138 results about "Fan noise" patented technology

The technology described herein is directed towards a metasurface arranged with unit cells for broadband and / or multiband sound absorption, in which the unit cells are based on the principles of Helmholtz resonators. Deeply subwavelength sound absorbing unit cells are designed and constructed based on desired resonance frequencies. Each unit cell includes a neck portion and air chamber dimensioned to resonate at a desired resonance frequency and thereby inverse phase cancel corresponding frequencies of incoming sound waves. Differently designed and arranged subgroups of unit cells are part of the metasurface, which can be positioned proximate to a noise source. As practical examples, the metasurface or multiple metasurfaces can be placed near or wrapped around a computer server or rack of servers to absorb fan noise. The metasurface components (including the unit cells) can be printed by a 3D printer to result in a thin, light-weight, and cost effective noise absorbing metasurface.

The invention discloses a piezoelectric fan control method, a piezoelectric fan control device, an electronic device and a computer readable storage medium, and relates to the technical field of fan control. The piezoelectric fan is connected with a to-be-cooled device, and the control method comprises the steps that according to the hot spot temperature of a power device of the to-be-cooled device and the temperature of a shell of the to-be-cooled device, operation gears of the piezoelectric fan are determined, and the operation gears comprise the closing gear, the low-power-consumption optimal operation gear and the full-power gear; and under the condition that the operation gear of the piezoelectric fan is the low-power-consumption optimal operation gear, the driving voltage and the working frequency of the piezoelectric fan are adjusted according to a multi-objective function until the parameters of the multi-objective function are reduced to the minimum value, and then the piezoelectric fan is started. The parameters of the multi-objective function comprise fan power consumption and fan noise of the piezoelectric fan. According to the piezoelectric fan, low-power-consumption and low-noise operation can be kept on the premise that safe heat dissipation of the piezoelectric fan is ensured.

The invention provides a fan noise reduction method and device, electronic equipment and a storage medium, the method is applied to the electronic equipment comprising a fan, and the method comprises the steps that the current temperature of the electronic equipment is obtained; determining a first target rotating speed of the fan based on the current temperature of the electronic equipment; determining a rotating speed fluctuation range corresponding to the first target rotating speed; the current rotating speed of the fan is controlled to be the first target rotating speed, and multiple second target rotating speeds are obtained based on the first target rotating speed and the rotating speed fluctuation range; the fan is controlled to operate at the second target rotating speeds in sequence; each second target rotating speed is used for reducing the noise of the audio of the fan. According to the method, after the rotating speed of the fan is adjusted to the target rotating speed, range fluctuation is conducted on the target rotating speed, the constant inherent frequency of fan sound can be scattered, the noise outburst ratio of the fan sound is reduced, and then noise reduction of the fan is achieved.

The invention discloses a fan noise control method, device and system and an air conditioner, and belongs to the field of fan noise control. The draught fan noise control method comprises the steps that when it is determined that the noise of a draught fan is unqualified, the noise peak frequency of the noise is obtained; determining the noise type of the noise based on the noise peak frequency; and the fan blade angle is adjusted based on the noise type. According to the scheme, when the fan noise is unqualified, different types of noise can be determined based on the noise peak frequency, and then the fan blade angle is adjusted by adopting different adjusting modes according to the different types of noise, so that when the noise is unqualified, the fan blade angle can be adjusted in a targeted manner based on the different types of noise, adjustment can be performed in time, and the fan blade angle adjusting efficiency is improved. And a sound wave generator is not needed, the cost is low, the method can be suitable for various use scenes, and the use experience of a user is not affected.

The utility model discloses a notebook computer automation test assembly line, which comprises a code scanning connection station, a horn test device, a fan noise test device and a microphone test device which are sequentially arranged along a product circulation direction, and is characterized in that the code scanning connection station is used for calibrating the position and the opening and closing angle of a notebook computer and can scan the code of the notebook computer; the loudspeaker test equipment is used for testing loudspeaker performance and keyboard resonance performance of the notebook computer, and the fan noise test equipment is used for testing noise conditions of a cooling fan of the notebook computer; a material receiving assembly is arranged on one side of the microphone testing device, and the microphone testing device is used for testing the microphone performance and the microphone air tightness of the notebook computer and sending the tested notebook computer to the material receiving assembly. According to the utility model, an assembly line type operation mode is adopted, manual transfer is not needed, multiple test operations of the notebook computer can be completed at the same time, the labor cost of the test is reduced, and the test efficiency can be greatly improved.

