CN110706684A - Device and method for reducing the acoustic power of an acoustic source - Google Patents

Device and method for reducing the acoustic power of an acoustic source Download PDF

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Publication number
CN110706684A
CN110706684A CN201910619021.4A CN201910619021A CN110706684A CN 110706684 A CN110706684 A CN 110706684A CN 201910619021 A CN201910619021 A CN 201910619021A CN 110706684 A CN110706684 A CN 110706684A
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CN
China
Prior art keywords
resonator
fluid channel
acoustic
sound
preparation
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Pending
Application number
CN201910619021.4A
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Chinese (zh)
Inventor
米尔科·肯维奇
阿明·内扎米
科琳娜·米勒
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vorwerk and Co Interholding GmbH
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Vorwerk and Co Interholding GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vorwerk and Co Interholding GmbH filed Critical Vorwerk and Co Interholding GmbH
Publication of CN110706684A publication Critical patent/CN110706684A/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/0081—Means for exhaust-air diffusion; Means for sound or vibration damping
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/161—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general in systems with fluid flow
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A47L9/2805—Parameters or conditions being sensed
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A47L9/2836—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means characterised by the parts which are controlled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F04D29/665—Sound attenuation by means of resonance chambers or interference
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Suction Cleaners (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention relates to a device for reducing the acoustic power of an acoustic source, in particular in the form of a fan or blower of an air cleaner or vacuum cleaner, having at least one fluid channel (2) and having at least one tubular resonator (4). The object of the invention is to provide a device for reducing the sound power of a sound source, which can reduce the sound power in an efficient and space-saving manner, wherein the sound source is in particular formed as a fan or blower of a vacuum cleaner or air cleaner, the solution according to the invention being that the resonator (4) can be fluidically connected to the fluid channel (2) by means of a recess (3) formed on a first end section (7) of the resonator (4), wherein the resonator (4) is closed at a second end section and the resonator (4) reduces the sound power of the sound waves (8) generated by the sound source. The invention also relates to a method for reducing the sound power of a sound source, wherein the sound source is in particular formed as a fan or blower of an air cleaner or vacuum cleaner.

