Abstract: A gas guide element with sound absorbent walls for blocking or damping noise spreading into main conduits, the gas guide element comprising a guide element body including a flexible sound absorbent inner hose resistant to mechanical, chemical and caloric load exerted by a gas to be guided; an outer hose; and a soft and flexible sound absorbent intermediate layer of material disposed between said sound absorbent inner and outer hose, said inner hose being composed of a flexible material and having an outer side provided with weighted metal elements, said sound absorbent intermediate layer being composed of a randomly oriented pile of materials, and said guide element body having a gas inlet and a gas outlet and at least one 360° convolution between said gas inlet and said gas outlet.

Abstract: An exhaust muffler for a motor vehicle includes a louver tube having an intake end and an exhaust end. An outer tube, consisting of a frustoconical portion and a cylindrical portion, is concentrically arranged around the louver tube. A plurality of louvers and associated louver holes in the louver tube scoop a portion of gasses from the louver tube into the outer tube. An end cap, which includes an exhaust exit hole in its center, fits into an exhaust end of the outer tube. A plurality of end cap holes are arranged so that gasses leaving the outer tube flow through them. A restrictor disk between the end cap and louver tube includes a central hole coaxial with the louver tube and the exhaust exit hole of the end cap. Restrictor disk holes are in the restrictor disk between the central hole and its perimeter so that gasses leaving the louver tube flow through the central hole and the restrictor disk holes as they leave the muffler.

Abstract: A secondary air injection system for reducing the hydrocarbon emissions of an internal combustion engine that is provided with an air pump supplying air to the exhaust manifold of the engine through a check valve assembly and an elastomeric hose characterized in that a baffle in the shape of a helix is located internally within the hose so as to cause the exhaust pressure waves from the engine and passing beyond the check valve assembly to impinge upon the solid compound surface of the baffle and be divided and diffused as they progress along spiraling paths so as to prevent objectionable noises being generated in the hose by the pressure waves.

Abstract: A blower noise silencer comprises both an air turbulence stage and a noise absorption stage. The air turbulence stage includes a tubular screen enclosing a spiral vane wrapping around a central bore running through the air turbulence stage. The screen is surrounded by a hollow chamber. The noise absorption stage includes a hollow tubular screen surrounded by a chamber packed with sound dampening material. Each chamber in the silencer is closed other than through the screen that it surrounds whereas the screens open at one another and to opposite ends of the silencer to provide air flow movement into and out of the silencer.

Abstract: The present invention relates to a muffler used in a motor vehicle for cooling the engine exhaust gases. The muffler has an internal tubular member defining an internal chamber and a middle tubular member concentric in relation to and supported on the internal tubular member. The internal and middle tubular members form a first ring-shaped chamber adapted to connect to the exhaust pipe. The muffler also has an external tubular member being concentric in relation to and supported on the middle tubular member. The middle tubular member and the external tubular member form a second ring-shaped chamber with a third inlet portion. Hence, engine exhaust gases of the motor vehicle pass through the first ring-shaped chamber and are sufficiently cooled and depressurized by cooling air that passes through the internal and second ring-shaped chambers.

Abstract: A free rotor is mounted to spin freely in a conduit network that is acoustically coupled to a noise source through a working fluid that flows through the conduit network. The free rotor muffles the acoustic perturbations travelling through the conduit network, thus effectively muffling the noise source. The network has at least one extent of conduit and within the extent of conduit. The free rotor is typically mounted with its axis of rotation parallel to the direction of flow of the working fluid. Additional free muffling rotors may be provided, either counter rotating or rotating in the same direction. If adjacent free rotors rotate in the same direction, it is beneficial to provide a stationary blade row between them. The multiple free rotors may be mounted on the same spindle, or mounted on independent spindles.

