40results about How to "Effective noise reduction effect" patented technology

The invention discloses a range hood with gesture control and visual detection functions, and a noise reduction method thereof. The range hood is provided with a range hood main body, a three-dimensional space sound field noise reduction device for active noise reduction, and a visual detection system, the visual detection system is assembled on the range hood main body, and the three-dimensionalspace sound field noise reduction device is assembled in the range hood main body. The range hood decomposes a noise signal into multiple sub-band signals, the sub-band signals are converted to obtainband pass filter weight vectors, the obtained band pass filter weight vectors are converted to generate corresponding loudspeaker sound fields, the equal-intensity sound wave signals are transmittedto corresponding loudspeakers, and sound waves generated by the corresponding loudspeakers can reduce or offset noise sound waves generated by the range hood in order to realize noise reduction. The range hood overcomes the technical difficulty of mutual contradiction between noises and performances, and realizes small noises generated during the running of the range hood and no physiological andmetal negative influences on users without sacrificing the performances of the range hood.

The invention discloses a kitchen ventilator with an oil-smoke separation device and a noise reduction device and a noise reduction method. The kitchen ventilator comprises a kitchen ventilator body,the three-dimensional space sound field noise reduction device for active noise reduction, and the oil-smoke separation device for absorbing and separating lampblack particles. The three-dimensional space sound field noise reduction device is assembled into the kitchen ventilator body. The oil-smoke separation device is assembled into the kitchen ventilator body in a driving mode.The three-dimensional space sound field noise reduction device is provided with a noise collection sensor and a noise reduction body. The noise collection sensor is used for detecting decibel of noise sources in the kitchen ventilator body. The noise reduction method includes the steps of decomposing a noise signal into multiple sub-band signals, acquiring a band-pass filter weight vector through conversion, converting the acquired band-pass filter weight vector into a corresponding loudspeaker sound field, transmitting a constant-strength sound wave signal to a corresponding loudspeaker, and reducing or eliminating noise waves generated by the kitchen ventilator through sound waves generated by the corresponding loudspeaker to reduce noise. The kitchen ventilator has the advantages that the technical problem of conflict between the noise and performance is solved, and on the premise of not sacrificing lampblack suction performance of the kitchen ventilator, the noise generated during operation of thekitchen ventilator is low and does not cause negative influence on users physiologically and mentally.

The invention discloses a roadbed edge protection device with a noise reduction function for highway construction. The roadbed edge protection device comprises a first combined protection main body, abuffer anti-collision plate, a second combined protection main body, a buffer frame, a small water pump, a mounting sleeve, a filter cover, a buffer spring and a transmission spiral shaft, and the first combined protection main body is combined and connected with the second combined protection main body through a connecting shaft fixedly mounted on the outer wall of one side of the first combinedprotection main body; according to the invention, an anti-collision mechanism is mounted on the outer part; a buffer rod of the anti-collision mechanism can directly relieve the impact force of collision; meanwhile, a part of impact force is also dispersed to a buffer spring in the mounting shell; the anti-collision mechanism can buffer impact force in the horizontal direction and the vertical direction at the same time, a good anti-collision effect is achieved, a fixing shaft with the extrusion spring is installed outside the anti-collision mechanism, if the anti-collision mechanism is damaged in the using process, the fixing shaft can be directly pulled down, taking and installing are convenient, the overall protection device does not need to be replaced, and the device is practical.

The invention discloses a low-damping half-surrounded three-dimensional sound field noise reduction range hood and a noise reduction method thereof. The range hood is provided with a range hood main body and a three-dimensional space sound field noise reduction device, and the three-dimensional space sound field noise reduction device is assembled in the range hood main body. The low-damping half-surrounded structure of the range hood makes incoming waves and reflected waves have different phases at a specific distance to a reflection plane in order to mutually offset sound waves of noises, sothe intensity of the noises is reduced. The arrangement of a three-dimensional space sound field noise reduction unit and a self-adaption three-dimensional space sound field noise reduction control unit ensures that the range hood works under optimal performance conditions while achieving low noises, so the technical difficulty of the mutual contradiction between noises and performances is solved, low noises during running of the range hood and no physiologic and mental negative influences on users are achieved without sacrificing the smoke suction performance of the range hood, and a most effective noise reduction effect and an effective noise reduction space range are obtained.

