Ventilation component

Patent metadata

Field	Value
Publication number	US-11835019-B2
Application number	US-202117788201-A
Country	US
Kind code	B2
Filing date	May 12, 2021
Priority date	Jun 1, 2020
Publication date	Dec 5, 2023
Grant date	Dec 5, 2023

Abstract

A ventilation component includes a circumferential wall. At least a part of the circumferential wall is formed by the wall portion, which includes the inner layer and the outer layer. The inner layer contains fibers and has permeability, and the outer layer is provided on the radially outer side of the inner layer and has elasticity. The wall portion forms a vibration system including the inner layer as a mass portion and the outer layer as a spring portion. The vibration system has a partially varying natural frequency.

First claim

The invention claimed is:

1. A ventilation component, comprising a circumferential wall, wherein
an outer circumferential surface of the circumferential wall forms an outer circumferential surface of the ventilation component,
the circumferential wall is entirely formed by a wall portion, the wall portion being made of nonwoven fabric that has been subjected to thermal compression molding,
the wall portion includes:
an inner layer that has air permeability; and
an outer layer that is provided on a radially outer side of the inner layer and has elasticity, and

the wall portion forms a vibration system including the inner layer as a mass portion and the outer layer as a spring portion, the vibration system having a partially varying natural frequency.

2. A ventilation component, comprising a circumferential wall, wherein
an outer circumferential surface of the circumferential wall forms an outer circumferential surface of the ventilation component,
the circumferential wall is entirely formed by a wall portion, the wall portion being made of nonwoven fabric that has been subjected to thermal compression molding,
the wall portion includes:
an inner layer that has air permeability; and
an outer layer that is provided on a radially outer side of the inner layer and has elasticity,

the wall portion forms a vibration system including the inner layer as a mass portion and the outer layer as a spring portion, the vibration system having a partially varying natural frequency, and
the outer layer has air permeability and a partially varying thickness.

3. The ventilation component according to claim 2 , wherein the inner layer has a higher density than the outer layer.

4. The ventilation component according to claim 2 , wherein
the outer layer includes an air permeable portion, which has air permeability, and a non-permeable portion, which does not have air permeability, and
the air permeable portion is arranged at a position corresponding to an antinode of a standing wave of a sound wave of air flowing through a space on an inner side of the circumferential wall.

Assignees

• Toyota Boshoku Kk

Inventors

• Kimura Ryusuke

Classifications

• F02M35/12 Primary

  Intake silencers {; Sound modulation, transmission or amplification (intake silencers also used as exhaust silencer F01N13/007; filters for compressors F04B39/16)} · CPC title

• G10K11/172

  using resonance effects · CPC title

• G10K11/161

  in systems with fluid flow (G10K11/162 takes precedence; gas flow silencers or exhaust apparatus for machines or engines in general or for internal combustion engine F01N, noise absorbers in pipes or pipe systems F16L55/02; noise absorption in air conditioning and ventilation F24F13/24; silencing exhaust or propulsion jets in aircraft B64D33/06) · CPC title