Electrical repulsion coil

Abstract

This invention belongs to the field of aircraft de-icing technology, and specifically relates to an electric repulsion coil for aircraft de-icing. The electric repulsion coil includes an upper semi-conductive region and a lower semi-conductive region with identical structures but opposite energizing directions. The upper semi-conductive region is formed by alternating layers of n layers of insulating film and n-1 layers of conductive strips. The middle n-2 layers of insulating film have openings at both ends of the conductive strips, and the n-1 layers of conductive strips are connected at the openings to form a parallel structure. The ends are led out through electrodes and leads, respectively.

Description

Technical Field

[0001] This invention belongs to the field of aircraft de-icing technology, and specifically relates to an electric repulsion coil for aircraft de-icing. Background Technology

[0002] Some surfaces of aircraft components or wind turbine blades are easily exposed to icing environments. Ice formation on these surfaces can significantly affect their performance and cause safety accidents.

[0003] To avoid the hazards caused by icing, the above-mentioned icing phenomena require special devices to remove them. Currently, there are various systems for eliminating ice buildup, among which electric heating de-icing is the most common method. Its layout is simple, its effect is obvious, and theoretically, as long as the provided power is sufficient, it can meet the needs of the vast majority of application scenarios.

[0004] As some applications prioritize lower power consumption, other de-icing methods are already in use. One is airbag de-icing, which involves installing de-icing boots on the surface to be de-iced. These boots include an inflatable membrane used to break up ice. Another method is electro-pulse de-icing, which protects the surface with a shielding layer and uses a high-current electromagnetic vibrator to apply impacts to separate the ice.

[0005] One method utilizes the impact force generated by coil expansion to de-icing the surface. This type of coil is simple to install and easy to test. The key to this de-icing method lies in the coil design. US19970799277A mentions various coil winding methods to adapt to different installation methods or de-icing structures. The electrically repulsive coils all require etching the substrate plane before winding.

[0006] After being wound, the electric repulsion coil needs to be compressed by the impacted surface and then expanded by electricity. During repeated operation, the bending points will have serious fatigue life problems, resulting in coil breakage, which seriously affects the safety of use. Summary of the Invention

[0007] This invention provides an electrically repulsive coil that solves the fatigue life problem of conventional coils during use.

[0008] Technical Solution 1 An electric repulsion coil, the electric repulsion coil comprising an upper semiconducting region and a lower semiconducting region with the same structure but opposite energizing directions; The upper semi-conductive region is formed by alternating layers of n insulating film and n-1 conductive strips; the middle n-2 insulating film has holes at both ends of the conductive strips, and the n-1 conductive strips are connected at the holes to form a parallel structure, with the two ends led out through electrodes and leads respectively.

[0009] Furthermore, the energizing current is a pulsed current, the voltage is between 600-800V, the current needs to be between 1500-1800A, the pulse width is between 2-3ms, and the pulse period is between 0.5-3s. The repulsive force generated by the electric repulsion coil is controlled between 500N-650N. This force is sufficient to basically complete the de-icing of most wing structures. If the force is greater than 800N, the internal structure of some composite structures will be damaged after repeated use, and in severe cases, it may break.

[0010] Furthermore, several conductive strips can be used in series, but the current must be kept consistent and the voltage adjusted according to the impedance. Furthermore, the insulating film is a polyimide film, and the conductive strip is a copper strip.

[0011] Furthermore, the conductive strip has a length of 40-60mm, a width of 2-4mm, and a thickness of 17-23um; the insulating film has a thickness greater than 0.02mm, and its width needs to be extended by 2mm from the width of the conductive strip.

[0012] Furthermore, the magnitude of the force decreases significantly as the length of the conductive strip increases, while the range of the force increases as the length of the conductive strip increases. The length of the conductive strip can be adjusted according to the area of ​​the surface to be de-iced. Furthermore, the polyimide insulating film thickness is only required to meet the insulation characteristics if it is greater than 0.02mm. It can be replaced with an insulating film with higher insulation characteristics, which can reduce the thickness design and increase the force of the electrorepulsion coil, which is beneficial to the design of this conductive strip. Technical Solution Two An electric repulsion coil is formed by winding a rectangular insulating film with a length much greater than its width and a zigzag conductive strip laid along the length direction around a round rod. After winding, the round rod is pulled out and the coil is flattened. The conductive strip has positive and negative electrodes at both ends; The bent area of ​​the flattened Z-shaped conductive strip is provided with a bending-resistant conductive area perpendicular to the corresponding position of the Z-shaped conductive strip.

[0013] Furthermore, the bending zone is calculated according to Archimedes' spiral formula.

[0014] Furthermore, the conductive strips in the shape of the letter Z are wrapped with two layers of insulating film, with the width and thickness of the insulating film being greater than 0.02 mm.

[0015] Furthermore, the length of the zigzag conductive strip is 70-100mm, the width is 2-4mm, and the thickness is 17-23um; the length of the flexural conductive area is 5-6mm, the width is 3-5mm, and the thickness is 17-23um.

[0016] Its beneficial effects include: Through the stacked structure and optimized current distribution, the fatigue problem of traditional coils in the bending area is effectively alleviated, thereby improving the service life. This design enhances the insulation performance and dielectric strength by using a polyimide-copper-polyimide structure in the conductive strip and extending the length of the polyimide film in the current direction. These improvements increase the working efficiency of the coil, making it more reliable and economical in practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. The drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 Schematic diagram of the working principle of the electric repulsion coil; Figure 2 Schematic diagram of the design of the stacked electric repulsion coil; Figure 3 Schematic diagram of the structure of the single-layer insulating film and conductive strip of the stacked electric repulsion coil; Figure 4 Structure diagram of a "zigzag" electric repulsion coil with a protection pole.

