CN112429201A - Propeller composite material blade - Google Patents
Propeller composite material blade Download PDFInfo
- Publication number
- CN112429201A CN112429201A CN202011519380.1A CN202011519380A CN112429201A CN 112429201 A CN112429201 A CN 112429201A CN 202011519380 A CN202011519380 A CN 202011519380A CN 112429201 A CN112429201 A CN 112429201A
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- China
- Prior art keywords
- root
- carbon beam
- metal
- cylinder
- truncated cone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
- B64C11/16—Blades
- B64C11/20—Constructional features
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- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Moulding By Coating Moulds (AREA)
- Wind Motors (AREA)
Abstract
The invention discloses a propeller composite material blade.A circular truncated cone I, a circular truncated cone II, a transition cylinder II and a curved surface which is consistent with the bending of a blade body molded surface are sequentially arranged at the small end of a metal blade root from the rear of a tail end cylinder at the large end; the elliptic end head which is matched with the bent shape of the paddle body and protrudes from the center of the big end of the foam core is inserted into the elliptic groove at the center of the small end of the metal paddle root; the starting end of the carbon beam is tightly attached to and wrapped on the circular truncated cone I, the carbon beam is changed into two pieces from the curved surface, and the carbon beam is paved along the rectangular grooves of the working surface and the non-working surface of the foam core; the covering covers wrap the curved surface of the metal paddle root and all parts of the paddle body from the transition cylinder II; the front edge and the rear edge are filled with foam and filled in the gaps between the skin and the metal paddle root; the carbon fiber cloth is filled in all gaps among the skin, the carbon beam and the foam core, and the carbon beam winding belt is wound on the carbon beam part without being wrapped by the skin. The blade of the invention has light weight, reliable structure, excellent pneumatic performance and good fatigue resistance of the blade root.
Description
Technical Field
The invention relates to a propeller composite blade.
Background
The existing propeller composite material blade consists of a metal blade handle and a composite material wrapped outside the metal blade handle, wherein a skin completely wraps a carbon beam and a metal propeller root, no filling foam or filling carbon fiber cloth is arranged inside the skin, the appearance aerodynamic performance of the propeller root is low, the number of upper laying layers of the metal propeller root is large, the manufacturability is poor, defects are easy to generate, and the weight of the propeller blade is heavy. The connection of petiole and foam core is the V type, and the connection of foam core and petiole is weak, is difficult for the location, and the carbon beam is spread the layer unsatisfactory, leads to the paddle after the shaping uniformity poor, and the paddle bearing capacity is poor. The propeller blade requires good aerodynamic performance, good structural reliability and safety, light weight, good design manufacturability, low rejection rate and the like, and the existing composite material blade cannot meet the requirements.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide the propeller composite blade which has the advantages of light weight, reliable structure, excellent pneumatic performance, wide and chord length of the root of the blade, good fatigue resistance of the root of the blade, simple process operation and capability of completely meeting the requirements of a propeller plane on the blade.
