A flexible blade tenon protector

Abstract

The application discloses a flexible blade tenon protection device, which comprises a first ring sleeve, a second ring sleeve coaxially spliced together with the first ring sleeve, and a plurality of mortises adapted to the flexible blade tenon and arranged in the circumferential direction of the first ring sleeve. The bottom of the tenon is attached to the end face of the second ring sleeve to protect the tenon. The first ring sleeve is coaxially spliced together with the second ring sleeve through a connecting mechanism. The connecting mechanism comprises a first connecting piece and a second connecting piece; the first connecting piece is fixedly connected to the inner wall of the first ring sleeve; the second connecting piece is fixedly connected to the inner wall of the second ring sleeve; and the first connecting piece is fixedly connected to the second connecting piece. The first connecting piece is in a stepped structure, the second connecting piece is in a "I" structure, the second connecting piece is overlapped with the stepped surface of the first connecting piece and is fixedly connected to the first connecting piece. A spring is arranged between the stepped connection interface of the first connecting piece and the opposite surface of the second connecting piece. The two ring sleeves are attached to prevent the damaged tenon from causing secondary damage to the engine.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine technology and relates to the design of flexible blade tenon protection, and more particularly to a flexible blade tenon protection device to prevent secondary damage after tenon damage. Background Technology

[0002] With the continuous development of technology, people's travel is no longer limited to cars and ships; airplanes have also entered people's lives and become a means of transportation. The engine in an aircraft engine is a type of turbine engine. A turbine engine is a type of internal combustion engine that uses rotating components to extract kinetic energy from the fluid passing through it.

[0003] The flexible blades in existing aerospace engines, during later stages of operation, rotate at high speeds. This high-speed rotation causes frequent collisions between the blade's root and its connection point, potentially leading to root breakage. A break at the root could result in the broken blade impacting the engine's interior, causing damage and endangering the safety of passengers and crew. Currently, there is no satisfactory solution to this problem. Summary of the Invention

[0004] The purpose of this invention is to address the safety hazards caused by root fracture of existing flexible blades by providing a flexible blade tenon protection device. Under the premise of meeting the normal use of aero engines, the device protects the tenon of the engine blades and prevents the tenon from flying out due to centrifugal force imbalance.

[0005] The flexible blade tenon protection device provided by the present invention includes a first ring sleeve and a second ring sleeve coaxially spliced ​​together with the first ring sleeve. The first ring sleeve is provided with a plurality of tenons that are adapted to the flexible blade tenons along the circumferential direction.

[0006] The aforementioned flexible blade tenon protection device has the bottom of the tenon fitting against the end face of the second ring to protect the tenon.

[0007] In the aforementioned flexible blade tenon protection device, the first ring sleeve is coaxially spliced ​​with the second ring sleeve via a connecting mechanism. The connecting structure includes a first connector and a second connector; the first connector is fixedly connected to the inner wall of the first ring sleeve; the second connector is fixedly connected to the inner wall of the second ring sleeve; and the first connector and the second connector are fixedly connected. In a preferred embodiment, the first connector has a stepped structure, and the second connector has an "I"-shaped structure; the second connector and the stepped surface of the first connector overlap and are fixedly connected. Furthermore, a spring is provided between the stepped interface of the first connector and the opposing surface of the second connector. During later operation, the spring can be used to pull the first connector and the second connector, assisting in their docking.

[0008] The aforementioned flexible blade tenon protection device has a wind-breaking head at the end of the first ring sleeve furthest from the second ring sleeve. A protective layer is provided between the flexible blade tenon and the flexible blade. The wind-breaking head and protective layer can reduce damage to the root of the flexible blade due to prolonged operation during normal airflow, thereby improving the service life of the flexible blade. The wind-breaking head is designed with a streamlined, arc-shaped surface, which can guide the airflow impacting the middle of the engine to the rotating flexible blade.

[0009] Compared with the prior art, the flexible blade tenon protection device provided by the present invention has the following beneficial effects:

[0010] (1) The present invention protects the tenon by fitting the bottom of the tenon with the second ring, and prevents the damaged tenon from causing secondary damage to the engine by fitting the two rings together.

[0011] (2) The present invention reduces root loss by using the wind-breaking head and tenon protective layer set by the first ring.

[0012] (3) The wind-breaking head of the present invention is designed as a streamlined flexible blade that can guide the airflow in the middle of the impact engine to rotate. Attached Figure Description

[0013] Figure 1 This is an overall schematic diagram including the flexible blades and protective devices;

[0014] Figure 2 This is a schematic diagram of the flexible blade connection structure;

[0015] Figure 3 This is a schematic diagram of the flexible blade tenon protection device.

