CN115045865A

CN115045865A - Stator blade adjusting device and compressor comprising same

Info

Publication number: CN115045865A
Application number: CN202110257485.2A
Authority: CN
Inventors: 江奔; 陆晓锋; 刘洋
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2021-03-09
Filing date: 2021-03-09
Publication date: 2022-09-13

Abstract

The invention discloses a regulating device of stator blades and a gas compressor comprising the same, wherein the regulating device is used for regulating the angle of the stator blades in a gas compressor casing, the regulating device comprises a linkage ring, a worm wheel and a linkage assembly, the linkage ring is sleeved on the outer peripheral side of the gas compressor casing and can rotate relative to the gas compressor casing, and the linkage ring is provided with a plurality of tooth structures which can be meshed with the gear for transmission; the worm wheel is coaxially fixed on the rotating shaft of the stator blade and is positioned on the outer side of the compressor casing; the linkage assembly comprises a gear and a worm, the gear and the worm are coaxially arranged and can synchronously rotate, the gear is in meshed transmission connection with the linkage ring, and the worm is in meshed transmission connection with the worm wheel. The stator blade adjusting device adjusts the angle of the stator blade, so that the stator blade can more conveniently meet the performance of the compressor.

Description

Stator blade adjusting device and compressor comprising same

Technical Field

The invention relates to the field of aero-engines, in particular to a stator blade adjusting device and a compressor comprising the same.

Background

The adjusting device of the adjustable stator blade of the aero-engine is a group of spatial link mechanisms positioned on a casing of an engine compressor, and is used for adjusting the rotation rule of the adjustable stator blade of the compressor to enlarge the working range of the compressor, improve the surge phenomenon of the engine and further improve the performance of the aero-engine.

A conventional stator blade adjusting device is shown in fig. 1 to 3, and mainly includes a link ring 2, an actuating mechanism 3, a torsion bar 4, a connecting rod 5, and a rocker arm 6. Actuating mechanism 3 has extensible interior pole, and interior pole accessible hydraulic pressure, mode such as electronic promote torsion bar 4 rotatory, and then drive link 2 through connecting rod 5 and rotate, will actuate the linear motion of mechanism 3 and turn into the axial translation and the circumferential direction of link 2, and the rocking arm 6 that finally makes one end install in link 2 drives adjustable stator blade 7 and reaches the required angle of regulation round self central line rotation. Each stator blade 7 corresponds to one rocker arm 6, and stator blade 7 and rocker arm 6 are through the cooperation of dysmorphism hole and compress tightly with gland nut 8, and because link ring 2 will carry out axial translation and circumferential direction rotation simultaneously, need be connected through joint bearing between rocker arm 6 and the link ring 2.

The stator blade adjusting device can realize the joint adjustment of multiple stages of stator blades through the torsion bar 4. However, the above-described adjusting device is liable to cause the following problems when adjusting the stator vane 7:

(1) when the torque is large, the rocker arm 6 is easy to deform, so that the adjustment precision of the stator blade 7 is influenced, and the performance of the compressor is influenced;

(2) when the linkage ring 2 rotates, as the joint of the rocker arm 6 and the linkage ring 2 is far away from the rotating axis of the stator blade 7, the stator blade 7 rotates by the same angle, and a larger stroke of the linkage ring 2 is needed, namely, the actuating mechanism 3 also has a larger stroke, so that the requirement on the actuating mechanism 3 is higher, and a larger space outside the casing is occupied;

(3) the linkage ring 2 needs to rotate in the circumferential direction and move axially, so that a large space outside the casing is occupied, and the angular displacement of the linkage ring 2 and the angular displacement of the stator blade 7 have no corresponding relation, so that the adjusting precision of the stator blade 7 cannot be guaranteed.

In summary, the conventional stator vane adjusting device has many problems, which affect the working performance of the aircraft engine, and therefore, a new stator vane adjusting device needs to be designed to avoid the problems.

Disclosure of Invention

The invention aims to solve the technical problem that the existing adjusting mechanism for the adjustable stator blade occupies a large space outside a casing and cannot ensure the adjusting precision of the stator blade, and provides an adjusting device for the stator blade and a gas compressor comprising the same.

