Light wear-resistant paddle electric anti-icing device

Abstract

The invention belongs to the technical field of propeller anti-icing and de-icing, and relates to a light wear-resistant blade electric anti-icing device for the surface of a propeller. The surface of the paddle needs to have wear resistance, and the product weight needs to be controlled by designing a device on the paddle. The device provided by the invention keeps consistent with the aerodynamic shape of the paddle, and comprises an insulating heat transfer layer, a heating layer and an insulating heat-insulating layer from outside to inside, and the insulating heat transfer layer comprises a rubber sheet, a rubberized fabric and a rubber sheet which are overlapped; the heating layer comprises a rubber sheet, a heating element and a rubber sheet which are overlapped, and all layers of materials of the heating layer are flatly laid and put into a flat plate mold to be preformed to obtain a flat plate rubber pad; and sequentially laying an insulating thermal insulation layer, a flat rubber pad and an insulating heat transfer layer on the male die, and then performing and curing to obtain the light wear-resistant paddle electric anti-icing device. Damage cannot easily occur; and the structure is compact and integrally formed. The service life of the electric anti-icing device is prolonged, the weight of the paddles is reduced, and the reliability of the electric anti-icing device is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of propeller anti-icing and de-icing, and relates to a light-weight wear-resistant blade electric anti-icing device for the surface of a propeller. Background Art

[0002] When an aircraft is flying in icing weather conditions, there is a risk of ice forming on the leading edge of the propeller blades. The electric anti-icing device is energized and heated to provide an anti-icing function for the iced area on the leading edge of the propeller blades, thereby preventing the safe use of the aircraft from being affected by the ice forming on the propeller blades.

[0003] When the blade is working, the surface rubs against the surrounding environment at high speed, so the blade surface needs to be wear-resistant; there is a certain need to reduce the weight of the propeller, so the design of the device on the blade needs to control the weight of the product. The production process of pre-embedded resistance wire integrated with the blade requires high technical difficulty. Once the blade or resistance wire fails during the molding process of the pre-embedded resistance wire blade, the entire blade will be scrapped, so the failure rate is relatively high. Summary of the invention

[0004] The present invention provides a light-weight, wear-resistant blade electric anti-icing device, which solves the problems of high production failure rate of electric anti-icing blades, surface deicing of blades in high-altitude and cold environments, and the need for wear resistance and weight reduction.

[0005] The present invention provides a light-weight, wear-resistant blade electric anti-icing device, which is consistent with the aerodynamic shape of the blade, and comprises an insulating heat transfer layer, a heating layer and an insulating heat insulation layer from the outside to the inside, wherein the insulating heat transfer layer comprises stacked rubber sheets, rubber-coated cloth and rubber sheets; the heating layer comprises stacked rubber sheets, heating elements and rubber sheets, and the various layers of materials of the heating layer are laid flat in a flat mold for pre-forming to obtain a flat rubber pad; the insulating heat insulation layer, the flat rubber pad and the insulating heat transfer layer are laid on the punch in sequence, pre-formed and cured to obtain the light-weight, wear-resistant blade electric anti-icing device.

[0006] Advantageously, the material of the rubber sheet is modified nitrile rubber.

[0007] Advantageously, the device has a cross-sectional thickness of 2.9 mm and a maximum thickness of about 4 mm in the wiring area.

[0008] Advantageously, the thickness of the insulating heat-conducting layer is 1.9 mm.

[0009] Advantageously, the heating layer has a thickness of 0.1 mm.

[0010] Advantageously, preforming requires positioning of the heating element by auxiliary fixtures and multiple pre-pressing to remove residual air between the layers.

[0011] Advantageously, the device is bonded by adhesive in a groove in the leading edge of the propeller blade.

[0012] Advantageously, the curing method is vulcanization molding.

[0013] Beneficial effects: The invention adopts light and wear-resistant materials, which are not easily damaged; the structure is compact and integrally formed, which increases the service life of the electric anti-icing device, reduces the weight of the blades, and improves the reliability of the electric anti-icing device.

[0014] The features, functions, and advantages that have been discussed can be achieved independently in various examples or may be combined in yet other examples. Further details of the examples can be seen with reference to the following description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Examples, as well as preferred modes of use, other objects and description thereof, will be best understood by reference to the following detailed description of examples of the invention when read in conjunction with the accompanying drawings, in which:

[0016] Figure 1 It is a schematic structural diagram of a lightweight wear-resistant blade electric anti-icing device of the present invention;

[0017] Figure 2 Schematic diagram of the molding method. DETAILED DESCRIPTION

[0018] The disclosed examples will be more fully described with reference to the accompanying drawings, in which some (but not all) of the disclosed examples are shown. In fact, many different examples may be described and these examples should not be construed as limited to the examples set forth herein. Instead, these examples are described so that this disclosure will be thorough and complete and will fully convey the scope of the disclosure to those skilled in the art.

[0019] like Figure 1 In the embodiment shown, from top to bottom (from outside to inside), there are an insulating heat transfer layer, a heating layer, an insulating heat insulation layer, an adhesive, and a blade skin. The electric anti-icing device is mainly composed of an insulating heat transfer layer, a heating layer, and an insulating heat insulation layer. The electric anti-icing device is bonded to the groove at the leading edge of the propeller blade by an adhesive.

[0020] The shape of the electric anti-icing device is consistent with the aerodynamic shape of the blade, and the inner surface is consistent with the lower limit of the blade body. The typical cross-sectional thickness is 2.9mm, and the maximum thickness of the wiring area is about 4mm.