A urinal is sequentially provided with a first flushing layer, a second flushing layer and a third flushing layer from top to bottom, and a height difference exists between every two adjacent flushing layers; a first flushing port is formed in the rear portion of the urinal and flushes water on the surface of the first flushing layer to form a first flushing track, a second flushing port is formed in the rear portion of the urinal and located in the third flushing layer, and water flushed outwards from the second flushing port enters the second flushing layer from the third flushing layer from bottom to top. The water body moves along the surface of the second flushing layer and then enters the surface of the third flushing layer to form a second flushing track, the tail end of the first flushing track and the tail end of the second flushing track are at least partially overlapped, and the tail end of the second flushing track is connected with a drain outlet in the bottom of the urinal. According to the technical scheme, the toilet bowl has the advantages of being clean in flushing, sufficient in pollution discharge and the like, the urinal structure of the toilet bowl can be effectively optimized and improved, and the effects of sufficient pollution discharge and efficient cleaning are achieved.

The invention discloses a noise reduction device and exhausting assembly linked range hood, and a noise reduction method thereof. The range hood is provided with a range hood main body, an exhaustingassembly and a three-dimensional space sound field noise reduction device for active noise reduction, and the exhausting assembly and the three-dimensional space sound field noise reduction device arerespectively assembled in the range hood main body. The exhausting assembly is in linkage connection with the three-dimensional space sound field noise reduction device. A noise signal is decomposedinto multiple sub-band signals, the sub-band signals are converted to obtain a band pass filter weight vector, the obtained band pass filter weight vector is converted to generate a corresponding loudspeaker sound field, the equal-intensity sound wave signal is transmitted to a corresponding loudspeaker, and sound waves generated by the corresponding loudspeaker can reduce or offset noise sound waves generated by the range hood in order to realize noise reduction. The range hood overcomes the technical difficulty of mutual contradiction between noises and performances, and realizes small noises generated during the running of the range hood and no physiological and metal negative influences on users without sacrificing the performances of the range hood.

The invention discloses a damp-proof and noise-reducing electrical control cabinet, which comprises a cabinet body, wherein a cabinet door is installed on one side of the cabinet body through a hinge, noise reduction assemblies are movably arranged on the two sides of the cabinet body, a moisture-proof assembly is arranged in the middle of the top end of the cabinet body, multiple sets of installation frames which are vertically distributed at equal intervals are fixedly installed in the cabinet body through screws, and a cooling plate is fixedly clamped in the middle of the installation frame. According to the invention, by arranging the moisture-proof assembly, external air is subjected to water absorption treatment through moisture-proof beads, so that the water content of the external air is effectively reduced so as to prevent the moisture-proof effect of the interior of the cabinet body from being affected by moisture of the external air; the processed external air enters a fan through multiple groups of through grooves and enters the cabinet body to blow and dry the interior of the cabinet body, and can perform air body cooling on electrical equipment, and the internal air body is blown out of the outer side of the electrical control cabinet from the bottom end of the cabinet body through multiple groups of air outlet holes in an air outlet plate, so that the moisture-proof effect of the whole electrical control cabinet is effectively improved.

The invention relates to a fuel gas pressure regulating box. The box comprises a main body framework. The main framework comprises a bottom frame, vertical columns distributed at intervals are fixed to the four sides of the bottom frame, a top cover assembly is installed on the upper side of the main framework, and end plate assemblies are installed at the two ends of the main framework respectively. Side door assemblies are arranged between every two adjacent vertical columns on the two sides of the main framework respectively, and each side door assembly comprises a door lintel, a door frameand a door body. Each door body comprises a side frame, a door plate and a sound insulation plate, wherein the door plate and the sound insulation plate are fixed to the side frame at an interval, aventilation hole is formed in the upper half portion of the door plate, a first sound absorption plate is arranged on the side, opposite to the sound insulation plate, of the door plate, the top of the first sound absorption plate is lower than the ventilation hole, a gap is reserved between the bottom of the sound insulation plate and the bottom edge of the side frame, a second sound absorption plate is arranged on the side, opposite to the door plate, of the sound insulation plate, a gap is reserved between the second sound absorption plate and the first sound absorption plate, and a third sound absorption plate is arranged on the other side, opposite to the door plate, of the sound insulation plate. The pressure regulating box has the advantages of being simple in structure, small in occupied space, good in ventilation effect, high in noise reduction capability and high in safety.

The invention relates to an airflow control means, in particular for a motor vehicle heating, ventilation and / or air-conditioning system with an air flap (20) arranged in an air duct with first surface sections (11, 12, 13, 14, 21, 22, 23, 24) for mutual engagement and second surface sections (17, 26, 27), which do not engage with each other, whereby surface structure elements (28) are embodied on at least one second surface section (27).

