The core technology of aviation pin plunger connector
Different contact resistance assessment indicators are specified for pin jack connectors of the same specification made of different types of materials, so their electrical parameters are also different.
Positive pressure The positive pressure of the aviation pin socket connector refers to the force generated by the surfaces in contact with each other while being perpendicular to the contact surface. With the increase of positive pressure, the number and area of contact micro-points are gradually increasing, and at the same time, the contact micro-points transition from elastic deformation to plastic deformation. Because the concentration resistance gradually decreases, the contact resistance is reduced. The positive contact pressure is mainly determined by the geometry and material properties of the connecting piece.
First: Surface state of aviation pin jack connector:
1. Because of dust, rosin, oil, etc., a relatively loose surface film is formed by mechanical adhesion and deposition on the surface of the contact. This surface film is especially easy to be embedded in the microscopic pits of the contact surface because of the particulate matter, reducing the contact area, Enhancing the contact resistance, and is particularly unstable.
2. Because of the pollution film formed by physical adsorption and chemical adsorption, the surface of the aviation pin socket is mainly chemically adsorbed, which is produced with the migration of electrons after physical adsorption. Therefore, for some products with high-reliability requirements, such as aviation pin jacks used in aerospace, there must be clear and concise assembly and production environmental conditions, perfect cleaning technology, and necessary structural sealing measures, and the user must have good storage and Use operating environment conditions.
Second: Electrical aspect of aviation pin jack connector:
1. When the applied voltage reaches a certain closed value, the film of the connector will be broken down, and the contact resistance will drop rapidly. But because the thermal effect accelerates the chemical reaction in the area near the film, it has a certain repair effect on the film. Therefore, the resistance value is nonlinear. Near the threshold voltage, small fluctuations in the voltage drop will cause the current to change within a range of twenty times or several tens of times.
2. When the current exceeds a certain value, the metal is softened or melted by the Joule heat generated at the tiny points on the interface of the aviation pin jack connector with electricity, which will affect the concentration resistance, and then reduce the contact resistance.