The utility model relates to the technical field of fan noise reduction, in particular to an impeller, a fan and a cleaning device, the impeller comprises a seat body and fan blades, the seat body is provided with a top surface and a curved surface, and the curved surface surrounds the top surface and intersects with the top surface. And one end of each fan blade is connected with the seat body and extends on the curved surface. According to the impeller, generated noise can be reduced.

The invention relates to an air conditioner outdoor unit with an active noise reduction function, an air conditioner and an active noise reduction method, and relates to the technical field of air conditioners. The air conditioner outdoor unit comprises a machine shell; the fan is arranged in the machine shell; the compressor is arranged in the machine shell; the sound collection module is arranged in the machine shell, is close to the fan and the compressor and is used for collecting a first sound signal; the first sound signal comprises at least one of compressor noise and fan noise; the control module is connected with the sound acquisition module and is used for determining a noise total value and a noise peak value of the first sound signal and generating a control electric signal according to a comparison result of the noise total value and the noise peak value; the piezoelectric braking module is arranged on the machine shell, is connected with the control module and is used for generating deformation under the action of the control electric signal so as to drive the machine shell to vibrate, and a reverse sound wave signal generated by the vibrating machine shell is used for weakening the first sound signal. The air conditioner outdoor unit can achieve active noise reduction.

The present disclosure relates to a method and device for acoustically imaging fan noise, an electric vehicle charging pile, and a storage medium. The method comprises: acquiring a noise time-domain signal generated by a fan when the fan is running; performing time-frequency conversion on the noise time-domain signal based on a short-time Fourier transform algorithm to obtain a noise frequency-domain signal; inputting the noise frequency-domain signal into a delay-and-sum beamformer to perform beamforming to obtain beam data; positioning principal component data of the beam data to obtain sound power data; and generating a sound image containing a sound source position according to the sound power data. In this embodiment, the resolution of the noise can be improved by positioning the principal component of the beam data, which achieves the effect of accurately positioning the sound source position and is conducive to obtaining a more accurate sound image.

This invention discloses a broadband duct silencing structure combining perforated tubes and cavities. The structure uses a galvanized housing as its main body, with perforated tubes coaxially arranged inside. A perforated partition divides the structure into front and rear silencing chambers. The front silencing chamber contains a first sound absorber and an air layer, forming a Helmholtz resonant cavity to efficiently eliminate low-frequency fan noise. The rear silencing chamber is filled with a second sound absorber and is equipped with perforated tubes, micro-perforated tubes, and micro-perforated inserts with progressively smaller apertures, forming a gradient microporous structure to achieve broadband absorption of mid-to-high frequency noise. The structure utilizes the airflow in the duct to drive the impeller to rotate, which in turn drives a bidirectional reciprocating screw via bevel gear transmission. This drives a delivery rod and a one-way valve to form a directional airflow circulation. The sound absorber is automatically purged through the air duct and comb-shaped air duct to remove fiber dust, preventing secondary pollution and stabilizing acoustic performance. This invention combines the advantages of low-frequency resonance silencing and mid-to-high frequency gradient microporous sound absorption, featuring a compact structure, wide silencing bandwidth, and stable and reliable operation.

This invention relates to a range hood, comprising: a body, a baffle plate, and a fan cabinet. The body has an internal smoke collection chamber and includes a front panel and a top panel connected to the front panel. An air inlet is located at the bottom of the front panel, and an air outlet is located on the top panel. When the range hood is operating, the fan cabinet provides suction, causing the cooking fumes in the kitchen space to enter the first chamber through the air inlet, then enter the air intake side of the fan cabinet, and are discharged outwards into the common flue through the air outlet and the air outlet. During normal use, the air in the second chamber is blocked by the baffle plate from entering the first chamber, thus preventing turbulence with the air entering the fan cabinet from the air inlet. This allows the fan cabinet to concentrate the smoke intake from the air inlet, optimizing the smoke extraction effect and reducing the fan cabinet's operating frequency, thereby reducing fan noise and saving energy.

