Abstract: The present invention regards to a silencer for automobiles, architectural and other mechanical facilities, which is composed of following components? the pipe-type body that is installed on the exhaust system of mechanical structure where its one end forms the inlet of exhaust gas and the other end of it forms the outlet for discharge of exhaust gas; the multiple noise absorption guides that are installed inside the body of the silencer consecutively at regular intervals in the direction from the inlet to outlet of the above body. The noise absorption guide has a hollow form, of which the inlet is situated to the inlet of the body and the outlet is to the outlet of the body. The circumference of the above outlet is combined with the inside surface of the body.

Abstract: An exhaust gas exhausted from a fuel cell is sent to a silencer through an exhaust pipe. The silencer is provided with a conductive noise absorbing material, and is fixed to a vehicle body through a metallic fixing jig. Thus, the noise absorbing material is earthed to the vehicle body so that it is possible to prevent static electricity from being generated in the use of the fuel cell vehicle such as in a low humidity environment.

Abstract: An air induction silencer assembly includes an acoustic interference member disposed within a conduit. The acoustic interference member is tuned to acoustically cancel a selected noise energy frequency. An acoustic absorbing member is also disposed within the conduit. The acoustic absorbing member converts noise energy within the conduit into heat energy to attenuate noise energy within the air induction silencer assembly. The air induction silencer assembly connects to a flexible conduit that includes an inlet portion, an outlet portion, and a flexible joint that connects the inlet portion and the outlet portion together. The flexible joint includes a rolling lobe and a rolling surface. The rolling lobe moves along the rolling surface when the inlet portion moves relative to the outlet portion.

Abstract: An object of the present invention is to provide a duct having a simple structure and capable of suppressing occurrences of an intake noise and a dropping-out of an adsorbent, and to a process for producing the same capable of producing easily. The present duct (1) is one comprising a duct body (2) in tubular, and the duct body (2) is comprised of a nonwoven fabric in which an adsorbent (3) in at least one type among granular, powdery and fibrous is disposed as an intermediate layer. The duct body (2) is preferably composed of a first fiber layer (7) located on an inner circumferential side, a second fiber layer (8) located on an outer circumferential side, and the adsorbent (10) is disposed between the first fiber layer (7) and the second fiber layer (8).

Abstract: A system for separating contaminants from an air stream entering a sealed case through a vent fitting communicating to the interior cavity of the case includes a contaminant separator having a housing enclosing a chamber, an inlet and outlet communicating with the chamber, a baffle located in the chamber and producing a constricted fluid flow passageway between the inlet and the outlet.

Abstract: Provided is a sub-muffler which needs no heat resistant material such as SUS, and which can keep its durability and sound absorbing performance even when the sub-muffler is exposed to various corrosive components in the exhaust gas. At the same time, accomplished is a low-cost manufacture, which is a challenge that sub-mufflers and sound absorbing materials commonly face. Disclosed is a sub-muffler in which a perforated exhaust pipe is arranged, and caps and an out pipe are arranged outside the perforated pipe. Sound absorbing materials are filled in the space between the perforated exhaust pipe, and the caps and the out pipe. The sub-muffler is characterized in that, among the sound absorbing materials, at least part of the sound absorbing material of the perforated pipe side is a basalt fiber for high temperature.

Abstract: 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.

Abstract: A system and method for dissipating at least one pressure wave in an exhaust gas flow is disclosed. A vehicular exhaust system directs the exhaust gas flow through a plurality of coaxial and perforated generally cylindrical tubes contained within an insulated canister towards a perforated partition plate. Through a series of apertures in the tubes and plate, the at least one pressure wave is dissipated such that sound attenuation is achieved without output loss from the engine.

Abstract: An exhaust system for a straddle-type vehicle that achieves miniaturization while meeting a demand for noise reducing characteristics. The exhaust system is connectable to an engine, and includes an exhaust pipe connectable to the engine and a silencer. The exhaust system further comprises a tail pipe inserted into the silencer 10. The silencer comprises an outer housing and an inner core accommodated in the outer housing. An air space is provided between the tail pipe and the inner core.

