CN103253367A - Composite material air propeller and preparation die and preparation method thereof - Google Patents

Abstract

The invention relates to a composite material air propeller and its preparation mold and preparation method, wherein the composite material air propeller includes an upper wall plate and a lower wall plate, and the upper and lower surfaces of the upper wall plate are respectively the upper wall plate The outer surface and the inner surface of the upper wall, the upper and lower surfaces of the lower wall are respectively the inner surface of the lower wall and the outer surface of the lower wall, the inner surface of the upper wall and the inner surface of the lower wall The shape surfaces are fixedly connected by peripheral bonding to form a whole composite air propeller, and a cavity is formed inside the composite air propeller. In the present invention, the composite air propeller is designed as a split structure, and the interior is hollow, so that the structure of the present invention is simple, easy to manufacture, low in cost, light in weight, and the structural characteristics of the tip of the propeller being bent upward to form a warp make the present invention The induced drag is greatly reduced, which is very beneficial to the application and development of multi-rotor aircraft.

Description

A kind of composite material air propeller and its preparation mold and preparation method

technical field

The invention relates to a composite material air propeller and its preparation mold and preparation method, more specifically relates to a multi-rotor aircraft propeller and its preparation mold and preparation method, and belongs to the technical field of flying devices.

Background technique

At present, multi-rotor aircraft (aircraft model or UAV) mainly use solid plastic propellers or solid carbon fiber composite propellers. The diameter of such propellers is small, and such propellers with large sizes are heavy and heavy, so they are not suitable for multi-rotor aircraft. . Traditional larger-diameter composite material propellers generally have a complex structure, usually consisting of skins, girders, filled foam (or honeycomb), counterweight supports, and counterweights, which are difficult to manufacture and costly, and weigh more than solid propellers Light, but the weight is still not suitable for multi-rotor aircraft. Usually, when a given pulling force is obtained, it can be obtained by rotating a small-diameter propeller at a high speed or by a large-diameter propeller rotating at a low speed, but a large-diameter propeller will be more efficient and less noisy, which is more conducive to the application of multi-rotor aircraft. the

Usually, when the aircraft is flying at high speed, the wing tips generate wingtip vortices, which consume the energy of the aircraft. Winglets have the function of reducing the induced drag of the aircraft by reducing the strength of the wingtip vortex, thereby improving the flight efficiency of the aircraft. The propeller is like a rotating wing, and the speed is the highest at the tip of the propeller. Ordinary propellers do not have a tip structure that functions like a winglet, and the induced resistance is relatively large.

Contents of the invention

In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide a composite air propeller with simple structure, light weight and convenient manufacture, as well as its preparation mold and preparation method.

To achieve the above object, the present invention is achieved through the following technical solutions:

A composite material air propeller, characterized in that it comprises an upper wall plate and a lower wall plate, the upper and lower surfaces of the upper wall plate are respectively the outer surface of the upper wall plate and the inner surface of the upper wall plate, and the lower The upper and lower surfaces of the wall panels are respectively the inner surface of the lower wall panel and the outer surface of the lower wall panel. The inner surface of the upper wall panel and the inner surface of the lower wall panel are fixedly connected by peripheral bonding to form a composite air propeller. , and a cavity is formed inside the composite air propeller as a whole.

The whole middle of the composite air propeller is the blade root, and the two ends are the blade tip, and the blade tip is bent upward to form a warp.

The material of the upper wall plate and the lower wall plate is carbon fiber composite material or boron fiber composite material.

A preparation mold for a composite air propeller, characterized in that it comprises an upper wall panel profile surface mold, an upper wall panel inner profile surface mold, a lower wall panel profile surface mold and a lower wall panel inner profile surface mold, the upper wall panel The outer surface mold of the panel and the inner surface mold of the upper wall panel are butted and matched with each other to form the cavity of the upper wall panel, and the outer surface mold of the lower wall panel and the inner surface mold of the lower wall panel are butted and matched with each other to form the lower wall panel internally At the same time, the mold for the outer surface of the upper wall plate and the mold for the outer surface of the lower wall plate are butted and matched to form the overall cavity of the air propeller made of composite material.