In order to achieve the purpose, the technical solution of the invention is as follows: a propeller composite blade comprises a metal blade root and a blade body; the paddle body comprises a foam core, a carbon beam, front and rear edge filling foams, carbon fiber cloth, a carbon beam winding belt and a skin;
the large end of the metal propeller root is in a structure connected with a propeller hoop, and the small end of the metal propeller root is sequentially provided with a circular truncated cone I with a reduced diameter, a cylinder I with the diameter same as the minimum diameter of the circular truncated cone I, a circular truncated cone II with an enlarged diameter, a transition cylinder II with the same large diameter as the circular truncated cone II and a curved surface which is bent and consistent with the profile of the propeller body from the rear of a tail end cylinder of the large end; the tail end cylinder of the big end, the circular truncated cone I, the cylinder I, the circular truncated cone II and the transition cylinder II are connected by a transition cambered surface; an elliptical groove is formed in the center of the end face of the small end;
the foam core is matched with the bent shape of the paddle body, an elliptic end head matched with an elliptic groove at the small end of the metal paddle root protrudes from the center of the large end of the foam core, and rectangular grooves are formed in the centers of the working surface and the non-working surface of the large end of the foam core; the oval end head is inserted in the oval groove;
the starting end of the carbon beam is tightly attached to and wrapped on the circular truncated cone I of the metal propeller root, the carbon beam is changed into two pieces from the curved surface of the metal propeller root, the two pieces are gradually transited to rectangular grooves along the working surface and the non-working surface of the foam core to be paved, the paving length is not less than 70% of the blade body, and the width accounts for 40-70% of the working surface and the non-working surface of the blade body;
the skin wraps the curved surface of the metal paddle root and all parts of the paddle body from the transition cylinder II of the metal paddle root; the front edge and the rear edge are filled with foam and filled in a gap between the skin and the metal paddle root; the carbon fiber cloth is filled in all gaps among the skin, the carbon beam and the foam core, the carbon beam winding belt is wound on the carbon beam part without being wrapped by the skin, and resin is filled in gaps of the carbon beam winding belt.
Further preferably, the diameter of each transition cambered surface of the metal paddle root is not less than 20mm, and the length of the transition cylinder II is not less than 5 mm. The root position composite material is ensured to have small stress and smooth rigidity change.
Further preferably, the length of the cylinder I of the metal paddle root is not less than 12 mm. The reliability of the propeller root is ensured.
Further preferably, the taper angle of the circular truncated cone I of the metal paddle root is not less than 40 degrees. And the stress concentration of the metal paddle root is ensured to be small.
Further preferably, the length of the oval end of the large end of the foam core is not less than 10 mm. The positioning and the installation of the foam core are ensured to be reliable.
Further preferably, the diameter of the cylinder I is at least 5mm smaller than the diameter of the transition cylinder II. So as to prevent the carbon beam from separating from the metal paddle root, and the fixing reliability is high.
Further preferably, the carbon beam wrapping tape is a high modulus glass tape with a width not less than 45 mm. The fixing reliability of the carbon beam at the root of the blade is ensured.
Further preferably, the front edge filling foam and the rear edge filling foam are high-performance foams with the compression strength value not less than 4 MPa. So as to ensure that the load of the skin is well transferred to the carbon beam and the metal paddle root and avoid the damage of the skin.