Abstract: An environmental control system muffler including a thin wall polyetherether ketone (PEEK) cover tube, an open cell polymer attenuator tube slip fit there into and polymer end fitting securing the two tubes together and cooperating to form a pneumatic seal with the cover tube. The method of making the muffler apparatus includes the selection of tubing constructed of such PEEK corrugated construction and the open cell polymer noise attenuation construction, telescoping the tubes together and securing the end fittings thereto.

Abstract: An acoustic attenuation device including an elongated hollow body having an open upstream end taking the form of a head for coupling to a compressed air outlet, and a closed downstream end, the hollow body having a sidewall with a plurality of air exhaust openings arranged in the downstream part, where the hollow body contains at least one upstream buffer lining forming a longitudinal filter and at least one downstream filtering lining forming a sheath.

Abstract: An exhaust device for a straddle-type vehicle that satisfies the requirements of sound deadening characteristics and which has a reduced size is provided. The exhaust device for a straddle-type vehicle that includes an exhaust pipe connected to an engine and a silencer connected to the exhaust pipe. The silencer includes at least one resonator selected from a group consisting of a Helmholtz resonator and a side branch resonator. The resonator is packed with a sound absorbing material.

Abstract: A catcher, in combination with a firearm having an ejection port, for receiving and retaining expended magnetically attracted shell casings through the ejection port as the firearm is discharged. The catcher includes a hollow housing having a plurality of rigid walls, and retainers. One of the walls has an opening in communication with the ejection port when the catcher is mounted to the firearm for receiving the shell casings. A seal is attached to the housing at the opening and surrounding the opening and provides controlled release of pressurized ejection port gas from inside the housing as the firearm is discharged such that noise and flash as a result of escape of the pressurized ejection port gas is reduced or eliminated.

Abstract: The invention concerns an external gear hydraulic pump including a pump body housing rotating pinions that mutually engage. Located on opposite sides of the body are a cover and a support, forming an outlet manifold for high pressure fluid. Acoustic insulation elements damp the vibrations produced by the pinions. The acoustic insulation elements acoustically decouple the pump body from the support.

Abstract: A muffler comprising a generally cylindrical in-line muffler having a seamless outer body for use in silencing airboat engines is disclosed. An inner perforated stainless steel inner tube is surrounded by a stainless steel mesh liner and a stainless steel outer body having opposing ends swaged to a reduced diameter. The use of all stainless steel components provides a muffler that is highly resistant to corrosion. In addition, the muffler is ideally suited for use in marine environments since it is capable of discharging ingested water as the stainless steel perforated inner tube and mesh liner will not become water logged. A method for fabricating mufflers in accordance with the present invention if further disclosed.

Abstract: A sealing system for sealing a component (102) within an electronic device (100) is provided. The system includes one or more apertures (206) within an internal housing (202). Further the system includes an adhesive (602), adhered on a first surface to a ledge (502) and bottom perimeter surface 402 of the component. Furthermore, the system includes an external housing (204). The external housing presses the perimeter of the component onto the ledge.

Abstract: A noise eliminator for a fuel cell installed in an exhaust system discharging exhaust gas from the fuel cell, comprising an inner pipe having a plurality of sound transmission holes formed in its peripheral wall and allowing the exhaust gases to flow therethrough and an outer shell disposed to surround the inner pipe through a prescribed distance from the peripheral wall and constituting a sound absorbing chamber with a sound absorbing material filled in the clearance thereof from the inner pipe. The sound transmission hole has an inner diameter of 3 mm or greater, and a depth of 1.2 mm or less.

Abstract: A muffler system includes a housing having two pipes perforated with holes or other shapes that slide or rotate on top of each other. The sliding or rotating pipes allow for varying degrees of alignment of the holes and thereby allow more or less sound dampening. The control of the sound dampening is actuated by an operator via an electric switch that activates at least one of the pipes inside the muffler system to rotate or slide on each other thereby aligning the holes.

