An electrical connector plug is an electromechanical component that is connected to an electrical circuit. Therefore, the electrical parameters of the aviation plug itself are the first consideration in the selection of aviation plug. The correct selection and use of the bullet connector is an important aspect to ensure the reliability of the circuit.
Terminal connectors are classified in different ways. According to the frequency, there are high-frequency aviation plugs, and according to the shape, there are low-frequency waterproof water connectors. There are circular connectors, which can be divided into watertight electrical connectors for cabinets, audio equipment, power supply, special purposes, etc. The following mainly discusses the selection method of low-frequency aviation plugs (frequency below 3MHz).
Number of contacts and pinholes
The number of contact pairs should preferably be selected according to the needs of the circuit, taking into account the bulk of the electrical connector and the total separating force. Of course, the number of contact pairs is large, and the total separation force is also relatively large. When some reliability requirements are high and the volume permits, two pairs of contact pairs can be used in parallel to improve the reliability of the connection.
Vibration, shock and impact
The electrical continuity of the contact pair during vibration is mainly considered for the impact and collision of the aviation plug under the specified frequency and acceleration conditions. Under the action of this dynamic stress, the contact pair will be opened instantaneously. The specified instantaneous breaking time is generally 1 μs, 10 μs and 100 μs. 1 ms and 10 ms. Attention should be paid to how to judge the fault of instantaneous contact disconnection. It is now generally accepted that when a contact pair (contact) is closed,When the voltage at both ends drops by more than 50% of the electromotive force of the power supply, it can be judged that the closed contact pair (contact) is faulty. That is to say, there are two conditions to judge whether the instantaneous interruption occurs: duration and voltage drop, both of which are indispensable.
Connection mode
The waterproof bulkhead connector is generally composed of a plug and a socket, in which the plug is also called a free end waterproof hydraulic connector. The socket is also called a fixed aviation plug. The connection and disconnection of the circuit are realized through plugs, sockets and plugging, so that various connection modes of the plugs and the sockets are generated. For the round aviation plug, there are mainly three ways: threaded connection, bayonet connection and marble connection. Threaded connections are the most common.The processing technology is simple, the manufacturing cost is low, and the application range is wide, but the connection speed is slow, and the device is not suitable for occasions requiring frequent plugging and rapid connection. The three bayonet slot leads of the bayonet connection are longer, and the connection speed is faster. But its manufacture is more complex and its cost is higher. The billiard connection is one of the three fastest connections. It does not need rotary motion, but only linear motion to realize the functions of connection, separation, locking and so on.Because it belongs to the direct push-pull connection mode, it is only applicable to the aviation plug with small total separation force. It is commonly used in small aviation plugs.
Installation method and appearance
The installation of waterproof electrical connectors includes front installation and rear installation. Installation and fixing methods include rivet, screw, circlip or quick locking of aviation plug itself. Still another type of plug and socket is the free end aviation plug, also known as the relay aviation plug.
Environmental parameters
Environmental parameters mainly include ambient temperature, humidity, rapid temperature change, atmospheric pressure and corrosive environment. The environment in which electrical connectors are used, stored and transported has a significant impact on their performance, so the appropriate aviation plug must be selected according to the actual environmental conditions.
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