JP2000201864A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum cleaner capable of surely reducing noise generated by cleaning. SOLUTION: By a microphone 26 disposed at the handle part 25 of a hose 22 connected to a main body case 2 for housing a motor-driven blower 11, the noise at the time of cleaning is collected. To a circuit board for controlling the drive of the motor-driven blower 11, a transmission part 18 is connected. Then, the control means of the circuit board transmits the signals of the control sound of the wavelength of an opposite phase to the wavelength of the collected noise from the transmission part 18 to the reception part 33 of a noise reduction device 36 disposed in a room 31 to be cleaned. Then, the control sound is outputted from the speaker of the noise reduction device 36, the noise at the time of cleaning generated from a vacuum cleaner main body 1 is cancelled by interference and the noise is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner for reducing noise.

[0002]

2. Description of the Related Art Conventionally, this type of vacuum cleaner is disclosed in, for example, Japanese Patent Application Laid-Open No. 5-3841 and Japanese Patent Application Laid-Open No. 7-155.
The configuration described in Japanese Patent No. 275 is known.

[0003] The vacuum cleaner described in Japanese Patent Application Laid-Open No. 5-3841 has a sound collecting means disposed substantially in opposition to the electric blower in a main body case accommodating the electric blower. Sound having the same amplitude and opposite phase to the wavelength of the collected sound is output from a speaker disposed facing the exhaust air path from the electric blower to the exhaust port to reduce noise.

The vacuum cleaner described in Japanese Patent Application Laid-Open No. Hei 7-155275 detects the rotation speed of an electric blower housed in a main body case, performs phase control, and performs a phase control based on a rotation component of the obtained rotation speed signal. , A control sound that interferes with the rotation sound of the electric blower and noise that is an integral multiple of the number of revolutions of the electric blower, which is collected by a microphone disposed in the exhaust air path from the electric blower to the exhaust outlet, The sound is output from a speaker arranged facing the exhaust air path to reduce noise.

[0005]

However, Japanese Patent Application Laid-Open Nos. Hei 5-3841 and Hei 7-155275 describe the above.
In the conventional electric vacuum cleaner described in Japanese Patent Application Laid-Open Publication No. H10-209, the noise generated directly from the electric blower is canceled by the speaker disposed in the main body case, but the vibration caused by the drive of the electric blower that is not canceled by the speaker causes the main body case to vibrate. There is a problem that noise caused by the vibration of the air and noise such as wind noise discharged from the exhaust port are heard as noise by the cleaning operator.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a vacuum cleaner capable of reliably reducing noise caused by cleaning.

[0007]

According to a first aspect of the present invention, there is provided an electric vacuum cleaner, comprising: a main body accommodating an electric blower; a sound collecting means for collecting a cleaning sound generated in the cleaning place; A sound generator disposed at a position separated from the main body and configured to output a sound having a phase opposite to a wavelength of the cleaning sound collected by the sound collector.

A sound generating means for outputting a sound having a phase opposite to the wavelength of the cleaning sound generated in the cleaning place collected by the sound collecting means is provided at a position separated from the main body in the cleaning place. Therefore, noise generated from the entire body housing the electric blower and perceived by the cleaning worker is canceled by the sound from the sound generating means disposed at the place to be cleaned. Noise is reliably reduced.

According to a second aspect of the present invention, there is provided the electric vacuum cleaner according to the first aspect, further comprising a grip portion to be gripped at the time of cleaning, and the sound collecting means being disposed on the grip portion. It is.

[0010] Since the sound collecting means is provided at the grip portion to be gripped at the time of cleaning, the noise is collected at a position closest to the cleaning operator who senses the noise at the time of cleaning. The resulting noise is reduced.

According to a third aspect of the present invention, in the electric vacuum cleaner of the first or second aspect, the electric blower includes a rotatable fan having a plurality of blades, and detects a rotation speed of the fan. The number of revolutions of the fan detected by the number of revolutions detected by the number of revolutions and the number of blades of the fan are multiplied by the number of revolutions of the fan. Control means for causing the sounding means to output a sound having a phase opposite to the wavelength of the sound.

The sound is collected by the sound collection means at a frequency which is an integral multiple of the result of multiplying the number of fan blades by the number of fan blades of the electric blower detected by the control means by the number of rotation detection means. Since the sound having a phase opposite to the wavelength of the cleaning sound is output from the sound generating means, noise generated by rotation of the fan, which is particularly loud during cleaning, is reliably reduced.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vacuum cleaner according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a main body of the electric vacuum cleaner, and the main body 1 of the electric vacuum cleaner closes a main body case 2 having an opening at a front upper surface and an opening at a front upper surface of the main body case 2 so as to be opened and closed. And a lid (not shown). In addition, the main body case 2 is provided with a swivel wheel 3 which is rotatable on the front lower surface, and a driven rear wheel 4 is rotatably mounted on both rear side surfaces.

