A composite propeller blade root connection structure

Abstract

The present invention relates to a composite propeller blade root connection structure, including a hub lower plate, a hub upper plate, a nut, a washer, a propeller sleeve, a petiole, a carbon fiber composite material and a skin; a slit parallel to the axial direction is opened from the front end of the propeller sleeve, and the slits are two; the nut is threadedly matched with the other end of the petiole, and the rotating nut pushes the propeller sleeve to move axially, and the skin and the carbon fiber composite material are pressed against the inverted cone surface of one end of the petiole through the inner cone surface; the hub lower plate and the hub upper plate tighten the propeller sleeve, so that the propeller sleeve is deformed to tighten and fix the skin, the carbon fiber composite material and the petiole at the neck. The propeller composite blade root connection structure of the present invention is particularly suitable for small propellers, meets the design requirements of the strength and stiffness of the propeller, and achieves the purpose of convenient installation and disassembly of the blade, accurate installation positioning, and simple adjustment of the installation angle.

Description

Technical Field

[0001] The invention relates to the field of propeller composite blades, and in particular to a composite propeller blade root connection structure. Background Art

[0002] At present, my country produces a large number of small propeller composite blade products with different uses, structures and sizes, so the root connection structures of the blades are also different. However, no matter what kind of blade it is, the centrifugal force, bending moment, torque and other loads all reach their maximum value at the root end. The design of the blade root connection structure is to transfer the load borne by the entire blade to the propeller shell, so the root connection structure is particularly important.

[0003] The propeller model has a blade length of 410mm and needs to meet the test requirements at a maximum speed of 7000rpm and multiple angles. Since the blade root size is relatively small and the structural space is limited, it is difficult to design the blade root connection structure. By consulting relevant information and application examples, the previous connection form is not suitable for this model machine, so a blade root connection structure is designed. This blade root connection structure is safe, reliable, and easy to operate. Summary of the invention

[0004] Purpose of the invention: To provide a solution to the blade-root connection problem of a propeller with a long blade length, a high rotation speed and a limited structural space, so that the blade-root connection structure is safe, reliable and easy to operate.

[0005] Technical solution: c, comprising a hub lower plate 1, a hub upper plate 2, a nut 3, a washer 4, a propeller sleeve 5, a blade stalk 7, a carbon fiber composite material 8 and a skin 9;

[0006] The outer wall surface of one end of the petiole forms an inverted cone surface, and the outer wall surface of the other end is an external thread; the middle part of the petiole is a neck;

[0007] The carbon fiber composite material 8 is wrapped around the outer wall surface of one end of the petiole, and the skin 9 is wrapped outside the carbon fiber composite material; the carbon fiber composite material forms a blade carbon beam;

[0008] The propeller cover is sleeved outside the skin 9, and the inner wall surface of the front end of the propeller cover forms an inner cone surface;

[0009] A slit parallel to the axial direction is opened from the rear end of the paddle sleeve, and the number of the slits is at least two;

[0010] The nut is threadedly matched with the other end of the petiole 7, and the rotation of the nut drives the propeller sleeve to move axially, and the skin and the carbon fiber composite material are pressed against the inverted cone surface at one end of the petiole through the inner cone surface;

[0011] The hub lower plate 1 and the hub upper plate 2 clamp the propeller sleeve, so that the propeller sleeve is deformed to tighten and fix the skin, carbon fiber composite material and petiole 7 at the neck.

[0012] Furthermore, it also includes a gasket 4, which is arranged between the nut and the propeller sleeve. In particular, the gasket is a rubber gasket.

[0013] Furthermore, a foam core 6 is filled between the carbon fiber composite material 8 and the skin 9 .

[0014] Furthermore, the propeller sleeve forms an end flange, and the flange forms a limiting fit with the hub lower plate 1 and the hub upper plate 2 respectively.

[0015] Furthermore, there are two slits, and the two slits are at the same horizontal position. Furthermore, the width of the slit is 1 mm to 5 mm. When the upper hub plate and the lower hub plate are clamped, the pressure on the propeller root is increased, so that the propeller blade can withstand greater centrifugal force during operation.

[0016] Furthermore, the length of the slit is at least 2 / 3 of the length of the paddle sleeve.

[0017] Furthermore, the slit is opened from the rear end of the propeller sleeve to the starting position of the inner cone surface of the front end of the propeller sleeve.

[0018] Furthermore, the wheel hub lower plate 1 and the wheel hub upper plate 2 surround the nut.

