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What are the common terms and basic structure of the connector?

August 25, 2020


  1. Commonly used terms for connectors

      1. Connector: a detachable element usually attached to a cable or equipment for electrical connection of a transmission line system (except for adapters)

  2. RF connector: It is a connector used in the radio frequency range.

  3. Video: Radio waves with a frequency range of 3HZ∽30MHZ.

  4. Radio frequency: radio waves with a frequency range of 3,000HZ∽3000GHZ.

  5. High frequency: Radio waves with a frequency range of 3MHZ∽30MHZ.

  6. Coaxial: The inner conductor has a dielectric support, and the structure can obtain the smallest internal reflection coefficient in the frequency range used in the measurement.

  7. Triaxial: A transmission line composed of three layers of concentric conductors with a common axis and insulated from each other.

  8. Grade: The level of the connector in terms of mechanical and electrical precision, especially in terms of the specified reflection coefficient.

  9. Universal connector (level 2): A connector that is manufactured with the widest allowable dimensional deviation (tolerance), but can still guarantee the minimum specified performance and interoperability.

   Note: The reflection coefficient requirements can be specified or not specified.

      10. High-performance connector (level 1): A connector that specifies the limit value of the reflection coefficient according to frequency changes. Usually, the specified dimensional tolerance is not stricter than the corresponding level 2 connector, but it is necessary to ensure that the connector meets the reflection coefficient. When required, the manufacturer is responsible for choosing tighter tolerances.

  11. Standard test connector (level 0): a specific type of precision-manufactured connector used to measure the reflection coefficient of level 1 and level 2 connectors, and the error caused by the measurement results can be ignored.

   Note: The standard test connector is usually part of the adapter between different types, and the connection between the adapter and the precision connector constitutes a part of the test equipment.

12. Seal

   12.1 Sealed connector: a connector that can meet the specified gas, moisture or liquid tightness requirements.

   12.2 Barrier seal: A seal that prevents gas, moisture or liquid from entering the connector housing along the axial direction.

   12.3 Panel seal: Prevent gas, moisture or liquid from entering the seal between the fixed or adapter housing and the panel through the mounting hole.

  Note: Seals are usually provided as separate products.

   12.4 Mating surface seal: a seal to prevent gas, moisture or liquid from entering the interface of a pair of plug connectors.

   12.5 Hermetic seal: the seal that meets the requirements of test Qk in IEC60068-2-17 "Basic Environmental Test Procedure Part 2: Test-Test Q: Seal".

Second, the basic structure of the connector

  The basic structural parts of the connector are ①contacts; ②insulators; ③shells (depending on the type); ④accessories.

   1. Contacts (contacts) are the core parts of the connector to complete the electrical connection function. Generally, a contact pair is composed of a male contact piece and a female contact piece, and the electrical connection is completed by the insertion of the female and male contact pieces.

   The male contact is a rigid part, and its shape is cylindrical (round pin), square cylinder (square pin) or flat (insert piece). The male contact is generally made of brass or phosphor bronze.

   The female contact is the key part of the contact pair. It relies on the elastic structure to be elastically deformed when it is inserted into the pin to generate elastic force to form close contact with the male contact to complete the connection. There are many types of jack structures, including cylindrical (split, necked), tuning fork, cantilever type (longitudinal slot), folding type (longitudinal slot, 9-shaped), box-shaped (square jack) And hyperboloid wire spring jacks, etc.

       2. Insulator The insulator is also often called the base (base) or the mounting plate (insert). Its function is to arrange the contacts according to the required position and spacing, and to ensure the contact between the contacts and between the contacts and the shell. Insulation performance. Good insulation resistance, withstand voltage performance and easy processing are the basic requirements for selecting insulating materials to be processed into insulators.

       3. The shell, also called the shell, is the outer cover of the connector. It provides mechanical protection for the built-in insulating mounting plate and pins, and provides alignment of the plug and socket when mating, and then fixes the connector to the device on.

   4. Accessories The accessories are divided into structural accessories and installation accessories. Structural accessories such as clamp ring, positioning key, positioning pin, guide pin, connecting ring, cable clamp, sealing ring, gasket, etc. Install accessories such as screws, nuts, screws, spring rings, etc. Most of the accessories have standard parts and common parts.