JPH078823Y2 - Bearing cooling structure for gas turbine engine heat exchanger drive shaft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention mainly relates to a rotary heat storage type heat exchanger device for a gas turbine engine mounted on an automobile, and more specifically,
The present invention relates to the structure of the lubricating device for the bearing portion of the rotary regenerator drive shaft.

[Conventional technology]

A rotary heat storage type heat exchanger is generally driven by a spur gear. That is, a large gear is formed by attaching a gear surface to the cylindrical outer peripheral surface of a disk-shaped heat storage body having a certain thickness in the axial direction, and thereby a small gear with a very small outer diameter is meshed with the large gear. The gear is driven by an external drive source.

FIG. 3 shows an example of a conventional drive device. In the figure, the heat exchanger heat storage body 1 has one side of its outer periphery supported by a support 4, and a large gear (hereinafter referred to as a ring gear) 5 on the other side of its outer periphery. A small gear (hereinafter referred to as a pinion gear) 7 meshing with the large gear 5 is a drive shaft 8
The drive shaft 8 is attached to one end of the drive shaft 8 and is rotatably supported by a pair of bearings 10 positioned and arranged by a spacer 101 in the casing 2. The support 4 supports the outer periphery of the heat storage body 1 by the sliding surface of the carbon bearing piece. A bevel gear 102 is attached to the other end of the drive shaft 8, and the bevel gear 102 meshes with a bevel gear 104 attached to an input shaft 105 connected to a rotary drive source (not shown) to drive the rotation of the input shaft 105. It is transmitted to the shaft 8. Bearing 1 that supports the pinion gear 7 side of the bearing 10 and the input shaft 105
Dust seals 108 and 120 are arranged on the side of the rotary drive source of 07. Casing 103 has bevel gears 102, 104 and bearings 106, 10
An oil supply hole 109 for lubricating the oil and oil is provided. Grease 121 for lubricating the bearing 10 is filled between the pair of bearings 10 and between the bearing 10 and the dust seal 108. 2
2 is a compressed air flow path in the engine surrounded by the heat exchanger housing 25, through which high pressure compressed air flows.

Further, another example of the driving device is shown in FIG.
This is disclosed in the Japanese Utility Model Publication No. 56-84156, and although the model is different from the one described above, the heat storage body 1 is rotated by the drive shaft 8 via the pinion gear 7 and the ring gear 5 to form a pair of drive shafts 8. The basic structure supported by the bearing 10 is the same as the above example. 22 is a compressed air flow path through which high-pressure compressed air flows.

[Problems to be solved by the device]

The heat exchanger device of the conventional gas turbine engine described above has the following problems.

(1) The bearing 10 of the drive shaft 8 is always in a high temperature atmosphere, which causes the grease to deteriorate due to heat, lose its lubricity, and cause a so-called caulking phenomenon in which it deteriorates and hardens and sticks. descend.

(2) In the example shown in FIG. 3, the high pressure air from the compressed air passage 22 in the engine passes through the dust seal 108 and flows out toward the bearing 10, which causes the grease 121 to be scattered in a short time. Therefore, it is impossible to maintain a sufficient lubrication effect of the bearing 10 for a long period of time. Also in the example shown in FIG. 4, high-pressure air passes through the bearing 10 and leaks to the outside, so that the grease of the bearing 10 is scattered and the lubrication effect is reduced.

(3) In order to solve the problem described in the above item (1), even when a ceramic bearing with high lubricity at high temperature is used and a powdered solid lubricant such as molybdenum disulfide is also used, As described in the item (2), the solid lubricant is scattered by the flow of high-pressure air in a short time, and the lubricating effect is lost.

In view of the above-mentioned problems, the present invention aims to prevent the scattering of lubricating oil and the deterioration of durability due to caulking. The present invention aims to provide a lubrication mechanism which is supplied to the bearing and has a cooling effect on the bearing, whereby a coking phenomenon does not occur and a sufficient lubrication effect can be appropriately maintained for a long period of time.

