WO2022261990A1 - Appareils et procédés d'affaiblissement acoustique - Google Patents

Appareils et procédés d'affaiblissement acoustique Download PDF

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Publication number
WO2022261990A1
WO2022261990A1 PCT/CN2021/101092 CN2021101092W WO2022261990A1 WO 2022261990 A1 WO2022261990 A1 WO 2022261990A1 CN 2021101092 W CN2021101092 W CN 2021101092W WO 2022261990 A1 WO2022261990 A1 WO 2022261990A1
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WIPO (PCT)
Prior art keywords
airflow
resonance chamber
side wall
sound
airflow channel
Prior art date
Application number
PCT/CN2021/101092
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English (en)
Inventor
Lingdong GU
Original Assignee
Sz Zuvi Technology Co., Ltd.
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 Sz Zuvi Technology Co., Ltd. filed Critical Sz Zuvi Technology Co., Ltd.
Priority to PCT/CN2021/101092 priority Critical patent/WO2022261990A1/fr
Publication of WO2022261990A1 publication Critical patent/WO2022261990A1/fr

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    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D20/00—Hair drying devices; Accessories therefor
    • A45D20/04—Hot-air producers
    • A45D20/08—Hot-air producers heated electrically
    • A45D20/10—Hand-held drying devices, e.g. air douches
    • A45D20/12—Details thereof or accessories therefor, e.g. nozzles, stands

Definitions

  • the airflow generating element includes a motor and an impeller, a rotor of the motor is configured to rotate around a rotation axis of the motor, and the impeller is operably coupled to the rotor so as to effect the airflow in the airflow channel when the rotor rotates.
  • the resonance chamber is disposed in the main portion of the housing.
  • the fixing member is formed integral with at least a portion of the resonance chamber.
  • the sound reducing element further includes one or more sound absorbing components disposed in a bore of the resonance chamber.
  • a diameter of each of the plurality of pores in the side wall is smaller than 1 centimeter.
  • the at least one radiation energy source is arranged in a plane perpendicular to the axis of the airflow channel and along a periphery of the airflow channel.
  • a method for generating an airflow may comprise providing an airflow channel and a resonance chamber.
  • the resonance chamber may be disposed in the airflow channel and configured to reduce sound that is caused by the airflow in the airflow channel.
  • the resonance chamber may include a side wall extending along an axis of the airflow channel, and a plurality of pores in at least a portion of the side wall, the plurality of pores being configured to allow at least a portion of the airflow in the airflow channel to traverse the side wall.
  • the method may also comprise effecting, through an airflow generating element, the airflow through the airflow channel.
  • a sound reducing device may comprise a resonance chamber disposed in an airflow channel in which an airflow flows and configured to reduce sound that is caused by the airflow.
  • the resonance chamber may include a side wall extending along an axis of the airflow channel, and a plurality of pores in at least a portion of the side wall. The plurality of pores may be configured to allow at least a portion of the airflow in the airflow channel to traverse the side wall.
  • FIG. 5B is an oblique view of a cross section of the sound reducing element as illustrated in FIG. 5A according to some embodiments of the present disclosure
  • FIG. 5C is an oblique view of a cross section of another sound reducing element according to some embodiments of the present disclosure.
  • FIGs. 8A-8D illustrate exemplary sound absorption curves of sound reducing elements of different configurations according to some embodiments of the present disclosure
  • FIG. 11 is a flowchart illustrating an exemplary process for drying an object according to some embodiments of the present disclosure.
  • the airflow through the airflow channel 120 may be effected or generated by an airflow generating element (not shown) .
  • the airflow generating element may be disposed within or out of the airflow channel 120.
  • the airflow generating element may include a motor and an impeller.
  • the motor may include a rotor.
  • the rotor may be configured to rotate around a rotation axis of the motor. When electric power is supplied to the motor, the rotor may be driven to rotate by the electric power.
  • the impeller may be operably coupled to the rotor.
  • the impeller may be fixedly connected to the rotor through, e.g., a threaded connection. The impeller may rotate along with the rotor to effect the airflow in the airflow channel 120.
  • the sound reducing element 110 may include a resonance chamber 111.
