CN115419470A - Axial limiting structure of rotor blade - Google Patents

Abstract

A rotor blade axial limiting structure comprises a wheel disc, rotor blades and a limiting retainer ring, wherein tenons of the rotor blades are arranged in mortises on the outer peripheral surface of the wheel disc; the rim of the wheel disc is provided with a clamping groove; a tenon groove is formed in the tenon of the rotor blade; when the rotor blade is assembled on the wheel disc, the clamping groove on the wheel disc is aligned with the tenon groove on the rotor blade in the axial direction to form a complete annular groove structure; the limiting retainer ring is clamped in the annular groove structure. According to the invention, under the condition that the traditional structures of the wheel disc mortises and rotor blade tenons are not changed, the purpose of limiting the axial displacement of the rotor blade is realized by arranging the structure that the clamping grooves on the disc edge of the wheel disc, the tenon grooves on the rotor blade and the limiting clamping rings are matched, and the circumferential displacement and the radial displacement of the rotor blade are limited by the traditional structures of the tenons and the mortises. Therefore, the axial limiting structure of the rotor blade is simplified, the number of parts to be assembled is reduced, the structure is simpler and more compact, and the reliability is improved.

Description

Axial limiting structure of rotor blade

Technical Field

The invention relates to the technical field of aero-engines, in particular to an axial limiting structure of a rotor blade.

Background

The design of the air compressor of the aero-engine needs to meet the requirements of all aspects such as size, structure and the like, and the characteristics of small size space, few assembling parts and simple and compact structure are met. For the rotor blade axially installed, the blade tenon is inserted into the mortise of the wheel disc, the circumferential displacement and the radial displacement are limited by the wheel disc, but a limit structure is required to be designed to limit the axial displacement. The aeroengine rotor blade axial is spacing generally to use modes such as pin, locking plate or rand + pin, and these axial limit structure are comparatively complicated usually, because rotor blade number is more, need parts such as pin, locking plate quantity many, and the assembly is inconvenient, spacing reliability can not guarantee yet simultaneously.

Disclosure of Invention

The invention mainly aims to provide an axial limiting structure of a rotor blade, and aims to simplify the axial limiting structure of the rotor blade and reduce the number of parts to be assembled so as to overcome the problems in the prior art.

In order to achieve the purpose, the invention provides an axial limiting structure of a rotor blade, which comprises a wheel disc and the rotor blade, wherein a tenon of the rotor blade is arranged in a mortise on the peripheral surface of the wheel disc, and the axial limiting structure also comprises a limiting retainer ring;

the rim of the wheel disc is provided with a clamping groove; a tenon groove is formed in the tenon of the rotor blade; when the rotor blade is assembled on the wheel disc, the clamping groove on the wheel disc is aligned with the tenon groove on the rotor blade in the axial direction to form a complete annular groove structure; the limiting clamping ring is clamped in the annular groove structure.

Preferably, the types of the rotor blades comprise a common blade and a circumferential locking blade; the types of the tenon grooves comprise a tenon groove A arranged on the common blade and a tenon groove B arranged on the circumferential locking blade; the distance between the groove bottom of the tenon groove A and the tenon end face of the common blade is L1; the distance from the groove bottom of the tenon groove B to the tenon end face of the circumferential locking blade is L2; wherein L1 > L2; the groove bottoms of all the mortises on the wheel disc are positioned on the same circumferential surface, and the tenon end surfaces of the common blade and the circumferential locking blade are abutted against the groove bottoms of the mortises of the wheel disc; a gap is arranged on the peripheral surface of the limiting clamping ring; the tenon groove B of the circumferential locking blade is clamped on the notch and used for limiting the circumferential rotation of the limiting clamping ring.

Preferably, the limiting clamping ring is of a sectional structure, and the multiple sections of the limiting clamping rings are connected end to form an integral annular structure during assembly.

Preferably, a supporting hook is arranged on the wheel disc; a boss is arranged on the inner circumferential surface of each section of the limiting clamping ring; the boss is clamped in the support hook.

Preferably, the number of the bosses on the inner peripheral surface of each section of the limiting clamping ring is at least three.

Preferably, the number of the limiting clamping rings is the same as that of the circumferential locking blades; the outer peripheral surface of each section of the retainer ring is provided with a notch, and the position of the notch corresponds to the position of one boss.