[Means for Solving the Problems]

In order to solve the above problems, in the present invention, in order to rotationally drive a heat storage body of a rotary heat storage type heat exchanger, a large gear formed on an outer peripheral portion of the heat storage body and a small gear meshed with the large gear. A heat exchanger of the gas turbine engine, the heat exchanger housing having the small gear at one end thereof and being supported by a bearing to rotate and drive the heat storage body; A gas turbine characterized in that a bearing casing for accommodating a shaft bearing is formed separately with a gap communicating with the atmosphere interposed, and a bearing cooling louver that rotates with the drive shaft is provided in the gap. A bearing cooling structure for an engine heat exchanger drive shaft is provided.

[Action]

Among the high-temperature and high-pressure air that flows in the housing that houses the pinion, the air that has leaked from the housing flows out into the gap between the housing and the bearing casing, where the air is blown off by the bearing cooling louvers. It will not diffuse into the bearing casing. Further, the high temperature heat in the housing generated from the engine is not conducted to the bearing casing directly from the housing because the air gap portion is present, and the bearing casing is cooled by the air flow of the louver, so that the bearing and the dust seal are prevented. No heat deterioration or coking phenomenon occurs.

〔Example〕

FIG. 1 is a sectional view of a main part of a rotary regenerator drive according to an embodiment of the present invention. The heat storage body 1 of the rotary heat storage type heat exchanger is
A ring gear 5 having a tooth width equal to or less than half the full width is arranged on one side of the outer peripheral surface, and the other side adjacent to the ring gear 5 is rotatably supported by a support 4 held by a casing 2. The support 4 supports a point at which the outer circumference of the heat storage body 1 is equally divided into a plurality of parts by a sliding surface of a carbon bearing piece.

A pinion gear 7 meshing with the ring gear 5 is provided at one end of the drive shaft 8, and a bevel gear 13 is provided at the other end of the drive shaft 8.
It is fixed by nuts 6 and 9 screwed into the threaded portion of the.

A compressed air passage 22 is formed surrounded by the heat exchanger housing 25, the housing 24, the casing 2, etc., and high-pressure compressed air flows therein. A dust seal (also referred to as a ring seal) 18 is provided between the drive shaft 8 and the casing 2 to prevent the compressed air from leaking. A casing 3 is fitted to the other end of the housing 24, and a bearing 10 for supporting the drive shaft 8 and a dust seal 12 are arranged in the casing 3.

The bevel gear side of the other end of the drive shaft 8 is supported by a bearing 11, and the bearing 11 is arranged in a casing 15.
Is fastened to the housing 24 together with the casing 3 by bolts 14 inserted through the flange portion thereof, and a sealed chamber 32 is formed between the casing 15 and the casing 3, and the bearings 10 and 11 are housed therein.

The input shaft 16 orthogonal to the axis of the drive shaft 8 is supported by a pair of bearings 38 positioned by the spacers 17a and 17b in the casing 15, and a bevel gear 19 is screwed and fixed by a nut 20 at one end thereof. The heat storage body 1 is connected to a rotary drive source (not shown) and rotationally drives the heat storage body 1 from the bevel gear 19 through the bevel gear 13 and the drive shaft 8.

The casing 15 is provided with bevel gears 13, 19, bearings 10, 11, and a lubrication nozzle 21 for lubrication, a space between a pair of bearings 38 is filled with grease 23, and a rotary drive source side is provided. A casing 27 in which the dust seal 26 is arranged is fastened with a bolt 28.

Voids 29, 29a, 29b are provided between the housing 24, the casing 2 and the casing 3, and the space is open to the atmosphere. As shown in FIG. 2, a disc-shaped flange portion (hereinafter referred to as a disc) in which bent louvers 31 are equally arranged on the circumference is provided in a portion where the drive shaft 8 penetrates the void portion 29. A bush having 30 is fitted and rotates with the drive shaft 8 in the direction of the arrow, which acts as a blower to generate a flow of air in the gap 29, preventing retention of high temperature air and the drive shaft bearing. And cooling of the part.

