Abstract: A marine engine muffler is provided having a silencing element with an inclined surface defining an array of elongate slotted apertures generally disposed in circumferential alignment. The slotted apertures are preferably defined by angled sidewalls such that exhaust gas flowing therethrough is forced to travel in a path that forms a reverse angle relative to the overall exhaust flow path thus conducting exhaust gases and entrained water to reverse direction while flowing through the silencing element. The conical silencing element is specifically sized to avoid resonant vibration within the operational RPM range of the engine and is further sized relative to the combined displacement of the engine and/or cylinder bank in fluid communication therewith to avoid resonant vibrations caused by reflected exhaust gas pressure waves generated by the internal combustion engine.

Abstract: A flow tube for an induction system with a turbo charger defines a longitudinal flow path and includes a noise attenuation plate positioned within the flow tube. A plurality of ribs formed on an internal surface of the tube. The ribs are spaced apart from one another and are tuned to a desired frequency. The noise attenuation plate includes a plurality of holes having varying diameter and depths. When acoustic energy created by the turbo charger encounters the noise attenuation plate and the ribs, the change in impedance results in acoustic reflections back toward the turbo charger. Thus the noise attenuation plate cooperates with the ribs to serve as a low pass filter that attenuates high frequencies while allowing lower frequencies through.

Abstract: An engine noise reduction device to reduce sound output from an engine compartment and supply cooling air to the engine compartment to increase cooling efficiency and prevent engine and component overheating. The device opposes a plurality of air inlets, to receive an air flow therefrom, and includes a split-type noise absorbing portion and a cell-type noise absorbing portion.

Abstract: To provide an exhaust structure for a jet propulsion watercraft which can simply achieve a reduction of the exhaust noise. In the exhaust structure for a jet propulsion watercraft, a water jet propeller is provided in a pump room of a watercraft body. An engine for driving the watercraft is connected to the water jet propeller. An exhaust opening of an exhaust pipe is attached to the engine and is exposed to a pump room. A resonator for sound deadening is provided for the exhaust pipe. Further, in the exhaust structure for a jet propulsion watercraft, the resonator is bent in a meandering state such that bent portions thereof are positioned adjacent to each other so that the entire resonator has a substantially flat plate-like configuration. The resonator having a plate-like configuration is laid along a ceiling wall of the pump room.

Abstract: The current invention is device for lowering the air velocity and inherent noise of high-speed air released from a closed system, comprising a straight pipe module with an outer tube and a concentric inner tube creating an annular space therebetween. The inner tube has interior fins at the inlet, which initiate rotation in an airflow directed therethrough, and interior fins at the outlet, which arrest the airflow rotation. Perforations along the length of the inner tube, from inlet fins to outlet fins, permit the release of a turbulent outer zone of the airflow, permitting the high velocity core of the airflow to expand and slow, reducing the noise of the airflow.

Abstract: The transverse partition for separating an exhaust volume into two adjacent chambers includes at least one gas flow passage between the two chambers, the gas flow section through the passage being modifiable under drive from the difference between the pressures on the two sides of the partition. The partition comprises a wall pierced by at least one slit defined between two adjacent edges of the wall, which wall is elastically deformable under drive from the difference between the pressures on the two sides of the partition, between a rest position in which wall continuity is ensured, the two edges of the slit being substantially touching, and a deformed position in which the two edges of the slit are spaced apart so as to define said gas-flow passage between them.

Abstract: A device for noise configuration in a motor vehicle has a hollow body which is divided into at least two spaces. One space is connected to a gas-carrying part of an internal combustion engine arranged in the motor vehicle, and the other space is coupled acoustically to an interior and/or to an engine space of the motor vehicle and/or to the space surrounding the motor vehicle. The hollow body is divided into the two spaces by an essentially acoustically inactive wall. A vibrational element, which extends into both spaces, is arranged within the hollow body.

Abstract: A muffler for a steam cleaning apparatus comprising a housing having a first and a second inlet, and an outlet, a plurality of baffles disposed within, and coupled to the housing, wherein the plurality of baffles are covered with a foam; wherein the first inlet is pneumatically coupled to an air pump of the steam cleaning apparatus, and wherein the first inlet provides to the housing a stream of humid air from an application subsystem of the steam cleaning apparatus; and wherein the second inlet receives combustion exhaust from a combustion motor that drives an air pump that is operationally coupled to the application subsystem, and wherein the outlet releases air comprising combustion exhaust of the motor.

