Compressor stator blade adjustment mechanism and compressor

Abstract

The present disclosure relates to a compressor vane adjustment mechanism and a compressor. The compressor vane adjustment mechanism includes: a linkage ring configured to be disposed on a casing and capable of circumferential rotation; and a rocker arm configured to connect a shaft portion of a stator blade and the linkage ring. The rocker arm is movably connected to the shaft portion of the stator blade along its length. By movably connecting the rocker arm to the shaft portion of the stator blade along its length, the connection between the rocker arm and the stator blade journal increases the degree of freedom in the length direction, effectively reducing the possibility of jamming during movement, making rotational adjustment of the vane more convenient, and improving the reliability and stability of the vane adjustment.

Description

Technical Field

[0001] The present disclosure relates to a compressor stator blade adjustment mechanism and a compressor. Background Art

[0002] The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.

[0003] As engine performance improves, compressor operating conditions approach surge limits. The stator blades in the first few stages of the compressor are typically designed with adjustable angles to achieve a greater surge margin. To reduce compressor mass and control variables, multi-stage blade adjustment mechanisms are typically designed as a coordinated mechanism where a single active element simultaneously drives multiple rows of blades to adjust at varying angles. Traditional aircraft engine compressor stator blade adjustment mechanisms primarily consist of an actuator, connecting rod, linkage ring, and rocker arm, and can be broadly categorized as either crank-connecting rod or torsion bar.

[0004] The crank-connecting rod type joint adjustment mechanism primarily uses an actuating cylinder to drive the movement of the actuating arm, thereby driving the rotation of the multi-stage parallel cranks hinged by the connecting rod. The rotation of the crank drives the corresponding driving arm, actuating the corresponding linkage ring. The linkage ring then drives the rocking arm to swing around the blade's rotation axis, ultimately achieving the purpose of driving the blade. The torsion bar type joint adjustment mechanism primarily uses an actuating cylinder to drive the movement of the actuating arm, thereby driving the rotation of the torsion bar. Each stage of the linkage ring is connected to the torsion bar by a connecting rod. The rotation of the right torsion bar drives each stage of the linkage ring to complete the joint adjustment process. The main feature of the torsion bar type adjustment mechanism is that it is relatively simple in structure, but requires more space than the crank-connecting rod type.

[0005] Due to the rocker arm's characteristic rotation around the stator blade axis, the linkage rings of the two existing control actuators require axial displacement in addition to circumferential rotation around the casing. To achieve this, multiple stop screws are installed around the casing to ensure the circumferential rotation accuracy of the linkage rings. In an ideal world, the stop screws do not contact the casing, leaving a certain gap, and the linkage ring is suspended from the casing's periphery solely by the connecting rod and rocker arm. However, in actual operation, uneven force distribution causes uneven deformation of the linkage ring, resulting in misalignment with the casing during movement. The stop screws often contact and retain the position on one side of the casing. This introduces certain stator blade alignment errors, resulting in friction and drag. The multiple degrees of freedom in multiple spatial dimensions also introduce certain inaccuracies in the alignment of the linkage rings at each stage. These factors affect the accuracy of the control mechanism, leading to errors in the angle adjustment patterns of each stage and inconsistent angle adjustment of blades at the same stage, thus affecting engine performance.

[0006] In addition, the connection between the rocker arm and the stator blade journal is a single-degree-of-freedom connection, which increases the possibility of jamming in motion transmission. Summary of the Invention

[0007] A technical problem to be solved by the present disclosure is to provide a compressor stator blade adjustment mechanism and a compressor, which can effectively improve the reliability and stability of the stator blade adjustment.

[0008] According to some embodiments of the present disclosure, a compressor stator blade adjustment mechanism is provided, comprising: a linkage ring, configured to be arranged on a casing and capable of circumferential rotation; and a rocker arm, configured to connect the shaft portion of the stator blade and the linkage ring; wherein the rocker arm is movably connected to the shaft portion of the stator blade in its length direction.

[0009] In some embodiments, a first end of the rocker arm is hinged to the linkage ring, and a second end of the rocker arm is movably hinged to the shaft portion of the stator blade in a length direction thereof.

[0010] In some embodiments, a screw is also included, the second end of the rocker arm is configured as a fork arm, a notch is formed in the middle of the fork arm, and a slide groove is formed on both sides of the fork arm, the shaft of the stator blade is arranged in the notch, and the screw is arranged in the slide groove and passes through the shaft of the stator blade to enable the second end of the rocker arm to be movably hinged to the shaft of the stator blade in its length direction.