With the above structure, the housings 24 and 25 surrounding the high temperature high pressure air passage 22 at the compressor outlet in the engine and the casing 2
And bearings 10 and 11 that respectively support the drive shaft 8 and the input shaft 16.
Since the sealed chamber 32 surrounded by the casings 3 and 15 in which the heat exchangers 38 and 38 are disposed is completely isolated, the air at the compressor outlet of high temperature and high pressure as in the conventional case is received by the bearings 10, 11, 38.
It does not happen that the lubricant leaks into the inside and scatters the lubricant to reduce the lubrication effect.

Further, the presence of the space 29 between the engine agent housings 24 and 25 and the bearing support casings 3 and 15 reduces heat transfer directly from the high temperature part on the engine side to the bearing part. By providing a disc 30 with a bent louver on the drive shaft passing through 29 and acting as a blower, air that has become hot due to radiant heat from the engine-side housings 24, 25 is prevented from staying in this void 29. In order to prevent the temperature rise of the bearing casings 3 and 15 in a thermally severe environment, the bearings are not exposed to a high temperature atmosphere,
It is possible to prevent deterioration of durability of the 38 and the dust seals 12, 18, 26. Further, the compressor outlet air that has passed through the dust seal 18 and leaked to the gap 29 can be forcibly exhausted by the disc 30, and thus the thermal deterioration of the dust seals 12 and 18 can be prevented.

According to the above configuration, the present embodiment does not require a special device for lubricating bearings, gears, etc. by jet lubrication, which was conventionally performed to prevent thermal deterioration of grease, caulking, and scattering of grease. According to the configuration of the example, the conventional lubricating method for the bearings, gears, etc. is sufficient for the lubricating device,
The lubrication system can be greatly simplified.

Further, if the bearing portion is made of a combination of a ceramic bearing having a high temperature lubricity and a powdered solid lubricant such as molybdenum disulfide, the high temperature durability can be further improved.

[Effect of device]

 The following effects can be obtained by implementing the present invention.

(1) Since the housing for accommodating the small gear and enclosing the compressed air flow path and the bearing casing for accommodating the bearing such as the drive shaft are completely separated from each other, compressed air leaks into the bearing, and the lubricant is used. Will not be scattered.

(2) By providing a gap between the housing and the casing and further providing a disc with a louver, heat transfer from the engine side to the bearing portion due to heat transfer or radiation is suppressed, and further cooled by the louver. Therefore, the bearing and the dust seal are prevented from being deteriorated due to heat and the caulking phenomenon.

(3) Due to the above (1) and (2), the bearing system does not require a special device such as a conventional jet oil supply, and the lubricating system is greatly simplified.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part of a rotary heat exchanger heat storage body driving device according to an embodiment of the present invention, FIG. 2 is a perspective view of a disc with a bent louver, and FIG. 3 is a rotary heat exchanger heat storage of a conventional example. FIG. 4 is a cross-sectional view of the main part of the body drive device, and FIG. 4 is a cross-sectional view of the main part of another conventional rotary heat exchanger heat storage body drive device. 1 …… Rotary heat exchanger heat storage body, 3,15 …… Bearing casing,
5 ... Large gear, 7 ... Small gear, 8 ... Drive shaft, 10, 11 ...
… Bearing, 24,25 …… Heat exchanger housing, 29 …… Void, 31 …… Bearing cooling louver.

Claims (1)

[Scope of utility model registration request] 1. A large gear formed on an outer peripheral portion of the heat storage body, a small gear meshing with the large gear, and a small gear arranged at one end for rotationally driving a heat storage body of a rotary heat storage type heat exchanger. In a heat exchanger of a gas turbine engine having a drive shaft which is supported by a bearing and rotationally drives the heat storage body, a heat exchanger housing for accommodating the pinion gear and a bearing casing for accommodating the bearing of the drive shaft. A bearing cooling structure for a gas turbine engine heat exchanger drive shaft, characterized in that the bearing cooling louver is formed separately with a space communicating with the atmosphere sandwiched therebetween and that the bearing cooling louver rotates together with the drive shaft. .