A kind of preparation method of composite air propeller, is characterized in that, comprises the following steps:

(1) Molding the upper wall and lower wall: connect the outer surface mold of the upper wall with the inner surface mold of the upper wall, then mold the upper wall, and then mold the outer surface of the lower wall with the inner shape of the lower wall. After the surface mold is docked and matched, the lower wall panel is molded;

(2) Bonding to form a composite air propeller: place the upper wall panel in the mold of the outer surface of the upper wall panel, place the lower wall panel in the mold of the outer surface of the lower wall panel, and then place the mold of the outer surface of the upper wall panel and the lower wall panel The shape surface molds are butted and matched, and then the upper wall plate and the lower wall plate are glued and fixed with an adhesive to form a composite air propeller as a whole.

Furthermore, a method for preparing a composite air propeller further includes a step of injecting an adhesive into a cavity formed inside the composite air propeller or painting resin (or paint) on the surface of the propeller. To adjust the dynamic balance of the composite air propeller, the amount of filling or brushing is determined according to the dynamic balance test.

The beneficial effects of the present invention are: the present invention designs the composite material air propeller as a split structure, and the interior is hollow, so that the present invention has a simple structure, easy manufacture, low cost, light weight, and the tip of the propeller is bent upward to form a warp The structural features of the invention greatly reduce the induced resistance, which is very beneficial to the application and development of multi-rotor aircraft.

Description of drawings

Fig. 1 is the overall schematic diagram of composite air propeller of the present invention;

Fig. 2 is the schematic diagram of the local structure after the enlargement of part A of Fig. 1;

Fig. 3 is the B-B direction sectional view of Fig. 1;

Fig. 4 is the split structure schematic diagram of composite material air propeller of the present invention;

Fig. 5 is the structural representation of the preparation mold of composite air propeller of the present invention;

Fig. 6 is the split structure schematic diagram of the preparation mold of composite air propeller of the present invention;

Fig. 7 is a schematic diagram of the structure of the cooperation between the shape mold of the upper wall panel and the shape mold of the lower wall panel according to the present invention.

The meanings of the main reference signs in the figure are:

1. Upper panel 2. Lower panel 3. Upper panel shape mold 4. Upper panel inner surface mold

5. The outer surface mold of the lower wall panel 6. The positioning pin 7. The inner surface mold of the lower wall panel.

Detailed ways

The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is the overall schematic diagram of the composite material air propeller of the present invention; Fig. 2 is the enlarged local structure schematic diagram of the A part of Fig. 1; Fig. 3 is the B-B direction sectional view of Fig. 1; Fig. 4 is the composite of the present invention Schematic diagram of split structure of material air propeller.

As shown in Figures 1-4: composite material air propellers include an upper wall plate 1 and a lower wall plate 2. In this embodiment, the materials of the upper wall plate and the lower wall plate are carbon fiber composite materials, and of course It can be a boron fiber composite material. The upper and lower surfaces of the upper wall plate 1 are respectively the outer surface of the upper wall plate and the inner surface of the upper wall plate, and the upper and lower surfaces of the lower wall plate 2 are the inner surface of the lower wall plate and the lower wall respectively. The outer surface of the plate, the inner surface of the upper wall plate and the inner surface of the lower wall plate are fixedly connected by peripheral bonding to form a composite air propeller as a whole.

The middle of the composite air propeller is the blade root, and the two ends are the blade tip, and the blade tip is bent upward to form a warp, which is like a winglet with the wing tip bent upward to reduce the induced resistance. In actual use, the dynamic balance, filling amount or brushing amount is adjusted by injecting adhesive into the cavity formed inside the composite air propeller, or by painting resin (or paint) on the surface of the propeller Can be determined by dynamic balance test.

Fig. 5 is the structural representation of the preparation mold of composite air propeller of the present invention; Fig. 6 is the split structure schematic diagram of the preparation mold of composite material air propeller of the present invention; Fig. 7 is the upper wall of the present invention Schematic diagram of the cooperation between the panel shape mold and the lower wall panel shape mold

As shown in Fig. 5-Fig. 7: a kind of mold for the preparation of composite material air propeller, comprises upper wall board outer shape mold 3, upper wall board inner shape mold 4, lower wall board outer shape mold 5 and lower wall board inner shape Surface mold 7, the upper wall panel outer surface mold 3 and the upper wall panel inner surface mold 4 are docked and matched with each other to form an upper wall panel cavity, and the lower wall panel outer surface mold 5 and the inner surface of the lower wall panel After the shape surface molds 7 are butted and matched with each other, the lower wall plate cavity is formed inside, and at the same time, the upper wall plate shape surface mold 3 and the lower wall plate shape surface mold 5 are butted and matched to form the overall cavity of the composite air propeller. Specifically, the above-mentioned upper wall panel profile surface mold 3 and the lower wall panel profile surface mold 5 are docked and matched through positioning holes and positioning pins 6 respectively arranged on the upper wall panel profile surface mold 3 and the lower wall panel profile surface mold 5 For positioning, each part of the preparation mold of the composite air propeller can be accurately combined through positioning design. The design method of the mold according to the present invention can ensure the consistency of the upper wall plate 1 and the lower wall plate 2, and can simultaneously Ensure the accuracy of composite air propeller shape, suitable for mass production.