The application provides a device heat dissipation adjustment device and a VR device. The device comprises a noise detection module and a heat dissipation control module. The noise detection module and the heat dissipation control module are in communication connection. The noise detection module detects the environmental noise of the environment where the device is located and the fan noise generated by the heat dissipation fan, and sends the environmental noise and the fan noise to the heat dissipation control module. The heat dissipation fan is arranged in the device to dissipate heat of the device. The heat dissipation control module adjusts the rotating speed of the heat dissipation fan according to the environmental noise and the fan noise. Compared with the prior art, the device heat dissipation adjustment device can adjust the rotating speed of the heat dissipation fan according to the environmental noise and the fan noise generated by the heat dissipation fan, so that the device reaches a balance between user experience and heat dissipation noise by dynamically adjusting the rotating speed of the heat dissipation fan, thereby enabling the user to obtain a better experience.

The utility model relates to the technical field of ventilation treatment, and discloses a ventilation component and ventilation treatment equipment. The ventilation component is used for being arranged in the ventilation treatment equipment and comprises a ventilation pipe body (11), a curve air channel (111) used for prolonging an airflow circulation path is defined in the ventilation pipe body (11), and an air inlet (112) of the air channel (111) is used for being correspondingly communicated with a main machine air inlet (22) of the ventilation treatment equipment. And an air outlet (113) of the air passage (111) is used for being correspondingly communicated with an air inlet of a fan (21) in the ventilation treatment equipment. According to the ventilation component provided by the utility model, the curved air channel is arranged in the ventilation component to guide the air flow to flow and prolong the air flow flowing path, so that on one hand, the effect of extending the air path can be realized through three-dimensional folding in a smaller space, and on the other hand, the noise of a fan can be prevented from being transmitted out, thereby realizing the purposes of flow stabilization and noise reduction.

The embodiment of the application discloses a fan noise reduction method and device, electronic equipment and computer readable storage medium, and belongs to the technical field of noise reduction. The method comprises the following steps: obtaining running state information and running condition information of a target fan; identifying the running state information to obtain noise source information; determining a target control parameter based on the noise source information and the running condition information; and performing noise reduction processing on the target fan based on the target control parameter. In this way, by accurately identifying the noise source information in the running state information of the target fan, the appropriate target control parameter can be determined in combination with the running condition information, the targeted noise reduction processing of the target fan is realized while ensuring the stable operation of the target fan, thereby effectively improving the noise reduction effect and improving the quiet comfort of the user.

This application discloses a control method, control device, electronic device, and computer-readable storage medium for a piezoelectric fan, relating to the field of fan control technology. The piezoelectric fan is connected to a device to be cooled. The control method includes: determining the operating level of the piezoelectric fan based on the hot spot temperature of the power device and the casing temperature of the device to be cooled; the operating level includes an off level, a low-power optimal operating level, and a full-power level; and when the operating level of the piezoelectric fan is the low-power optimal operating level, adjusting the driving voltage and operating frequency of the piezoelectric fan according to a multi-objective function until the parameters of the multi-objective function are reduced to a minimum value, the parameters of the multi-objective function including the fan power consumption and fan noise of the piezoelectric fan. This application ensures that the piezoelectric fan maintains low power consumption and low noise operation while ensuring safe heat dissipation.

The utility model provides a fan with noise reduction function relates to fan noise reduction technical field, including ventilation pipe still includes the vibration reduction subassembly, and the vibration reduction subassembly includes the soundproofing cotton fixedly connected in the inside of ventilation pipe, the inside fixedly connected with the positioning plate of ventilation pipe, the inside fixedly connected with the inner side plate of one end of ventilation pipe close to the positioning plate, the refraction subassembly, the refraction subassembly includes the refraction board fixedly connected in the inside both ends of ventilation pipe, the inside of refraction board is provided with the resilience angle, the inside of resilience angle is provided with the inner recess, the inside fixedly connected with the ventilation subassembly of ventilation pipe, like this design has realized the stable form of soundproofing cotton under the high speed airflow, suppresses ventilation pipe thin wall resonance, reduces the eccentric vibration of fan blade, thereby effectively solved the secondary structure radiation noise caused by motor and impeller unbalance excitation, from the source controlled mechanical noise, weakened the vibration transmission problem caused by eccentricity.

