Selection of electrical connectors

Users from a large number of various types of connectors to select a connector to meet a series of requirements, is not a simple and easy work. For example, the connector shape and size, structure and insulation material category, the metal material and Zhenju category and termination technology method, etc., are directly related to the system space, performance requirements and interconnection to be. Users can through the basic understanding of the connector, and from the performance requirements to start (such as electrical properties, mechanical properties, environmental performance and termination technology this), choose a satisfactory connector.

Electrical parameter requirements

In the selection of electrical connectors, the first to consider the voltage and current requirements, followed by the electrical parameters to be considered are:

Contact resistance - for low impedance circuits, the connector is connected in series in the circuit, the contact resistance is the key parameter.

Maximum current - limited by the electrical connector and the lead group number to which it is terminated.

Maximum voltage - depends on the gap between the circuits (i.e. contact spacing and creepage distance) and the insulating material used in the connector.

Mechanical parameter requirements

In addition to the space occupied by the connector and the size limitations, the following mechanical parameters must also be considered when selecting connectors:

Vibration and shock - Select the appropriate connector according to the expected vibration and shock requirements. As the aircraft or missile flight speed increases, vibration and shock increases, causing cracks in the insulation mounting plate, wire and contact joints (soldered or crimped) fracture, and even cause the socket to separate, especially at resonance more intense. Insulation mounting right and shell between the rubber ring and elastic insulation mounting plate has a vibration damping or buffer effect.

Locking mode - in order to prevent vibration caused by the separation of the connector, must choose a safe and reliable locking mode. The general locking method is a threaded connection plus safety line, and bayonet locking method is not only good anti-vibration performance, and rapid connection.

Positioning health - in order to prevent similar connectors of the wrong insertion and closure, can be selected at the same time several positioning town structure.

Installation method - indicating whether the front or rear mounting.

Maintenance requirements - as the actual situation of maintenance may not be consistent with the expected connection and separation, so it is necessary to consider the possible maintenance conditions to select the appropriate termination method, installation method, the allowable insertion and closure force.

Requirements for environmental parameters

The environment in which this connector is used and transported has a significant impact on its performance, so it is necessary to select the appropriate connector according to the expected environmental conditions.

Ambient temperature - by the connector in the metal materials and insulating materials to determine the connector's operating ambient temperature.

Moisture or water - Connectors used on the outside of equipment are often subject to environmental conditions of moisture, water penetration and contamination. Connectors with good sealing should be used in this case.

Air pressure - At high altitudes where the air is thin, voltage resistance is reduced. The usual altitude limit is about 30,000 metres.

Corrosive environment - according to different corrosive environments, the selection of the corresponding metal, plastic, plating structure of the connector.

【Operation and use of electrical connectors

■ Connection and separation

Connector plug and socket connection, because the plug and socket has a blind plug function, first of all, the head of the guide section into the socket, and then rotate the pod, to be five keys

Bit of correct positioning, and then clockwise rotation of the connection nut, three card nail quickly into the three curve slot, and then rotate 120 "or so, you will hear" what" sound, which

When the plug and socket has been correctly positioned, and the plug, socket has been locked. Separation, gently force forward to push the connection nut, and counterclockwise rotation, plug and

socket will be separated smoothly.

■ When wiring the connector, it must be terminated according to the corresponding contact serial number.

■Connectors should not be energised until the m-steel is tightened.