Fan blade and aircraft engine including the same

Abstract

The present invention discloses a fan blade and an aircraft engine including the same, wherein the fan blade includes a blade portion and a metal leading edge, wherein the blade portion is made of composite material, a receiving groove is provided in the middle of the leading edge of the blade portion, the receiving groove penetrates along the thickness direction of the fan blade, and the metal leading edge is located in the receiving groove. A metal leading edge is provided in the middle of the leading edge of the blade portion, so that the middle of the leading edge of the fan blade is completely composed of metal to improve the impact resistance, and in the area of ​​the fan blade that is less affected by bird strikes, titanium alloy is not used alone, and can even be all composite materials, thereby reducing the proportion of titanium alloy in the fan blade, thereby reducing the weight of the fan blade, thereby taking into account both strength performance and weight reduction effect, and, compared with the fan blade with an edge-wrapped structure, the fan blade of this scheme has a simpler structure and is less difficult to process.

Description

Technical Field

[0001] The present invention relates to the field of aeroengines, and in particular to a fan blade and an aeroengine comprising the same. Background Art

[0002] Large-sized, lightweight fan blades are one of the key parts of high-bypass turbofan engines. At present, there are two main solutions for lightweight high-bypass fan blades that have been successfully applied to aircraft engines internationally. One is R&R's pure titanium alloy hollow fan blades, and the other is GE's composite blades with metal reinforced edges and edging. If the equivalent hollow ratio (actual blade weight / weight of solid titanium alloy blades of the same size) is used to measure the weight reduction effect of lightweight fan blades, R&R's all-titanium alloy hollow blades have achieved a 40% weight reduction (ie, actual hollow ratio), while GE's composite material-titanium alloy edging blades have achieved a weight reduction of more than 60% of the equivalent hollow ratio. Due to the better weight reduction effect, the hybrid structure of composite materials and metals has become the mainstream of the development of lightweight high-bypass fan blades of major engine companies. The metal part of the hybrid structure blade is mainly used to enhance the impact strength of the blade.

[0003] Existing composite blades abroad use titanium alloy edging structures to enhance the impact resistance of the blades, and the titanium alloy edging is fixed to the composite blade body by gluing. Since the metal reinforcement edge design of the composite fan currently used is limited by traditional processing technology, only a very small number of suppliers in the world have the ability to process metal reinforcement edges, and its technical threshold and cost remain high. In addition, the complex shape of the blades makes the processing of braided composite materials extremely difficult, which has become a research and development bottleneck and is difficult to break through in a short period of time. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defect in the prior art that blades with good impact resistance are difficult to manufacture, and to provide a fan blade and an aircraft engine including the same.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] A fan blade, comprising:

[0007] A blade portion, the blade portion is made of a composite material, a receiving groove is provided in the middle of the leading edge of the blade portion, and the receiving groove penetrates along the thickness direction of the fan blade;

[0008] A metal front edge is located in the receiving groove.

[0009] In this solution, a metal leading edge is provided in the middle of the leading edge of the blade portion, so that the middle of the leading edge of the fan blade is completely made of metal to improve the impact resistance, while in the areas of the fan blade that are less affected by bird strikes, such as the leading edge tip area and the root area of ​​the fan blade, metal (such as titanium alloy) is not used alone, and can even be made entirely of composite materials, thereby reducing the proportion of metal in the fan blade, thereby reducing the weight of the fan blade, and at the same time strengthening the fan blade at a local position to keep the fan blade from being damaged under the bird strike load, meeting the fan blade anti-bird strike design requirements, thereby taking into account both strength performance and weight reduction effects, and, compared with fan blades with an edge-wrapped structure, the fan blade of this solution has a simpler structure and is less difficult to process. Preferably, the metal leading edge is a titanium alloy.

[0010] Preferably, the fan blade further comprises a metal core, wherein the metal core is embedded in the blade portion, and the blade portion covers the metal core at least in a thickness direction of the fan blade.

[0011] In this solution, the metal core and the blade surface together form a sandwich structure, which can reduce the weight of the fan blade while ensuring the strength of the fan blade.

