Composite conductive plastic potentiometer

Abstract

The utility model belongs to the field of attack angle sensor design, and particularly relates to a composite conductive plastic potentiometer. When a wire-wound potentiometer brush brushes on a potentiometer, kick and burrs are generated. After long-term use, wear further reduces the contact reliability between the potentiometer and the brush. A composite conductive plastic potentiometer comprises an arc-shaped mounting base, a conductor and a wire, the mounting base and a base of an attack angle sensor have the same radian, and a plurality of mounting holes are further formed in the two ends of the mounting base and used for fixing the mounting base to the surface of the base. A plurality of parallel conductors are arranged on the surface of the mounting seat along the length direction, the conductors are made of conductive plastics, and the conductors are electrically connected with a circuit board of the attack angle sensor through corresponding leads. And the output is stable, the reliability is high, and the fault probability is low. The hidden danger of high failure rate of a weather vane type sensor adopting a potentiometer due to the defects of a potentiometer-electric brush structure is solved.

Description

Technical Field

[0001] The utility model belongs to the field of attack angle sensor design, and particularly relates to a composite conductive plastic potentiometer. Background Art

[0002] Angle of attack, defined as the angle between an aircraft's wing chord and the relative wind speed, is a crucial atmospheric parameter, making its efficient and accurate measurement crucial. Systems such as the aircraft's fire control system, cruise control system, and stall warning system all rely on this information.

[0003] Currently, the widely used angle of attack sensors can be divided into two categories based on their working principles: mechanical and pneumatic. Mechanical angle of attack sensors mainly use the angle of rotation of the probe to obtain the angle of attack, including wind vane angle of attack sensors and zero pressure differential angle of attack sensors; pneumatic angle of attack sensors obtain angle of attack information through pressure information measured during flight, including pressure differential ratio sensors.

[0004] The principle of a wind vane angle of attack sensor is as follows: when the angle of attack is zero, the vane is parallel to the airflow direction, and the aerodynamic forces acting on both sides of the vane are equal, preventing the vane from rotating. However, when the aircraft flies at a certain angle of attack, the aerodynamic forces acting on both sides of the vane become unequal, creating a pressure differential that causes the vane to deflect. The angle of rotation of the rotating shaft driven by the vane can be converted into a corresponding electrical signal using an angle converter such as a wirewound potentiometer. A wind vane angle of attack sensor features a simple structure and high reliability. Compared to other angle of attack sensors, it is more sensitive to changes in angle of attack, especially at low speeds.

[0005] See also Figure 1 Currently, wire-wound potentiometers have a certain spacing between adjacent turns during winding, resulting in a slight depression between the turns. This creates jerks and burrs when the brush moves across the potentiometer. The contact resistance between the brush and potentiometer creates contact resistance, and excessive contact resistance can also cause the sensor's output voltage to vary. Furthermore, contact resistance is subject to wear, and over time, impurities from this wear can accumulate on the potentiometer's working surface, further reducing contact reliability between the potentiometer and brush. Utility Model Content

[0006] The purpose of the utility model is to provide a composite conductive plastic potentiometer, which overcomes the jump and burr caused by the turn spacing of the existing wire-wound potentiometer and solves the contact reliability problem caused by wear.

[0007] The technical solution of the utility model is: a composite conductive plastic potentiometer, used to replace the wire-wound potentiometer in the angle of attack sensor, including an arc-shaped mounting base, a conductor and a wire, wherein the mounting base and the base of the angle of attack sensor have the same curvature, and a plurality of mounting holes are provided at both ends of the mounting base for fixing the mounting base to the base surface. A plurality of mutually parallel conductors are provided on the surface of the mounting base along the length direction, and the conductors are made of conductive plastic. The conductors are electrically connected to the circuit board of the angle of attack sensor through corresponding wires.

[0008] Advantageously, the mounting seat is made of aluminum alloy.

[0009] Advantageously, the conductor is made of conductive material and plastic powder through molding.

[0010] Advantageously, the total angle of the mounting seat is 100°±0.5°, the working angle range is 68°, and the effective working stroke is 62°.

[0011] Advantageously, the thickness of the electrical conductor is approximately 2 mm.

[0012] Advantageously, the wire is a fluoroplastic wire.

