376results about How to "Reduce exhaust noise" patented technology

The invention discloses a multifunctional pressure cooker. The multifunctional pressure cooker comprises a cooker body and a cooker cover, the cooker cover comprises an upper cover body and an inner cover body, and the upper cover body is provided with a water injection port for injecting cooling water to the inner cover body; the multifunctional pressure cooker further comprises a water tank anda shielding cover; the multifunctional pressure cooker has a water-cooled cooking state in which the water tank is installed and a normal cooking state in which the shielding cover is installed, whenthe water tank is installed on the cooker cover, the water tank discharges water to the water injection port, and when the shielding cover is installed on the cooker cover, the shielding cover shieldsthe water injection port. The multifunctional pressure cooker can be used as a water-cooled pressure cooker by installing the water tank and used as a normal pressure cooker without installing the water tank.

A variable area nozzle system for a gas turbine engine includes a fan duct inner wall, a fan duct outer wall disposed in radially spaced relation to the fan duct inner wall, and a fan nozzle. The fan nozzle defines at least a portion of the fan duct outer wall and includes a nozzle aft edge. The fan duct inner wall and the nozzle aft edge collectively define a fan duct nozzle throat area. The fan nozzle is configured to pivot about a pivot axis that may be oriented transversely relative to a longitudinal axis of the gas turbine engine. The fan nozzle may be pivoted from a stowed position to a deployed position in order to vary the fan duct nozzle throat area.

A double-walled exhaust pipe is used with an internal combustion engine and includes a first elongate outer tube and a second elongate inner tube positioned concentrically within the outer tube and affixed at the ends. A chamber is created between the inner and outer tubes which extends substantially their entire length and is sealed against the atmosphere by welding at the ends of the tubes. A one-way valve is affixed to the outer tube and in fluid communication with the chamber so that a vacuum having a negative pressure at least 20 inches of mercury can be drawn. The outer tube preferably has a greater wall thickness than the inner tube.

The present invention relates to internal combustion engine afterheat utilizing technology, and is especially methanol catalytically reforming hydrogen producing apparatus utilizing afterheat of internal combustion engine and its control method. The apparatus includes mainly methanol aqua gasifying cavities in the front part, middle part and back part of the reformer casing, catalytically reacting cavity and reformed gas product cavity. In the middle part inside the reformer casing, there are porous honeycomb ceramic with inside catalytically reacting cavity; and the inner wall of the catalytically reacting cavity has set honeycomb pores with reforming catalyst coated to the inner wall. One heat exchange pipe penetrates the porous honeycomb ceramic axially. The present invention has integrated heat exchange pipe and porous honeycomb ceramic, and possesses compact structure, high heat exchange efficiency, high hydrogen rate and other advantages.

The invention discloses an efficient slotted multi-nozzle enhancing mixing ejector. The efficient slotted multi-nozzle enhancing mixing ejector is characterized by comprising an inject gas inlet main pipe, an inject gas inlet flow dividing pipe, a gas collecting chamber, an inject nozzle gas inlet pipe, a back rectifying plate, a front rectifying plate, an inject nozzle, a straight slotted section of the inject nozzle, injected air flow gas inlet pipe, a mixing chamber and a diffuser. The efficient slotted multi-nozzle enhancing mixing ejector has the advantages of being high in inject efficiency, relatively small in energy consumption, relatively small in length, relatively low in noise and manufacturing difficulty, capable of using high-temperature etchant gas and the like.

The invention discloses a multipurpose cap-shape valve respiratory valve, comprising a valve seat, a valve core and a fixed sleeve; the valve core is of cap shape and made of elastic rubber; the cap rim of the valve core is fixed between the valve seat and the fixed sleeve; the cap body is sheathed in the central hole of the valve seat or the fixed sleeve; furthermore, the top of the cap of the valve core is provided with at least two lancings so that at least one valve clack is formed at the top of the cap. the lancings are distributed all around in a radial pattern from the axle center projected at the top of the cap to form a taper angle shape valve clack, or a C shape, V shape, U shape or opening polygon shape valve clack to cause the end part projected at the top of the cap to form a flip-shell valve clack or cause the lateral side projected at the top of the cap to form at least two valve clacks. The invention has the advantages of simple structure, few faults, long service life, low manufacturing cost, multiple functions and extensive usage, is favorable for environment protection, and has good social and economical benefits.

