JPH02115510A - Muffler - Google Patents

Abstract

PURPOSE:To lower the noise of an air conditioner main body, by providing noise sources, a sound source portion approximate to noises from noise sources in advance, and a sound emitting means changing a signal from the sound source data into sound. CONSTITUTION:A heat exchanger 2 conducts the heat exchange of a refrigerant and room air. A fan 3 is connected to a motor and conducts ventilation. At a wind tunnel 4, room air, after passing through the heat exchanger 2, is delivered out again to the inside of a room by means of the fan 3. A sound emitting means 5 is generated by a sound source data portion provided in advance, and is made to be of a reverse phase from noises generated by the heat exchanger 2, the fan 3 and the wind tunnel 4 and the like. A sound receiving means 6 detects the compound sound of the sound emitting means 5 and noises generated by the heat exchanger 2, the fan 3 and the wind tunnel 4 and the like. Thus, the lowering of noises is realized by taking advantage of a phenomenon in which noises from noise sources and a reverse phase sound from the sound emitting means cancel each other.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application Equipment having moving parts such as motors, fans, valves, and sliding parts generate noise when operating. There is a strong social need to keep this noise low.

TECHNICAL FIELD The present invention relates to a muffler having a movable part for reducing mH noise.

BACKGROUND OF THE INVENTION Conventionally, in order to reduce the noise of equipment, efforts have been made to reduce the noise of the parts used in the equipment, as well as to provide sound insulation.

A method has also been devised in which the noise from equipment is received by a microphone, the sound is output out of phase, and the sound is synthesized with the noise to reduce the noise level.

Problems to be Solved by the Invention However, with structures such as sound insulation, there is a certain limit to reducing the vibration and noise generated by the equipment, and sufficient results have not been obtained due to the size and cost of the equipment itself.

In addition, the method of reducing noise using a microphone requires a microphone that receives the noise and a microphone that monitors the synthesized sound, and the microphone that receives the noise must be made so that it is not affected by the synthesized sound. However, there were issues with the system becoming complex and large-scale.

An object of the present invention is to reduce noise generated from equipment by generating sounds with opposite phases from a sound source data section installed in advance and canceling each other out.

Means for Solving the Problems In order to solve the above problems, the present invention provides a noise source, a sound source data section that approximates the noise from the noise source in advance, and a sound generating means for converting the signal from the sound source data section into sound. Consisting of
The noise generated from the noise source and the sound generated from the sound generating means are combined to reduce the noise level.

The present invention also provides a noise source, a sound source data section that approximates the noise from the noise source in advance, a phase adjustment means that adjusts the phase of a waveform of the sound source data section, and a level that adjusts the volume of the sound source data section. adjustment means; sound generation means for converting signals from the phase adjustment means and the level adjustment means into sounds;
a sound receiving means for detecting a synthesized sound of the sound generated from the noise source and the sound generating means; a sound pressure determining means for determining the sound pressure level of the sound received by the sound receiving means; A control means for adjusting the phase adjustment means and the level adjustment means in response to an output is provided, and the control means controls the phase adjustment means and the level adjustment means so that the input level of the sound pressure determination means is minimized. The noise level generated by combining the noise generated from the noise source and the sound generated from the sound generation means is brought to approximately zero.

Further, in the present invention, when the noise source has a linear distribution or a planar distribution, the noise source is a plurality of sound generating means arranged.

Further, in the present invention, in an air conditioner body having a heat exchanger and a fan, noise generated from the heat exchanger, the fan, etc. is used as the noise source.

Function The present invention constitutes a sounding means having an opposite phase between the noise from the noise source and the sound source data section installed in advance for the noise from the noise source, and the sounding means is placed near the noise source.
Noise reduction is achieved by utilizing the phenomenon in which the noise from the noise source and the anti-phase sound from the sound generating means cancel each other out.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 1 is a side sectional view of an indoor unit of an air conditioner.

In the figure, l is the outer shell of the air conditioner indoor unit, and 2
5 is a heat exchanger that exchanges heat between the refrigerant and the indoor air; 3 is a fan that is connected to a motor and blows air; 4 is a wind tunnel in which the indoor air passes through the heat exchanger 2 and then is sent back into the room by the fan 3; is generated by a pre-installed sound source data section, and the sound generation means is in opposite phase to the noise generated from the heat exchanger 2, fan 3, wind tunnel 4, etc., and 6 is generated from the heat exchanger 2, fan 3, wind tunnel 4, etc. This is a sound receiving means that detects the synthesized sound of the noise produced by the sound generating means 5 and the sound generating means 5.

