32results about How to "Good muffler" patented technology

A leaf blower with a combined front air barrel for noise absorbing and dampening and a rear air barrel for multi-tube dampening is characterized in that filter dampening air tubes 61 are arranged in parallel between the periphery of a motor, front divider cone 52 and divider cone 58a, and the rear air barrel 58, and a resistant muffler is formed; a plurality of noise-absorbing dampening air tubes 65 are arranged in the front air barrel to form a resistant muffler; noise-absorbing material is attached to the inner wall of a chamber of the rear air barrel, inner and outer walls of the front air barrel, and the outer wall of the filter dampening air tube, and porous noise-absorbing material is attached to the inner and outer walls of the noise-absorbing dampening air tubes 65; the inner wall of the front air barrel is provided with a plurality of barbs having a turned right-angled tip; noise-absorbing material 63 is attached by: dipping the parts, with attached noise-absorbing material, of the inner and outer walls of the front air barrel, outer walls of the filter dampening air tubes and inner and outer walls of the noise-absorbing dampening air tubes 65 in glue, extending into debris of noise-absorbing material, moving forward fast on a production line, and drying the parts, with the glue and debris of the noise-absorbing material, in hot blast. There are no previous thoughts of combining an air barrel and a muffler into one product; the leaf blower herein has noticeable effects.

An internal combustion engine, especially of a two-stroke engine in a portable handheld work apparatus, includes an outlet (27) for the exhaust gases which is fluidly connected with at least one inlet opening (13, 14) in an exhaust-gas muffler (1). At least one resonance pipe (6, 7) is mounted in flow direction between the outlet (27) from the engine (20) and the inlet opening (3, 5) into the exhaust-gas muffler (1) in order to obtain a good noise attenuating result and simultaneously make possible an advantageous, space-saving mounting of the engine (20).

The invention provides a two-phase flow parameter detection method based on the porous throttling and acoustic emission technology. The method realizes the combined measurement of porous orifice platebased on differential pressure measurement and acoustic emission technology based flow noise measurement, and solves the problem of noise interference when the two-phase flow is measured by using theacoustic emission. According to the detection method of the invention, the vibration noise of a pipeline itself and the inherent noise of the power source such as a water pump air compressor, and thenoise source from other parts can be eliminated or weakened. At the same time, the method makes full use of the advantages of the porous orifice plate and the acoustic emission technology in the respective measurement modes through a reasonable design, so that the two measurement means are more reasonable and effective in the combination mode, and the two-phase flow quantitative measurement basedon the acoustic emission technology can be realized.

The invention provides a muffler for heating and ventilation air flow in construction engineering, which includes a box structure; a reinforcement structure is installed at the left end of the box structure; an inlet structure is installed at the left end of the reinforcement structure; an inner pipe structure is installed inside the box structure; A noise reduction structure is installed between the inner pipe structure and the box structure; an outlet structure is fixed at the right end of the box structure; the inlet structure also includes a mounting head and a balance ring, and the mounting head is installed at the outer end of the reinforcement structure. The mounting heads are set in four groups in a circular array, and each group of mounting heads is hinged with a balance ring. The balance ring is set as two layers of inner and outer layers. The space is also hinged, so that the balance ring can always maintain a balanced state, so that the installed entrance structure can withstand multi-directional external forces, thus ensuring the stability of the entrance structure.

An air pump comprising: a pump rotor for conveying a gaseous medium; a pump housing in which the pump rotor is rotatably accommodated; a delimiting element closing the pump housing in the axial direction; and a closing element which, together with the delimiting element, forms a muffler. The delimiting element has an opening for transferring the medium between the pump housing and the silencer, and a web extending in the axial direction which surrounds the opening in the radial direction, wherein the closing element is axially Lean against the connecting plate in the direction.