The present disclosure provides a fan structure of an open rotor engine and an open rotor engine. The fan structure comprises: a hub; rotor blades and stator blades which are sequentially arranged along an airflow direction on an outer periphery of the hub; wherein a trailing edge of the rotor blades is provided with a first noise reduction structure, the first noise reduction structure comprising a plurality of first holes formed on a surface of the rotor blades and a plurality of dissipation cavities located inside the rotor blades, each first hole being in communication with at least one dissipation cavity, and / or a leading edge of the stator blades is provided with a second noise reduction structure, the second noise reduction structure comprising a plurality of fairing portions protruding from a surface of the stator blades, a surface of the fairing portions facing the airflow direction being a smooth curved surface. The open rotor engine comprises the aforementioned fan structure. The fan structure and the open rotor engine provided by the present disclosure can effectively reduce fan noise.

The invention discloses a noise reduction fan, an energy storage tank and a vehicle-mounted refrigerator, the noise reduction fan comprises a fan base, a fan mounting plate, a fan body, a noise reduction structure and a damping structure, and the interior of the fan base is hollow and circular; the fan mounting plate corresponds to the fan base in shape and is detachably mounted on one side of the fan base; the fan body is detachably mounted on the other side of the fan base and blows air towards the fan mounting plate; the noise reduction structure is arranged in the fan mounting plate and is used for reducing noise of the noise reduction fan; the damping structure is arranged between the fan base and the fan body and used for damping of the noise reduction fan. The noise reduction structure and the damping structure are used in cooperation, so that airflow generated during fan operation can be effectively divided and buffered, airflow noise can be weakened, mechanical noise generated by fan vibration can be absorbed, the dual noise reduction effect is remarkable, the fan noise in a vehicle-mounted closed space can be effectively reduced, and the comfort level of the environment in a vehicle is improved.

The present application relates to the technical field of fan noise reduction, and specifically provides an axial flow fan, an axial flow fan design method, a fan assembly, and a chassis. The axial flow fan comprises a hub and at least two fan blades. The at least two fan blades are mounted on the outer peripheral surface of the hub in an annular array, and the fan blades are arranged obliquely relative to the axis of the hub. Each fan blade comprise a blade root and a blade tip; the blade root is connected to the hub; the blade tip is located at the end of the fan blade extending radially from the hub; the blade root smoothly extends to the blade tip; the size of the mean camber line in the circumferential section of the fan blade gradually increases; a leading edge and a trailing edge are provided between the blade root and the blade tip; and the leading edge and the trailing edge are bent into an arc shape towards the rotation direction of the fan blade. The axial flow fan provided by the present application can achieve a balance among airflow, air pressure, and noise.

A rotary component for a gas turbine engine includes a plurality of rotor blades operably coupled to a rotating shaft extending along the central axis and an outer casing arranged exterior to the plurality of rotor blades in a radial direction of the gas turbine engine. The outer casing defines a gap between a blade tip of each of the plurality of rotor blades and the outer casing. The outer casing includes a plurality of features formed into an interior surface thereof. Each of the plurality of features includes one or more design parameters that are perturbed about a mean design parameter for stall performance so as to provide a circumferential variation in wake strengths associated with the plurality of rotor blades, thereby reducing operational noise of the gas turbine engine.

The present application relates to the technical field of ventilation treatment, and discloses a ventilation component and a ventilation treatment device.The ventilation component is arranged in the ventilation treatment device and comprises a ventilation pipe body (11), the inside of the ventilation pipe body (11) is defined with a curved air passage (111) for prolonging the air flow circulation path, the air inlet (112) of the air passage (111) is used for corresponding communication with the main machine air inlet (22) of the ventilation treatment device, and the air outlet (113) of the air passage (111) is used for corresponding communication with the air inlet of the fan (21) in the ventilation treatment device.The ventilation component provided by the present application can guide the air flow and prolong the air flow path by arranging the curved air passage in the ventilation component, so that the effect of air path prolonging can be achieved by three-dimensional folding in a smaller space, and the fan noise can be blocked from being transmitted out, so that the purposes of stable flow and noise reduction are achieved.

