32results about How to "Good muffler" patented technology

The exhaust silencer with variable exhaust pipe cross section of internal combustion engine includes one casing, one air inlet silencing pipe and one exhaust silencing pipe inside the casing cavity, three partition boards set inside the cavity to separate the cavity into four chambers and one intermediate silencing pipe. The air inlet silencing pipe has its closed end penetrating the front end cap, the first partition board and two chambers and combining with the second partition board. The exhaust silencing pipe includes two pipes of different lengths and sizes, their closed ends penetrate the back end cap and the last chamber and combine with the third partition board, and the large and short pipe has one exhaust control valve in the opened end. The intermediate silencing pipe has its opened end located inside the second chamber and the closed end inside the third chamber.

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.

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.

The invention relates to the technical field of medical treatment breathing equipment, in particular to a blower device for a breathing machine. The blower device comprises a first casing provided with an air inlet and a second casing fixedly connected with the first casing. The first casing and the second casing form an annular accommodating cavity, and the annular accommodating cavity is provided with an air outlet. An impeller and a sound insulation plate are arranged in the annular accommodating cavity, the impeller is installed on a rotating shaft and driven by a motor. The first casing and the sound insulation plate form a first air chamber, the impeller is located in the first air chamber, the sound insulation plate and the second casing form a second air chamber, and the air outlet is located in the second air chamber. A gap is reserved between the outer edge of the sound insulation plate and the first casing. During operation, gas enters the first air chamber through the air inlet and enters the second air chamber through a gap under the action of the impeller, and finally the gas flows out of the air outlet. According to the blower device for the breathing machine, the sound insulation plate is adopted to divide an air chamber into the first air chamber and the second air chamber, mutual interference of noises of the two separated air chambers is less, and the noises are eliminated easily.

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.

The exhaust silencer with adjustable exhaust pipe cross section of internal combustion engine includes one casing, one air inlet silencing pipe and one exhaust silencing pipe inside the casing cavity, three partition boards set inside the cavity to separate the cavity into four chambers and one intermediate silencing pipe. The air inlet silencing pipe has its closed end penetrating the front end cap, the first partition board and two chambers and combining with the second partition board. The exhaust silencing pipe includes two pipes of different lengths and sizes, their closed ends penetrate the back end cap and the last chamber and combine with the third partition board, and the large and short pipe has one exhaust control valve in the opened end. The intermediate silencing pipe has its opened end located inside the second chamber and the closed end inside the third chamber.

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 invention relates to an automobile exhaust pipe. The automobile exhaust pipe comprises a connecting piece. The connecting piece is internally provided with a fixing ring. The lower part of the connecting piece is connected with a front exhaust pipe body. The tail of the front exhaust pipe body is provided with a three-way catalyst. A middle exhaust pipe body is arranged behind the three-way catalyst. The inner wall of the front exhaust pipe body and the inner wall of the middle exhaust pipe body are each sequentially provided with a thermal-protective coating and a noise reduction coatingfrom interior to exterior. The tail of the middle exhaust pipe body is provided with a particle collecting device. A rear exhaust pipe body is arranged behind the particle collecting device. The innerwall of the rear exhaust pipe body is provided with a noise reduction coating. The middle of the rear exhaust pipe body is provided with a silencer. The tail of the rear exhaust pipe body is providedwith an exhaust port. The inner side of the exhaust port is provided with a filter net. A shock absorber is arranged below the three-way catalyst, and a shock absorber is arranged above the particlecollecting device. The shock absorbers are connected with extension pipes, and the extension pipes are attached to the surface of the middle exhaust pipe body, the surface of the particle collecting device, the surface of the rear exhaust pipe body and the surface of the silencer. The automobile exhaust pipe has the advantages of being good in cleaning effect, capable of carrying out damping and absorbing noise and long in service life.

The invention relates to an external multi-surface intake wall-mounted fresh air ventilator, and belongs to the field of indoor ventilation equipment. The external multi-surface intake wall-mounted fresh air ventilator comprises a main fan filter layer module, an assistance fan module and an adjustable air port module connected in sequence; the main fan filter layer module comprises a shell body, a filter layer and a turbofan; the back surface of the shell body is arranged on the outer side wall surface of a room exterior wall, and is provided with a shell exhaust port; intake through holes are uniformly distributed on the left and right side surfaces of the shell body; the filter layer is arranged on the inner wall of the shell body opposite to the intake through holes; the turbofan is arranged at the middle part of the shell body; and intake ports of the turbofan are respectively towards the left and right side surfaces of the shell body. Compared with the prior art, the main fan filter layer module is mounted on a balcony outside a room, so that the working noise is lower, and the intake quantity is higher; and the part of adjustable air port only exists on an indoor room wall to achieve beauty, simplicity, silence and no influence on the use effect of a large curtain or a large door / window.

