Patent FR-2926666-A1 (FR)
Title: Casing with an electromechanical relay for controlling the heating of an electric circuit, comprises base and lid, unit for connecting power circuit of the relay to external power supply, and unit for controlling the connection unit
Inventor: DAVIS BRUCE
IPC: H01H50/02
Filed: 2008-01-23
Abstract: The control casing with an electromechanical relay, comprises a base (21) in which the electromechanical relay is placed and a lid, a unit for connecting a power input (22) of the relay to an external power supply, a unit for controlling the connection unit, and a unit for connecting an output (23) with two output pins. The electromechanical relay is mounted on a relay support turntable (24) held on the base of the casing with interposition of anti-vibration dampers. The power input and the pins for output connection are held on the casing base away from the support turntable. The control casing with an electromechanical relay, comprises a base (21) in which the electromechanical relay is placed and a lid, a unit for connecting a power input (22) of the relay to an external power supply, a unit for controlling the connection unit, and a unit for connecting an output (23) with two output pins. The electromechanical relay is mounted on a relay support turntable (24) held on the base of the casing with interposition of anti-vibration dampers. The power input and the pins for output connection are held on the casing base away from the support turntable. The base of the casing is adapted in a bowl having a lifted periphery defining an interior space of the bowl. The support turntable is laid generally parallel to the casing base and placed in space inside the bowl. Flexible conductors are arranged for providing electrical connection between the relay and the unit for input and output connection. A soft polymerized paste such as a silicone gel fills the volume between the relay support turntable and the casing base, and has a good thermal conductivity. The polymerized soft paste is a bi-component product obtained from two liquid components that is poured in space inside the bowl and then contacted simultaneously with the casing base and the inner face of the support turntable. The electromechanical relay comprises an armature carrying a magnetic circuit excited by a bobbin, a movable plate supplied on the armature and induced by displacing a part by magnetic attraction and other part by a helicoidal spring mounted between the movable plate and armature, and a flexible shock absorber element axially connected between the armature and a coil of the spring. The helicoidal spring comprises a loop of fixed end engaged around a fixed spur transverse to the armature. The shock absorber element is a bushing engaged around the fixed spur. The bushing comprises a first radial face in axial support on the first coil of the spring, and a second lateral face in lateral support against the end loop of the spring. A first power input and a first connection pin of power output form a first branch of circuit, and a second power input and a second connection pin of power output form a second branch of circuit. The relay is electrically connected in series in the first branch of circuit between the first power input and the first connection pin of power output. A fuse is electrically connected in series in the second branch of the circuit between the second power input and the second connection pin of the power output, and is constituted of an intermediate section having reduced section. The intermediate section with reduced section connecting the two end sections are mechanically fixed to the control casing.