In the vacuum cleaner main body 1, a dust collecting chamber 8 which is opened upward by a grid-like partition wall 6 and in which a dust collecting bag 7 is detachably mounted is formed at the front of the vacuum cleaner main body 1.
An electric blower room 9 is defined behind the dust collection room 8. An electric blower 11 is provided in the electric blower room 9. This electric blower 11 is shown in FIGS.
As shown in FIG. 1, a fan 13 having a plurality of blades 12, for example, seven blades 12, an electric motor 14 for rotating the fan 13 and a fan cover 15 for covering the fan 13 are provided. And
An intake port (not shown) is formed in the center of the fan cover 15, and an exhaust port (not shown) is formed in the frame of the electric motor 14. The electric blower 11 is supported via a rubber support 16 on a support wall (not shown) whose front and rear portions protrude into the electric blower chamber 9, and the intake port of the electric blower 11 is hermetically sealed in the dust collection chamber 8. Are in communication.

A circuit chamber (not shown) is formed in the main body case 2 above the electric blower chamber 9. A circuit board (not shown) on which a control circuit for controlling the driving of the electric blower 11 is mounted is arranged in this circuit room. In addition, the circuit board is provided with a transmission unit 18 as a transmission unit including a transmission antenna 17 that outputs a predetermined signal by a wireless medium such as radio waves or infrared rays.

Further, on the outer rear surface of the main body case 2,
An exhaust port (not shown) communicating with the exhaust port of the electric blower 11 is formed.

The lid has a rear end pivotally attached to the main body case 2 so as to open and close the dust collecting chamber 8 from above.

Further, on the front surface of the main body case 2, a substantially cylindrical suction port 20 having one end open to the outside and the other end opening to the dust collecting chamber 8 is formed. And this suction port
A connection pipe 23 provided at one end of a hose 22 is detachably connected to 20.

The other end of the hose 22 is provided with a holding portion 25 which is provided with a holding portion 24 protruding in a branch shape at the other end. The grip unit 25 is provided with operation means having various buttons (not shown) for setting the drive of the electric blower 11, and a position where the microphone 26 as a sound collecting means is not covered when the microphone 26 is gripped. That is, it is disposed at the rear end, which is the front end of the grip 24.

A suction port 29 is detachably attached to the tip of the grip 25 of the hose 22 via an extension tube 28.

On the other hand, in a room 31 which is a place to be cleaned, a receiving unit 33 as a receiving means provided with a receiving antenna 32 for receiving a signal transmitted from the transmitting unit 18 of the vacuum cleaner main body 1;
A noise reduction device 36 including a speaker 34 as sounding means and an output amplifier 35 as output means for outputting a sound of a predetermined wavelength from the speaker 34 based on a signal received by the receiving unit 33 is provided. .

Next, the internal structure of the above embodiment will be described with reference to the block diagram shown in FIG.

An electric blower 11 is arranged in the main body case 2 of the electric vacuum cleaner main body 1, and the electric blower 11 is connected to a commercial AC power supply E via a triac Tr for power control.

The gate of the triac Tr is connected to control means 41 constituting a control circuit mounted on a circuit board (not shown) provided in the vacuum cleaner main body 1. The control means 41 is connected to an operation means (not shown) provided on the holding portion 25 of the hose 22. The control unit 41 receives a predetermined current value from the operation unit by operating various buttons of the operation unit, and controls the phase of the triac Tr based on the current value to control the drive of the electric blower 11. It has 42.

Further, the control means 41 is provided with a rotation speed detecting section 43 which is connected to the microcomputer 42 and detects the rotation speed of the fan 13 which is the rotation speed of the electric motor 14 of the electric blower 11. ing.

Further, the control means 41 is provided with an amplifier 44 as a waveform processing means which is connected to the microphone 26 of the hose 22 and removes noise from the sound collected by the microphone 26, shapes the waveform and amplifies the waveform. I have. Further, the control means 41 is connected to the microcomputer while being connected to the amplifier 44,
A filter means 45 is provided for removing a wavelength other than a predetermined wavelength from the noise waveform processed by the amplifier 44. Further, the control means 41 includes a phase control means 46 connected to the filter means 45 and connected to the microcomputer 42, and for processing the predetermined wavelength processed by the filter means 45 in the opposite phase.

The microcomputer of the control means 41
The transmission unit 18 is connected to 42. The microcomputer 42 detects the fan detected by the rotation speed detection unit 43.
The frequency is calculated by multiplying the number of rotations of the fan 13 and the number of blades 12 of the fan 13 by "7", and a waveform having a frequency other than an integer multiple of the calculation result is removed by the filter means 45, and the sound is muted. The frequency of the target noise is determined, the control sound for silencing having the opposite phase to the frequency is determined by the phase control means 46, and the signal of the control sound is output from the transmission unit 18.