The invention discloses a pump body which comprises an upper flange, a lower flange and a cylinder positioned between the upper flange and the lower flange, wherein an air inlet is formed in the lower flange; a corresponding air outlet is formed in the upper flange; at least two middle channels communicated with the air inlet and the air outlet are formed in the cylinder between the air inlet and the air outlet. The invention also discloses a compressor which comprises the pump body. A plurality of middle channels are formed in the pump body and can realize the functions of a muffler, so that muffling can be well realized by a simple structure, a single-frequency or multi-frequency-band muffling effect is achieved, and the muffling range of the pump body is expanded.

The invention discloses a single-cylinder diesel engine with noise reduction function, which comprises a machine body, an identification plate and a diesel tank. The upper end of the diesel tank is fixedly equipped with a fuel tank cover and a suspension ring. One side of the suspension ring is provided with a water tank. An exhaust pipe is provided on one side of the exhaust pipe, and an exhaust muffler is fixedly installed on one side of the exhaust pipe. Fastening bolts are provided on the top of the bottom frame, and an anti-vibration device is provided on one side of the bottom frame. One side of the signboard is provided with a switch, and the other side of the signboard is provided with a starting device, and an oil pump muffler is provided under the signboard. A single-cylinder diesel engine with noise reduction function according to the present invention is equipped with an oil pump muffler, an exhaust muffler and an anti-vibration device to reduce the noise generated during exhaust, and the oil pump muffler can greatly reduce the noise in the oil cylinder. Knocking, reduce noise, prevent body vibration, suitable for different working conditions, bring better prospects for use.

The exhaust silencer of internal combustion engine includes one casing, one air inlet silencing pipe and one exhaust silencing pipe inside the casing cavity, three partition boards set inside the cavity to separate the cavity into four chambers and one intermediate silencing pipe. The air inlet silencing pipe has its closed end penetrating the front end cap, the first partition board and two chambers and combining with the second partition board. The exhaust silencing pipe includes two pipes of different lengths and sizes, their closed ends penetrate the back end cap and the last chamber and combine with the third partition board, and the large and short pipe has one exhaust control valve in the opened end. The intermediate silencing pipe has its opened end located inside the second chamber and the closed end inside the third chamber.

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 object of providing a composite material for thermal insulation and sound insulation, said material having a much better insulating effect than the prior art, is met by the composite material for thermal and sound insulation according to the invention, said material comprising individual flat layers of different materials, wherein at least three layers (1, 2, 3) are used and wherein the material of the outer layers (1, 2) is adapted for weaving through the at least one middle (3) layer. A granular stone layer is applied to an outer soft-meltable bitumen layer (1) with / without powdered stone filling, and on top of this at least one middle layer (3) is applied a final soft-meltable bitumen layer (2) with / without powdered stone filling, wherein the aggregate condition of both outer bitumen layers (1, 2) is selected such that soft-meltable bitumen of the top layer (2) flows through the at least one middle layer (3) to the bottom layer (1), finally cures in the bottom bitumen layer (1) and thus forms a weaving of the at least one middle layer (3).

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.

The invention relates to a U-shaped circulating convection wing plate propelling device which comprises a circulating pipeline with an integrated hollow structure, and openings in the two ends of thecirculating pipeline are oppositely formed at intervals. A wing plate is mounted in a gap between openings in the two ends of the circulating pipeline, an adjusting seat is mounted at the end of the wing plate, and the swing axis direction of the wing plate along with the adjusting seat is perpendicular to the connecting line of the openings in the two ends of the circulating pipeline; wherein oneor more groups of axial flow pumps are arranged in the circulating pipeline along the axial direction, openings at two ends of the circulating pipeline are respectively an inlet end and an outlet end, under the action of the axial flow pumps, fluid flows out from the outlet end after entering from the inlet end of the circulating pipeline and then enters from the inlet end through the wing platesto form circulation, and the circulating fluid generates a thrust force to the wing plates. Therefore, when most of fluid circularly flows in the pipeline to generate thrust, the wake characteristicof an existing propeller is effectively restrained, and the low-noise and quiet operation of the propelling device is greatly assisted.