Abstract: The present invention provides a sound attenuator for pneumatic exhaust that includes a body having an open end and an inner cavity defined by an inner wall, an inlet port provided in the body adapted to establish fluid communication between a source of pneumatic exhaust and the inner cavity, a cap releasably connected to the body to cover the open end, at least one exit port in fluid communication with the inner cavity, a plurality of baffles arranged within the inner cavity so as to define a series of sequential closed chambers between the inlet port and the exit port, and a deflector proximal to the exit port, the deflector redirecting the flow of pneumatic exhaust at least 90° and cooperating with an exterior surface of the body to define an expansion zone. Each of the baffles has a periphery in contact with the inner wall and is adapted to flex under a predetermined pneumatic pressure load to permit the pneumatic exhaust to flow between the periphery and the inner wall of the body.

Abstract: A catalytic muffler has at least one reactor bed, each bed having an array of discreet adjacent flow zones. The flow zones are interconnected by a series of passages for unidirection flow of a gaseous fluid sequentially through each adjacent zone in turn from an inlet side of each reactor bed to an outlet side of the reactor bed. An inlet fluidly communicates with a first of the flow zones. An outlet fluidly communicates with the last of the flow zones.

Abstract: A muffler assembly, for use in the exhaust systems of vehicles or machinery using internal combustion engines, particularly piston or Wankel rotary types, consisting of either a square or round(ed) tube, with perforated baffles folded at angles, affixed within it.

Abstract: In-line exhaust systems comprise an exhaust pipe, and a sound-attenuating baffle in the exhaust pipe. The baffle has one or more baffle plates extending across the gas flow channel, at least one at an oblique angle. Each plate has an array of apertures therethrough. The plates are joined to each other, preferably in edge-to-edge relationship, preferably forming included angles with each other and forming preferably different, oblique angles to the longitudinal axis. In preferred embodiments, plate aperture area increases, plate-to-plate, along the direction of advance of gases in the exhaust system. A backwash valve can lie over one of the baffle plates. The exhaust system can include a water jacket, and optionally an outer sound attenuation chamber. The baffle is preferably 36 or less inches long, the exhaust system reducing noise by at least 3 decibels.

Abstract: A silencer for connection to the air intake of a machine such as a turbocharger compressor. The silencer comprises a housing containing a plurality of axially spaced annular noise attenuating baffles. Each baffle has an outer circumference and an inner circumference defining a central aperture, the central apertures of each baffle collectively defining an axial outlet flow passage to an outlet aperture.

Abstract: A muffler for an internal combustion engine, capable of sufficiently attenuating exhaust sound and preventing power output from being reduced by allowing exhaust gas to flow without a hitch and generating vortices. The muffler comprises a casing, a vortex diffusing member, a vortex generating cylinder, and a vortex generating member. The vortex diffusing member is mounted in the casing and is connected to an exhaust inlet pipe. The vortex generating cylinder is positioned in the casing at its first side and is protruded into the exterior at its second side, and is provided with a tail pipe at its exterior end. The vortex generating member is axially mounted in the vortex generating cylinder.

Abstract: The use of fiber metal or similarly high flow resistance and high acoustic transparency material as a liner for traditional acoustically absorptive media in a dissipative muffler exhibits improved low frequency sound attenuation, reduces backpressure, and eliminates media entrainment or “blow-out” phenomenon which results in longer muffler life. The same class of materials may also be used to fashion an element that provides linear occlusion inside an otherwise line-of-sight type of muffler, where the occluding element provides improved impedance-matching acoustic absorption. Disclosed embodiments providing linear occlusion minimize traditional increases in muffler backpressure by incorporating helical, conical, and annular members in mufflers with round ducts. To maximize attenuation, a muffler according to the invention may feature both a fiber metal fill liner and a fiber metal linear occlusion element.

Abstract: A personal watercraft with an exhaust system including a first and second mufflers each disposed in opposite sides of the hull. A manifold pipe communicates the engine with the first muffler. A transfer pipe communicates the first muffler with the second muffler. An outlet pipe communicates the second muffler to the atmosphere at an exhaust point located at an opposite side of the hull. The outlet pipe has a raised portion between the second muffler and the exhaust point so that only rotation of the watercraft in a first rotational direction will cause entrant water in the outlet pipe to flow into the second muffler. The transfer pipe has a raised portion between the first and second mufflers so that only rotation of the watercraft in second rotational direction about the longitudinal axis opposite the first rotational direction will cause water that has flowed into the second muffler to flow into the first muffler.

Abstract: A flow tube for an induction system with a turbo charger defines a longitudinal flow path and includes a noise attenuation plate positioned within the flow tube. A plurality of ribs formed on an internal surface of the tube. The ribs are spaced apart from one another and are tuned to a desired frequency. The noise attenuation plate includes a plurality of holes having varying diameter and depths. When acoustic energy created by the turbo charger encounters the noise attenuation plate and the ribs, the change in impedance results in acoustic reflections back toward the turbo charger. Thus the noise attenuation plate cooperates with the ribs to serve as a low pass filter that attenuates high frequencies while allowing lower frequencies through.

Abstract: A silencer for use with ultrasonic meters to reduce stray ultrasonic noise that could cause measurement inaccuracies. The silencer comprises a tubular body having at least two baffles spaced apart from one another. The baffles are preferably formed of an open-cell, reticulated metal foam material that absorbs noise in the ultrasonic range of frequencies under high-pressure operating conditions. The silencer is a reasonable flow conditioner and can be mounted directly to the meter without disturbing the flow. The silencer reduces the level of ultrasonic stray noise by absorption. Ultrasonic noise waves are partially reflected between the baffles and along their length as the waves move between baffles. With each reflection, the baffle material absorbs energy that is lost by friction in the pores of the foam material. Through this process of the ultrasonic waves being reflected and the noise being incrementally absorbed, the energy of the ultrasonic wave is attenuated.

Abstract: A flattened [single or dual inlet] acoustic muffler [boom tube exhaust pipe for reducing acoustic noise contained in the exhaust gas flow,] for use on [race cars, such as] stock cars. The muffler [which race on oval tracks, which] mounts to the standard exhaust system pipes and to the lower [frame or] chassis of the car, [and which routes] routing exhaust gasses to one or both sides of the car while providing improved ground clearance between the exhaust pipe and the surface of the race track. [The construction of the boom tube exhaust pipes comprise single or dual slightly flattened circular inlets which lead exhaust gasses into a flattened profile body constructed of formed sheet metal half shells, with the inlets at or above the lower plane of the body. One or more formed sheet metal structural ribs extend through the body and into the inlets and one or more spacer ribs support the half shells within the body.

Abstract: A muffler has an elongated generally cylindrical casing having inlet and outlet ends, an elongated generally frustroconical baffle in the casing adjacent the inlet end with the smaller diameter portion being spaced from the inlet end. The peripheral wall of the baffle has closely spaced perforations over the major portion of its axial length and is spaced from the shell to provide a chamber thereabout. A generally cylindrical baffle has one end extending over the smaller diameter portion of the frustroconical baffle and has its peripheral wall spaced from the casing to provide a chamber thereabout. The peripheral wall of the cylindrical baffle has closely spaced perforations over most of its length. Exhaust gases enter the frustroconical baffle and exit through the perforations therein, move axially in the casing thereabout, and then pass through the apertures into the cylindrical baffle.

Abstract: A gear pump for the power steering of a motor vehicle is integrated into the housing of the drive unit and is surrounded by both the discharge space and the intake space, which extend over the entire length of the housing Ribs are provided in the discharge space for pulsation damping and for stabilization of the pressure field. A filter space is provided between the cover and a filter cap.

Abstract: A fluid compressor includes a compressor inlet for receiving a medium, a compressor for compressing the medium, a compressor outlet for discharging the compressed medium and a compressor muffler. The compressor muffler includes a housing defining an inner space, an inlet for receiving a compressed medium, a muffling structure located in the inner space, wherein the muffling structure has a plurality of chambers for receiving the compressed medium from the inlet, an outlet for discharging the compressed medium and a flow path located in the inner space; The flow path communicates the inlet with the muffling structure and the muffling structure with the outlet; A method for reducing any noise-generating frequencies present in a compressed medium is additionally presented.