Next, the operation of the above embodiment will be described with reference to the drawings.

At the time of normal cleaning, the lid is closed, the connection pipe 23 of the hose 22 is connected to the suction port 20 that opens, and power is supplied to the vacuum cleaner main body 1 to operate the operating means of the grip 25 of the hose 22. By performing the setting operation, the electric blower 11 is driven in a predetermined driving state to perform cleaning. By driving the electric blower 11, the suction opening
Dust is sucked in together with air from a suction port (not shown) opened on the lower surface of the vacuum cleaner 29, and the vacuum cleaner
And is captured in the dust bag 7. The air filtered by the dust bag 7 is supplied to an electric blower.
The air passes through the inside of the electric blower 11 from the intake port 11 and is discharged from the exhaust port to the outside air outside the vacuum cleaner main body 1 as exhaust air.

At the time of this cleaning, a microphone arranged on the hose 22
At 26, noise as a cleaning sound, which is generated during cleaning of the waveform diagram shown in FIG. 4 in the room 31 due to cleaning, is collected and transmitted as an electric signal to the amplifier 44 of the control means 41.

On the other hand, the microcomputer of the control means 41
42 calculates the frequency by multiplying the rotation speed of the fan 13 detected by the rotation speed detection unit 43 by “7” which is the number of the blades 12 of the fan 13. That is, for example, when the rotation speed of the fan is 400
In the case of 00 rpm, the fundamental frequency due to the rotation of the fan is 4
From 0000/60 to about 667 Hz, the noise of this frequency appears as a fundamental frequency as a peak as shown by A in FIG. Then, by multiplying the fundamental frequency by “7” which is the number of blades of the fan 13, about 4667
The noise at the frequency of Hz appears as a peak as shown by B in FIG. Further, it appears as a peak as shown by C in FIG.

On the other hand, the microphone arranged on the hose 22 collects noise of the waveform diagram shown in FIG. 4 generated in the room 31 by cleaning and transmits the noise to the amplifier 44 of the control means 41 as an electric signal. The amplifier 44 removes noise, shapes and amplifies the waveform of the electric signal, amplifies the electric signal, and transmits the amplified signal to the filter unit 45. Then, the filter means 45 removes a waveform component having a frequency other than an integer multiple of the calculation result calculated by the microcomputer from the electrical signal of the noise waveform transmitted from the amplifier 44,
For example, the frequency of the noise to be silenced as shown in the waveform diagram of FIG. 5, which is one of the integer multiple frequencies, is obtained. Further, as shown in FIG. 6, for example, the microcomputer 42 obtains a control sound for silencing having a phase opposite to the frequency of the noise to be silenced by the phase control means 46, and transmits a signal of the control sound from the transmitting unit 18. Output.

Then, the control sound signal transmitted from the transmitting section 18 by a radio medium such as radio waves or infrared rays is transmitted to the noise reduction device 36.
, And a control sound is output from the speaker 34 by the output amplifier. With the output of the control sound, for example, as shown in FIGS. 7 and 8, noise of a predetermined frequency interferes and is canceled, and the noise is reduced.

As described above, according to the above embodiment, the hose 22 connected to the main body case 2 and held by the cleaning operator
The noise generated by the cleaning is collected by the microphone 26 disposed on the grip 25, and the control sound having the opposite phase to the wavelength of the collected noise is output from the speaker 34 disposed in the room 31. Therefore, a control sound generated from the entire vacuum cleaner main body 1 housing the electric blower 11 and interfering with the noise perceived by the cleaner having the hose 22 can be reliably output, and the noise directly generated by the driving of the electric blower 11 can be obtained. Not only that, but also noise generated by cleaning, such as noise generated when the main body case 2 vibrates due to vibration generated by driving the electric blower 11 and noise such as wind noise when exhaust air is exhausted from the exhaust port. It is not necessary to separately provide a sound insulating member such as a sponge or a sound insulating member, and the amount of the sound insulating member or the sound insulating member can be reduced, thereby improving the productivity and improving the electric cleaning. The size of the machine body 1 can be reduced.

Further, the microphone 26 is in a state substantially facing the vacuum cleaner main body 1, which is a source of noise when cleaning, and is branched from the grip portion 25, which is a position that is not covered by the cleaning operator even when gripped. Since it is located at the tip of the protruding grip part 24, it can reliably collect noise and collect sound from the outside, such as the sound of a TV or sound system, to collect sound at the position closest to the cleaning worker. By doing so, it is possible to reliably reduce the noise due to cleaning at a position where the noise from the vacuum cleaner main body 1, which is the loudest noise during cleaning, is most easily collected.

