Valves and valve actuation – Electrically actuated valve – Including solenoid
Patent
1996-02-06
1997-10-28
Lee, Kevin
Valves and valve actuation
Electrically actuated valve
Including solenoid
25112905, 25112921, F16K 3106
Patent
active
056810261
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a novel type of solenoid valve which can be used to connect two circuits maintained at different pressures in order to ensure flow of a fluid (liquid or gaseous) from a high pressure zone to a low pressure zone.
It more particularly concerns a novel type of solenoid valve whose design is such that it makes it possible to obtain equally well: when it is open/shutoff of the circulation when it is closed), extremes, and flow between two predetermined parameters, with the possibility of adjustment between said values.
In the rest of the description, the invention will be described with reference to a solenoid valve interposed on the length of a circuit, one end of which is open to the outside air, the high pressure at the inlet of said circuit then being equivalent to atmospheric pressure, and the outlet of which is connected, for its part, to a suction system (vacuum pump) therefore corresponding to the low pressure circuit of the assembly.
It is clear that this does not imply any limitation, and that a valve of such type could be interposed on any type of circuit including a high pressure inlet, regardless of its value, and an outlet at a lower pressure.
Conventional solenoid valves of this type essentially including a plunger subjected to the action of return means (springs) and whose displacements, optionally controlled pneumatically and making it possible to interrupt or allow the passage of a fluid flow between an inlet circuit and a discharge circuit at a lower pressure, are not suitable for solving such a problem. This is because, these solenoid valves in general require heavy cores resulting in high inertia. They are furthermore difficult to use on low pressure circuits for which it is also desired to obtain a high flow rate, while having a very short response time of the order of a few milliseconds. They are furthermore designed to ensure a predetermined flow rate, which requires the use of a plurality of solenoid valves that can be controlled independently of each other, when it is desired to adjust this flow rate.
Variable flow solenoid valves also exist, but they are not suitable when it is desired to obtain high flow rates and to have short response times, making it possible to vary the flow rate of a fluid between two zones subjected to different pressures rapidly and at a frequency which may be variable.
In order to open and close a solenoid valve, it was long ago proposed, as disclosed by Patents U.S. Pat. No. 3,758,071, GB-A-2 124 342 and DE-A-3 133 060, to use a closure assembly which can be moved inside a chamber connecting two circuits maintained at different pressures and can, under the action of an electromagnetic force, close the inlet (or the outlet) of one of the circuits when it is decided to cut the flow and which, in the absence of an electromagnetic force, is returned toward the outlet (or inlet) of the second circuit, but without closing it, so that a continuous flow of fluid is obtained in this position.
However, no solution described in these documents makes it possible to envisage production of a solenoid valve having the operational possibilities as summarized in the preamble and which therefore leads not only to the possibility of having high, adjustable fluid flow rates but also to the possibility of having dynamic operation requiring a very short response time, of the order of a few milliseconds, making it possible to have a controlled variable flow rate of the air flow between two predetermined mined values with the possibility of adjustment between said values.
SUMMARY OF THE INVENTION
A novel type of solenoid valve has now been found, which has a particularly simple design and makes it possible to solve all these problems, and it is this solenoid valve that constitutes the subject matter of the present invention.
In general, the invention therefore relates to a variable flow solenoid valve, without return spring, which allows connection of two circuits maintained at different pressures, in order to ensure
REFERENCES:
patent: 4729368 (1988-03-01), Guitay
patent: 5158263 (1992-10-01), Shimizu et al.
Lee Kevin
LPG Systems
LandOfFree
Solenoid valve and massage apparatus employing such a solenoid v does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Solenoid valve and massage apparatus employing such a solenoid v, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solenoid valve and massage apparatus employing such a solenoid v will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1020764