Linear pump with sound attenuator
First Claim
1. A linear pump, comprising an electro-magnetically driven piston reciprocating within a cylinder in communication with a multi-cavity air intake, the intake including a first cavity and a second cavity, the first cavity being in communication with ambient air and being in communication with the second cavity through a first orifice and the second cavity being in communication with a downstream section of the pump through a second orifice, wherein intake air re-expands in the second cavity before passing through the second orifice.
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Accused Products
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.
14 Citations
22 Claims
- 1. A linear pump, comprising an electro-magnetically driven piston reciprocating within a cylinder in communication with a multi-cavity air intake, the intake including a first cavity and a second cavity, the first cavity being in communication with ambient air and being in communication with the second cavity through a first orifice and the second cavity being in communication with a downstream section of the pump through a second orifice, wherein intake air re-expands in the second cavity before passing through the second orifice.
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17. A linear pump having a pump housing containing an electro-magnetically driven piston reciprocating within a cylinder in communication with a multi-cavity air intake, the intake including:
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a cover mounted to the pump housing to define an intake air passage;
an inner cavity defined in part by the pump housing having an inner orifice in communication with an intake chamber of the pump; and
an outer cavity defined between the cover and a partition mounted to the pump housing to seal off the inner cavity, the outer cavity being in communication with ambient air through the intake air passage and in communication with the inner cavity through an outer orifice in the partition which allows intake air to re-expand in the inner cavity before passing through the inner orifice. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification