High-efficiency sound-absorbing silencer

Abstract

A high-efficiency sound-absorbing silencer is specifically designed for noise reduction in factory equipment. This invention mainly comprises a housing, a first fan assembly, a first lower flow guide structure, and a first upper flow guide structure. The housing forms an internal chamber with a sound wave inlet and outlet at the front and rear ends, respectively. Multiple guide holes are provided on the inner wall, and sound-absorbing material is placed within the chamber. The first fan assembly is located adjacent to the sound wave inlet within the chamber, generating directional airflow to guide noise waves axially into the chamber. Each flow guide structure has a bottom arc angle greater than 180 degrees, is positioned along the inner wall of the housing, has a concave wave-facing surface facing the sound wave inlet, and has guide holes on its surface and sound-absorbing material inside. The upper and lower flow guide structures are arranged front to back and located on opposite sides of the chamber's centerline. Noise waves interfere with the flow through the flow guide structures and gradually attenuate in energy upon contact with the sound-absorbing material through the guide holes. This improves upon the poor broadband noise reduction effect and lack of airflow interference efficiency of traditional silencers. The overall structure is streamlined, with stable noise reduction performance, making it highly suitable for high-flow-rate noise environments in industrial equipment.

Claims

1. A high-efficiency silencer for guiding and absorbing sound waves, comprising: A housing having a chamber, with a sound wave inlet at the front end and a sound wave outlet at the rear end of the housing, and a plurality of guide holes and a sound-absorbing material respectively provided on one inner wall and inside the housing; a first fan device disposed in the chamber and adjacent to the sound wave inlet, for generating directional airflow to guide a noise sound wave into the chamber and transmit it axially; a first lower guide structure with an arc-shaped bottom disposed along the inner wall of the housing, and the arc-shaped bottom angle being greater than 180 degrees, one wave-facing curved surface of the first lower guide structure being concave and facing the sound wave inlet, and having the guide holes on its surface, and accommodating the sound-absorbing material inside, the first lower guide structure being located axially rear of the first fan device; and a first upper guide structure with an arc-shaped bottom disposed along the inner wall of the housing, and the arc-shaped bottom angle being greater than 180 degrees. The first upper guide structure has a concave wave-facing surface that faces the sound wave inlet and has guide holes on its surface. The sound-absorbing material is housed inside the concave surface. The first upper guide structure is located axially behind the first lower guide structure and is on the opposite side of the center line of the chamber. The noise sound wave is guided by the first lower guide structure and the first upper guide structure, and passes through the guide holes to contact the sound-absorbing material, thereby gradually weakening the noise energy.

2. The high-efficiency sound-absorbing silencer as described in claim 1, wherein the top of the first lower flow-guiding structure extends beyond the centerline of the housing.

3. The high-efficiency sound-absorbing silencer as described in claim 1, wherein the top of the first upper flow-guiding structure extends beyond the centerline of the housing.

4. The high-efficiency sound-absorbing silencer as described in claim 1 further includes: A second fan device, disposed within the cavity and axially rear of the first upper airflow guide structure, is used to generate directional airflow to continuously guide the noise sound wave to the rear end of the cavity; a second lower airflow guide structure, with an arc-shaped bottom disposed along the inner wall of the housing, and the arc-shaped bottom angle being greater than 180 degrees, the wave-facing surface of the second lower airflow guide structure being concave and facing the sound wave inlet, and having guide holes on its surface, with the sound-absorbing material housed inside, wherein the second lower airflow guide structure is located axially rear of the second fan device; and a second upper airflow guide structure, with an arc-shaped bottom disposed along the inner wall of the housing, and the arc-shaped bottom angle being greater than 180 degrees. The second upper guide structure has a concave wave-facing surface facing the sound wave inlet, and its surface is provided with guide holes. The sound-absorbing material is housed inside. The second upper guide structure is located axially behind the second lower guide structure and is located on the opposite side of the second lower guide structure relative to the center line of the chamber. The noise sound wave is further guided by the second lower guide structure and the second upper guide structure, and passes through the guide holes to contact the sound-absorbing material to continuously weaken the noise energy.

5. The high-efficiency sound-absorbing silencer as described in claim 4, wherein the top of the second lower flow-guiding structure extends beyond the centerline of the housing.

6. The high-efficiency sound-absorbing silencer as described in claim 4, wherein the top of the second upper flow-guiding structure extends beyond the centerline of the housing.

7. A silencer for high-efficiency sound-absorbing wave conduction as described in claim 1 or 4, wherein the sound-absorbing material is at least one of foam, glass fiber, ceramic wool, sound-absorbing felt, silicon mixture and rock wool.

8. The high-efficiency sound-absorbing silencer as described in claim 1, wherein the first lower flow-guiding structure and the first upper flow-guiding structure are symmetrically arranged with respect to the centerline of the chamber.

9. The high-efficiency sound-absorbing silencer as described in claim 4, wherein the second lower flow-guiding structure and the second upper flow-guiding structure are symmetrically arranged with respect to the centerline of the chamber.

10. The high-efficiency sound wave guide silencer as described in claim 4, wherein the first lower guide structure, the first upper guide structure, the second lower guide structure, and the second upper guide structure are staggered along the axial direction of the chamber to form a continuous sound wave guide path.

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