| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 181224000 | Sound absorbing ventilating duct or curb (e.g., a/c, heat, air flow type) | 46 |
| 20080223652 | Single Duct Silencing Terminal Unit - An apparatus and method for attenuating the sound generated by a single duct terminal unit in an HVAC (heating, ventilating, and air conditioning) system. The apparatus utilizes internal geometry to minimize noise due to air disturbances and aerodynamic effects within the apparatus. | 09-18-2008 |
| 20080230305 | Sound absorbing structure of electronic equipment - In order to provide sound absorbing structure capable of reducing the noise of electronic equipment while maintaining the cooling capability of the electronic equipment, there is provided sound absorbing structure in which a plurality of penetrating openings are provided by arranging a plurality of acoustic materials having a predetermined shape at predetermined intervals in a flow channel of cooling fluid from a blower, and the plurality of acoustic materials are arranged so that the sound vertically incident on a penetrating plane of the penetrating openings from the blower does not directly go out of the electronic equipment. | 09-25-2008 |
| 20080236939 | Exhaust silencer assembly - An exhaust silencer assembly for use with a gas turbine engine, the exhaust silencer assembly comprising an exhaust duct extension disposed downstream from an exhaust diffuser of the gas turbine engine, and an exhaust silencer disposed downstream from the exhaust duct extension. The exhaust duct extension has a length that is at least about 50% of an inner diameter of the exhaust duct extension. | 10-02-2008 |
| 20080271945 | Fan Powered Silencing Terminal Unit - An apparatus and method for attenuating the sound generated by a fan powered terminal unit in an HVAC (heating, ventilating, and air conditioning) system. The apparatus utilizes internal geometry to minimize noise due to air disturbances and aerodynamic effects within the apparatus. | 11-06-2008 |
| 20090020358 | Air treatment and sound reduction system - A device for reducing sound from an air treatment unit includes, in one embodiment, an air treatment system, including a wall mount HVAC unit with a supply air opening and a return air opening. A supply air sound reducer is provided in communication with the supply air. The supply air sound reducer includes a housing defining a supply interior provided with sound reducing material. The sound reducing material is overlaid with a layer of perforated material. A return air sound reducer is provided in communication with the return air opening. The return air sound reducer includes a housing defining an interior return volume provided with sound reducing material applied to one or more inside surfaces of the interior return volume and a layer of perforated material disposed over the sound reducing material. Mid-structure including sound reducing material is disposed in each of the supply and return air assemblies. | 01-22-2009 |
| 20090032330 | NOISE OPTIMIZED AIR DISTRIBUTOR - An air distributor is provided that includes, but is not limited to a perforated body, insertable at a joint between a first air duct, which extends in one direction, and a second air duct, that extends in a second different direction, to redirect air flowing in the first air duct into the second air duct and to reduce low frequency high volume noise. | 02-05-2009 |
| 20090133957 | Sound attenuating air vent - An device that allows air flow while attenuating sound for the purposes of allowing air to flow between rooms in a structure such as a house or building. The device consists of an air passageway that attenuates sound and covers at each end of the passageway. The covers allow air flow while providing an aesthetically pleasing appearance. Multiple embodiments support pre and post construction scenarios as well access to the interior of the device for cleaning purposes. | 05-28-2009 |
| 20090166126 | Sound-damping air-conducting duct and method for the production of a sound-damping air-conducting duct - A sound-damping air-conducting duct that has at least one exit opening for air, and is provided, in the region of the exit opening, with a lining made of a sound-absorbing material, which lining is surrounded, at least on its outside, by a wall made of plastic, provided with holes, and the lining is attached to this wall, whereby the lining is immediately, preferably directly, connected with the wall, with material fit and/or shape fit, and/or is connected with it in a single work step with the wall that is produced using a primary shaping method. A method for the production of a sound-absorbing air-conducting duct is also provided. | 07-02-2009 |
| 20090183943 | COMPONENT FOR SOUND ABSORPTION AND AIR CONDITIONING - The invention relates to a component for sound absorption and air conditioning ( | 07-23-2009 |
| 20090200103 | SONIC ABSORPTION DEVICE FOR AN AIR PIPELINE OF AN AIRCRAFT, IN PARTICULAR OF AN AIR CONDITIONING SYSTEM OF AN AIRCRAFT - A sonic absorption device for an air pipeline of an aircraft, which sonic absorption device comprises at least one curved pipe section whose respective interior wall is clad with a sound absorption material, wherein within the curved pipe section at least one air guidance means is arranged for a flow optimisation, wherein for further weight-neutral sound absorption the air guidance means arranged within the curved pipe section comprises a microperforation on at least one side surface. | 08-13-2009 |