  • the resonance chamber 111 may be disposed in the airflow channel 120 to reduce or eliminate at least a portion of the sound (e.g., the noise) in the airflow channel 120.
  • the resonance chamber 111 may be a chamber having a shape of a cylinder, a barrel, a cone, a frustum of a cone, a sphere, a spheroidicity, or the like, or any other structures of regular or irregular shapes.
  • the resonance chamber 111 may include a side wall 112.
  • the side wall 112 may have a closed cross-section perpendicular to an axis (along the Z direction as illustrated in FIG. 1) of the airflow channel 120.
  • the side wall 112 may extend along the axis of the airflow channel 120.
  • a bore (e.g., an internal space) of the resonance chamber 111 may be enclosed in the side wall 112.
  • the resonance chamber 111 may include one or more openings.
  • the one or more openings may be disposed in at least a portion of the side wall 112.
  • a fluid communication between the bore of the resonance chamber 111 and the airflow channel 120 may be established through the one or more openings.
  • the one or more openings may include pores, slits, or the like, or any combination thereof.
  • the preset condition may relate to a uniformity degree of the width 115 of the passage along the circumferential direction.
  • the uniformity degree of the width 115 may be defined by a maximum difference between width values at different positions of the passage along the circumferential direction. The maximum difference may be 0.1 millimeters, 0.2 millimeters, 0.5 millimeters, 1 millimeter, 1.5 millimeters, 1.8 millimeters, etc.
  • the resonance chamber 111 may be disposed at a central portion of the airflow channel 120.
  • a coordinate system 130 is provided in FIG. 1.
  • the coordinate system 130 may include an X-axis, a Y-axis (not shown) , and a Z-axis.
  • the positive X direction along the X-axis may be from the lower part to the upper part of the airflow apparatus 100; the positive Y direction along the Y-axis may be from the left side to the right side of the airflow apparatus 100 viewed from the direction facing the airflow inlet 121; the positive Z direction along the Z-axis may be from the airflow inlet 121 to the airflow outlet 122 (i.e., a direction of the airflow in the airflow channel 120) .
  • the central portion of the airflow channel 120 herein refers to a portion of the airflow channel 120 that is within a circular range from an axis of the airflow channel 120.
  • the axis of the airflow channel 120 may be parallel to the Z direction of the coordinate system 130.
  • the circular range may be, e.g., 5 centimeters, 10 centimeters, 15 centimeters, 20 centimeters, etc.
  • the axis of the resonance chamber 111 may substantially coincide with the axis of the airflow channel 120 (i.e., the resonance chamber 111 may be disposed substantially coaxially with the airflow channel 120) .
  • the resonance chamber 111 may resonate with sound of a specific frequency range in the resonance chamber 111.
  • the specific frequency range may be equal to or close to a resonance frequency of the resonance chamber 111.
  • the resonance frequency of the resonance chamber 111 may be determined according to Equation (1) :
  • f 0 denotes the resonance frequency of the resonance chamber 111
  • k denotes an elastic coefficient of the resonance chamber 111
  • m denotes the mass of the resonance chamber 111.
  • the elastic coefficient k of the resonance chamber 111 may relate to a thickness of the side wall 112 of the resonance chamber 111, a length of the resonance chamber 111, the material of the resonance chamber 111, etc.
  • the length of the resonance chamber 111 refers to a maximum length of the resonance chamber 111 along the axis of the airflow channel 120.
  • the specific frequency range may be, e.g., 480-520 Hz, 1480-1520 Hz, 2480-2520 Hz, 3480-3520 Hz, 4480-4520 Hz, 5480-5520 Hz, 6480-6520 Hz, 7480-7520 Hz, 8480-8520 Hz, 9480-9520 Hz, etc.
  • air in the bore of the resonance chamber 111 may vibrate, and internal friction caused by the vibration of the air may consume energy of the sound of the specific frequency range, such that an amplitude of the sound of the specific frequency range may be reduced effectively.
  • the at least one feature of the one or more openings may include, for example, a number or count of the one or more openings, a characteristic dimension of each of the one or more openings, a porosity of the side wall 112, etc.
  • a characteristic dimension of an opening refers to a diameter of a circumcircle of the opening.
  • a characteristic dimension of an oval-shaped opening may be a length of a major axis of the oval-shaped opening.