Abstract: A high-performance exhaust silencer in which a shell wall includes a shell outer plate, a shell inner plate, and a damping material to be inserted therebetween. A space between the shell outer plate and shell inner plate of the exhaust silencer is narrowed and the shell outer plate and the shell inner plate will not interfere with each other. An outer shape of the exhaust silencer is small but the expansion chambers are large by providing an air space between the shell outer plate and the shell inner plate. For the above-mentioned damping material, a material obtained by stretchably weaving metal wire into mesh is used.

Abstract: The invention relates to a silencer comprising an inner component and an outer component surrounding said inner component, said inner component defining an inner wall provided with openings and said outer component defining an outer wall extending along said inner wall. For improving the silencing characteristics as well as the flexibility of the silencer, the outer wall is implemented as a bellows which defines together with the inner wall individual cavities, the openings of the inner wall opening into said cavities. Furthermore, the outer wall is produced from a material having a density of at least 1.5 g/cm3.

Abstract: A compressor has first (26) and second (28; 30) enmeshed rotors rotating about first (500) and second (502; 504) axes to pump refrigerant to a discharge plenum (42). The compressor includes a muffler system (200) comprising a sound absorbing first element (232) and a sound absorbing second element (236). The second element at least partially surrounds the first element and defines a generally annular flow path portion (230) between the first element and the second element. A wall (250) at least partially surrounds the second element. A space (259) optionally containing a sound absorbing third element (261) surrounds the wall.

Abstract: A muffler for a motorcycle, the muffler including an outer tube and an inner tube disposed substantially within the outer tube. The inner tube includes a first end adapted to receive the exhaust gases from the engine, a second end opposite the first end adapted to release the exhaust gases to the environment, and first and second apertures positioned between the ends. The muffler also includes a mesh tube disposed between the outer tube and the inner tube. The mesh tube defines a chamber between the inner tube and the mesh tube such that the exhaust gases exit the inner tube through the first aperture into the chamber, and exit the chamber into the inner tube through the second aperture. The muffler also includes a noise attenuating material disposed between the mesh tube and the outer tube.

Abstract: A gas expansion silencer comprising an endpiece for being connected to a source of gas under pressure, and a low-pressure stage comprising two cylindrical portions respectively of smaller diameter and of larger diameter, the smaller-diameter portion being connected to the endpiece and the larger-diameter portion having gas outlet orifices, the low-pressure stage being entirely filled with a porous metal packing.

Abstract: A noise eliminator for a fuel cell, where an outer shell has a reception section in which a sound absorption material is placed between the outer shell and an inner pipe and has a water discharge section that is positioned so as to face a lower portion in the vertical direction of the inner pipe and in which the sound absorption material is not placed between the outer shell and the inner pipe. The water discharge section receives water flowing into the outer shell and allows the water to flow to the outside of the outer shell. Although the water discharge section receives water flowing into the outer shell, the sound absorption material inside the noise eliminator does not absorb the water from the water discharge section and does not-contain it because there is no sound absorption material in the water discharge section.

Abstract: A muffling apparatus (100) having a first, muffling segment (1010) and a second (1020), non-muffling segment is provided for placement within an oil separator of refrigeration or cooling system, wherein the apparatus has a non-straight shape and a lumen defined therein to allow for noise-creating pressure pulsations/waves to come into contact with absorbing material (120) of the muffling segment (1010) in order to attenuate the energy of the pressure waves/pulsations into heat and thus reduce oil separator vibrations caused thereby.

Abstract: A sheet member including inorganic fibers includes a first outer layer; a center layer; and a second outer layer. The first outer layer, the center layer, and the second outer layer are laminated with each other such that both the first and the second outer layers are outermost layers; the center layer includes inorganic fibers having diameters equal to or less than approximately 3 micrometers; and the first and the second outer layers include inorganic fibers having diameters greater than approximately 3 micrometers.

Abstract: A conventional machine package faces problems concerned with costs, weight, etc. and also a problem of antinomy that an attempt to enhance the noise reducing performance increases the airflow resistance and then deteriorates the cooling performance. Providing a sound absorbing structure with the heat radiation performance ensured within a practical range and then with considerably improved noise reducing effect achieves a low-noise machine package with a downsized casing and a reduced cooling fan power.