[0013] Conductive plastics are used as resistor materials in potentiometers, enabling the potentiometers to achieve higher output accuracy, faster response, stronger wear resistance, resistance to moisture and heat, resistance to aging, resistance to chemical corrosion, stronger anti-noise capability and longer mechanical life.

[0014] The wind vane tracks the direction of the airflow. When the aircraft's angle of attack changes, the sensor's wind vane deflects and drives the brush to slide on the composite conductive plastic potentiometer, outputting a voltage signal proportional to the angle of attack.

[0015] The advantages of the present invention are that the composite conductive plastic potentiometer does not produce sudden jumps or burrs, has stable output, high reliability, and low failure probability, thus resolving the hidden danger of high failure rate caused by the potentiometer-brush structure defects of wind vane sensors using potentiometers. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the schematic diagram of a wirewound potentiometer;

[0017] Figure 2 This is a front view of an angle of attack sensor using the composite conductive plastic potentiometer of the utility model;

[0018] Figure 3 This is an A-direction view of the composite conductive plastic potentiometer of the utility model. DETAILED DESCRIPTION

[0019] The utility model is described in further detail below.

[0020] refer to Figure 2 The composite conductive plastic potentiometer has a total angle of 100° ± 0.5°, an operating angle range of 68°, and an effective operating stroke of 62°, which is suitable for an angle-of-attack sensor operating angle of ± 30°. The composite conductive plastic potentiometer has an inner diameter of R39.5 mm and an outer diameter of R44.4 mm. The conductive plastic thickness is approximately 2 mm, which is suitable for the base of the angle-of-attack sensor. The eight mounting holes of the composite conductive plastic potentiometer are divided into four groups, each with an included angle of 88.5°. The composite conductive plastic potentiometer is manufactured with the relevant dimensions of the original wirewound potentiometer and can replace the wirewound potentiometer in situ, without the need for additional auxiliary mounting components.

[0021] See also Figure 3 The composite conductive plastic potentiometer is mainly composed of an arc-shaped mounting base 1, a conductor 2 and a wire 4. The material of the mounting base 1 is an aluminum alloy with low density and high strength, and the material of the conductor 2 is conductive plastic. The composite conductive plastic potentiometer is fixed on the base of the angle of attack sensor by screwing 8 screws into the 8 mounting holes 3. The electrical connection of the composite conductive plastic potentiometer is achieved by connecting 8 fluoroplastic wires 4 to the soldering pads on the circuit board of the angle of attack sensor. The conductive material used for conductivity in the composite conductive plastic potentiometer - the conductive plastic has a smooth surface and will not have sudden jumps or burrs. It also has a long enough wear life. After a long period of wear, no non-metallic impurities will appear. During the service life of the product, there will be no output jump failure caused by poor contact between the brush and the potentiometer. The composite conductive plastic potentiometer is installed on the base of the product and replaces the original coil-wound potentiometer in situ, thereby improving the wear life of the product.

Claims

1. A composite conductive plastic potentiometer used to replace the wire-wound potentiometer in an angle of attack sensor, characterized by: The invention comprises an arc-shaped mounting seat (1), a conductor (2) and a wire (4), wherein the mounting seat (1) and the base of the angle of attack sensor have the same arc, and a plurality of mounting holes (3) are provided at both ends of the mounting seat (1) for fixing the mounting seat (1) to the surface of the base, and a plurality of mutually parallel conductors (2) are provided on the surface of the mounting seat (1) along the length direction, wherein the conductors (2) are made of conductive plastic, and the conductors (2) are electrically connected to the circuit board of the angle of attack sensor via corresponding wires (4).

2. The composite conductive plastic potentiometer according to claim 1, characterized in that: The material of the mounting seat (1) is aluminum alloy.

3. The composite conductive plastic potentiometer according to claim 1, characterized in that: The conductor (2) is made of conductive material and plastic powder through molding.

4. The composite conductive plastic potentiometer according to claim 1, characterized in that: The total angle of the mounting seat (1) is 100°±0.5°, its working angle range is 68°, and its effective working stroke is 62°.

5. The composite conductive plastic potentiometer according to claim 1, characterized in that: The thickness of the conductor (2) is about 2 mm.

6. The composite conductive plastic potentiometer according to claim 1, characterized in that: The conductor (4) is a fluoroplastic conductor.

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