A rotary internal combustion engine includes an outer housing and an inner housing and an enclosure defined therebetween. At least one of the outer and inner housings is rotatable relative to the other and at least two barriers are disposed in the enclosure and divide the enclosure into a combustion chamber and an exhaust chamber. At least one barrier is rotatable relative to at least one other barrier and at least one barrier comprises a retractable barrier mounted along a pivot axis and is pivotable between an extended position and a retracted position. An intake port, exhaust port, and ignition source are also provided. A method of combusting a fuel comprises rotating a drive member to expand a combustion chamber and substantially isolate the combustion chamber from an exhaust chamber, and introducing and combusting a combustion fluid and a fuel in the combustion chamber as the combustion chamber is expanding.

A noise reduction system for significantly reducing the noise generated by an air turbine used to create suction for automatic cutting tables. The system employs one or more baffles mounted within a closed main housing including noise reduction foam and an exhaust housing lined with noise reduction foam mounted around the baffle exhaust. The direction of the exhaust air is changed 180 degrees and is utilized for cooling the air turbine and electric motor.

A muffler includes a muffler body disposed on a lower portion of an engine and a passage that extends upward from the muffler body and is opened in an upper front portion of a chain saw body. Thus, exhaust gas can be discharged forward from the chain saw body, so that exhaust sounds can be dispersed forward. Consequently, the exhaust sounds propagated to an operator can be reduced and therefore a work environment can be improved. Also, since exhaust gas is discharged after the exhaust gas passes through a long passage extending upward from the muffler body, the exhaust gas can be cooled down. Accordingly, in the chain saw body typically covered with a synthetic-resin case in which exhaust outlets are formed on positions corresponding to outlets of the passage, peripheries of the exhaust outlets can be prevented from being discolored by heat of exhaust gas.

A silencer includes a cylindrical member held between a body connected to an exhaust side of a fluid pressure device and a disk-shaped retaining member. A net-shaped sound absorber is disposed around an outer circumference of the cylindrical member. A pressure fluid flows from the body into the interior of the cylindrical member and is discharged toward the sound absorber through a plurality of first through fifth exhaust holes formed in the cylindrical member. Accordingly, dust in the pressure fluid is removed by the sound absorber, which is formed of a plurality of stacked filters, and further, the pressure fluid is discharged to the outside after exhaust noises have been absorbed by the sound absorber.

The invention discloses an air conditioner outdoor unit which facilitates that the air favorably flows into from the back of the casing and the side suction inlet and at the same time can reduce the air exhausting noise and increases the air exhausting capability. The air conditioner outdoor unit includes the following components: a casing which is respectively arranged with a suction inlet at the back and the side surface and is arranged with a discharging outlet at the front; a heat exchanger which is arranged at the back suction inlet and the side suction inlet at the inner side of the casing; a ventilating fan which is used for discharging air to the discharging outlet and is arranged at the inner side of the casing; a draft tube which is arranged at the discharging outlet for guiding the discharged air; and the draft tube is formed that the height at the side of the side suction inlet is lower than the rest part.

An exhaust system for an engine includes an exhaust pipe connected to an exhaust port of an engine and a muffler attached to the exhaust pipe and configured to reduce exhaust noise. The muffler includes an inner cylinder part connected to the downstream end of the exhaust pipe, an outer cylinder part configured to cover an outside of the inner cylinder part and noise absorbing materials disposed between the inner cylinder part and the outer cylinder part. A plurality of first communication holes providing communication between an inside and an outside of the inner cylinder part is formed in an upstream portion of the inner cylinder part. A plurality of second communication holes providing communication between the inside and the outside of the inner cylinder part is formed in a downstream portion of the inner cylinder part. Guide walls extend toward the inside of the inner cylinder part.

The invention relates to the technical field of compressors, in particular to a scroll compressor. The scroll compressor comprises a fixed scroll and an orbiting scroll, wherein an exhaust buffering cavity which is connected with a compressing cavity is formed in an exhaust region of the fixed scroll; an oil-gas separating device is arranged in the exhaust buffering cavity; at least one first oil groove and at least one second oil groove are formed in an end plate surface, which is attached to the orbiting scroll, of the fixed scroll and are positioned in the periphery of the compressing cavity; the first oil grooves are connected with the bottom of the exhaust buffering cavity through a first channel; and the second oil grooves are connected with a bearing hole of the orbiting scroll through a second channel. By the scroll compressor, the problem that low oil drainage rate cannot be realized while the end plate surface between the orbiting scroll and the fixed scroll is lubricated in the prior art is solved effectively.

