Muffling structure of vent pipe and muffling structure of case
AssigneeTokyo Roki Co., Ltd.
InventorsKosaku Ishida, Yoshitaka Watanabe, Kazutaka Hara
Life of this patent
Estimating the term…
Abstract
The present invention aims to provide a muffling structure of a vent pipe and a muffling structure of a case, which is capable of muffling in a wide frequency range and preventing vent resistance in the air pipe or the case from deterioration. Vent holes (11a) are formed in the peripheral wall of the vent pipe (11), a cover (12) is so provided on the peripheral wall of the vent pipe (11) as to cover the vent holes (!1a), and a bag-like body (13) in which activated charcoal (14) is contained is disposed in the space formed by the peripheral wall of the vent pipe (11) and the inner wall of the cover (12).
Claims4
A muffling structure of a vent pipe, characterized in that the vent pipe is a primary duct one end of which is connected with an air cleaner, the primary duct having a node position of primary resonance in the primary duct, wherein the node position is a central position of the primary duct, and the muffling structure comprises:
- vent holes formed in a peripheral wall of the primary duct proximate the node position of primary resonance;
- a cover so provided outside the peripheral wall as to cover the vent holes;
- activated charcoal filled in the cover;
- a ventilative member interposed between the activated charcoal and the peripheral wall;
- and
- any of a plate spring, springs, a foam member such as sponge, and a cushion member provided in a ceiling part inside the cover.
A muffling structure of a case provided with a vent pipe for introduction purposes and a vent pipe for discharge purposes, the muffling structure comprising:
- an inner pipe that is disposed in the case and communicates with the introduction vent pipe or the discharge vent pipe the inner pipe having a node position of primary resonance in a central portion of the inner pipe;
- vent holes formed in a peripheral wall of the inner pipe proximate the node position of primary resonance;
- a cover so provided outside the peripheral wall as to cover the vent holes;
- activated charcoal filled in the cover;
- a ventilative member interposed between the activated charcoal and the peripheral wall;
- and
- any of a plate spring, springs, a foam member such as sponge, and a cushion member provided in a ceiling part inside the cover.
Dependencies are inferred from the claim text.