  • a characteristic dimension of a rectangular opening may be a length of a diagonal of the rectangular opening.
  • the electrically insulating material may include polyvinyl chloride (PVC) , polyethylene terephthalate (PET) , acrylonitrile-butadiene-styrene copolymer (ABS) , polyester, polyolefins, polystyrene, polyurethane, thermoplastic, silicone, glass, fiberglass, resin, rubber, ceramic, nylon, and wood.
  • the housing 210 may also be made from a metallic material coated with an electrically insulating material or a combination of an electrically insulating material and metallic material coated or not coated with an electrically insulating material.
  • the electrically insulating material may form an inner layer of the housing 210, while the metallic material may form an outer layer of the housing 210.
  • the housing 210 may include a main portion 211 and an auxiliary portion 212.
  • the auxiliary portion 212 may be connected with the main portion 211.
  • a length direction of the main portion 211 may intersect with a length direction of the auxiliary portion 212.
  • the length direction of the main portion 211 may be along the Z axis of a coordinate system 280, which is the same as or similar to the coordinate system 130.
  • the length direction of the auxiliary portion 212 may be along the X axis of the coordinate system 280.
  • the length direction of the main portion 211 may be substantially perpendicular to the length direction of the auxiliary portion 212.
  • the angle between the length direction of the main portion 211 and the length direction of the auxiliary portion 212 may be adjustable. In some embodiments, the angle between the length direction of the main portion 211 and the length direction of the auxiliary portion 212 may be adjusted within a range, e.g., between 0° and 90°, or between 10° and 90°, or between 0° and 180°. For instance, the auxiliary portion 212 may fold with respect to the main portion 211 such that the angle between the length direction of the main portion 211 and the length direction of the auxiliary portion 212 changes to 0°. As for a hair dryer, the main portion 211 may be a body of the hair dryer, while the auxiliary portion 212 may be a handle of the hair dryer.
  • the airflow generating element 230 may be arranged in the airflow channel 220 (i.e., the airflow generating element 230 may be disposed in the main portion 211) .
  • the airflow generating element 230 may be fixed in the airflow channel 220 by a holder or a shroud.
  • a diameter of the airflow channel 220 in the main portion 211 may be larger than or equal to an outer diameter of the airflow generating element 230.
  • the diameter of the airflow channel 220 refers to a diameter of an inner wall of the airflow channel 220.
  • a diameter of the impeller 232 may be larger than a diameter of a shell of the motor 231.
  • the outer diameter of the airflow generating element 230 may be a diameter of the impeller 232.
  • the radiation emitting member 251 may be located offset the focal point of the parabola, such that the reflected beam of radiation may be convergent or divergent at a distance in front of the drying apparatus 200.
  • a position of the radiation emitting member 251 in the radiation energy reflecting member 252 may be adjustable. Therefore, a degree of convergence and/or a direction of the reflected beam of radiation may be changed accordingly.
  • the shape of the radiation energy reflecting member 252 and/or the shape of the radiation emitting member 251 may be optimized or varied with respective to each other for desired heating power output at a desired position exterior to the drying apparatus 200.
  • the inner surface of the radiation energy reflecting member 252 may be coated with a coating material having a high reflectivity to a wavelength or a range of wavelength of the radiation emitted by the radiation emitting member 251.
  • the coating material may have a high reflectivity to a wavelength in both the visible spectrum and the infrared spectrum.
  • a material having a high reflectivity may have a high effectiveness in reflecting radiation energy.
  • Exemplary coating materials may include metallic materials, dielectric materials, etc.
  • the metallic materials may include, for example, gold, silver, aluminum, or the like.
  • the coating material may have multiple layers of alternating dielectric materials, such as magnesium fluoride, calcium fluoride, etc.
  • the drying apparatus 200 may also include one or more air filters (not shown) .
  • the one or more air filters may be configured to prevent impurities (e.g., dust, hair, a foreign gas, etc. ) from entering the airflow channel 220.
  • the one or more air filters may include meshes, absorbing layers (e.g., foam, activated carbon, etc. ) , or the like, or a combination thereof.
  • the one or more air filters may be disposed at preset positions (e.g., the airflow inlet 221 and/or the airflow outlet 222) in the airflow channel 220.
