Air pump with noise reduction partitions in the housing

Details Air pump with noise reduction partitions in the housing Air pump with noise reduction partitions in the housing

1997-11-24

1999-12-28

Freay, Charles G.

Pumps

With muffler acting on pump fluid

4174131, F04B 4300

Patent

active

060073071

ABSTRACT:
An air pump comprises a diaphragm pump with a diaphragm connected to a vibrator driven by an electromagnet. The air pump has a main casing body divided into three chambers: an air pump chamber which houses the electromagnet, vibrator and diaphragm pump; a sucked air noise reduction chamber into which air is sucked from outside the casing as the volume of the diaphragm chamber of the diaphragm pump is expanded; and a discharged air noise reduction chamber through which air is discharged to the exterior of the casing as the volume of the diaphragm chamber is decreased. A first air passage connects the sucked air noise reduction chamber to an inlet opening of the diaphragm chamber and a second air passage connects an outlet opening of the diaphragm chamber to the discharged air noise reduction chamber. A portion of the noise resulting from operation of the diaphragm and the inlet and outlet valves to the diaphragm chamber is propagated from the diaphragm chamber through air in the first and second air passages and is reduced as the sound waves expand upon entering the noise reduction chambers. In a second embodiment the main casing body is divided into only two chambers and the electromagnet, vibrator and diaphragm pump are disposed in one or the other of these chambers.

REFERENCES:
patent: 3825374 (1974-07-01), Kondo
patent: 3830596 (1974-08-01), Kondo
patent: 5009579 (1991-04-01), Grant
patent: 5137432 (1992-08-01), Tsai
patent: 5360323 (1994-11-01), Hsieh
patent: 5711656 (1998-01-01), Tsai

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