Abstract: An exhaust chamber system having a rotatable propeller type blade assembly at the entry to an expansion chamber which creates a vortex that swirls exhaust gas towards the outlet. The resultant action within the exhaust chamber aids in scavenging internal combustion engine exhaust gases, and in reducing system back pressure. The exhaust chamber maintains the sound level of the exhaust within acceptable limits while delivering improved horsepower, torque, and/or fuel efficiency over other known conventional mufflers.

Abstract: The present invention provides an exhaust chamber system, comprising a stationary propeller type blade assembly with a nose cone within or adjacent to an expansion chamber, to create a vortex that swirls exhaust gas towards the outlet. The resultant vacuum within the exhaust chamber aids in scavenging an internal combustion engines exhaust gases, and in reducing system back pressure The exhaust chamber maintains the sound level of the exhaust within acceptable limits, while delivering improved horsepower, torque, and/or fuel efficiency over standard and other performance mufflers.

Abstract: The present invention describes an automobile exhaust pipes, and more particularly to an exhaust pipe capable of producing appropriate pressure to assist engine torque output when the engine is running at a low speed and expediting the waste gas to be discharged from an automobile when the engine is running at a high speed, so as to enhance the operating performance of automobile engines.

Abstract: A noise control apparatus for a motorcycle exhaust system. The apparatus includes at least one exhaust pipe assembly having a direct pass-through mode and an indirect mode wherein exhaust gases are optionally directed through noise attenuating means. The apparatus includes at least one valve for controlling exhaust gas flow, a motor, a switch controlling said motor, a wire carrier, a wire connected between the carrier and the valve(s), and a rotary threaded drive shaft driven by the motor for moving the positioner. The threaded drive shaft includes radially extending and circumferentially facing stop means on both sides of said wire carrier. The valve is positioned under the control of the switch.

Abstract: The present invention includes a power booster pipe suitable for attenuating sound associated with the intake or exhaust of an internal combustion engine and reducing pressure drop associated with movement of gases during operation of the engine. Generally, a diffuser portion is combined with an attenuation portion. One or more tubes of perforated material, such as steel and perforated flutes running the length of the tube increases the surface area of sound attenuating material exposed to combustion gases and the accompanying noise. The perforated flutes and tube can be encircled with sound reducing infill material. A low pressure drop design can be incorporated which includes a gradually increasing diameter tube utilized to route the combustion gases.

Abstract: In the silencer of the present invention, a cylindrical porous plate is provided on the outer circumferential side of a path forming component that forms a sound absorption path. The porous plate has a plurality of micro holes penetrating it in the thickness direction. By forming the plurality of micro holes on the outer circumferential side of the porous plate, sound generated by the air flowing along the sound absorption path is attenuated without any sound absorption material being used. The porous plate is formed from metal. As a result, there is no source for generating for dust and dirt such as sound absorption materials formed, for example, from connected foam resin and fiber. Accordingly, it is possible to reduce sound that is generated by the flow of air while also reducing the creation of dust and dirt.

Abstract: A bumper/muffler assembly is provided comprising a bumper; and a muffler having an outer shell. The outer shell may be formed from a non-high impact resistant material, such as a thin metal or a composite material. The muffler may comprise a separate element from the bumper, which is coupled thereto, or is formed as an integral part of the bumper.

Abstract: The present invention relates to a silencer easily cleanable inside. This silencer comprises a casing cylinder and a segment member housed in the casing cylinder to constitute a sound reducing means. The silencer further comprises a segment member fastening means for fastening the segment member to the casing cylinder, a gas inlet-side lid plate with a punched hole, which closes an opening at one end of the casing cylinder, and a gas outlet-side lid plate with a punched hole, which closes an opening at the other end of the casing cylinder. At least either one of the gas inlet-side lid plate or the gas outlet-side lid plate is adapted to be detachable from the casing cylinder.