Abstract: An air pump for a fish-tank comprises a compartmental air chamber assembly formed by a base plate and a casing in the body. Hence, an indirect prolonged air path is formed in the air chamber assembly, resulting in a great reduction of noise generated while operating.

Abstract: An air turbine apparatus for use with a combustion engine either as a muffler or as an air intake device is comprised of a housing defining an expansion chamber and an airfoil positioned within the housing. The airfoil includes a central aperture extending longitudinally therethrough that is in fluid communication with both the inlet and the outlet of the housing. The airfoil is configured to allow gases flowing through the inlet to flow between the outer edge of the airfoil and the housing and through the aperture of the airfoil. In addition, the air traveling through the housing is caused to spin as it travels through the housing. This rotational flow increased the rate of flow of gases through the air turbine device. A chop core is provided between the airfoil and the outlet of the housing to encourage turbulent flow of gases without restricting flow to produce a muffling effect and thus a dampening of noise from the combustion engine.

Abstract: The transverse partition for separating an exhaust volume into two adjacent chambers includes at least one gas flow passage between the two chambers, the gas flow section through the passage being modifiable under drive from the difference between the pressures on the two sides of the partition. The partition comprises a wall pierced by at least one slit defined between two adjacent edges of the wall, which wall is elastically deformable under drive from the difference between the pressures on the two sides of the partition, between a rest position in which wall continuity is ensured, the two edges of the slit being substantially touching, and a deformed position in which the two edges of the slit are spaced apart so as to define said gas-flow passage between them.

Abstract: A muffler has an elongated generally cylindrical casing having inlet and outlet ends, an elongated generally frustroconical baffle in the casing adjacent the inlet end with the smaller diameter portion being spaced from the inlet end. The peripheral wall of the baffle has closely spaced perforations over the major portion of its axial length and is spaced from the shell to provide a chamber thereabout. A generally cylindrical baffle has one end extending over the smaller diameter portion of the frustroconical baffle and has its peripheral wall spaced from the casing to provide a chamber thereabout. The peripheral wall of the cylindrical baffle has closely spaced perforations over most of its length. Exhaust gases enter the frustroconical baffle and exit through the perforations therein, move axially in the casing thereabout, and then pass through the apertures into the cylindrical baffle.

Abstract: In-line exhaust systems comprise an exhaust pipe, and a sound-attenuating baffle in the exhaust pipe. The baffle has one or more baffle plates extending across the gas flow channel, at least one at an oblique angle. Each plate has an array of apertures therethrough. The plates are joined to each other, preferably in edge-to-edge relationship, preferably forming included angles with each other and forming preferably different, oblique angles to the longitudinal axis. In preferred embodiments, plate aperture area increases, plate-to-plate, along the direction of advance of gases in the exhaust system. A backwash valve can lie over one of the baffle plates. The exhaust system can include a water jacket, and optionally an outer sound attenuation chamber. The baffle is preferably 36 or less inches long, the exhaust system reducing noise by at least 3 decibels.

Abstract: Within an exhaust duct are positioned a plurality of concentrically arranged, open ended, right cylinders supported axially within the exhaust duct, wherein each of the cylinders includes an inlet end and an exit end. The inlet ends are positioned in sequential downstream order from the outermost of the cylinders to the innermost of the cylinders. The cylinders are graduated in length sequentially with the outermost cylinder being shortest in length and the innermost cylinder being longest in length. The inlet ends of each of the cylinders provide a circular leading edge with a sawtooth conformation. An elongated smooth rod is positioned on the longitudinal axis of the exhaust duct with a downstream end of the rod providing a flared portion positioned at the mouth of the innermost of the cylinders.

Abstract: A muffler and method of making a muffler is disclosed wherein the muffler is formed from a single sheet showing four portions separated by three folds lines and wherein the two center portions are formed with tube outlines such that when the center portions are folded 180°, the tube outlines on the center portions abut to provide an exhaust path and wherein the two outer portions are folded over one of the center portions respectively to define two chambers surrounding the tubes and wherein end caps are provided to enclose the chambers.

