Carbon fiber propeller
By introducing intermediate ribs and D-beam structures into the carbon fiber propeller, combined with a hollow design, the problems of insufficient strength and excessive weight of existing carbon fiber propellers at high speeds have been solved, achieving a highly efficient and lightweight propeller blade design.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2026-04-03
AI Technical Summary
Existing carbon fiber propellers for powered parachutes and light aircraft have insufficient structural strength during high-speed operation or rapid acceleration and deceleration, leading to deformation or breakage, which affects work efficiency and safety. At the same time, existing solid-filled structures are heavy, have poor acceleration, and low work efficiency.
It adopts a carbon fiber propeller structure, with the upper and lower blades connected by a central rib to form a D-shaped and A-shaped beam structure. Combined with a carbon fiber or honeycomb composite shell, the interior is hollow and uses wooden or composite material ribs to improve compressive and torsional strength while maintaining lightweight.
The propeller's compression and torsional strength have been improved, its weight reduced, acceleration and efficiency enhanced, and counter-torque reduced, ensuring stability and safety during high-speed operation.
Smart Images
Figure CN224075758U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of novel carbon fiber propeller reinforcement structures for powered parachutes and light aircraft, and particularly to a carbon fiber propeller. Background Technology
[0002] Currently, carbon fiber propellers for powered parachutes and light aircraft, such as... Figure 1 As shown, the structural process generally involves a surface shell of carbon fiber and other composite materials, while the internal structure is divided into two types: one is a composite material shell with a hollow structure, such as... Figure 2 As shown, the surface is generally made of carbon fiber plus glass fiber mat, or a carbon fiber composite shell with a certain thickness, with a hollow structure in the middle. This structure can ensure the basic shape and also ensure the product's lightweight, but this structure has poor strength, causing the blades to deform under stress when the blades are running at high speed or accelerating and decelerating rapidly, affecting the propeller's working efficiency, and in severe cases, breaking during operation and endangering safety. The second type of structure is a composite material shell with a solid filling structure, such as... Figure 3 As shown, the surface is generally made of carbon fiber plus glass fiber mat, or a carbon fiber shell with a certain thickness, while the inside is filled with polyurethane foam or glass microspheres and resin mixture or other filling materials. Some relatively lightweight materials with certain filling functions are used to fill the inside of the blade to form a solid core structure. This structure ensures that the blade will not deform when it is subjected to force during high-speed rotation or rapid acceleration and deceleration, and the strength is significantly improved compared to the former. However, this type of blade is heavy, has poor acceleration, large anti-torque, and low working efficiency.
[0003] Therefore, we propose a carbon fiber propeller. Utility Model Content
[0004] To overcome the shortcomings of existing technologies, the purpose of this utility model is to provide a carbon fiber propeller. This structure ensures that the upper and lower surfaces of the propeller blade have a small compression coefficient and high compressive strength when under stress. A D-shaped beam is formed on the leading edge of the propeller blade to ensure torsional strength and improve the impact resistance of the propeller blade. Since the interior of the propeller blade is still hollow except for the rib beam, the weight of the propeller blade is reduced while ensuring high strength, the acceleration of the propeller blade is improved, the anti-torque is very small, and the working efficiency of the propeller is high.
[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:
[0006] A carbon fiber propeller includes a propeller blade, which is divided into upper and lower blade surfaces. The upper and lower blade surfaces are connected by one or more ribs in the middle, making the upper and lower blade surfaces a single unit. The upper and lower blade surfaces are made of carbon fiber or carbon fiber and honeycomb composite material. The ribs are made of wood, carbon fiber or other composite materials. A front sill is provided at the front of the propeller blade and a rear sill is provided at the rear of the propeller blade. The front sill and the ribs form a D-shape, and the rear sill and the ribs form an A-shape.
[0007] Furthermore, the wooden rib beams are flat "I" shaped beams.
[0008] Furthermore, the carbon fiber and composite material ribs are in the shape of a "1" or "I".
[0009] Furthermore, the propeller blades have a hollow internal structure.
[0010] In summary, this utility model has the following beneficial effects:
[0011] 1. This structure ensures that the upper and lower surfaces of the blade have a small compression coefficient and high compressive strength when the blade is under stress. A D-shaped beam is formed on the blade's leading edge to ensure torsional strength and improve the blade's impact resistance. Since the blade's interior is still hollow except for the rib beam, the blade's weight is reduced while ensuring high strength, thus improving the blade's acceleration. The anti-torsion force is very small, resulting in high propeller efficiency.
[0012] 2. The product maintains a stable shape during operation, has good acceleration and deceleration performance, is lightweight, has high structural strength, minimal acceleration deformation, high engine efficiency conversion, and low counter-torque. Attached Figure Description
[0013] Figure 1 This is an outline drawing of a carbon fiber composite powered parachute and a light aircraft propeller blade (the blade consists of two, three, or more identical blades; the image below shows a half-blade as an example for illustration).
