Patent ID: 7896129
Filing Date: 2011-03-01
Classification: C03C,F01N

Abstract:
1. A sub-muffler comprising: a perforated exhaust pipe arranged inside the sub-muffler; caps arranged outside the perforated exhaust pipe; an out pipe arranged outside the perforated exhaust pipe; and a sound absorbing material filled in a space between the perforated exhaust pipe, and the caps and the out pipe, wherein at least part of the sound absorbing material, which is closer to the perforated pipe, is a basalt fiber for high temperature, the sound absorbing material filled in the space between the perforated exhaust pipe, and the caps and the out pipe has a two-layer structure; and the sound absorbing material layer closer to the caps and the out pipe is a layer of a basalt fiber for low temperature, the basalt fiber for high temperature is composed of SiO 2 : 55.9-61.1, FeO+Fe 2 O 3 : 8.10-9.39, Al 2 O 3 : 16.2-18.6, CaO: 5.64-6.54, Na 2 O: 2.94-3.17, K 2 O: 1.92-2.05, MgO: 0.31-2.57, TiO 2 : 0.81-0.92, MnO: 0.15-0.22, P 2 O 5 : 0.20-0.23, ZrO 2 : 0.03-0.03, BaO: 0.05-0.05, SrO: 0.03-0.04, B 2 O 3 : 0.11-0.22, Cr 2 O 3 : 0.01-0.03 and SO: 0.01-0.2 wt %, and the basalt fiber for low temperature is composed of SiO 2 : 54.1-58.1, FeO+Fe 2 O 3 : 8.23-9.53, Al 2 O 3 : 15.0-18.0, CaO: 7.68-8.68, Na 2 O: 2.35-2.75, K 2 O: 1.54-1.69, MgO: 1.55-4.75, TiO 2 : 0.89-1.04, MnO: 0.15-0.22, P 2 O 5 : 0.14-0.22, ZrO 2 : 0.03-0.03, BaO: 0.03-0.05, SrO: 0.03-0.05, B 2 O 3 : 0.05-0.15, Cr 2 O 3 : 0.01-0.03 and SO: 0.01-0.2 wt %.