Description

Device and method for reducing the acoustic power of an acoustic source
Technical Field
The invention relates to a device for reducing the acoustic power of an acoustic source, in particular in the form of a fan or blower of an air cleaner or vacuum cleaner, having at least one fluid channel. The invention also relates to a method for reducing the sound power of a sound source, in particular in the form of a fan or blower of a vacuum cleaner or air cleaner, in which method sound waves are generated by the sound source.
Background
Air purifiers are increasingly used in homes and small residential or work areas to clean room air continuously or for a certain period of time. For example, air purification is required and desired in areas where the outside ambient air is heavily polluted or in rooms where the indoor air is partially polluted with toxic substances through tobacco.
Vacuum cleaners are known from the prior art and have a base body in which an electrically driven suction fan motor for creating a suction air flow is arranged.
Fans or blowers are used in air cleaners and suction cleaners to generate an airflow through a fluid passageway that is necessary for the general use of the air cleaner or suction cleaner. In order to produce sufficient air flow for various functions, powerful fans or blowers are required, which however often have increased noise or thus increased acoustic power.
In order to reduce the acoustic power and improve the acoustic effect, it is known in particular to set the fan diameter or the blower diameter larger so that sufficient air flow for various functions can be provided even at lower rotational speeds. However, it is often not sufficient to provide a larger fan or blower, especially due to the limitations of the space provided. Also, providing a larger fan or blower is contrary to the objective of providing a product in as small a size of the apparatus as possible.
It is known in the prior art to use typical sound-damping measures, such as the provision of sound-absorbing foams and deflectors, as a further possibility for reducing the sound power and improving the acoustic effect. However, such an embodiment is detrimental to the efficiency or power of the overall system, since the air flow generated by the fan or blower is likewise choked by the deflector and the foam. In particular, the effective volume flow is thereby reduced.
Disclosure of Invention
The invention is therefore based on the technical problem of providing a method and a device for reducing the acoustic power of a sound source, which is able to reduce the acoustic power in an efficient and as space-saving manner as possible, wherein the sound source is formed in particular as a fan or blower of a vacuum cleaner or air cleaner.
The above object is achieved according to a first teaching of the present invention by a device for reducing the acoustic power of an acoustic source, in particular formed as a fan or blower of an air cleaner or vacuum cleaner, having at least one fluid channel and having at least one tubular resonator, in that the resonator can be fluidically connected to the fluid channel by means of a cutout formed on a first end section of the resonator, the resonator is closed at a second end section and the resonator reduces the acoustic power of the acoustic wave generated by the acoustic source.
Therefore, the resonance principle is used in order to reduce the acoustic power of the sound waves generated by the fan or blower, in particular to reduce the acoustic power of the individual frequencies of the sound waves. In this case, at least a part of the generated acoustic wave is introduced into the resonator and reflected inside the resonator, and thus the acoustic wave flowing into the resonator and the acoustic wave reflected inside the resonator are superimposed to interfere with each other. The structural properties of the resonator are selected such that the acoustic waves add destructively, in particular for specific frequencies or frequency peaks, so that the acoustic waves are reduced. This results in a reduction in the acoustic power of the individual frequencies of the acoustic wave without significantly reducing the effective volumetric flow or airflow of the device.
By reducing the acoustic power of individual frequencies or frequency peaks of the sound waves, the overall acoustic power level of a sound source, for example a fan or blower of a vacuum cleaner or air purifier, is reduced, whereby legal restrictions with regard to acoustic power can be met. The acoustic load perceived by the user can likewise be reduced, since the user usually lists individual frequency peaks, among other things, as disturbing components.
Preferably, the resonator has a diameter smaller than the diameter of the fluid channel. The resonator, which is connected to the fluid channel and is embodied in the form of a cylinder, preferably has two closed circular cross sections, wherein a recess for connecting the resonator to the fluid channel is provided in the outer surface of the first end section of the tubular resonator.
A preferred embodiment of the invention is characterized in that the length of the resonator is substantially equal to a quarter of the wavelength of the acoustic wave to be reduced. The acoustic power of the acoustic waves flowing into the resonator can thereby be reduced in as favorable a manner as possible, since the acoustic waves flowing into the resonator are reflected by the second end section of the resonator, so that the flowing-in and flowing-out acoustic waves add up destructively.
A further preferred embodiment of the invention is characterized in that at least one resonator extends substantially parallel to the longitudinal axis of the fluid channel. Space can be saved by the parallel extension of the resonator and the fluid channel.
Furthermore, it is preferred that the at least one resonator is oriented along or opposite to the flow direction of the fluid channel. The flow direction depicts the direction of the air flow generated by a sound source, such as a fan or blower.
A further preferred embodiment of the invention is characterized in that a plurality of resonators of different lengths are fluidically connected to the fluid channel and the length of the resonators is in each case substantially equal to a quarter of the wavelength of the acoustic wave to be reduced. In this embodiment, a plurality of resonators are provided, the length of which is adapted to the frequency of the sound waves to be reduced. Alternatively, different frequencies or frequency peaks of the sound waves can be generated by different load levels of the sound source. By this embodiment, the reduction of the acoustic power generated by the acoustic wave can be carried out in a user-friendly manner according to the respective power level.
According to a further embodiment of the invention, it is preferred that the resonator is arranged in a holder and that the resonator is arranged substantially circularly around the fluid channel by means of the holder. By means of such an embodiment, a plurality of resonators can be connected with the fluid channel in a structurally simple manner, so that a plurality of frequencies of the sound waves generated by the sound source can be reduced and thus an improved reduction of the overall sound power is brought about. Additionally, such an embodiment is advantageous for a compact type of construction, especially when the respective resonator is preferably oriented parallel to the longitudinal central axis of the fluid channel.
Furthermore, an advantageous reduction of the acoustic power is facilitated when the notches of the resonator are located substantially on the same longitudinal extension of the fluid channel. By longitudinally extending is meant that the indentations are arranged substantially at the same level of the fluid channel.
A further preferred embodiment of the invention is characterized in that the cross section of the at least one resonator and the cross section of the at least one recess are substantially circular. This is advantageous in particular in terms of fluid dynamics.
