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Operational noise control method for air conditioner

An air conditioner and noise control technology, applied in the direction of noise suppression, active noise control, air conditioning system, etc., can solve the problems of reducing operation sound, loud noise, no air supply path, etc., and achieve the effect of eliminating noise.

Inactive Publication Date: 2014-12-17
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Here, since a sound wave (noise) advancing 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) is close to a plane wave, the active noise cancellation uses The sound wave of the opposite phase can cancel the noise well, thereby effectively eliminating the noise, but in the three-dimensional sound field (the sound field in which the sound propagates in random directions) propagating in free space, since the sound wave is a spherical wave, noise is generated The area that is impacted back by the sound wave of the opposite phase, and the area where the noise level increases due to the same phase, so the existing technology cannot achieve the practical level of noise cancellation
[0010] With regard to the noise elimination of the air supply noise, although in the air-conditioning duct installation, since the air supply path has a duct that can become a one-dimensional sound field, it is relatively easy to apply active noise cancellation, but for the indoor unit installed on the indoor wall Air conditioners do not have a supply air path called a one-dimensional sound field. Even if a sound source for cancellation is installed in the air supply path, it is the same as the case of implementing active noise cancellation in a three-dimensional sound field as described above. Depending on the indoor location There are places where it feels noisy, so it cannot be practically used
In fact, although various studies have been made on techniques for reducing operating noise as in Patent Documents 1 to 3, there are no practical examples at all.

Method used

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  • Operational noise control method for air conditioner
  • Operational noise control method for air conditioner
  • Operational noise control method for air conditioner

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0078] figure 1 It is a schematic side sectional view of the indoor unit showing the state in which the air conditioner of the first embodiment is in operation, figure 2 It is a schematic side cross-sectional view of an indoor unit showing an example of the operating state of the air conditioner according to the first embodiment, image 3 It is a schematic side cross-sectional view of an indoor unit showing another example of the operating state of the indoor unit of the air conditioner according to the first embodiment.

[0079] Such as Figure 1 ~ Figure 3 As shown, an indoor unit 1 of an air conditioner holds a main body by a casing 2 , and a front panel 3 is detachably attached to the casing 2 , and a suction port 4 is provided on the upper surface side of the front panel 3 . The casing 2 and the front panel 3 constitute the box body of the indoor unit 1 .

[0080] Claws (not shown) are provided on the rear side of the casing 2, and the casing 2 is supported by engagin...

no. 2 approach

[0111] Figure 10 It is a schematic side cross-sectional view showing an example of an operating state of the indoor unit 1 of the air conditioner according to the second embodiment. In this figure, with the above Figure 1 ~ Figure 3 The same part as the indoor unit of the air conditioner of the shown 1st Embodiment is assigned the same code|symbol, and abbreviate|omits description.

[0112] In the indoor unit 1 of the air conditioner of the present embodiment, as Figure 10 As shown, on the upper wall 6a of the air blowing path 6, facing the air blowing path 6, a reference microphone (reference detecting sound device) 22 is provided. , a sound wave of an opposite phase to the sound wave detected by the reference microphone 22 is emitted from the speaker 21 . As shown in the figure, it is preferable to arrange the reference microphone 22 upstream of the speaker 21 in the pipe-shaped blowing passage 10 so that no sound waves emitted from the speaker 21 that are not detectio...

no. 3 approach

[0126] Figure 15 It is a schematic side cross-sectional view showing an example of the operating state of the indoor unit 1 of the air conditioner according to the third embodiment. In this figure, with the above Figure 10 The same part as the indoor unit of the air conditioner of the shown 2nd Embodiment is denoted by the same code|symbol, and description is abbreviate|omitted.

[0127] Such as Figure 15 As shown, in the indoor unit 1 of the air conditioner of this embodiment, in addition to the reference microphone 22, the air guide panel 20 also has a correction microphone (correction detection sound device) for detecting sound waves after canceling the operating noise. 23, and correct the sound wave emitted from the speaker 21 so that the noise level detected by the correction microphone 23 is within a specified range. In this case, it is preferable to dispose the correction microphone 23 downstream of the speaker 21 of the duct-shaped blowing passage 10 so as not to...

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Abstract

An operation noise control method for an air conditioner includes: a step (S1) of detecting an operation mode of the air conditioner; a step (S2) of operating an air flow guide panel (20) in accordance with the detected operation mode and controlling the air flow guide panel (20) so as to form a duct-like outlet passage (10) in a vicinity of an outlet (5); a step (S3) of selecting a sound wave which is preset in accordance with the operation mode; and a step (S4) of radiating the selected sound wave in the duct-like outlet passage (10) from a speaker (21).

Description

technical field [0001] The present invention relates to an operation noise control method of a wall-mounted air conditioner, and more specifically, to a method capable of reducing operation noise 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) that overlaps the opposite phase of the noise has been proposed. The Cancellation uses sound waves to cancel out 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 the panel speaker generates noise having substantially the same frequency and substantially the same sound pressure level as noise of a specific frequency detected by the microphone. , Sound waves with substantially opposit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/02F24F13/20G10K11/178F24F1/0073
CPCG10K11/178F24F13/24G10K2210/112G10K2210/104F24F1/0007F24F2013/247G10K11/17825G10K11/17881G10K11/17857G10K11/17821G10K11/1783F24F1/0073
Inventor 竹田康坚大塚雅生
Owner SHARP KK