generator casing having a coaxial exhaust port at one end and the other end coaxially coupled to the rotating shaft in the accessory drive gearbox, wherein the generator casing has an air flow into the gearbox side of the coil. It has a hole, and the inner surface of the base of the exhaust port has an ejector clearance with respect to the end of the rotating shaft.

[0011]

According to the above-mentioned means, the rotating shaft rotates together with the rotation of the gas turbine engine, and the rotor rotates to become a generator.

On the other hand, the breather air containing oil passes through a centrifugal oil separator, after which the oil is separated, passes through the rotating shaft and is discharged from the exhaust port. The air passing through the rotating shaft cools the rotor from the inside, and when passing through the end of the rotor, the air in the coil part is ejected from the clearance for ejector between the end and the inner surface of the base of the exhaust port by the ejector action. Inhale and exhaust. Therefore, after air flows in from the air inlet and cools the coil and the rotor, it is discharged from the exhaust port through the clearance.

In this way, the generator can be easily air-cooled using the breather air without using a cooling fan.

[0014]

FIG. 1 shows an embodiment of the present invention.

The parts described in the conventional example are assigned the same reference numerals and their explanation is omitted, and the parts related to the present invention will be mainly described.

The rotating shaft 1b has a coaxial gear 3b at one end and a centrifugal oil separator 4 adjacent to the gear 3b. The rotating shaft 1b has a hollow cylindrical shape, and the end of the hollow portion on the side of the gear 3b communicates with the oil separator. In addition, rotating shaft 1
gear 3b of b is inserted into Giabokkusu 10, and the gear 2 Gia bonds Giabokkusu 10.

The rotor 5 is coaxially mounted on the outside of the gear box 10 of the rotating shaft 1b. 9b is a bearing in the figure, 8b
Denotes an oil seal, and 11 denotes a female spline.

The casing 16a of the generator has a flange a at one end and a coaxial exhaust port d at the other end. A coil 6 facing the rotor 5 is coaxially housed in the casing 16a. Further, an air inlet hole d is formed on the flange side of the coil 6 of the casing 16a. Casing 1
A flange 6a is mounted on the gear box 10 coaxially with the rotation shaft 1b.

At this time, the end of the rotating shaft 1b on the rotor 5 side is chamfered, and the exhaust port d of the casing 16a is removed.
And a predetermined ejector clearance f. The inner diameter of the base of the exhaust port d is larger than the inner diameter of the end of the rotary shaft 1b by a predetermined amount to form an ejector. 14 in the figure
Is an exhaust duct.

In the above configuration, the gear 3 is driven by the gear 2 in the gear box 10, the rotation shaft 1 rotates,
Rotor 5 rotates and generator (20,000RPM, AC100W, AC200W)
Becomes

On the other hand, the breather air 12 containing oil passes through the centrifugal oil separator 4 and, after the oil is separated, passes through the rotary shaft 1b and is discharged from the exhaust port d to the exhaust duct 14.

The air passing through the rotating shaft 1b cools the rotor 5 from the inside, and when passing through the end of the rotating shaft 1b,
The air in the coil 5 is sucked and discharged by the ejector action from the ejector clearance f between the end and the inner surface of the base of the exhaust port d. Therefore, after air flows in from the air inlet d and cools the coil 6 and the rotor 5, the air is discharged from the outlet d through the exhaust duct 14 through the clearance f.

In the conventional method, since the generator and the oil separator are mounted on separate shafts, their respective spaces, rotating shafts, bearings, seals, and the like were required. As a result, the number of parts can be reduced and a compact design is possible.

In addition, the cooling fan can be omitted from the generator, and the number of parts and the weight can be reduced. In addition, there is a problem caused by erosion wear of the cooling fan observed in a helicopter engine used in an area where there is much dust. Was able to be eliminated.

A female spline 11 provided at the end of the rotary shaft 1b is provided with a so-called cranking pad for inserting a male spline from the outside and rotating a gas generator of the engine when inspecting the borescope of the engine. Is used as

[0026]

According to the present invention as described above,
Using the breather air, the generator unit was effectively cooled by air, and the cost reduction was achieved by downsizing.

[Brief description of the drawings]

FIG. 1 is a configuration sectional view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a generator section of a conventional example.

FIG. 3 is a sectional view of an oil separator portion of the conventional example.

[Explanation of symbols]

 1, 1a, 1b Rotary shaft 2 Gear 3, 3a, 3b Gear 4 Oil separator 5 Generator rotor 6 Generator coil 8, 8a, 8b Oil seal 9, 9a, 9b Bearing 10 Gear box 11 Female spline 12 Breather air 13 cooling fan 14 exhaust duct 15 cooling fan 16, 16a casing

Claims (1)

(57) [Claims] An end is rotatably inserted into an accessory drive gear box of a gas turbine engine, the end is gear- coupled, a centrifugal oil separator is provided at the end, and the oil is provided. A rotating shaft having a hollow communicating with the separator, a generator rotor coaxially mounted on the other end of the rotating shaft, and a generator coil opposed to the rotor coaxially inside, and having one end A generator casing having a coaxial exhaust port and the other end coaxially coupled to the rotating shaft on the accessory drive gear box, the generator casing having an air inlet hole on the gear box side of the coil. A generator for a gas turbine engine, wherein an inner surface of a base of the exhaust port has a clearance for an ejector with respect to an end of the rotating shaft.