Linear pump with sound attenuator
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United States of America Patent
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Issued Date -
Feb 16, 2006
app pub date -
Aug 13, 2004
filing date -
Aug 13, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A linear piston pump has a multi-cavity air intake providing improved sound attenuation characteristics. The air intake is formed between a cover mounted in spaced relation to a pump housing so as to define an air intake passage leading around the periphery of the cover to an outer cavity separated from an inner cavity by a partition. Flow orifices are formed in the partition as well as in the inner cavity for air to flow to the intake chamber. Intake air re-expands in the inner cavity to dissipate pulsations in the air flow from the rapidly action of the intake valve, and thereby reduces intake noise. A filter and air baffle filter retainer may also be included to further reduce intake noise.
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