Title:
【発明の名称】インライン型ノイズ低減方法及び装置
Document Type and Number:
Japanese Patent JP2824699
Kind Code:
B2
Abstract:
The device has an entrance and an exit with two low-restriction venturi sections placed in parallel between the entrance and exit. The entering gas flow is separated into two parts, one to pass through one venturi section and the other to pass through the other venturi section. The two parts reunite as they leave the exit. The venturi sections are substantially identical and each contains at least one venturi. The two sections are axially offset from each other by a distance that is equal to one-quarter of the wavelength of the frequency of a principal noise component so that that particular noise frequency is phase shifted 180 degrees by one venturi section relative to the other with resulting cancellation and significant noise attenuation. Usage in an air induction system of an internal combustion engine for attenuating noise from the engine is illustrated. The device is capable of functioning irrespective of the direction of noise in relation to the direction of gas flow.
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Inventors:
Lee, Carlos
Application Number:
JP50062590A
Publication Date:
November 11, 1998
Filing Date:
November 09, 1990
Export Citation:
Assignee:
Siemens Aktiengesellschaft
International Classes:
F01N1/06; F02M35/12; (IPC1-7): F02M35/12; F01N1/06
Domestic Patent References:
| JP57143119A | ||||
| JP60128921U | ||||
| JP349364U | ||||
| JP2149813U |
Attorney, Agent or Firm:
Takashi Honda