Dispensing – Automatic control – Material level control
Patent
1992-08-24
1994-05-10
Kashnikow, Andres
Dispensing
Automatic control
Material level control
2221445, B67D 508
Patent
active
053100875
ABSTRACT:
Continuous feed, chemical switching unit for supplying an uninterrupted flow of chemical fluid to a processing system including a control unit and a reservoir for containing a predetermined volume of chemical fluid wherein the reservoir is in hydraulic communication with a processing system. A plurality of float level sensors are provided within the reservoir for locating the fluid level in the reservoir wherein at least one level sensor provides an interlock to the processing system when energized to halt the processing system operation, and the other level sensors communicate reservoir level information to the control unit. The switching unit also includes a plurality of replaceable chemical fluid bottles for storing the fluid, e.g. a first active bottle and a second standby bottle, wherein the bottles are in independent hydraulic communication with the reservoir. Each fluid bottle has associated therewith an inert-gas actuated isolation valve for isolating the bottle from the reservoir. A vacuum source is in hydraulic communication with and for drawing a vacuum on the reservoir to cause fluid flow from an active bottle including an inert-gas actuated isolation valve associated therewith for isolating the vacuum source from the reservoir The control unit is responsive to electrical signals from the level sensors, to an input power signal, and to a plurality of user commands, and is operative to generate signals to actuate the vacuum source isolation valve and the bottle isolation valves to switch the source of chemical fluid flow from one bottle to another as the first bottle becomes empty. Finally, an explosion-proof enclosure for housing the switching unit components wherein the enclosure is fitted with an exhaust device to vent explosive gases from the enclosure and is also equipped with a fire extinguishing device.
REFERENCES:
patent: 3810778 (1974-05-01), Wang
patent: 3878970 (1975-04-01), Nezorski
patent: 3960295 (1976-06-01), Horak
patent: 4247018 (1981-01-01), Credle
patent: 4377246 (1983-03-01), McMillin et al.
patent: 4601409 (1986-07-01), DiRegolo
patent: 4637341 (1987-01-01), Switall
patent: 4676404 (1987-06-01), Yamazaki et al.
patent: 5040564 (1991-08-01), Auvoja
patent: 5129415 (1992-07-01), Runyon et al.
patent: 5156298 (1992-10-01), LaRue
Fulton Steven
Orthman Lyle T.
Snodgrass Eric R.
DeRosa Kenneth
Dulin Jacques M.
Feix Thomas C.
Kashnikow Andres
National Semiconductor Corporation
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