Abstract: An elongate exhaust gas muffler (10) for a turbine engine includes a foraminous central exhaust duct (12) which is circumscribed along its length by a plurality of tuned dissipative and reactive noise attenuation chambers (42-48). At an inlet end (16) of the muffler (10) an annular secondary flow inlet (32) is defined about the central exhaust duct and opens to the first sound attenuation chamber (42). A secondary flow of pressurized bleed air is receivable into the first attenuation chamber (42) in the muffler (10).

Abstract: A below ground mining vehicle, and a method for converting an above ground vehicles into the same, which is particularly adapted for transporting workers and/or light equipment. An above ground vehicle, such as a sport utility vehicle, is modified and components are added thereto in accordance with the present invention, to arrive at the below ground mining vehicle. The vehicle includes: a speed limited engine; a transmission having its upper forward speeds disabled; fire suppression means in the vicinity of the engine; a manual fuel shut off valve in the fuel line; an engine intake air shut off valve which closes in response to a temperature sensor detecting an abnormal engine temperature; a battery box enclosing a battery; a circuit breaker serially connected with the battery; fire suppression means in the vicinity of the fuel tank; a fire suppression means in the vicinity of the exhaust muffler; and a back up alarm. The described below ground mining vehicle provides many features and better performance than previously available in below ground mining vehicles and achieves such performance and features more economically than possible with prior art vehicles.

Abstract: A motorcycle covered by a cowl includes a power unit comprising an engine and a power transmission device enclosed by a cover within which an engine fan induces cooling air into heat transfer relation with said engine. A muffler device enclosed by the cowl has an air guide cover within which cooling air inducted into the power unit cover is passed thereinto in order to cool the muffler. According to an aspect of the invention the vehicle body frame has a hollow main frame operative to induce a flow of cooling air and for discharging it into cooling relation with the power transmission device.

Abstract: Control valves suitable for use in nuclear power plants are provided which include a muffler having a cylindrical wall with a plurality of substantially circular apertures spaced substantially equilaterally from one another within a portion of the wall. The apertures can be disposed in a repetitive helical pattern of a substantially equilateral triangle for maintaining consistenet ligament widths in all directions for providing uniform structural strength to the valve.

Abstract: The subject invention is directed to a muffler formed from a plurality of stamped components. The stamped components include at least a pair of plates formed to define an array of tubes there-in. The tubes include a plurality of unidirectional flow tubes each of which carries a portion of the exhaust gas flowing through the muffler. The plurality of unidirectional flow tubes communi-cate with an in-line expansion chamber defined within the muffler. The in-line expansion chamber enables exhaust gas flowing from the unidirectional flow tubes to expand significantly thereby con-tributing to noise attenuation. The muffler may further include at least one external shell defining a chamber which communicates with the tubes or the in-line expansion chamber.

Abstract: A hanger clamp assembly is provided for supporting a muffler body directly from the undercarriage of a vehicle. A band clamp is adapted to encircle the muffler body and a mounting arm of a hanger bracket is disposed between a support plate on the band clamp and the muffler. The band clamp has a force applying mechanism to tighten the sleeve of the band clamp around the muffler and press the support plate against the surface of the muffler. The support plate is substantially longer in the circumferential direction than the mounting arm of the support bracket and thereby provides an extended moment arm to resist rotative motion of the muffler about its longitudinal axis.

Abstract: Apparatus and process are provided for assembling an exhaust system which includes a stamp formed muffler and pipes connected thereto. The muffler is assembled on an indexable fixturing apparatus having a plurality of stations for receiving the formed components of the muffler. Robotic gripping apparatus are provided in proximity to the indexable fixturing apparatus for moving aligned components of the muffler to welders for securely connecting the aligned components to one another. Simultaneously the pipes for the exhaust system are bent into their required configuration by programmable pipe benders. The assembled muffler and the bent pipes are then delivered to a second indexable fixturing apparatus. The loosely assembled components of the exhaust system are indexed into proximity to programmable welders which securely connect the exhaust system components together. The completed exhaust system is indexed into a position for unloading and subsequent shipment.

Abstract: Apparatus and process are provided for assembling an exhaust system which includes a stamp formed muffler and pipes connected thereto. The muffler is assembled on an indexable fixturing apparatus having a plurality of stations for receiving the formed components of the muffler. Robotic gripping apparatus are provided in proximity to the indexable fixturing apparatus for moving aligned components of the muffler to welders for securely connecting the aligned components to one another. Simultaneously the pipes for the exhaust system are bent into their required configuration by programmable pipe benders. The assembled muffler and the bent pipes are then delivered to a second indexable fixturing apparatus. The loosely assembled components of the exhaust system are indexed into proximity to programmable welders which securely connect the exhaust system components together. The completed exhaust system is indexed into a position for unloading and subsequent shipment.

