Variable-frequency microperforated pipe silencer with variable perforation section lengths

A technology of micro-perforation and muffler, which is applied in the direction of pipe elements, pipes/pipe joints/pipes, mechanical equipment, etc., can solve the problem of single muffler frequency band, etc. Effect

Inactive Publication Date: 2014-01-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a frequency-adjustable micro-perforated pipe muffler

Method used

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  • Variable-frequency microperforated pipe silencer with variable perforation section lengths
  • Variable-frequency microperforated pipe silencer with variable perforation section lengths

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[0021] Example

[0022] An adjustable frequency micro-perforated tube muffler with variable perforated section length, such as figure 1 As shown, the main pipe 1 is included. The inside of the main pipe 1 is a fluid channel for connecting noise sources. In practical applications, one end of the main pipe 1 is connected to an exhaust pipe or an intake pipe of a rotating machine such as an engine, a motor, or a fan. The muffler also includes a sleeve piston 9, an outer pipe 3 and a sleeve position adjustment device. The middle section of the main pipe 1 is a perforated tube 2 with micro-perforations. The diameter of the micro-perforations on the perforated tube 2 is 0.1-2mm. The perforation rate of the micro-perforation on the perforated tube 2 is 1 to 5%. The wall thickness is 0.5-2mm. The sleeve piston 9 is tightly sleeved on the outside of the main pipe 1, and the head of the sleeve piston 9 is provided with a disc 4, and the tail of the sleeve piston 9 is connected with the sl...

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Abstract

The invention relates to a variable-frequency microperforated pipe silencer with variable perforation section lengths. The silencer comprises a main pipeline, a sleeve piston, an outer pipeline and a sleeve position adjusting device. The middle section of the main pipeline is a perforated pipe provided with microperforated-holes, the sleeve piston is arranged outside the main pipe in a closely-attached and sleeved mode, a disk is arranged on the head portion of the sleeve piston, the tail portion of the sleeve piston is connected with the sleeve position adjusting device, one end of the outer pipeline is connected to the main pipeline in a sealing mode, the other end of the outer pipeline is connected to the outer side of the sleeve piston through an end cap and enables the disk of the sleeve piston to be connected with the inner wall of the outer pipeline in an attached mode, an expansion cavity is formed by enclosure of the outer pipeline, and the main pipeline and the disk. The expansion cavity is communicated with a fluid channel of the main pipeline through the microperforated-holes, and therefore the effect of silencing can be achieved; the sleeve position adjusting device drives the sleeve piston to axially slide on the main pipeline to adjust effective lengths of the expansion cavity and a microperforated pipe, and therefore silencing frequency of the silencer can be adjusted. Compared with the prior art, the variable-frequency microperforated pipe silencer has the advantages of being simple in structure, adjustable in silencing frequency, and the like.

Description

technical field [0001] The invention relates to a muffler, in particular to a frequency-adjustable micro-perforated pipe muffler with a variable perforation section length, which belongs to the technical field of noise reduction and environmental protection. Background technique [0002] The sound-absorbing structure of micro-perforated panels has developed rapidly since it was proposed by Academician Ma Dayou in the 1970s. It does not require porous sound-absorbing materials, and can obtain good sound-absorbing effect over a wide frequency band only by using a micro-perforated plate structure. Later, it was extended to the engineering application of the micro-perforated pipe muffler. The micro-perforated sound-absorbing structure has the advantages of high temperature resistance and corrosion resistance, and can be used in harsh environments with high-speed airflow and humidity. Moreover, the utility model has the advantages of simple structure, convenient and reliable pr...

Claims

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Application Information

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IPC IPC(8): F16L55/033
CPCF16L55/033F16L55/02781
Inventor 左曙光相龙洋龙国张孟浩胡佳杰韦开君
Owner TONGJI UNIV
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