Hollow plastic product having a sound attenuator
AssigneeExcell Corporation
InventorTatsuya Nakagawa
Life of this patent
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Abstract
A hollow plastic product having a sound/noise attenuating function is provided. The product includes a duct (1) defining a flow passage and extending over a length along a longitudinal axis, a resonator (1b) having an internal chamber (1b') and a connector (1c) which establishes a fluidic communication between the flow passage of duct (1) and the internal chamber (1b') of resonator (1b). The resonator (1b) serves to absorb or attenuate sound/noise created by the fluid flowing through the flow passage. The product is manufactured from the same parison at the same time and thus has a unitary structure. An improved method for manufacturing such a hollow plastic product is also provided.
Claims4
A hollow plastic product having a sound attenuating function, comprising:
- a duct extending over a length along a longitudinal axis to define a flow passage, said duct being comprised of a first plastic material and said duct is provided with at least one end fitting portion at one end thereof, said end fitting portion being comprised of a second plastic material which is softer than said first plastic material;
- a resonator defining a chamber having a predetermined volume and comprised of said first plastic material, said resonator being located at a radial distance from said longitudinal axis;
- a connector extending between said duct and said resonator to thereby establish a fluidic communication between said chamber of said resonator with the flow passage of said duct, said connector being comprised of said first plastic material;
- and
- wherein said duct, resonator and connector define a unitary structure and said predetermined volume serves to attenuate a sound created by fluid flowing through said flow passage.
A hollow plastic product having a sound attenuating function, comprising:
- a duct extending over a length along a longitudinal axis to define a flow passage, said duct being comprised of a first plastic material and said duct comprising;
- at least one intermediate bellows portion at an intermediate portion of said duct, said intermediate bellows portion being comprised of a second plastic material which is softer than said first plastic material;
- a resonator defining a chamber having a predetermined volume and comprised of said first plastic material, said resonator being located at a radial distance from said longitudinal axis;
- a connector extending between said duct and said resonator to thereby establish a fluidic communication between said chamber of said resonator with the flow passage of said duct, said connector being comprised of said first plastic material;
- and
- wherein said duct, resonator and connector define a unitary structure and said predetermined volume serves to attenuate a sound created by fluid flowing through said flow passage.
Dependencies are inferred from the claim text.