[0014] Figure 2 It is a cross-sectional schematic diagram of a hollow internal structure;
[0015] Figure 3 This is a cross-sectional structural diagram of an existing carbon fiber composite propeller blade with a solid internal structure filled with material.
[0016] Figure 4-1 This is a schematic diagram of a novel carbon fiber blade with wooden ribs structure.
[0017] Figure 4-2 This is a schematic diagram of a novel carbon fiber propeller blade with carbon fiber ribs.
[0018] Figure 5-1 This is a partial perspective view of the blade;
[0019] Figure 5-2 This is an overall view of the propeller blades.
[0020] In the diagram, 1 is the propeller blade; 2 is the rib; 3 is the front sprocket; and 4 is the rear sprocket. Detailed Implementation
[0021] The present invention will be further described in detail below with reference to the accompanying drawings.
[0022] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific part, respectively.
[0023] Reference Figure 4-1 , Figure 4-2 As shown, a carbon fiber propeller 2 in a preferred embodiment of the present invention includes a propeller blade 1, which is divided into upper and lower blades. The upper and lower blades of the propeller blade 1 are connected by one or more ribs 2 in the middle, making the upper and lower blades a single unit. The upper and lower blades of the propeller blade 1 are made of carbon fiber or carbon fiber and honeycomb composite material. The ribs 2 are made of wood, carbon fiber or other composite materials. A front sill 3 is provided at the front of the propeller blade 1, and a rear sill 4 is provided at the rear of the propeller blade 1. The front sill 3 and the ribs 2 form a D-shape, and the rear sill 4 and the ribs 2 form an A-shape.
[0024] Reference Figure 4-1 As shown, the wooden rib beam 2 is a flat "1" shaped beam.
[0025] The first type of wooden material ribbed structure
[0026] Wooden Rib 2 Structure: First, pre-form the wooden rib 2. The material can be made of wood materials such as aerospace plywood, basswood plywood, pine, paulownia, etc., to create the longitudinal internal cross-sectional shape of the blade. The thickness of the wooden rib can be determined according to the length, size, and strength requirements of the blade, as well as the arrangement and number of ribs within the blade. Figure 4-1 (The locations and quantities of one beam and multiple beams are listed respectively.) Next, using carbon fiber and other composite materials, the upper and lower blades of the propeller are manufactured through processes such as molding, vacuum casting, and hand lay-up. Before the upper and lower blades are molded together... Figure 4-1Apply structural adhesive or other bonding material to both sides of the wooden rib beam 2, place the wooden beam in the corresponding position, and then close the mold of the blade. After mold closing, the upper and lower surfaces of the blade are simultaneously combined with the wooden rib beam 2 to form an integral structure. This wooden beam structure molding process is simple, low-cost, and highly efficient, suitable for small-batch production and for blades with less stringent strength requirements. Its advantages include good blade acceleration, light weight, simple structure, easy molding, and moderate strength.
[0027] Reference Figure 4-2 As shown, the carbon fiber and composite material rib beam 2 is a "1" or "I" shaped beam.
[0028] The second type of rib structure using carbon fiber and other composite materials
[0029] Carbon fiber and other composite material rib beam 2 structure: This structure can be divided into three molding methods. First, pre-form the carbon fiber or other composite material rib beam 2. The material can be made of carbon fiber, glass fiber, honeycomb, and other composite materials to form the longitudinal internal cross-sectional shape of the blade. The thickness of the wooden beam can be determined according to the length, size, and strength requirements of the blade, as well as the arrangement and number of beams in the blade. Figure 5-2 The locations and quantities of one beam and multiple beams are listed separately. Next, using carbon fiber and other composite materials, the upper and lower blades of the propeller are fabricated through processes such as molding, vacuum casting, and hand lay-up. Before the upper and lower blades are molded together... Figure 4-2 The carbon fiber and other composite material ribs 2 are coated with structural adhesive or other bonding materials on both sides. The ribs 2 are then placed in the corresponding positions, and the blades are molded together. After mold closing, the upper and lower surfaces of the blades are simultaneously bonded to the carbon fiber and other composite material beams to form an integral structure. This beam structure molding process is simple, low-cost, and highly efficient, making it suitable for small-batch production and for blades with high strength requirements. Its advantages include good blade acceleration, light weight, simple structure, easy molding, and excellent strength.
[0030] Reference Figure 4-1 , Figure 4-2 As shown, the propeller blade 1 has a hollow internal structure.
[0031] Specific implementation process: The first type of wooden material, rib beam 2 structure
[0032] Wooden Rib 2 Structure: First, pre-form the wooden rib 2. The material can be made of wood materials such as aerospace plywood, basswood plywood, pine, paulownia, etc., to create the longitudinal internal cross-sectional shape of the blade. The thickness of the wooden rib can be determined according to the length, size, and strength requirements of the blade, as well as the arrangement and number of ribs within the blade. Figure 4-1(The locations and quantities of one beam and multiple beams are listed respectively.) Next, using carbon fiber and other composite materials, the upper and lower blades of the propeller are manufactured through processes such as molding, vacuum casting, and hand lay-up. Before the upper and lower blades are molded together... Figure 4-1 Apply structural adhesive or other bonding material to both sides of the wooden rib beam 2, place the wooden beam in the appropriate position, and then mold the blades together. After molding, the upper and lower surfaces of the blades simultaneously attach to the wooden rib beam 2 to form an integral structure. This wooden beam structure molding process is simple, low-cost, and highly efficient, making it suitable for small-batch production and for blades where product strength requirements are not high. Its advantages include good blade acceleration, light weight, simple structure, easy molding, and moderate strength.
[0033] The second type of rib structure using carbon fiber and other composite materials
[0034] Carbon fiber and other composite material rib beam 2 structure: This structure can be divided into three molding methods. First, pre-form the carbon fiber or other composite material rib beam 2. The material can be made of carbon fiber, glass fiber, honeycomb, and other composite materials to form the longitudinal internal cross-sectional shape of the blade. The thickness of the wooden beam can be determined according to the length, size, and strength requirements of the blade, as well as the arrangement and number of beams in the blade. Figure 5-2 The locations and quantities of one beam and multiple beams are listed separately. Next, using carbon fiber and other composite materials, the upper and lower blades of the propeller are fabricated through processes such as molding, vacuum casting, and hand lay-up. Before the upper and lower blades are molded together... Figure 4-2 The carbon fiber and other composite material ribs 2 are coated with structural adhesive or other bonding materials on both sides. The ribs 2 are then placed in the corresponding positions, and the blades are molded together. After mold closing, the upper and lower surfaces of the blades are simultaneously bonded to the carbon fiber and other composite material beams to form an integral structure. This beam structure molding process is simple, low-cost, and highly efficient, making it suitable for small-batch production and for blades with high strength requirements. Its advantages include good blade acceleration, light weight, simple structure, easy molding, and excellent strength.
[0035] Second, first, fix the unformed fabric on the upper and lower surfaces of the blades, along with the pre-made beam fixtures, to the upper or lower half of the blade. The materials can be carbon fiber, glass fiber, honeycomb, or other composite materials. The thickness of the wooden beam, as well as its arrangement and number within the blade, can be determined based on the blade's length, size, and strength requirements. Figure 5-1 , Figure 5-2At this point, the upper or lower surface of the blade is integrally molded with the beam through vacuum infusion or vacuum introduction. Next, the other half of the blade is made using carbon fiber and other composite materials through processes such as molding, vacuum infusion, and hand lay-up. Before the upper and lower blades are molded together, structural adhesive or other bonding materials are applied to the molded end of the carbon fiber and other composite material rib beam 2. Then, the upper and lower blades are molded together, and after molding, the upper and lower surfaces of the blade are simultaneously bonded to the carbon fiber and other composite material beam to form an integral structure. This beam structure is suitable for small-batch production and for blades with high strength requirements. Its advantages include good blade acceleration, light weight, high structural strength, easy molding, and excellent strength.
[0036] Third, first, place the unformed fabric on both sides of the blade and the pre-formed beam fixture into the mold and assemble them. The material can be carbon fiber, glass fiber, honeycomb, or other composite materials. The thickness of the wooden beam, as well as the arrangement and number of beams within the blade, can be determined according to the length and size of the blade and the required strength. Figure 5-2 If prepreg is used, it can be directly pressurized and heated to cure and form. If fiber cloth is used, vacuum injection or vacuum introduction is required to integrally form the upper and lower surfaces of the blade with the pre-formed beam. After forming, the internal pre-forming tooling is removed. This beam structure is suitable for small-batch production, where high strength and light weight are required, and the highest bending and torsional strength is needed, especially for medium and large blades. Advantages include extremely high structural strength, excellent overall strength, uniform stress distribution on the blade, superior impact resistance, good acceleration, and low torsional resistance. It is the optimal structure for aircraft blades.
[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A carbon fiber propeller, characterized in that: The propeller includes a propeller blade (1), which is divided into upper and lower blades. The propeller blade (1) is connected to the upper and lower blades by one or more ribs (2) in the middle, so that the upper and lower blades are integrated. The upper and lower blades of the propeller blade (1) are made of carbon fiber or carbon fiber and honeycomb composite material. The ribs (2) are made of wood, carbon fiber or composite material. The front part of the propeller blade (1) is provided with a front sill (3) and the rear part of the propeller blade (1) is provided with a rear sill (4). The front sill (3) and the ribs (2) form a D shape, and the rear sill (4) and the ribs (2) form an A shape.
2. A carbon fiber propeller according to claim 1, characterized in that: The wooden rib beam (2) is a flat "1" shaped beam.
3. A carbon fiber propeller according to claim 1, characterized in that: Carbon fiber and composite material ribs (2) are "I" or "I" shaped beams.
4. A carbon fiber propeller according to claim 1, characterized in that: The propeller blade (1) has a hollow structure inside.