[0012] Preferably, the metal core comprises a first reinforcement portion extending from a rear portion of the metal leading edge to a trailing edge of the fan blade.

[0013] In this solution, the first reinforcement part is embedded in the blade surface to improve the strength and rigidity of the fan blade, and the first reinforcement part is connected to the metal leading edge to improve the connection strength between the metal leading edge and the blade surface. The first reinforcement part can extend to the middle of the blade surface, that is, there is a gap between the first reinforcement part and the trailing edge of the fan blade, while ensuring the impact resistance of the blade, the proportion of the first metal reinforcement part in the fan blade is reduced.

[0014] Preferably, the metal core comprises a second reinforcement portion, wherein the second reinforcement portion extends from a first end of the metal leading edge toward a blade tip of the fan blade, and the first end of the metal leading edge is an end close to the blade tip of the fan blade.

[0015] In this solution, the second reinforcement portion can improve the impact resistance of the leading edge tip portion of the fan blade, and the second reinforcement portion is connected to the metal leading edge, thereby improving the connection reliability between the metal leading edge and the fan blade.

[0016] Preferably, the metal core comprises a third reinforcement portion, wherein the third reinforcement portion extends from the second end of the metal leading edge toward the root of the fan blade, and the second end of the metal leading edge is an end close to the root of the fan blade.

[0017] In this solution, the third reinforcement portion can improve the impact resistance of the leading edge root portion of the fan blade, and the third reinforcement portion is connected to the metal leading edge, thereby improving the connection reliability between the metal leading edge and the fan blade.

[0018] Preferably, the metal core comprises a fourth reinforcement portion, wherein the fourth reinforcement portion is at the tip of the fan blade and extends from the leading edge toward the trailing edge of the fan blade along the chord direction of the fan blade.

[0019] In this solution, the fourth reinforcement portion can reinforce the tip of the fan blade. Since the part of the tip close to the leading edge is more easily impacted than the part close to the trailing edge, the fourth reinforcement portion extends from the leading edge, that is, the fourth reinforcement portion is preferentially arranged near the leading edge.

[0020] Preferably, the metal core comprises a fifth reinforcement portion, and the fifth reinforcement portion extends from the fourth reinforcement portion toward the root of the fan blade.

[0021] In this solution, the extension direction of the fifth reinforcement part is staggered with the extension direction of the fourth reinforcement part, thereby providing support for the fan blade in different directions, which is beneficial to the reinforcement of the structure. The fifth reinforcement part can be spaced apart from the root of the fan blade, thereby reducing the metal proportion in the fan blade to reduce the weight of the fan blade, while also meeting the reinforcement requirements.

[0022] Preferably, the fifth reinforcement portion extends along the trailing edge of the fan blade.

[0023] In this solution, the edge of the fan blade is relatively weak, so the edge of the fan blade is strengthened first, which can increase the rigidity and strength of the thinner position of the blade and increase the bird strike resistance of the blade. Specifically, this solution gives priority to strengthening the trailing edge of the fan blade.

[0024] Preferably, there are a plurality of the fifth reinforcing parts, and adjacent fifth reinforcing parts are arranged at intervals.

[0025] In this solution, multiple fifth reinforcements can better strengthen the fan blade. At the same time, since there are intervals between the fifth reinforcements, the proportion of metal parts in the fan blade can be reduced, which is beneficial to weight reduction. The length and width of each fifth reinforcement can be changed according to the design of the fan blade. For example, the size of the fifth reinforcement located at the edge of the fan blade can be larger to strengthen the weak part of the fan blade.

[0026] Preferably, the fourth reinforcement portion extends from the leading edge of the fan blade to the trailing edge of the fan blade.

[0027] In this solution, the fourth reinforcement portion at the tip of the fan blade extends to the trailing edge of the blade, which will not cause damage to the trailing edge of the blade under the impact load of bird strike, thereby increasing the bird strike resistance of the blade.

[0028] Preferably, the metal core comprises a sixth reinforcement portion, and the sixth reinforcement portion extends from the first reinforcement portion toward the trailing edge of the fan blade.

