Axial limiting structure for rotor blades

Abstract

A rotor blade axial limiting structure includes a wheel disc, a rotor blade, and a limiting collar. The tenon of the rotor blade is installed in a tenon groove on the outer peripheral surface of the wheel disc; a groove is provided on the wheel disc rim; a tenon groove is provided on the tenon of the rotor blade; when the rotor blade is assembled on the wheel disc, the groove on the wheel disc and the tenon groove on the rotor blade are aligned in the axial direction to form a complete annular groove structure; the limiting collar is engaged in the annular groove structure. In the present invention, without changing the structure of the traditional wheel disc tenon groove and rotor blade tenon, the purpose of limiting the axial displacement of the rotor blade is achieved by providing a matching structure of the groove on the wheel disc rim, the tenon groove on the rotor blade, and the limiting collar. The circumferential and radial displacements of the rotor blade are limited by the traditional tenon and tenon groove matching structure. Therefore, the present invention simplifies the rotor blade axial limiting structure, reduces the number of assembled parts, makes the structure simpler and more compact, and improves reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of aero-engines, and in particular to an axial limiting structure for rotor blades. Background Art

[0002] The design of aircraft engine compressors needs to take into account various requirements such as size and structure, and should meet the characteristics of small size and space, few assembly parts, and simple and compact structure. For axially installed rotor blades, the blade tenon is inserted into the tenon groove of the wheel. The circumferential and radial displacements are limited by the wheel, but a limiting structure must be designed to limit axial displacement. The axial position of aircraft engine rotor blades is generally limited by pins, locking plates, or clamping rings + pins. These axial limiting structures are usually more complex. Due to the large number of rotor blades, a large number of parts such as pins and locking plates are required, and assembly is inconvenient. At the same time, the reliability of the limit cannot be guaranteed. Summary of the Invention

[0003] The main purpose of the present invention is to propose a rotor blade axial limiting structure, aiming to simplify the rotor blade axial limiting structure, reduce the number of parts to be assembled, and overcome the problems existing in the prior art.

[0004] To achieve the above-mentioned object, the present invention proposes a rotor blade axial limiting structure, comprising a wheel disc and a rotor blade, wherein the tenon of the rotor blade is installed in a tenon groove on the outer peripheral surface of the wheel disc, and further comprising a limiting collar;

[0005] A clamping groove is provided on the rim of the wheel disc; a tenon groove is provided on the tenon of the rotor blade; when the rotor blade is assembled on the wheel disc, the clamping groove on the wheel disc and the tenon groove on the rotor blade are aligned in the axial direction to form a complete annular groove structure; the limiting clamping ring is clamped in the annular groove structure.

[0006] Preferably, the types of the rotor blades include ordinary blades and circumferential locking blades; the types of tenon grooves include tenon grooves A provided on ordinary blades, and tenon grooves B provided on circumferential locking blades; the distance between the bottom of the tenon groove A and the tenon end face of the ordinary blade is L1; the distance between the bottom of the tenon groove B and the tenon end face of the circumferential locking blade is L2; wherein L1>L2; the bottoms of all the tenons on the wheel disc are on the same circumferential surface, and the tenon end faces of the ordinary blades and the circumferential locking blades both rest on the bottom of the tenon grooves of the wheel disc; a notch is provided on the outer circumferential surface of the limiting clamp; the tenon groove B of the circumferential locking blade is clamped on the notch to limit the circumferential rotation of the limiting clamp.

[0007] Preferably, the limit collar is a segmented structure. During assembly, multiple segments of the limit collar are connected end to end to form an integral annular structure.

[0008] Preferably, a support hook is provided on the wheel disc; a boss is provided on the inner circumference of each section of the limiting collar; and the boss is clamped in the support hook.

[0009] Preferably, the number of bosses on the inner circumferential surface of each section of the limiting collar is at least three.