The invention solves the technical problems through the following technical scheme:

the invention provides a stator blade adjusting device, which is used for adjusting the angle of a stator blade in a casing of an air compressor, and comprises:

the linkage ring is sleeved on the outer peripheral side of the compressor casing and can rotate relative to the compressor casing, and a plurality of tooth structures capable of being in meshing transmission with the gear are arranged on the linkage ring;

the worm wheel is coaxially fixed on the rotating shaft of the stator blade and is positioned on the outer side of the compressor casing;

the linkage assembly comprises a gear and a worm, the gear and the worm are coaxially arranged and can synchronously rotate, the gear is in meshed transmission connection with the linkage ring, and the worm is in meshed transmission connection with the worm wheel.

In the scheme, the angle of the stator blade is adjusted by adopting the adjusting device, the link ring only does circumferential motion and does not do axial motion, so that more space outside a casing of the compressor is not occupied, and the compactness of the engine structure is improved; the linkage assembly in the form of combining the gear and the worm cannot generate torsional deformation, so that the control accuracy in a working range can be ensured, the error is stable and small, and the adjusting accuracy of the stator blade is ensured; the stator blades are controlled to rotate by the linkage ring in a gear transmission mode, so that the angular displacement of the linkage ring rotation and the angular displacement of the stator blades form a linear relation, the regulation rule of the stator blades is conveniently regulated by regulating the transmission ratio, and the stator blades can more conveniently meet the performance of the gas compressor during angle regulation.

Preferably, the adjusting device further comprises a support seat fixed on the compressor casing between the link ring and the worm wheel;

the linkage assembly is further provided with a rotating part, the gear and the worm are coaxially fixed at two ends of the rotating part, and the rotating part is axially and rotatably installed on the supporting seat.

In this scheme, provide support and rotation for the linkage subassembly through the supporting seat, the gear and the worm at the both ends of the linkage subassembly of being convenient for are connected with the worm wheel transmission on linkage ring and the stator blade.

Preferably, a limiting part is arranged on the supporting seat and used for limiting the rotating part to move axially.

In this scheme, take place axial displacement in order to avoid the linkage subassembly at the during operation through spacing portion restriction rotation portion on the supporting seat, take place to break away from between gear and the link ring or take place to break away from between worm and the worm wheel, influence the regulation of stator blade.

Preferably, the support seat includes a seat body and a cover body, the seat body and the cover body are detachably mounted, and the seat body and the cover body form a rotation space of the rotation portion.

In this scheme, the supporting seat adopts above-mentioned structure, the installation linkage subassembly of being convenient for.

Preferably, the adjusting device further comprises a bearing, the bearing is arranged on the supporting seat, and the rotating part is mounted on the supporting seat through the bearing.

In this scheme, through setting up the bearing, not only can play the effect of supporting and its axial displacement of restriction to the rotation portion of linkage subassembly, still avoid rotation portion direct and supporting seat production friction to lead to wearing and tearing, influence the transmission effect and the life of linkage subassembly.

Preferably, the tooth structures on the linkage ring are circumferentially distributed along the outer peripheral surface of the linkage ring.

In this scheme, the link ring adopts above-mentioned structure, convenient processing and with gear fit transmission.

Preferably, the adjusting device further comprises a driving mechanism for driving the linkage ring to rotate circumferentially on the compressor casing.

In the scheme, only the linkage ring is circumferentially rotated through the driving mechanism.

Preferably, a plurality of mounting holes distributed along the circumferential direction are formed in the compressor casing, and a rotating shaft of an upper journal of each stator blade correspondingly penetrates through one of the mounting holes;

the compressor casing is also provided with a plurality of linkage assemblies distributed along the circumferential direction, and each linkage assembly corresponds to one stator blade.

In this scheme, adopt above-mentioned structure, can carry out angle modulation by a plurality of stator blades of synchro control siblings.

Preferably, the gear is a spur gear.

