A low flow resistance prerotation phase muffler and its design method

Abstract

The invention discloses a low-flow-resistance pre-rotation phase muffler, which comprises an outer cylinder and a porous plate arranged in the outer cylinder. The porous plate forms a plurality of flow channels in the outer cylinder, and the internal flow channels The space between the outer cylinder and the outer cylinder is filled with sound-absorbing materials; the inlet and outlet of the inner flow channel are misaligned; compared with the muffler with chaotic internal flow such as sheet type, honeycomb type, and labyrinth type, the present invention has low flow resistance The flow channel inside the pre-swirl phase muffler is smooth, the air flow is uniform and controllable, the turbulent vortex ability of the air flow is weak, and the flow efficiency is high. The pre-swirl air flow angle direction of the air flow matches the installation angle of the inlet blade in the impeller, which can improve the aerodynamic performance of fans and other equipment.

Description

technical field [0001] The invention belongs to the technical field of mufflers, and in particular relates to a low flow resistance pre-rotation phase muffler and a design method. Background technique [0002] Noise is an irregular combination of sound waves of various frequencies and intensities. Noise affects people's hearing, cardiovascular disease and nervous system function, and reducing noise pollution is of great significance to social and economic development. As an effective noise reduction device, the muffler is widely used in the control of intake and exhaust noise of fluid machinery, ventilation ducts, generators, etc. While the muffler is muffled, there is still gas circulation inside. The mufflers include resistive mufflers, resistive mufflers and impedance composite mufflers. The resistive muffler uses the sound absorption effect of sound-absorbing materials to reduce noise. It has a good muffler effect on noise in the middle and high frequency range. Mecha...

AI Technical Summary

Problems solved by technology

[0003] The current straight-pipe muffler is directly connected to the vertical noise source and the muffler inlet due to the direct connection of the pipe, so the noise reduction capacity is low. If a better noise reduction capacity is required, the muffler pipe is long, the space is large, and the cost is high. It is not allowed to use the site.

For sheet type, honeycomb type, labyrinth type mufflers that increase the muffler area and set multiple muffler chambers inside the muffler, although the muffler area has been improved, the flow area is reduced, the air velocity is high, and the flow field is chaotic. The regenerative noise is large, and the flow loss of the muffler is large

At the same time, if the muffler is used for rotating mechanical equipment such as fans, the outlet of the muffler is the inlet end of the fan, and the airflow velocity distribution at this position will affect the inlet airflow angle of the fan, seriously affecting the performance of the equipment

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