Preferably, the number of the limiting clamping rings is three, and the number of the circumferential locking blades is three; the circumferential locking blades are uniformly distributed on the circumferential surface of the wheel disc.

Preferably, the limiting clamping ring is made of an alloy material with elasticity.

Preferably, a through hole is provided at the boss.

Due to the adoption of the technical scheme, the invention has the following beneficial effects:

(1) According to the rotor blade axial limiting structure provided by the invention, when the rotor blade is assembled on the wheel disc, the circumferential position of the rotor blade is installed and positioned through the tenon of the blade and the mortise on the outer peripheral surface of the wheel disc. Because the edge of the wheel disc is provided with the clamping groove, the tenon of the rotor blade is provided with the tenon groove, after the rotor blade is rotationally matched, the clamping groove on the wheel disc and the tenon groove on the rotor blade are axially aligned to form a complete annular groove structure, and the annular groove structure is internally provided with the limiting clamping ring, so that the aim of limiting the axial movement of the blade in the wheel disc mortise is fulfilled.

(2) According to the invention, under the condition that the traditional structures of the wheel disc mortises and the rotor blade tenons are not changed, the purpose of limiting the axial displacement of the rotor blade is realized by arranging the matched structures of the clamping grooves on the disc edge of the wheel disc, the tenon grooves on the rotor blade and the limiting clamping rings, and the circumferential and radial displacements of the rotor blade are limited by the traditional structures of the tenons and the mortises. Therefore, the axial limiting structure of the rotor blade is simplified, the number of parts to be assembled is reduced, the structure is simpler and more compact, and the reliability is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic view of an axial limiting structure of a rotor blade provided by the present invention;

FIG. 2 is a schematic view of a wheel disc structure according to the present invention;

FIG. 3 is a schematic diagram showing a structural comparison between a conventional blade and a circumferential locking blade according to the present invention;

fig. 4 is a schematic view of the structure of the limiting collar of the present invention.

The reference numbers indicate: 1. a rotor blade; 11. a common blade; 12. circumferentially locking the blades; 101. a tenon groove; 13. a tenon groove A; 14. a tenon groove B; 2. a wheel disc; 21. a card slot; 22. supporting a hook; 3. a limiting retainer ring; 31. a notch; 32. a boss; 33. and a through hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicators are changed accordingly.

With reference to fig. 1 to 4, an axial limiting structure of a rotor blade includes a wheel disc 2 and a rotor blade 1, wherein a tenon of the rotor blade 1 is installed in a mortise on the outer peripheral surface of the wheel disc 2, and the axial limiting structure is characterized by further including a limiting collar 3; a clamping groove 21 is formed on the rim of the wheel disc 2; a tenon groove 101 is formed in the tenon of the rotor blade 1; when the rotor blade 1 is assembled on the wheel disc 2, the clamping groove 21 on the wheel disc 2 is aligned with the tenon groove 101 on the rotor blade 1 in the axial direction to form a complete annular groove structure; the limiting clamping ring 3 is clamped in the annular groove structure. The limiting clamp ring 3 is made of an elastic alloy material.

As shown in fig. 1, 3 and 4, the rotor blade 1 includes a general blade 11 and a circumferential locking blade 12; the types of the tenon groove 101 include a tenon groove a13 provided on the ordinary blade 11, and a tenon groove B14 provided on the circumferential locking blade 12; the distance from the groove bottom of the tenon groove A13 to the tenon end face of the common blade 11 is L1; the distance between the groove bottom of the tenon groove B14 and the tenon end face of the circumferential locking blade 12 is L2; wherein L1 > L2; the groove bottoms of all mortises on the wheel disc 2 are positioned on the same circumferential surface, and the tenon end surfaces of the common blades 11 and the circumferential locking blades 12 are abutted against the groove bottoms of the mortises of the wheel disc 2; a gap 31 is arranged on the peripheral surface of the limit retainer ring 3; the tenon groove B14 of the circumferential locking blade 12 is snapped on the notch 31 to limit the circumferential rotation of the limiting retainer ring 3. Through controlling the size that L1 > L2, the tank bottom of guaranteeing tenon recess B14 is good the joint on the tank bottom of breach 31 for form spacing to spacing rand 3, avoid spacing rand 3 to take place circumferential direction.