Abstract: A muffler includes three or more concentric pipes which convey exhaust gases from an input end of the muffler to an output end of the muffler. The exhaust gases reverse direction as they pass from a first pipe into a second pipe, and again as they pass from the second pipe into the third pipe. After the exhaust gases have reversed direction twice, they exit the muffler. Perforated portions of the three concentric pipes can be used to allow exhaust gases to pass from one pipe into another.

Abstract: A method is employed to attenuate ultrasonic noise propagating in a flow stream of a fluid flow system. In particular, the method attenuates the noise propagating between a noise source and a reference point in the flow stream (wherein the reference point and the noise source are positioned in the flow stream in direct acoustic line of sight relation). The method includes positioning an absorbent element in the flow stream between the noise source and the reference point. Then, the ultrasonic noise is directed past vicinity of the absorbent element such that indirect ultrasonic noise is absorbed by the absorbent element. Preferably, the method also includes deflecting the ultrasonic noise to convert direct noise to indirect noise prior to directing the ultrasonic noise past the vicinity of the absorbent material in the flow stream. Such a method may be employed to attenuate ultrasonic noise by up to about 20 dB to 45 dB.

Abstract: A tubular sound/heat insulating tubular structure which may serve as a muffler packing for internal combustion engine exhaust mufflers comprises in one embodiment an inner layer of solely stainless steel wire mesh formed into a continuous length tube. An intermediate structure in that embodiment comprises a flattened tubular structure which is wrapped into two overlying layers of coknitted basalt or other continuous length non-metallic fibers and preferably stainless steel wire. The flattened juxtaposed layers are wrapped about the inner layer at least once by feeding both structures through a cone and forming at least two or more layers of coknitted wire mesh and basalt fibers. In this embodiment, an outer layer of solely stainless steel wire mesh is then knitted about the overlying concentric tubular structures fed from the cone into and through a knitting machine.

Abstract: The invention relates to an exhaust silencer or muffler for an internal combustion engine, in particular a silencer with the damping characteristics of a resonator with the absorptive characteristics of a dissipative silencer. The silencer of the present invention provides an improved silencer or muffler for use with an internal combustion engine that incorporates both a dissipative silencer and a resonator in a single muffler assembly suitable for use with standard automotive construction techniques.

Abstract: An acoustic filter is provided with a single flow chamber for exposure of a flexible rubber layer to liquid undergoing flow through the flow chamber with noise producing acoustic energy therein. The flexible rubber layer is supported on a cylindrical drum with slanted holes therein through which the exposure to the liquid in the flow chamber is effected. An axially sectioned drum with dimensionally different diameters, radial thicknesses and slanted holes therein is positioned over the rubber layer within an outer casing to establish a plurality of gas-filled cavities of different axial lengths and separated from each other along the axial length of the liquid flow chamber which is connected at its opposite axial ends by pipe sections to a piping system from which the liquid within the flow chamber is derived.

Abstract: An exhaust muffler includes upper and lower external shells that are formed from metal material. A heat shield is disposed in the muffler adjacent the upper external shell. The heat shield is formed from a high-density fiber insulation pad configured to nest with the concave inner surface of the upper external shell.

Abstract: The exhaust created from the operation of pneumatic tools can create a considerable amount of noise. The present disclosure includes a detachable muffler apparatus used to reduce the sound during the operation of a pneumatic tool. The muffler apparatus includes a flexible outer housing that defines a muffler passage extending between a muffler inlet and a muffler outlet. The flexible outer housing includes an attachment end that defines the muffler inlet and a distal end that defines the muffler outlet. The attachment end can be removably attached to a pneumatic tool body by a fastener. Tool exhaust is forced through and around folds within at least one sheet of permeable material positioned within the muffler passage.

Abstract: A pneumatic tool (610) and a muffler assembly (600) therefor, for quieting the operation of the pneumatic tool, are disclosed. In one embodiment, the muffler assembly (600) is slidably disposed within the exhaust passage (616) and includes a tube member (602) having a proximal flange (604), an intermediate tubular portion (606) with apertures (608), and a distal receptacle (620). The tubular portion may include a blocking plate (618) therein. A porous, sound-deadening panel (622) is disposed about the tubular portion, and a diffuser panel (630) is disposed in the distal receptacle. A perforated end cap (624) holds the muffler assembly in place. In operation, the exhaust enters the tube member, is directed transversely through apertures in the tubular portion and through the porous panel, then back into the distal portion of the tube member, through the diffuser panel, and exits through the end cap.

