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Composite silencer for wall surface exhaust fan

A technology of muffler and exhaust fan, applied in the direction of machine/engine, non-variable-capacity pump, pump element, etc., can solve the problems of large pressure loss and emission impact, and achieve small flow resistance, large effective ventilation, and noise reduction frequency. wide effect

Pending Publication Date: 2019-06-25
XIAMEN JIADA GREEN CONSTRUCION ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The total pressure of the exhaust fan is generally about 100Pa ~ 200Pa, which is more sensitive to the wind pressure loss of the muffler.
Therefore, the pressure loss of the muffler using the existing exhaust duct is large, which will result in the emission being affected

Method used

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  • Composite silencer for wall surface exhaust fan
  • Composite silencer for wall surface exhaust fan
  • Composite silencer for wall surface exhaust fan

Examples

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Embodiment Construction

[0029] exist figure 1 , 2 . In the embodiment shown in 3, a wall exhaust fan composite muffler includes a muffler elbow 1, a low-frequency chip muffler 2, an installation bearing frame 3, and a protective net 31. The muffler elbow 1 is installed on the wall in 41 rows Outside the tuyere 42, the low-frequency chip muffler 2 is vertically installed under the muffler elbow 1. The low-frequency chip muffler 2 includes a common-plate flange straight pipe 21 and a muffler insert 22. The muffler insert 22 is made of an ultra-fine glass wool board 23 with a volume density of 60-100kg / m³, and is covered with a weather-resistant film with a thickness of 0.02mm. The panel is a metal perforated plate with a hole diameter of 6 mm and a perforation rate of 20%. The top of the disappearing insert is provided with a circular arc 24. The thickness of the sound-absorbing insert 22 is 50-70mm. The distance 25 between the sound-absorbing inserts 22 is the sound-absorbing insert Twice the thickn...

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Abstract

The invention discloses a wall surface exhaust fan composite silencer. The wall surface exhaust fan composite silencer comprises a noise elimination elbow, a low-frequency sheet type silencer, a mounting heavy frame and the protection net, the noise elimination elbow are installed outside the wall surface exhaust port, and the low-frequency sheet type silencer is vertically arranged under the noise elimination elbow. The low-frequency sheet type silencer comprises a common-plate flange straight pipe and a silencing inserting sheet, wherein the silencing inserting sheet is composed of a superfine glass wool board with the volume weight of 60-100 kg / m<3> and a weather-resistant thin film with the thickness of 0.02mm, the protective panel is a metal perforated plate with the hole diameter of6 mm and the penetrating rate of 25%, the thickness of the silencing inserting sheet ranges from 50 mm to 70 mm, the top of the silencing inserting sheet is arc-shaped, the sheet spacing of the silencing inserting sheet is twice the thickness of the silencing inserting sheet, the distance between the silencing inserting sheet and the straight pipe wall of the common plate flange is one half of thedistance between the sheet spacing of the silencing inserting sheet, and the overall noise elimination amount of the silencer can be improved on the premise that the medium and low frequency noise attenuation amount is improved. According to the invention, the composite silencer has the advantages of being small in flow resistance, large in noise elimination amount, wide in noise elimination section and simple and convenient in installation technology.

Description

technical field [0001] The invention relates to a muffler, in particular to a composite muffler arranged on a wall exhaust fan. Background technique [0002] The exhaust fan is a type of air-conditioning appliance that is driven by a motor to rotate the blades to drive the airflow to exchange indoor and outdoor air. Also known as ventilation fan, ventilation fan, etc. The purpose of exhaust is to remove indoor dirty air, adjust temperature, humidity and sensory effects. Exhaust fans are widely used in homes, public places and industrial plants. [0003] Exhaust fan noise is a wide-band noise dominated by low- and medium-frequency noise. The low- and medium-frequency noise is different from high-frequency noise. It can drop 6dB(A) at a distance of one meter. However, the low- and medium-frequency noise decreases very slowly, and the sound waves are longer, which can easily pass through obstacles, run long distances and penetrate walls and walls directly into the human ear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/66
Inventor 林洁林嘉祥
Owner XIAMEN JIADA GREEN CONSTRUCION ENG CO LTD
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