In this embodiment, the stop collar 3 is a segmented structure, and when assembling, the multiple segments of stop collars 3 are connected end to form an integral annular structure. The limiting clamp ring 3 adopts a sectional structure, and the main purpose is to facilitate assembly.

As shown in fig. 1, 2 and 4, a supporting hook 22 is provided on the wheel disc 2; a boss 32 is arranged on the inner circumferential surface of each section of the limiting clamping ring 3; the boss 32 is clamped in the support hook 22. The number of the bosses 32 on the inner circumferential surface of each section of the limiting clamping ring 3 is at least three, and specifically, the number of the bosses 32 arranged on each section of the limiting clamping ring 3 is three. By utilizing the structure that the boss 32 is matched with the support hook 22, the radial deformation movement of the limiting clamp ring 3 can be avoided, so that the limiting clamp ring 3 is well clamped in the annular groove structure. In addition, in this embodiment, the number of the bosses 32 on the inner peripheral surface of each section of the limiting retainer ring 3 is three, and the bosses are distributed at positions of the limiting retainer ring 3 close to the two ends and at the middle position, and the bosses 32 are arranged at the three positions and matched with the support hook 22, so that the position of the limiting retainer ring 3 is ensured, and the inward deformation and movement of the limiting retainer ring 3 are avoided.

In the present embodiment, the number of the retainer collars 3 is the same as the number of the circumferential locking blades 12; as shown in fig. 4, a notch 31 is provided on the outer peripheral surface of each segment of the retainer ring 3, and the position of the notch 31 corresponds to the position of one of the bosses 32. Through arranging a notch 31 on each section of the limiting clamping ring 3 and clamping the notch with the tenon groove B on the corresponding circumferential locking blade 12, the circumferential rotation of the limiting clamping ring 3 can be effectively limited, and the axial limiting purpose of the rotor blade is achieved.

In this embodiment, the number of the limiting retainer ring 3 is three, and the number of the circumferential locking blades 12 is three; the circumferential locking blades 12 are uniformly distributed on the circumferential surface of the wheel disc 2. Three-section limiting retainer ring 3 structure is arranged, three circumferential locking blades 12 are used for limiting each section of limiting retainer ring 3 respectively, and the three-point fixing structure can ensure the whole ring, certainly, the limiting retainer ring 3 is fixed, the number of the limiting retainer rings 3 can be properly reduced, and the purpose of reducing the number of parts is achieved. The number of the limiting clamp ring 3 and the circumferential locking blades 12 can also determine the number of the segments of the limiting clamp ring 3 according to the factors of the diameter of the wheel disc 2 and the number of the rotor blades 1.

As shown in fig. 4, a through hole 33 is provided at the boss 32. By the arrangement, when the limiting clamp ring 3 is assembled, a tool such as a screwdriver can be used for being inserted into the through hole 33 so as to push the limiting clamp ring 3 to move circumferentially, so that the boss 32 is clamped into the hook 22.

The invention provides a rotor blade axial limiting structure, and an assembling method thereof is as follows:

when a rotor is assembled, all the common blades 11 and the circumferential locking blades 12 are inserted into a mortise of the wheel disc 2, specifically, the number of the circumferential locking blades 12 is three, the three circumferential locking blades 12 are installed into the mortise with determined number, so that the three circumferential locking blades 12 are uniformly distributed on the wheel disc 2, each circumferential locking blade 12 corresponds to a notch 31 on each section of the limiting retainer ring 3, the clamping groove 21 on the wheel disc 2, a tenon groove A13 on the common blade 11 and a tenon groove B14 on the circumferential locking blade 12 are ensured to be aligned in the axial direction to form a complete annular groove structure, then the notch 31 on each section of the limiting retainer ring 3 is staggered with the circumferential locking blade 12 by a certain angle, each section of the limiting retainer ring 3 is placed into the annular groove structure, and until the outer diameter of each section of the limiting retainer ring 3 is tightly pressed against the bottom of the tenon groove B14 of the circumferential locking blade 12; after the top is tight, with spacing rand 3 along the slow rotation angle of circumference in the ring channel structure, make boss 32 on the spacing rand 3 rotate gradually and get into in rim plate support hook 22, and simultaneously, because spacing rand 3 makes for elastic alloy material, along circumference rotation angle in-process in the ring channel structure, the extrusion that receives circumference locking blade 12 can produce slight elastic deformation in breach 31 department, when in breach 31 on the spacing rand 3 rotatory to the tenon recess B14 with circumference locking blade 12, spacing rand 3 just can kick-back, make breach 31 block in the tenon recess B14 of circumference locking blade 12.