[0021] The insulating heat transfer layer consists of a middle layer of rubberized cloth and upper and lower layers of rubber sheets. The rubberized cloth is used to isolate the heating layer from the outside environment and improve the insulation performance between the two; the rubber sheet is used to bond the rubberized cloth and the heating layer and to play an insulating role. The thickness of the insulating heat transfer layer is 1.9mm. The thickness of the heating layer is 0.1mm.

[0022] The insulating layer acts as an insulator between the heating layer and the blade skin, and prevents the heat generated by the heating layer from being transferred to the blade skin. The thickness of the insulating layer is 0.9 mm.

[0023] like Figure 2 As shown, the rubber sheet and rubber-coated cloth can be used after passing the performance test. After the heating element is deburred and cleaned multiple times, adhesive is applied on both sides. The rubber sheet, heating element and rubber sheet are laid flat in the flat mold in turn, and the heating element is positioned by auxiliary fixtures to avoid displacement of the heating element and cause short circuit. After multiple pre-pressing, the residual air between the layers is removed, and pre-molding is performed to ensure the relative position of the heating element, and a flat rubber pad is obtained.

[0024] Then, the insulating layer, flat rubber pad, rubber sheet, rubber cloth and rubber sheet are laid on the surface of the convex mold in turn, positioned with a fixture, and pre-pressed multiple times to remove the residual air between the layers for pre-forming. The heating component is pre-formed and cured through a concave mold, and finally tested after curing.

[0025] In this embodiment, vulcanization molding is used as the curing method.

[0026] Rubber is used as the main body material. Rubber has good wear resistance and toughness, and can meet various friction and torsional deformation requirements of the blades. In this embodiment, modified nitrile rubber is used. The structure of the insulating heat transfer layer in the structural design is rubber sheet-rubber-coated cloth-film. The surface of this structure can withstand sand and dust environment. It is verified that the rubber structure of the manufactured electric anti-icing device meets the requirements of elongation at break ≥300%, hot air aging (125℃×24h) Shore A hardness change / degree 0~+10, bonding strength can reach 4.0kN / m or more, and density ≤1.5g / cm3.

[0027] The structural strength of the electric anti-icing device is verified by producing peeling test pieces to verify that the peeling strength between films meets GB / T2790 "Adhesive 180° Peel Strength Test Method Flexible Material to Rigid Material", the peeling strength between films and stainless steel sheets meets GB / T 2791 "Adhesive T Peel Strength Test Method Flexible Material to Flexible Material", and the peeling strength between the electric anti-icing device and composite materials meets GB / T 2791 "Adhesive T Peel Strength Test Method Flexible Material to Flexible Material", etc., which can meet the requirements.

[0028] The electric anti-icing device adopts a conformal design, and the heating element is designed as a retractable circular structure, which can produce adaptive stretching and contraction deformation with the bending and twisting of the blades, and will not cause stress concentration and lead to strength damage. The lead connector uses a flexible conductor to connect the heating element and the lead wire, which plays a stress buffering role and can prevent the joint from being damaged by fatigue stress.

[0029] During the molding process of the electric anti-icing device, there are certain gap requirements between the circuits of each heating element to avoid short circuit, which would cause the electric anti-icing device to be unusable.

[0030] Descriptions of different advantageous arrangements have been presented for purposes of illustration and description, but the description is not intended to be exclusive or limited to examples of the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. Additionally, different advantageous examples may be described as having different advantages over other advantageous examples. The selected example or examples are selected and described in order to best illustrate the principles of the examples, practical applications, and to enable those of ordinary skill in the art to understand the disclosure as having various examples with various modifications suitable for the particular use contemplated.

Claims

1. A lightweight, wear-resistant blade electric anti-icing device, characterized by: The device is consistent with the aerodynamic shape of the blade, and includes an insulating heat transfer layer, a heating layer and an insulating heat insulation layer from the outside to the inside, wherein the insulating heat transfer layer includes superimposed rubber sheets, rubber-coated cloth and rubber sheets; the heating layer includes superimposed rubber sheets, heating elements and rubber sheets, and the layers of material of the heating layer are laid flat in a flat mold for pre-forming to obtain a flat rubber pad; the insulating heat insulation layer, the flat rubber pad and the insulating heat transfer layer are laid on the punch in sequence, pre-formed and cured to obtain the lightweight wear-resistant blade electric anti-icing device.

2. The light wear-resistant blade electric anti-icing device according to claim 1 is characterized by: The material of the rubber sheet is modified nitrile rubber.

3. The light wear-resistant blade electric anti-icing device according to claim 1 is characterized by: The cross-sectional thickness of the device is 2.9 mm, and the maximum thickness in the wiring area is approximately 4 mm.

4. The light wear-resistant blade electric anti-icing device according to claim 3 is characterized by: The thickness of the insulating heat transfer layer is 1.9 mm.

5. The light wear-resistant blade electric anti-icing device according to claim 3 is characterized by: The thickness of the heating layer is 0.1 mm.

6. The light wear-resistant blade electric anti-icing device according to claim 1 is characterized by: Preforming requires the use of auxiliary fixtures to position the heating element and multiple pre-pressing to remove the residual air between the layers.

7. The light wear-resistant blade electric anti-icing device according to claim 1 is characterized by: The device is bonded by adhesive into a groove on the leading edge of the propeller blade.

8. The light wear-resistant blade electric anti-icing device according to claim 1 is characterized by: The curing method is vulcanization molding.

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