Vertical spring return valve actuator
AssigneeEunha Machinery Industrial Co., Ltd.
InventorSoon Won Park
Life of this patent
Estimating the term…
Abstract
A vertical spring return valve actuator includes a motor, a first worm gear and a second worm gear driving a sun gear of a planetary gear unit. The sun gear and planetary gears are rotated in a state where a ring gear is fixed by a brake unit during time of a normal operation. Also, a spring shaft, which is coupled to an output shaft of a planetary gear carrier operated cooperatively with the planetary gears , is rotated to permit a valve to be closed. At the time of a blackout, the brake unit is released, so that a spiral spring is unwound to permit the valve to be opened. Further, the valve is opened or closed manually through a valve manual opening and closing unit having a rotation member, a variable worm and a steering wheel.
Claims6
A vertical spring return valve actuator comprising:
- a body;
- a motor disposed inside the body;
- a first worm gear having a first worm formed on a drive shaft of the motor and a first worm wheel adapted to be engaged with the first worm;
- a second worm gear having a second worm extending from a shaft of the first worm wheel and a second worm wheel adapted to be engaged with the second worm;
- a planetary gear unit having a sun gear fixed to a shaft of the second worm wheel, planetary gears adapted to be engaged with the sun gear to roll around the sun gear, and a ring gear adapted to be engaged with the planetary gears to travel around the planetary gears;
- a planetary gear support unit having a planetary gear carrier adapted to support the planetary gears and an output shaft formed on a lower part of the planetary gear carrier wherein the planetary gear carrier rotates with the planetary gears;
- a brake unit disposed on an outer surface of the ring gear and having a brake function;
- a spring return unit having a spring shaft coupled to the output shaft, a spiral spring disposed around the spring shaft, and a stopping means for preventing unwinding of the spiral spring at a breakout state;
- and
- a valve manual opening and closing unit having an eccentric member adapted to be rotated by means of a lever, a variable worm adapted to be rotatable around one end of the eccentric member in such a manner as to be coupled to or separated from a portion of an outer periphery of the ring gear depending on an operation of the eccentric member, and a steering wheel hinge-coupled to an end of the variable worm opposite to the eccentric member.
Dependencies are inferred from the claim text.