| 20100044149 | Acoustic Management Of Fluid Flow Within A Duct - Apparatus and methods described herein provide for the management of noise associated with a duct. A sound-dampening apparatus is provided consisting of a duct through which a fluid flows, such as an air duct. A flexuous cord is helically wound around the inner or outer surface of the duct at a pitch corresponding to a selected acoustical frequency range associated with the fluid flow through the duct. | 02-25-2010 |
| 20100078258 | SILENCING EQUIPMENT FOR ELECTRIC DEVICES - Silencing equipment provided with one or more flow channels through which cooling air flows has a flow channel forming member that forms the flow channel, and an acoustic absorbent member that is fixed to the flow channel forming member. A resonance type silencer is formed on a wall surface of the flow channel by providing a cavity for the resonance type silencer in the acoustic absorbent member and an aperture for the resonance type silencer in a portion of the flow channel forming member. The resonance type silencer sets a frequency of noise necessary to be reduced based on a peak frequency of noise generated by a fan. The silencing equipment further has a slide member which slides by a slide mechanism to adjust the area of the top of the aperture. The silencing equipment for electronic devices capable of cooling heat generating sections thereof with air has a small and simple structure and can improve a silencing effect by blowing air. | 04-01-2010 |
| 20100307862 | SOUND ABSORBING SYSTEM FOR ELECTRONIC DEVICE - Disclosed herein is a sound absorbing system used for an electronic device that has enhanced noise reduction capabilities, while maintaining the cooling performance of the device and without increasing the size of the device. | 12-09-2010 |
| 20110005859 | Process for Audible Acoustic Frequency Management in Gas Flow Systems - A sound insulation process comprises (a) providing at least one sound barrier comprising a substantially periodic array of structures disposed in a first medium having a first density, the array comprising at least one row of at least two of the structures, the structures being made of a second medium having a second density that is greater than the first density, the second medium being a viscoelastic medium, an elastic medium, or a combination thereof, and the first medium being a gaseous medium; and (b) placing the at least one sound barrier in at least one at least partially enclosed gas stream in a manner such that the row of structures extends in a direction that is perpendicular to the direction of flow of the gas stream. | 01-13-2011 |
| 20110061967 | SOUND ATTENTUATOR - An apparatus and method for attenuating the sound generated by a fan powered terminal unit or other equipment in an HVAC (heating, ventilating, and air conditioning) system is described. The apparatus utilizes internal geometry to minimize noise due to air disturbances and aerodynamic effects within the apparatus. Specifically, a silencer is described comprising a casing having an inlet and an outlet; a condensate deflector positioned at the inlet to the casing; at least one baffle being operable to attenuate noise in a gas flowing through the silencer; and an air pathway through the silencer, defined by positions of the condensate deflector and the at least one baffle within the casing. The air pathway is angled or curved to substantially minimize the line-of-sight pathway from the inlet to the outlet. | 03-17-2011 |
| 20110061968 | Sound Attenuator for Low Frequencies, Method for Manufacturing Sound Attenuator for Low Frequencies and System for Attenuating Low Frequencies for Example In Air-Conditioning Ducts of Paper Mills - A sound attenuator for low frequencies in an air-conditioning duct of paper mills includes a sound attenuator frame insertable in the air-conditioning duct. At least one attenuator member operating according to the plate resonator principle has a first resonator plate, a framework, whereto the first resonator plate is attached by its inner surface, and a second plate, which is essentially parallel to the first resonator plate. The second plate is attached to the framework by its inner surface, whereby the second plate, the framework and the first resonator plate delimit at least one attenuator unit. The first resonator plate, attached to the framework, is a steel plate and is attached to the framework by laser welding and the framework comprises a pressure balancing opening. | 03-17-2011 |
| 20110079462 | MUFFLING DEVICE - A muffling device has a muffling piece that is placed in an airflow path and muffles sound caused by airflow, and a drive unit that performs one of rotation and movement of the muffling piece. | 04-07-2011 |
