JPH0975767A - Crude refuse pulverizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crude refuse pulverizing device with which the decrease of the noises generated at the time of pulverizing crude refuse is possible. SOLUTION: A pulverizing section 1 pulverizes the crude refuse entering from a charge port 11C by a rotary blade 12. A silencing section 2 listens to the noises generated by rotation of the rotary blade 12 at the time of polarizing the crude refuse. The silencing section 2 forms the sound waves for negating the listened noises from the listened noises. The silencing section 2 radiates the formed sound waves into the pulverizing section 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a garbage crushing apparatus installed on a kitchen sink or the like.

[0002]

2. Description of the Related Art A garbage crushing apparatus is used with its input port connected to a drain port such as a sink. The garbage crushing device crushes the garbage that enters from the input port with a rotary blade, and causes the generated crushed material to flow into a drain pipe together with water. The rotary blade is rotated by a motor incorporated in the garbage crushing device. An indoor drainage system using this garbage crusher is disclosed in Japanese Patent Laid-Open No. 3-1.
No. 61623.

In such a garbage crushing device, the rotation of the motor causes the device to vibrate. The vibration sound due to this vibration is transmitted from the garbage crushing device to the sink and causes noise in the garbage crushing device. For this reason, a flexible pipe is connected between the drain port of the sink and the input port of the garbage crushing device, and a vibration isolator is provided. As a result, it is possible to prevent the vibration of the garbage crusher from propagating.

[0004]

By the way, the garbage crushing apparatus crushes the garbage by rotating the motor. As a result, the rotation sound of the motor and the crushing sound of the garbage are emitted as noise from the charging port of the garbage crushing device. In the garbage crushing device, these sounds cause noise as well as vibration.

It is an object of the present invention to provide a raw dust crushing apparatus which eliminates such drawbacks and can reduce noise generated when crushing raw dust.

[0006]

In order to achieve the object, the invention of claim 1 is a crushing unit for crushing raw garbage entering from an input port with a rotary blade and flowing the generated crushed product to a drain pipe. Listen to the noise generated when crushing garbage with the rotating blade of the part, and sound waves to cancel the heard noise,
It is characterized by having a muffling part which is generated from the heard noise and radiates the generated sound wave into the crushing part.

According to the first aspect of the invention, the crushing section crushes the raw dust entering from the charging port with the rotary blade. The muffling section listens to the noise generated by the rotation of the rotary blade when the garbage is crushed. The muffling section uses sound waves to cancel the noise heard.
Generated from the noise heard. Then, the muffling section radiates the generated sound wave into the crushing section.

According to a second aspect of the present invention, in the raw garbage crushing apparatus according to the first aspect, the muffling section listens to the residual sound after the muffling, and a sound wave for canceling the heard noise is used. It is characterized by being generated from.

According to the invention of claim 2, the muffling section generates a sound wave for canceling the noise by adding the residual sound after the muffling.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 is a basic configuration diagram showing an embodiment of the present invention. The garbage crushing device of FIG. 1 includes a crushing unit 1 and a muffling unit 2.

The crushing unit 1 includes a crushing unit body 11, a rotary blade 12 for crushing raw garbage, and a motor 1 for rotating the rotary blade 12.
3 is provided.

The crushing unit body 11 of the crushing unit 1 has a cylindrical shape. The crushing unit body 11 includes a motor 13 at the bottom. Further, the crushing unit main body 11 includes a drainage port 11 </ b> A above the motor 13. The drainage port 11A is connected to the drainage pipe 4. The crushing unit body 11 includes a drainage port 11A and a motor 1
A partition plate 11B is provided between the partition plate 3 and 3. The rotary shaft 13A of the motor 13 penetrates the partition plate 11B, and the rotary blade 1 is attached to the end thereof.
2 is provided.

The crushing unit main body 11 is provided with a charging port 11C at its upper part. The drainage port 3A of the sink 3 is connected to the charging port 11C.

A muffling section 2 is provided in the crushing section main body 11. The muffling section 2 includes a muffling section main body 21, microphones 22 and 24, a speaker 23, and a controller 25.