The invention also provides a compressor, which comprises the stator blade adjusting device.

On the basis of the common general knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.

The positive progress effects of the invention are as follows: the adjusting device for the stator blades adjusts the angles of the stator blades, the linkage ring only does circumferential motion and does not do axial motion, more space outside a casing of the gas compressor is not occupied, and the compactness of the structure of the engine is improved; the linkage assembly in the form of combining the gear and the worm cannot generate torsional deformation, so that the control accuracy in a working range can be ensured, the error is stable and small, and the adjusting accuracy of the stator blade is ensured; the linkage ring controls the stator blades to rotate in a gear transmission mode, so that the angular displacement of the linkage ring rotation and the angular displacement of the stator blades form a linear relation, the regulation rule of the stator blades is conveniently regulated by regulating the transmission ratio, and the stator blades can more conveniently meet the performance of the gas compressor during angle regulation.

Drawings

Fig. 1 is a schematic view of a driving mechanism of a link ring in an adjusting device of a stator vane in the prior art.

Fig. 2 is a schematic view of a connecting structure of a rocker arm, a linkage ring and a stator blade in the prior art.

FIG. 3 is a partial cross-sectional view of a prior art rocker arm at the junction with a link ring and stator vanes.

Fig. 4 is a schematic view of the structure of the stator vane and the linkage mechanism in the adjusting device of the stator vane according to the preferred embodiment of the present invention.

FIG. 5 is a schematic view of a supporting base according to a preferred embodiment of the present invention.

FIG. 6 is a schematic structural diagram of a linkage assembly according to a preferred embodiment of the present invention.

Description of reference numerals:

compressor casing 1

Mounting hole 101

Link ring 2

Actuating mechanism 3

Torsion bar 4

Pull rod 5

Rocker arm 6

Stator blade 7

Compression nut 8

Link ring 20

Linkage assembly 30

Gear 31

Worm 32

Rotating part 33

Worm wheel 40

Support seat 50

Base body 51

Cover 52

Detailed Description

The invention will be more clearly and completely described below by way of examples and with reference to the accompanying drawings, without thereby limiting the scope of the invention to these examples.

As shown in fig. 4 to 6, the adjusting device for the stator blade 7 disclosed in the present embodiment is provided. The adjusting device of the stator blade 7 is used for adjusting the angle of the stator blade 7 in the compressor casing 1, and comprises a linkage ring 20, a worm wheel 40 and a linkage assembly 30. The linkage ring 20 is sleeved on the outer peripheral side of the compressor casing 1 and can rotate relative to the compressor casing 1, and the linkage ring 20 is provided with a plurality of tooth structures which can be meshed with the gear 31 for transmission. The worm wheel 40 is coaxially fixed on the rotating shaft of the stator blade 7, and the worm wheel 40 is positioned at the outer side of the compressor casing 1. The linkage assembly 30 comprises a gear 31 and a worm 32, the gear 31 and the worm 32 are coaxially arranged and can synchronously rotate, the gear 31 is in meshing transmission connection with the linkage ring 20, and the worm 32 is in meshing transmission connection with the worm wheel 40.

In the scheme, the angle of the stator blade 7 is adjusted by adopting the adjusting device, the link ring 20 only does circumferential motion without axial motion, so that more space outside the casing 1 of the compressor is not occupied, and the compactness of the engine structure is improved; the linkage assembly 30 in the form of the combination of the gear 31 and the worm 32 cannot be subjected to torsional deformation, so that the control within a working range can be ensured to be accurate, the error is stable and small, and the adjusting precision of the stator blade 7 is ensured.

When the stator blade 7 is angularly adjusted, the rotational displacement of the stator blade 7 and the rotational displacement of the link ring 20 satisfy the following relationship: θ ═ k ₁ *k ₂ )*θ ₁ (ii) a Wherein: theta is the rotational displacement of the stator blade 7, theta ₁ For a circumferential rotational displacement, k, of the link ring 20 ₁ The gear ratio, k, of the gear 31 to the link ring 20 ₂ The gear ratio of the worm 32 to the worm gear 40. The linkage ring 20 controls the stator blade 7 to rotate in a gear 31 transmission mode, so that the rotary angular displacement of the stator blade 7 is linearly related to the rotary angular displacement of the linkage ring 20, the angle adjusting rule of the stator blade 7 is changed by changing the transmission ratio according to the relation, and the stator blade 7 can meet the performance of the air compressor more conveniently during angle adjustment.