Abstract: A muffler assembly for muffling noises associated with a compressor. The muffler assembly is mounted on the compressor such that the two move as a solid body. The muffler assembly includes an intake having a hollow interior adapted to receive a first flow of gas from the ambient environment. A baffle disposed in the hollow interior of the intake restricts the flow of gas through the intake. In one embodiment, the baffle defines at least a portion of a plurality of fluid portals that separate the first flow of gas into a plurality of flows of gas as the gas passes from a first side of the baffle to a second side of the baffle. As a result, the first flow of gas is disturbed and noise from the compressor is thereby attenuated. In another embodiment, a plurality of baffles are disposed in the hollow interior of the intake to define a tortuous path for the flow of gas through the intake for attenuating noise.

Abstract: Disclosed herein is a silencer for reducing acoustic energy in a flow of exhaust gas from a combustion power source which prevents rain or snow from entering an exhaust stack without the need for a weather cap or hood. The silencer achieves acoustic energy attenuation and precipitation diversion with a minimal increase in backpressure. The silencer comprises a chamber at least partially defined by a chamber wall in communication with an inlet port for introducing exhaust gas into the chamber and an exhaust port for exiting exhaust gases from the chamber. The inlet port may be in communication with an inlet collar for attachment to an exhaust stack. A housing at least partially surrounds the chamber wall to form at least one cavity between the chamber wall and the housing where acoustic absorbing material is disposed. A deflector is at least partially disposed within the chamber having a gallery portion in communication with the channel.

Abstract: A high performance muffler is used to modify sound waves of exhaust gases generated by a high performance internal combustion engine. The muffler has an inlet for connection to an internal combustion engine exhaust system. A muffler body is connected to the inlet. The muffler body has a shell which has a width greater than its height. The shell includes a pair of spaced apart opposed panels. An outlet is connected to the muffler body to receive exhaust gases from the body. The muffler body has a first expansion chamber adjacent to the inlet. The first expansion chamber extends across the width of the muffler body. A first reduced opening is in the muffler body extending across the width of the muffler body. A second expansion chamber is in the muffler body adjacent to the first reduced opening. The second expansion chamber also extends across the width of the muffler body. A second reduced opening extending across the width of the muffler body communicates with the second expansion chamber.

Abstract: A muffler for automotive vehicles. The muffler includes a passageway, an inlet at one end of the passageway, and a single outlet or dual outlets at the passageway's other end. The portion of the muffler connected to the inlet is substantially untapered. The portion of the passageway connected to the outlet or outlets tapers from wide to narrow away from the inlet and toward the outlet or outlets. This tapered geometry results in a very appreciable reduction of heat transmitted from the muffler back to the engine, increases engine performance, and produces a pleasant, deep sound while the engine is running.

Abstract: A silencer, for silencing and purification of exhaust gases, comprises an air-tight casing (1) connected to an exhaust inlet pipe (2) and to an exhaust outlet pipe (3) and contains at least two acoustic compartments (4i, 4ii) and one or more monolithic bodies (5) such as catalysers or particle filters through which exhaust gases flow in a flow direction in longitudinal channels or porosities, and one or more pipes or channels (6, 7), at least one pipe or channel penetrating one or more of the monolithic bodies (5) and guiding exhaust gases in a flow direction which is opposite to the flow direction in the channels or porosities of the monolithic body (5), and at least one of the pipes or channels (6, 7) connecting the at least two acoustic compartments (4i, 4ii). The general flow direction is preferably reversed substantially immediately upstream of a penetrated monolithic body (5) and substantially immediately downstream of either the same monolithic body (5) or of another penetrated monolithic body.

Abstract: An exhaust system for internal combustion engines, in particular two-cycle internal combustion engines, includes a resonance-type exhaust part having at least one diffuser-cone unit formed with a diffuser, a countercone, and a connecting part with a preferably constant cross section extending between the diffuser outlet cross section and cone inlet cross section. In order to provide the resonance-type exhaust part as compact as possible by employing a simple production method, the connecting part is formed as a first deflection arc, preferably with an angle of deflection of about 180°±30°.

Abstract: A muffler for an internal combustion engine having characteristically low back pressure and a pleasing sound is disclosed. The muffler comprises: (a) an elongated housing having an interior wall and including: (i) an inlet opening formed for the flow of exhaust gas into the housing, and (ii) an outlet opening formed for the discharge of exhaust gas from the housing; and (b) a partition shaped like a hollow pyramid, disposed in the housing and having interior surfaces and exterior surfaces, the exterior surfaces joining at a first end to form a pyramidal apex, the pyramidal apex pointing toward the inlet opening, and extending at a second end to form a rugose base, wherein the partition is disposed in the housing to form a plurality of spaces between the rugose base and the housing for the flow of exhaust gas.