When the noise generated from the heat exchanger 2, the fan 3, the wind tunnel 4, etc. and the opposite phase sound generated from the sound generating means 5 are opened on the indoor side, they cancel each other out and the level is significantly reduced.

FIG. 2 is a block diagram showing the configuration of the first embodiment of the present invention. The sound generated in the sound source data section is sent out from the sound generating means as having a phase opposite to that of the noise.

FIG. 3 is a block diagram showing the configuration of a second embodiment of the present invention. The sound generated from the sound source data portion passes through the phase adjustment means and the level adjustment means, becomes in phase opposite to the noise from the noise source, and is sent out from the sound generation means. At this time, the sound receiving means is
A synthesized sound of the noise from the noise source and the sound from the sound generating means is detected, and the sound pressure level is sent to the control means via the sound pressure determining means.

The control means controls the phase adjustment means and the level adjustment means so as to minimize the sound pressure level from the sound pressure determination means.

In this way, when the noise generated from the heat exchanger 2, fan 3, wind tunnel 4, etc. and the opposite phase sound generated from the sound generating means 5 are heard indoors, they cancel each other out and the level is significantly reduced. .

FIG. 4 is a perspective projection view of an indoor unit of an air conditioner showing a third embodiment of the present invention. In the indoor unit of the air conditioner, noise generated from the heat exchanger 2, fan 3, wind tunnel 4, etc. all have the same axial cross-sectional shape, and are distributed symmetrically in the axial direction of the fan 3.

By arranging a plurality of sound generating means in the axial direction of the fan 3, they are made to face the noise sources distributed symmetrically in the axial direction.

It goes without saying that the sound source may be arranged in a planar manner, and that a plurality of sound receiving means, sound pressure determination means, control means, sound source data section, phase adjustment means, and level adjustment means may be provided.

Effects of the Invention According to the present invention, although it is necessary to align the phases of the noise sources, it is possible to significantly reduce the noise of equipment having moving parts.

Further, as shown in the second embodiment, the synthesized sound can be monitored under the control of the control section and the synthesized sound can be always minimized by adjusting the phase and level of the sound source data.

Further, as shown in the third embodiment, in the case of an air conditioner indoor unit, the noise is distributed symmetrically in the axial direction of the fan 3, and therefore, by arranging a plurality of sounding means, the noise reduction effect is large.

Furthermore, even when the noise sources are distributed linearly or planarly, a plurality of sound sources can be arranged linearly or planarly to minimize the synthesized sound.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of an air conditioner showing an embodiment of the present invention;
2 and 3 are block diagrams showing the configuration of the same embodiment,
FIG. 4 is a perspective projection view of an air conditioner according to another embodiment. 1... Outer shell of the air conditioner, 2... Heat exchanger, 3... Fan, 4... Wind tunnel, 5...
...Producing means, 6... Sound receiving means. Name of agent: Patent attorney Shigetaka Awano -゛-Netbun Sanon 3-゛Fan 4--M, J5 same 5-Pronunciation means 6--Reception role number?

Claims (4)

[Claims] (1) Consisting of a noise source, a sound source data section that approximates the noise from the noise source in advance, and a sounding means that converts the signal from the sound source data section into sound, and the noise generated from the noise source and the sounding means A silencer that synthesizes generated sounds and reduces the noise level. (2) a noise source, a sound source data portion that approximates the noise from the noise source in advance, a phase adjustment device that adjusts the phase of the waveform of the sound source data portion, and a level adjustment device that adjusts the volume of the sound source data portion. a sound generating means for converting the signals from the phase adjusting means and the level adjusting means into sound; a sound receiving means for detecting a synthesized sound of the sound generated from the noise source and the sound generating means; sound pressure determination means for determining the sound pressure level of the sound; and control means for adjusting the phase adjustment means and the level adjustment means in response to the output of the sound pressure determination means; The phase adjustment means and the level adjustment means are controlled to minimize the input level of the pressure determination means, and the noise generated from the noise source and the sound generated from the sound generation means are combined to reduce the noise level to approximately zero. Silencer. (3) A silencer according to claim (1) or (2), wherein a plurality of sound generating means are arranged along the distribution of the noise source. (4) In an air conditioner main body having a heat exchanger and a fan, the noise source is noise generated from the heat exchanger, the fan, etc.
) or (3).