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.

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.

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.

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.

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.

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.