[0019] Technical effect: The propeller composite blade root connection structure of the present invention is particularly suitable for small propellers, meets the design requirements of the strength and rigidity of the propeller, and achieves the purposes of convenient installation and disassembly of the blades, accurate installation positioning, and easy adjustment of the installation angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 is a schematic diagram of a paddle cover;

[0022] Among them: 1-hub lower plate, 2-hub upper plate, 3-nut, 4-gasket, 5-propeller sleeve, 6-foam core, 7-stalk, 8-carbon fiber composite material, 9-skin, 10-seam. DETAILED DESCRIPTION

[0023] In conjunction with the accompanying drawings, a composite propeller blade root connection structure is specifically provided, including a hub lower plate 1, a hub upper plate 2, a nut 3, a washer 4, a propeller sleeve 5, a blade stalk 7, a carbon fiber composite material 8 and a skin 9;

[0024] The outer wall surface of one end of the petiole forms an inverted cone surface, and the outer wall surface of the other end is an external thread; the middle part of the petiole is a neck;

[0025] The carbon fiber composite material 8 is wrapped around the outer wall surface of one end of the petiole, and the skin 9 is wrapped outside the carbon fiber composite material; the carbon fiber composite material forms a blade carbon beam;

[0026] The propeller cover is sleeved outside the skin 9, and the inner wall surface of the front end of the propeller cover forms an inner cone surface;

[0027] A slit 10 parallel to the axial direction is opened from the front end of the paddle sleeve, and there are at least two slits;

[0028] The nut is threadedly matched with the other end of the petiole 7, and the rotation of the nut drives the propeller sleeve to move axially, and the skin and the carbon fiber composite material are pressed against the inverted cone surface at one end of the petiole through the inner cone surface;

[0029] The hub lower plate 1 and the hub upper plate 2 clamp the propeller sleeve, so that the propeller sleeve is deformed to tighten and fix the skin, carbon fiber composite material and petiole 7 at the neck.

[0030] Furthermore, it also includes a gasket 4, which is arranged between the nut and the propeller sleeve. In particular, the gasket is a rubber gasket.

[0031] Furthermore, a foam core 6 is filled between the carbon fiber composite material 8 and the skin 9 .

[0032] Furthermore, the propeller sleeve forms an end flange, and the flange forms a limiting fit with the hub lower plate 1 and the hub upper plate 2 respectively.

[0033] Furthermore, there are two slits, and the two slits are at the same horizontal position.

[0034] Furthermore, the length of the slit is 2 / 3 of the length of the paddle sleeve.

[0035] Furthermore, the wheel hub lower plate 1 and the wheel hub upper plate 2 surround the nut.

Claims

1. A composite propeller blade root connection structure, characterized in that: It includes a hub lower plate, a hub upper plate, nuts, washers, propeller sleeves, blade stalks, carbon fiber composite materials and skins; The outer wall surface of one end of the petiole forms an inverted cone surface, and the outer wall surface of the other end is an external thread; the middle part of the petiole is a neck; The carbon fiber composite material is wrapped around the outer wall surface of one end of the petiole, and the skin is wrapped outside the carbon fiber composite material; the carbon fiber composite material forms a blade carbon beam; The propeller cover is sleeved outside the skin, and the inner wall surface of the front end of the propeller cover forms an inner cone surface; A slit parallel to the axial direction is opened from the front end of the paddle sleeve, and the number of the slits is at least two; The nut is threadedly matched with the other end of the petiole, and the rotation of the nut drives the propeller sleeve to move axially, and the skin and the carbon fiber composite material are pressed against the inverted conical surface at one end of the petiole through the inner conical surface; The hub lower plate and the hub upper plate clamp the propeller sleeve, so that the propeller sleeve is deformed and clamps and fixes the skin, carbon fiber composite material and the blade stalk at the neck.

2. A composite propeller blade root connection structure according to claim 1, characterized in that: Also included is a gasket, which is arranged between the nut and the propeller sleeve.

3. A composite propeller blade root connection structure according to claim 2, characterized in that: The gasket is a rubber gasket.

4. A composite propeller blade root connection structure according to claim 1 or 2, characterized in that: A foam core is filled between the carbon fiber composite material and the skin.

5. A composite propeller blade root connection structure according to claim 1 or 2, characterized in that: The propeller sleeve forms an end flange, and the flange is respectively limitedly matched with the lower plate of the hub and the upper plate of the hub.

6. A composite propeller blade root connection structure according to claim 1 or 2, characterized in that: There are two slits, and the two slits are at the same horizontal position.

7. A composite propeller blade root connection structure according to claim 1 or 2, characterized in that: The length of the slit is 2 / 3 of the length of the paddle sleeve.

8. A composite propeller blade root connection structure according to claim 1 or 2, characterized in that: The wheel hub lower plate and the wheel hub upper plate surround the nut.

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