Fluid handling – Processes
Patent
1997-03-17
1999-10-26
Ferensic, Denise L.
Fluid handling
Processes
1374875, 25112911, 251122, 1394352, F16K 3112
Patent
active
059709960
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Field of the Invention
The invention concerns a throttling valve for compressed air or the like and comprising a first valve component and a second valve component which together subtend an adjustable throttling gap, further an electric drive to displace at least one of the valve components for the purpose of adjusting the size of the throttling gap.
Electromagnetically driven throttling valves are already known, which comprise an armature fitted at its end with a plunger subtending a throttling gap together with a stationary component. The plunger-fitted armature can be displaced against a spring force by means of a current-fed coil. As a rule the spring biases the armature toward the closed position. The plunger position is controlled by changing the current in the coil. Thereupon the plunger assumes a position wherein the magnetic force and the spring force are balanced.
As regards such throttling valves, the plunger position and hence in fact the adjusted magnitude of the throttling gap depends on the tolerances for the spring constants and the tolerances affecting the magnetic drive. Most of the time comparatively complex control of the applied current is also required in order that a constant force be applied to the armature by means of a constant current into the coil regardless of coil temperature.
In such throttling valves, furthermore, the applied feed pressure of the compressed air and the flow of the compressed air through the throttling valve will affect the plunger position. This feature is especially disadvantageous when the feed pressure and/or the magnitude of the throttling aperture are changing.
Moreover such throttling valves evince hysteresis, and as a result the precise plunger position is determined not only by the coil current but also by the plunger's direction of motion.
Again the plunger position of such throttling valves will be affected by vibrations. Therefore such throttling valves are poorly suited for use in looms because looms generate vibrations by the beat motion of the reed and/or by displacements of the weaving frame.
BRIEF SUMMARY OF THE INVENTION
The object of the invention is to create a throttling valve of the initially cited species making it possible to accurately set predetermined throttling gaps and such that the valve is vibration-insensitive.
This problem is solved by the electric drive comprising a motor displaceable by a control and/or regulation unit into predetermined positions in order to set throttling gaps of predetermined sizes.
In such a throttling valve, throttling gaps may be set precisely and then may be kept accurately in place even if the throttling valve is mounted in a vibration-generating loom. The size of the adjusted throttling-gap furthermore is insensitive to changes in the feed pressure of the compressed air and/or into the flow of compressed air. As a result the magnitude of the throttle aperture and thus the degree of throttling can be set precisely.
In a preferred embodiment of the invention, the electric drive includes a stepping motor. The desired sizes of the throttling gap can be obtained very accurately using such a stepping motor.
Where an especially fine control of the throttling-gap sizes is desired, another embodiment of the invention provides that a reducing gear be mounted between the motor and the valve component it displaces. As a result and in particular when using a stepping motor, the design-determined angular motor motions between the individual steps can be reduced to comparatively small adjustment displacements of the valve component(s). Another advantageous embodiment provides a helicoidal gear set between the plunger and the motor. This helicoidal gear set offers the advantage that it directly converts the motor rotation into translation.
In a further embodiment of the invention, the two valve components are a plunger and an essentially cylindrical valve seat which are mutually axially displaceable to adjust the throttling gap.
In yet another embodiment of the invention, the two
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Lewyllie Dirk
Markey Hugo
Peeters Jozef
Farid Ramyar
Ferensic Denise L.
Picanol NV
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