[0010] Preferably, the number of the limiting collars is the same as the number of the circumferential locking blades; a notch is provided on the outer circumferential surface of each segment of the collar, and the position of the notch corresponds to the position of one of the bosses.

[0011] Preferably, the number of the limiting collar is three, and the number of the circumferential locking blades is three; the circumferential locking blades are evenly distributed on the circumferential surface of the wheel disc.

[0012] Preferably, the limiting collar is made of an elastic alloy material.

[0013] Preferably, a through hole is provided at the boss.

[0014] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0015] (1) In the rotor blade axial limiting structure provided by the present invention, when the rotor blade is assembled on the wheel disc, the circumferential position of the rotor blade is fixed by the blade's tenon and the tenon groove on the outer peripheral surface of the wheel disc. Since the disc rim has a retaining groove and the rotor blade's tenon has a tenon groove, after the rotor blade is transferred, the retaining groove on the disc and the tenon groove on the rotor blade are aligned in the axial direction to form a complete annular groove structure. A retaining collar is provided in the annular groove structure to achieve the purpose of limiting the axial movement of the blade in the disc's tenon groove.

[0016] (2) In the present invention, without changing the conventional wheel disc tenon and rotor blade tenon structure, the purpose of limiting the axial displacement of the rotor blade is achieved by providing a structure that cooperates with the groove on the wheel disc rim, the tenon groove on the rotor blade, and the limiting collar. The circumferential and radial displacements of the rotor blade are limited by the conventional tenon and tenon-groove structure. Therefore, the present invention simplifies the rotor blade axial limiting structure, reduces the number of assembled parts, makes the structure simpler and more compact, and improves reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0018] Figure 1This is a schematic diagram of the rotor blade axial limiting structure provided by the present invention;

[0019] Figure 2 This is a schematic diagram of the roulette structure of the present invention;

[0020] Figure 3 Schematic diagram comparing the structures of ordinary blades and circumferentially locked blades in the present invention;

[0021] Figure 4 It is a schematic diagram of the structure of the limiting clamp ring in the present invention.

[0022] Explanation of the accompanying figures: 1. Rotor blade; 11. Ordinary blade; 12. Circumferential locking blade; 101. Tenon groove; 13. Tenon groove A; 14. Tenon groove B; 2. Wheel; 21. Slot; 22. Support hook; 3. Limiting ring; 31. Notch; 32. Boss; 33. Through hole. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] Combine Figures 1 to 4 As shown, a rotor blade axial limiting structure includes a disk 2 and a rotor blade 1. The tenon of the rotor blade 1 is installed in a tenon groove on the outer circumferential surface of the disk 2. The structure also includes a limiting collar 3. A groove 21 is formed on the rim of the disk 2. A tenon groove 101 is provided on the tenon of the rotor blade 1. When the rotor blade 1 is assembled on the disk 2, the groove 21 on the disk 2 and the tenon groove 101 on the rotor blade 1 are axially aligned to form a complete annular groove structure. The limiting collar 3 is engaged in this annular groove structure. The limiting collar 3 is made of an elastic alloy material.

[0026] Combine Figure 1 、 Figure 3 and Figure 4As shown, the types of the rotor blades 1 include ordinary blades 11 and circumferential locking blades 12; the types of the tenon grooves 101 include tenon grooves A13 provided on the ordinary blades 11, and tenon grooves B14 provided on the circumferential locking blades 12; the distance between the bottom of the tenon groove A13 and the tenon end face of the ordinary blade 11 is L1; the distance between the bottom of the tenon groove B14 and the tenon end face of the circumferential locking blade 12 is L2; wherein L1>L2; the bottoms of all the tenons on the wheel disc 2 are on the same circumferential surface, and the tenon end faces of the ordinary blades 11 and the circumferential locking blades 12 both abut against the bottoms of the tenons of the wheel disc 2; a notch 31 is provided on the outer circumferential surface of the limiting clamp 3; the tenon groove B14 of the circumferential locking blade 12 is clamped on the notch 31 to limit the circumferential rotation of the limiting clamp 3. By controlling the dimension L1>L2, the purpose is to ensure that the bottom of the tenon groove B14 is well engaged with the bottom of the notch 31, so as to limit the limiting collar 3 and prevent the limiting collar 3 from circumferential rotation.