The metal paddle root has a transition arc surface, the slope of the circular table surface changes smoothly, large stress concentration is avoided during bearing, the root of the carbon beam is laid on the metal paddle root and is wound by the carbon beam winding belt, and the high strength and the high reliability of the root of the paddle blade are ensured; the foam is filled between the skin and the metal paddle root, so that the wide chord length and the good pneumatic performance of the paddle root are ensured, and the carbon fiber cloth is filled in all gaps among the skin, the carbon beam and the foam core and among the skin, the carbon beam and the foam core, so that the smooth transmission of the load of the skin at the paddle root to the carbon beam is ensured. In a word, the propeller blade has the advantages of good performance, light weight, high strength, good reliability and safety, particularly good bearing effect of the root part of the blade, simple process and manufacture, and difficult dense gaps, layering and other defects of the blade, and completely meets various requirements of the propeller plane on the blade.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a cross-sectional view AA in FIG. 1;
FIG. 3 is an enlarged view of a section BB of FIG. 1;
FIG. 4 is an enlarged sectional view of DD from FIG. 1;
FIG. 5 is an enlarged cross-sectional view of EE of FIG. 1;
FIG. 6 is a front view of a metal blade root according to the present invention;
FIG. 7 is a cross-sectional view CC of FIG. 6;
FIG. 8 is a front view of a foam core of the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
As shown in fig. 1 to 8, the present embodiment includes a metal blade root 1 and a blade body. The oar body comprises a foam core 5, a carbon beam 2, front and rear edge filling foams 7 and 6, a carbon fiber cloth 4, a carbon beam winding belt 8 and a skin 3. The large end of the metal propeller root 1 is in a structure connected with a propeller hoop, and the embodiment has 5 cylindrical sections; the small end is sequentially provided with a circular truncated cone I16 with a reduced diameter, a cylinder I11 with the diameter same as the minimum diameter of the circular truncated cone I16, a circular truncated cone II 13 with an enlarged diameter, a transition cylinder II 14 with the same large diameter as the circular truncated cone II 13 and a curved surface 17 which is bent and consistent with the profile of the paddle body from the rear of the tail end cylinder of the large end. The tail end cylinder of the big end, the round table I16, the cylinder I11, the round table II 13 and the transition cylinder II 14 are connected by a transition cambered surface 18; preferably, the diameter of each transition cambered surface 18 of the metal paddle root 1 is not less than 20mm, and the length of the transition cylinder II 14 is not less than 5 mm. The center of the end face of the small end is provided with an oval groove 19. The foam core 5 is matched with the bent shape of the paddle body, an elliptic end head 15 matched with an elliptic groove 19 at the small end of the metal paddle root 1 protrudes from the center of the large end of the foam core, and a rectangular groove 12 is formed in the centers of the working surface and the non-working surface of the large end of the foam core; the oval end head 15 is inserted in the oval groove 12. The starting end of the carbon beam 2 is tightly attached to and wrapped on a circular truncated cone I16 of the metal paddle root 1, the carbon beam is changed into two pieces from a curved surface 17 of the metal paddle root and gradually transited to a rectangular groove 12 which is paved along a working surface and a non-working surface of the foam core 5, the paving length is not less than 70% of the blade body, the width accounts for any value of 40-70% of the working surface and the non-working surface of the blade body, and the preferable range is any value of 50-60%. Preferably, the length of the cylinder I11 of the metal paddle root is not less than 12 mm. Preferably, the taper angle of the circular truncated cone I16 of the metal paddle root is not less than 40 degrees. Preferably, the length of the oval end 15 of the large end of the foam core 5 is not less than 10 mm. The skin 3 wraps the curved surface 17 of the metal paddle root and all parts of the paddle body from the transition cylinder II 14 of the metal paddle root 1. The front and rear edge filling foams 7 and 6 are filled in the front and rear edge gaps between the skin 3 and the metal paddle root 1. Preferably, the front and rear edge filling foams 7 and 6 are high performance foams having a compression strength value of not less than 4 MPa. The carbon fiber cloth 4 is filled in all gaps among the skin 3, the carbon beam 2 and the foam core 5. The carbon beam winding belt 8 is wound on the carbon beam 2 without being wrapped by the skin, and resin is filled in gaps of the carbon beam winding belt 8. Preferably, the carbon beam wrapping tape 8 is a high modulus glass tape with a width of no less than 45 mm.
There are, of course, many other embodiments of the invention and modifications and variations of this invention that will be obvious to those skilled in the art may be made without departing from the spirit and scope of the invention, but it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention.
