JP2000320494A - Support device for compressor variable wing - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable use of a brittle material for a variable blade of a compressor without causing a problem in strength. SOLUTION: A support cylinder 12 of a compressor casing 11 includes:
The variable wing supporting device is configured such that the spindle 9 of the variable wing 10 is inserted and rotatably supported, and the spindle 9 is rotated via the operation lever 16 to adjust the angle of the variable wing 10. A through hole 19 is provided at the base end 16a of the operation lever 16, and a locking pin 20 protruding from the circumferential surface of the through hole 19 is
The spindle 9 is engaged with an L-shaped groove 21 provided on the outer peripheral surface of the head. A fixing sleeve 22 is provided at the tip of the support cylinder 12.
Is screwed, and a fixing force is applied to the locking portion between the groove 21 and the locking pin 20 to support the spindle 9 on the operating lever 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable wing supporting device used to prevent unstable operation of a compressor mounted on a jet engine.

[0002]

2. Description of the Related Art As a jet engine, for example, a gas turbine engine such as a high bypass turbofan engine is used. FIG. 2 shows an outline of an example, in which a fan 1, a compressor 2, a combustor 3, and a turbine 4 are arranged in the turbine axis direction (indicated by an axis O) in order from the front end side.
The rotation of the fan 1 driven by the turbine 4 takes in air from the air inlet 5 and blows most of the air out of the bypass duct 6 to produce propulsion, while the remaining part of the compressor 2 is driven by the turbine 4. The fuel is burned in the combustor 3 by the compressed air, and the turbine 4 is driven by the high-speed combustion air flow.

[0003] In a gas turbine engine such as the high bypass turbofan engine described above, VS is required to prevent unstable operation (surge) of the compressor and to perform stable startup.
It is an essential requirement to provide a wing variable mechanism called a V (variable stator vane) mechanism.

As an example of a device for supporting the variable wing of the above-mentioned conventional VSV mechanism, as shown in FIGS. 3A and 3B, a head of a spindle (support shaft) 9 of a variable wing 10 of a compressor is shown. A parallel two-chamfered portion 7 is formed at a position facing the outer peripheral portion, and a small-diameter screw shaft 8 is protruded at the top of the head.
A support tube 12 provided to rise up to the outer peripheral surface of the compressor casing 11 is rotatably supported by being inserted through a bush 13, and is parallel to the head of the spindle 9 protruding from the support tube 12. At the position of the two chamfers 7,
A washer 14, a base end 16 a of an operation lever (vane lever) 16 having a leading end connected to a drive ring 15, and a lock washer 17 with a claw are sequentially fitted. Further, a lock nut 18 is fitted to the screw shaft 8 at the top of the spindle 9. By screwing and tightening, the pawl of the lock washer 17 is bent to prevent the locking nut 18 from being loosened, and the rotational displacement of the driving ring 15 in the circumferential direction is transmitted to the spindle 9 via the operating lever 16. In some cases, the angle of the variable wing 10 can be adjusted.

[0005]

However, recently,
The use of a high-strength material (brittle material) such as ceramic as a material for the spindle 9 of the compressor variable blade 10 has been studied to further reduce the weight, but in the case of the conventional variable blade support device described above. The screw 9 is screwed into the lock nut 18 to tighten the operation lever 1 to the spindle 9.
When the high specific strength material is used, the screw of the screw shaft 8 may not be able to be screwed (screw cut) even with a screw tightening torque less than the design torque. Be evoked.

Accordingly, the present invention is intended to adopt a high specific strength material for a spindle of a compressor variable blade as a configuration which does not cause the problem of thread breakage due to the tightening torque. It is.

[0007]

According to the present invention, in order to solve the above-mentioned problems, a variable blade spindle is inserted into a support cylinder of a compressor casing and supported rotatably, and the spindle is moved via an operation lever. In the compressor variable wing supporting device that is configured to be able to adjust the angle of the variable wing by rotating, in the center position of the base end of the operation lever,
By providing a through hole with a diameter corresponding to the outer diameter of the spindle,
A locking pin protrudes inward on the inner peripheral surface of the through hole,
And an L-shaped groove having a width and depth capable of fitting the locking pin is provided in an outer peripheral surface portion of the head of the spindle, and the locking pin is locked at an end of the groove. The base end of the operation lever can be fitted to the head of the spindle.Furthermore, a fixing sleeve is screwed on the distal end of the support cylinder, and the operation lever is pushed toward the top of the spindle by the fixing sleeve. The variable wing is supported by the operation lever by applying a fixing force to a locking portion between the groove end and the locking pin.