[0027] In this embodiment, the position limiting collar 3 is a segmented structure. During assembly, multiple segments of the position limiting collar 3 are connected end to end to form an integral annular structure. The position limiting collar 3 adopts a segmented structure mainly for the convenience of assembly.

[0028] Combine Figure 1 、 Figure 2 and Figure 4 As shown, the wheel disc 2 is provided with a hook 22; a boss 32 is provided on the inner circumference of each segment of the position-limiting collar 3; the boss 32 is engaged within the hook 22. There are at least three bosses 32 on the inner circumference of each segment of the position-limiting collar 3; specifically, there are three bosses 32 provided on each segment of the position-limiting collar 3. The structure in which the bosses 32 cooperate with the hook 22 prevents radial deformation and movement of the position-limiting collar 3, ensuring that the position-limiting collar 3 is well engaged within the annular groove structure. Furthermore, in this embodiment, there are three bosses 32 on the inner circumference of each segment of the position-limiting collar 3, distributed near both ends and in the middle of the position-limiting collar 3. By providing three bosses 32 and cooperating with the hook 22, the position-limiting collar 3 is maintained in its correct position and inward deformation and movement is prevented.

[0029] In this embodiment, the number of the limiting collars 3 is the same as the number of the circumferential locking blades 12; Figure 4 As shown, a notch 31 is provided on the outer circumference of each segment of the retaining ring 3. The position of this notch 31 corresponds to the position of one of the bosses 32. By providing a notch 31 on each segment of the retaining ring 3 and engaging with the tenon groove B on the corresponding circumferential locking blade 12, the circumferential rotation of the retaining ring 3 can be effectively restricted, thereby achieving the purpose of axially limiting the rotor blades.

[0030] In this embodiment, the limiting collar 3 is configured in three sections, and the number of circumferential locking blades 12 is configured in three pieces; these circumferential locking blades 12 are evenly distributed around the circumference of the disc 2. The three-section limiting collar 3 structure utilizes three circumferential locking blades 12 to limit the position of each section of the limiting collar 3. This three-point fixing structure ensures a complete rotation and secures the limiting collar 3, while also appropriately reducing the number of limiting collars 3, thereby reducing the number of parts. The number of limiting collars 3 and circumferential locking blades 12 can also be determined based on the diameter of the disc 2 and the number of rotor blades 1.

[0031] Combine Figure 4 As shown, a through hole 33 is provided at the boss 32. By providing the through hole 33, when assembling the limit collar 3, a tool such as a screwdriver can be inserted into the through hole 33 to facilitate pushing the limit collar 3 to move circumferentially, so that the boss 32 is engaged with the hook 22.

[0032] The rotor blade axial limiting structure provided by the present invention has the following assembly method:

[0033] When assembling the rotor, first insert all the ordinary blades 11 and the circumferential locking blades 12 into the tenon grooves of the wheel disc 2. Specifically, there are three circumferential locking blades 12, which are installed in the tenon grooves with determined numbers, so that the three circumferential locking blades 12 are evenly distributed on the wheel disc 2, and each circumferential locking blade 12 corresponds to the notch 31 on each section of the limiting clamp 3, ensuring that the clamping groove 21 on the wheel disc 2, the tenon groove A13 on the ordinary blade 11, and the tenon groove B14 on the circumferential locking blade 12 are aligned in the axial direction to form a complete annular groove structure, then stagger the notch 31 on each section of the limiting clamp 3 with the circumferential locking blade 12 at a certain angle, and put each section of the limiting clamp 3 into the annular groove structure. Until the outer diameter of each section of the limit collar 3 is pressed against the bottom of the tenon groove B14 of the circumferential locking blade 12; after tightening, the limit collar 3 is slowly rotated circumferentially in the annular groove structure, so that the boss 32 on the limit collar 3 gradually rotates into the wheel hook 22. At the same time, since the limit collar 3 is made of elastic alloy material, during the circumferential rotation angle in the annular groove structure, the notch 31 is squeezed by the circumferential locking blade 12 and will produce slight elastic deformation, until the notch 31 on the limit collar 3 is rotated into the tenon groove B14 of the circumferential locking blade 12, the limit collar 3 will rebound, so that the notch 31 is stuck in the tenon groove B14 of the circumferential locking blade 12.