As shown in fig. 4 and 5, the adjusting device further includes a support seat 50, and the support seat 50 is fixed on the compressor casing 1 between the link ring 20 and the worm wheel 40. The linkage assembly 30 further has a rotating portion 33, the gear 31 and the worm 32 are coaxially fixed to both ends of the rotating portion 33, and the rotating portion 33 is rotatably mounted on the support base 50 in the axial direction. In this embodiment, the support seat 50 provides support and rotation for the linkage assembly 30, so that the gears 31 and the worms 32 at the two ends of the linkage assembly 30 are in transmission connection with the linkage ring 20 and the worm wheel 40 on the stator blade 7.

In the present embodiment, the supporting seat 50 is provided with a limiting portion (not shown) for limiting the axial movement of the rotating portion 33. The axial displacement of the rotating part 33 is limited by the limiting part on the supporting seat 50 to prevent the gear 31 and the link ring 20 or the worm 32 and the worm wheel 40 from being separated to influence the adjustment of the stator blade 7 when the linkage assembly 30 works.

The support base 50 includes a base body 51 and a cover body 52, the base body 51 and the cover body 52 are detachably mounted, and the base body 51 and the cover body 52 form a rotation space of the rotation portion 33. The supporting seat 50 is of a detachable structure, so that the linkage assembly 30 can be conveniently installed. In the present embodiment, as shown in fig. 5, opposite sides of the seat body 51 and the cover body 52 are respectively provided with a groove with a semicircular structure, and when the seat body 51 and the cover body 52 are correspondingly installed, a complete cylindrical cavity is formed, and the cylindrical cavity is a rotating space of the rotating part 33 of the linkage assembly 30. At both ends of the cylindrical cavity, there are radially inwardly extending ring structures, which are the limiting portions on the support seat 50. The ring-like structure is arranged concentrically with the cylindrical cavity, and the rotating portion 33 is mounted in the rotating space.

Of course, in this embodiment, the adjusting device further includes a bearing (not shown), the bearing is disposed on the supporting seat 50, and the rotating portion 33 is mounted on the supporting seat 50 through the bearing. Through setting up the bearing, not only can play the effect of supporting and its axial displacement of restriction to the rotation portion 33 of linkage assembly 30, still avoid rotation portion 33 directly to produce the friction with supporting seat 50 and lead to wearing and tearing, influence linkage assembly 30's transmission effect and life.

In this embodiment, since the bearing is provided, the outer circumferential surface of the outer ring of the bearing is fitted to the inner circumferential surface of the cylindrical cavity, the inner ring of the bearing is fixedly mounted to the rotating portion 33 and rotates synchronously, and both sides of the bearing are abutted to the inner side surfaces of the corresponding ring structures to restrict the movement of the bearing in the axial direction.

In other embodiments, the outer peripheral surface of the rotating portion 33 can also be directly and rotatably engaged with the inner surface of the cylindrical cavity of the support seat 50. However, this type of fitting causes wear of the rotating surfaces over time, which affects the accuracy of adjustment of the stator vanes 7.

The tooth structures on the link ring 20 are circumferentially distributed along the outer peripheral surface of the link ring 20.

As shown in fig. 4, in the present embodiment, the outer peripheral surface of the interlocking ring 20 is uniformly provided with a tooth structure engaged with the gear 31. The teeth of the tooth structure are straight teeth and are parallel to the axis of the link ring 20, and the link ring 20 adopting the structure is convenient to process and is matched with the gear 31 for transmission.

In other embodiments, the teeth of the tooth structure may be helical teeth or other structures, and the corresponding gear 31 on the linkage assembly 30 needs to be correspondingly changed to fit with the helical teeth.