According to another embodiment of the invention it is preferred that the detection means measures at least one frequency of the sound waves generated by the sound source and that the control means varies the effective length of at least one resonator connected to the fluid channel in dependence on the frequency of the sound waves measured by the detection means. Thereby, the reduction of the acoustic power of the acoustic wave can be adaptively adjusted to adapt to different frequencies. Different sound waves having different frequencies and wavelengths can be generated according to the load state of the sound source, so that the acoustic power of the sound waves generated under different load conditions can be reduced by destructive interference by adjusting the length of the resonator.
According to a further preferred embodiment of the invention, a delimiting element, which is movably supported in the extension direction of the resonator, fluidically closes the second end section, wherein the delimiting element is pushable in the extension direction of the resonator by means of the control device. In this case, the delimiting elements are preferably pushed such that those frequencies of the sound waves induced by the sound source which are perceived by the user of the device as particularly disturbing or loudest are reduced by destructive interference.
A further preferred embodiment of the invention is characterized in that the holder is rotatably supported about the longitudinal axis of the fluid channel and the control means connect different resonators to the fluid channel by rotating the holder in dependence on the frequency of the sound waves measured by the detection means. Thereby, at least one resonator can be connected to the fluid channel, with which the frequencies of the sound waves induced by the sound source that are perceived as particularly disturbing by a user of the device or that are loudest are reduced by means of destructive interference.
The above-mentioned problem is likewise solved according to the second teaching of the present invention by a method for reducing the acoustic power of an acoustic source, wherein the acoustic source is formed in particular as a fan or blower of a vacuum cleaner or air cleaner, wherein an acoustic wave is generated by the acoustic source, in which method at least one part of the acoustic wave flowing through a fluid channel is guided into at least one tubular resonator which is connected to the fluid channel and is closed on one side, in which method the part of the acoustic wave which is guided into the resonator is reflected at the closed end of the resonator and in which method the acoustic power of a part of the acoustic wave is reduced by superposition by means of the resonator.
Advantages with respect to the method have been described with reference to the above-described arrangement according to the invention.
In order to adapt the length of at least one resonator to the frequency of the sound wave emitted by the sound source, it is advantageous to measure at least one frequency of the sound wave and to vary the length of the resonator connected to the fluid channel depending on the at least one measured frequency of the sound wave to be reduced.
A preferred embodiment of the invention is characterized in that the length of the resonator connected to the fluid channel is varied such that the length of the resonator is substantially equal to a quarter of the wavelength of the acoustic wave to be reduced. The advantages in this respect have been elucidated with reference to the device according to the invention.
Drawings
The invention is elucidated on the basis of an embodiment with reference to the drawings. In the attached drawings
Fig. 1 shows a schematic cross-sectional view of a first embodiment of a device according to the invention;
fig. 2 shows a perspective view of a component of a second embodiment of the device according to the invention, comprising a holder with a plurality of resonators.
Detailed description of the preferred embodiments
In the following description of different embodiments according to the invention components and elements having the same function and the same way of functioning are provided with the same reference numerals, even though the size or shape of the components and elements may differ in different embodiments.
Fig. 1 shows a schematic cross-sectional view of a first embodiment of a device according to the invention. The resonator 4 is arranged here parallel to the longitudinal center axis of the fluid channel 2. The resonator is connected hydrodynamically to the fluid channel 2 by means of the gap 6. The recess 6 is essentially circular and opens into a first end section 7 of the resonator 4. The sound waves 8 generated by the sound source, in particular by the blower or fan, generally spread substantially parallel to the fluid channel 2. The course of the sound waves 8 is exemplarily depicted by means of arrows. Diameter d of resonator 4RPreferably smaller than the diameter d of the fluid channel 2S。
At least a part of the sound waves 8 generated by the sound source, in particular by a blower or fan, is directed into the resonator 4. This part of the acoustic wave 8 also extends substantially parallel to the longitudinal central axis of the fluid channel 2 or parallel to the longitudinal central axis of the resonator 4. Accordingly, the part of the acoustic wave 8 which is guided into the resonator 4 is reflected by the inner wall 10 of the resonator 4 which axially delimits the tubular shape and then extends in the opposite direction also substantially parallel to the longitudinal central axis of the fluid channel 2 or to the longitudinal central axis of the resonator 4. The length l of the resonator 4 is in this caseRCorresponding substantially to a quarter of the wavelength of the frequency to be reduced of the sound waves 8.
Due to the destructive interference between the sound waves 8 entering the resonator 4 and the sound waves 8 reflected by the resonator 4, the sound power of the sound waves 8 at the frequency to be reduced is reduced. The reduced frequencies of the sound waves 8 are preferably understood to be those frequencies or frequency peaks which are perceived as particularly disturbing by a user of the device, in particular a user of a vacuum cleaner or air purifier. Thus, the acoustic power perceived by the user is reduced.
Furthermore, in order to reduce other frequencies generated by the acoustic source, it is preferable that a plurality of resonators 4 are arranged in a left-wheel manner around the fluid passage 2. This is shown in fig. 2.
For this purpose, the resonator 4 is held in a holder 12. The holder 12 is circular in shape and has a recess 14 in its center, which is likewise circular in shape. The fluid channel 2 can be arranged in a recess 14 embodied as a circle. The resonator 4 has a preferably circular recess 6 at its outer surface facing the recess 14 embodied as a circle. The notches 6 are used to connect the respective resonators 4 with the fluid channel 2. For this purpose, a support 12 is arranged around the fluid channel 2. The fluid channel 2 likewise has openings coinciding with the indentations 6, by means of which the individual resonators 4 can be connected with the fluid channel 2.
The resonators 4 have different lengths, so that different frequencies of the acoustic wave 8 can be reduced by means of the depicted resonators 4. Thus, a plurality of resonators 4 are connected to the fluid channel 2, the resonators serving to reduce the acoustic power generated by the acoustic source, thereby reducing the overall acoustic power perceived by a user of the device.
Three resonators 4 are exemplarily depicted in fig. 2. The resonators are embodied substantially parallel to each other and to the fluid channel 2 which can be connected to the holder 12. Other numbers of resonators 4 may also be arranged on the support 12.
The invention is not limited to the embodiments depicted. The previously described detection means as well as the previously described control means can also be provided. In particular, it is likewise conceivable to connect a resonator 4 having an inner wall 10 which is supported so as to be movable in the axial direction to the fluid channel 2. Thus, the particular frequency at which the acoustic waves 8 are reduced can also be set in an efficient manner.

