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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electric machine, and more particularly to a noise reduction mechanism.
2. Description of the Related Art Noise from household electrical appliances and air conditioners
in buildings, which are installed in the room space of a general household, is a problem. There is
a technology called active control that mutes the sound emitted.
This active control generates an artificial sound having a phase opposite to that of the sound of
the noise source and having the same wavelength and the same amplitude as the sound of the
noise source, and interferes with this artificial sound and the sound from the noise source. In
addition, in order to make this muffling effect correspond to changes with time and changes in
the target sound, the muffling degree at the muffling point is detected by a sensor, which is fed
back to the control sound generation device, In response, there is a technique called adaptive
active control in which the noise reduction effect is controlled to be maximum by controlling the
filter of the control sound generation device.
The low frequency noise, which has become a problem in recent years, has a long wavelength as
sound and easily penetrates the sound absorbing material, so that it is easy to diffract an
obstacle. .
However, since active control is effective at low frequencies, it is considered particularly
promising for silencing low frequency noise.
However, when such an active control device is mounted on a product and put to practical use,
the following problems occur.
That is, when the power of the product main body is turned on, the active silencer also operates
regardless of the need for silencing.
Household appliances such as refrigerators and washing machines and air conditioners for
buildings do not always have a rotating machine such as a compressor that is a noise source even
when the main power is turned on.
For example, the refrigerator keeps the temperature inside the refrigerator constant by on-off
controlling the operation of the rotary machine, the rotary machine that is the noise source is not
always operating, and its operating time is only about half It is only
However, since the silencer operates even when the rotary machine is stopped, the adaptive filter
responds to external noise, causing the adaptive filter to diverge, such as overflow, making it
impossible to produce control noise for silencing. Then, there is a problem that an abnormal
sound may be generated from a speaker that emits a sound for muffling, and the muffling
apparatus may in turn become a noise generating apparatus. In addition, when the rotary
machine is stopped, if the silencer operates even though it is not necessary to mute, wasteful
power is consumed.
As described above, since the conventional muffling apparatus is configured to operate even
when the machine that is the noise source is stopped, it is possible to use a speaker that emits a
sound for muffling. An abnormal sound may be generated, and the muffling device may in turn
become a noise generating device.
In addition, when the machine is stopped, wasteful power is consumed when the silencer
operates even though there is no need to mute the machine.
The present invention has been made in view of the above situation, and it is an object of the
present invention to provide an electric machine with a muffling function capable of muffling
with good compatibility without performing unnecessary power consumption.
Structure of the Invention
SUMMARY OF THE INVENTION In order to achieve the above object, an electroacoustic
transducer that generates a sound for muting a sound generated from a sound source of a
machine, and an opening through which the sound from the sound source leaks The present
invention relates to an electric machine comprising an active muffling apparatus including a
muffling monitor for monitoring muffling degree in a motor and muffling control means for
controlling an electro-acoustic transducer in accordance with an output of the muffling monitor.
The gist of the present invention is to have drive control means for stopping the operation of the
active silencer when the drive of the machine is stopped.
According to the above configuration, when the machine is stopped, the drive control means
gives an instruction to stop the operation of the active silencer and controls the electro-acoustic
transducer in accordance with the output of the mute monitor. As such, it is possible to properly
mute the sound, and not to emit abnormal noise, and to avoid unnecessary power consumption.
This is because there is no need to disturb the adaptive control by the external sound when the
machine is stopped, and since there is no sound produced by the speaker or monitoring of the
mute level, there is no extra power consumption. .
Embodiments of the present invention will now be described in detail with reference to the
As shown in the block diagram of FIG. 1, this refrigerator with a muffler is provided with a
refrigerator main body for storing food, the silencer 1, a compressor 2 for heat exchange, and the
cooling side of the compressor 2. The fan 3 for feeding the cooled air into the refrigerator body,
the defroster 4 for defrosting the frost on the cooling side of the compressor 2, the display device
5, and operation / stop of these devices A control microcomputer 6 as a drive control means for
sending a signal is disposed, and the muffling apparatus 1 is controlled by the control
microcomputer 6 so as to be operated according to the operation of the compressor. Do.
Then, the temperature inside the chamber is adjusted by controlling the operation of the
compressor by controlling the operation of the compressor by controlling the operation of the
compressor by the control microcomputer 6 based on the output of the temperature sensor 7
provided in the chamber. It has become.
The interior of the refrigerator is maintained at 2 to 6 ° C. to maintain the freshness of foods
such as fish and meat.
In the refrigerator body 8, as shown in FIG. 2, the machine room 9 has a configuration in which
the compressor 2 is installed inside and only the back side thereof is opened in a rectangular
shape. A closed, duct-like space area is formed.
At this time, the machine room cover 10 is formed of a material such as iron or the like which is
excellent in thermal conductivity and large in sound transmission loss, and its peripheral portion
is attached to the opening edge of the machine room 9. Is provided with an opening 11 for
evaporation of water generated by heat radiation and defrosting of the compressor.
