An aviation propeller lightning protection system

Abstract

The present invention discloses a design of an aviation propeller lightning protection system, which includes a blade and a hub, wherein the blade is evenly fixed around the hub; the blade includes a leading edge protection cover, an anti-icing belt, a blade, a blade root outer sleeve and a lightning protection webbing, the leading edge protection cover is fixedly bonded to the leading edge position of the blade; the anti-icing belt is fixedly connected to the guide edge of the blade and its two ends extend to the leading edge protection cover and the blade root position respectively; the blade root outer sleeve is fixed at the root of the blade; the top surface of the blade is the working surface, and the bottom surface is the non-working surface; the lightning protection webbing is fixedly laid on the working surface of the blade, and one end thereof extends to the blade root outer sleeve position, and the other end extends to the leading edge of the blade, and the corresponding positions of the leading edge protection cover and the blade are provided with perforations, and the other end of the lightning protection webbing passes through the perforations and is located on the non-working surface side of the blade; the blade root outer sleeve is mechanically connected to the hub through the blade sleeve. The present invention has a simple structure, good lightning protection effect when in use, and high safety performance.

Description

Technical Field

[0001] The invention relates to a propeller, in particular to a design of a lightning protection system for an aviation propeller. Background Art

[0002] Propeller aircraft fly at altitudes reaching 11,000 meters and must navigate through cloud cover to maintain normal flight. The propeller, the aircraft's primary propulsion system, is located at the front of the wing, exposed to the air. Its large diameter extends above the fuselage. Throughout its lifecycle, propellers are inevitably exposed to thunderstorms during takeoff and landing. Existing propellers have poor electrical conductivity, posing a high risk of lightning strikes.

[0003] Therefore, how to provide a lightning protection system design for aviation propellers is an urgent problem that those skilled in the art need to solve. Summary of the Invention

[0004] In view of this, the present invention provides a design of an aviation propeller lightning protection system, which has a good lightning protection effect.

[0005] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: A lightning protection system design for an aviation propeller, which includes a blade and a hub, wherein the blade is evenly fixed around the hub; the blade includes a leading edge protection cover, an anti-icing belt, a blade, a blade root outer sleeve and a lightning protection webbing, the leading edge protection cover has a V-shaped cross-section and is fixedly glued onto the leading edge of the blade; the anti-icing belt is fixedly connected to the leading edge of the blade and its two ends extend to the leading edge protection cover and the root position of the blade respectively; the blade root outer sleeve is fixedly located at the root of the blade; the top surface of the blade is a working surface and the bottom surface is a non-working surface; the lightning protection webbing is fixedly laid on the working surface of the blade, and one end thereof extends to the blade root outer sleeve position and the other end extends to the leading edge end position of the blade, the leading edge protection cover and the leading edge position of the blade are provided with a perforation, and the other end of the lightning protection webbing passes through the perforation and is located on the non-working surface side of the blade; a propeller sleeve is fixedly provided on the outer periphery of the blade root outer sleeve and is mechanically connected to the hub.

[0006] The beneficial effects of the present invention are as follows: the arrangement of the leading edge protection cover and the anti-icing belt makes the propeller blades have sufficient strength. When encountering hail weather, the propeller blades can smoothly pass through the hail area to protect the propeller blades from damage. A lightning protection webbing is arranged on the propeller blades, and its two ends are respectively connected to the propeller root outer sleeve and the leading edge protection cover. The propeller root outer sleeve is fixedly connected to the propeller sleeve, and the propeller sleeve is mechanically connected to the hub to complete the assembly of the blades. The lightning protection webbing connects the propeller blades, the hub and the fuselage shell, so that the propeller blades and the fuselage shell form conductors of equipotential. When passing through a minefield, lightning triggers the lightning protection webbing on the propeller blades. Since the fuselage and the propeller blades are conductively connected, no potential pressure difference is generated, and no current passes through the inside of the fuselage, thereby avoiding electric shock and increasing its flight safety.

[0007] Preferably, a brass sheet is provided between the lightning protection webbing on the non-working surface side of the blade and the leading edge protection cover, and the leading edge protection cover and the lightning protection webbing are fixedly bonded to both sides of the brass sheet.