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 a multifunctional muffler device for rooms, which is characterized in that the device comprises a slablike case composed of a bracket and muffling material covered on the bracket, the case is internally provided with a longitudinal partition board and a transverse partition board, the longitudinal partition board divides the interior space of the case into a front and a rear passage mutually communicated, the transverse partition board delaminates the front and the rear passage, the front and rear walls of the case are respectively provided with an air inlet and an air outlet in the form of strips, the air inlet and the air outlet are respectively communicated with the front and the rear passage of the case. As the multifunctional muffler device of the invention adopts the muffling material and ventilation structure, the device can not only have the effects of noise insulation and noise elimination but also have the effect of natural ventilation when the device is installed on a window and other glass windows are closed, thereby solving the problem of no meeting noise insulation, noise elimination and natural ventilation in the prior art simultaneously.

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.

The invention relates to the technical field of motorcycle fittings, in particular to a silencer structure for a motorcycle. The silencer structure comprises a gas exhaust tube, a tail tube and a housing, wherein the housing is a sealed cavity; two partitions are arranged inside the cavity for dividing the cavity inside the housing into three independent chambers; the gas exhaust tube is connected to the chamber I inside the housing; the chamber I communicates with the chamber III through a connecting pipeline; the chamber III communicates with the chamber II through a connecting pipeline; and high-temperature-resistant fibers are distributed inside the chamber II. According to the silencer structure for the motorcycle, the high-temperature-resistant fibers are designed in the chamber II, so that noises are silenced, and volume is reduced; and sound can be reduced through transmission of the three chambers, so that silencing quality is guaranteed. Meanwhile, dimensions of the three chambers are limited, so that silencing can be performed better, and the effect is good.

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.

A gas pump comprises a pump rotor for conveying a gaseous medium, a pump housing in which the pump rotor is rotatably accommodated, a delimiting element which closes off the pump housing in the axial direction, and a closure element which, together with the delimiting element, forms a sound absorber. The delimiting element has an opening for the passage of medium between the pump housing and the sound absorber, and has a web which extends in the axial direction and which runs around the opening in the radial direction, wherein the closure element bears against the web in the axial direction.

The invention discloses a ridge structure perforated pipe noise elimination unit for a reactive muffler. The ridge structure perforated pipe noise elimination unit comprises a perforated pipe and is characterized in that the segment, arranged in the perforated pipe in the air flow transmission direction, of the perforated pipe in the air flow outlet direction is provided with perforated holes used for improving the low-frequency muffling performance of the perforated pipe; a ridge structure with the resistance reduction characteristics is arranged on the inner wall, in the air flow inlet direction, of the perforated pipe; when the air flow flows the perforated pipe, the air flow is carded by the ridge structure and then flows out of the perforated hole segment. The resistance reduction characteristics of the ridge structure are utilized by the ridge structure perforated pipe noise elimination unit for carding the air flow; and the aerodynamics performance of the airflow is improved. The evenly-distributed perforated holes in the full segment of a common perforated pipe are changed into evenly-distributed perforated holes in the rear portion of the pipe segment; and the low-frequency noise elimination performance of the perforated pipe is improved.

The invention provides a basalt fiber-based sound insulation board, which comprises a foundation, a steel frame fixed on the foundation, and glass plates fixed on the steel frame, wherein the glass plates comprise a front glass plate and a rear glass plate, and a sound insulation layer is arranged between the front glass plate and the rear glass plate. The sound insulation plate is fixed to a concrete foundation, wherein noise entering the space defined by the front glass plate and the rear glass plate can be further weakened or even completely absorbed through the sound insulation layer, andthe influence of the noise on surrounding residential areas is reduced. A network structure is formed in the foam basalt fiber composite board, so that noise can play a good role in noise eliminationafter being reflected many times, foaming agents are arranged in grids, gaps of materials are increased, and noise elimination is better facilitated.

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.

The invention discloses a sheet type efficient silencer. The sliencer comprises a mounting shell and a mounting bracket, the mounting bracket is fixed in the mounting shell in the vertical direction through expansion bolts or bolts or by welding; a first-type sheet silencing body and a second-type sheet silencing body are arranged on the mounting bracket; each of the first-type sheet type silencing body and the second-type sheet type silencing body is composed of a silencing framework, flow guide covers and silencing cotton, the silencing frameworks are filled with the silencing cotton, the flow guide covers are welded to the two ends, in the airflow direction, of each silencing framework, reinforcing supports are transversely welded to the two ends of an inlet and an outlet of the mounting shell, and protective grids are fixed to the two ends of the inlet and the outlet of the mounting shell through bolts. The sheet type efficient silencer has the beneficial effects that the effectivesilencing area is increased by adopting the sheet type silencing body, the sheet type efficient silencer is simple to install and transport and attractive in appearance, and the silencing effect canbe improved; due to the fact that the concave-convex parts between every two adjacent sheet type silencing bodies are arranged in a staggered mode, the circulation rate of the noise elimination cavityis guaranteed, and noise elimination is facilitated.

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).