Abstract: A liquid heating apparatus of the type which includes a liquid vessel assembled within a support frame, a pulse combustion burner mounted to the vessel and having a combustion chamber secured at its inlet end to a side wall of the vessel and immersed in liquid in the vessel, a tailpipe connected at its one end to an exhaust port of the combustion chamber and being extended outwardly through the vessel, and an exhaust muffler assembly connected to an exhaust end of the tailpipe. The exhaust muffler assembly includes a plurality of mufflers connected in series to the exhaust end of the tailpipe, a final one of the mufflers being in the form of a resonance type muffler for reducing low frequency noises caused by pulse combustion in the combustion chamber. The final one of the mufflers is detachably mounted in place at the outside of the support frame for easy replacement with another resonance type muffler and connected to the preceding muffler in a disengageable manner.

Abstract: A method and apparatus for muffling motor vehicle engine noise comprises conventional noise attenuation apparatus and techniques as well as a tuning circuit for delivering separate signal outputs to at least two transducers separated along the length of the exhaust conduit. A spacing between the transducers corresponds to the range of tuned exhaust lengths required at various engine speeds within the operating range of the motor vehicle engine. The tuning circuit varies the strength of the signal delivered to each of the transducers to vary the cancellation point within the conduit so as to vary the effective length of the conduit in a manner that maintains a minimum or negative pressure pulse at the valve exhaust port and aids in the exhaustion of combustion gases from the cylinder. As a result, engine performance is improved throughout the operating range of the motor vehicle engine.

Abstract: A compact, sound-attenuating muffler for an internal combustion engine or the like. The muffler has a divergently tapered partition located near the inlet of the muffler for dividing the exhaust gases into two pulse streams with similar sound frequencies to achieve sound attenuation when the streams are converged back together. The diverging partition creates a low-pressure volume or region on the partition's downstream side where unignited fuels may accumulate. The partition is formed with a passageway to provide communication of live fire from the inlet of the muffler to the low-pressure volume for ignition of any unignited fuel. A method of communication of live fire from the inlet of the muffler to the low-pressure volume on the downstream side of the diverging partition in the muffler also is described.

Abstract: A compressor discharge gas muffler comprising a single expansion chamber and an impedence tube for attenuation the fundamental low frequency discharge gas pulses, and a side outlet positioned to attenuate higher frequencies. A method of attenuation is also disclosed.

Abstract: A muffler for attenuating pulsations within the hydraulic fluid of an hydraulic elevator includes a plurality of compressible elements for absorbing pressure pulsations within the fluid and a baffle for ensuring that the flow of fluid contacts the elements sufficiently to absorb such pulsations, the baffle allowing a certain amount of flow to pass therethrough so that the pressure drop around the baffle is not so extreme so as to cause the muffler to cease to function.

Abstract: An engine exhaust system is suspended from a power plant and a car body by a suspension apparatus so as to support an exhaust pipe, at a plurality of points, from a power plant system. A muffler is connected to the engine exhaust pipe and suspended, at a rear end of the muffler only, from the car body. The elastic suspension member includes an elastic block to be attached to the power plant or car body and a rigid bracket to hold the exhaust system.

Abstract: The invention relates to an improved muffler for an automobile that filters the exhaust and eliminates noise and odor as well as forces steam back into the engine to improve gas mileage. The muffler uses replaceable cartridges that serve as filters to divide the muffler into chambers that filter and eliminate the noise of the exhaust. Each filter can be removed and cleaned as the need arises.

Abstract: An exhausting apparatus for a four-cycle four-cylinder engine having four cylinders each provided with an exhaust port comprises four exhaust pipes connected to corresponding exhaust ports of the engine cylinders. The four exhaust pipes are classified into first and second groups in accordance with ignition timings and the first and second groups of two exhaust pipes each are shifted in connection with the ignition timings by means of an angle of 360° with respect to each other. Exhaust chamber members including two exhaust chambers each, are in communication with front portions of the exhaust pipes respectively through means of communication holes and two communication pipes, one connecting the first group of the exhaust pipes and the other connecting the second group of the exhaust pipes. The downstream ends of the exhaust pipes are connected to a collecting cylinder having its interior separated by means of a separator into two sections into which the first and second groups of the exhaust pipes are arranged, respectively. A collecting exhaust pipe is connected to a downstream end of the collecting cylinder member and a muffler is mounted upon the collecting exhaust pipe.