[0008] Since the spindle and the operating lever can be connected by engagement of the groove and the locking pin, and can be firmly fixed by tightening the fixing sleeve, there is no need to provide a screw on the spindle which may be broken by a tightening torque. Therefore, it is possible to use a high specific strength material.

Further, by providing a plurality of grooves provided on the spindle head in the circumferential direction and providing the locking pins at positions corresponding to the respective grooves, the load acting on the locking pins can be dispersed. It is more advantageous in strength.

[0010] Further, by providing a hooking portion which is deflected toward the top of the spindle at the end of the groove provided in the spindle head, the tightening torque by the fixing sleeve is not applied more than necessary. The relative displacement in the circumferential direction between the spindle and the operation lever can be reliably prevented.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 (a), 1 (b), 3 (c), and 4 (d) show an embodiment of the present invention. As shown in FIGS. The spindle 9 of the variable wing 10 is inserted into the cylinder 12 via a bush 13 so as to be rotatably supported, and the rotational displacement of the drive ring 15 in the circumferential direction is transmitted to the spindle 9 via the operation lever 16 to thereby rotate the variable wing 10. In the variable wing supporting device whose angle can be adjusted, the base end portion 16 of the operation lever 16 is provided.
A through hole 19 having a diameter corresponding to the outer diameter of the spindle 9 is provided at the center position of a, and a required amount of inward projection protrudes inward at a position in the circumferential direction of the inner peripheral surface of the through hole 19. Pin 2
0, and an L-shaped groove 21 having a width and depth capable of fitting the locking pin 20 is provided on the outer peripheral surface of the head of the spindle 9, and the locking pin is provided at the end of the groove 21. The operation lever 1 is attached to the head of the spindle 9 so as to be locked.
6 and a fixing sleeve 22 is screwed onto the distal end of the support tube 12. The fastening force of the fixing sleeve allows the terminal of the groove 21 and the locking pin 20 to be fixed. The operation lever 16 is fixed to the spindle 9 by applying a fixing force to the locking portion.

More specifically, the support cylinder 12 is formed to be longer than the bush 13 by a required amount, and has a female screw 12
a is engraved. On the other hand, the fixing sleeve 22 has a male screw 22a corresponding to the female screw 12a on the outer periphery, and a notched flange 22b used as a rotary operation part is provided at a tip end thereof. The support tube 12 is screwed to the distal end.
The spindle 9 extends perpendicularly at a position facing the outer peripheral surface of the head in the direction of the spindle axis O ₁ starting from the top of the head, and then extends in the circumferential direction over an angle range of 90 °. An L-shaped groove 21 is provided at the end of the groove 21 and a hook 21a is turned at the end of the groove.
Are connected continuously. Further, the operation lever 16 is provided with a through hole 19 at the center position of the base end portion 16a so as to be fitted into the outer periphery of the head portion of the spindle 9 as described above. In addition, a locking pin 20 for engaging with the groove 21 is protruded.

In FIGS. 1A and 2B, FIG.
The same parts as in (b) are denoted by the same reference numerals.

A specific assembling procedure for supporting the variable wing 10 will be described. First, in a state where the spindle 9 of the variable wing 10 is inserted through the support cylinder 12 of the compressor casing 11 via the bush 13, first, A fixing sleeve 22 is loosely mounted on the distal end of the spindle 9, and the outer male screw 22 a is screwed into the inner female screw 12 a on the inner peripheral end of the support cylinder 12, and the screw is fully screwed into the support cylinder 12 and lowered. To do.

Next, after the washer 14 is arranged on the distal end surface of the fixing sleeve 22, the locking pin 20 of the through hole 19 at the base end of the operation lever 16 is fitted into the groove 21 of the head of the spindle 9. The base end 16a of the operation lever 16 is fitted and dropped into the head of the spindle 9 in such a manner that the operation lever 16 is moved in the circumferential direction so that the locking pin 20 follows the shape of the groove 21. Rotate 90 °.

After that, the fixing sleeve 22 which has been fully screwed and lowered into the support cylinder 12 is turned to the opposite side and pressed against the rear surface of the base end portion 16a of the operation lever 16. As a result, the locking pin 20 is pushed into the hook 21a at the end of the groove 21, so that the operation lever 16 can be firmly fixed to the spindle 9 and the circumferential direction of the operation lever 16 and the spindle axis O _1. It is possible to prevent rattling of the direction.