The inside of a muffler main body formed from an outer plate into the shape of a cylinder is divided into an upstream-side expansion chamber and downstream-side expansion chambers by partition walls. A catalyst is contained in the upstream-side expansion chamber having a larger volume, and a cylinder-shaped reinforcement member is attached to an inner surface of the outer plate of the upstream-side expansion chamber.

A flow passage control valve for a muffler may include an opening formed through a guide pipe, which forms an exhaust gas channel in the muffler, to form another exhaust gas channel, and a valve body adjusts an open amount of the opening by using a difference between an exhaust gas pressure exerted through the opening and a weight of the valve body.

The invention discloses a device for controlling rotary gas-liquid mixed flow noise. The device comprises a guide vane assembly (100), a vortex control structure (200), a partition plate I (300), a partition plate II (400) and a partition plate III (500) which are sequentially arranged in a tail gas exhaust pipe (12) in an airflow direction; a resonant chamber I (20) is formed in the inner cavity of the tail gas exhaust pipe (12) between the guide vane assembly (100) and the partition plate I (300), a resonant chamber II (30) is formed in the inner cavity of the tail gas exhaust pipe (12) between the partition plate I (300) and the partition plate II (400), and a resonant chamber III (40) is formed in the inner cavity of the tail gas exhaust pipe (12) between the partition plate II (400) and the partition plate III (500); and each of the partition plate I (300), the partition plate II (400) and the partition plate III (500) is provided with a central through hole and an edge through hole. The device has the characteristic of good de-noising effect.

The invention discloses a system for controlling variable air rate ventilating laboratory in segments and is used for leading waste gas generated in a scientific experiment process to discharge outside. The system comprises a frequency conversion fan, a static pressure box, an air valve and fume chambers, wherein a first ventilated section is from the frequency conversion fan to the static pressure box, the frequency conversion fan is arranged on a housetop or outside and is connected with the static pressure box through a ventilating duct; the static pressure box is arranged close to a ventilated terminal, and the specific position of the static pressure box is a geometric center of multiple fume chamber positions; the static pressure box is provided with a pressure sensor, and the pressure sensor can detect air pressure value in the static pressure box so as to adjust the rotation rate of a fan; and a second ventilated section is from the static pressure box to the terminal, the static pressure box is connected with the fume chambers through the ventilating duct, a manual drive air valve is arranged between the static pressure box and the fume chambers and is used for adjusting air quantity, and a motor-driven air valve is arranged and used for variable air rate control in work. The ventilating system provided by the invention adopts a segmentation control mode on ventilation, thereby realizing exact adjustment of each part air quantity and being capable of reducing ventilated noises and ventilated energy consumption.

An automobile-used muffler comprises a box body, a fixing shaft, a rotator, a bearing box and a slide plate; one end of the box body is connected with a tubular air inlet pipe; a first bearing is arranged on the tubular air inlet pipe, and an inclined part is arranged at the other end; a tubular air outlet pipe is connected to the tail end of the inclined part; a second bearing is arranged at one end of the fixing shaft, and a support part is arranged at the other end and is connected with the inner wall of the box body; the rotator comprises a rotating pipe and a connecting part; the connecting part is connected with the connecting pipe; the air inlet pipe is connected with the connecting pipe through the first bearing; rotating plates are arranged on the inner side of the connecting part; a padding plate is connected to the tail ends of the plurality of rotating plates; a hole is formed in the center of the padding plate, and a conical diverting plate is arranged on the padding plate; the bearing box connected to the middle of the inner side of the padding plate; and the slide plate is connected to the outer wall of the bearing box. After passing the guide plate, tail gas flowing in from the air inlet pipe collides with the diverting plate, so that the direction of the tail gas is adjusted, then the tail gas collides with the rotating plates, and after that, the tail gas passes the slide plate to drive the slide plate to rotate. By adopting the invention, the noise can be decreased, the soot and toxic gas can be reduced, and the oil consumption can be lowered.

The invention relates to a wind power and water power mixed power generation device of a cooling tower. The wind power and water power mixed power generation device comprises an original cooling tower module, original wind power generator set modules, original water power generator set modules, an improved filling module, corresponding flow guiding pieces, corresponding supporting structures and other auxiliary devices. The wind power and water power mixed power generation device comprises circulation water (1), a cooling tower shell (2), a filling layer (3), the water power generator set modules (4), the flow guiding pieces (5), the wind power generator set modules (6), a fan (7), a rotation type circulation water spraying pipe (8), a water pump (9) and corresponding control systems. In this way, remaining wind power and water power pressure heads generate power through recycling, the improved filling further improves the efficiency of heat dissipation and other diversified functions, and the wind power and water power mixed power generation device can achieve the purpose of saving energy and reducing emissions sufficiently, and is convenient to machine, install, adjust, renovate, modify and redesign and capable of being widely applied to places where cooling towers are used.