  • the one or more air filters may be detachably mounted at the preset positions for the convenience of cleaning and/or maintenance of the airflow apparatus 100.
  • the drying apparatus 200 may further include an airflow regulator (not shown) .
  • the airflow regulator may be disposed at the airflow outlet 222.
  • the airflow regulator may modulate at least one of a velocity, a throughput, an angle of divergence, or a vorticity of the airflow blowing out of the airflow channel 220.
  • the airflow regulator may be shaped to converge (e.g., concentrate) the airflow at a predetermined position in front of the drying apparatus 200.
  • the airflow regulator may be shaped to diffuse the airflow exiting the airflow outlet 222.
  • the airflow regulator may be a nozzle, a comb, a curler, etc.
  • FIG. 3 is a schematic diagram illustrating an exemplary arrangement of an airflow generating element and a sound reducing element that is located in an airflow channel in a main portion of a housing according to some embodiments of the present disclosure.
  • the airflow generating element 310 and the sound reducing element 320 may be disposed in an airflow channel 330.
  • the entire airflow channel 330 may be disposed in a main portion of a housing (e.g., the main portion 211 of the housing 210 as illustrate in FIG. 2) .
  • the airflow generating element 310 may include a motor 311 and an impeller 312.
  • the impeller 312 may rotate around a rotation axis of the motor 311 to generate an airflow in the airflow channel 330.
  • the motor 311 and the impeller 312 may be similar to or the same as the motor 231 and the impeller 232 of the airflow generating element 230 as illustrated in FIG. 2, the descriptions of which are not repeated here.
  • the axis of the motor 311 may be a geometric center line of the motor 311. In some embodiments, the axis of the motor 311 may substantially coincide with a rotation axis of the motor 311. As set forth above, in some embodiments, the resonance chamber 321 may also be disposed substantially coaxially with the airflow channel 330. In this case, the resonance chamber 321 may be disposed substantially coaxially with the motor 311 of the airflow generating element 310.
  • the two end walls 323 and 324 of the barrel-shaped structure may be substantially perpendicular to the axis of the airflow channel 330.
  • One of the two end walls (e.g., the end wall 324) may face the motor 311.
  • a characteristic dimension of the end wall 324 may be equal to or smaller than a diameter of the motor 311.
  • the characteristic dimension of the end wall 324 may be a diameter of a circumcircle of the end wall 324.
  • the characteristic dimension of the oval-shaped end wall 324 may be a length of a major axis of the oval-shaped end wall 324.
  • the characteristic dimension of the rectangular end wall 324 may be a length of a diagonal of the rectangular end wall 324.
  • a low-velocity region 410 is denoted by a circle at the airflow outlet 400.
  • the low-velocity region refers to a region in which a velocity of the airflow at each position in the region is below a threshold velocity.
  • the threshold velocity may be, for example, 20 m/s, 22 m/s, 24 m/s, 26m/s, 28 m/s, 30 m/s, 32 m/s, 34 m/s, 36 m/s, etc.
  • a low-velocity region 460 is denoted by a circle at the airflow outlet 450.
  • the count or number of the plurality of pores 514, the shape of each of the plurality of pores 514, the pore diameter of the side wall 511, the porosity of the side wall 511, the distribution of the plurality of pores in the side wall 511, and/or the direction of each of the plurality of pores 514 may be determined according to the target frequency range of sound to be reduced.
  • a thickness of the entire side wall 511 may be in a constant. In some embodiments, a thickness of the side wall 511 may vary at different positions of the side wall 511. For example, the thickness of the side wall 511 may decrease along the positive Z direction. In some embodiments, a thickness of at least a portion of the side wall 511 may be in a thickness range. The thickness range may be, for example, below 1 centimeter, 500-800 millimeters, 100-500 millimeters, 10-100 millimeters, 5-10 millimeters, 0.1-5 millimeters, 0.1-1 millimeters, 0.1-0.5 millimeters, etc.
  • the resonance chamber 510 may be attached to an airflow apparatus (e.g., a hair dryer, an air conditioner, a specialty gas supplier, a vacuum blower, a dust collector, a ventilator, etc. ) through the fixing member 520.
  • the fixing member 520 may connect the side wall 511 of the resonance chamber 510 to a portion of the airflow apparatus (e.g., an inner surface of an airflow channel of the airflow apparatus) .
