Muffling mechanism for engine driven air conditioner

Abstract

Abstract PURPOSE:To reduce an engine noise sharply by setting up each draft tube between two engines and the atmospheric air after being branched off from a common draft tube source, and selecting each length of respective draft tubes so as to cause the pulsation of gas being produced in these draft tubes to become such a phase relationship as being offset with each other. CONSTITUTION:A pressure differential in front and in the rear of an intake valve of and engine and pressure fluctuations according to the opening are produced by drive of both first and second engines 1a, 1b, whereby intake pulsa tion conformed to this engine drive is produced each in both first and second intake pipes 6-1, 6-2, and thereby respective intake noises are brought forth. Since each intake pulsation in both these intake pipes 6-1, 6-2 is selected to length so as to cause each length, l1, l2, of the intake pipes 6-1, 6-2 to offset these pulsations, namely, each wavelength of these pulsations is set to lambda, or l1=2/3lambda, l2=lambda, it is offset in an ideal state, thus intake noises in these engines 1a, 1b will not occur at all.

Inventors

• 👤 Yoshihisa Kato
• 👤 嘉久 加藤
• 👤 Eiji Morita
• 👤 栄治 森田
• 👤 Michinao Takahashi
• 👤 道尚 高橋

Bibliographic Details