Abstract: A silencer for reducing and canceling medium- to low-frequency vibration and noise that generate in the reciprocating internal combustion engines and in the reciprocating air compressors. An inlet pipe having many ports perforated therein in the radial direction is inserted in a hollow triangular pole in the lengthwise direction thereof, the gas is blown into the hollow triangular pole, and the pulsating gases reflected by the walls in the hollow triangular pole are caused to collide with each other to cancel the pulsation.

Abstract: An exhaust system is provided with a structure that separates water from an exhaust stream and also attenuates the noise of the exhaust system. Water laden exhaust is directed from an inlet conduit through a perforated surface to precipitate water from the water laden exhaust stream. After the water is precipitated out of the exhaust stream, the gaseous portion of the exhaust stream continues from the inlet chamber 24 to an outlet chamber 28 and exits from the housing structure by passing through a first outlet conduit. The precipitated water passes from the housing structure through a second outlet conduit.

Abstract: A muffler comprises an outer shell defining a chamber, a baffle positioned in the chamber defined by the outer shell, and an inner plate positioned in the chamber. The inner plate includes a channel and a ridge coupled to the channel. The ridge extends away from the channel. The baffle includes an outer edge positioned adjacent to the outer shell and an inner edge positioned adjacent to the ridge and spaced apart from the channel.

Abstract: Pipe section running along a curve, intended for use in a muffler, comprising two hollow-formed molded parts which are mirror-symmetrical in relation to the radial plane of the curve and which have connected thereto a flat outside edge running in the radial plane along the outside of the curve, which flat outside edges are placed on each other so that the molded parts together form the pipe section, a third flat part being placed at the position of the radial plane between the two molded parts in such a way that a curved edge of said third flat part is situated between the two flat outside edges of the molded parts and is fastened to said outside edges.

Abstract: A muffler (10) having a casing (21), an inlet opening (22) and an outlet opening (26). An initial partition (30) forms an expansion chamber (28). The casing (21) has mounted and formed therein a partition array (34) that includes a divider partition (36), a first intermediate partition (38), and a second intermediate partition (40). Partition array (34) is positioned in a main sound attenuation chamber (46). A collector partition (42) having a collector opening (44) is positioned between array (34) and opening (26). A pre-outlet chamber (48) is formed by collector partition (42) prior to outlet (26).

Abstract: A cylindrically shaped muffler for a gas engine with substantially reduced noise. It includes: (a) a cylindrical shell having a shell-bore, an inlet and an outlet; (b) a plurality of first hollow cones suspended within but is supported by the shell-bore, the first hollow cones having their largest diameters smaller than that of the shell-bore with their apexes pointing toward the inlet of the cylindrical shell; (c) a plurality of hollow truncated second cones having their greatest diameters equal to that of the shell-bore in which they are supported in reverse to the first hollow cones and alternate therewith, so as to have their smallest diameter portions pointing toward the outlet of the cylindrical shell; and (d) a circular stopper suspended inside the hollow truncated second cone near its smallest diameter portion in such a manner to create eddy currents in gas flow so as to absorb noise.

Abstract: An exhaust gas muffler for an internal combustion engine of a portable, hand-guided working tool has a housing having an exhaust gas inlet, and exhaust gas outlet, and an outlet space, wherein the exhaust gas outlet opens into the outlet space. An outlet opening is provided downstream of the outlet space and has wall elements directing the exhaust gas flow in the exit flow direction. A rebound wall is positioned transverse to the exhaust gas outlet and delimits the outlet space while providing a connecting slot into the outlet opening. The connecting slot is spaced at a distance from the outer wall of the housing that extends substantially parallel to the rebound wall. A first ramp is positioned perpendicularly to the connecting slot and slants upwardly from the rebound wall to the outlet opening. A second ramp extends in a direction of longitudinal extension of the connecting slot from an end of the insertion slot opposite the first ramp to the edge of the first ramp opposite the connecting slot.