[0029] In this solution, the sixth reinforcement portion can strengthen the structure of the middle part of the fan blade. The sixth reinforcement portion can be strip-shaped, which will not take up too much space while strengthening the structure, and is beneficial to reducing the weight of the fan blade.

[0030] Preferably, there are a plurality of the sixth reinforcement parts, and adjacent sixth reinforcement parts are arranged at intervals.

[0031] In this solution, multiple sixth reinforcement parts can better strengthen the fan blade. At the same time, since there are intervals between the sixth reinforcement parts, the proportion of metal parts in the fan blade can be reduced, which is conducive to weight reduction. The length and width of each sixth reinforcement part can be changed according to the design of the fan blade.

[0032] Preferably, one of the sixth reinforcement portions extends along the tip of the fan blade, and the length of the sixth reinforcement portion located at the tip is greater than the lengths of other sixth reinforcement portions.

[0033] In the present solution, the fan blade at the tip is relatively thin, and its rigidity and strength are relatively weak. The sixth reinforcement portion at the tip extends to the trailing edge of the blade to increase the rigidity and strength of the tip and trailing edge. When the fan blade is hit by a bird, the swing of the blade is reduced, thereby reducing the possibility of damage to the trailing edge of the fan blade.

[0034] Preferably, the metal core and the metal leading edge are integrally arranged.

[0035] In this solution, the metal core can provide support and connection for the metal leading edge, so that the metal leading edge can be firmly fixed to the blade surface. Preferably, the various reinforcement parts of the entire metal core can be integrally arranged.

[0036] Preferably, the accommodating groove is located between the tip and the root of the fan blade.

[0037] In this solution, the metal leading edge does not extend to the tip and tenon (root) of the fan blade, because these tip and tenon positions are areas that birds cannot hit. Under the condition of meeting the bird strike resistance, less metal material is used at the tip and tenon of the fan blade, and increasing the use of composite materials can further reduce the weight of the entire fan blade. In some embodiments, the receiving groove extends to the root of the fan blade, and accordingly, the leading edge root of the fan blade is entirely a metal structure.

[0038] An aircraft engine comprises the fan blades as described above.

[0039] In the present solution, the aircraft engine using the above-mentioned fan blades has good impact resistance, can meet the needs of dealing with bird strikes, and reduces the proportion of metal (such as titanium alloy) in the fan blades, thereby reducing the weight of the fan blades, and can take into account both strength performance and weight reduction effects. Moreover, compared with the fan blades with a hemming structure, the fan blades of this solution have a simpler structure and are less difficult to process, thereby reducing the cost of the aircraft engine.

[0040] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0041] The positive progressive effects of the present invention are: the present invention provides a fan blade and an aircraft engine including the same. The fan blade is a hybrid structure fan blade, specifically a lightweight fan blade composed of a metal structure and a composite material through a specific connection method. The weight of the hybrid structure fan blade is mainly composed of the weight of the metal structure and the weight of the composite material. Under the condition of meeting the bird strike impact, the greater the proportion of the composite material, the smaller the weight of the fan blade, which can improve the hollowness of the fan blade. The fan blade of the present invention reduces the metal content in the blade by reducing the proportion of metal at the tip and the tenon (root) under the condition of meeting the bird strike impact load, thereby further reducing the weight of the entire fan blade. This metal core can be manufactured by methods such as machining, forging or additive manufacturing. Specifically includes the following positive progressive effects:

[0042] (1) In the area of ​​the leading edge of the fan blade where birds cannot strike, metal materials are not used alone. Instead, a layer of metal core is sandwiched between composite materials, or this area is made entirely of composite materials, thereby reducing the volume of metal materials (such as titanium alloy), increasing the amount of composite materials used, and reducing the weight of the entire hybrid structure fan blade;

[0043] (2) In the area near the tenon on the leading edge of the fan blade, since birds cannot hit it, composite materials are used in combination with metal materials or composite materials are used alone, while meeting the static strength requirements, to reduce the proportion of metal materials in the entire fan blade and further reduce the weight of the fan blade;

