413 results about "Acoustic quieting" patented technology

A power tool having one or more sound damping members which reduce sound and / or vibration from one or more parts of a power tool. The sound damping member can reduce sound and / or vibration from static or dynamic parts of a power tool. The sound damping member can reduce noise and / or vibration from one or more rotating or moving parts of a power tool and its housing or internal structure. Methods, means, controls, systems and practices for reducing or eliminating undesired sound from a power tool are disclosed.

Embodiments disclosed herein include a sound attenuating enclosure defining an interior space, formed by a plurality of composite panels. In some embodiments the composite panels include a frame having a plurality of elongate frame members coupled to one another. The frame defines an inner side facing toward the interior space and an outer side facing away from the interior space. Additionally, some embodiments may include an outer skin secured to the outer side of the frame, an inner skin secured to the inner side of the frame, and a foam layer disposed between the outer skin and the inner skin and between at least a pair of the frame members.

A pump piston assembly has a pump cylinder, at least one hollow piston slidably mounted for reciprocating motion in the pump cylinder, the piston having an inner surface of a first diameter and an outer surface of a second diameter, and a liner sleeve of a different material from the piston mounted on the inner or outer surface of the piston with a close or friction fit to the diameter of the piston surface on which it is mounted. The liner sleeve is of an acoustic dampening material which has a lower acoustic frequency than the piston material and is configured to absorb harmonic acoustic vibrations resulting from reciprocation of the piston in the cylinder.

Systems and methods for measuring and controlling fluid flow comprises an orifice plate defining a variable opening, wherein the orifice plate includes an outer assembly comprising a central opening and an inner assembly extending through the central opening. Another embodiment comprises a plurality of blades disposed parallel to each other, wherein the blades are pivotable along its longitudinal axis and include at least one low-flow blade or partial blade and a plurality of high-flow blades The flow device regulates high and very low volumes of fluid with precision, inexpensively, with superior acoustics, reduced energy, a simpler design, and prevents building infiltration. The high turndown device permits use at lower velocities, thereby reducing noise generation and eliminating need for sound-attenuating liners. The high rangeability device combines several part numbers into fewer parts, thereby streamlining product portfolios. Cost benefits associated with the flow device allow equipment to be scaled back 100:1 rather than legacy 4:1, providing energy savings, fewer product variations, simple and more robust applications. The device meets new and old building fresh air, comfort and energy codes. The flow device can be engineered, selected, and sized without sophisticated software programs.

Disclosed are a sound attenuation sleeve for use on a piling during underwater construction and a method of using such a sleeve for attenuating underwater transmission of sound and / or shock waves during underwater pile driving operations.

An air warmer has a housing whereinto is positioned a noise reduction mechanism having a casing that encases a sound reducing structure having a maze like cavity. An axial fan is positioned within the sound reducing structure. In operation, air is drawn into the sound reducing structure by the fan along a first tortuous passage. The air is directed by the fan through another tortuous passage to an air outlet to inflate a convective blanket with an air hose connected to the air outlet. The configuration of the maze like cavity and the material from which the nosie reducing structure is formed reduce the noise generated by the fan. A heater is provided proximate to the air outlet to heat the output air. A filter is provided at the air inlet to filter the ambient air drawn into the warmer.

An acoustic panel is provided that includes a first layer, a perforated second layer, a core and a noise attenuating feature. The core forms a chamber between the first and the second layers. The noise attenuating feature projects partially into the chamber. The noise attenuating feature is formed integral with the first layer, the second layer and / or the core.

A partially prefabricated sound attenuating partition construction, for the construction of partitions in buildings, and other sound attenuating structures. The partition has two panel assemblies of vertical members defining opposite sides thereof, with a hollow interior. The panels are received in upper and lower generally L-shaped receivers mounted to receive the panel assemblies. A sound attenuating curtain of flexible material is supported from one of the panel assemblies. The sound attenuating curtain is spaced from the second of the panel assemblies by a predetermined air space. A sound attenuation acoustical batting insulation mounted on the other panel assembly within the hollow interior, and, a predetermined airspace between the acoustical batting insulation and the sound attenuating curtain.

A sound attenuating baffle device used in a duct receiving a gaseous flow in a flow direction therethrough, includes a baffle casing supported within the duct and a fibrous sound absorbing material occupying the hollow interior of the baffle casing. One or more perforated sheet members at least partially defines the exterior of the baffle casing across which the gaseous flow of the duct is arranged to be directed. A liner sheet of a non-eroding, sound absorbing foam material is supported within the hollow interior of the baffle casing against an interior surface of the perforated sheet member(s) so as to span across each of the perforations and prevent direct communication of the fibrous sound absorbing material with the perforations to prevent erosion of the fibrous sound absorbing material into the gaseous flow through the duct.

The invention discloses an anti-seismic and sound-absorbing electrical control cabinet, which comprises an outer shell and an inner shell. The bottom of the outer shell is provided with a base and an adjustment groove. The base is provided with a moving mechanism. Adjusting the threaded hole, a buffer mechanism is provided in the adjusting groove, and a pressing mechanism is provided in the adjusting threaded hole; the buffering mechanism includes a fixed column, a sliding column and a second spring, and a right-angle stop is provided on the sliding column. plate, the fixed column is provided with a clamping plate, and the fixed column is provided with a fixed nut; the pressing mechanism includes a pressing column and an elastic pad, and the pressing column is provided with a bolt, and the bolt is provided with a There are locking nuts; sound insulation cotton is arranged between the inner shell and the outer shell. The device adopts a double-layer cabinet, and the inner shell is buffered and protected by the buffer mechanism and the pressing mechanism between the outer shell and the inner shell. The buffer effect is good, the adaptability is strong, and the inner shell of different sizes can be installed. Adapt to different vibration environments.

A roller tube comprising a tube body which defines on its outwardly facing surface one or more blind substrate or shutter substrate receiving portions, wherein the tube body includes a plurality of sound damping elements located circumferentially around its inwardly facing surface, the sound damping elements extending longitudinally along at least part of the length of the tube body and defining a plurality of sound channels inside the tube.

The invention discloses a muffling structure which comprises more than two layers of resonant film materials. The adopted film is soft, uneven in surface and has airflow barrier. The surface of the film is uneven on the basis of the soft film, so that the absorption peak of the resonant structure deflects to the low frequency, the absorption of the low frequency is promoted; and moreover, when the medium-high frequency sound is incident from different angles, the sound waves have a chance to reflect on the surface of the film repeatedly; and therefore, the opportunity that the sound waves pass through the airflow barrier film is greatly increased, the strong reflection of the smooth airflow barrier film on the medium-high frequency sound is avoided, most of the medium-high frequency sound can enter the structure to be absorbed, and the absorption of the medium, high and low-frequency sound is considered.

The invention belongs to the technical field of noise reduction equipment, and particularly discloses a resistive muffler comprising sound inlet tubes, a sound muffling tube, an air outlet tube, a blocking cover and a dust screen. The blocking cover is provided with installing holes used for installing the sound inlet tubes. There are multiple sound inlet tubes which are trumpet-shaped. The small-diameter ends of the sound inlet tubes are installed on the installing holes of the blocking plate. The sound muffling tube is frustum-shaped. The large-diameter end of the sound muffling tube is detachably connected with the blocking cover. The dust screen is installed on the blocking plate of the connecting part of the sound muffling tube and the blocking plate. The tube body of the sound muffling tube comprises an external tube cavity and an internal tube cavity. The external tube cavity is filled with noise reduction balls. The internal tube cavity is filled with sound muffling material. The air outlet tube is communicated with the small-diameter end of the sound muffling tube. Compared with mufflers in the prior art, outdoor application of the resistive muffler is realized, and effective absorption processing of noise of high, medium and low frequency sound wave is also performed.

The invention discloses a supporting noise reduction system for a combustion gas turbine mobile power station, and relates to the technical field of prevention of noise pollution. The system comprisesa sound insulation box body used for mounting a combustion gas turbine, wherein the bottom of the sound insulation body is fixedly mounted on a suspending body frame through a sound attenuation system underframe, and wheels are mounted at the bottom of the suspending body frame; an inlet gas sound attenuation system is connected to one end of the sound insulation box body, and an intake air soundattenuation system is arranged above the inlet gas sound attenuation system and communicates with a gas inlet of the sound insulation box body; and a first-stage exhaust sound attenuation system is arranged at the top of the other end of the sound insulation box body, a second-stage exhaust sound attenuation system is mounted at the top of the first-stage exhaust sound attenuation system, and thefirst-stage exhaust sound attenuation communicates with an exhaust port of the sound insulation box body. According to the supporting noise reduction system for the combustion gas turbine mobile power station, noise produced by the combustion gas turbine during working is reduced, and the working environment is protected.

The invention provides a directional sounding device and method and AR equipment. The directional sounding device comprises a main loudspeaker used for sounding and a silencing loudspeaker; the frequency of sound waves emitted by the silencing loudspeaker is the same as that of sound waves emitted by the main loudspeaker, and the phase of the sound waves emitted by the silencing loudspeaker is opposite to that of the sound waves emitted by the main loudspeaker in the silencing direction. According to the directional sounding device, the main speaker is arranged for sounding, and the silencingloudspeaker is arranged, the silencing loudspeaker points to the silencing direction; the sound attenuation loudspeaker and the main loudspeaker emit sound waves with the same frequency, and the soundattenuation loudspeaker and the main loudspeaker emit sound waves with opposite phases in the sound attenuation direction, so that the sound attenuation loudspeaker in the sound attenuation directioncan weaken or offset the sound waves emitted by the main loudspeaker, and then sound is emitted only in the specified direction to realize directional sound emission.

The invention relates to a vane cell pump comprising an electrical pump unit that has a pump chamber into and out of which a fluid can flow and also a rotor with a number of vanes to compress the fluid before flowing out from the pump chamber. The vane cell pump also comprises a sound-damping mechanism into which the fluid can flow after flowing through the pump chamber and that has a sound-damping cover attached to a part of the pump chamber and defining a sound-damping volume. A preliminary sound-damping mechanism with at least one preliminary sound-damping outlet from which the fluid can flow may be arranged within the sound-damping volume, wherein the preliminary sound-damping outlet has a cross-sectional profile tapering in the direction of fluid outflow.

The invention discloses a building block and a construction process thereof. The building block comprises a plurality of groups of building block structures which are sequentially arranged in the horizontal direction and movably piled in the vertical direction. Each building block structure is formed by movably assembling and connecting a first building block and a second building block which aresymmetrically arranged, after the first building block and the second building block are assembled, a sound insulation cavity is formed in the middle of the first building block and the second building block, and the sound insulation cavity refracts sound waves through a first reinforcing rib and a second reinforcing rib which are arranged on the first building block and the second building blockrespectively. The construction process comprises the following steps that (1) line snapping is conducted, and steel bars are well distributed; 2) the block structures are spliced and sleeve reinforcing steel bars; 3) a connecting gasket is placed between adjacent building block structures; 4) adjacent layers are arranged in a staggered manner; and 5) concrete slurry is poured, and concrete slurryis smeared between the first building blocks and the second building blocks. The building block structure has the advantages that the building block structure is high in structural strength, good in silencing effect, convenient to position and simple in construction process, and the building block structure has good construction efficiency on the basis that precision is guaranteed.

The invention discloses a ventilation noise-insulation window comprising a window body. An active noise-reduction ventilator is arranged on the window and comprises a ventilation channel; a high-frequency noise elimination device, a low-frequency noise elimination device and a fan used for increasing the air circulating rate are arranged on the ventilation channel; the low-frequency noise elimination device comprises a low-frequency noise elimination cavity; and a sound wave generator is arranged on the low-frequency noise elimination cavity. Noise transmitted from the outside environment canbe lowered while large-flow ventilation of a room can be achieved; especially, the low-frequency noise smaller than 300 Hz, not easy to attenuate and high in penetrability is controlled effectively, and lowering of the low-frequency radiation noise is achieved; when the window is closed, the overall noise-insulation amount of the window is 35-40 dB and reaches the fourth grade (GB / T8485-2000) of the noise-insulation performance of building door-windows.

The invention discloses a sound insulation and noise reduction method and device for an MVR energy saving vaporization system. A lobed rotor compressor is subjected to sound insulation and noise reduction through a sound insulation cover formed by combining reinforcing ribs, a sound insulation layer, a damping layer and a sound absorption layer, and natural negative pressure heat dissipation is conducted on the sound insulation cover; noise in the sound insulation cover is absorbed through a sound absorption layer of a composite sound absorption and insulation steel plate at first and then secondarily absorbed through a damping layer of the composite sound absorption and insulation steel plate, and after being insulated and weakened, the noise enters a silencer to be subjected to sound attenuation and then is emitted out of a room; a combined heat preservation sound insulation noise reduction material composed of rock wool, a damping material body, a sound-proof felt and an aluminum sheet is applied to a horizontal heat exchanger so that sound reflection can be reduced, that is, reverberation in the sound space can be avoided, and the strength of pipeline vibration radiating outwards is reduced, vibration produced due to the fact that a pipeline is rubbed by gas is inhibited, the situation that a large amount of sound energy is consumed is avoided, and the noise level is decreased; and meanwhile, the influence of inhibiting and weakening resonance and being consistent with response is achieved. According to the sound insulation and noise reduction method and device for the MVR energy saving vaporization system, the noise which is more than three meters away from the device is reduced to 70 dB or less from 110 dB, and plant boundary noise is reduced to 60 dB or less.

The present application provides a touch display panel, a method for producing the same and a display apparatus. The touch display panel includes a liquid crystal screen and a protection cover plate covered at a light exiting side of the liquid crystal screen. The touch display panel further includes a sound elimination membrane, located at the light exiting side of the liquid crystal screen, and configured to eliminate sound waves generated when the touch display panel is touched. With the provision of the sound elimination membrane, the touch display panel can eliminate the vibration sound waves generated during the knocking touch process, and avoid the alignment difference of the liquid crystal molecules by the vibration sound waves, thereby avoiding a display mura caused by the vibration sound waves and further significantly suppressing the display mura generated during the knocking touch process.

The invention relates to a sound attenuation and noise reduction device applied to an air duct. The sound attenuation and noise reduction device includes a flexible joint and a muffler. Flange piecesare arranged at both ends of the flexible joint and the muffler. A pipe at the original air duct is cut and removed, and the flange pieces are installed at pipe orifices by welding. The flange piece at one end of the flexible joint is connected with the flange piece on the end part of the pipe on one side, and the flange piece at the other end of the flexible joint is connected with the flange piece at one end of the muffler. The flange piece at the other end of the muffler is connected with the flange piece on the end part of the pipe on the other side. The sound attenuation and noise reduction device can realize arbitrary combination, disassembly and installation. Meanwhile, the sound attenuation and noise reduction device can be quickly connected and installed with the pipes at any desired position in an original pipeline. Through the installation of the sound attenuation and noise reduction device in the middle of the existing pipe, the impact of vibration generated during the operation of the air duct on existing surrounding structures can be efficiently and safely reduced, the decibel value of noise generated during the operation is reduced, and it is ensured that the factoryboundary noise meets the standard.

The invention discloses an improved self-pretightening rotary shaft assembly. The improved self-pretightening rotary shaft assembly comprises a first supporting base, a spring, a sound removal pipe, asupporting base limiting cover, a fixed shaft, an aluminum pipe, a second supporting base and a locating pin, wherein it is required that the inner diameter of the spring is in interface fit with supporting pillars of the first supporting base and the supporting base limiting cover, and it is prevented that the friction in the running process of the improved self-pretightening rotary shaft assembly causes abnormal sounds. By means of the improved self-pretightening rotary shaft assembly, by controlling the thickness and the material rigidity of the sound removal pipe, bumping is buffered to the greatest extent, and the noise decibel value is reduced. In the whole assembly procedure, except riveting anti-backing riveting points which need tool clamps, other assembly procedures all can be manually completed. The improved self-pretightening rotary shaft assembly is simple in structure, has few parts, and is simple in assembly technology, and the production efficiency is improved by 100%or above.

The invention discloses a ceiling type indoor air purifier. The air purifier structurally comprises an LED lamp, an air outlet, a display screen, a telescopic rod, a connecting plate, a noise reduction device, a sweeping device, a primary filter screen, an HEPA efficient filter screen, an activated carbon filter screen and a machine body. According to the invention, when purification is carried out after improvement, vibration generated by air purification is reduced through cooperation of the protection damping blocks and the damping springs, most of generated noise is efficiently blocked through the silencing net plate and the sound insulation net plate auxiliary silencing cover, sound generated by operation of the air purifier is eliminated, and the use effect of the air purifier is improved; after air is purified, the brush is driven by the sliding block to rotate, dust particles on the filter screen are swept, then the dust suction piece is used in cooperation with blades for dustsuction treatment, swept dust is sucked into a dust collection cavity through a connector, dust in the air purifier is removed, and the practicability of the air purifier is improved.

Embodiments described herein are directed to a sound-dampening baffle and lighting apparatus and methods of production therefor. In one embodiment, a sound-dampening baffle and lighting apparatus is provided that includes a structural frame which provides support for a sound-dampening outer layer and a light source. The sound-dampening outer layer is disposed around the structural frame. The sound-dampening baffle and lighting apparatus also includes a light source disposed on the structural frame. The light source is directionally switchable so that light emanating from the light source points upward, downward or both.

The invention discloses a noise reduction device and a gas water heater. The noise reduction device comprises a bucket-shaped body, wherein the bucket-shaped body is defined by connecting a circumferential wall and a bottom wall, and one end of the bucket-shaped body is open. The circumferential wall comprises an inner circumferential wall and an outer circumferential wall. An air inlet channel isdefined by the middle of the inner circumferential wall. A gap is formed between the inner circumferential wall and the outer circumferential wall. A cavity is divided by first partition plates intomultiple sound attenuation cavities, at least one second partition plate is arranged in each sound attenuation cavity, each sound attenuation cavity is divided by the corresponding second partition plates into multiple layers of sub sound attenuation cavities, and the sub sound attenuation cavities are independent of each other. The second partition plates are perpendicular to the first partitionplates, and each sub sound attenuation cavity is provided with at least one sound inlet. The noise reduction device effectively absorbs noise entering the structure, and therefore sounds are effectively prevented from being leaked from the structure; and through inner structural design, sound absorption and noise reduction for different frequencies can be achieved, and noise spreading out from a box can be effectively reduced. In addition, the noise reduction device basically has no influence on the wind quantity and wind pressure, and the wind inlet quantity cannot be influenced.

The invention discloses a sound attenuation plate capable of absorbing noise. The sound attenuation plate comprises a plate body. Sound attenuation holes are formed in the plate body and comprise sound wave inlets and sound wave outlets which are connected with the sound wave inlets and have large cross sections. The sound wave inlets are located in rims of the sound wave outlets. Sound wave baffles which are identical with the sound wave outlets in terms of shape and size are arranged at the sound wave outlets and arranged on the edges of the sound wave outlets through columns. When noise waves enter the sound wave inlets, the noise waves are compressed by the walls of the sound wave inlets. When the sound waves enter the sound wave outlets, the sound waves rapidly expand, the majority of the sound wave energy of noise is converted into heat energy, the rest of the noise waves are emitted from exit places of the sound wave outlets and encounter the sound wave baffles which are arranged by facing the sound wave outlets. The remaining sound waves are rebounded to the sound wave outlets and coincide with the rest of the noise sound waves emitted from the sound wave outlets. The sound waves which are identical with frequencies and adverse in phases are counteracted, so that the noise is thoroughly eliminated.

The invention relates to the technical field of airflow sound elimination, and discloses a novel micro-perforated plate muffler with barbed triangular micro-perforation. The micro-perforated plate muffler includes a shell, the shell internally sleeves two micro-perforated plates in a sealed mode through a sealing tape, the two micro-perforated plates are mutually symmetrical with the center line of the vertical direction of the shell as the axis of symmetry, the left side and the right side of the inner wall of the shell sleeve an air outlet pipeline and an air inlet pipeline correspondingly,and the right end of the air inlet pipeline penetrates through the shell and extends to the right side of the shell. According to the novel micro-perforated plate muffler with barbed triangular micro-perforation, a clockwise thread and a counterclockwise thread with opposite grains are formed in a distance adjusting device, a user conveniently and simultaneously adjusts and controls the distance between the two micro-perforated plates and the adjacent side of the shell according to the volume of a noise source and the audio frequency, by adjusting and controlling the depth of an inner cavity,noise and audio with different sizes are silenced conveniently, and the applicability of the novel micro-perforated panel muffler to noise reduction of different volume and different audio frequency is improved.