The use of connectors is extremely extensive, and connectors are found in all walks of life. In order to improve everyone's understanding of the connector, this article will introduce the two basic contents of the connector: 1. Common terms of the connector, 2. The basic structure of the connector.
1. Common terms of connectors
1. Connector: A separable element (except an adapter) that is usually attached to a cable or device for electrical connection of a transmission line system
2. RF connector: It is a connector used in the RF range.
3. Video: Radio waves with a frequency range between 3HZ∽30MHZ.
4. Radio frequency: radio waves with a frequency range of 3000HZ∽3000GHZ.
5. High frequency: radio waves with a frequency range between 3MHZ∽30MHZ.
6. Coaxial: The inner conductor has a dielectric support, and the structure can obtain the minimum internal reflection coefficient within the frequency range used in the measurement.
7. Triax: A transmission line consisting 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 (Class 2): A connector that is manufactured with the widest allowable dimensional deviation (tolerance), but still guarantees the minimum specified performance and intermateability.
Note: The requirements for reflection coefficient can be specified or not specified.
10. High-performance connector (Class 1): A connector that specifies the limit value of the reflection coefficient according to the frequency change. Usually, the specified dimensional tolerance is not stricter than the corresponding Class 2 connector, but it is necessary to ensure that the connector meets the reflection coefficient. It is the manufacturer's responsibility to select tighter tolerances when required.
11. Standard Test Connector (Class 0): A precision-manufactured specific type of connector used for reflection coefficient measurements on Class 1 and Class 2 connectors, with negligible errors in measurement results.
NOTE: Standard test connectors are usually part of different types of adapters, and adapters and precision connectors form part of the test equipment.
12. Seal
12.1 Sealed connector: a connector that meets the specified gas, moisture or liquid tightness requirements.
12.2 Barrier Seal: A seal that prevents gas, moisture or liquid from entering the interior of the connector housing along the axial direction.
12.3 Panel Seal: A seal that prevents gas, moisture, or liquid from entering through the mounting holes into the mount or between the adapter housing and the panel.
NOTE: Seals are usually available as separate products.
12.4 Mating face seal: A seal at the interface of a pair of mating connectors that prevents gas, moisture or liquid from entering.
12.5 Hermetic seal: a seal that meets the requirements of test Qk in IEC60068-2-17 "Basic Environmental Test Procedures 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 variety); ④accessories.
1. 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 contact piece and the male contact piece.
The male contact is a rigid part, and its shape is cylindrical (round pin), square column (square pin) or flat (insert). The male contacts are generally made of brass and phosphor bronze.
The female contact is the jack, which is the key part of the contact pair. It relies on the elastic structure to elastically deform 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 type (splitting, shrinking), tuning fork type, cantilever beam type (longitudinal slotting), folding type (longitudinal slotting, figure 9), box type (square jack) As well as hyperboloid wire spring jacks and so on.
2. Insulators Insulators are also often referred to as bases or inserts. Its function is to arrange the contacts in the required position and spacing, and to ensure the contact between the contacts and between the contacts and the shell. insulating properties. Good insulation resistance, withstand voltage performance and ease of processing are the basic requirements for selecting insulating materials to be processed into insulators.
3. The shell, also known as 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 when the plug and socket are mated, thereby securing the connector to the device. superior.
4. Accessories Accessories are divided into structural accessories and installation accessories. Structural accessories such as retaining rings, positioning keys, positioning pins, guide pins, coupling rings, cable clamps, sealing rings, gaskets, etc. Mounting accessories such as screws, nuts, screws, spring rings, etc. Most of the accessories have standard parts and general parts.