[0044] (3) The metal core portion at the tip of the fan blade extends to the trailing edge of the blade, or is wider than the metal core portion in the middle of the entire fan blade, thereby increasing the stiffness of the entire tip of the fan blade, making it less likely to cause damage to the composite material at the trailing edge of the blade under bird strike loads, and improving the bird strike resistance of the fan blade;

[0045] (4) The metal core in the fan blade area can be designed to have different widths horizontally at different blade body heights, and can also be designed to have different widths vertically at different blade tip widths, thereby increasing the bird strike resistance of the fan blade while reducing the weight of the fan blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a schematic diagram of the structure of the fan blade of Example 1 of the present invention.

[0047] Figure 2 for Figure 1 Schematic cross section at AA.

[0048] Figure 3 for Figure 1 Schematic cross section at BB.

[0049] Figure 4 for Figure 1 Schematic cross section at CC.

[0050] Figure 5 for Figure 1 Schematic cross section at DD.

[0051] Figure 6 This is a schematic diagram of the internal structure of the fan blade of Example 1 of the present invention.

[0052] Figure 7 This is a schematic diagram of the internal structure of the fan blade of Example 2 of the present invention.

[0053] Figure 8 It is a schematic diagram of the partial structure of the fan blade of Example 3 of the present invention.

[0054] Fig. 9 Schematic diagram of the internal structure of the fan blade of Example 4 of the present invention.

[0055] Description of Reference Numerals

[0056] Leaf surface 1

[0057] Metal Front 2

[0058] Metal core 3

[0059] The first reinforcement portion 31

[0060] The second reinforcement portion 32

[0061] The third reinforcement part 33

[0062] Fourth reinforcement portion 34

[0063] Fifth reinforcement part 35

[0064] Sixth reinforcement part 36

[0065] Leading Edge 10

[0066] Tip 20

[0067] Leaf 30

[0068] Trailing edge 40

[0069] Tenon 50 DETAILED DESCRIPTION

[0070] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0071] Example 1

[0072] This embodiment provides a fan blade and an aircraft engine. The fan blade has five regions: a leading edge 10, a blade tip 20, a blade surface 30, a trailing edge 40, and a tenon 50 (root). Figure 1 , Figure 2 , Figure 5 As shown, the fan blade includes a blade surface 30 portion 1 and a metal leading edge 2, wherein the blade surface 30 portion 1 is made of composite material, and a receiving groove is provided in the middle of the leading edge 10 of the blade surface 30 portion 1, the receiving groove penetrates along the thickness direction of the fan blade, and the metal leading edge 2 is located in the receiving groove. In this embodiment, the receiving groove is located between the tip 20 and the root of the fan blade, that is, the metal leading edge 2 is provided in the middle of the leading edge 10 of the blade portion, so the middle of the leading edge 10 of the fan blade is completely composed of metal to improve the impact resistance, and in the area of ​​the fan blade that is less affected by bird strikes, such as the tip 20 area and the root area of ​​the leading edge 10 of the fan blade, metal (such as titanium alloy) is not used alone, and can even be all composite materials, thereby reducing the proportion of metal in the fan blade, thereby reducing the weight of the fan blade, and at the same time strengthening the local position of the fan blade to keep the fan blade from being damaged under the bird strike load, meet the anti-bird strike design requirements of the fan blade, thereby taking into account both strength performance and weight reduction effect, and, compared with the fan blade with an edge wrapping structure, the fan blade of this scheme has a simpler structure and lower processing difficulty. Preferably, the metal leading edge 2 is made of titanium alloy.

[0073] like Figures 2 to 5 As shown, the fan blade further includes a metal core 3, which is embedded in the blade surface 30 portion 1, and the blade surface 30 portion 1 covers the metal core 3 at least in the thickness direction of the fan blade. The metal core 3 and the blade surface 30 portion 1 together form a sandwich structure, which can reduce the weight of the fan blade while ensuring the strength of the fan blade. Preferably, the material of the metal core 3 is consistent with the material of the metal leading edge 2, and further preferably, the metal core 3 is also a titanium alloy.

