Method for Controlling the Position of an Electromechanical Actuator for Reciprocating Compressor Valves
AssigneeDott. Ing. Mario Cozzani S.R.L.
InventorsMassimo Schiavone, Andrea Raggi, Carlo Rossi
Life of this patent
Estimating the term…
Abstract
Method for controlling the position of an electromechanical actuator for reciprocating compressor valves. The actuator includes a member (302) movable in a direction parallel to the direction for opening and closing the obturator of the valve (12), between a position corresponding to the closed position and a position corresponding to the open position of the obturator (11). The member (302) is provided with a mechanism (322) able to act on the obturator (11) and with a magnetisable portion (312) co-operating with two electromagnets (102, 202) and being arranged in equilibrium between the latter via a suitable mechanism.
Claims10
Method for controlling the position of an electromechanical actuator for reciprocating compressor valves, said actuator comprising a member movable in a direction parallel to the direction for opening and closing of the obturator means of said valve, between a position corresponding to the closed position and a position corresponding to the open position of said obturator means, said member being provided with means able to act on the said obturator means and with a magnetisable portion co-operating with two electromagnets and being arranged in equilibrium between the latter via suitable means, said method being characterized by the following operational steps of:
- a) release for opening:
- the magnets are energised so as to allow separation of the portion of the movable member from the magnet directed away from the said valve and cause its displacement towards the other magnet;
- b) current-controlled opening:
- the movable member, as a result of the action of the magnets, moves towards the position for opening the obturator means of the valve;
- c) position-controlled opening:
- the current in the magnets is regulated so as to brake the movable member during the final section of its stroke;
- d) retention in open position:
- the movable member is retained in the position for opening the valve obturator means for a given time interval;
- e) release for closure:
- the magnets are energised so as to allow separation of the movable member portion from the magnet directed towards said valve and cause its displacement towards the other magnet;
- f) current-controlled closing:
- the movable member, as a result of the action of the magnets, moves towards the position for closing the obturator means of the valve;
- g) position-controlled closing:
- the current in the magnets is regulated so as to brake the movable member during the final section of its stroke;
- h) retention in closed position:
- the movable member is retained in the position for closing the obturator means of the valve until a new transition signal is generated, for execution of step a) again.
Dependencies are inferred from the claim text.