Fluid handling – Systems – Sequentially closing and opening alternately seating flow...
Patent
1995-01-25
1996-05-21
Nilson, Robert G.
Fluid handling
Systems
Sequentially closing and opening alternately seating flow...
F16K 1110
Patent
active
055180310
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a pneumatic solenoid valve comprising: at least two paths including a first inlet connected to a first pressure source and an outlet connected to a chamber at controlled pressure; a hollow body into which there emerges each of the paths so as to be set in communication therein in a selective fashion, with at least one other path; and an electromagnet secured to the body and including a core plunger capable of actuating means suitable for establishing said selective communication a second inlet connected to a second pressure source, the pressure of the first pressure source being relatively high, and the pressure of the second pressure source relatively low, and the means suitable for establishing said selective communication comprise a stationary valve and a movable valve housed in the hollow body, it being possible for the stationary valve to be open when the movable valve is closed, and vice versa.
Insofar as such solenoid valves are capable of being used in braking systems, which are mass-produced and subject to very strict manufacturing cost constraints, one object of the invention is to propose a solenoid valve making it possible to adjust the pressure in one chamber as a function of an electrical signal, and in which the structure nevertheless remains sufficiently simple for manufacturing to be easy and relatively inexpensive.
To this end, the solenoid valve of the invention is essentially characterized in that the second inlet is located beyond the first inlet with respect to the outlet and in that the means suitable for establishing said selective communication further comprise: outlet and carrying a first valve element of annular shape pointing towards this outlet, extending in a plane which is substantially perpendicular to the axis, and intended to interact with a second valve element so as to form, together with it, said stationary valve; capable of being displaced by the core plunger of the electromagnet, along the axis and towards the outlet, so as to interact with a fourth valve element and to constitute with it said movable valve, this third valve element extending in a plane which is distant from the stationary valve and substantially perpendicular to the axis, and; second valve element and a second end of which carries said fourth valve element, the second valve element being urged in the direction of the first valve element at least by a return spring towards a position for closing the stationary valve in which the latter, the shaft, and the stopper member together prevent any communication between the first inlet and the outlet whilst, in the absence of actuation of the electromagnet allowing a communication between the second inlet and the outlet through the movable valve and, with the third valve element urged by actuation of the electromagnet, in the direction of the fourth valve element into a position for closing the movable valve in which the latter and the sealed surface prevent any communication between the second inlet and the outlet whilst allowing, at least for a minimum predetermined actuation force of the electromagnet, a communication between the first inlet and the outlet through the stationary valve, this stopper member in any position preventing any communication between the two inlets.
Preferably, the tubular stopper member defines, together with the first valve element on the one hand, and with the third valve element on the other hand, substantially equal pressure-application surfaces and the outlet as well as the electromagnet are located on said axis, whilst the two inlets emerge onto the periphery of the hollow body, at a distance from the axis.
According to a preferred embodiment, said sealed surface has a central zone which is axially remote from the periphery of this surface in the direction of the outlet, and forming a concavity pointing towards the electromagnet; this sealed surface is then urged towards the electromagnet by an elastic force acting on its periphery, and the core plunger of the electromagnet acts on a first end
REFERENCES:
patent: 3354894 (1967-11-01), Stoll
patent: 3605813 (1971-09-01), Nakano
patent: 4077674 (1978-03-01), Doto
patent: 4117865 (1978-10-01), Beck
patent: 4499921 (1985-02-01), Stoll
patent: 5248191 (1993-09-01), Kondo et al.
Castel Philippe
Kervagoret Gilbert
AlliedSignal Europe Services Techniques
McCormick Jr. Leo H.
Nilson Robert G.
Palguta Larry J.
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