초록 ▼

A combined patient interface and integrated exhaust assembly that passes a controlled flow of gas from an interior of a patient interface to ambient atmosphere at a predetermined flow rate irrespective of variations of pressure in the interior of the patient interface device relative to ambient atmo

A combined patient interface and integrated exhaust assembly that passes a controlled flow of gas from an interior of a patient interface to ambient atmosphere at a predetermined flow rate irrespective of variations of pressure in the interior of the patient interface device relative to ambient atmosphere. Control of the flow of exhaust gas is achieved by varying the effective cross sectional area of the exhaust path communicating the interior of the patient interface with ambient atmosphere based on the pressure in the interior of the patient interface relative to ambient atmospheric pressure.

대표청구항 ▼

A combined patient interface and integrated exhaust assembly that passes a controlled flow of gas from an interior of a patient interface to ambient atmosphere at a predetermined flow rate irrespective of variations of pressure in the interior of the patient interface device relative to ambient atmo

A combined patient interface and integrated exhaust assembly that passes a controlled flow of gas from an interior of a patient interface to ambient atmosphere at a predetermined flow rate irrespective of variations of pressure in the interior of the patient interface device relative to ambient atmosphere. Control of the flow of exhaust gas is achieved by varying the effective cross sectional area of the exhaust path communicating the interior of the patient interface with ambient atmosphere based on the pressure in the interior of the patient interface relative to ambient atmospheric pressure. rst air stream, and a second metering device operative to dispense agricultural materials from a second tank into the second air stream; wherein the microprocessor is operatively connected to receive signals indicating the ground speed of the air seeder, and operatively connected to each metering device to receive signals from each metering device indicating the rotational speed of each metering device; wherein the system is calibrated such that for each metering device a known weight of agricultural material is dispensed into the air stream for each revolution whereby the rotational speed of a metering device multiplied by the known weight per revolution for that metering device results in a known per minute rate of agricultural material being dispensed into the air stream by that metering device; and wherein the microprocessor is programmed to derive an appropriate first fan speed for the per minute rate of agricultural material being dispensed into the first air stream by the first metering device and to derive an appropriate second fan speed for the per minute rate of agricultural material being dispensed into the second air stream by the second metering device and adjusts the speed of the first and second