The invention relates to the technical field of refrigeration equipment, and discloses a noise reduction and air supply device for a refrigeration display cabinet, the noise reduction and air supply device comprises a goods shelf bottom box, an air inlet is formed in the top of one side of the goods shelf bottom box, an air supply duct is formed in the other side of the goods shelf bottom box, and a motor set is movably mounted in an inner cavity of the goods shelf bottom box. By arranging the fan blades and the air increasing bag, on the basis of an existing motor set, the fan blades and the air volume capable of being sucked by the fan blades, a certain ventilation quantity is increased for the inner cavity of the goods shelf bottom box, by arranging the blocking plate, kinetic energy of air flow is consumed through impact, the air flow speed is reduced, and the effective noise reduction effect is achieved; the heat conduction between the noise reduction clamping plate and the barrier plate is utilized to heat the air flow circulating in the air outlet, so that the temperature of the air circulating in the inner cavity of the goods shelf bottom box is further improved, the frosting degree of the surface of the evaporator is effectively reduced, and the frosting period is shortened.

The invention discloses a plastic granulating and screening all-in-one machine for a plastic modification process. The plastic granulating and screening all-in-one machine comprises an all-in-one machine body, a screen, a first discharging port, a fastening screw, a partition plate, a second discharging port, a third discharging port, a frame, a double-layer air suction port, a cross beam, a monitoring mechanism, a noise reduction device, a feeding port, an operation button, a granulating cavity, a movable sliding plate, a pull ring, a transparent liquid bin, a sound insulation plate and sound absorption cotton, wherein the screen is arranged in the all-in-one machine body, the second discharging port is formed in one end of the screen, the first discharging port is formed in one side of the second discharging port, the third discharging port is formed in the other side of the second discharging port, the partition plate is arranged at the top of the second discharging port, and the fastening screw is arranged at the top of the partition plate. Dust and other impurities in plastic particles can be sucked away through the double-layer air suction port, so that the cleanliness of the particles is guaranteed, the particles can be conveniently screened in the screen, and the working efficiency of the granulating and screening all-in-one machine is improved.

The invention discloses a one-way sound-absorbing wall filling material, which belongs to the field of noise reduction and environmental protection. The one-way sound-absorbing wall filling material can be arranged by a plurality of conch-shaped two-way sound tubes, and the sound can be reduced from the inside to the outside. It is conducted from the thick end to the thin end, and the inner diameter of the thin end is larger, which can play a better sound amplification effect. At the same time, from the outside to the inside, the sound is conducted from the thin end to the thick end, so that the sound passes through many times. The inner wall of the thin end and the thick end is reflected to achieve an effective noise reduction effect. At the same time, with the function of the semi-sound insulation board, it can achieve the effect of different sound insulation between indoor and outdoor, thereby effectively improving the application range of this sound insulation material, so that people in the room can be protected from the outside world. At the same time as the noise is disturbed, people outside can detect the movement in the room in time, thereby improving the rest quality of people indoors, and at the same time reducing certain safety hazards.

The invention relates to an audio noise filtering system, which is provided with a mobile terminal and comprises a first audio acquisition module used for acquiring a noise value of an environment where the mobile terminal is located; a second audio acquisition module used for acquiring a target audio of a target sound source; and an audio processing module electrically connected with the first audio acquisition module and the second audio acquisition module, and used for acquiring the noise value and the target audio, comparing the target audio with the noise value, and removing the audio with the same noise value in the target audio. According to the audio noise filtering system, the noise value is independently recorded and compared with the target audio, so that the purpose of removing the noise value in the target audio is achieved, and the effective noise reduction effect is achieved.

The invention provides a tread pattern and a tire. The tread pattern comprises a plurality of main grooves which are parallel to each other. The main grooves extend circumferentially along the tread and surround the tire. The groove wall of the main groove is a curved surface. A plurality of the main grooves are symmetrically distributed on the tread. The invention also includes the tire using theabove pattern. The pattern and the tire have good handling performance, drainage performance and silence performance.

The invention relates to the technical field of production and manufacture of boiler accessories, and discloses a silencer for a steel plant boiler. The silencer for the steel plant boiler comprises ashell, wherein a gas inlet is formed in the bottom of the shell, gas and noise generated in the boiler enter the shell through the gas inlet, the gas and noise are subjected to primary silencing on asilencing ring after being relatively cooled by a cooling plate, and then secondary and tertiary silencing are carried out on a silencing cylinder and a silencing pad to finish the silencing work ofthe boiler. Due to the fact that an air outlet arranged at the top of the shell faces upwards, dust often falls into the air outlet, the falling dust flows to dust collecting plates on the two sides after being shunted by a shunt cone, the falling dust enters the interior of the dust collecting plates from dust collecting nozzles at the tops of the dust collecting plates, and then the dust is conveyed into a dust collecting box through the vibration of sliding plates and the dust collecting plates. The silencer for the steel plant boiler is simple in structure and easy to operate, effectivelyprevents dust from falling into the silencer and has the efficient dustproof effect.

