Silencer and automobile

Abstract

The invention discloses a silencer. The silencer comprises a cylinder body, silencer cotton and silencer tubes, wherein two ends of the cylinder body are both provided with silencer end covers, and the two silencer end covers are respectively provided with an air inlet and an air outlet; the silencer cotton is arranged in the cylinder body; the silencer tubes are embedded in the silencer cotton; each silencer tube comprises a first straight cylinder section, a funnel section and a second straight cylinder section which are communicated in sequence, and the diameter of each second straight cylinder section is less than that of the corresponding first straight cylinder section; the diameters of each funnel section are gradually reduced from the corresponding first straight cylinder section to the corresponding second straight cylinder section; the number of the silencer tubes is two, the second straight cylinder sections of the two silencer tubes are communicated with each other to forma silencer passage; the first straight cylinder section of one of the silencer tubes is inserted into the air inlet, and the first straight cylinder section of the other one of the silencer tubes is inserted into the air outlet. The silencer has the advantages that the bore diameters of the silencer passage are firstly reduced and then increased, so that air flow is firstly compressed and then expanded after entering into the silencer passage, the expansion ratio is larger and the silencing ability for low-frequency noise is high. The invention further discloses an automobile using the above silencer, and the automobile has the effect of small low-frequency noise.

Description

technical field [0001] The invention relates to the technical field of machinery industry, more specifically, to a muffler, and also to an automobile using the muffler. Background technique [0002] The muffler of a car is a special device that prevents sound transmission and allows airflow to prevent airflow dynamic noise. [0003] see figure 1 , the existing automobile muffler includes a barrel body and a sound-absorbing fiber 12 arranged on the inner wall of the barrel body, one side of the barrel body is provided with an air inlet, the other side is provided with an air outlet, and the barrel body is provided with two Baffle 11. Due to the influence of the exhaust pipe layout of the whole vehicle, the inlet and outlet of the muffler have little difference in diameter from the diameter of the barrel body, resulting in insufficient expansion ratio, and the muffler effect of low-frequency noise is not obvious. [0004] In addition, the double baffle design of the above-m...

AI Technical Summary

Problems solved by technology

The air inlet and outlet of the muffler are affected by the layout of the exhaust pipe of the whole vehicle, and the diameter is not much different from the diameter of the barrel body, resulting in insufficient expansion ratio and low-frequency noise muffler effect is not obvious

[0004] In addition, the double baffle design of the above-mentioned automobile muffler also affects the volume of the inner cavity of the muffler to a certain extent, resulting in insufficient muffler volume

[0005] Furthermore, the above-mentioned sound-absorbing fiber adopts a filamentous structure, which is prone to the problem of fiber hardening under the combined action of urea and water vapor, and the aging speed is too fast, resulting in a significant deterioration of the sound-absorbing ability of medium and high-frequency noise, and insufficient durability

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