The muffling section body 21 of the muffling section 2 has a hollow portion 21.
A is provided. A speaker 23 is attached inside the hollow portion 21A. The opening portion of the hollow portion 21A is connected to the lower portion of the charging port 11C of the crushing unit 1. And
An elastic film 23A such as a rubber sheet or a gelatin sheet is provided at the opening of the hollow portion 21A. The elastic body film 23A protects the speaker 23 from raw dust, water, and the like that fall on the crushing unit 1. At the same time, the elastic film 23A transmits the sound from the speaker 23 into the crushing unit 1.

The muffling section body 21 has another hollow portion 21B. A microphone 24 is attached inside the hollow portion 21B. The opening portion of the hollow portion 21B is connected to the upper portion of the rotary blade 12. An elastic film 24A such as a rubber sheet or a gelatin sheet is provided at the opening of the hollow portion 21B. The elastic film 24 </ b> A protects the microphone 24 from crushed substances and water generated by the rotation of the rotary blade 12. At the same time, the elastic film 24 </ b> A transmits to the microphone 24 the rotation sound of the rotary blade 12, the crushing sound caused by the rotation of the rotary blade 12, the rotation sound of the motor, and the like.

The microphone 22 is a charging port 1 of the crushing unit 1.
It is attached between 1C and the elastic film 23A.
An elastic film 22A such as a rubber sheet or a gelatin sheet is provided on the mounting surface of the microphone 22. The elastic film 22 </ b> A protects the microphone 22 from raw dust, water, and the like that fall through the crushing unit 1. At the same time, the elastic film 22A transmits the residual noise after the muffling to the microphone 22.

The silencer main body 21 has a controller 2 inside.
5 is provided. Then, the EM terminal of the controller 25 is connected to the microphone 22 and the SP terminal is connected to the speaker 23. Further, the SM terminal of the controller 25 is connected to the microphone 24.

The controller 25, as shown in FIG.
Amplifiers 31A, 32A, 33A, low-pass filters (LPF) 31B, 32B, 33B, DA (digital / analog) converter 31C, AD (analog / digital) converters 32C, 33C, and signal processing circuit 3
4 and.

Upon receiving the residual sound signal from the microphone 22 via the EM terminal, the amplifier 32A amplifies the residual sound signal. The low pass filter 32B removes the high frequency component of the residual sound signal from the amplifier 32A. AD
The converter 32C converts the residual sound signal from the low pass filter 32B into a digital signal, and sends the converted residual sound signal to the terminal 34B of the signal processing circuit 34.

Upon receiving the noise signal from the microphone 24 via the SM terminal, the amplifier 33A amplifies this noise signal. The low pass filter 33B includes the amplifier 3
The high frequency component of the noise signal from 3A is removed. The AD converter 33C converts the noise signal from the low-pass filter 33B into a digital signal, and sends the converted noise signal to the terminal 34C of the signal processing circuit 34.

The DA converter 31C includes the signal processing circuit 3
The digital silencing signal from the terminal 34A of No. 4 is converted into analog. The low-pass filter 31B removes the high frequency component of the silence signal from the DA converter 31C. The amplifier 31A amplifies the muffling signal from the low pass filter 31B and sends it to the speaker 23 via the SP terminal.

The signal processing circuit 34 is provided with a computer, and the computer is used to process two systems for muffling. In the first processing system, the signal processing circuit 34
Calculates the filter coefficient of the correction filter by the equivalent circuit shown in FIG. The signal processing circuit 34 will be described below using this equivalent circuit.

The signal processing circuit 34 includes a noise generator 41. The noise generation unit 41 generates a white noise signal X _i whose frequency is band-limited to 1000 [Hz]. That is, the noise generator 41 generates a signal having a frequency of 1000 [Hz] or less. The subscript i represents time. The noise generator 41 sends the white noise signal X _i to the correction filters 42 and 45 and the adaptive filters 43 and 46. At the same time, the noise generator 41 outputs the white noise signal X _i to the terminal 34.
Send to A.