[0011] In some embodiments, the opening direction of the notch is perpendicular to the slotting direction of the sliding groove.

[0012] In some embodiments, the length direction of the notch and the length direction of the slide groove are both consistent with the length direction of the rocker arm.

[0013] In some embodiments, a side of the fork arm away from the linkage ring is configured as an open structure.

[0014] In some embodiments, a stator blade is further included, and flat surfaces matching the recess are formed on both sides of the shaft of the stator blade.

[0015] In some embodiments, there is a preset gap between the screw head and the nut of the screw and the fork arm.

[0016] In some embodiments, the linkage ring is constrained in its axial freedom on the casing.

[0017] In some embodiments, a casing is further included, a plurality of rollers are provided on the inner ring of the linkage ring, an annular slide is provided on the outer wall surface of the casing, and the plurality of rollers are arranged to roll in the annular slide.

[0018] According to some embodiments of the present disclosure, a compressor is provided, comprising the aforementioned compressor stator blade adjustment mechanism.

[0019] In the technical solution disclosed in the present invention, by movably connecting the rocker arm to the shaft of the stator blade in its length direction, the connection between the rocker arm and the stator blade journal increases the degree of freedom in the length direction, effectively reducing the possibility of jamming during movement, making the rotational adjustment of the stator blade more convenient, and improving the reliability and stability of the stator blade adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 and Figure 2 They are schematic structural diagrams of rocker arms in some embodiments of the compressor stator blade adjustment mechanism disclosed herein from different perspectives;

[0022] Figure 3 Schematic diagram of the structure of screws in some embodiments of the compressor stator blade adjustment mechanism disclosed herein;

[0023] Figures 4 to 6 Schematic diagrams of the structure of the connection between the rocker arm and the shaft of the stator blade in some embodiments of the compressor stator blade adjustment mechanism disclosed herein, viewed from different angles;

[0024] Figure 7 Schematic diagrams of the structures of some embodiments of the compressor stator blade adjustment mechanism disclosed herein;

[0025] Figure 8 It is a structural schematic diagram of the linkage ring in some embodiments of the compressor stator blade adjustment mechanism disclosed in the present invention.

[0026] Description of Reference Numerals

[0027] 1. Rocker arm; 2. Screw; 3. Stator blade; 4. Pin; 5. Linkage ring; 6. Roller; 7. Casing; 8. Ball bearing; 11. Notch; 12. Pin hole; 13. Slide groove; 71. Annular slide. DETAILED DESCRIPTION

[0028] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure, its application, or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments herein. These embodiments are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and numerical values set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0029] The terms "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The terms "include" or "comprises" and similar terms mean that the elements before the term include the elements listed after the term, and do not exclude the possibility of also including other elements. The terms "upper", "lower", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] In the present disclosure, when a specific device is described as being located between a first device and a second device, an intervening device may or may not be present between the specific device and the first device or the second device. When a specific device is described as being connected to another device, the specific device may be directly connected to the other device without an intervening device, or may be not directly connected to the other device but with an intervening device.

[0031] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined as such herein.

[0032] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0033] like Figures 1 to 8 As shown, a compressor stator blade adjustment mechanism provided according to some embodiments of the present disclosure includes: a linkage ring 5 and a rocker arm 1, wherein the linkage ring 5 is configured to be set on the casing 7 and can rotate circumferentially; the rocker arm 1 is configured to connect the shaft of the stator blade 3 and the linkage ring 5; the rocker arm 1 is movably connected to the shaft of the stator blade 3 in its length direction.

[0034] In this exemplary embodiment, by movably connecting the rocker arm 1 to the shaft of the stator blade 3 along its length, the connection between the rocker arm 1 and the journal of the stator blade 3 increases the degree of freedom in the length direction, effectively reducing the possibility of jamming during movement, making rotational adjustment of the stator blade more convenient and improving the reliability and stability of stator blade adjustment. In other embodiments, the compressor stator blade adjustment mechanism further includes a tie rod (not shown), one end of which is configured to receive rotational motion and the other end of which is connected to the linkage ring 5 to drive the linkage ring 5 to rotate.

