31 results about "Fan noise" patented technology

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.

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 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 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 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 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.

The utility model discloses a small computer host structure, and upper cover plate, middle frame and bottom plate are fixed through stud, and upper cover plate and middle frame have clearance space between both, and PC ornament strip is further equipped on the rear side of middle frame, and the upside of PC ornament strip on middle frame is equipped with big air outlet, and the air inlet of lower air inlet air flue and VESA hanging bracket hole are equipped on bottom plate, and the corresponding place of CPU processor position of mainboard is equipped with turbine fan, copper fin and heat conduction copper pipe, and heat conduction copper pipe conducts the temperature of CPU processor to copper fin, and then the heat on copper fin is taken away through the air flow of turbine fan. The utility model discloses the mode of copper pipe plus copper fin, and the efficiency of heat conduction is greatly improved, and the perpendicular through type air flue of up and down air inlet is adopted, and the fan noise is greatly reduced, and the structure adopts integrated molding plus modular assembly, and the screw fixing mode is greatly reduced, and the overall simplicity and assembly production efficiency of product are improved, and it is simple and beautiful.

The application discloses a fan sound insulation, noise reduction and heat dissipation integrated device for remote monitoring and intelligent regulation and control, relates to the technical field of fan noise control and heat dissipation integration, and comprises a signal acquisition module, an acoustic analysis module, an interference identification module, a parameter adjustment module and a dynamic anti-misoperation triggering control module.The signal acquisition module acquires impact sound signals, vibration signals and airflow change data in a fan operation environment, arranges all the acquired signals in time sequence, eliminates stable background noise and generates impact sound time sequence data sets.Through multi-source signal acquisition and time sequence analysis, the application realizes the differentiation of external impact sound and equipment operation sound, prevents frequent start and stop caused by misoperation self-checking, adjusts operation rhythm through interference coupling calibration, introduces double confirmation sampling, a silent window and flexible start control, and ensures the stable operation of the fan in a complex environment and prolongs the service life.

The application discloses an in-vehicle cooling fan noise prediction method, device and equipment, which is used for more intuitively and accurately predicting cooling fan noise. The method comprises the following steps: determining a cooling fan active end excitation force; determining a cooling fan vibration isolation system force transmission coefficient; multiplying the cooling fan active end excitation force by the cooling fan vibration isolation system force transmission coefficient to obtain a cooling fan passive end excitation force; and multiplying the cooling fan passive end excitation force by a vehicle body noise transmission function to obtain a cooling fan structure-borne noise.

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 installed in sequence along an airflow direction on an outer periphery of the hub; a sound signal generator; and a control device connected to the sound signal generator and configured to cause the sound signal generator to emit a noise reduction sound wave for superimposing with a noise sound wave generated by airflow passing through the rotor blades and the stator blades, so as to reduce an amplitude of the noise sound wave, in a state that the rotor blades rotate around an axis of the hub. 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.

This application discloses an electrical device and an energy storage system. The electrical device includes at least one first electrical module, a silencing duct, and a fan. The first electrical module has a first accommodating cavity, a first duct, and a second duct. The first duct is located on at least one of the two ends of the first accommodating cavity in a first direction, and both extend along a second direction. The second duct extends along the first direction and communicates with the first duct. The first vent of the silencing duct communicates with the second duct, and the second vent of the silencing duct communicates with the external environment. The second vent is located away from the first vent within the silencing duct. The fan is located at the first vent. Fan noise needs to propagate outward through the silencing duct or the first and second ducts, effectively extending the sound wave transmission path and increasing the number of sound wave reflections, thus achieving noise attenuation and ultimately reducing the noise of the air-cooled heat dissipation system of the electrical device.