Abstract: An active muffler for motor vehicle exhaust conduits comprises a pulse tracking sensor generating a signal input to an electronic control for actuating an acoustic transducer imposing cancellation pulses upon the sound pressure pulse train travelling through the conduit. The system includes a preconditioning circuit for reducing the crest factor of the waveform pulse train travelling through the exhaust conduit by introducing negative pressure pulses into the exhaust conduit. Preferably, a digitally controlled one bit injector includes a fluid outlet in communication with the exhaust conduit and an inlet in communication with a vacuum source such as the intake manifold of the motor vehicle engine. Accordingly, the amplifier and the transducer of the acoustic actuator can be substantially downsized for employment in mass produced motor vehicles.

Abstract: The present invention relates to a mechanism capable of simply making a low sound volume performance on the piano, and more particularly to a muffler for pianos, which includes a flat muffler member of a cushioning material provided slidably on a damper guide holder, and which is adapted to make a low sound volume performance on the piano by striking strings by hammers with the flat muffler member of a cushioning material advanced to a position between the hammers and strings, and a regular sound volume performance thereon by striking the strings by the hammers directly with the muffler member slidingly retreated to its normal position.

Abstract: The muffler structure is of the type which comprises a shaped tubular body (1), an end whereof is fixed to the exhaust coupling of the engine whereas a silencer (7) with a catalyst (8) which extends inside the body (1) is associated with the other end. The structure is characterized in that it comprises in the body (1), which is externally insulated, a pre-catalyst (9) located proximate to the engine's exhaust port. The pre-­catalyst (9) is suitable for raising the temperature of the exhaust gases to values sufficient to activate the catalyst.

Abstract: A stamp formed muffler includes upper and lower internal plates and upper and lower external shells secured to the respective internal plates. The internal plates are formed to include arrays of channels that are placed in register with one another to define an array of tubes. The external shells are formed to define chambers that surround selected tubes formed by the internal plates. The upper internal plate includes at least one pair of aligned channels disposed in spaced apart end-to-end relationship and in register with a continuous channel in the lower internal plate. The chambers of the external shells are separated from one another by baffle creases. The baffle crease of the upper external shell is disposed in registration with the spaced apart aligned channels of the upper external shell. As a result, the baffle crease of the upper external shell is substantially free of pockets that conceivably could trap foreign materials.

Abstract: A muffler for muffling engine operating sound and including a double-walled cylindrical shell closed at opposite ends by double-walled closure caps. The space between the shell walls is filled with sound-absorbing solid particles. The shell is partitioned into three axially contiguous chambers. A gas charging pipe projects through one closure cap and axially within the shell, and has two pairs of facing discharge elbows for discharging gas from the charging pipe at locations in the first chamber. A first pair of gas transfer pipes extends from the first chamber into the central chamber to points of opposed gas discharge. A second pair of gas transfer pipes extends from the central chamber into the third or discharge chamber, and from this location, the gas passes out of the muffler via a discharge pipe.

Abstract: A sound absorbing muffler (12) for a compressed air driven motor (10) has first and second mutually confronting end walls (28, 34) connected by four side walls (30). A pad of sound absorbing material (52) constructed from SAE No. F-7 polyester felt is contained in the muffler housing (26). An entrance port (42) at the center of the first end wall supplies exhaust to the interior volume (32) of the muffler housing (26). A series of depressions (44, 46) in the first end wall (28) disperse the exhaust over a first planar surface (54) of the pad of sound absorbing material (52). The porosity of the sound absorbing material (52) permits the exhaust along with grease, oil or water carried by the exhaust to pass through the pad. The exhaust exits a second planar surface (56) of the pad at the second end wall (34) of the muffler housing (26) and is discharged from the interior volume (32) of the muffler housing (26) through a plurality of louvers (38) provided in the second wall (34) of the muffler housing (26). The sound absorbing muffler provides a compact muffler of reduced size that adequately silences the exhaust of the air motor and does not appreciably restrict the flow of the exhaust through the muffler.

Abstract: A muffler tube for use in a hermetically sealed compressor is disclosed. The muffler tube of the present invention has a roughened outer finish, and has a protuberance extending radially outwardly therefrom, which protuberance is received in a recess in the inner wall of the muffler. The combination of the roughened outer finish and the protuberance connection assist in preventing the muffler from turning on the tube, and from moving vertically on the tube.

