JPH057536A - Standing type vacuum cleaner - Google Patents

Abstract

PURPOSE:To provide a stand-type vacuum cleaner that can effectively reduce to a large extent a noise that cannot sufficiently be reduced with prior art. CONSTITUTION:In an exhaust chamber 12 incorporating an electromotive air blower 15 an exhaust duct 13 provided in such a manner that the exhaust duct 13 surrounds the case 11 of the main body. The exhaust chamber 12 and the exhaust duct 13 incorporates an active silenting device comprising a noise detecting microphone 16, a speaker, a monitor and a control circuit 19. An exhaust noise generated by driving the electromotive air blower 15 is given out to the outside of the device from the exhaust duct 13 through the exhaust duct 13. In this process, noise is detected with a noise detecting microphone 16 provided with an exhaust chamber 12 followed by giving out a sound wave having a waveform calculated with the control circuit 19 to provide a phase opposite to the detected sound wave and an identical frequency. Consequently, the two sound waves interfering with each other to largely reduce the sound level from the exhaust port 14 to the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stand type vacuum cleaner, and more particularly to a stand type vacuum cleaner having a function of effectively reducing noise.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, in a vacuum cleaner of this type, an exhaust duct 3 having a dust collection chamber 10 and an electric blower 5 and an exhaust chamber 2 and an exhaust port 4 are provided inside a main body case 1.
Are connected in series, and by driving the electric blower 5,
The air sucked from the suction port 6 together with dust and dust is collected in the dust collection chamber 1
0, the exhaust chamber 2, the exhaust duct 3, and the exhaust port 4 are exhausted to the outside of the machine. In this case, the noise caused by the air flow in the electric blower 5 and the main body is attenuated while passing through the exhaust duct 3, thereby reducing the noise during exhaust.

[0003]

In the conventional vacuum cleaner as described above, the exhaust duct 3 has a relatively short overall length and a small area for attaching the sound absorbing material, and the sound absorbing material absorbs noise.
Alternatively, it is the actual situation that the noise cannot be effectively reduced by the attenuation of the distance from the noise source to the exhaust port. Therefore, an object of the present invention is to provide a stand type vacuum cleaner having a function capable of effectively reducing noise.

[0004]

In order to achieve the above-mentioned object, the main means adopted by the present invention is the gist of the present invention. However, by driving an electric blower housed in the exhaust path, dust and dust are removed. In a stand-type cleaner that discharges sucked air to the outside of the machine through a dust collection chamber, an exhaust path, and an exhaust port, the exhaust path is extended so as to surround the periphery of the cleaner body, and along the exhaust path. A sound detecting means for detecting a sound generated by driving the electric blower, and a sound generating means for generating a sound having a waveform that cancels this sound by interfering with the sound detected by the sound detecting means. It is a stand type vacuum cleaner according to the point in which the.

[0005]

In general, noise in the exhaust passage propagates through the exhaust passage and is radiated from the exhaust port to the outside. However,
In the stand type vacuum cleaner according to the present invention, the sound generated by driving the electric blower is detected by the sound detecting means, and the sound has a reverse phase and same amplitude that cancels the sound by interfering with the detected sound. The sound of the waveform is emitted from the sounding means. As a result, both sound waves interfere with each other, and the level of noise radiated from the exhaust port to the outside is significantly reduced.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the accompanying drawings for the understanding of the present invention. The following embodiments are examples of embodying the present invention and are not of the nature to limit the technical scope of the present invention. 1 is a side view showing a schematic structure of a stand type vacuum cleaner according to an embodiment of the present invention, and FIG. 2 is a front view showing a schematic structure of the stand type vacuum cleaner. In the stand type vacuum cleaner according to this embodiment, as shown in FIGS.
In a substantially cylindrical main body case 11 provided with 1, a dust collection chamber 20 accommodating a paper pack 22 for dust collection, an exhaust chamber 12 containing an electric blower 15, and an exhaust duct 1 having an exhaust port 14
3 are arranged in a row. Then, by driving the electric blower 15, the suction port 2 equipped with the power brush 23
Air sucked together with dust from the suction hose 2
5, it is discharged to the outside of the machine through the dust collection chamber 20, the exhaust chamber 12, the exhaust duct 13, and the exhaust port 14. In the figure, 26
Is an operation unit equipped with various switches. The exhaust duct 13 is extended so as to surround the main body case 11 and prevents howling between a noise detection microphone 16 (sound detecting means) and a speaker 17, which will be described later, and a calculation speed in the control circuit 19. The required overall length dimension can be sufficiently ensured in a compact form that looks good. Further, in this case, since the exhaust duct 13 is extended so as to surround the vertically long tubular main body case 11 so as to surround it, as shown in FIG. It is possible to increase the overall length as a straight line, and it is possible to prevent the occurrence of a turbulent air flow state in the exhaust duct 13 as much as possible, and to avoid problems as much as possible. This makes it possible to more effectively reduce noise, which will be described later.
The noise detection microphone 16 is the electric blower 15
Is for detecting the sound generated by driving the engine, and is provided in the exhaust chamber 12 or the exhaust duct 1.
It is installed near the entrance of No. 3. The speaker 17 is for generating a sound that cancels the sound generated when the electric blower 15 is driven, and is installed near the exhaust port 14. In this case, the sound emitted from the speaker 17 corresponds to a sound having a waveform with the opposite phase and the same amplitude that cancels this sound by interfering with the sound detected by the noise detection microphone 16. Then, this waveform is calculated by the control circuit 19 installed inside the upper surface of the main body case 11, for example.