This invention discloses a broadband noise reduction device for small devices based on a miniaturized composite acoustic black hole structure, belonging to the field of fan noise reduction technology in the high-end equipment industry. The device includes at least one miniaturized acoustic black hole unit, which miniaturizes a truncated acoustic black hole structure to a cross-sectional size of approximately 30mm × 30mm. It is constructed by integrating porous sound-absorbing material layers into the power-law contraction of the through-hole walls and lateral cavities. The miniaturized truncated structure promotes low-frequency global resonance to expand the bandwidth, while the porous material layers compensate for low-frequency leakage caused by miniaturization and smooth absorption peaks. This device can be directly integrated as an independent functional component into the cooling fan housing or air guide of high-end equipment, achieving efficient passive absorption of broadband aerodynamic noise above 1000Hz with almost no increase in size or air resistance. It is particularly suitable for noise reduction inside space-constrained electronic equipment, and especially for aerodynamic noise control of miniature fans.

The utility model relates to fan noise reduction technical field especially, it relates to a cooling tower fan damping and noise reduction device. Its technical scheme includes: pedestal and cylinder, the pedestal is equipped with the support plate through the damping component, the cylinder is established on the support plate, the inside of cylinder is equipped with the fan body through the buffer component. The utility model reduces the cracking risk of the air duct through the cooperation between the structure and the design of buffer component, reduces the working noise through the design of damping component, improves the fan operation stability and improves the fan operation stability.

This utility model discloses a noise reduction device for dry-type transformers, relating to the field of transformer technology. The device includes a base vibration damping assembly comprising a support base disposed at the bottom of the transformer, the support base being connected to the transformer housing via at least four adaptive vibration damping units; a winding noise reduction structure, wherein both the high-voltage and low-voltage windings of the transformer are fitted with annular damping sleeves; and a fan noise reduction unit, wherein the inner walls of the fan inlet and outlet at the top of the transformer are covered with sound-absorbing cotton. Each adaptive vibration damping unit includes: a support member at the upper end, a connecting rod at the lower end, a magnetorheological damper located between the support member and the connecting rod, and a vibration sensor disposed on the transformer housing and electrically connected to the magnetorheological damper. This device, through the synergistic effect of multiple structures, effectively reduces the operating noise of dry-type transformers from multiple aspects such as vibration damping, winding noise reduction, and fan noise reduction, improving the comfort of the user environment and showing good application prospects.

This invention relates to the field of intelligent control, and more particularly to an intelligent control method for a photovoltaic energy storage direct-drive five-constant system. The invention monitors environmental data from several spatial areas to extract the environmental state characteristics of each area; combines these environmental state characteristics with fluctuations in fan noise intensity to analyze the environmental quality characterization values ​​of the spatial areas, thus marking them; in response to the presence of marked spatial areas, the invention assesses and analyzes the environment of those areas to determine the environmental quality degradation level of occupied spaces; and based on this degradation level, it adaptively regulates the control equipment within the occupied spaces. This invention improves the accuracy and targeting of environmental control while optimizing human comfort, aligning with the core experience requirements of a five-constant system.

The utility model relates to a heat dissipation technology especially a heat dissipation device and bedding, and the technical problem to be solved is how to carry out heat dissipation to the battery built in the pillow. The heat dissipation device includes an air pump, a first air valve, a second air valve and a gas charging and discharging pipeline, the air pump, the first air valve and the second air valve are communicated with each other through the gas charging and discharging pipeline, the first air valve is used for connecting the air bag needing to be charged and discharged, the utility model can produce airflow and make it enter the gas charging and discharging pipeline and flow out through the second air valve when the air bag is pressure released and when the air pump inhales under the condition that the first air valve is closed, thereby carrying out heat dissipation for the heating component, so that it is not necessary to use the heat dissipation fan, thereby not producing the fan noise, and simultaneously, as the fan specially used for heat dissipation is not additionally arranged, the product structure is not complicated, thereby improving the product reliability.

The application discloses a noise reduction structure for a noise reduction fan, wherein the noise reduction fan comprises a fan mounting plate, a fan base and a fan body which are connected in sequence, the fan base and the fan mounting plate are hollow and circular in shape, and the noise reduction structure comprises a plurality of noise reduction rings and a plurality of connecting assemblies; the plurality of noise reduction rings are arranged coaxially in sequence in the fan mounting plate; the connecting assemblies are connected in sequence with the plurality of noise reduction rings; and one end of the plurality of connecting assemblies is connected with the fan mounting plate respectively, and the other end of the plurality of connecting assemblies is gathered and connected at the shaft center of the plurality of noise reduction rings. The plurality of noise reduction rings which are arranged coaxially in sequence and the plurality of connecting assemblies can effectively reduce the noise of the fan, improve the comfort of the environment, and firmly fix the noise reduction rings, so that the problems of poor noise reduction effect and unstable noise reduction structure of the existing fan are solved.

Examples of the disclosure describe systems and methods for reducing audio effects of fan noise, specifically, for a wearable system. A method wherein operating a fan of a wearable head device: detecting, with a microphone of the wearable head device, noise generated by the fan generating a fan reference signal. wherein the fan reference signal represents at least one of a speed of the fan, a mode of the fan, a power output of the fan, and a phase of the fan; deriving a transfer function based on the fan reference signal and based further on the detected noise of the fan: generating a compensation signal based on the transfer function: and while operating the fan of the wearable head device, outputting, by a speaker of the wearable head device, an anti-noise signal, wherein the anti-noise signal is based on the compensation signal.

A fan noise reduction method, system and medium, comprising collecting operation data of a fan motor; preprocessing the operation data, and respectively performing time domain feature extraction and frequency domain feature extraction on the preprocessed operation data to generate a feature vector set; standardizing the feature vector set, and according to a pre-set sliding window, intercepting the standardized feature vector set to obtain a model input matrix; inputting the model input matrix into a pre-trained load prediction model, and through model forward propagation calculation, outputting a load change trend, a mutation amplitude and a mutation time; based on the load change trend, the mutation amplitude, the mutation time and real-time electrical data, through an optimization algorithm, obtaining optimized magnetic field oriented control parameters and auxiliary control parameters and issuing them to the fan motor to adjust the motor operating state. The present application realizes the advance prediction of the fan load change trend, mutation amplitude and mutation time, and effectively improves the fan noise reduction effect.

This invention relates to the field of fan, speaker, and light design and control technology, and discloses a low-noise design method for a speaker fan based on fan noise. The method includes receiving the original audio signal, generating an audio power spectrum, and extracting low-frequency transient features; calculating the instantaneous masking threshold using a psychoacoustic model, and then inversely shaping the allowable noise power spectrum of the fan motor to generate a target fan spectrum; generating a fan drive signal based on the target spectrum using a random spread spectrum algorithm, and constructing an airflow velocity vector by combining the angular velocity fed back from the motor and the duct parameters; calculating the phase compensation amount based on the airflow velocity vector to generate a phase correction signal, and then combining the low-frequency transient features with an anti-phase aerodynamic impedance compensation component to synthesize a speaker signal; finally, driving the fan motor and speaker unit to operate synchronously. This invention utilizes the auditory masking effect to achieve invisible fan operation and cancels the interference of airflow on sound waves through flow field mapping and phase pre-distortion, achieving synergistic optimization of the sound field and airflow field.

This invention discloses a multimedia training device for Chinese language reading, relating to the field of Chinese language reading training technology. It includes a main body with a damping shaft at its bottom. A support member is rotatably connected to the middle of the damping shaft. A heat dissipation mechanism is located on one side of the main body, comprising a heat dissipation box fixedly connected to the side of the main body. The heat dissipation box contains several heat-conducting bases, each containing a heat pipe. A sealed cavity is located inside the heat dissipation box, with the end of the heat pipe away from the heat-conducting base extending into the sealed cavity. This multimedia training device for Chinese language reading, by employing a fanless design, precisely connects phase-change materials and heat pipes to various high-temperature heat sources, directionally absorbing and storing heat, completely eliminating fan noise and preventing localized heat accumulation. This effectively solves the problems of untargeted heat dissipation and lag, ensuring a quiet and smooth reading training process.