Claims (10)
1. A propeller composite blade characterized in that: comprises a metal paddle root and a paddle body; the paddle body comprises a foam core, a carbon beam, front and rear edge filling foams, carbon fiber cloth, a carbon beam winding belt and a skin;
the large end of the metal propeller root is in a structure connected with a propeller hoop, and the small end of the metal propeller root is sequentially provided with a circular truncated cone I with a reduced diameter, a cylinder I with the diameter same as the minimum diameter of the circular truncated cone I, a circular truncated cone II with an enlarged diameter, a transition cylinder II with the same large diameter as the circular truncated cone II and a curved surface which is bent and consistent with the profile of the propeller body from the rear of a tail end cylinder of the large end; the tail end cylinder of the big end, the circular truncated cone I, the cylinder I, the circular truncated cone II and the transition cylinder II are connected by a transition cambered surface; an elliptical groove is formed in the center of the end face of the small end;
the foam core is matched with the bent shape of the paddle body, an elliptic end head matched with an elliptic groove at the small end of the metal paddle root protrudes from the center of the large end of the foam core, and rectangular grooves are formed in the centers of the working surface and the non-working surface of the large end of the foam core; the oval end head is inserted in the oval groove;
the starting end of the carbon beam is tightly attached to and wrapped on the circular truncated cone I of the metal propeller root, the carbon beam is changed into two pieces from the curved surface of the metal propeller root, the two pieces are gradually transited to rectangular grooves along the working surface and the non-working surface of the foam core to be paved, the paving length is not less than 70% of the blade body, and the width accounts for 40-70% of the working surface and the non-working surface of the blade body;
the skin wraps the curved surface of the metal paddle root and all parts of the paddle body from the transition cylinder II of the metal paddle root; the front edge and the rear edge are filled with foam and filled in a gap between the skin and the metal paddle root; the carbon fiber cloth is filled in all gaps among the skin, the carbon beam and the foam core, the carbon beam winding belt is wound on the carbon beam part without being wrapped by the skin, and resin is filled in gaps of the carbon beam winding belt.
2. The proprotor composite blade according to claim 1, wherein: the diameter of each transition cambered surface of the metal paddle root is not less than 20mm, and the length of the transition cylinder II is not less than 5 mm.
3. The proprotor composite blade according to claim 1 or 2, wherein: the length of the cylinder I of the metal paddle root is not less than 12 mm.
4. The proprotor composite blade according to claim 3, wherein: the taper angle of the circular truncated cone I of the metal paddle root is not less than 40 degrees.
5. The proprotor composite blade according to claim 4, wherein: the length of the oval end head of the large end of the foam core is not less than 10 mm.
6. The proprotor composite blade according to claim 5, wherein: the diameter of the cylinder I is at least 5mm smaller than that of the transition cylinder II.
7. The proprotor composite blade according to claim 6, wherein: the carbon beam winding belt is a high-modulus glass belt, and the width of the carbon beam winding belt is not less than 45 mm.
8. The proprotor composite blade according to claim 7, wherein: the front edge filling foam and the rear edge filling foam are high-performance foams with the compressive strength value not less than 4 MPa.
9. The proprotor composite blade according to claim 1 or 2, wherein: the taper angle of the circular truncated cone I of the metal paddle root is not less than 40 degrees.
10. The proprotor composite blade according to claim 1 or 2, wherein: the length of the oval end head of the large end of the foam core is not less than 10 mm; the diameter of the cylinder I is at least 5mm smaller than that of the transition cylinder II; the carbon beam winding belt is a high-modulus glass belt, and the width of the carbon beam winding belt is not less than 45 mm; the front edge filling foam and the rear edge filling foam are high-performance foams with the compressive strength value not less than 4 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011519380.1A CN112429201A (en) | 2020-12-21 | 2020-12-21 | Propeller composite material blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011519380.1A CN112429201A (en) | 2020-12-21 | 2020-12-21 | Propeller composite material blade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112429201A true CN112429201A (en) | 2021-03-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011519380.1A Pending CN112429201A (en) | 2020-12-21 | 2020-12-21 | Propeller composite material blade |
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| Country | Link |
|---|---|
| CN (1) | CN112429201A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114193793A (en) * | 2021-12-13 | 2022-03-18 | 惠阳航空螺旋桨有限责任公司 | Blade for axial-flow compressor |
-
2020
- 2020-12-21 CN CN202011519380.1A patent/CN112429201A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114193793A (en) * | 2021-12-13 | 2022-03-18 | 惠阳航空螺旋桨有限责任公司 | Blade for axial-flow compressor |
| CN114193793B (en) * | 2021-12-13 | 2024-04-26 | 惠阳航空螺旋桨有限责任公司 | Blade for axial-flow compressor |
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