Abstract: A muffler for reducing acoustic noise contained in a gas flow, such as created by internal combustion engines, air compressors, and blower manifolds. The muffler consists of a conventional sheet metal casing which has an inlet and an outlet at opposite ends thereof. A flow of gas containing acoustic noise flows from inlet to outlet. A plurality of spiral acoustic traps, each of which extend from bottom to top of the casing, have a central axis positioned perpendicular to the gas flow. An opening in each spiral acoustic trap extends into the gas flow to divert some gas into the trap, wherein the gas flows in a circular path so as to degrade and randomize the sound waves into heat, by utilizing a circular mixing process with increased gas retention time.

Abstract: A circular-cylindrical filter muffler includes damping elements (3) arranged with their damping surfaces (11, 12) parallel to the central axis (13) of the filter muffler housing (2), which is cast as a monobloc. The damping elements are arranged in grooves (8) of the housing walls. The damping elements (3) include a damping plate (9) which encases an absorption element (10). In the assembled state the damping plates (9) form, with the coarse filter segments (15) arranged on them on the circumference of the filter muffler, a coarse filter ring which is surrounded by an annular filter (4). The advantages of the invention are, in addition to the simplified production and assembly of the components, the reduction of different components and the lower weight along with improved muffling.

Abstract: A silencer for the primary air intake port of an air compressor which includes (a) a housing defining a cylindrical chamber with an inlet orifice at one end and an outlet orifice at the other and (b) a baffle including (i) a substantially cylindrically shaped portion generally concentrically positioned within the chamber which divides the chamber into a central cylindrical compartment in fluid communication with the outlet orifice and an annular compartment in fluid communication with the inlet orifice, (ii) an opening through the cylindrical shaped portion of the baffle proximate the inlet orifice for providing fluid communication between the central cylindrical compartment and the annular compartment, and (iii) a wing extending generally radially from the cylindrically shaped portion of the baffle into contact with the housing sidewall between the inlet orifice and the opening forcing air flowing into the chamber from the inlet orifice to travel along substantially the entire circumference of the annular co

Abstract: A silencer for the primary air intake port of an air compressor which includes (a) a housing defining a cylindrical chamber with an inlet orifice at one end and an outlet orifice at the other and (b) a baffle including (i) a substantially cylindrically shaped portion generally concentrically positioned within the chamber which divides the chamber into a central cylindrical compartment in fluid communication with the outlet orifice and an annular compartment in fluid communication with the inlet orifice, (ii) an opening through the cylindrical shaped portion of the baffle proximate the inlet orifice for providing fluid communication between the central cylindrical compartment and the annular compartment, and (iii) a wing extending generally radially from the cylindrically shaped portion of the baffle into contact with the housing sidewall between the inlet orifice and the opening forcing air flowing into the chamber from the inlet orifice to travel along substantially the entire circumference of the annular co

Abstract: An automotive muffler and dust catcher assembly comprising a muffler attached to a dust catcher, the muffler having an intake pipe for guiding a motor vehicle's exhaust emission into the dust catcher, and an outlet pipe for exhaust of intake gas, wherein the motor vehicle's exhaust emission is guided into the muffler by the intake pipe, forming into a turbulent flow of gas to stir up and heat water contained in the dust catcher and permitting particles in the exhaust emission to be carried in the water and gathered in a non-woven dust bag inside the dust catcher, and permitting the vibrating waves produced by the exhaust explosion of the motor vehicle's exhaust emission to be gradually absorbed by the moving flow of water in the dust catcher.

Abstract: An apparatus is set forth to limit differential pressure during opening of the water faucet, wherein the apparatus includes a housing with a series of spaced parallel diffuser plates mounting a diffuser medium therebetween, wherein the diffuser plates direct fluid flow coaxially of the plates to a surrounding cylindrical channel, and wherein the channel is directed forwardly of a forward solid end plate and through a directional cylinder into an associated water faucet.