The invention discloses a range hood with a detachable three-dimensional space sound field noise reduction device, and a noise reduction method thereof. The range hood is provided with a range hood main body and the detachable three-dimensional space sound field noise reduction device for active noise reduction, and the detachable three-dimensional space sound field noise reduction device is assembled in the range hood main body. A detachable error return sensor dismounted from the range hood in the late noise reduction stage does not affect the noise reduction effect and saves the cost. The range hood decomposes a noise signal into a plurality of sub-band signals, the sub-band signals are converted to obtain band pass filter weight vectors, the obtained band pass filter weight vectors areconverted to generate corresponding loudspeaker sound fields, the equal-intensity sound wave signals are transmitted to corresponding loudspeakers, and sound waves generated by the corresponding loudspeakers can reduce or offset noise sound waves generated by the range hood. The range hood overcomes the technical difficulty of mutual contradiction between noises and performances, and realizes small noises generated during the running of the range hood and no physiological and metal negative influences on users without sacrificing the smoke suction performance of the range hood.

The invention discloses a range hood with an inferior three-dimensional space sound field noise reduction device, and a noise reduction method thereof. The range hood is provided with a range hood main body and the inferior three-dimensional space sound field noise reduction device for active noise reduction, and the three-dimensional space sound field noise reduction device is assembled in the range hood main body. A noise signal is decomposed into multiple sub-band signals, the sub-band signals are converted to obtain band pass filter weight vectors, the obtained band pass filter weight vectors are converted to generate corresponding loudspeaker sound fields, the equal-intensity sound wave signals are transmitted to corresponding loudspeakers, and sound waves generated by the corresponding loudspeakers can reduce or offset noise sound waves generated by the range hood in order to realize noise reduction. The arrangement of a low-damping full sounded or half surrounded structure and aself-adaption function of the range hood achieves the optimization of the performances of the range hood, completes working under low-nose running conditions, and solves the technical difficulty of the mutual contradiction between noises and performances, and low noises generated during running of the range hood and no physiologic and mental negative influences on users are achieved without sacrificing the smoke suction performance of the range hood.

The invention provides a phononic crystal sound barrier with a self-adaptive function. The phononic crystal sound barrier comprises scatterer tubes capable of adjusting the size of a resonant cavity, a sensor, a controller, a driver, an actuator, two stepping push rods, a control panel, a connecting plate and a connecting mechanism of the scatterer tubes. The scatterer in the phononic crystal sound barrier provided by the invention can pick up an audio signal of noise by a sound pick-up according to different main noise frequency bands and transmit the audio signal to a single-chip microcomputer; corresponding noise reduction pulses generated by the single-chip microcomputer act on a stepping motor to drive the stepping motor to rotate, so that the stepping push rods drive the control panel to move, and the inclination degree of each base cotyledon is changed; and then the frequency range of the band gap of the scatterer is changed through the outer diameter of a hinge scatterer and a resonant cavity, so that the band gap frequency band of the scatterer corresponds to the maximum noise amplitude frequency band, the noise environment can be automatically adapted, effective reflection and absorption attenuation of the sound barrier on different noise frequency bands are remarkably enhanced, the effect is good, and noise reduction is more targeted.

The invention discloses a Hilbert transformation noise reduction range hood and a noise reduction method thereof. A noise signal is decomposed into multiple sub-band signals, the sub-band signals areconverted to obtain band pass filter weight vectors, the obtained band pass filter weight vectors are converted to generate corresponding loudspeaker sound fields, the equal-intensity sound wave signals are transmitted to corresponding loudspeakers, and sound waves generated by the corresponding loudspeakers can reduce or offset noise sound waves generated by the range hood in order to realize noise reduction. The arrangement of a low-damping full sounded or half surrounded structure and a self-adaption function of the Hilbert transformation noise reduction range hood achieves the optimizationof the performances of the range hood, completes working under low-nose running conditions, and solves the technical difficulty of the mutual contradiction between noises and performances, and low noises generated during running of the range hood and no physiologic and mental negative influences on users are achieved without sacrificing the smoke suction performance of the range hood.

The invention relates to the technical field of chemical treatment devices, and discloses a treatment device applied to a methane chloride waste alkali liquid. The treatment device comprises a devicebody and a base, wherein a connecting plate is fixedly mounted at the bottom of the device body, sliding blocks are fixedly mounted on left and right side surfaces of the connecting plate, two symmetrical pulleys are fixedly mounted at the bottom of the device body, a first cavity is formed in the top of the base, two sliding grooves are formed in the inner top wall of the first cavity, sliding rails are fixedly installed on the inner walls of the two sides of the first cavity, the two sliding blocks are connected into the two sliding rails in a clamped mode respectively, two symmetrical fixing blocks are fixedly installed on the inner bottom wall of the first cavity, and first springs are fixedly installed on the side surfaces, close to each other, of the two fixing blocks. According to the invention, the treatment device solves the problems of large size, large noise, poor moving performance and inconvenient use of the existing methane chloride waste alkali liquid treatment device, and achieves the effects of convenient moving, low noise, good moving flexibility and convenient use.

The invention discloses a low-damping full-surrounded three-dimensional sound field noise reduction range hood and a noise reduction method thereof. The range hood is provided with a range hood main body and a three-dimensional space sound field noise reduction device, and the three-dimensional space sound field noise reduction device is assembled in the range hood main body. The low-damping full-surrounded structure of the range hood makes incoming waves and reflected waves have different phases at a specific distance to a reflection plane in order to mutually offset sound waves of noises, sothe intensity of the noises is reduced. The arrangement of a three-dimensional space sound field noise reduction unit and a self-adaption three-dimensional space sound field noise reduction control unit ensures that the range hood works under optimal performance conditions while achieving low noises, so the technical difficulty of the mutual contradiction between noises and performances is solved, low noises during running of the range hood and no physiologic and mental negative influences on users are achieved without sacrificing the smoke suction performance of the range hood, and a most effective noise reduction effect and an effective noise reduction space range are obtained.

The invention discloses a range hood with an oil-resistant three-dimensional space sound field noise reduction device, and a noise reduction method thereof. A noise signal is decomposed into multiplesub-band signals, the sub-band signals are converted to obtain a band pass filter weight vector, the obtained band pass filter weight vector is converted to generate a corresponding loudspeaker soundfield, the equal-intensity sound wave signal is transmitted to a corresponding loudspeaker, and sound waves generated by the corresponding loudspeaker can reduce or offset noise sound waves generatedby the range hood in order to realize noise reduction. The arrangement of a low-damping full sounded or half surrounded structure and a self-adaption function of the range hood with the oil-resistantthree-dimensional space sound field noise reduction device achieves the optimization of the performances of the range hood, completes working under low-nose running conditions, and solves the technical difficulty of the mutual contradiction between noises and performances, and low noises generated during running of the range hood and no physiologic and mental negative influences on users are achieved without sacrificing the smoke suction performance of the range hood.

The invention provides a compressor exhaust structure, a compressor and an air conditioner, including an upper flange, a crankshaft and an upper flange shaft hole; connected, the high-pressure gas in the compression chamber is discharged into the exhaust port; the oil-gas groove is arranged on the inner wall of the shaft hole of the upper flange, and / or the outer wall of the crankshaft; the exhaust port communicates with the oil-gas groove, and the high-pressure gas enters the upper After the flange, it flows through the oil and gas groove and is discharged, and the oil mist in the high-pressure gas lubricates the shaft hole of the upper flange. The compressor exhaust structure of the present invention solves the problem of insufficient lubrication of the upper flange bearing section. The upper flange is lubricated by the lubricating oil dissolved in the exhaust of the compressor, and the supply of lubricating oil is continuous, especially The lubricating effect of the upper flange is better than that of the prior art under low-frequency operating conditions. At the same time, the sound-absorbing cavity is completely closed by the cover body, which can achieve a more effective sound-absorbing effect.

A sound suppressor device for an air drying unit of a compressed-air supply system having a sound suppressor housing on which is arranged an inlet opening for the supply of condensate-laden compressed air to be discharged from the air drying unit and at least one outlet opening for the discharge of the condensate-laden compressed air to the outside, wherein the inlet opening issues into at least one pre-chamber of the sound suppressor housing, which pre-chamber issues into post-chambers which are connected in parallel and which are arranged around a heating rod arranged centrally in the sound suppressor housing.

The invention discloses an exhaust hood which comprises a fan assembly and a silencer. The fan assembly comprises a fan box and a fan arranged in the fan box; the fan box is provided with a wind inletand a wind outlet; an air inlet and an air outlet are formed in two ends of the silencer; the air outlet communicates with the wind inlet; the silencer is provided with a silencing channel and a silencing cavity communicating with the silencing channel; and the air outlet communicates with the silencing channel and / or the silencing cavity. According to the technical scheme provided by the invention, the noise of the exhaust hood is reduced.