This application discloses an improved exhaust system device for a grinding machine, comprising: a support frame and a cover plate. The support frame includes: a base plate and side plates. The base plate is a flat plate structure with a through hole. The side plates have a first side and a second side arranged opposite each other along the width direction. There are two side plates, one with its first side fixedly connected to one side of the base plate, and the other with its first side fixedly connected to the other side of the base plate. One end of the cover plate is rotatably connected to the side plates. Compared with the existing direct exhaust method of grinding machines, this application has an exhaust structure in multiple directions (up, down, left, and right). The direction of the hood can be adjusted at will according to the exhaust requirements of the construction environment, avoiding blowing on people or objects and ensuring that there is no dust in the construction site. The support frame of this application has a square funnel structure, and heat dissipation grooves are provided on the side plates, which can reduce fan noise and improve the working effect of the machine.

This invention discloses a noise reduction structure for an axial flow fan with non-uniform gap distribution, belonging to the technical field of axial flow fan structure. It includes a casing with an internal flow channel cavity, and an impeller with Z blades coaxially mounted within the flow channel cavity. The inner wall surface of the casing corresponding to the blade sweep area has a non-uniform undulating surface, which exhibits continuous wavy undulations along the circumference, defining alternating peak and trough regions. The number of trough regions, N, is coprime to the number of blades, Z, used to disperse the circumferential phase interference of tip leakage vortices. An acoustic attenuation structure is asymmetrically embedded only on the back side of the corresponding trough region inside the casing to target and absorb low-frequency eddy current noise at the maximum radial gap. This invention combines macroscopic topological frequency misalignment with microscopic targeted sound absorption, effectively eliminating discrete frequency noise while ensuring the structural strength of the casing and the overall aerodynamic efficiency of the fan.

The utility model belongs to drying equipment technical field, concretely relates to a kind of drying room fan noise reduction equipment, including fan main body and air outlet, air outlet is connected to the front side of fan main body, and the outer surface of air outlet is provided with noise reduction assembly;Noise reduction assembly includes protective housing, soundproof board, resonance cavity, sound absorption board, barrier, sound-absorbing sheet and sound guide board, protective housing is sleeved on the surface of air outlet, soundproof board is connected in the inside of protective housing, resonance cavity is connected in the inside of soundproof board, and sound absorption board is connected in the inside of resonance cavity.Barrier is connected in the inside of sound absorption board, sound-absorbing sheet is connected in the inside of barrier, sound guide board is connected in the inside of sound-absorbing sheet, and sound guide board is connected to the outer surface of air outlet.The utility model provides a kind of drying room fan noise reduction equipment, can reduce the sound propagation when airflow passes through air outlet, optimize the noise generated by fan main body, to improve working environment, reduce the discomfort due to noise generation.

This invention proposes a fan noise reduction device, comprising: a fan, the fan including a blade and a motor; an upper volute disposed at the top of the blade; a lower volute connected to the upper volute and enclosing the fan, the lower volute having a fundamental frequency filter hole penetrating through the lower volute; a motor disposed at the bottom of the lower volute and connected to the blade via a rotating shaft; and a first silencing cavity corresponding to the fundamental frequency filter hole on the side of the lower volute away from the blade. The blade rotates at high speed, and the surrounding medium generated by the rotation of the blade flows through the volute. When the airflow enters the fundamental frequency filter hole, it flows into the first silencing cavity. The resonant silencing structure of the first silencing cavity further filters the fundamental frequency, reducing the noise generated by the fundamental frequency filter.

This application relates to a method, device, and system for suppressing noise from a cable tunnel fan. The method includes: acquiring operating parameters of the fan within the cable tunnel and environmental parameters of the fan's duct; determining the fan's noise frequency and total noise power based on the operating parameters; determining the structural parameters of a silencer device based on the noise frequency, total noise power, and environmental parameters; and installing the silencer device within the duct based on the structural parameters. The silencer device is used to suppress the noise generated by the fan. This method can both reduce fan noise within the cable tunnel and meet the ventilation requirements of the cable tunnel.