Pipes and tubular conduits – Plural duct – Coaxial
Reexamination Certificate
1999-10-22
2001-05-22
Hook, James (Department: 3752)
Pipes and tubular conduits
Plural duct
Coaxial
C138S125000, C138S148000
Reexamination Certificate
active
06234211
ABSTRACT:
The present invention relates to pipes for the ducting of gaseous fluids, and it particularly but not exclusively applies to such a pipe which is used to transport air within cars, especially in engines.
The invention especially applies to a pipe which is used in a car engine and is sited after the air filter to duct the air for combustion towards the engine block. In this particular application it is known that air intended for combustion and delivered to the engine must be clean and this is made possible by the air filter. It is therefore necessary that this pipe, in its entirety, cannot pneumatically communicate with the outside as such a gaseous exchange between the outside and the inside would spoil the clean air ducted by the pipe.
It is also known that the car industry is particularly mindful of noise reduction.
The aim of the invention is therefore to supply a pipe of the type described above which, whilst preventing a gaseous exchange between the outside and the inside, reduces noise emissions.
To this end, the pipe according to the invention is characterised in that it includes a porous interior tube which is permeable to gaseous fluids and which reduces noise transmission, and an essentially rigid exterior tube, which forms an envelope that is distant from the interior tube in a material essentially non-permeable to gaseous fluids.
According to the present invention, the pipe is therefore used as both a pipe for the ducting of gaseous fluids without a gaseous exchange with the outside, and a noise silencer.
Contrary to traditional silencers, which include an interior tube either interrupted or including openings, and an exterior tube functioning with entering in resonance, the pipe according to the invention, in its silencing action, functions without entering in resonance as the interior tube has a porous surface. The gaseous fluid can only move from the inside to the outside of the porous tube and reciprocally, with passing through its porous surface. With the porosity of the interior tube being achieved through very small openings, the viscosity of the gaseous fluid becomes preponderant, which in turn results in an energy loss by friction as the gaseous fluid passes through and stops the on-set of resonance, as this energy outlay reduces all movements of the fluid.
The interior tube is advantageously fibrous, for instance based on polyester fibres, whereas the exterior tube, which is essentially rigid, in for example made of plastic, notably of polypropylene.
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Hook James
Renner Kenner Greive Bobak Taylor & Weber
Westaflex Automobile
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