[0008] Preferably, a webbing pressure plate is provided on the outer sleeve of the propeller root, and the webbing pressure plate fixes the lightning protection webbing to the outer sleeve of the propeller root through screws.

[0009] Preferably, the outer side surfaces of the webbing pressing plate and the screw are covered with a resin protective cover.

[0010] Preferably, the paddle blade is made of a lightweight composite material, the anti-icing strip is made of high-quality structural steel and has a V-shaped cross section, and is fixedly connected to the guide edge of the paddle blade.

[0011] Preferably, the lightning protection ribbon is a silver-plated copper wire braid.

[0012] Preferably, the leading edge protection cover is made of pure nickel material.

[0013] Preferably, the propeller sleeve and the propeller root outer sleeve are connected by threaded fitting, and both the propeller sleeve and the propeller root outer sleeve are made of alloy steel material with high electrical conductivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of a lightning protection system for aviation propellers according to the present invention;

[0015] Figure 2 Schematic diagram of a blade designed for an aviation propeller lightning protection system of the present invention Figure 1 ;

[0016] Figure 3 Schematic diagram of a blade designed for an aviation propeller lightning protection system of the present invention Figure 2 ;

[0017] Figure 4A partially enlarged schematic diagram of a blade designed for an aviation propeller lightning protection system according to the present invention;

[0018] Figure 5 This is a hub and blade assembly diagram designed for an aviation propeller lightning protection system of the present invention.

[0019] 1 propeller blade, 11 leading edge protection cover, 12 anti-icing belt, 13 propeller blade, 14 propeller root outer sleeve, 15 lightning protection webbing, 2 propeller hub, 3 brass sheet, 4 webbing pressure plate, 5 bearing, 6 propeller hub end face gear, 7 propeller sleeve. DETAILED DESCRIPTION

[0020] 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See the attached Figures 1 to 5 According to an embodiment of the present invention, an aviation propeller lightning protection system is designed, including a blade 1 and a hub 2, wherein the blade 1 is evenly fixed around the hub 2; the blade 1 includes a leading edge protection cover 11, an anti-icing belt 12, a blade 13, a propeller root outer sleeve 14 and a lightning protection webbing 15, wherein the leading edge protection cover 11 has a V-shaped cross section and is fixedly glued to the leading edge of the propeller blade 13; the anti-icing belt 12 is fixedly connected to the leading edge of the propeller blade 13 and its two ends extend to the leading edge protection cover 11 and the root of the propeller blade respectively; the propeller root outer sleeve 14 It is fixed at the root of the blade 13; the top surface of the blade 13 is the working surface, and the bottom surface is the non-working surface. The lightning protection webbing 15 is fixedly laid on the working surface of the blade 13, with one end extending to the position of the outer sleeve 14 at the root of the blade and the other end extending to the end of the leading edge of the blade. The leading edge protection cover 11 and the blade are provided with perforations, and the perforations are located in corresponding positions. The other end of the lightning protection webbing 15 passes through the perforations and is located on the non-working side of the blade 13. The outer periphery of the outer sleeve 14 at the root of the blade is fixedly connected to the paddle sleeve 7 and is mechanically connected to the hub 2. The specific connection between the blade and the hub can be adjusted to obtain different amounts of tension.

[0022] In some specific embodiments, a brass sheet 3 is arranged between the lightning protection tape on the non-working surface side of the blade 13 and the leading edge protection cover 11. The two sides of the brass sheet 3 are fixedly bonded to the leading edge protection cover 11 and the lightning protection tape 15 respectively. The brass sheet can improve the adhesion and conductivity of the lightning protection tape. The specific brass sheet is bonded using structural adhesive.

[0023] In other embodiments, a webbing pressing plate 4 is provided on the propeller root outer sleeve 14, and the webbing pressing plate 4 fixes the lightning protection webbing 15 to the propeller root outer sleeve 14 through screws, ensuring the conductive connection between the lightning protection webbing and the propeller hub to ensure the current path.

[0024] In other specific embodiments, the outer side surfaces of the webbing pressure plate 4 and the screw are covered with a resin protective cover, which connects the webbing pressure plate, the screw and the outer sleeve of the propeller root into one, effectively preventing the screw from loosening.

[0025] In other embodiments, the blades 13 are made of lightweight composite materials, and the anti-icing strips 12 are made of high-quality structural steel with a V-shaped cross-section. They are fixedly bonded to the leading edge of the blades 13. In hailstorms, the anti-icing strips protect the blades from damage, thereby extending their service life.

[0026] Specifically, the lightning protection ribbon 15 is a silver-plated copper wire braided ribbon to improve its electrical conductivity, and conductive glue is used when bonding the lightning protection ribbon to the working surface.

[0027] Specifically, when the lightning protection webbing is used, the resistance between the leading edge protection cover and the propeller root outer sleeve is less than 5 ohms.

[0028] In some other specific embodiments, the leading edge protection cover 11 is made of pure nickel material, which has good conductivity and high strength.

[0029] Specifically, the propeller sleeve 7 and the propeller root outer sleeve 14 are connected by threaded fitting, and both the propeller sleeve 7 and the propeller root outer sleeve 14 are made of alloy steel material with high electrical conductivity.

[0030] The present invention provides a lightning protection system for aircraft propellers. The blades are constructed of lightweight composite materials to ensure structural performance. Highly conductive lightning protection tape is applied to the blades, electrically connecting them to the hub. When passing through a minefield, lightning current strikes the blades, and the tape quickly transmits the current to the aircraft's outer shell. This creates an equipotential relationship between the outer shell and the blades, preventing current from passing through the interior of the aircraft. This reduces the risk of electric shock and improves aircraft safety. In hailstorms, the anti-icing tape on the blade guide edge can break up hailstones and protect the blades.

[0031] As for the devices and methods of use disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the methods.

[0032] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An aviation propeller lightning protection system, comprising blades (1) and a hub (2), wherein the blades (1) are evenly fixed around the hub (2); characterized in that: The blade (1) includes a blade (13), a leading edge protection cover (11), an anti-icing belt (12), a blade root outer sleeve (14) and a lightning protection belt (15), wherein the top surface of the blade (13) is a working surface and the bottom surface is a non-working surface; the leading edge protection cover (11) is fixedly glued to the leading edge end position of the blade (13); the anti-icing belt (12) is fixedly connected to the guide edge of the blade (13) and its two ends extend to the leading edge protection cover (11) and the root position of the blade respectively; the blade root outer sleeve (14) is fixedly located at the root of the blade (13); the lightning protection belt (15) is fixedly laid on the working surface of the blade (13), and one end of it extends to the position of the blade root outer sleeve (14) and the other end extends to the blade The leading edge end position of the propeller blade is provided with a perforation on the leading edge protection cover (11) and the leading edge of the propeller blade, and the other end of the lightning protection webbing (15) passes through the perforation and is located on the non-working surface side of the propeller blade (13); a brass sheet (3) is provided between the lightning protection webbing on the non-working surface side of the propeller blade (13) and the leading edge protection cover (11), and the two sides of the brass sheet (3) are fixedly bonded to the leading edge protection cover (11) and the lightning protection webbing (15), a propeller sleeve (7) is fixedly provided on the outer periphery of the propeller root outer sleeve (14), and the propeller sleeve (7) is mechanically connected to the propeller hub (2); a webbing pressure plate (4) is provided on the propeller root outer sleeve (14), and the webbing pressure plate (4) fixes the lightning protection webbing (15) to the propeller root outer sleeve (14) by screws.

2. The aviation propeller lightning protection system according to claim 1, characterized in that: The outer side surfaces of the webbing pressing plate (4) and the screw are covered with a resin protective cover.

3. The aviation propeller lightning protection system according to claim 1, characterized in that: The paddle blade (13) is made of a lightweight composite material, and the anti-icing strip (12) is made of high-quality structural steel and has a V-shaped cross section, and is fixedly bonded to the guide edge of the paddle blade (13).

4. The aviation propeller lightning protection system according to claim 1, characterized in that: The lightning protection ribbon (15) is a silver-plated copper wire braid.

5. The aviation propeller lightning protection system according to claim 1, characterized in that: The leading edge protection cover (11) is made of pure nickel material.

6. The aviation propeller lightning protection system according to claim 1, characterized in that: The paddle sleeve (7) and the paddle root outer sleeve (14) are connected by threaded fit, and both the paddle sleeve (7) and the paddle root outer sleeve (14) are made of alloy steel material with high electrical conductivity.

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