阅读说明：本技术 一种风扇叶片 (Fan blade ) 是由 刘传欣 曹源 倪晓琴 龙丹 王祯鑫 王少辉 王星星 赵宪涛 于 2019-03-19 设计创作，主要内容包括：本发明的目的是提供一种风扇叶片。本发明提供的风扇叶片,包括前缘层,前缘层连接在中间部的前侧边缘；吸力面层包括主体部和边缘部；在中间部的周向上,前缘层的两端分别与边缘部的前端和压力面层连接,边缘部的后端与主体部连接；其中,压力面层、前缘层和边缘部由第一密度材料制成。由于前缘层的设置,使得中间部的在风扇叶片的厚度方向上的两侧分别与压力面层和吸力面层的接缝不会直接暴露在外,风扇叶片受到鸟撞时,该接缝不会直接遭受撞击,使得风扇叶片不易分层,因而该风扇叶片具有强度高、受撞击不易分层的优点。(The invention aims to provide a fan blade. The invention provides a fan blade, which comprises a front insulating layer, a front edge layer and a fan blade, wherein the front edge layer is connected to the front edge of a middle part; the suction surface layer comprises a main body part and an edge part; in the circumferential direction of the middle part, two ends of the front insulating layer are respectively connected with the front end of the edge part and the pressure surface layer, and the rear end of the edge part is connected with the main body part; wherein the pressure facing layer, the front dielectric layer, and the edge portion are made of a first density material. Due to the arrangement of the front insulating layer, seams between two sides of the middle part in the thickness direction of the fan blade and the pressure surface layer and between two sides of the middle part and the suction surface layer are not directly exposed, when the fan blade is impacted by birds, the seams are not directly impacted, and the fan blade is not easily layered, so that the fan blade has the advantages of high strength and difficulty in layering due to impact.)

1. A fan blade comprising a pressure facing (1), an intermediate portion (2) and a suction facing (3); the pressure surface layer (1) is provided with a pressure surface (1a), and the suction surface layer (3) is provided with a suction surface (3 a); the pressure surface layer (1), the middle part (2) and the suction surface layer (3) are sequentially connected in a stacking manner along the thickness direction of the fan blade (900);

characterized in that the fan blade (900) further comprises a front insulation layer (4), the front insulation layer (4) being connected to a front side edge of the intermediate portion (2); the suction surface layer (3) comprises a main body part (31) and an edge part (32);

in the circumferential direction of the middle part (2), two ends of the front insulating layer (4) are respectively connected with the front end of the edge part (32) and the pressure surface layer (1), and the rear end of the edge part (32) is connected with the main body part (31); wherein the pressure face layer (1), the front insulation layer (4) and the edge portion (32) are made of a first density material.

2. The fan blade of claim 1, characterized in that the fan blade (900) further comprises a stitch (5); the sewing line (5) penetrates the pressure surface layer (1), the intermediate portion (2), and the edge portion (32) in the thickness direction of the fan blade (900) to integrally connect the pressure surface layer (1), the intermediate portion (2), and the edge portion (32).

3. A fan blade as claimed in claim 2, characterized in that the stitch (5) comprises a first line portion (5a) and a second line portion (5 b); the first line portion (5a) penetrates the pressure surface layer (1), the intermediate portion (2), and the edge portion (32) in the thickness direction of the fan blade (900);

the second line portion (5b) penetrates the pressure surface layer (1), the intermediate portion (2), and the main body portion (31) in the thickness direction of the fan blade (900) to integrally connect the pressure surface layer (1), the intermediate portion (2), and the main body portion (31).

4. A fan blade according to claim 3, characterized in that the first line portion (5a) and/or the second line portion (5b) extend from the suction surface (3a) through the fan blade (900) to the pressure surface (1a), from the pressure surface (1a) through the fan blade (900) and to the suction surface (3a) in the thickness direction of the fan blade (900); and/or

The first line portion (5a) and/or the second line portion (5b) extend from the pressure surface (1a) through the fan blade (900) to the suction surface (3a), and from the suction surface (3a) through the fan blade (900) to the pressure surface (1a) in the thickness direction of the fan blade (900).

5. A fan blade according to claim 1, characterised in that the pressure facing (1), the leading layer (4) and the rim portion (32) are integrally formed.

6. The fan blade of claim 1 wherein said first density material is a metal.

7. A fan blade as claimed in claim 2, characterized in that the intermediate portion (2) comprises a plurality of intermediate layers (2 a); the intermediate layers (2a) are sequentially connected in a stacking manner in the thickness direction of the fan blade (900); the front edge of each intermediate layer (2a) is connected to the front insulating layer (4);

wherein two adjacent intermediate layers (2a) are made of the first and second density material, respectively, and the intermediate layer (2a) connected with the pressure face layer (1) is made of the second density material.