At this moment, the boss 32 on the limit retainer ring 3 also completely enters the supporting hook 22 of the wheel disc 2, the rotor blade 1, the wheel disc 2 and the limit retainer ring 3 are all assembled, and the state after the assembly is as follows: the limiting clamping ring 3 is positioned in the annular groove structure, and the tenon groove B on the circumferential locking blade 12 is clamped in the notch 31 of the limiting clamping ring 3 to limit the circumferential rotation of the limiting clamping ring 3, so that the axial limiting purpose of the rotor blade 1 is achieved.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the specification and drawings or directly/indirectly applied to other related technical fields under the inventive concept are included in the scope of the present invention.

Claims (9)

1. A rotor blade axial limiting structure comprises a wheel disc (2) and rotor blades (1), wherein tenons of the rotor blades (1) are arranged in mortises on the outer peripheral surface of the wheel disc (2), and the rotor blade axial limiting structure is characterized by further comprising a limiting retainer ring (3);

a clamping groove (21) is formed in the disc edge of the wheel disc (2);

a tenon groove (101) is formed in the tenon of the rotor blade (1);

when the rotor blade (1) is assembled on the wheel disc (2), the clamping groove (21) on the wheel disc (2) is axially aligned with the tenon groove (101) on the rotor blade (1) to form a complete annular groove structure; the limiting retainer ring (3) is clamped in the annular groove structure.

2. A rotor blade axial limit structure as claimed in claim 1, wherein the types of the rotor blade (1) include a plain blade (11) and a circumferential locking blade (12); the types of the tenon groove (101) comprise a tenon groove A (13) arranged on the common blade (11) and a tenon groove B (14) arranged on the circumferential locking blade (12);

the distance between the groove bottom of the tenon groove A (13) and the tenon end face of the common blade (11) is L1; the distance between the groove bottom of the tenon groove B (14) and the tenon end face of the circumferential locking blade (12) is L2; wherein L1 > L2;

the groove bottoms of all the mortises on the wheel disc (2) are positioned on the same circumferential surface, and the tenon end surfaces of the common blade (11) and the circumferential locking blade (12) are abutted against the groove bottoms of the mortises of the wheel disc (2);

a notch (31) is arranged on the peripheral surface of the limiting clamping ring (3); the tenon groove B (14) of the circumferential locking blade (12) is clamped on the notch (31) and used for limiting the circumferential rotation of the limiting clamping ring (3).

3. A rotor blade axial retention structure as claimed in claim 2, characterised in that the retention clip (3) is of a segmented construction, the segments (3) being assembled end to form an integral annular structure.

4. A rotor blade axial spacing structure as claimed in claim 3, characterized in that a supporting hook (22) is provided on the disc (2); a boss (32) is arranged on the inner circumferential surface of each section of the limiting clamping ring (3); the lug boss (32) is clamped in the support hook (22).

5. A rotor blade axial position limiting structure as defined in claim 4, wherein the number of the projections (32) on the inner peripheral surface of each of the position limiting collars (3) is at least three.

6. A rotor blade axial stop according to claim 4, characterised in that the number of stop collars (3) is the same as the number of circumferential locking blades (12); a notch (31) is arranged on the outer peripheral surface of each section of the retainer ring (3), and the position of the notch (31) corresponds to the position of one boss (32).

7. The axial limiting structure of the rotor blade as claimed in claim 6, characterized in that the number of the limiting clamping ring (3) is three, and the number of the circumferential locking blades (12) is three; the circumferential locking blades (12) are uniformly distributed on the circumferential surface of the wheel disc (2).

8. A rotor blade axial limit structure as claimed in claim 1, wherein the limit collar (3) is made of an alloy material having elasticity.

9. A rotor blade axial retention structure as claimed in claim 4, characterised in that a through hole (33) is provided at the boss (32).

Images