Pipes and tubular conduits – Repairing
Patent
1991-10-30
1993-11-30
Burr, Edgar S.
Pipes and tubular conduits
Repairing
12820421, 12820423, 12820524, A61M 1600
Patent
active
052655946
ABSTRACT:
An apparatus, such as a ventilator, for regulating the flow-through amount of a flowing medium, such as a gas, has a valve with a variable orifice operated by a first regulating circuit with negative feedback. The regulating variable generated by the first regulating circuit controls the size of the orifice so that the difference between a desired value and an actual value for the flow-through amount os minimized, toward zero. To achieve rapid changes in the flow-through amount with a high regulating precision, at least one further regulating circuit is provided to which the regulating variable of the first regulating circuit is supplied as the desired value. The actual value for the further regulating circuit may be the measured position of the closure element for the orifice. The bandwidth and the gain can be optimized for each regulating circuit. The energy consumption can be lowered by current recovery and battery operation can be simplified, in the event of a power outage.
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Puritan-Bennett 7200 Microprocessor Ventilator Advertising Brochure.
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"A Servo-Controlled Breathing Simulator," Maslen, Royal Aircraft Establishment Technical Report 68213 Aug., 1968.
Cewers Goeran
Dahlstroem Bo
Iderup Mats
Linden Dan
Olsson Sven-Gunnar
Burr Edgar S.
Lewis Aaron J.
Siemens Aktiengesellschaft
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