The invention discloses a filtering system for a dust collector. The filtering system for the dust collector comprises a filtering device, a partition board and a flow channel, wherein the filtering device is divided into an air suction filtering device and an exhaust filtering device by a division board arranged in the filtering device; the partition board divides a space between the filtering device and a motor cavity into two parts, namely an air suction cavity and an exhaust cavity and is propped against the back wall of the filtering device; and the flow channel communicates an exhaust hole of the motor cavity with the exhaust cavity. The filtering system for the dust collector reduces parts required by an exhaust port and saves development and material costs; a single filtering system is convenient for a customer to operate and clean; and the flow channel is changed to exhaust forwards from the bottom of a motor shield and then exhaust outwards, so the exhaust noise is greatly reduced.

A ventilating exhaust fan including a housing unit, a motor module, a panel module, and an exhaust assembly is provided. The exhaust assembly fixed on a side surface of the housing unit is improved by replacing single piece stopping flake with two-piece stopping flakes in order to reduce air flow friction, thereby overcoming the shortcoming of existing technique of stopping flake which, relying on gravity for reposition, gives rise to larger air flow friction. Furthermore, the noise of the existing pipeline exhaust fan is also reduced by adopting the methods of injection molding of motor module with volute as one entity, and by adhering to volute bottom sponge layer, which in turn is adhered to the base plate of exhaust fan housing.

The invention provides a hedging type exhaust silencer. The hedging type exhaust silencer is connected to an engine exhaust pipe and comprises a main air inlet pipe which is connected with the engine exhaust pipe, wherein the rear part of the main air inlet pipe is connected with one or more than one hedging device in series, each hedging device is provided with an air inlet, an air outlet and two sections of elbow pipes, the two sections of the elbow pipes are respectively led out from the air inlet and are interacted at the air outlet, the two sections of the elbow pipes are symmetrical corresponding to a central connecting line of the air inlet and the air outlet, a 180-degree angle is formed between airflow path directions in the two sections of the elbow pipes in front of the air outlet, the air inlet of a first hedging device is connected with the main air inlet pipe, and the air outlet of a last hedging device is communicated with a horn-shaped diffusing pipe. According to the hedging type exhaust silencer provided by the invention, the continuous pulse air pressure during an engine exhaust process can be restrained to a large extent, thus the airflow exhausted from the tail end of the hedging type exhaust silencer can be stable and temperate, and the exhaust noise can be reduced to a large extent.

In an air servo cylinder formed by integrally combining an air cylinder, servo valves, and a controller via a manifold block, there are provided, in the manifold block, air discharge flow paths for releasing, to the outside, compressed air discharged associated with operations of the servo valves. In each of the air discharge flow paths, a silencer for reducing exhaust noise is incorporated so as not to protrude from the manifold block to the outside.

The invention discloses a noise reduction chamber used for reducing operating noise of a concrete pump. The noise reduction chamber comprises a hood body (3) for containing the main body of the concrete pump, a hopper hood (1) used for containing a hopper of the concrete pump and communicated with the hood body, and a ventilator. A lateral wall of the hood body (3) is provided with an inlet-outletgate (31) for facilitating the entering and exiting of the concrete pump into or out of the noise reduction chamber. The noise reduction chamber is specially designed for the concrete pump. The hopper hood (1) prevents the noise of the concrete pump from being transferred outside through a hopper part, effectively isolates the noise from the outside environment and reduces the noise pollution tothe environment when the concrete pump works, thereby effectively isolating and absorbing various noises generated during the operation of the concrete pump and reducing the noise pollution caused bythe concrete pump.

A sound adjustable device that varies exhaust-noise having a casing including a sound-dampening material that dampens exhaust-noise, an outer slotted pipe inside the casing, an inner slotted pipe inside the outer slotted pipe, and wherein at least one of the outer and inner slotted pipes is movable with respect to the other to alternately align the slots of the respective slotted pipes for a quieter exhaust-noise and to misalign the slots of the respective slotted pipes for a louder exhaust-noise. The sound adjustable device may also include a heat-shielding material inserted between the casing and the sound-dampening material to shield the casing from heat emitted by the exhaust, and a heat-resistant material may be included in the inner and outer slotted pipes.