| 摘要 |
<p>PURPOSE:To reduce the component of a low frequency and minimize the noise during combustion without enlarging the equipment size and increasing the pressure loss by installing a sound absorbing section having a plurality of pipelines whose opening length varies within an apparatus main body designed to supply fuel with one end closed and the other end opened. CONSTITUTION:A plurality of pipelines 28 whose length varies are installed between an outside case 24 and an apparatus main body 14 based on a pipe length l where a frequency corresponds with a resonance component of Helmholtz f0 produced in the apparatus main body by combustion in such a manner that one end may be closed while the other end may be opened to a waste duct 21. The installation of a sound absorbing section 29 which comprises a plurality of pipelines whose length varies to meet the resonance component and opened inside the apparatus main body 14 allows the resonance component to be absorbed into the aforesaid pipelines inside the apparatus main body 14, thereby providing the effect of sound reduction in a low frequency band.</p> |
