Linear actuator with force switch for detecting axial load

Details Linear actuator with force switch for detecting axial load Linear actuator with force switch for detecting axial load

H - Electricity

02

K

H02K 7/06 (2006.01) F16H 25/20 (2006.01) F16K 31/04 (2006.01)

Patent

CA 2168611

A linear actuator for actuating a valve or other control element. The actuator is characterized by means for measuring the in-line or axial force exerted on a drive sleeve after the valve disk engages the valve seat or back seat In response to detection of an axial force in excess of a predetermined threshold level, the motor is de-energized. The linear actuator includes a drive sleeve rotatably supported by bearings; a pack of fric- tion springs for axially supporting the drive sleeve; a drive motor for driving rotation of the drive sleeve by way of gearing; a ball screw nut coupled inside and coaxial with the drive sleeve such that the ball screw nut rotates with the drive sleeve; a ball screw which translates axially in response to rotation of the ball screw nut; an anti-rotation device for preventing rota- tion of the ball screw during its translation; a switch for controlling the ON-OFF state of the motor; and a mechanical assembly for actuating the switch in response to a predetermined amount of axial deflection of the drive sleeve.

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