In the variable wing supporting apparatus of the present invention assembled as described above, the engagement of the operating lever 16 to the spindle 9 is performed by the engagement between the groove 21 and the locking pin 20, and the spindle 9 is connected to the spindle 9. Is designed so that the fixing force is applied by the tightening force of the fixing sleeve 22 which does not directly interfere. Therefore, as in the case where the screw shaft 8 is used for the spindle 9 as shown in FIGS. There is no risk of threading due to threading, so there is no waste product caused by threading,
The cost can be greatly reduced, and the spindle 9
Since a screw is not provided in the product, a high specific strength material can be used, and performance can be improved by reducing the weight of the product.

In the above embodiment, the spindle 9
In order to surely prevent circumferential relative displacement between the control lever 16 and the operation lever 16, a case is shown in which a hook 21 a is provided at the end of the groove 21. However, the relative displacement is prevented by the tightening torque of the fixing sleeve 22. Therefore, the hook 21a is not indispensable, and in the embodiment, in order to disperse the load acting on the locking pin 20 by the turning power of the operation lever 16, the groove 21 and the engaging portion 21a are disengaged. Although the case where two combinations of the fixing pins 20 are provided in the circumferential direction is shown, it is needless to say that the present invention is not limited to this, and that various changes can be made without departing from the scope of the present invention.

[0020]

As described above, according to the compressor variable wing supporting apparatus of the present invention, the variable wing spindle is inserted into the support cylinder of the compressor casing to be rotatably supported, and the spindle is operated. In the compressor variable wing supporting device, wherein the angle of the variable wing can be adjusted by rotating via a lever, the center of the operation lever at the base end portion has a diameter corresponding to the outer diameter of the spindle. A through-hole is provided, a locking pin protrudes inward from an inner peripheral surface of the through-hole, and a width and a depth that allow the locking pin to be fitted into an outer peripheral surface of the head of the spindle. An L-shaped groove is provided, and the locking pin is locked at the end of the groove so that the base end of the operation lever can be fitted to the head of the spindle. The fixing sleeve is screwed on the tip of Since the operating lever is pushed toward the top of the spindle by the fixing sleeve to apply a fixing force to the locking portion between the end of the groove and the locking pin, the variable wing is supported by the operating lever. The operating lever can be connected to the spindle without causing the risk of thread breakage as in the device, which makes it possible to use high-strength materials for the variable wing and the spindle, thereby reducing the weight and improving the performance of the product. Can be planned,
In addition, since there is no waste product due to thread breakage, it is advantageous in terms of cost.Furthermore, a plurality of grooves are provided in the circumferential direction, and a locking pin is provided at a position corresponding to each of the grooves. By doing so, it is possible to disperse the load acting on the locking pin, which is more advantageous in terms of strength, and furthermore, to provide a configuration in which a hook portion which is deflected toward the top of the spindle is provided at the end of the groove. Accordingly, excellent effects such as the relative displacement of the spindle and the operation lever in the circumferential direction can be reliably prevented without increasing the tightening torque of the fixing sleeve more than necessary.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a compressor variable blade supporting device according to the present invention, in which (A) is a cut side view and (B) is a plan view.

FIG. 2 is a schematic diagram illustrating an example of a jet engine.

FIG. 3 shows an example of a conventional variable wing supporting device used in a compressor, where (A) is a cut side view and (B) is a plan view.

[Explanation of symbols]

 Reference Signs List 9 spindle 10 variable blade 11 compressor casing 12 support cylinder 16 operating lever 16a base end 19 through hole 20 locking pin 21 groove 21a hooking portion 22 fixing sleeve

Claims (3)

[Claims] 1. A variable wing spindle is inserted into a support cylinder of a compressor casing and rotatably supported, and the spindle is rotated via an operation lever so that the angle of the variable wing can be adjusted. In a compressor variable wing supporting device, at the center of the base end of the operating lever,
By providing a through hole with a diameter corresponding to the outer diameter of the spindle,
A locking pin protrudes inward on the inner peripheral surface of the through hole,
And an L-shaped groove having a width and depth capable of fitting the locking pin is provided in an outer peripheral surface portion of the head of the spindle, and the locking pin is locked at an end of the groove. The base end of the operation lever can be fitted to the head of the spindle.Furthermore, a fixing sleeve is screwed on the distal end of the support cylinder, and the operation lever is pushed toward the top of the spindle by the fixing sleeve. A compressor variable blade supporting device, characterized in that the variable blade is supported by an operation lever by applying a fixing force to a locking portion between the groove end and the locking pin. 2. The compressor variable wing supporting device according to claim 1, wherein a plurality of grooves provided on the spindle head in the circumferential direction are provided, and locking pins are provided at positions corresponding to the respective grooves. 3. The variable compressor blade supporting device according to claim 1, further comprising a hook portion which is deflected toward the top of the spindle at an end of a groove provided in the spindle head.