8. A fan blade as claimed in claim 7, characterized in that the number of intermediate layers (2a) is odd, the body portion (31) being made of the first density material; or

The number of intermediate layers (2a) is even, and the main body portion (31) is made of the second density material.

9. The fan blade of claim 8 wherein the density of the first density material is greater than the density of the second density material.

10. The fan blade of claim 9 wherein said second density material is a composite material.

11. The fan blade as set forth in claim 2, characterized in that said pressure surface layer (1) and said edge portion (32) are provided with sewing microholes (K) for passing said sewing thread (5).

12. The fan blade according to claim 9, characterized in that the pressure surface layer (1), the intermediate layer (2a) made of the first density material and the main body portion (31) made of the first density material are provided with stitching micro-holes (K) for the stitching threads (5) to pass through.

Technical Field

The present invention relates to a fan blade, and more particularly to a rotor blade for an aircraft turbine engine.

Background

One of the keys of a civil aircraft engine is a large size fan blade. The strength requirements are more stringent due to the increased size of the blades. For a high bypass ratio turbofan engine, solid fan blades cannot meet the requirements, and light fan blades need to be created.

The weight reduction design is carried out on the foreign advanced civil engines: the R & R company generates a hollow pure titanium alloy hollow fan blade with a reinforced stringer through a superplastic forming-diffusion connection technology; the fan blade of GE company adopts the composite material blade that comprises different materials (composite material and titanium alloy), and composite material is the blade main part, and titanium alloy is as borduring. The weight-reducing hollow rate of the pure titanium alloy hollow fan blade of the R & R company reaches 40%, and the equivalent weight-reducing hollow rate of the composite material-titanium alloy edge-covered blade of the GE company reaches more than 60%. Both of these designs are key patented technologies for engine design and manufacture. The design of lightweight fan blades is gaining importance from various large engine companies.

Patent document CN106762813A discloses a fan blade characterized in that the fan blade is made up of layers of different materials laid up along the thickness direction thereof in at least one chord-wise section. In this solution, adjacent material layers are joined together by gluing. This design is susceptible to de-bonding and delamination when struck by a bird, resulting in blade failure.

Disclosure of Invention

The invention aims to provide a fan blade which has the advantages of high strength and difficulty in layering due to impact.

To achieve the stated purpose, the fan blade includes the pressure surface course, intermediate part and suction surface course; the pressure surface layer is provided with a pressure surface, and the suction surface layer is provided with a suction surface; the pressure surface layer, the middle part and the suction surface layer are sequentially connected in an overlaying manner in the thickness direction of the fan blade;

wherein the fan blade further comprises a leading edge layer connected to a leading edge of the middle portion; the suction surface layer comprises a main body part and an edge part;

in the circumferential direction of the middle part, two ends of the front insulating layer are respectively connected with the front end of the edge part and the pressure surface layer, and the rear end of the edge part is connected with the main body part; wherein the pressure facing, the front layer, and the edge portion are made of a first density material.

In one embodiment, the fan blade further comprises a suture; the stitching line penetrates the pressure surface layer, the intermediate portion, and the edge portion in a thickness direction of the fan blade to integrally connect the pressure surface layer, the intermediate portion, and the edge portion.

In one embodiment, the suture comprises a first portion and a second portion; the first line portion penetrates the pressure surface layer, the intermediate portion, and the edge portion in a thickness direction of the fan blade;

the second line portion penetrates the pressure surface layer, the intermediate portion, and the main body portion in a thickness direction of the fan blade to integrally connect the pressure surface layer, the intermediate portion, and the main body portion.

In one embodiment, the first line portion and/or the second line portion extend from the suction surface through the fan blade to the pressure surface, and from the pressure surface through the fan blade to the suction surface in a thickness direction of the fan blade; and/or

The first line portion and/or the second line portion extend from the pressure surface through the fan blade to the suction surface, and from the suction surface through the fan blade to the pressure surface in a thickness direction of the fan blade.

In one embodiment, the pressure face layer, the front insulating layer and the edge portion are integrally molded.

In one embodiment, the first density material is a metal.

In one embodiment, the intermediate portion comprises a plurality of intermediate layers; the intermediate layers are sequentially connected in a stacking manner along the thickness direction of the fan blades; the leading edge of each of the intermediate plies is joined to the leading edge ply;

wherein two adjacent intermediate layers are made of the first and second density materials, respectively, and the intermediate layer connected to the pressure face layer is made of the second density material.

In one embodiment, the number of the intermediate layers is an odd number, and the main body portion is made of the first density material; or

The number of the intermediate layers is even, and the main body portion is made of the second density material.