| 20110088966 | SILENCER APPARATUS WITH DISPOSABLE SILENCER CARTRIDGE UNIT - A silencer apparatus for attenuating noise in gas flow systems. The apparatus generally includes a housing having an interior cavity and a gas flow inlet and outlet that are adapted to be connected to a passage such that a gas flowing through the passage enters and exits the cavity of the housing through the inlet and outlet, respectively. A silencer cartridge unit is removably disposed within the interior cavity of the housing and defines a gas flow path fluidically connected to the inlet and outlet of the housing. The silencer cartridge unit has at least one sound-attenuating element that surrounds the gas flow path. The housing is further equipped with a closure that sealingly closes a portion of the housing, and is releasable from the housing to provide an access opening through which the silencer cartridge unit can be removed. The apparatus can also be adapted to include a filtration medium. | 04-21-2011 |
| 20110127106 | ASPIRATOR WITH INTEGRAL MUFFLER - An aspirator with an integral muffler includes a housing having a top, a bottom and a side and an aspirator chamber and a muffler chamber in the housing. The aspirator chamber includes an inlet, an outlet and a venturi section between the inlet and the outlet, and the muffler chamber has an outlet and an inlet in fluid communication with the muffler chamber duct. A duct extends from the muffler chamber outlet into the aspirator chamber. | 06-02-2011 |
| 20110155504 | SILENCING EQUIPMENT FOR ELECTRIC DEVICES - Silencing equipment provided with one or more flow channels through which cooling air flows has a flow channel forming member that forms the flow channel, and an acoustic absorbent member that is fixed to the flow channel forming member. A resonance type silencer is formed on a wall surface of the flow channel by providing a cavity for the resonance type silencer in the acoustic absorbent member and an aperture for the resonance type silencer in a portion of the flow channel forming member. The resonance type silencer sets a frequency of noise necessary to be reduced based on a peak frequency of noise generated by a fan. The silencing equipment further has a slide member which slides by a slide mechanism to adjust the area of the top of the aperture. The silencing equipment for electronic devices capable of cooling heat generating sections thereof with air has a small and simple structure and can improve a silencing effect by blowing air. | 06-30-2011 |
| 20110214935 | METHODS AND SYSTEMS FOR INTEGRATING SOUND ATTENUATION INTO A FILTER BANK - A filter bank is provided. The filter bank includes a housing having a front face and a back face. Air flows along an air flow path from the front face to the back face. A filter layer is held in the housing. The filter layer is oriented between the front and back faces such that air flows through the filter layer before discharging from the back face. An attenuation layer is positioned within the housing to attenuate sound as the sound propagates between the front and back faces. The attenuation layer is oriented to extend along the air flow direction. | 09-08-2011 |
| 20110259666 | SOUND ATTENUATION CANOPY - A sound attenuation canopy for reducing levels of sound passing through an opening comprises a sound absorbing member. The sound absorbing member is comprised of a flexible sound absorbing material and has a first end, a second end and an intermediate portion extending between the first end and the second end. The first end is configured to attach to a periphery of the opening at a first location, the second end is configured to attach to a periphery of the opening at a second location and the intermediate portion is configured to be spaced apart from the opening. When the first end and the second end of the sound absorbing member are attached to the periphery of the opening, at least one side opening is at least partially defined by the intermediate portion and the perimeter of the opening, and a sound transmission flow path through open space between the opening and the side opening comprises at least one change of direction greater than 45 degrees. | 10-27-2011 |
| 20110308883 | ACOUSTIC NOISE CONTROL IN HEATING OR COOLING SYSTEMS - A heating or cooling system comprising a powered fan held in a duct assembly. The powered fan generates acoustic noise when blowing air. The system also comprises an acoustic wave modulator held in the duct assembly. The acoustic wave modulator has one or more fins and is configured to reduce turbulence of the air traveling through the duct assembly. | 12-22-2011 |
| 20120006615 | HIGH PRESSURE DROP MUFFLING SYSTEM - A system for venting a high-pressure flow stream is disclosed, the system comprising a device having a plurality of orifice plates, each orifice plate having a plurality of orifices, wherein the plurality of orifice plates are oriented relative to each other such that the pressure of the flow stream substantially drops. | 01-12-2012 |
| 20120018246 | Muffler Unit for Fume Extractor Hood - A muffler unit ( | 01-26-2012 |
