Technical Parameters and Mechanical Properties of Circular Connectors
The circular connector is a type of connector with a cylindrical basic structure and a circular mating surface. In the interconnection classification, it belongs to category 5 and is used for interconnection between devices. Broadly speaking, it includes low-frequency circular connectors, radio frequency coaxial connectors and audio connectors. The cylindrical structure of the circular connector has natural sturdiness and higher strength than any other shape.
Features of circular connectors
1. The circular electrical connector has advanced structure, convenient use, high reliability, and conforms to the national standard GJB2889;
2. Adopt bayonet connection, pins and jacks can be installed and removed separately;
3. The socket adopts a wire spring structure, and the pin and socket lead adopt crimping and welding forms;
4. There are nine models for each type, with a total of 32 hole arrangements for 1-62 cores. Including XC-basic type (crimping), XCH-socket welding type, XCB-socket for printed board welding type, sealed, double-head sealed shielding, non-shielding, etc.;
5. In order to ensure the matching with various specifications of cables, various cable accessories such as FJA, FJC, FJD, etc. can be selected;
6. Widely used in aviation, aerospace, post and telecommunications, computers, navigation and various instruments, meters and other equipment.
7. Use environmental conditions:
(1) Relative humidity: 95% at 40℃
(2) Working height: 30000m
(3) Vibration: frequency 10～2000HZ, acceleration 196 m/s2 (20g)
(4) Impact: peak acceleration of 980 m/s2 (100g)
(5) Constant acceleration: 980 m/s2 (100g)
(6) Air tightness: 50.7KPa through the wall sealed socket; Square plate sealed socket 152KPa
(7) Mechanical life: ≥ 1000 times
Q-type circular electrical connectors are manufactured according to the standard SJ1744-81 of the Ministry of Electronics Industry. The product structure is reliable and easy to operate. The pins and socket leads are welded. According to user needs, plugs and sockets can be equipped with pins or holes. The product has the characteristics of small size, light weight, fast connection, fast separation, etc., and is widely used in electrical connection between instruments, meters and electronic equipment.
Mechanical properties of circular connectors
1. Shell: aluminum alloy
2. Surface treatment: Army green cadmium (B) electroless nickel plating (F)
3. Insulation mounting plate: thermoplastic material
4. Sealing ring: silicone rubber elastomer
5. Contact: copper alloy
6. Surface treatment: gold plating on nickel
7. Life: 500 plug cycles — Impact: 2940m/s2 3ms
8. Vibration:
Sine 294m/s2 10～2000Hz
Random 96(m/s2)2/ Hz 408 m/s2, 100～1000Hz
Random 480( m/s2 )2/ Hz, 100～300 Hz
9. Contact retention force (minimum)
#22D:44N #16:111N #8 Coaxial: 111N
#20:67N #12:111N #8 Triaxial: 111N
10. Electrical performance
Withstand voltage (Vrms) rated conditions for use: 21000m at sea level.
1. Shell: aluminum alloy
2. Surface treatment: Army green cadmium (B) electroless nickel plating (F)
3. Insulation mounting plate: thermoplastic material
4. Sealing ring: silicone rubber elastomer
5. Contact: copper alloy
6. Surface treatment: gold plating on nickel
7. Life: 500 plug cycles — Impact: 2940m/s2 3ms
8. Vibration:
Sine 294m/s2 10～2000Hz
Random 96(m/s2)2/ Hz 408 m/s2, 100～1000Hz
Random 480( m/s2 )2/ Hz, 100～300 Hz
9. Contact retention force (minimum)
#22D:44N #16:111N #8 Coaxial: 111N
#20:67N #12:111N #8 Triaxial: 111N
10. Electrical performance
Withstand voltage (Vrms) rated conditions for use: 21000m at sea level.
Technical parameters of circular connectors
1. Contact resistance: (including wire resistance when measuring)
#22D: 14.6mΩ #20: 7.3mΩ
#16: 3.8mΩ #12: 1.8mΩ
2. Insulation resistance: greater than or equal to 5000MΩ (500V DC)
3. Rated current of contact:
#22D:5A #20:7.5A #16:13A #12:23A
4. Shell conductivity:
Army green cadmium plating: 2.5mV
Nickel plating: 1mV
5. Blocking:
100MHz is 90dB, 1GHz is 85dB
65dB at 10 GHz
6. Coaxial contact:
Operating frequency: 0～1GHz Characteristic impedance: 50Ω
Voltage standing wave ratio is less than or equal to 1.3
7. Triaxial contact:
Frequency bandwidth 0～20 MHz
Rated voltage: 500V AC max. 125V AC at 21000m
Inner and middle contacts: less than or equal to 55mV under 1A
External contact: less than or equal to 75mV at 12A
8. Temperature range:
Cadmium plating (B): -65℃～+175℃
Nickel plating (F): -65℃～+200℃ — Salt spray: 500h (B type) 48h (F type)
9. Damp heat: 24h per cycle, 10 cycles
10. Liquid immersion: resistant to 11 kinds of solvents such as hydraulic oil, lubricating oil, and refrigerant.
Composition of circular electrical connector
A kind of in-line steel ball quick lock circular electrical connector shell assembly: It is composed of a plug and a socket. The plug shell assembly is composed of seven parts: a shell, a lock sleeve, a reed, a pin, a steel ball, a shrapnel, and a gasket. After the lock sleeve and the shell are assembled, the pins are inserted from the shell and riveted on the lock sleeve. The lock sleeve and the shell are provided with a 20-degree rotation. 3-4 steel balls are installed in the plug shell to lock the connection. The lock sleeve is provided with a straight groove, and the steel ball is fully retracted into the shell wall when it is not supported; After insertion, the rotating lock sleeve supports the steel ball to protrude from the inner wall of the shell, and then extends into the annular groove on the socket shell to lock the plug and the socket. It also has anti-oblique insertion, anti-error insertion, excellent electrical performance and shielding performance. Anti-vibration, anti-shock, environmental resistance and other advantages. Locking and unlocking is convenient and quick, and the volume is small and convenient to use.