In one embodiment, the density of the first density material is greater than the density of the second density material.

In one embodiment, the second density material is a composite material.

In one embodiment, the pressure surface layer and the edge portion are provided with stitching micropores for the stitching thread to pass through.

In one embodiment, the pressure surface layer, the middle layer made of the first density material and the main body made of the first density material are provided with stitching micropores for the stitching threads to pass through.

The positive progress effects of the invention are as follows: the invention provides a fan blade, which comprises a front insulating layer, a front edge layer and a fan blade, wherein the front edge layer is connected to the front edge of a middle part; the suction surface layer comprises a main body part and an edge part; in the circumferential direction of the middle part, two ends of the front insulating layer are respectively connected with the front end of the edge part and the pressure surface layer, and the rear end of the edge part is connected with the main body part; wherein the pressure facing layer, the front dielectric layer, and the edge portion are made of a first density material.

Due to the arrangement of the front insulating layer, seams between two sides of the middle part in the thickness direction of the fan blade and the pressure surface layer and between two sides of the middle part and the suction surface layer are not directly exposed, when the fan blade is impacted by birds, the seams are not directly impacted, and the fan blade is not easily layered, so that the fan blade has the advantages of high strength and difficulty in layering due to impact.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view of a fan blade;

FIG. 2 is a schematic view of section A-A of FIG. 1;

FIG. 3 is a schematic view of section B-B of FIG. 1;

FIG. 4 is a cross-sectional view of the fan blade showing the stitches;

FIG. 5 is a schematic view of the pressure face layer showing stitched micro-holes.

Detailed Description

The present invention is further described in the following description with reference to specific embodiments and the accompanying drawings, wherein the details are set forth in order to provide a thorough understanding of the present invention, but it is apparent that the present invention can be embodied in many other forms different from those described herein, and it will be readily appreciated by those skilled in the art that the present invention can be implemented in many different forms without departing from the spirit and scope of the invention.

The following discloses embodiments or examples of various implementations of the subject technology. Specific examples of components and arrangements are described below to simplify the present disclosure, but these are merely examples and do not limit the scope of the invention. For example, if a first feature is formed over or on a second feature described later in the specification, this may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact. Additionally, reference numerals and/or letters may be repeated among the various examples throughout this disclosure. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Further, when a first element is described as being coupled or coupled to a second element, the description includes embodiments in which the first and second elements are directly coupled or coupled to each other, as well as embodiments in which one or more additional intervening elements are added to indirectly couple or couple the first and second elements to each other.

It should be noted that fig. 1-5 are exemplary only, are not drawn to scale, and should not be construed as limiting the scope of the invention as actually claimed.

A typical fan blade 900 is shown in FIGS. 1, 2, and 3 and includes a leading edge 91, a trailing edge 92, a blade tip 93, a dovetail 94, and a blade face. The blade surface is the outer surface of the fan blade 900 and is divided into a pressure surface 1a and a suction surface 3 a.

As shown in fig. 2, the fan blade 900 is formed by stacking different material layers along the thickness direction thereof, specifically, the fan blade 900 includes a pressure surface layer 1, an intermediate portion 2, and a suction surface layer 3; the pressure surface layer 1 is provided with a pressure surface 1a, and the suction surface layer 3 is provided with a suction surface 3 a; the pressure surface layer 1, the intermediate portion 2, and the suction surface layer 3 are sequentially connected in a stacked manner in the thickness direction of the fan blade 900.

To avoid delamination of the pressure facing 1, the intermediate portion 2 and the suction facing 3 upon impact to the fan blade 900, in the embodiment shown in fig. 2, the fan blade 900 further comprises a leading edge layer 4, the leading edge layer 4 being connected to the leading edge of the intermediate portion 2; the suction surface layer 3 includes a main body portion 31 and an edge portion 32; in the circumferential direction of the intermediate portion 2, both ends of the leading edge layer 4 are connected to the front end of the edge portion 32 and the pressure surface layer 1, respectively, and the rear end of the edge portion 32 is connected to the main body portion 31; wherein the pressure face layer 1, the leading edge layer 4 and the edge portion 32 are made of a first density material.

More specifically, the pressure facing layer 1, the leading edge layer 4, and the edge portion 32 are integrally formed. The outer surfaces of the main body portion 31 and the edge portion 32 are combined into a suction surface 3 a.

In an embodiment of the invention, the leading edge 91 is located forward of the trailing edge 92. The circumferential direction of the intermediate portion 2 refers to a direction around the intermediate portion 2 in fig. 2. The first density material may be a metal, such as a titanium alloy.