The white noise signal X _i is applied to the crushing unit 1 from the terminal 34A of the signal processing circuit 34 via the DA converter 31C → low-pass filter 31B → amplifier 31A → speaker 23. White noise signal X _i
Becomes pseudo noise and propagates through the hollow portion of the crushing unit 1. Then, the microphone 24 listens to this pseudo noise and generates a pseudo noise signal. This pseudo noise signal is generated by the microphone 24 → amplifier 33A → low pass filter 3
The signal is added to the terminal 34C of the signal processing circuit 34 via the 3B → AD converter 33C.

The subtractor 47 of the signal processing circuit 34 has a terminal 3
The error signal εH _i is generated by calculating the difference between the pseudo noise signal added to 4C and the correction signal YH _i from the correction filter 45. The adaptive filter 46 uses the input white noise signal X _i and error signal εH _i and the previously calculated filter coefficient b _{k, i} based on the following equation to generate a new filter coefficient b _{k + 1. , i} is calculated. The initial value of the filter coefficient b _{k, i} is set to a random value or zero.

[0027]

[Equation 1] In this equation, μ is a convergence coefficient. Adaptive filter 46
Sends the calculated filter coefficient b _{k, i} to the correction filter 45.

The correction filter 45 uses the filter coefficient b _{k, i} from the adaptive filter 46 to calculate the correction signal YH _i from the following equation.

[0029]

[Equation 2] In this equation, N is the order of the filter.

As described above, the transfer characteristic from the speaker 23 to the microphone 24 is obtained by the adaptive control using the correction filter 45 and the adaptive filter 46. In particular, the effect of the low-pass filter by the elastic film 23A, 24A installed on the speaker 23 and the microphone 24 can be added.

On the other hand, the pseudo noise from the speaker 23 propagates through the hollow portion of the crushing unit 1 and reaches the microphone 22. The microphone 22 listens to this pseudo noise,
Generate a pseudo noise signal. This pseudo noise signal is generated by the microphone 22 → amplifier 32A → low pass filter 3
The signal is added to the terminal 34B of the signal processing circuit 34 via the 2B → AD converter 32C.

The subtractor 44 of the signal processing circuit 34 has a terminal 3
The difference between the pseudo noise signal added to 4B and the correction signal YC _i from the correction filter 42 is calculated to generate the error signal εC _i . The adaptive filter 43 uses the input white noise signal X _i and error signal εC _i and the previously calculated filter coefficient a _{k, i} to calculate a new filter coefficient a _{k + 1} by using the following equation. _{, i} is calculated. The initial value of the filter coefficient a _{k, i} is set to a random value or zero.

[0033]

(Equation 3) The adaptive filter 43 sends the calculated filter coefficient a _{k, i} to the correction filter 42.

The correction filter 42 uses the filter coefficient a _{k, i} from the adaptive filter 43 to calculate the correction signal YC _i from the following equation.

[0035]

(Equation 4) In this way, the correction filter 42 and the adaptive filter 43
The transfer characteristic from the speaker 23 to the microphone 22 is obtained by the adaptive control using.

The signal processing circuit 34 performs the above processing in one sampling period to calculate the filter coefficients a _{k, i} and b _{k, i} by the adaptive filters 43 and 46.

In the next processing system, the signal processing circuit 34
The equivalent circuit shown in FIG. 4 mutes the sound. The signal processing circuit 34 will be described below using this equivalent circuit.

The signal processing circuit 34 outputs the noise signal X1 _i corresponding to the noise heard by the microphone 24 to the terminal 34C.
Receive via. The signal processing circuit 34 uses the noise signal X
1 _i is sent to the subtractor 51. The subtractor 51 outputs the noise signal X1 _i
And a correction signal Y1 _i from the correction filter 52 are calculated to generate a silence signal X2 _i .

The control filter 55 uses the filter coefficient determined by the adaptive filter 54 to suppress the mute signal X2.
_i is corrected to generate a muffling signal Y _i . The control filter 55 sends the generated silence signal Y _i to the terminal 34A and the correction filter 52.