A sound suppressor device for an air drying unit of a compressed-air supply system having a sound suppressor housing on which is arranged an inlet opening for the supply of condensate-laden compressed air to be discharged from the air drying unit and at least one outlet opening for the discharge of the condensate-laden compressed air to the outside, wherein the inlet opening issues into at least one pre-chamber of the sound suppressor housing, which pre-chamber issues into post-chambers which are connected in parallel and which are arranged around a heating rod arranged centrally in the sound suppressor housing.

The invention discloses an assembled sound-absorbing and insulating wall for a broken bridge that can be combined and connected on site. The broken bridge connection assembly that can block the sound bridge between the sound-absorbing module and the wall frame is detachably connected to the wall frame. The broken bridge connection assembly includes the body and the broken bridge connection bolt. On the mounting surface of the sound-absorbing module of the body frame, the body has a hole for the screw to pass through. The sound-absorbing module and the sound-insulating module do not contact each other to form a hollow wall cavity. The sound-absorbing module has a hole for connecting with the body. The connecting plate is fixed by the connecting bolts of the broken bridge, and there is no contact between the sound-absorbing module and the wall skeleton. Each component is easy to be standardized and modularized, has a simple structure, is convenient to install, is easy to repair and replace, and is more conducive to noise reduction.

A blade blowing machine for update product noise reduction and provided with lithium battery drive motor circumferential parallel filtering noise elimination air pipes has the beneficial effects that the machine can better adapt to noise reduction frequency characteristics, at least one filtering noise elimination air pipe 61 in the longitudinal direction of a rear air cylinder is arranged between a motor and a front flow dividing cone head 52 and between the circumference of a flow dividing cone 58a and the rear air cylinder in a parallel manner, noise elimination partition boards 62 are arranged on the position, between the circumference of the flow dividing cone 58a and the rear air cylinder 58, of the cross section, and therefore the filtering noise elimination air pipes 61 in the longitudinal direction of the rear air cylinder can be conveniently mounted, multiple noise reduction holes 60 are formed in the filtering noise elimination air pipes 61, the air cylinder and a noise elimination device are combined into one to make a product, and the effect speaks for itself.

The present invention relates to the technical field of medical respiratory equipment, in particular to an air blowing device for a ventilator, comprising a first housing provided with an air inlet, a second housing fixedly connected to the first housing, and the first housing and The second housing forms an annular accommodation chamber, and the annular accommodation chamber is provided with an air outlet; the annular accommodation chamber is provided with an impeller and a sound insulation board, and the impeller is installed on the rotating shaft and driven by a motor; the first housing and the sound insulation board form a first air chamber, The impeller is located in the first air chamber, the sound insulation board and the second housing form the second air chamber, and the air outlet is located in the second air chamber; there is a gap between the outer edge of the sound insulation board and the first housing. The tuyere enters the first air chamber, enters the second air chamber through the gap under the action of the impeller, and finally flows out from the air outlet. The air blowing device of the ventilator uses a sound insulation board to divide the air chamber into a first air chamber and a second air chamber, and the noise in the two isolated air chambers has less mutual interference and is easy to eliminate.

The invention relates to a U-shaped circulation convection flap propulsion device, which includes a circulation pipeline with an integral hollow structure, the openings at both ends of the circulation pipeline are arranged at relative intervals; a wing plate is installed in the interval between the openings at both ends of the circulation pipeline, An adjustment seat is installed at the end of the wing plate, and the axial direction of the wing plate swinging with the adjustment seat is perpendicular to the connection line between the openings at both ends of the circulation pipeline; one or more sets of axial flow pumps are arranged inside the circulation pipeline along the axial direction, and the circulation The openings at both ends of the pipeline are the inlet and outlet respectively. Under the action of the axial flow pump, the fluid enters from the inlet of the circulation pipeline, flows out from the outlet and passes through the wing plate and then enters the inlet to form a cycle. The fluid generates thrust on the wing plate, so that most of the fluid circulates in the pipeline to generate thrust, while effectively suppressing the generation of the wake characteristics of the existing propeller, and greatly assisting the low-noise and quiet operation of the propulsion device.