Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1996-07-17
1998-08-25
Ferensic, Denise L.
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
4354, 251 33, 13762413, 13762415, F16K 3112
Patent
active
057975825
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a method for controlling a distribution device ensuring in succession firstly the feeding of a capacitor with a compressed gaseous fluid, and secondly the abrupt discharging of this capacitor to an installation exploiting the compressed fluid.
The invention also concerns means to implement this control method and a device equipped with said means.
The invention is more particularly--but not restrictedly--applicable to improving the flow of granular or pulverulent substances at the outlets on installations, such as silos or hoppers.
DESCRIPTION OF RELATED ART
A distribution device of the type mentioned above is a device which, when fed with fluid under pressure, is interrupted by an appropriate device, and especially when the feed pressure is brought down to atmospheric pressure, it ensures the abrupt discharging of the capacitor with which it is operationally associated.
The document FR-A-2.660.395 describes such a device including a body having:
a variable volume feed chamber provided with firstly an orifice for feeding with the gaseous fluid compressed to said feed pressure, and secondly a passage for this gaseous fluid to the capacitor, and
also a variable volume chamber for discharging towards the installation fitted with the device, said chamber being provided to this effect with a cut delimiting a passage channel for the fluid accumulated in the capacitor, said cut being bordered by a sealing seat for cooperating imperviously with the bearing surface of a sealing element having a specific weight, and secondly being connected to the installation by a pipe known as an evacuation pipe which starts from the seat.
The passage of the fluid to the capacitor is firstly extremely narrow so as to limit the risk of introducing pulverulent particles, and secondly is extended so that the total section of the passage is sufficient for quickly feeding the capacitor with fluid under pressure.
The sealing member is firstly mobile between two opposing positions, that is in one where it cooperates via its bearing surface with the seat of the evacuation pipe, and in another where it is widely distanced from the seat of said pipe, and secondly includes:
a first face which is exposed to the action of the fluid at the pressure when said fluid is directly located in the feed chamber,
a second face which is opposite the first face and is exposed to the action of the fluid at the pressure when said fluid is located directly in the capacitor,
a third face which is also opposite the first face and exposed to the action of the fluid at the pressure when said fluid is located in the evacuation pipe.
So that discharging is abrupt, this requires that not only must feeding be interrupted, but also that the feed chamber is abruptly emptied.
If the above does not occur, the air it contains and which could only be evacuated through said narrow passage would stop the backward movement of the piston.
As regards known embodiments, for this abrupt emptying of the feed chamber, this is effected by the control device when said chamber is connected to the atmosphere.
Known devices have the drawback of being noisy.
In fact, the sudden emptying of the feed chamber into the atmosphere causes a particularly powerful detonation.
SUMMARY OF THE INVENTION
One of the results the invention seeks to obtain is providing a device of the type mentioned above which, in relation to known devices, possesses a particularly attenuated sound transmission level.
Known devices have the drawback of having a low discharge speed.
Another of the results the invention seeks to obtain is to provide a device of the type mentioned above which, compared with known devices, possesses a significantly increased speed of passage from the feed state of the capacitor to its emptying state.
To this effect, the invention concerns a method for controlling a distribution device of the type mentioned above, wherein, so as to reduce the pressure in the fluid feed chamber and thus obtain the abrupt opening of the sealing member
REFERENCES:
patent: 2426065 (1947-08-01), Stevens et al.
patent: 3677294 (1972-07-01), Gibbs et al.
patent: 4201362 (1980-05-01), Nishimi et al.
patent: 4233698 (1980-11-01), Martin
patent: 5290007 (1994-03-01), Lueues et al.
patent: 5435019 (1995-07-01), Badders
Ferensic Denise L.
Kim Joanne Y.
Kondracki Edward J.
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