7158-3034-50 Rubber Shell For Automotive Plugs Waterproof Plug Sealing Of Automotive Connectors

01Connector shielding classification

According to the shielding principle, it can be divided into electric field shielding, magnetic field shielding, and electromagnetic shielding.

Electrostatic shielding: Electrostatic shielding mainly prevents the influence of electrostatic fields. Its function is to eliminate interference caused by capacitance coupling between two circuits. In addition, when a grounding conductor is placed between two conductors, the electrostatic coupling between the two conductors is weakened, so it can be said that the grounded conductor also has a shielding effect.

Electromagnetic shielding: The necessary condition for electromagnetic shielding is that high-frequency current flows through the shielding conductor, and the current must be in the direction of counteracting interference magnetic flux. If a slit is opened perpendicular to the current direction, there is no electromagnetic shielding effect.

Magnetic shielding: Magnetic shielding is mainly used at low frequencies, but it is not very effective at low frequencies. Therefore, materials with high magnetic conductivity are used for shielding, in order to limit the magnetic field lines inside the magnetic screen conductor with low magnetic resistance and prevent diffusion to the outside.

02Connector shielding structure

Shielding reed: Shielding reed is commonly used in military circular connectors, such as Y27, YMA, and other series. The following figure shows the commonly used shielding spring structure in connectors. The shielding spring needs to meet the following conditions: ① have good resilience to avoid permanent deformation after compression; ② It has good shielding performance and meets the requirements for shielding performance at gaps. Therefore, the shielding springs in military connectors are mostly made of beryllium bronze material, and the structure of common shielding springs is shown in the figure.

Conductive rubber pad: Conductive rubber pads are often used in situations with high electromagnetic shielding and water vapor sealing. Conductive rubber pads are filled with conductive particles in conventional rubber parts, and the requirements for conductive rubber pads vary depending on the application environment. The selected conductive particles also vary depending on the application field, as shown in Table 1.

The shielding effectiveness of different conductive particles also varies, and Table 2 lists the corresponding shielding effectiveness of different materials.

Circular connector shielding structure: In circular military connectors, the shielding spring is the most critical component to achieve its shielding function, such as the YMA series connector. The shielding spring is assembled in the inner cavity of the socket housing, and when the plug is docked and unplugged with the socket, the originally discrete outer shell is electrically connected through the shielding spring. The shielding spring shell generates a certain amount of pressure and is in close contact with the shell, thereby achieving electrical continuity between the shells.

The use of conductive pads: Conductive pads, also known as EMI pads, are commonly used in the gaps of electronic equipment chassis. The application of circular connectors in military products is also very common. Sockets are fixed and installed on the chassis panel through square flanges. At this time, there will be a certain gap between the square flange and the chassis panel. In order to reduce electromagnetic leakage of this gap, conductive square pads are often installed between the flange and the chassis. The conductive square pad is divided into front and rear mounting based on its relative position with the chassis panel, as shown in the figure.

The main manifestation of terminal failure is terminal ignition, and the air conditioning system may experience malfunctions such as non cooling and tripping. Upon inspection of the faulty compressor, it was found that the insulation and voltage resistance were not qualified, and the internal glass body was melted or there were foreign objects in the wiring terminals. Another fault phenomenon is terminal flushing, which results in extreme abnormal operating conditions inside the rotor compressor. The wiring terminal fails and rushes out of the compressor, causing safety accidents such as burning of the external unit of the air conditioner. The malfunctioning compressor is manifested as the wiring terminal being punched out, some motor windings being burnt out, and the binding rope partially melting and breaking.

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