Further, for example, a suction body running on a floor surface
29, vibration occurs due to a step on the floor surface during cleaning, and this vibration may make it impossible to sufficiently collect noise generated from the electric blower main body 1. There is a possibility that the noise of the vacuum cleaner body 1 may not be sufficiently collected by collecting the sound of the dust that has been colliding with the sucked dust. Because of the provision of 26, noise from the vacuum cleaner main body 1, which is particularly loud, can be reliably collected.

The control means 41 controls the rotation speed detecting section.
At an integer multiple of the calculation result obtained by multiplying the rotation speed of the fan 13 of the electric blower 11 and the number of blades 12 of the fan 13 detected at 43, the phase is opposite to the wavelength of the sound collected by the microphone 26. Since the control sound is output from the speaker 34, noise caused by the rotation of the fan 13, which is particularly noise during cleaning, can be reliably reduced.

In the above embodiment, the hose 22
The microphone 26 is disposed on the holding portion 25 of, for example, an extension tube 28,
The suction port body 29 or the room 31 which is the place to be cleaned may be provided. When the control sound is disposed in the room 31, it is preferable that the control sound is not collected by disposing the control sound on the opposite side of the room 31 away from the speaker 34 that outputs the control sound.

The suction port is not limited to the canister type in which the hose 22 is connected to the vacuum cleaner main body 1, and the suction port is connected to the vacuum cleaner main body 1.
Any type of vacuum cleaner, such as an upright type, a handy type, and a self-propelled type, in which an opening is directly formed in the opening, can be used.

[0041]

According to the first aspect of the present invention, the sound generating means for outputting a sound having a phase opposite to the wavelength of the cleaning sound generated in the cleaning place collected by the sound collecting means is provided. Since it is arranged at a position away from the main unit in the cleaning place, noise generated from the entire main body containing the electric blower and perceived by the cleaning worker is canceled by sound from the sounding means disposed in the cleaning place. Not only the noise due to the driving but also the noise caused by the cleaning can be reliably reduced.

According to the vacuum cleaner of the second aspect, in addition to the effect of the vacuum cleaner of the first aspect, since the sound collecting means is provided at the grip portion which is gripped at the time of cleaning, the vacuum cleaner can be used at the time of cleaning. The noise due to cleaning can be reliably collected at the position closest to the cleaning worker who senses the noise, and the noise generated by cleaning can be reliably reduced.

According to the third aspect of the present invention, in addition to the effects of the first or second aspect of the invention, the control means multiplies the rotation speed of the fan of the electric blower by the number of blades of the fan. Since the sound generation means outputs a sound with a frequency that is an integral multiple of the calculated result and opposite in phase to the wavelength of the collected cleaning sound, noise generated by the rotation of the fan, which is particularly loud during cleaning, is ensured. Can be reduced to

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a situation in which noise during cleaning is reduced according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the fan.

FIG. 3 is a block diagram showing an internal structure of the electric vacuum cleaner main body.

FIG. 4 is a waveform diagram showing noise collected by the microphone.

FIG. 5 shows one of noises generated by rotation of the fan.
It is a waveform diagram which shows the noise of two frequencies.

FIG. 6 is a waveform chart showing a control sound that interferes with and cancels out the noise shown in FIG. 5;

7 is a waveform diagram showing a state in which the noise shown in FIG. 5 is canceled out by interfering with the control sound shown in FIG. 6;

FIG. 8 is a waveform chart showing noise subjected to noise reduction processing according to the first embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric cleaner main body 2 Main body case 11 Electric blower 13 Fan 22 Hose 26 Microphone as sound collection means 34 Speaker as sound generation means 41 Control means 42 Revolution detection part as rotation detection means

Claims (3)

[Claims] 1. A main body for accommodating an electric blower, a sound collecting means for collecting a cleaning sound generated in a cleaning place, and the sound collecting means disposed at a position separated from the main body in the cleaning place. A sound generator for outputting a sound having a phase opposite to the wavelength of the cleaning sound collected by the cleaner. 2. The vacuum cleaner according to claim 1, further comprising a grip portion to be gripped during cleaning, and wherein the sound collecting means is disposed on the grip portion. 3. An electric blower rotatably includes a fan having a plurality of blades, a rotation number detecting means for detecting a rotation number of the fan, and a rotation of the fan detected by the rotation number detecting means. Control means for multiplying the number by the number of the blades of the fan and the number of blades of the fan, and outputting a sound having a phase opposite to the wavelength of the cleaning sound collected by the sound collecting means at an integral multiple frequency of the calculation result by the sound generating means; The vacuum cleaner according to claim 1 or 2, further comprising: