Solenoid assembly

Details Solenoid assembly Solenoid assembly

H - Electricity

01

F

310/60

H01F 7/16 (2006.01)

Patent

CA 2035924

ABSTRACT OF THE DISCLOSURE "Solenoid Assembly" A solenoid assembly for the actuation of a valve or the like in a downhole tool comprises a first yoke (2), coil (52) and armature (18) and a second yoke (12), coil (53) and armature (32), the second armature (32) being fixed to a shaft (40) and having a planar end face spaced from a planar end face of the second yoke (12) by a second distance, and the first armature (18) being slidable upon the shaft (40) and having a non-planar end face spaced from a complementary non-planar end face of the first yoke (2) by a first distance less than the second distance. Energisation of the coils (52, 53) causes the first armature (18) to move towards the first yoke (2) until it mates therewith, thereby engaging a shoulder of the shaft (40) and moving the second armature (32) towards the second yoke (12), the second armature (32) subsequently mating with the second yoke under the attractive force between their planar faces.

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