  • the fixing member 520 may be arranged between the side wall 511 and the portion of the airflow apparatus.
  • the fixing member 520 may extend along the axis 515 of the resonant chamber 510. An airflow in the airflow channel of the airflow apparatus may be guided to flow over the side wall 511.
  • the at least one connecting structure may include multiple bolt holes 523 that facilitate a bolted joint between the sound reducing element 500 and the portion of the airflow apparatus.
  • the portion of the airflow apparatus may also include at least one similar connecting structure (e.g., multiple bolt holes) that matches the at least one connecting structure so as to facilitate the joint between the sound reducing element 500 and the portion of the airflow apparatus.
  • the sound reducing element 500 may be manufactured and installed in an existing airflow apparatus as an independent device.
  • the sound reducing element 500 may also be referred to as a sound reducing device.
  • a bore 553 of the resonance chamber 552 may be formed by an inner surface of a side wall of the resonance chamber 552 and an outer surface of the columnar unit 574.
  • the resonance chamber 552 may include a plurality of pores in at least a portion of the side wall.
  • the columnar unit 574 may be detachably connected to the end wall 558 of the resonance chamber 552.
  • the columnar unit 574 may be detachably connected to the end wall 558 through a detachable joint 578.
  • Examples of the detachable joint 578 may include a threaded joint, a snap-fit joint, an interference-fit joint, or the like. In this way, columnar units of various sizes may be used so as to change a volume of the bore 553 of the resonance chamber 552, thereby changing the target frequency range for sound reduction by the sound reducing element 550.
  • the columnar unit 574 in combination with the detachable joint 578 may be replaceable as an integral piece.
  • the columnar unit 574 may be installed onto or removed from the sound reducing element 550 together with the detachable joint 578 as an integral piece.
  • the fixing member 562 may be similar to or the same as the fixing member 520 as illustrated in FIGs. 5A and 5B, the descriptions of which are not repeated here.
  • FIG. 6 shows a theoretical sound absorption curve of a sound reducing element according to some embodiments of the present disclosure.
  • the theoretical sound absorption curve of the sound reducing element shows theoretically estimated sound absorption coefficients of the sound reducing element at different frequencies.
  • the sound absorption coefficient may range from 0 to 1.
  • a sound absorption coefficient having a value of 1 represents that the sound reducing element absorbs one hundred percent of the sound;
  • a sound absorption coefficient having a value of 0 represents that the sound reducing element absorbs zero percent of the sound, and all of the sound are reflected by the sound reducing element.
  • the horizontal axis of the theoretical sound absorption curve represents the frequencies of sound.
  • the vertical axis of the theoretical sound absorption curve represents the sound absorbing coefficients.
  • the target frequency range for sound reduction is in a range of 5,000-9,000 Hz.
  • the sound reducing element has a better sound absorbing effect (e.g., the sound absorption coefficient is larger than or equal to 0.75) in the target frequency range.
  • Almost one hundred percent of sound having a frequency of 7,000 Hz is absorbed by the sound reducing element since the resonance chamber of the sound reducing element resonates with the sound at the frequency of 7,000 Hz.
  • the frequency of 7,000 Hz is also referred to as a central frequency of the target frequency range.
  • the sound reducing elements of different configurations may be grouped into multiple sets. Sound reducing elements in each of the multiple sets may be the same except for a single feature.
  • the single feature may be determined as a variable for the set of sound reducing elements. A relationship between the single feature and the target frequency range for sound reduction may be obtained from sound absorption curves of the set of sound reducing elements.
  • FIG. 8A illustrates exemplary sound absorption curves of a first set of sound reducing elements according to some embodiments of the present disclosure.
  • Sound reducing elements in the first set (also referred to as first sound reducing elements for simplicity) are the same except that a pore diameter of the side wall of each first sound reducing element is different from each other.
  • a thickness of the side wall, a porosity of the side wall, and a length of the resonance chamber along its axis of each first sound reducing element are 0.5 millimeters, 5 percent, and 3.5 millimeters, respectively.
  • a sound absorption curve 811 represents sound absorption coefficients of a first sound reducing element with a pore diameter of 0.1 millimeters at different frequencies.