Further, since the sound naturally also escapes from the opening 11, a muffling device 1 is
provided as a muffling countermeasure for this sound.
As shown in FIG. 3, this noise reduction device is used to output the noise reduction speaker 12
provided in the machine room 9, the evaluation microphone 13 provided in the vicinity of the
opening 11 of the machine room 9, and the evaluation microphone 13. Accordingly, the system
comprises a muffling control device 14 for controlling the control sound output from the
muffling speaker 12 and a sound source detection sensor 15 for detecting whether the
compressor 2 as a sound source emits noise.
Note that this silencer emits control sound from the muffling speaker 12, superimposes noise on
the noise at the opening 11 and mutes it, confining the sound in the duct, and actively controlling
so that no sound is emitted from the opening. Is supposed to do.
In addition, an evaluation microphone 13 is attached near the opening 11 in order to monitor the
amount of muffling at the opening 11 and correct the muffling apparatus so as to obtain an
appropriate muffling amount.
The muffling control device 14 generates a control sound signal for muffling, drives the muffling
speaker 12, and uses the signal of the muffled and remaining sound detected by the muffling
evaluation microphone 13, and this signal is adapted to be minimized. Take control.
Next, the operation of this control microcomputer will be described using the time chart shown
in FIG.
Here, the temperature sensor 7 constantly detects the internal temperature, and a signal is sent
to the control microcomputer 6. The control microcomputer turns the operation of the
compressor 2 on and off based on this output, and the upper limit temperature and the lower
limit temperature It is supposed to be maintained in between.
When the internal temperature rises to the upper limit temperature, an instruction is given from
the control microcomputer 6 so that the compressor 2 and the internal fan 3 operate, but a
predetermined time necessary for the initialization of the silencer 1 is ahead Are instructed to
operate the silencer 1.
On the other hand, when the internal temperature drops to the lower limit temperature, the
control microcomputer 6 stops the compressor 2 and the internal fan 3 and also stops the
silencer 1.
Also from the stop of the compressor 2 and the internal fan 3 here, the operation of the silencer
is continued longer by the time necessary for data storage.
This is to save the information for making control sound in the EEPROM in the silencer, so that
the mute can be started immediately at the next start.
Here, the power switch A is disposed between the control microcomputer 6 and the muffling
control device 14, and the muffling device is turned on and off by turning the power switch on
and off. A signal may be given to 14 to put the muffling apparatus 1 in the stop mode, stop and
power down.
The operation of the compressor 2 is started by the instruction of the control microcomputer 6
based on the output of the temperature sensor 7, and the air in the refrigerator is cooled.
The air cooled by the cooler is fed into the storage by the internal fan 3 which operates
simultaneously with the start of operation of the compressor.
Further, when the temperature sensor 7 provided in the storage detects the temperature in the
storage, the control microcomputer 6 is controlled based on this output to turn on / off the
power to control the operation of the compressor 2.
Thus, the temperature in the storage compartment is maintained at 2 to 6 ° C., and the noise is
Thus, since the control microcomputer 6 gives an instruction to stop the operation of the silencer
1 when the compressor 2 is stopped, unnecessary power consumption can be avoided.
Further, since the electro-acoustic transducer is controlled in accordance with the outputs of the
sound source detection sensor and the muffling monitor, the muffling can be appropriately
performed and no abnormal sound is emitted.
Although the noise cancellation of the refrigerator has been described in the above embodiment,
the present invention can be applied to household electric appliances such as washing machines,
vacuum cleaners, hair dryers, air conditioners, air conditioners such as buildings, automobiles,
etc. .
In any case, the construction of the silencer shown in FIG. 3 is almost the same, and this
compressor 2 only replaces the motor of the washing machine and the vacuum cleaner, the
compressor of the air conditioner, and the engine of the automobile.
For example, in a washing machine where the finish time is set to morning and the operation is
started according to that time, it is necessary to operate the silencer for night operation, and the
present invention is particularly effective.
As described above, according to the present invention, when the machine is stopped, the drive
control means gives an instruction to stop the operation of the active silencer, and the output of
the muffling monitor is output. Accordingly, since the electroacoustic transducer is controlled,
the reliability of the muffling function can be improved and the power saving effect can be
Brief description of the drawings
1 is a block diagram of the refrigerator according to the embodiment of the present invention 2 a
diagram showing the machine room structure of the same refrigerator
Fig. 4 Timing chart from the control microcomputer of the same device
Explanation of sign
DESCRIPTION OF SYMBOLS 1 sound deadening device 2 compressor 3 interior fan 4 defrosting
device 5 display device 6 control microcomputer 7 temperature sensor 8 refrigerator main body
9 machine room 10 machine room cover 11 opening 12 muffling speaker 13 evaluation
microphone 14 muffling control device 15 sound source detection sensor
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