Abstract: A variable displacement wobble plate type refrigerant compressor includes a plurality of axially reciprocating pistons. A drive shaft rotates the wobble plate and thereby reciprocates the pistons within their respective compression chambers. Gaseous refrigerant is admitted to each compression chamber through a suction valve and discharged from each compression chamber through a discharge valve. Each discharge valve opens to a common discharge cavity. A hub is rotatable supported about a fixed axis within the discharged cavity, or downstream of the discharge cavity. A plurality of blades pivotally extend from the hub. A compression spring is disposed inside the hub for biasing the blades toward a flat condition.

Abstract: A noise suppressor for a pneumatic tool characterized by a plurality of annular or spiral suppression grooves on the inner wall of the body of pneumatic tool and a plurality of air being holes at the bottom of the suppression grooves on a side wall so that compressed air discharged can have its flow disturbed by impingement upon the suppression grooves and side wall and thus the time of discharge is prolonged and the noise from discharge of the compressed air is suppressed.

Abstract: A noise converter according to this invention is provided with gas conducting spiral passages defined between spirally twisted outer and inner tubes polygonal in cross-section. A gaseous body generating noise flows through the gas conducting passages from one end to the other. Since noise is generated by masses of particles of gaseous body having energy, particles of less energy move forward along a course near the center of each spiral passage whereas those of more energy along the other course near the outside of the passage due to centrifugal force, thereby dispersion and attenuation of energy being performed.

Abstract: The silencer device set forth herein in its various embodiments consists of at least one channelling bounded by at least one turn of a flat spiral, or of a cylindrical helix, or of a tapered helix, which may be blanked-off or open at one of its ends or at both of its ends, and/or incorporate radial holes or frontal holes in one or both faces. The outermost turn of the spiral, or the outermost surface of the helix, may either provide the shell of the device, or form a part thereof.

Abstract: The present invention discloses a sound muffling system which utilizes natural forces such as destructive resonance, coriolis effect, and ramcharging effect to provide a highly efficient low back-pressure muffler for internal combustion engines, compressors, and other machines emitting a pulsed gaseous stream. The system utilizes inlet and outlet coaxial flow tubes with radial ports and a stator/baffle located concentrically in an outer shell.

Abstract: Means for accelerating the discharge of exhaust gas from an internal combustion engine, adapted to be mounted to the end of the engine exhaust pipe, in which exhaust gas from the engine is swirlingly guided by a plurality of spiral blades disposed in a tubular member, to form a super low pressure space at the center of the exhaust gas flow, thereby to accelerate the discharge of the exhaust gas.

Abstract: An exhaust gas control system has a guiding pipe with a proximal inlet end for connecting to a distal end of an engine exhaust pipe. An expanding portion of the guiding pipe has a central rearward expanding cone and spiralling blades extending between the cone and the walls of the expanding portion. The expanding portion is followed by an axially decreasing chamber and then an axially increasing chamber to the distal opening. A duct is supported on radial vanes around the latter chambers. The duct has a forward opening slightly rearward of a maximum cross-sectional dimension of the guiding pipe and has an outlet positioned rearward of the distal opening of the guiding pipe.

Abstract: An exhaust system for an internal combustion engine which comprises an exhaust manifold connected to said engine, a communication pipe connected at one end to the exhaust manifold, a bellows type exhaust tube connected at one end to the other end of the communication pipe, a second communication pipe connected at one end to the other end of the exhaust tube, a muffler connected at one end to the other end of the second communication pipe and a tail pipe connected at one end to the other end of the muffler. The exhaust tube comprises a multi-layered bellows, a cylindrical wire blade, or wire mesh shield, in outwardly radial spaced relationship to the bellows, the opposed ends of the cylindrical wire mesh shield having a reduced diameter, and retainer rings securing the opposed ends of the wire mesh shield to the communication pipes.

Abstract: An exhaust gas control system has a proximal end for connection to a distal end of an exhaust pipe and has a first divergent and convergent and second divergent portions. Curved spiralling blades extend around inner walls of the first divergent and convergent portions leaving an open central space about which exhaust gas whirls. The second divergent portion exhausts the swirling gas through a distal opening. A duct surrounds the convergent and second divergent portions and controls flow of ambient air over those portions.