[0035] Combine Figures 4 to 7 As shown, in some embodiments, the first end of the rocker arm 1 is hinged to the linkage ring 5, and the second end is movably hinged to the shaft of the stator blade 3 in its length direction. In this way, the connection between the rocker arm and the stator blade journal increases two degrees of freedom compared with the traditional connection method, that is, a kinematic pair with one directional displacement degree of freedom and one directional rotation degree of freedom is formed, which reduces the possibility of jamming during movement and has higher feasibility.

[0036] How to realize that the second end of the rocker arm can be movably hinged to the shaft of the stator blade 3 in its length direction, combined with Figures 3 to 7 As shown, in some embodiments, the compressor stator blade adjustment mechanism also includes a screw 2, the second end of the rocker arm 1 is configured as a fork arm, a recess 11 is formed in the middle of the fork arm, and slide grooves 13 are formed on both sides of the fork arm, the shaft portion of the stator blade 3 is arranged in the recess 11, and the screw 2 is arranged in the slide groove 13 and passes through the shaft portion of the stator blade 3, so that the second end of the rocker arm 1 can be movably hinged to the shaft portion of the stator blade 3 in its length direction.

[0037] In this embodiment, by setting the recess 11 and the slide 13, the shaft of the stator blade 3 can be set in the recess 11, and the screw 2 passes through the shaft of the stator blade 3 and can be relatively slidably set in the slide 13. On the one hand, the second end of the rocker arm 1 is hinged to the shaft of the stator blade 3 through the screw 2, and the fork arm can also rotate slightly around the screw 2 to release a degree of rotational freedom. The rocker arm 1 can swing up and down relative to the stator blade 3, reducing the occurrence of sticking; on the other hand, the slide 13 of the rocker arm 1 can slide freely on the screw 2, so that the second end of the rocker arm 1 can be movably connected to the shaft of the stator blade 3 in its length direction. The structure is simple and easy to implement, reducing the possibility of sticking during movement. Figure 6 As shown, in some embodiments, the opening direction of the notch 11 is perpendicular to the slotting direction of the slide groove 13, thereby avoiding interference between the two degrees of freedom and improving the stability of motion transmission.

[0038] In order to ensure the movement stability of the second end of the rocker arm 1 relative to the axis of the stator blade 3 in its length direction, as shown in FIG. Figure 4 and Figure 6As shown, in some specific embodiments, the length direction of the notch 11 and the length direction of the slide groove 13 are both consistent with the length direction of the rocker arm 1.

[0039] To facilitate installation, in some embodiments, Figure 4 and Figure 6 As shown, the side of the fork arm away from the linkage ring 5 is configured as an open structure, which will not reach the limit or slide out during normal operation; the other side has an arc-shaped limit shape, which will also not be touched under normal working conditions.

[0040] In order to improve the circumferential rotation of the stator blade 3 in the axial position, in some embodiments, the stator blade 3 is further included, and two sides of the shaft of the stator blade 3 are formed with planes that match the recess 11.

[0041] In some embodiments, a preset gap is provided between the screw head and nut of screw 2 and the fork arm. The screw head and nut at each end of screw 2 are not locked, leaving a certain gap with the fork arm. This screw prevents the fork arm from separating from the stator blade 3. Furthermore, the nut head and nut of screw 2 ensure a certain degree of adjustment accuracy as the fork arm ages and its inner diameter increases, preventing further expansion. This also provides a protective limit in special situations, such as when the fork arm is subjected to excessive force and severely deformed.

[0042] The traditional compressor stator blade adjustment mechanism uses connecting rods and rocker arms to drive and support the circumferential rotation and axial movement of the linkage ring and ensure its position in space. However, both of these are insufficient to provide sufficient support; generally, in structural design, limit screws are added to the linkage ring and corresponding bosses are designed and processed on the casing to control its extreme deformation and offset. This method is not able to well guarantee the concentricity of the linkage ring during movement, affecting the adjustment accuracy of the blades at the same level, and thus affecting the engine performance; secondly, the added limit screws and casing bosses will increase the complexity and weight of the structure; at the same time, if the linkage ring undergoes significant deformation during operation, the screws and bosses will come into contact and rub, thereby bringing additional friction resistance.

[0043] In some embodiments, the axial freedom of the linkage ring 5 on the casing 7 is constrained so that the linkage ring only needs to rotate along the circumference of the casing. The characteristic that the linkage ring 5 only needs to rotate circumferentially makes the transmission of force simpler. Under the same conditions, the force provided by the actuator is less.