Claims (14)

1. A device for reducing the sound power of a sound source, in particular formed as a fan or blower of an air cleaner or vacuum cleaner,
-has at least one fluid channel (2) and
-a resonator (4) having at least one tubular shape,
-wherein a resonator (4) can be hydrodynamically connected with the fluid channel (2) by means of a gap (3) formed on a first end section (7) of the resonator (4),
-wherein the resonator (4) is closed at the second end section and
-wherein the resonator (4) reduces the acoustic power of an acoustic wave (8) generated by the acoustic source.
2. The apparatus of claim 1, wherein the first and second electrodes are disposed on opposite sides of the housing,
it is characterized in that the preparation method is characterized in that,
the length of the resonator (4) is substantially equal to a quarter of the wavelength of the acoustic wave (8) to be reduced.
3. The apparatus of claim 1 or 2,
it is characterized in that the preparation method is characterized in that,
at least one of the resonators (4) extends substantially parallel to the longitudinal axis of the fluid channel (2).
4. The device according to any one of claims 1 to 3,
it is characterized in that the preparation method is characterized in that,
at least one of the resonators (4) is oriented along or opposite to the flow direction of the fluid channel (2).
5. The device of any one of claims 1 to 4,
it is characterized in that the preparation method is characterized in that,
-a plurality of resonators (4) of different lengths are hydrodynamically connected with the fluid channel (2) and
-the length of the resonators (4) is respectively substantially equal to a quarter of the wavelength of the acoustic wave (8) to be reduced.
6. The apparatus of claim 5, wherein the first and second electrodes are disposed in a common plane,
it is characterized in that the preparation method is characterized in that,
-the resonator (4) is arranged in a support (12) and
-the resonator (4) is arranged substantially circularly around the fluid channel (2) by means of the holder (12).
7. The apparatus of claim 5 or 6,
it is characterized in that the preparation method is characterized in that,
the notches (3) of the resonator (4) are located substantially on the same longitudinal extension of the fluid channel (2).
8. The device of any one of claims 1 to 7,
it is characterized in that the preparation method is characterized in that,
the cross section of at least one resonator (4) and the cross section of at least one recess (3) are substantially circular.
9. The device of any one of claims 1 to 8,
it is characterized in that the preparation method is characterized in that,
-a detection device measures at least one frequency of the sound waves (8) generated by the sound source and
-control means vary the effective length of at least one resonator (4) connected to said fluid channel (2) according to said frequency of said acoustic wave (8) measured by said detection means.
10. The apparatus of claim 9, wherein the first and second electrodes are disposed on opposite sides of the substrate,
it is characterized in that the preparation method is characterized in that,
-a delimiting element movably supported in the extension direction of the resonator (4) hydrodynamically encloses the second end section and
-the limiting element is pushable in the extension direction of the resonator (4) by means of the control device.
11. The apparatus of claim 6 and claim 9,
it is characterized in that the preparation method is characterized in that,
-the holder (12) is rotatably supported about a longitudinal axis of the fluid channel (2) and
-said control means connect different resonators (4) to said fluid channel (2) by rotating said support (12) according to the frequency of said acoustic wave (8) measured by said detection means.
12. Method for reducing the sound power of a sound source, in particular formed as a fan or blower of a vacuum cleaner or air purifier,
-in the method, sound waves are generated by the sound source,
in the method, at least a part of the acoustic waves flowing through the fluid channel is guided into at least one tubular, single-sided closed resonator connected to the fluid channel,
in the method, the part of the sound wave directed into the resonator is reflected at the closed end of the resonator and
-in the method, the acoustic power of at least a part of the acoustic waves is reduced by superposition by means of the resonator.
13. The method of claim 12, wherein the first and second light sources are selected from the group consisting of,
-in the method, at least one frequency of the sound wave is measured and
-in the method, the length of the resonator connected to the fluid channel is changed according to at least one measured frequency of the acoustic wave to be reduced.
14. The method according to claim 12 or 13,
in the method, the length of the resonator connected to the fluid channel is varied such that the length of the resonator is substantially equal to a quarter of the wavelength of the acoustic wave to be reduced.
CN201910619021.4A 2018-07-10 2019-07-10 Device and method for reducing the acoustic power of an acoustic source Pending CN110706684A (en)