  • a sound absorption curve 812 represents sound absorption coefficients of a first sound reducing element with a pore diameter of 0.2 millimeters at different frequencies.
  • a sound absorption curve 813 represents sound absorption coefficients of a first sound reducing element with a pore diameter of 0.3 millimeters at different frequencies.
  • a sound absorption curve 814 represents sound absorption coefficients of a first sound reducing element with a pore diameter of 0.4 millimeters at different frequencies.
  • the target frequency range becomes smaller and the sound absorption coefficient decreases.
  • the first sound reducing element with the pore diameter of 0.2 millimeters has a better sound reducing effect in a target frequency range of 5,000-9,000 Hz than the other sound reducing elements examined in this group.
  • FIG. 8B illustrates exemplary sound absorption curves of a second set of sound reducing elements according to some embodiments of the present disclosure.
  • Sound reducing elements in the second set (also referred to as second sound reducing elements for simplicity) are the same except that a porosity of the side wall of each second sound reducing element is different from each other.
  • a pore diameter of the side wall, a thickness of the side wall, and a length of the resonance chamber along its axis of each second sound reducing element are 0.2 millimeters, 0.5 millimeters, and 3.5 millimeters, respectively.
  • FIG. 8C illustrates exemplary sound absorption curves of a third set of sound reducing elements according to some embodiments of the present disclosure.
  • Sound reducing elements in the third set (also referred to as third sound reducing elements for simplicity) are the same except that a thickness of the side wall of each third sound reducing element is different from each other.
  • a pore diameter of the side wall, a porosity of the side wall, and a length of the resonance chamber along its axis of each third sound reducing element are 0.2 millimeters, 5%, and 3.5 millimeters, respectively.
  • FIG. 8D illustrates exemplary sound absorption curves of a fourth set of sound reducing elements according to some embodiments of the present disclosure.
  • Sound reducing elements in the fourth set (also referred to as fourth sound reducing elements for simplicity) are the same except that a length of the resonance chamber along its axis of each fourth sound reducing element is different from each other.
  • a pore diameter of the side wall, a thickness of the side wall, a porosity of the side wall of each fourth sound reducing element are 0.2 millimeters, 0.2 millimeters, and 5%, respectively.
  • the radiation energy source 930 may be arranged in the airflow channel 910. In some embodiments, the radiation energy source 930 may be arranged at a central portion of the airflow channel 910. The central portion of the airflow channel 910 may be a portion of the airflow channel 910 that is within a circular range (e.g., 10 millimeters, 20 millimeters, 200 millimeters, 0.5 centimeters, 1 centimeter, etc. ) from the axis of the airflow channel 910.
  • a circular range e.g. 10 millimeters, 20 millimeters, 200 millimeters, 0.5 centimeters, 1 centimeter, etc.
  • the radiation energy source 930 may be disposed substantially coaxially with the airflow channel 910.
  • the resonance chamber 941 of the sound reducing element 940 may also be disposed substantially coaxially with the airflow channel 910.
  • the radiation energy source 930 may be disposed substantially coaxially with the resonance chamber 941.
  • at least a portion of the radiation energy source 930 may be arranged within a space surrounded by the side wall 942.
  • the space may be, e.g., a straight circular space.
  • the resonance chamber 941 may be formed by the side wall 942 and at least a portion of an outer wall of the radiation energy reflecting member 932 of the radiation energy source 930.
  • FIG. 10 is a flowchart illustrating an exemplary process for providing an airflow according to some embodiments of the present disclosure.
  • the operations of the illustrated process presented below are intended to be illustrative. In some embodiments, the process 1000 may be accomplished with one or more additional operations not described and/or without one or more of the operations discussed. Additionally, the order of the operations of process 1000 illustrated in FIG. 10 and described below is not intended to be limiting.
  • the resonance chamber may be disposed at the central portion of the airflow channel.
  • a passage e.g., a ring-shaped passage
  • the airflow in the airflow channel may flow through the passage around the resonance chamber over the side wall.
  • at least a portion of the airflow in the airflow channel may traverse the side wall through the one or more openings.
  • the sound that is caused by the airflow in the airflow channel may at least partially enter the resonance chamber through the one or more openings (e.g., the plurality of pores) in the side wall.