And the preparation method of composite material air propeller, then specifically comprises the following steps:

(1) Molding the upper wall panel 1 and the lower wall panel 2: connect the upper wall panel outer surface mold 3 with the upper wall panel inner surface mold 4, then mold the upper wall panel 1, and mold the lower wall panel outer surface mold 5 Molding the lower wall plate 2 after docking with the inner surface mold 7 of the lower wall plate;

(2) Bonding to form a composite air propeller: place the upper wall panel 1 in the outer surface mold 3 of the upper wall panel, place the lower wall panel 2 in the outer mold 5 of the lower wall panel, and then place the upper wall panel outer surface mold 3 and the mold 5 on the outer surface of the lower wall panel are docked and matched through the positioning hole and the positioning pin 6, and then the upper wall panel 1 and the lower wall panel 2 are bonded and fixed with an adhesive to form a composite air propeller as a whole.

Finally, after the dynamic balance test, the dynamic balance is adjusted by injecting adhesive into the inner cavity of the composite air propeller or painting resin (or paint) on the surface.

The invention can not only solve the problems of heavy weight of solid propellers, large noise of small-diameter paddles, large pulling force and high rotational speed, but also solve the problems of complex structure, difficult manufacture and high cost of traditional composite propellers, and at the same time reduce the induced resistance of propellers , which is beneficial to the application and development of multi-rotor aircraft.

The present invention has been described according to the above-mentioned embodiments. It should be understood that the above-mentioned embodiments do not limit the present invention in any form, and all technical solutions obtained by adopting equivalent replacement or equivalent transformation methods fall within the protection scope of the present invention.

Claims (6)

1. A composite air propeller, characterized in that it comprises an upper wall plate and a lower wall plate, the upper and lower surfaces of the upper wall plate are respectively the upper wall plate profile surface and the upper wall plate internal profile surface, and the The upper and lower surfaces of the lower wall plate are respectively the inner profile surface of the lower wall plate and the outer profile surface of the lower wall plate, and the inner profile surface of the upper wall plate and the inner profile surface of the lower wall plate are fixedly connected by peripheral bonding to form a composite material air The propeller is integral, and the interior of the composite air propeller integral forms a cavity. 2. A kind of composite material air propeller according to claim 1, characterized in that, the overall tip of the propeller described in [N1] is bent upwards to form a warp. 3. A composite material air propeller according to claim 1, characterized in that, the material of the upper wall plate and the lower wall plate is carbon fiber composite material or boron fiber composite material. 4. a kind of preparation mold of composite air propeller, it is characterized in that, comprise upper wall panel profile surface mold, upper wall panel inner profile surface mold, lower wall panel profile surface mold and lower wall panel inner profile surface mold, described The mold for the outer surface of the upper wall panel and the mold for the inner surface of the upper wall panel are butted and matched with each other to form the cavity of the upper wall panel. At the same time, the outer mold of the upper wall panel and the outer mold of the lower wall panel are butted and matched to form the overall mold cavity of the composite air propeller. 5. A preparation method of a composite air propeller, characterized in that, comprising the following steps: (1) Molding the upper wall and lower wall: connect the outer surface mold of the upper wall with the inner surface mold of the upper wall, then mold the upper wall, and then mold the outer surface of the lower wall with the inner shape of the lower wall. After the surface mold is docked and matched, the lower wall panel is molded; (2) Bonding to form a composite air propeller: place the upper wall panel in the mold of the outer surface of the upper wall panel, place the lower wall panel in the mold of the outer surface of the lower wall panel, and then place the mold of the outer surface of the upper wall panel and the lower wall panel The shape surface molds are butted and matched, and then the upper wall plate and the lower wall plate are glued and fixed with an adhesive to form a composite air propeller as a whole. 6. The method for preparing a composite air propeller according to claim 5, further comprising adjusting the dynamic balance by injecting a filling adhesive into the cavity of the composite air propeller or painting resin or paint on the surface A step of.

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