[0074] Among them, the size of the metal core 3 in the thickness direction of the fan blade can be smaller than the metal leading edge 2 (that is, a step is formed between the metal core 3 and the metal leading edge 2), further reducing the weight of the fan blade while ensuring that the metal core 3 is covered with composite materials.

[0075] As a preferred embodiment, the metal core 3 is integrally provided with the metal leading edge 2. The metal core 3 can provide support and connection for the metal leading edge 2, so that the metal leading edge 2 can be firmly fixed to the blade surface 30 part 1, and preferably, each reinforcement part of the entire metal core 3 can be integrally provided.

[0076] like Figure 6 As shown, in this embodiment, the metal core 3 includes a first reinforcement portion 31, a second reinforcement portion 32, a third reinforcement portion 33 and a fourth reinforcement portion 34. Among them, the first reinforcement portion 31 extends from the rear of the metal leading edge 2 to the trailing edge 40 of the fan blade. The first reinforcement portion 31 is embedded in the blade surface 30 portion 1 to improve the strength and rigidity of the fan blade. At the same time, the first reinforcement portion 31 is connected to the metal leading edge 2 to improve the connection strength between the metal leading edge 2 and the blade surface 30 portion 1. The first reinforcement portion 31 can extend to the middle of the blade surface 30 portion 1, that is, there is a distance between the first reinforcement portion 31 and the trailing edge 40 of the fan blade, which reduces the proportion of the first metal reinforcement portion 31 in the fan blade while ensuring the impact resistance of the blade.

[0077] The second reinforcement portion 32 extends from the first end of the metal leading edge 2 toward the blade tip 20 of the fan blade, and the first end of the metal leading edge 2 is an end close to the blade tip 20 of the fan blade. The second reinforcement portion 32 can improve the impact resistance of the blade tip 20 of the leading edge 10 of the fan blade, and the second reinforcement portion 32 is connected to the metal leading edge 2, thereby improving the connection reliability between the metal leading edge 2 and the fan blade.

[0078] The third reinforcement 33 extends from the second end of the metal leading edge 2 toward the root of the fan blade, and the second end of the metal leading edge 2 is an end close to the root of the fan blade. The third reinforcement 33 can improve the impact resistance of the root portion of the leading edge 10 of the fan blade, and the third reinforcement 33 is connected to the metal leading edge 2, thereby improving the connection reliability between the metal leading edge 2 and the fan blade. Specifically in this embodiment, there is a gap between the third reinforcement 33 and the root edge of the fan blade, that is, the third reinforcement 33 does not extend to the root edge, because the tenon 50 is an area where birds cannot hit or the probability of hitting is low. Under the condition of meeting the bird impact resistance, less titanium alloy is used at the tenon 50 of the fan blade, and increasing the use of composite materials can further reduce the weight of the entire fan blade.

[0079] The fourth reinforcement portion 34 is at the tip 20 of the fan blade, extending from the leading edge 10 of the fan blade toward the trailing edge along the chord direction of the fan blade. The fourth reinforcement portion 34 can strengthen the tip 20 of the fan blade. The fourth reinforcement portion 34 extends from the leading edge 10 of the fan blade to the trailing edge 40 of the fan blade. The fourth reinforcement portion 34 at the tip 20 of the fan blade extends to the trailing edge 40 of the blade. Under the impact load of a bird strike, the trailing edge 40 of the blade will not be damaged, thereby increasing the bird strike resistance of the blade.

[0080] This embodiment also provides an aircraft engine, which includes the fan blades as described above. The aircraft engine using the fan blades has good impact resistance, can meet the requirements of dealing with bird strikes, and can take into account both strength performance and weight reduction effects.

[0081] Example 2

[0082] like Figure 7 The example 2 of the present invention is shown. The fan blade provided in this example is basically the same as that in the example 1. The main difference is that the structure of the metal core 3 in this example is different from that in the example 1.