Abstract: An air cleaner to remove particulate matter from an air stream, and to dampen sounds emitted to the air cleaner by an internal combustion engine receiving air from the air cleaner. Such sounds are commonly conducted upstream through conventional air cleaners and are heard emitting from the inlet of the air cleaner. The air cleaner of this invention both effectively cleans the air and diminishes said sounds. The air cleaner has a partition dividing its interior into a unit chamber holding a filter element unit, and a passage chamber receiving air to be cleaned and conveying it to an opening in the partition leading to the unit chamber. The shape and location of the passage chamber assist in the reduction of sound transmitted upstream.

Abstract: An absorption muffler for flowing gases and particularly for exhaust gases from internal combustion engines comprises a housing which is of oblong shape and has spaced apart semicylindrical short side walls, with long side walls on each side which are synclinally drawn in the middle thereof. Parallel inlet and outlet pipes are connected into the front wall and extend substantially up to the rear wall, and they are located in substantially parallel relationship centered within the respective short side wall semicylindrical portions. An inlet channel is defined on the interior of the housing which extends in a helical curve around the inlet pipe, which in one embodiment has a single convolution and in another embodiment has a plurality of convolutions. This inlet channel connects to a similarly constructed outlet channel designed around the outlet pipe through an obliquely extending connecting channel. The inlet channel comprises either a single convolution or a plurality of convolutions.

Abstract: An automobile exhaust gas muffler construction for flowing exhaust gases, comprises a housing having spaced apart semi-cylindrical end walls interconnected by tangential straight side walls. The housing also includes a front wall having a tubular inlet extending therethrough and through at least a portion of the housing, and a rear wall with a tubular outlet extending through the rear wall and through at least a portion of the housing. The tubular inlet and tubular outlet each have a gas flow slot passage defined along its length within the housing and gases flow from the inlet through this slot in the housing and through spiral passages defined by sound-muffling walls. The spiral passages of the inlet communicate with an expansion chamber defined in the housing which, in turn, communicates with spiral passages defined around the outlet connection.

Abstract: A silencer consists of concentric spaced apart longitudinally extending shells connecting two bulkheads, each having an outer imperforate face, the space between the faces of each shell containing noise absorbing material such as rock wool. Each shell has a longitudinally extending duct to enable the gases to escape, the duct in the inner shell being offset in relation to the duct in the next shell; the inner shell is connected to the inlet pipe and the gases escape via the duct of the inner shell, then through the space separating the two shells and finally through the duct of the next shell.

Abstract: A two-piece outer casing encloses a volume with a central divider plate which extends the length of the casing. The two portions of the casing are bolted or otherwise clamped about the divider plate. Each half of the outer casing has angled inner ribs or diverters. The diverters in one casing extend at an opposite angle to the longitudinal axis of the central plate as do the diverters of the other outer casing. The inner edges of the diverter seal against the surface of the central plate. The transverse dimension of the central plate is less than the transverse dimension of the diverters and the outer casing such that an exchange aperture is defined between the central plate and the inner surface of the outer casing between adjacent pairs of diverters. The casing has an exhaust input port and an exhaust outlet port at opposite ends and opposite sides.

Abstract: A tuned pipe exhaust for a two cycle internal combustion engine for snowmobiles and the like includes a conically shaped converging megaphone section terminating in a small end tube. An absorptive spiral muffler unit is co-axially secured to the end tube and includes an inner radial end wall extending radially from the end tube. The muffler unit attenuates high frequency exhaust noise. The space between such end wall and the upstream conical wall of the tuned pipe is enclosed with a tubular resonator wall to define a resonator cavity with coupling opening in the end tube. The cavity and throat opening defines a Helmholtz resonator which attenuates low frequency exhaust noise. The combination of a low frequency reactive section and a high frequency absorptive section creates an effective balanced silencer operating over the normal frequency spectrum of such engines.