Air conditioner

Abstract

An air conditioner is provided, near the air discharge opening (5), with an air flow guide panel (20) and a speaker (21). The air flow guide panel (20) is operated to form a duct-like air discharge path (10) near the air outlet (5), and a sound wave for canceling operation noise including the air blowing noise of the fan (7) is emitted from the speaker (21) to the duct-like air discharge path (10).

Description

technical field [0001] The present invention relates to an air conditioner, and more specifically, to an air conditioner capable of reducing noise during operation such as blowing sound. Background technique [0002] In the past, in order to reduce the noise during the operation of the air conditioner, such as the blowing sound of the air conditioner, an air conditioner with an active noise control mechanism (also called active noise cancellation) has been proposed. to cancel out the noise. [0003] For example, in Patent Document 1, a microphone and a panel speaker are installed in a predetermined space of an indoor unit of an air conditioner, and noise of a specific frequency detected by the microphone is emitted from the panel speaker at substantially the same frequency and at substantially the same sound pressure level. , Sound waves with substantially opposite phases can effectively eliminate noise. [0004] In addition, the technology disclosed in Patent Document 2 i...

AI Technical Summary

Problems solved by technology

[0009] In active noise cancellation, since a sound wave (noise) traveling in a closed space such as a pipe that becomes a one-dimensional sound field (a sound field in which the propagation of sound is limited to one direction) approximates a plane wave, the sound wave emitted from the sound source for cancellation is used. The sound wave of the opposite phase can cancel the noise very well, and can effectively eliminate the noise, but in a three-dimensional sound field (a sound field that propagates sound in random directions) such as free space propagation, the sound wave becomes a spherical wave, and the noise is reversed due to the generation of noise. The area where the sound wave of the phase impacts back, and the area where the noise level rises between the same phases, so the existing technology cannot achieve practical application level noise elimination

[0010] With regard to the noise elimination of the air supply noise, since the air conditioning duct installation has a duct that can become a one-dimensional sound field as the air supply path, it can be relatively easy to use active noise cancellation, but the air conditioner that installs the indoor unit on the indoor wall surface In the machine, there is no air supply path called a one-dimensional sound field. Even if a canceling sound source is installed in the air supply path, as described above, it is the same as the case of implementing active noise cancellation in a three-dimensional sound field. On the contrary, it becomes a noisy place and cannot be practically applied at all.

As a matter of fact, various studies have been made on technologies for reducing running noise as in Patent Documents 1 to 3, but there are no practical examples.

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