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US 4,921,408 AGranted
Non-icing quiet air-operated pump
AssigneeGraco Inc.
InventorsDaniel J. Kvinge, Frederick A. Powers, Kenneth E. Lehrke
Life of this patent
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Abstract
A silencing system is provided for an air-operated pump which also eliminates icing of the pump at higher cycle rates and humidities. The exhaust from the air motor powers an air flow inducer to induce a flow of relatively warm ambient air. The induced flow of ambient air is drawn across cold components of the air motor, and the mixed (ambient and exhaust air) exit stream routed away from the air motor. The relatively warm mixed air exhaust flow also allows noise reduction by conventional acoustical techniques without suffering performance degradation due to icing.
Claims9
An air motor comprising:
- a valve controlling the flow of air in and out of said air motor;
- an exhaust passage connected to said valve;
- and
- areas cooled by cold exhaust air,
- the improvement comprising means for inducing the flow of ambient atmospheric air over said cold areas, said flow inducing means being operated by exhaust flow through said exhaust passage and mixing said ambient atmospheric air with said exhaust flow to provide an above freezing mixture.
2 more elements
Dependencies are inferred from the claim text.