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

1995-02-14

1996-10-15

Nguyen, Hoang

Valves and valve actuation

Electrically actuated valve

Rotary electric actuator

25112913, 137554, F16K 3102, F16K 3700

Patent

active

055646778

ABSTRACT:
A linear actuator for actuating a valve or other control element. The actuator measures 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 friction 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 rotation 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.

REFERENCES:
patent: 3675751 (1972-07-01), Fortner
patent: 4884590 (1989-12-01), Eber et al.
patent: 4898362 (1990-02-01), Leon
patent: 4949937 (1990-08-01), Waldrum
patent: 5137257 (1992-08-01), Tice
patent: 5152308 (1992-10-01), Koch
patent: 5156373 (1992-10-01), Boyles et al.
Buttler, "Reibungsfedern Bauart Ringfeder im Maschinenbau", Konstuktion, vol. 22, No. 4, 149-153 (1970).

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