Due to the arrangement of the front layer 4, seams between two sides of the middle part 2 in the thickness direction of the fan blade 900 and the pressure surface layer 1 and the suction surface layer 3 respectively are not directly exposed, when the fan blade is impacted by birds, the seams are not directly impacted, and the fan blade 900 is not easily layered, so that the fan blade 900 has the advantages of high strength and difficulty in layering due to impact.

To further strengthen fan blade 900, fan blade 900 also includes stitching 5; the stitches 5 penetrate the pressure surface layer 1, the intermediate portion 2, and the edge portion 32 in the thickness direction of the fan blade 900 to integrally connect the pressure surface layer 1, the intermediate portion 2, and the edge portion 32.

Since the pressure face layer 1 and the edge portion 32 are both made of the first density material and therefore have the same strength, the sewing line 5 can stably fix the intermediate portion 2 inside the pressure face layer 1, the front edge layer 4, and the edge portion 32, thereby improving the structural strength of the front edge 91 of the fan blade 900. The stitches 5 may be made of carbon fibers, aramid fibers, glass fibers, metal wires or the like.

With continued reference to fig. 2, 3, 4, the intermediate portion 2 comprises a plurality of intermediate layers 2 a; the intermediate layers 2a are sequentially stacked and connected in the thickness direction of the fan blade 900; the front edge of each intermediate layer 2a is connected to the front edge layer 4; wherein two adjacent intermediate layers 2a are made of a first and a second density material, respectively, and the intermediate layer 2a connected to the pressure face layer 1 is made of the second density material. More specifically, the density of the first density material is greater than the density of the second density material. The above-described approach helps reduce the weight of the fan blade 900 and also ensures the structural strength of the fan blade 900.

The second density material may be a composite material. The number of the layering layers, the thickness of each layer and the change of the thickness of each layer in the embodiment can be obtained through calculation, comprehensive optimization, such as pneumatics, strength and the like.

In a more specific embodiment, the number of intermediate layers 2a is odd, and the main body portion 31 is made of a first density material; as shown in fig. 2, 3 and 4, the number of the intermediate layer 2a is 3, and the main body portion 31, the edge portion 32, the leading edge layer 4 and the pressure face layer 1 are all made of the first density material.

In an embodiment not shown, the intermediate portion 2 is even in number and the main portion 31 is made of a second density material. If the number of layers of the intermediate layer 2a is 4, the main body portion 31 is made of the second density material.

With continued reference to fig. 4, suture 5 includes a first line portion 5a and a second line portion 5 b; the first line portion 5a penetrates the pressure surface layer 1, the intermediate portion 2, and the edge portion 32 in the thickness direction of the fan blade 900; the second line portion 5b penetrates the pressure surface layer 1, the intermediate portion 2, and the body portion 31 in the thickness direction of the fan blade 900 to integrally connect the pressure surface layer 1, the intermediate portion 2, and the body portion 31.

The first string portion 5a and the second string portion 5b may be provided separately, but from the viewpoint of improving the structural strength, the terminal end of the first string portion 5a and the starting end of the second string portion 5b are connected to each other in the path of the suture 5 so that the first string portion 5a and the second string portion 5b can receive force as a whole.

With continued reference to fig. 4, in the thickness direction of the fan blade 900, the first line portion 5a and/or the second line portion 5b extend from the suction surface 3a through the fan blade 900 to the pressure surface 1a, from the pressure surface 1a through the fan blade 900 to the suction surface 3 a; and/or

The first line portion 5a and/or the second line portion 5b extend from the pressure surface 1a through the fan blade 900 to the suction surface 3a, and from the suction surface 3a through the fan blade 900 to the pressure surface 1a in the thickness direction of the fan blade 900.

The lines 5 penetrate the fan blade 900 in the thickness direction of the fan blade 900, and the paths penetrating the fan blade 900 at a time are not required to be parallel to each other, and the paths penetrating the fan blade 900 at a time may be angled so long as the first line portion 5a can penetrate the pressure surface layer 1, the intermediate portion 2, and the edge portion 32 when penetrating the fan blade 900, and the second line portion 5b can penetrate the pressure surface layer 1, the intermediate portion 2, and the main body portion 31 when penetrating the fan blade 900.

As shown in fig. 5, in order to facilitate the threading of the sewing thread 5, the pressure surface layer 1 and the edge portion 32 are provided with sewing micro-holes K through which the sewing thread 5 passes.

In another embodiment, the pressure surface layer 1, the middle layer 2a made of the first density material and the main body portion 31 made of the first density material are provided with stitching micropores K through which the stitching threads 5 pass.

The intermediate layer 2 made of the second density material and the main body portion 31 made of the second density material are easily penetrated, so that it is not necessary to provide sewing microholes.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make modifications and variations without departing from the spirit and scope of the present invention.