Fluid handling – Flow affected by fluid contact – energy field or coanda effect – Means to regulate or vary operation of device
Patent
1988-09-14
1989-10-10
Joyce, Harold
Fluid handling
Flow affected by fluid contact, energy field or coanda effect
Means to regulate or vary operation of device
98 4209, 98116, 98DIG10, 1375278, 181224, 181225, F24F 1102
Patent
active
048723983
ABSTRACT:
An improved air vent throat of indoor ventilating device capable of preventing noise where in an outlet throat is installed at the air exhaust port to connect the vent windpipe of the device for bettering the air flow and vibration, a concave check valve toward the direction of the device is provided inside the throat so as to exhaust the air flow which has an action of enlarging the air flowing out through the throat and check valve to prevent the air flowing back into the door when the device is stopped running. The bent windpipe is inwardly extended and gradually enlarged from the air inlet end thereof and then gradually narrowed toward the air outlet and thereof to be an air flow connecting and shifting device so that the exhausted air flow is a laminar flow and the air resistance is minimized through such a shape of the windpipe to improve the noise generated by the air vibration.
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