The correction filter 52 corrects the silence signal Y _i using the filter coefficient calculated by the adaptive filter 46 of FIG. That is, the correction filter 52 mainly corrects the transfer characteristics due to the influence of the elastic body films 23A and 24A of the crushing unit 1. With this correction, the correction filter 52 generates the correction signal Y1 _i . The subtractor 51 uses the correction signal Y
By subtraction using 1 _i , the noise signal X1 _{i is} corrected by the transfer characteristic in the crushing unit 1, and the mute signal X2 _i is added.
Generate

The correction filter 53, using a filter coefficient adaptive filter 43 is calculated in FIG. 3, mute signal X2 _i
Detect the residual sound of. Then, the correction filter 53 generates the target signal X2c _i from the residual sound, and the adaptive filter 5
Send to 4. The adaptive filter 54 receives the target signal X2c _i and the signal corresponding to the residual sound from the terminal 34B as the error signal ε _i .

The adaptive filter 54 uses the input target signal X2c _i and error signal ε _i and the previously calculated filter coefficient c _{k, i} as the basis to calculate a new filter coefficient c _k using the following equation. Calculate _{+ 1, i} . The initial value of the filter coefficient c _{k, i} is set to a random value or zero.

[0043]

(Equation 5) The adaptive filter 54 sends the calculated filter coefficient c _{k, i} to the control filter 55.

The control filter 55 uses the filter coefficient c _{k, i} to calculate the silence signal Y _i from the following equation.

[0045]

(Equation 6) The signal processing circuit 34 performs the above processing in one sampling cycle and forms a second processing system.

Next, the operation of this embodiment will be described.

The signal processing circuit 34 causes the noise generator 41 of the equivalent circuit of FIG. 3 to generate the white noise signal X _i . The white noise signal X _i is input from the terminal 34A to the speaker 23 via the DA converter 31C → low-pass filter 31B → amplifier 31A.

The speaker 23 radiates the white noise signal X _i as pseudo noise. The pseudo noise propagates through the elastic film 23A and propagates through the hollow portion of the crushing unit 1. Further, the pseudo noise propagates through the elastic film 24A and reaches the microphone 24. The microphone 24 hears this pseudo noise,
Generate a pseudo noise signal. The pseudo noise signal is applied to the terminal 34C of the signal processing circuit 34 via the amplifier 33A → low-pass filter 33B → AD converter 33C.

The subtractor 47 of the signal processing circuit 34 has a terminal 3
The difference between the pseudo noise signal from 4C and the correction signal YH _i from the correction filter 45 is calculated to generate the error signal εH _i . The adaptive filter 46 uses Equation (1) based on the error signal εH _i , the white noise signal X _i from the noise generator 41, and the previously calculated filter coefficient b _{k, i} to generate a new filter coefficient b _k. Calculate _{+ 1, i} . The correction filter 45 is
Using the filter coefficients b _{k, i} from the adaptive filter 46,
The correction signal YH _i is calculated from the equation (2).

By this adaptive control, the signal processing circuit 34
Calculates the transfer characteristic mainly by the elastic films 23A and 24A.

At the same time, the pseudo noise from the speaker 23 is
It propagates through the hollow portion of the crushing unit 1, propagates through the elastic film 22A, and reaches the microphone 22. Microphone 22
Listens to this pseudo noise and generates a pseudo noise signal. The pseudo noise signal is added to the terminal 34B of the signal processing circuit 34 via the amplifier 32A, the low pass filter 32B, and the AD converter 32C.

The subtractor 44 of the signal processing circuit 34 has a terminal 3
The difference between the pseudo noise signal from 4B and the correction signal YC _i from the correction filter 42 is calculated to generate the error signal εC _i . The adaptive filter 43 uses Equation (3) based on the error signal εC _i , the white noise signal X _i from the noise generator 41, and the previously calculated filter coefficient a _{k, i} to generate a new filter coefficient a _k. Calculate _{+ 1, i} . The correction filter 42 is
Using the filter coefficient a _{k, i} from the adaptive filter 43,
The correction signal YC _i is calculated from the equation (4).

By this adaptive control, the signal processing circuit 34
Calculates the transfer characteristic mainly by the elastic films 22A and 23A.