| 20120024623 | NOISE ATTENUATOR AND VEHICLE AIR INTAKE DUCT PROVIDED THEREWITH - A noise attenuator which can reduce time and cost for installation thereof as compared with the conventional configuration and a vehicle air intake duct provided with the noise attenuator are provided. The noise attenuator includes a pair of circular through holes formed through a duct wall, a pair of wave transmitting/receiving membrane which are stretched so as to close the circular through holes, and a seesaw member which connects between central portions of the paired transmitting/receiving membranes. Accordingly, when one of the membranes receives a sound wave of noise thereby to be vibrated at a predetermined frequency, the other membrane follows it and is also vibrated while shifted by a half cycle. As a result, a cancellation wave with a phase opposite to the sound wave received by the one membrane is transmitted from the other membrane, whereupon the noise can be attenuated. | 02-02-2012 |
| 20120090915 | AIR DUCT ATTENUATOR - An attenuator for the air inlet tract of an internal combustion engine comprises an unobstructed tube ( | 04-19-2012 |
| 20120125709 | VANE TYPE SILENCERS IN ELBOW FOR GAS TURBINE - A silencer for a gas turbine includes a first duct portion; a second duct portion connected to the first duct portion, the first and second duct portions forming an elbow region at the connection; and a plurality of elbow shaped vanes provided in the elbow region. The plurality of elbow shaped vanes have equal lengths and are spaced equally apart. | 05-24-2012 |
| 20120211300 | SYSTEM METHOD AND DEVICES FOR WINDAGE NOISE DAMPING IN INDUCTION MOTOR - A rotor windage noise damping system for an induction motor cooling vent. A duct having a duct airflow path has a proximal end opening in communication with the cooling vent, and the distal end opening is for communication with ambient air. The duct includes a plurality of baffles. The baffles are oriented in a generally parallel mutually spaced symmetrical or asymmetrical array relative to each other and the duct airflow path. Dimensions for baffle array symmetry or asymmetry, parallel spacing, baffle thickness and baffle inset from one of the duct openings are chosen to restrict distance between adjacent baffles to less than a wavelength of windage noise at selected propagation frequencies, yet provide for sufficient cooling airflow through the duct. The duct may be tuned to dampen selected propagation frequencies by changing the baffle array. | 08-23-2012 |
| 20120217088 | SOUND ATTENUATING AIR VENT - A sound attenuating air vent comprises: an air path and a discontinuous sound absorbing lining around at least a part of the air path. A method of designing such a sound attenuating air vent comprises: determining a target attenuation performance based on the noise source and the receiver noise sensitivity and the separating construction, and determining a desired arrangement for the discontinuous lining and/or vent based on the target attenuation performance. | 08-30-2012 |
| 20120273298 | SILENCERS FOR AIR CONDITIONING SYSTEMS - Silencers for air conditioning systems are provided. In an exemplary embodiment, the silencer comprises a cylindrical silencer wall having a flow axis, a first channel disposed within the cylindrical silencer wall, and a second channel disposed within the cylindrical silencer wall. The second channel communicates with the first channel in a branch-off region and a connection region. A flow cross-section of the first channel and second channel changes in a complementary manner along the flow axis. | 11-01-2012 |
| 20120292127 | AIR INTAKE DUCT - To simplify the attachment of a cover member, an air intake duct | 11-22-2012 |
| 20130118830 | SOUND-ABSORPTIVE PANEL FOR AN AIR HANDLING SYSTEM - An assembly is configured to provide insulation and sound-dampening within an air-handling system. The assembly includes a single housing defining an internal chamber, at least one sound-absorption member within the internal chamber, wherein the at least one sound-absorption member is configured to dampen sounds generated by or within the air handling system, and an insulative material within the internal chamber, wherein the insulative material is configured to insulate the air handling system. | 05-16-2013 |
| 20130213733 | SILENCER AND ROTATING MACHINE EQUIPPED THEREWITH - In a silencer, holes are disposed in one row with intervals to each other along one direction, holes forming the one row are disposed in a plurality of rows in a direction perpendicular to the one direction, and positions of the holes in adjacent rows are shifted in the one direction and disposed in a zigzag pattern. A disposition interval of the holes of an outer edge hole row forming one row in at least two sides opposite to each other in the silencing porous plate is set to be larger than a disposition interval of the holes of a row inside the outer edge hole row. | 08-22-2013 |
| 20130248282 | SILENCER INCORPORATING ELONGATED MEMBERS - A matrix or array of elongated tubular members, each member being formed by spirally winding a piece or pieces of material into a generally cylindrical shape, wherein the matrix or array is mounted in an airflow to reduce the noise associated with and/or produced by the airflow. | 09-26-2013 |
| 20140209408 | EXHAUST CONE - A gas turbine engine exhaust cone ( | 07-31-2014 |
| 20140231169 | SOUND SUPPRESSOR DEVICE FOR AN AIR DRYING UNIT OF A COMPRESSED-AIR SUPPLY SYSTEM - 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. | 08-21-2014 |
| 20140299406 | SYSTEMS AND METHODS FOR PROVIDING LOW-NOISE POSITIVE AIRWAY PRESSURE - The systems and methods described herein include a low-noise apparatus for providing positive air pressure to a patient. The systems may include a housing with an inlet port, a vibrationally isolated blower unit positioned in an acoustic chamber, and an outlet port for delivery of the pressurized air from the blower unit. The acoustic chamber may include noise attenuators, such as walls, which adjust airflow so as to reduce the overall noise output of the system. | 10-09-2014 |
| 20140326533 | SUCTION CHAMBER - The present invention refers to a suction chamber having two volume parts which utilizes the principle of wave cancellation, by reversing the phase thereof, as a way of attenuating the noise, whose configuration presents a simple, effective, economical and affordable constructive process. It is composed by a body ( | 11-06-2014 |
| 20140339013 | DUCT - A duct of a foamed blow-molded article that is constituted of a polyolefin-based resin with a bending elastic modulus of 800-1,300 MPa, that has an average apparent density (D) of 0.1 to 0.4 g/cm | 11-20-2014 |
| 20150053498 | SILENCER FOR A VEHICLE AIR CONDITIONING SYSTEM - A silencer for a vehicle air conditioning system is designed to reduce a noise and a vibration of a compressor transmitted into a vehicle room along coolant pipes. The silencer includes a silencer body tube and an external resonance tube. The silencer body tube is installed between the coolant pipes wherein a coolant gas flowing along the coolant pipes passes through the silencer body tube, the silencer body tube including one or more resonance holes formed on an outer circumferential surface of the silencer body tube. The external resonance tube is installed on the outer circumferential surface of the silencer body tube wherein a resonance chamber for absorbing a vibration and a noise of a coolant gas flowing through the silencer body tube is defined between the outer circumferential surface of the silencer body tube and the external resonance tube. | 02-26-2015 |
| 20150101883 | SOUND ATTENUATION MODULE AND OVERSIZED GRILL - A Sound Attenuation Module and Oversized Grill is disclosed which prevents noise generated by an HVAC system from traveling through the duct system and into the room to which the air is directed. The goal is accomplished by use of oversized duct grills and an module placed between the wall and HVAC System, and uses an enclosure designed to expand the distance that the noise must travel. | 04-16-2015 |
| 20150300682 | METHODS AND APPARATUSES TO ATTENUATE ACOUSTIC WAVES - Apparatuses and methods to attenuate acoustic waves are provided. The method may include shifting the phases of a plurality of portions of the acoustic waves and merging the portions of the acoustic waves after phase shifting. Because, for example, the phases of the acoustic waves may be out-of-sync when being merged, the acoustic waves may be attenuated. A muffler incorporating the method of attenuating acoustic waves can include a plurality of acoustic paths, each of which may have different acoustic impedance and/or length. The acoustic paths may help the acoustic waves have out-of-sync phases after the acoustic waves passing through the acoustic paths, resulting in acoustic wave attenuation. | 10-22-2015 |
| 20150315780 | LOW-WIND-RESISTANCE RAINPROOF SILENCER FOR CHIMNEY - The present invention relates to a low-wind-resistance rainproof silencer for chimney, which includes: a main body, formed with a hollow chamber, two lateral walls of the main body are respectively filled with a sound absorbing material, and inner sides of the two lateral walls are respectively formed with a first sound absorbing surface; a water collecting disc, formed in a conical status and disposed in the hollow chamber, formed with a rain blocking plate having a third opening with the bottom being connected to a water discharging pipe; and a base tube; accordingly, rainwater is able to be collected by the rain blocking plate and discharged out of the main body through the water discharging pipe; airflow discharged by the chimney is able to be silenced by the first sound absorbing surfaces thereby achieving a sound silencing effect. | 11-05-2015 |
| 20160102786 | DUCT AND METHOD FOR MANUFACTURING SAME - Provided is a duct that does not cause defective molding and has a highly sound absorption inner surface which can effectively suppress noise. A duct includes a tubular duct main body and a sound absorption member disposed on the inner surface of the duct main body. The duct has at least one of configurations (1) to (3): (1) the duct main body has a sandwiching part having a pair of opposite wall surfaces, and a side edge of the sound absorption member is sandwiched between the wall surfaces of the sandwiching part; (2) the sound absorption member is pasted to the inner surface of the duct main body with a resin film therebetween; and (3) the sound absorption member and duct main body have parts which are not fused to each other. | 04-14-2016 |
| 20160195299 | ACOUSTIC DISPERSING AIRFLOW PASSAGE | 07-07-2016 |