The invention discloses a matrix type engine fan which comprises an engine assembly, an assembling mechanism and a matrix mechanism, the assembling mechanism is arranged at the front end of the engine assembly, and the matrix mechanism is arranged on the assembling mechanism; the assembling mechanism comprises a fan support, an assembling assembly and a supporting assembly. And the assembling component comprises an idle pulley mounting seat, an idle pulley mounting hole, a fan clutch assembly mounting hole, a fan belt pulley mounting seat, a fan belt pulley fixing hole, a fan bracket mounting foot, a fan bracket mounting hole, an enclosed weight reduction groove, a side weight reduction groove and a top weight reduction groove. According to the scheme, the cooling efficiency of the fan is improved, the power consumption of the fan is reduced, the economical efficiency of the whole vehicle is improved, the noise of the fan is reduced, and the maintenance frequency and maintenance cost of the fan are reduced.

Described herein are active noise reduction (ANR) techniques for reducing noise produced by a fan(s) of a head-mounted display (HMD). An example process may include receiving data indicative of a noise that is being produced by the fan(s), determining, based at least in part on the data and using a model(s), one or more audio parameter values, and outputting, via one or more off-ear speakers of the HMD, a sound(s) having one or more audio characteristics based at least in part on the one or more audio parameter values to reduce the noise produced by the fan(s) at a location(s) of an ear(s) of the user of the HMD.

According to the control method of the kitchen air conditioning system, an air conditioner module and a range hood are included, a heat dissipation air channel of the air conditioner module is provided with a first air inlet and a first air outlet, an indoor unit air channel is provided with a second air inlet and a second air outlet, and a first three-way valve is installed between the first air outlet and a fresh air pipe; according to the control method, working mode switching is achieved through switching of the first three-way valve and the second three-way valve, in the single-opening range hood mode, the first air outlet is communicated with the fresh air pipe, the second air inlet is communicated with the air supplementing pipe, and in the mode that the air conditioner and the range hood are started, the first three-way valve and the second three-way valve are switched. The first air outlet communicates with the air supplementing pipe, and the fresh air pipe communicates with the second air inlet. According to the control method of the kitchen air conditioning system, the working state of the compressor can be controlled according to the kitchen temperature, the energy-saving requirement of the system is met, the working gear of the first fan is adaptively adjusted according to the condensing temperature, and the system performance and the fan noise influence are considered.

The utility model relates to the related field of noise reduction assembly, especially a fan noise reduction assembly, including sound insulation room, sound insulation door, observation window, exhaust pipe, ventilation assembly and sound insulation board etc. The utility model discloses high damping vibration stop layer, high -efficient sound absorption sound insulation layer, metal pipe cover damping rubber are set up to reduce the noise that air flows in the pipeline produces, and is provided with sound insulation board in sound insulation room to reduce the mechanical noise that fan generates when working, and through ventilation assembly to the fan ventilation cooling in sound insulation room, and the sound reduction board can carry out the noise reduction treatment to the flowing air in the ventilation pipe, reduces the noise pollution through, is favorable to reducing the influence of large -scale fan for electric heating furnace in the use process to the production environment.

The embodiment of the present application relates to the fan noise reduction technical field, and particularly discloses an active noise reduction method for a portable fan, which comprises: obtaining a noise signal; the noise signal is a dynamic comprehensive noise signal comprising air inlet noise, air outlet noise, fan blade noise and / or motor noise generated when the portable fan is running; noise control processing is carried out on the noise signal based on a pre-trained noise reduction model to obtain a noise control instruction; a noise reduction signal is sent based on the noise control instruction to carry out active noise control on the portable fan; wherein, within a preset error allowable range, the phase of the noise reduction signal and the noise signal is opposite, the frequency and amplitude are the same, and the noise signal is used for destructive interference. The present application dynamically analyzes the dynamic comprehensive noise signal generated inside and outside the cavity when the fan is running, and sends a corresponding noise reduction signal according to the dynamic comprehensive noise signal, so as to realize active noise control on the fan, thereby reducing the noise level when the fan is running.