After that, when the rotary blade 12 is rotated by the motor 13 and the raw dust is crushed, noise is generated by this crushing. The noise reaches the microphone 24 via the hollow portion of the crushing unit main body → the elastic film 24A. The microphone 24 listens to noise and generates a noise signal. The noise signal is applied to the terminal 34C of the signal processing circuit 34 of FIG. 4 via the amplifier 33A → low-pass filter 33B → AD converter 33C.

The subtractor 51 of the signal processing circuit 34 has a terminal 3
The difference between the noise signal X1 _i from the 4C and the correction signal Y1 _i from the correction filter 52 is calculated to generate the silence signal X2 _i . Further, mute signal X2 _i is transmitted by the control filter 55 mute signal Y _i, and the terminal 34A. The silence signal Y _i is applied to the speaker 23 via the DA converter 31C → low-pass filter 31B → amplifier 31A. Speaker 23
Emits a sound for silencing from the silencing signal Y _i . This sound propagates through the elastic film 23A and is radiated into the hollow portion of the crushing unit 1. With this sound, noise generated by the rotation of the rotary blade 12 is silenced.

When there is a residual sound after the muffling, the residual sound is transmitted through the elastic film 22A and reaches the microphone 22. The microphone 22 listens to the residual sound and generates a residual sound signal. The residual sound signal is added as an error signal ε _i to the terminal 34B of the signal processing circuit 34 via the amplifier 32A → low-pass filter 32B → AD converter 32C.

On the other hand, the correction filter 53 detects the residual sound of the silence signal X2 _i by using the filter coefficient calculated by the adaptive filter 43 of FIG. Then, the correction filter 53
Generates a target signal X2c _i from the residual sound and sends it to the adaptive filter 54.

The adaptive filter 54 uses the equation (5) based on the target signal X2c _i from the correction filter 53, the error signal ε _i , and the previously calculated filter coefficient c _{k, i,} and a new filter coefficient c Calculate _{k + 1, i} . The control filter 55 has a filter coefficient c from the adaptive filter 54.
_The mute signal Y _i in which the residual sound is added from the equation (6) using _{k and i}
Is calculated.

Based on the mute signal Y _i , the speaker 2
Since 3 is muted, the noise due to the rotation of the rotary blade 12 can be completely muted.

In this embodiment, the elastic films 22A, 24A, and
23A was used. The elastic film 22A, 23A, 24A is
Works like a low-pass filter. The characteristics of the filter can be changed by changing the thickness and composition of the elastic film 22A, 23A, 24A. As a result, the attenuation characteristics of the low pass filters 31B, 32B, 33B can be made gentle, and the low pass filter 3
The design of 1B, 32B, and 33B can be simplified. Furthermore, it is possible to eliminate a time delay and to mute with high precision.

[0061]

As described above, according to the invention of claim 1, the noise generated when crushing the garbage is canceled by the generated sound wave, so that the noise can be reduced.

According to the invention of claim 2, it is possible to muffle the residual sound generated after the noise is muffled.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a controller.

FIG. 3 is a diagram showing an equivalent circuit of a signal processing circuit when calculating filter coefficients.

FIG. 4 is a diagram showing an equivalent circuit of a signal processing circuit at the time of silence.

[Explanation of symbols]

 1 crushing part 11 crushing part main body 12 rotary blade 13 motor 2 muffling part 21 muffling part body 22 microphone 23 speaker 24 microphone 25 controller 3 sink

Claims (2)

[Claims] 1. A crushing unit for crushing raw garbage entering from an input port with a rotary blade and flowing the generated pulverized material to a drain pipe, and listening to noise generated when crushing raw garbage with the rotary blade of the crushing unit. A garbage crushing device comprising: a sound deadening unit that generates a sound wave for canceling the heard noise from the heard noise and emits the generated sound wave into the crushing unit. 2. The garbage crushing device according to claim 1, wherein the muffling section listens to the residual sound after the muffling and generates a sound wave for canceling the heard noise from the heard noise and the residual sound. A characteristic garbage crusher.