[0034] At this time, the boss 32 on the limiting collar 3 has also completely entered the hook 22 of the wheel disc 2, and the rotor blade 1, wheel disc 2 and limiting collar 3 have all been assembled. The state after assembly is: the limiting collar 3 is located in the annular groove structure, and the tenon groove B on the circumferential locking blade 12 is inserted into the notch 31 of the limiting collar 3, limiting the circumferential rotation of the limiting collar 3, thereby achieving the purpose of axial limitation of the rotor blade 1.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A rotor blade axial limiting structure, comprising a wheel disc (2) and a rotor blade (1), wherein the tenon of the rotor blade (1) is installed in a tenon groove on the outer peripheral surface of the wheel disc (2), and is characterized in that: Also includes a limit collar (3); A slot (21) is provided on the rim of the wheel (2); A tenon groove (101) is provided on 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) and the tenon groove (101) on the rotor blade (1) are aligned in the axial direction to form a complete annular groove structure; the limiting clamping ring (3) is clamped in the annular groove structure; The types of the rotor blades (1) include ordinary blades (11) and circumferential locking blades (12); the types of the tenon grooves (101) include tenon grooves A (13) provided on the ordinary blades (11) and tenon grooves B (14) provided on the circumferential locking blades (12); The distance between the bottom of the tenon groove A (13) and the tenon end face of the common blade (11) is L1; the distance between the bottom of the tenon groove B (14) and the tenon end face of the circumferential locking blade (12) is L2; wherein L1>L2; The bottoms of all the tenons on the wheel disc (2) are on the same circumferential surface, and the tenon end faces of the common blades (11) and the circumferential locking blades (12) are all against the bottoms of the tenons of the wheel disc (2); A notch (31) is provided on the outer circumferential surface of the limiting clamp ring (3); the tenon groove B (14) of the circumferential locking blade (12) is engaged with the notch (31) to limit the circumferential rotation of the limiting clamp ring (3); The limit clamp (3) is a segmented structure. When assembled, multiple segments of the limit clamp (3) are connected end to end to form an overall ring structure. A support hook (22) is provided on the wheel disc (2); a boss (32) is provided on the inner circumference of each segment of the position-limiting collar (3); the boss (32) is clamped in the support hook (22); The limiting collar (3) is made of an alloy material having elasticity.

2. The rotor blade axial limiting structure according to claim 1, characterized in that: The number of bosses (32) on the inner circumferential surface of each segment of the limiting collar (3) is at least three.

3. The rotor blade axial limiting structure according to claim 1, characterized in that: The number of the limiting collars (3) is the same as the number of the circumferential locking blades (12); a notch (31) is provided on the outer peripheral surface of each segment of the collar (3), and the position of the notch (31) corresponds to the position of one of the bosses (32).

4. The rotor blade axial limiting structure according to claim 3, characterized in that: The number of the limiting collar (3) is three, and the number of the circumferential locking blades (12) is three; the circumferential locking blades (12) are evenly distributed on the circumferential surface of the wheel disc (2).

5. The rotor blade axial limiting structure according to claim 1, characterized in that: A through hole (33) is provided at the boss (32).

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