Abstract: Methods and apparatuses for cleaning and/or muffling a gas discharge which in one aspect includes a hollow body with a filter element mounted therein through which the discharge gas flows and in which liquids entrained in the gas are filtered out, the body having one or more liquid collection areas from which liquid can be removed from the apparatus for disposal or for re-use. The apparatus also can serve as a noise muffler to reduce the noise level of the gas discharge.

Abstract: A water pump assembly for an aquarium aeration system includes a housing surrounding an electric pump. Within the housing, a water conduit passes an impeller of the pump for the generation of a stream of moving water. An air-breather conduit conducts air from a location above the housing to an air-induction port in a sidewall of the water conduit wherein the moving water produces a venturi action for drawing in air and entraining the air as a series of bubbles in the stream of water. The process of mixing air with the water produces sound. A muffler disposed on top of the housing is connected serial with the air-breather conduit for attenuating the sound to permit a viewing of the aquarium without the distraction of the sound. A valve may be located on an air inlet port above the muffler for adjusting a rate of flow of the air. The muffler incorporates a serpentine corridor for conduction of the air, the corridor comprising a set of baffles or a set of arcuate passages of sufficiently small cross-sectional dimensions for attenuating the sound. The muffler is constructed in different embodiments, each of which may be opened manually for cleaning.

Abstract: The known muffler of an industrial engine, in which a channel communicating with an exhaust gas outlet is integrally formed on the inside of a muffler main body made of an aluminum diecast, and an inner lid is mounted to the open side of the channel to form an exhaust gas passageway serving also as a tail pipe, within the muffler main body as disclosed in Japanese Utility Model Application No. 63-127369 (1988) is improved. The improvements reside in that a cross-section area of the channel is reduced gradually or in a stepwise manner from its inlet towards the exhaust gas outlet so as to prevent carbon from adhering to the exhaust passageway, and in that at the exhaust gas outlet is formed a projecting wall adapted to butt against the inner lid, integrally with the muffler main body so as to prevent the exhaust gas escape without passing through the exhaust gas passageway.

Abstract: A furnace having a housing, a combustion chamber within the housing, and a burner associated with the combustion chamber is provided with a sound enclosure housing including a muffler portion. The muffler portion comprises an elongated serpentine passage having an air opening at one end.

Abstract: PURPOSE:To prevent the counterflow of exhaust gas without using an expansion pipe and improve output by installing an accelerating suction device with the exhaust system pipe in each cylinder and connecting the part between the suction part and the exhaust system pipe of each cylinder in which combustion arises next through a suction passage CONSTITUTION:Each accelerating suction device 70 which is integrally connected on the downstream of mufflers 60 is connected with an exhaust system pipe connected at the exhaust port of each cylinder of a multicylinder two-cycle engine, and the whole of the muffler 60 and the accelerating suction device 70 are covered by a casing 50 The accelerating suction device 70 accelerate the exhaust gas stream which is discharged from a cylinder and introduced into a connection part 51 by the passing in an accelerating part 76 including an accelerating throttle pipe 17 and a throat 72, and a negative pressure is generated in an expansion chamber 73 Then, the negative pressure is allowed to act into the exhaust system pipe of a cylinder in which combustion is carried out next, through a suction passage (not shown on the figure) connected with a connecting part 52, and the exhaust gas in the cylinder is sucked

Abstract: PURPOSE:To reduce noise leakage to the outside by installing an engine duct for leading the cooling exhaust air of an engine on the exhaust air chamber open to the outside of a noise-proof case accommodating a muffler, and placing a duct cover for guiding the cooling exhaust air to a generator open to the exhaust air chamber on the bottom surface of a noise-proof case. CONSTITUTION:An engine 4 and a generator 5 are arranged coaxially in a noise-proof case 1, which are installed on the same supporting base 30 supported at a bottom panel 1e through a vibro-isolating support member 32. Between the lower portion of the engine 4 and the bottom panel 1e of the noise-proof case 1, an exhaust air duct 6 extending in the front/rear direction of the noise- proof case 1 is provided, and the front end of an exhaust air duct 6 is connected to a generator duct cover 7 installed on the rear end of the generator 5. At the rear end of the engine 4, a cooling fan 8 covered with an engine duct 9 is mounted, and the engine duct 9 is opened facing an exhaust air chamber 1A formed on the side of the rear panel 1c of the noise-proof case 1, and a muffler 21 is installed on the top of the exhaust air chamber 1A.