Abstract: A combined device is provided for positioning between the outlet of a gas turbine and a steam generator. The combined device acts as a sound-absorber and as a diffusor and is designated a gas turbine muffler. The gas turbine muffler has an inner zone which widens out in the flow direction S at a relatively large angle. Deflector elements arranged in this inner zone delineate diffusor channels, that are located between adjacent deflector elements. The diffusor channels widen out in each case at a significantly smaller acute angle of less than 7.degree.. In addition to decelerating the stream of gas and hence, in addition, increasing the pressure, the narrow diffusor channels also bring about sound-absorption by reducing the regions of turbulence, making the stream more uniform, and aligning the stream.

Abstract: A sound attenuating device is provided for use in reducing sound levels associated with a sound source, such as an internal combustion engine. The noise attenuating device, for example, is connected to the exhaust pipe of the engine and receives sound waves and a fluid flow of exhaust gas therefrom. The sound attenuating device includes a housing which defines an interior chamber, an inner deflector assembly extending centrally through the chamber, and a diverter arrangement near an inlet of the housing. The inner deflector assembly is formed from a longitudinal stack of spaced apart tapered deflectors such as inner cones which extend centrally through the chamber and define an annular passage radially between the inner cones and the housing wall. The diverter arrangement diverts the fluid flow to the annular passage.

Abstract: A muffler assembly for muffling noises associated with a compressor. The muffler assembly includes an air intake having a hollow interior for receiving air from the ambient environment when the compressor is operating. A baffle is located within the interior of the intake for restricted passage of the air through the intake. A fluid portal is defined within the baffle for enabling fluid to pass from one side of the baffle to the other side of the baffle and subsequently through said air intake. An attenuator is disposed within the fluid portal for attenuating noise and the attenuator disturbs the soundwaves associated with the operation of the compressor.

Abstract: An exhaust conditioning device, comprising a housing having an entrance duct, an exit duct, and a hollow interior defined within the housing between the entrance duct and the exit duct; a conical baffle carried coaxially within the housing downstream of the entrance duct and configured to form a generally outwardly extending compression chamber therebetween; and a frustoconical baffle carried coaxially within the housing downstream of the conical baffle and upstream of the exit duct and configured to form a generally inwardly extending compression chamber; wherein the conical baffle cooperates with the housing to form a conical vacuum chamber and the frustoconical baffle cooperates with the housing to form a substantially annular vacuum chamber, downstream of the conical vacuum chamber. In one form, the exhaust conditioning device comprises an exhaust muffler. Additionally, a method is disclosed.

Abstract: A noise attenuation system is provided for attenuating noise in exhaust product flowing through an exhaust system. The noise attenuation system includes a tube and an acoustic reflector attached to the tube. The tube includes an inlet end, an outlet end, and an inner surface defining a passageway through which the exhaust product flows. The acoustic reflector includes a tab extending across the passageway. The tab includes a first surface that is convex and faces toward the inlet end of the tube and a second surface that is concave and faces toward the outlet end of the tube.

Abstract: The improved high performance muffler is used to attenuate the sound waves in exhaust gases from internal combustion engines and the like and has a casing, which includes a closed volume defined by side walls, a top wall, a bottom wall and inlet and outlet end caps. The casing also has a defined exhaust gas-flow passageway, which extends between the end caps, which is bounded by upper and lower walls within the casing and the side walls, and which includes inlet and outlet chambers adjacent to the inlet and outlet end caps, respectively. Two spaced apart, gas-flow channels. A gas-flow director assembly, disposed between the side walls and the upper and lower walls, defines two spaced apart gas-flow channels. The gas-flow channels have a uniform, smooth cross-section, and their lengths are substantially equal.

Abstract: An expansion chamber for the exhaust system of two cycle engines. The expansion chamber includes a diverging section and a converging section. The diverging section has a continually increasing cross-sectional area. A terminal section is integrally attached to the diverging section. A reflective cone is disposed within the terminal section and secured thereto. The converging section is defined by the area contained between the terminal section and the reflective cone. Devices are also provide for directing exhaust gases into and out of the expansion chamber. The reflective cone may be positioned entirely within the diverging section or anywhere between the diverging section and the terminal section, depending on specific performance characteristics desired. The reflective cone may also be secure in various ways depending on its placement.