[0083] In this embodiment, the metal core 3 also includes a first reinforcement portion 31, a second reinforcement portion 32, a third reinforcement portion 33 and a fourth reinforcement portion 34. Among them, the fourth reinforcement portion 34 does not extend to the trailing edge 40 of the fan blade, but is spaced from the trailing edge 40. Since the portion of the blade tip 20 close to the leading edge 10 is more susceptible to impact than the portion close to the trailing edge, the fourth reinforcement portion 34 extends from the leading edge 10, that is, the fourth reinforcement portion 34 is preferentially arranged at a position close to the leading edge 10. By reducing the proportion of titanium alloy used at the blade tip 20 of the blade, the weight of the entire fan blade can be reduced. At the same time, these positions are where birds cannot hit, so the fan blade's ability to resist bird impact can be reduced while reducing its weight.

[0084] In addition, the metal core 3 of the present embodiment further includes a sixth reinforcement portion 36, which extends from the first reinforcement portion 31 toward the trailing edge 40 of the fan blade. The sixth reinforcement portion 36 can strengthen the structure of the middle portion of the fan blade, and the sixth reinforcement portion 36 can be strip-shaped, which can strengthen the structure without taking up too much space, and is conducive to reducing the weight of the fan blade.

[0085] The number of the sixth reinforcement parts 36 can be multiple, and the adjacent sixth reinforcement parts 36 are arranged at intervals. Multiple sixth reinforcement parts 36 can better strengthen the fan blade. At the same time, since there are intervals between the sixth reinforcement parts 36, the proportion of metal parts in the fan blade can be reduced, which is beneficial to weight reduction. The length and width of each sixth reinforcement part 36 can be changed in size according to the design of the fan blade. In this embodiment, the sixth reinforcement part 36 does not extend to the trailing edge 40, but only extends to the middle part of the blade, which is beneficial to weight reduction.

[0086] In addition, the fourth reinforcement portion 34 in this embodiment can also be regarded as a sixth reinforcement portion 36, and the length of the fourth reinforcement portion 34 is greater than the length of the other sixth reinforcement portions 36. The fan blade at the tip 20 is thinner, and the rigidity and strength are relatively weak. The sixth reinforcement portion 36 (i.e., the fourth reinforcement portion 34) at the tip 20 extends to the trailing edge 40 of the blade, which can increase the rigidity and strength of the tip 20 and the trailing edge 40 of the blade. When the fan blade is hit by a bird, the swing of the blade is reduced, and the possibility of damage to the trailing edge 40 of the fan blade is reduced.

[0087] Example 3

[0088] like Figure 8 The example 3 of the present invention is shown. The fan blade provided in this example is basically the same as that in the example 2. The main difference is that the structure of the metal core 3 in this example is different from that in the example 2.

[0089] In this embodiment, the metal core 3 also includes a first reinforcement portion 31 , a second reinforcement portion 32 and a sixth reinforcement portion 36 , but does not include a third reinforcement portion 33 and a fourth reinforcement portion 34 , and the sixth reinforcement portion 36 is not arranged in the blade tip 20 area.

[0090] Furthermore, in the present embodiment, the receiving groove extends to the root of the fan blade, and accordingly, the root of the leading edge 10 of the fan blade is entirely a metal structure, so there is no space for arranging the third reinforcement portion 33 .

[0091] Example 4

[0092] like Fig. 9 The example 4 of the present invention is shown. The fan blade provided in this example is basically the same as that in the example 1. The main difference is that the structure of the metal core 3 in this example is different from that in the example 1.

[0093] In this embodiment, the metal core 3 also includes a first reinforcement portion 31 , a second reinforcement portion 32 , a third reinforcement portion 33 and a fourth reinforcement portion 34 , wherein the fourth reinforcement portion 34 extends to the trailing edge 40 of the fan blade.

[0094] In addition, the metal core 3 also includes a fifth reinforcement portion 35, which extends from the fourth reinforcement portion 34 toward the root of the fan blade. The extension direction of the fifth reinforcement portion 35 is staggered with the extension direction of the fourth reinforcement portion 34, thereby providing support for the fan blade in different directions, which is beneficial to the reinforcement of the structure. The fifth reinforcement portion 35 can be spaced apart from the root of the fan blade, thereby reducing the proportion of metal in the fan blade to reduce the weight of the fan blade, while also meeting the reinforcement requirements.