By the speaker 17 and the control circuit 19,
A sounding unit is configured to generate a sound having a waveform that cancels this sound by interfering with the sound detected by the noise detection microphone 16. Further, in the vacuum cleaner according to the present embodiment, the monitor microphone 18 connected to the control circuit 19 is installed near the exhaust port 14. In the vacuum cleaner configured as described above, the noise (mainly exhaust noise and noise caused by the rotation of the fan) generated by driving the electric blower 15 is
2 propagates inside the exhaust duct 13 and is radiated to the outside from the exhaust port 14. At this time, the noise detection microphone 1
At 6, a sound wave near the sound source is detected. When the sound wave reaches the position of the speaker 17 in the exhaust duct 13, the sound wave is emitted from the speaker 17 so as to have a phase opposite to that of the sound wave and have the same sound pressure. Then, the two sound waves interfere with each other, and only the sound waves whose sound pressure is significantly reduced are radiated to the outside from the exhaust port 14. At this time, the monitor microphone 18 monitors the reduction amount of the sound pressure after the muffling, and the result is fed back to the control circuit 19. As a result, the output signal to the speaker 17 is adjusted so that the silencing effect is maximized. Also,
In the stand type vacuum cleaner according to the present embodiment, since the total size of the exhaust duct 13 can be increased as described above, it is possible to increase the attachment area of the sound absorbing material, which results in noise absorption and exhaust from the noise source. Noise reduction due to distance attenuation up to the mouth 14 is also effectively performed. Here,
The noise frequency f having a reducing effect by the above configuration is expressed by the following equation (1) with respect to the minor axis D of the exhaust duct 13. f <C / 2D (Hz) (1) C: sound velocity (m / s) D: short diameter of exhaust duct (m) From the above formula (1), it is effective for frequencies below a predetermined limit frequency range. It is clear that there is. Therefore, it is possible to obtain a great silencing effect even in the low-frequency region, which is said to be unable to muffel enough in the conventional stand-type vacuum cleaner.

[0008]

Since the stand type vacuum cleaner according to the present invention is configured as described above, the effect of reducing noise is insufficient in the conventional stand type vacuum cleaner, but a significant reduction effect is obtained. It is possible to achieve the above, and it is possible to clean without worrying about the surroundings even in the early morning or late at night.

[Brief description of drawings]

FIG. 1 is a side view showing a schematic structure of a stand type vacuum cleaner according to an embodiment of the present invention.

FIG. 2 is a front view showing a schematic structure of the stand type vacuum cleaner.

FIG. 3 is a side view showing a schematic structure of a conventional stand type vacuum cleaner.

[Explanation of symbols]

 11 ... Main body case 12 ... Exhaust chamber 13 ... Exhaust duct 14 ... Exhaust port 15 ... Electric blower 16 ... Noise detection microphone (sound detection means) 17 ... Speaker 18 ... Monitor microphone 19 ... Control circuit 20 ... Dust collection chamber

Claims (1)

Claims: 1. A stand that discharges dust and air sucked together with dust by driving an electric blower housed in the exhaust passage to the outside of the machine through a dust collection chamber, an exhaust passage, and an exhaust port. In a type vacuum cleaner, the exhaust path is extended so as to surround the main body of the vacuum cleaner, and a sound detecting means for detecting a sound generated by driving the electric blower along the exhaust path; A stand-type vacuum cleaner, comprising: a sounding unit that generates a sound having a waveform that cancels this sound by interfering with the sound detected by the sound detecting unit.