Abstract: A noise reducing device for a pressurized fluid stream, i.e., a gas, includes a housing. An inlet end and an outlet end of the housing each have at least one orifice for passing a fluid therethrough. The inlet end orifice includes an inlet face and an outlet face and the inlet end orifice is configured for maintaining a backpressure upstream of the inlet end orifice. A diffusing pack material is disposed within the housing. One or more stiffeners may be disposed within the diffusing pack material to ensure that the diffusing pack material maintains contact with the outlet face of the inlet end orifice and/or to prevent the migration of the diffusing pack material within the housing, thereby maintaining a homogeneous distribution of the pack material.

Abstract: A method for containing fibrous material within muffler comprises the initial step of providing an internal assembly of a muffler. In the next method step, a sheet is placed about the internal assembly to form an enclosure about a compartment. In the next method step, the compartment is filled with a fibrous material. A muffler according to the invention comprises a muffler having an outer shell having an internal cavity and outer edges. An internal assembly is inserted within the internal cavity. The internal assembly comprises partitions and a sheet about the internal assembly and extending between the partitions from an enclosure between the partitions. The enclosure is filled with fibrous material. End plates are joined to the outer edges of the outer shell.

Abstract: A filter assembly configured for acoustic dampening for use with compressor assemblies such as oxygen concentrators including a compartmented housing member having an inlet opening, an outlet opening, a filter member, and a plurality of noise attenuating members positioned and located therewithin. The configuration of the compartmented housing member in conjunction with the positioning and location of the filter member and the noise attenuating members therewithin all contribute to absorb and dissipate any sound waves generated within the housing member due to air flow movement therethrough. This substantially reduces and minimizes noise associated with the present filter assembly.

Abstract: A muffler has an integrated SCR catalytic converter for an exhaust line of an internal combustion engine, in particular in a motor vehicle The muffler includes a housing which has an intake trumpet on the intake end and an exhaust pipe on the output end. Catalytic converter elements are arranged in the housing with one inlet end in an inlet chamber and with an outlet end in an outlet chamber. An outlet end of the intake trumpet communicates with the inlet chamber. To improve the efficiency of the SCR catalytic converter the inlet chamber is sealed off from the outside and with respect to the intake trumpet and the catalytic converter elements to the extent that in operation of the internal combustion engine with exhaust gas loaded with urea, passing through the intake trumpet into the inlet chamber, the exhaust gas leaves the inlet chamber only through the catalytic converter elements.

Abstract: A muffler assembly, comprising an outer muffler assembly comprising a plurality of fiberglass discs and a plurality of reactive plates, and an inner muffler assembly comprising a plurality of fiberglass discs and a plurality of reactive plates the inner muffler assembly generally surrounded by the outer muffler assembly and defining therebetween a gas flow gap.

Abstract: A method for forming odd-shaped mufflers is achieved by first introducing an unfilled muffler insert having a desired number of pipes and partitions within a two-piece shaped tool. Fibrous material is introduced within desired compartments formed between the shaped tool and unfilled insert to form a filled insert. The shaped tool and filled insert are then placed on a winding device. A yarn thread is then wound and secured around the fibrous material within a gap created between the two pieces of the shaped tool. The winding device and shaped tool are then removed from the filled and wound muffler insert. The wound and filled muffler insert may then either be pressed into a previously formed muffler shell, or alternatively, the muffler shell may be formed around the wound and filled muffler insert to form the muffler.

Abstract: Exemplary methods, devices and/or system for reducing noise produced by a turbine, such as, a turbocharger turbine. An exemplary exhaust conduit employs material to absorb exhaust-borne noise and/or structure-borne noise. Another exemplary exhaust conduit employs features that dampen wall vibration.