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DE102018116681.8A DE102018116681A1 (en) 2018-07-10 2018-07-10 Device and method for reducing the sound power of a sound source
DE102018116681.8 2018-07-10

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Cited By (1)

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CN114576661A (en) * 2020-11-30 2022-06-03 广东美的白色家电技术创新中心有限公司 Smoke machine

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US11713904B2 (en) * 2019-10-01 2023-08-01 Johnson Controls Tyco IP Holdings LLP Tunable sound attenuating modules

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US2075263A (en) * 1931-10-19 1937-03-30 Maxim Silencer Co Sound attenuating device
JPH0630860A (en) * 1992-06-26 1994-02-08 Tokyo Electric Co Ltd Vacuum cleaner
DE19964089A1 (en) * 1999-12-29 2001-07-12 Ralph Knaack Vehicle engine exhaust silencer uses three disk proportionating damper valve wheel whose center disk pivots via threaded rod round axis to vary upward and downward decibel emission levels via outside disk holes.
US20040069563A1 (en) * 2001-01-18 2004-04-15 Thomas Zirkelbach Silencer with a plurality of resonance chambers
US20180042438A1 (en) * 2014-12-26 2018-02-15 Samsung Electronics Co., Ltd. VACUUM CLEANER AND CONTROL METHOD FOR THE SAME (as amended)

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2075263A (en) * 1931-10-19 1937-03-30 Maxim Silencer Co Sound attenuating device
JPH0630860A (en) * 1992-06-26 1994-02-08 Tokyo Electric Co Ltd Vacuum cleaner
DE19964089A1 (en) * 1999-12-29 2001-07-12 Ralph Knaack Vehicle engine exhaust silencer uses three disk proportionating damper valve wheel whose center disk pivots via threaded rod round axis to vary upward and downward decibel emission levels via outside disk holes.
US20040069563A1 (en) * 2001-01-18 2004-04-15 Thomas Zirkelbach Silencer with a plurality of resonance chambers
US20180042438A1 (en) * 2014-12-26 2018-02-15 Samsung Electronics Co., Ltd. VACUUM CLEANER AND CONTROL METHOD FOR THE SAME (as amended)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114576661A (en) * 2020-11-30 2022-06-03 广东美的白色家电技术创新中心有限公司 Smoke machine

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