In other embodiments, the tooth structure on the link ring 20 may also be provided on the inner circumferential surface of the link ring 20. But not to affect the rotation of the link ring 20 itself. The specific structure will not be described herein.

The adjusting device further comprises a driving mechanism for driving the coupling ring 20 to rotate circumferentially on the compressor casing 1.

In the present embodiment, the drive mechanism employs a drive structure in the related art. As shown in fig. 1, the driving mechanism includes an actuating mechanism 3, a torsion bar 4, and a connecting rod, wherein the actuating mechanism 3 has an extendable inner rod, and the inner rod can push the torsion bar 4 to rotate in a hydraulic or electric manner, so as to drive the link ring 20 to rotate through the connecting rod. In this embodiment, the linear motion of the actuating mechanism 3 is only converted into the circumferential rotation of the link ring 20, and the axial motion is not generated, so as to finally drive the stator blade 7 to rotate around the center line thereof to achieve the angle required by adjustment.

The compressor casing 1 is provided with a plurality of mounting holes 101 distributed along the circumferential direction, and a rotating shaft of an upper journal of each stator blade 7 correspondingly penetrates through one mounting hole 101. The compressor casing 1 is further provided with a plurality of linkage assemblies 30 distributed along the circumferential direction, and each linkage assembly 30 corresponds to one stator blade 7. By adopting the structure, a plurality of stator blades 7 at the same stage can be synchronously controlled to carry out angle adjustment.

In the embodiment, a plurality of connecting rods are arranged in the length direction of the torsion bar 4, and the plurality of linkage rings 20 are driven to synchronously rotate, so that the plurality of stator blades 7 of different stages are synchronously controlled to perform angle adjustment.

In addition, the rotating angles of the stator blades 7 of different stages can be adjusted by changing the transmission ratio between the linkage assembly 30 corresponding to the linkage ring 20 and the stator blades 7 at different positions.

In other embodiments, the circumferential rotation of the link ring 20 can be driven by other driving mechanisms commonly used in the mechanical field, and will not be described herein.

The embodiment also discloses a compressor which adopts the regulating device of the stator blade. The stator blade adjusting device is arranged on a compressor casing of the high-pressure compressor and used for adjusting the rotating angle of the stator blades of the first stages in the compressor casing, changing the incoming flow attack angle of the movable blades in the compressor casing, improving the engine surge phenomenon, expanding the working range of the compressor and further improving the performance of the aircraft engine.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes or modifications to these embodiments may be made by those skilled in the art without departing from the principle and spirit of this invention, and these changes and modifications are within the scope of this invention.

Claims

1. An adjusting device for stator blades for adjusting the angle of stator blades in a compressor casing, the adjusting device comprising:

2. The stator vane adjustment assembly of claim 1 further comprising a support base secured to the compressor case between the link ring and the worm gear;

3. The stator vane adjusting apparatus as claimed in claim 2, wherein the supporting seat is provided with a limiting portion for limiting the axial movement of the rotating portion.

4. The adjusting apparatus for stator vanes according to claim 2, wherein the supporting base includes a base body and a cover body, the base body and the cover body being detachably mounted, the base body and the cover body forming a rotation space of the rotating portion.

5. The stator vane adjusting apparatus as claimed in claim 2, further comprising a bearing provided on the support base, the rotating portion being mounted on the support base through the bearing.

6. The stator vane adjustment assembly of claim 1 wherein the tooth structure on the link ring is circumferentially distributed along the outer peripheral surface of the link ring.

7. The stator vane adjustment assembly of claim 1 further comprising a drive mechanism for driving the link ring in circumferential rotation on the compressor case.

8. The stator blade adjusting device of claim 1, wherein the compressor casing is provided with a plurality of circumferentially distributed mounting holes, and a rotating shaft of an upper journal of each stator blade correspondingly passes through one of the mounting holes;

9. The stator vane adjustment device of claim 1 wherein the gear is a spur gear.

10. A compressor, characterized in that it comprises a regulating device of stator blades as claimed in any one of claims 1 to 9.