[0019] Description of the reference numerals: 1 - Direction of electromagnetic force, 2 - Bending area, 3 - Direction of electromagnetic force in the bending area, 4 - Current direction. 2-1 - Upper connection area, 2-2 - Upper conductive area, 2-3 - Wire, 2-4 - Lower connection area, 2-5 - Current direction. 2-6 - Lower conductive area 3-1 - Substrate material 3-2 - Electrode area 3-3 - Connection area. 4-1 - Polyimide film substrate, 4-2 - Winding direction, 4-3 - Electrode of the coil, 4-4 - Protection pole, 4-5 - Wiring electrode. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setup and method set forth below, but covers any improvements, substitutions, and modifications to the structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0022] In the description of this invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the invention, and should not be construed as limiting the invention. Furthermore, the use of ordinal numbers (e.g., "first and second," etc.) is for distinguishing objects and is not limited to this order, and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, encompassing both direct connection and indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0024] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0026] The electric repulsion coil is the main working element for de-icing. The working principle of this element is that when current passes through the electric repulsion coil, the flattened electric repulsion coil will expand on its own, generating stress.

[0027] like Figure 1 As shown, the effective effect of a traditional electric repulsion coil is the mutual repulsion between the current-carrying wires at both ends. The bending area is the connection part. According to the force analysis, when the wire is stressed and the coil expands, the bending area will move repeatedly, leading to fatigue problems.

[0028] Implementation Method 1 An electrically repulsive coil, the structure of which is shown in the attached figure. Figure 2 As shown, a stacked structure is formed, with the upper and lower parts of the electric repulsion coil made into a single unit, and then fixed by the connecting area.

[0029] Furthermore, the electric repulsion coil structure is composed of layers of conductive strips stacked together, and is divided into an upper half and a lower half based on its function. Furthermore, the current flowing through the upper half is opposite to that of the lower half. The current flowing through the upper half is a pulse current, with a voltage between 600-800V, a current between 1500-1800A, a pulse width between 2-3ms, and a pulse period between 0.5-3s. Further details are attached. Figure 3 As shown, the conductive strip is composed of polyimide-copper-polyimide. Holes are made at the connector positions at both ends. Several conductive strips are stacked and the two ends can be connected by welding at the opening positions, so that the conductive strips are conductive and connected in parallel to form upper / lower semi-conductive areas. Furthermore, the polyimide film thickness of the conductive strip should be greater than 0.02 mm to ensure insulation dielectric strength, and the length and width directions should extend by 10 mm in the dimension of the conductive strip.

[0030] Furthermore, the electrode region can extend the length of the polyimide film in the current direction to facilitate fixation.

[0031] Implementation Method 2 In the structural design of the electrorepulsion coil, one structure is as shown in the attached figure, which is unfolded on the plane of the etched electrode on the polyimide film substrate and made around a circular rod with a diameter of Φ10. The position of each bending area on the unfolded structure can be calculated according to the Archimedean spiral formula.

[0032]

[0033] Furthermore, as shown in the attached figure, a copper electrode with a length of approximately 5-6 mm, a width of 3-5 mm, and a thickness of 17-23 μm is added at the bending area.

[0034] The above detailed embodiments are a description of the present invention. It should not be considered that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the protection scope of the present invention.

Claims

1. An electrically repulsive coil, characterized in that, The electric repulsion coil includes an upper semiconducting region and a lower semiconducting region with the same structure but opposite energizing directions; The upper semi-conductive region is formed by alternating layers of n insulating film and n-1 conductive strips; the middle n-2 insulating film has holes at both ends of the conductive strips, and the n-1 conductive strips are connected at the holes to form a parallel structure, with the two ends led out through electrodes and leads respectively.

2. The electrorepulsion coil according to claim 1, characterized in that, The energizing current is a pulsed current, with a current range of 1500-1800A, a pulse width range of 2-3ms, and a pulse period range of 0.5-3s.

3. The electrorepulsion coil according to claim 1, characterized in that, The insulating film is a polyimide film, and the conductive strip is a copper strip.

4. The electrorepulsion coil according to claim 3, characterized in that, The conductive strip is 40-60mm long, 2-4mm wide, and 17-23um thick; the insulating film is thicker than 0.02mm and 2mm wider than the conductive strip.

5. An electrically repulsive coil, characterized in that, The electric repulsion coil is made of a rectangular insulating film with a length much greater than its width and a zigzag conductive strip laid along the length direction, which is wound around a round rod. After winding, the round rod is pulled out and the coil is flattened. The conductive strip has positive and negative electrodes at both ends; The bent area of ​​the flattened Z-shaped conductive strip is provided with a bending-resistant conductive area perpendicular to the corresponding position of the Z-shaped conductive strip.

6. The electrorepulsion coil according to claim 5, characterized in that, The bending zone is calculated according to Archimedes' spiral formula.

7. The electrorepulsion coil according to claim 5, characterized in that, The conductive strip of the letter "Z" is wrapped with two layers of insulating film, with the width and thickness of the insulating film being greater than 0.02 mm.

8. The electrorepulsion coil according to claim 5, characterized in that, The length of the zigzag conductive strip is 70-100mm, the width is 2-4mm, and the thickness is 17-23um; the length of the flexural conductive area is 5-6mm, the width is 8-10mm, and the thickness is 17-23um.

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