[0044] like Figure 7As shown, in some embodiments, the compressor stator blade adjustment mechanism further includes a casing 7. A plurality of rollers 6 are provided on the inner ring of a linkage ring 5. An annular slideway 71 is provided on the outer wall of the casing 7. The plurality of rollers 6 are rotatably disposed within the annular slideway 71. The linkage ring 5 is in contact with the annular slideway 71 on the casing 7 via the rollers 6 carried by the linkage ring 5. During operation of the mechanism, the linkage ring 5 rotates circumferentially around the casing 7 along the slideway on the casing. The mechanism eliminates the need for stop screws and mating bosses on the casing 7, making it easy to implement and highly feasible.

[0045] In the above embodiment, the linkage ring only needs to rotate circumferentially and is not limited to the roller-slideway configuration proposed in the present invention. Other circumferential rotation mechanisms such as slide grooves can be used instead.

[0046] In some embodiments, the rollers 6 on the linkage ring 5 can be provided in multiple groups, evenly distributed around the circumference of the linkage ring 5, generally about 8 groups. The linkage ring 5 can be assembled in two or four sections for easy processing and installation.

[0047] In some embodiments, a wear-resistant coating may be applied to the annular slideway 71 of the casing or corresponding treatment may be performed to improve its wear resistance.

[0048] In the above embodiment, the linkage ring 5 only needs to rotate circumferentially and is not limited to the roller-slideway configuration proposed in the present invention. It can be replaced by other circumferential rotating mechanisms such as slideways.

[0049] Combine Figure 6 and Figure 8 As shown, in some embodiments, the connection between the rocker arm 1 and the linkage ring 5 can be achieved via a ball bearing 8 and a pin 4. The rocker arm 1 is provided with a pin hole 12. The pin 4 is fixed to the linkage ring 5. The ball bearing 8 and the pin 4 form a cylindrical pair, and the rocker arm and the ball bearing form a spherical joint. The ball bearing 8 can freely move up and down along the pin 4 during movement, and the rocker arm 1 and the ball bearing 8 can freely rotate.

[0050] According to some embodiments of the present disclosure, a compressor is provided, comprising the aforementioned compressor stator blade adjustment mechanism.

[0051] Thus far, various embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0052] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A compressor stator blade adjustment mechanism, characterized in that: include: A linkage ring (5) is configured to be disposed on the casing (7) and capable of circumferential rotation; A rocker arm (1), wherein a first end of the rocker arm (1) is hinged to the linkage ring (5), a second end of the rocker arm (1) is configured as a fork arm, a notch (11) is formed in the middle of the fork arm, and slide grooves (13) are formed on both sides of the fork arm, and a shaft portion of the stator blade (3) is arranged in the notch (11); and A screw (2) is arranged in the slide groove (13) and passes through the shaft of the stator blade (3), so that the second end of the rocker arm (1) can be movably hinged to the shaft of the stator blade (3) in its length direction.

2. The compressor stator blade adjustment mechanism according to claim 1, characterized in that: The opening direction of the notch (11) is perpendicular to the slotting direction of the sliding groove (13).

3. The compressor stator blade adjustment mechanism according to claim 1, characterized in that: The length direction of the notch (11) and the length direction of the slide groove (13) are both consistent with the length direction of the rocker arm (1).

4. The compressor stator blade adjustment mechanism according to claim 1, characterized in that: The side of the fork arm away from the linkage ring (5) is configured as an open structure.

5. The compressor stator blade adjustment mechanism according to claim 1, characterized in that: It also includes the stator blade (3), and two sides of the shaft portion of the stator blade (3) are formed with planes that match the recess (11).

6. The compressor stator blade adjustment mechanism according to claim 1, characterized in that: There is a preset gap between the screw head and nut of the screw (2) and the fork arm.

7. The compressor stator blade adjustment mechanism according to claim 1, characterized in that: The axial freedom of the linkage ring (5) on the casing (7) is constrained.

8. The compressor stator blade adjustment mechanism according to any one of claims 1 to 7, characterized in that: It also includes the casing (7), a plurality of rollers (6) are provided on the inner ring of the linkage ring (5), an annular slideway (71) is provided on the outer wall surface of the casing (7), and the plurality of rollers (6) are rotatably arranged in the annular slideway (71).

9. A compressor, characterized in that: It comprises the compressor stator blade adjustment mechanism according to any one of claims 1 to 8.

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