Valves and valve actuation – Electrically actuated valve – Including solenoid
Patent
1997-08-22
1998-10-13
Ferensic, Denise L.
Valves and valve actuation
Electrically actuated valve
Including solenoid
2511291, 2511292, 335278, 335281, F16K 3102
Patent
active
058201009
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates principally to an electromagnetic linear actuator designed to control a low-amplitude displacement.
This type of actuator may be used in numerous fields wherever there is a need to control a low-amplitude linear displacement. It is of particular interest in fields such as aeronautics and aerospace where reducing the weight and dimensions of actuators is crucial.
The invention also relates to a fluid regulator in which at least one valve is controlled by an actuator according to the invention and designed particularly for use in ensuring the ergol supply of satellite engines.
2. Discussion of the Background
Existing electromagnetic actuators comprise a ring-shaped stationary assembly mainly constituted of means of electromagnetic control. Activating these electromagnetic control means creates a magnetic flux that controls the linear displacement of a magnetic core composed of a cylindrical rod housed in such a way as it can slide inside the stationary assembly.
Such existing linear actuators can be divided into two structurally-different groups depending on whether they are of the monostable or bistable type.
In monostable linear actuators the means of electromagnetic control consist solely of a trip coil. The power supply of this coil controls the displacement of the movable coil in a direction determined by the direction of the current passing through the coil. Displacement of the core in the opposite direction, determining the rest state of the actuator, may be effected by gravity, by a spring built into the actuator or by return means built into the apparatus controlled by the actuator.
In bistable linear actuators the means of electromagnetic control comprise at least one trip coil and at least one permanent magnet. The power supply of the coil or coils determines whether the movable core is displaced in one or the other direction depending on the direction of the current without the need for means of returning the core.
Both monostable and bistable movable core electromagnetic linear actuators are relatively large in size and are consequently relatively heavy when a high magnetic flux is required.
In addition, using a movable core requires the creation of parts whose surfaces in friction contact with one another are permeable to the magnetic flux. The choice of materials available is consequently very limited and generally ill-suited to this type of friction contact.
Furthermore, movable core linear activators are usually manufactured completely separately using different parts for monostable and bistable type systems, which tends to increase production costs.
SUMMARY OF THE INVENTION
The aim of the present invention is to produce an electromagnetic linear actuator whose original design reduces size and weight for a given force compared with movable core actuators using the known art.
The invention also relates to an electromagnetic linear actuator whose original design gives prolonged service life and reduces heating compared with movable core linear actuators by enabling the movable cylindrical rod to be made of any friction-resistant material.
A further aim of the invention is to produce an electromagnetic linear actuator that can be made monostable or bistable by simply replacing the electromagnetic control means, thereby significantly reducing manufacturing costs when compared with existing actuators.
These three objectives are achieved by the invention using an electromagnetic linear actuator comprising: working from the outside inwards, a magnetic outer shell, electromagnetic control means and a magnetic inner core, two spacers being placed between the outer magnetic shell and the magnetic inner core on either side of the electromagnetic control means, and removable fastening means mechanically linking the magnetic inner core and the outer magnetic shell via the spacers, and electromagnetic control means are activated, said movable assembly including at least one first magnetic plate positioned facing a first extrem
REFERENCES:
patent: 1700228 (1929-01-01), Kendall
patent: 3201661 (1965-08-01), Koutnik
patent: 3891952 (1975-06-01), Winter et al.
patent: 4994776 (1991-02-01), Juncu
patent: 5143118 (1992-09-01), Sule
patent: 5314164 (1994-05-01), Smith
patent: 5433244 (1995-07-01), Sule
Fontaine Laurent
Frere Jean Yves
Tallend Claude
Aerospatiale - Societe Nationale Industrielle
Ball John
Ferensic Denise L.
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