[0016] Figure 4 This is a schematic diagram of the connection structure in the flexible blade tenon protection device;

[0017] In the diagram, 01-outer shell, 02-flexible blade, 03-flexible blade tenon protection device, 04-tenon, 05-protective layer, 1-first ring, 11-mortise, 12-wind breaker, 2-second ring, 3-connecting structure, 31-first connector, 32-second connector, 33-spring, 34-first screw, 35-second screw, 36-third screw. Detailed Implementation

[0018] The technical solutions of various embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are part of the present invention.

[0019] Example 1

[0020] The flexible blade tenon protection device provided in this embodiment of the invention is mainly used to protect, for example, the blade tenon protection device of the present invention. Figure 1 and Figure 2 The flexible blades and tenons are shown. The fan, composed of flexible blades, is installed at the air inlet of the aircraft engine; the fan as a whole includes an outer shell 01, several flexible blades 02, a flexible blade tenon protection device 03, and tenons 04; the outer shell is installed on the frame at the air inlet of the engine; a protective layer 05 is provided on the surface of the tenon 04, which in this embodiment is made of titanium alloy, and the protective layer is connected to the tenon and blades on both sides by welding.

[0021] The flexible blade tenon protection device 03 includes a first ring sleeve 1, a second ring sleeve 2, and a connecting structure 3 that coaxially splices the first ring sleeve 1 and the second ring sleeve 2 together.

[0022] The first ring 1 has several mortises 11 along its circumference that fit the tenon 04. The end of the first ring 1 away from the second ring is provided with a windbreak head 12. The second ring has a cylindrical structure, and its end face shape is the same as the face opposite to the first ring.

[0023] The connecting structure 3 includes a first connector 31 and a second connector 32. The first connector 31 is in the form of... The structure is stepped. The second connector 32 has a straight "I" shape. A spring 33 is welded between the interface of the first connector and the opposite surface of the second connector.

[0024] The flexible blade tenon protection device is assembled as follows: the tenon 04 with the flexible blade is inserted into the mortise 11 of the first ring sleeve; the first connecting piece is fixed to the inner wall of the first ring sleeve 1 by the first screw 34; the first connecting piece 31 and the second connecting piece are pulled by the spring 33, so that the second connecting piece overlaps with the stepped surface of the first connecting piece and is fixedly connected by the second screw 35; the second connecting piece is fixed to the inner wall of the second ring sleeve by the third screw 36. This allows the first ring sleeve and the second ring sleeve to fit snugly and securely, with the second ring sleeve fitting against the bottom of the tenon to protect it; simultaneously, the spring provides a cushioning effect during operation.

[0025] When an aircraft engine is running, the flexible blades are driven to rotate at high speed. During this high-speed rotation, a second, fitted ring protects the bottom of the tenon, preventing it from flying out due to unbalanced centrifugal force. If the flexible blade breaks due to high-speed rotation, the centrifugal force may shift. Although the mortise and tenon structure can reduce the centrifugal force deviation caused by the loss of a single blade, it can also prevent the tenon at the broken point from fitting tightly into the mortise and tenon groove due to insufficient centrifugal force, potentially causing the tenon to fly out. The second ring, by fitting the tenon tightly, can limit the tenon's position should a blade break later, preventing secondary damage to the engine. Simultaneously, the first ring's air-breaking head and tenon protection layer ensure normal airflow while reducing root damage to the flexible blades caused by prolonged operation.

[0026] Those skilled in the art will recognize that the embodiments described herein are intended to help the reader understand the principles of the invention, and should be understood that the scope of protection of the invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on the technical teachings disclosed in this invention without departing from the spirit of the invention, and these modifications and combinations are still within the scope of protection of this invention.

Claims

1. A flexible blade tenon protection device, comprising a first ring sleeve (1) and a second ring sleeve (2) coaxially spliced ​​together with the first ring sleeve (1), wherein the first ring sleeve (1) is provided with a plurality of tenons (11) adapted to the flexible blade tenons along the circumferential direction; the bottom of the tenon is fitted with the end face of the second ring sleeve (2); the first ring sleeve (1) is coaxially spliced ​​together with the second ring sleeve (2) through a connecting structure (3); the connecting structure (3) includes a first connector (31) and a second connector (32); the first connector (31) is fixedly connected to the inner wall of the first ring sleeve (1); the second connector (32) is fixedly connected to the inner wall of the second ring sleeve (2); the first connector (31) and the second connector are fixedly connected; the first connector (31) has a stepped structure, the second connector (32) has an "I" structure, the second connector and the stepped surface of the first connector are overlapped and fixedly connected; a spring (33) is provided between the stepped interface of the first connector and the opposite surface of the second connector.

2. The flexible blade tenon protection device according to claim 1, characterized in that, The first ring (1) is provided with a wind-breaking head (12) at the end away from the second ring.

3. The flexible blade tenon protection device according to claim 1, characterized in that, A protective layer is provided between the flexible blade tenon and the flexible blade.

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