The utility model provides a fan noise reduction device which comprises a support, the bottom of the support is arranged in a cement floor, and a fan is located among four supporting legs of the support; the multiple sound insulation plates are detachably arranged on the support, and when the sound insulation plates are installed on the support, the draught fan is located in the support; the mounting assemblies are arranged on the sound insulation plates respectively, and the sound insulation plates are detachably connected with the support through the mounting assemblies. The sound insulation plates are sequentially installed along the support, the sound insulation plates and the support are rapidly buckled through the installation assemblies, the sound insulation plates can be rapidly fixed while the sound insulation plates are conveniently installed, and compared with a traditional mode of installation through screws or welding, more time is saved, installation and disassembly are convenient, and the installation efficiency of the sound insulation plates is improved.

The invention discloses a fan cavity noise reduction device, a control method and an air conditioner, the fan cavity noise reduction device is applied to a fan cavity, and the fan cavity noise reduction device comprises a micro-perforated plate arranged in the fan cavity, and the micro-perforated plate comprises a back cavity. The micro-perforated plate can be regarded as an acoustic element with acoustic resistance and acoustic quality, the micro-perforated plate is installed in front of the back cavity, a certain cavity is reserved behind the back cavity, in this way, a resonance sound absorber can be formed, and noise reduction is conducted on the fan cavity through the resonance sound absorption effect. In addition, different micro-perforated plate specification parameters such as the thickness, the hole diameter and the back cavity depth of the micro-perforated plate can be set based on the actual situation, the specification parameters can influence the sound absorption coefficient of the structure, and therefore the micro-perforated plate specification parameter most conforming to the actual scene is selected, and the fan noise control effect is improved.

Disclosed are a fan actuator and a fan motor having same. The fan motor comprises: an impeller which receives power from a motor and rotates around a rotation shaft; and an excitation device which reduces noise generated by the impeller. The excitation device comprises: a coil to which power is applied; a yoke rotatably mounted on the impeller; and a magnet coupled to the yoke so as to rotate together with the impeller about the rotation shaft with respect to the coil, wherein an axial-direction excitation force can be applied to the impeller by electromagnetic interaction between the magnet and the coil. Accordingly, fan noise can be reduced.

The utility model relates to the technical field of fresh air equipment, and discloses fresh air equipment. The fresh air equipment comprises a shell assembly, a heat exchange core assembly and a draught fan. The shell assembly is provided with an air channel communicating with the indoor environment and the outdoor environment. The heat exchange core assembly is arranged in the air duct and comprises a first heat exchange core and a second heat exchange core, and the first heat exchange core and the second heat exchange core are arranged in the length direction of the air duct; and the fan is arranged in the air duct and between the first heat exchange core and the second heat exchange core. The fan is arranged between the first heat exchange core and the second heat exchange core, the air volume loss can be reduced while the interference of fan noise to the indoor environment is reduced, and therefore noise control and air volume increase are effectively balanced.

The application relates to the field of fan noise reduction technology, and particularly discloses an active noise reduction device for a portable fan, which comprises a signal collector arranged in a cavity of the portable fan and used for collecting noise signals generated by the portable fan in real time when the portable fan is running; a signal processor arranged in the cavity and electrically connected with the signal collector, used for calling a pre-trained noise reduction model to perform noise control processing on the noise signals, and obtaining noise control instructions; and a signal generator arranged in the cavity and electrically connected with the signal processor, used for obtaining the noise control instructions and emitting noise reduction signals according to the noise control instructions to perform active noise control on the portable fan; wherein, within a preset error allowable range, the noise reduction signals and the noise signals are opposite in phase, same in frequency and same in amplitude, and are used for performing destructive interference on the noise signals. The application realizes destructive interference on the noise signals by emitting the noise reduction signals, so that the noise level during the running of the fan is reduced.