[0095] A fifth reinforcement portion 35 extends along the trailing edge 40 of the fan blade. The edge of the fan blade is relatively weak, so the edge of the fan blade is strengthened first, which can increase the rigidity and strength of the thinner position of the blade and increase the bird strike resistance of the blade. Specifically, the present solution gives priority to strengthening the trailing edge 40 of the fan blade.

[0096] There are multiple fifth reinforcement parts 35, and adjacent fifth reinforcement parts 35 are arranged at intervals. Multiple fifth reinforcement parts 35 can better strengthen the fan blade. At the same time, since there are intervals between the fifth reinforcement parts 35, the proportion of metal parts in the fan blade can be reduced, which is beneficial to weight reduction. The length and width of each fifth reinforcement part 35 can be changed according to the design of the fan blade. For example, the size of the fifth reinforcement part 35 located at the edge of the fan blade can be larger to utilize the weak parts of the fan blade.

[0097] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A fan blade, characterized in that: The fan blade comprises: A blade portion, the blade portion is made of a composite material, a front edge of the blade portion is provided with a receiving groove, and the receiving groove penetrates along the thickness direction of the fan blade; A metal front edge, the metal front edge being located in the receiving groove; Wherein, the fan blade further comprises a metal core, the metal core is embedded in the blade portion, and the blade portion covers the metal core at least in the thickness direction of the fan blade; The metal core is integrally arranged with the metal leading edge; The metal core includes a first reinforcement portion in a strip shape in the longitudinal direction, the first reinforcement portion extends from the rear of the metal leading edge to the trailing edge of the fan blade, and the first reinforcement portion is connected to the metal leading edge; A fourth reinforcing portion in a strip shape is further extended laterally from the first reinforcing portion, and the fourth reinforcing portion extends along the chord direction of the fan blade at the tip of the fan blade; The metal core has a second reinforcement portion extending from the first end of the metal leading edge toward the tip of the fan blade, the first end of the metal leading edge is an end close to the tip of the fan blade, and the second reinforcement portion is connected to the first end of the metal leading edge; The blade portion further covers the second reinforcement portion on the blade tip side.

2. The fan blade according to claim 1, characterized in that: The metal core has a third reinforcement portion extending from the second end of the metal leading edge toward the root of the fan blade, and the second end of the metal leading edge is an end close to the root of the fan blade.

3. The fan blade according to claim 1, characterized in that: The metal core has a fifth reinforcement portion extending from the fourth reinforcement portion toward the root of the fan blade, and the fifth reinforcement portion is strip-shaped in the longitudinal direction.

4. The fan blade according to claim 3, characterized in that: The fifth reinforcement portion extends along the trailing edge of the fan blade.

5. The fan blade according to claim 3, characterized in that: There are multiple fifth reinforcement parts, and adjacent fifth reinforcement parts are arranged at intervals.

6. The fan blade according to claim 1, characterized in that: The fourth reinforcement portion extends from the leading edge of the fan blade to the trailing edge of the fan blade.

7. The fan blade according to claim 1, characterized in that: The metal core has a sixth reinforcement portion extending from the first reinforcement portion toward the trailing edge of the fan blade, and the sixth reinforcement portion is strip-shaped in the transverse direction.

8. The fan blade according to claim 7, characterized in that: There are multiple sixth reinforcement parts, and adjacent sixth reinforcement parts are arranged at intervals.

9. The fan blade according to claim 8, characterized in that: A sixth reinforcement portion extends along the tip of the fan blade, and the length of the sixth reinforcement portion located at the tip is greater than the lengths of other sixth reinforcement portions.

10. The fan blade according to claim 1, characterized in that: The receiving groove is located between the tip and the root of the fan blade.

11. An aircraft engine, characterized in that: The aircraft engine comprises a fan blade as claimed in any one of claims 1 to 10.

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