Air conduit device with active noise reduction function and noise reduction method

Abstract

An air conduit device with an active noise reduction function comprises a noise space side air conduit and a noise reduction space side air conduit, wherein the noise space side air conduit and the noise reduction space side air conduit communicate with each other; the noise reduction space side air conduit is a double-layered conduit which includes an inner-layer conduit and an outer-layer conduit respectively; the outer-layer conduit sleeves the inner-layer conduit; a ventilating interlayer is formed between the inner-layer conduit and the outer-layer conduit; at least one noise sensor is mounted on the edge of the noise space side air conduit or in the noise space side air conduit; an electrodynamic loudspeaker is mounted in the inner-layer conduit; the noise sensor and the electrodynamic loudspeaker are connected with a noise reduction control circuit respectively; and the noise reduction control circuit receives noise signals from the noise sensor and drives the electrodynamic loudspeaker. Since the sound wave plane of a secondary sound source is parallel to that of noise, the air conduit device can obtain a favorable wideband noise suppression effect; and an air circulating port is formed near a noise canceling section, so that the air conduit device can achieve an obvious noise suppression effect while guaranteeing the ventilation quantity.

Description

technical field [0001] The invention discloses a ventilation duct device, in particular a ventilation duct device with active noise reduction and a noise reduction method, belonging to the technical field of acoustics. Background technique [0002] Ventilation ducts are commonly used ventilation devices in modern buildings. In order to allow the interior of the building to obtain fresh air, the opening at one end of the ventilation duct usually needs to be opened in the noise space outside the building. How to effectively reduce or eliminate the noise that enters the building from the noise space along the ventilation duct while ensuring sufficient ventilation has become an urgent problem to be solved. [0003] In the prior art, noise reduction technologies applicable to ventilation ducts are mainly divided into passive noise reduction and active noise reduction technologies. The main method of passive noise reduction technology is to design the ventilation duct as a compl...

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Problems solved by technology

[0007] Aiming at the disadvantages of poor active noise reduction effect in the prior art mentioned above, the present invention provides a ventilation duct device with active noise reduction and a noise reduction method, which can operate at 100Hz to 8~15dB noise attenuation can be obtained in a wide range of 8000Hz

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