  • the resonance chamber may reduce or eliminate a target portion of the sound in the resonance chamber.
  • the target portion of the sound may have frequencies within a target frequency range.
  • the target frequency range may be 1000-2000 Hz, 2000-3000 Hz, 3000-4000 Hz, 4000-5000 Hz, 5000-6000 Hz, 6000-7000 Hz, 7000-8000 Hz, 8000-9000 Hz, 9000-10000 Hz, etc.
  • the target frequency range may relate to a resonance frequency of the resonance chamber and/or at least one feature of the one or more openings.
  • an airflow channel and a resonance chamber may be provided.
  • an airflow may be effected, through an airflow generating element, in the airflow channel.
  • the operations 1110 and 1120 in the process 1100 may be the same as or similar to the operations 1010 and 1020 in the process 1000 as illustrated in FIG. 10, the descriptions of which are not repeated here.
  • the at least one radiation energy source may be configured to generate thermal radiation and direct the thermal radiation to the object.
  • each of the at least one radiation energy source may be or include a radiating element which converts electric energy into thermal radiation directed to the object.
  • the radiating element may include an infrared lamp, a filament lamp, an infrared light emitting diode (LED) , a laser device (e.g., carbon dioxide laser) , etc.
  • the radiating element may be an infrared lamp.
  • the radiating element may include a radiation emitting member (also referred to as a radiation emitter) and a radiation energy reflecting member (also referred to as a reflector) .
  • the radiation emitting member may be configured to emit radiation having a predetermined wavelength.
  • the radiation energy reflecting member may be configured to reflect the radiation toward the object. In some embodiments, the radiation emitting member may be located within an interior of the radiation energy reflecting member.
  • the radiation emitting member may be a conductive heater (e.g., a heater operated on a metal resistor or a carbon fiber) or a ceramic heater.
  • the ceramic heater may include metal heating components located inside the ceramics.
  • the at least one radiation energy source may be arranged at the airflow outlet of the airflow channel. In some embodiments, the at least one radiation energy source may be disposed in a space between the airflow channel and a housing encompassing the airflow channel. In some embodiments, the at least one radiation energy source may be disposed the airflow channel. In some embodiments, the at least one radiation energy source may further include at least one supporting element. Each of the at least one radiating element may be supported by a supporting element. In some embodiments, the supporting element may be a holder or a shroud. The at least one radiation energy source may be arranged in the space or the airflow channel through the at least one supporting element.

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Abstract

La présente invention concerne un appareil. L'appareil peut comprendre un canal d'écoulement d'air, un élément de génération d'écoulement d'air conçu pour effectuer un écoulement d'air à travers le canal d'écoulement d'air, et une chambre de résonance disposée dans le canal d'écoulement d'air et conçue pour réduire le son qui est provoqué par l'écoulement d'air. La chambre de résonance peut comprendre une paroi latérale s'étendant le long d'un axe du canal d'écoulement d'air, et une pluralité de pores dans au moins une partie de la paroi latérale. La pluralité de pores peut être conçue pour permettre à au moins une partie de l'écoulement d'air dans le canal d'écoulement d'air de traverser la paroi latérale.
PCT/CN2021/101092 2021-06-18 2021-06-18 Appareils et procédés d'affaiblissement acoustique WO2022261990A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2497192A (en) * 2011-11-29 2013-06-05 Jui-Hung Yang Hair dryer with noise reduction means
CN105982413A (zh) * 2015-02-13 2016-10-05 德昌电机(深圳)有限公司 降噪扩散器及降噪电吹风机
CN212394153U (zh) * 2019-12-26 2021-01-26 添可智能科技有限公司 一种吹风机
CN215649649U (zh) * 2021-06-18 2022-01-28 深圳汝原科技有限公司 干燥设备

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2497192A (en) * 2011-11-29 2013-06-05 Jui-Hung Yang Hair dryer with noise reduction means
CN105982413A (zh) * 2015-02-13 2016-10-05 德昌电机(深圳)有限公司 降噪扩散器及降噪电吹风机
CN212394153U (zh) * 2019-12-26 2021-01-26 添可智能科技有限公司 一种吹风机
CN215649649U (zh) * 2021-06-18 2022-01-28 深圳汝原科技有限公司 干燥设备

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