60results about How to "Play a sound-absorbing effect" patented technology

The invention discloses a case for a multifunctional desk computer. The case comprises a main case body and is characterized in that fixing supports are arranged at four corners of the lower end of the main case body, a groove is formed in the upper end of the main case body, a cover plate is rotatably connected in the groove, a locking screw for fixing the cover plate is arranged at the upper endof the main case body, a sliding rod is connected to the side wall, close to the lower end, of the main case body in a sliding mode, multiple buffer devices are fixedly connected to the inner bottomof the main case body, the upper ends of the buffer devices penetrate through the sliding rod and are fixedly connected with soft rubber pads, a computer mainframe body is arranged at the upper ends of the soft rubber pads, placement grooves are formed in two sides of the main case body, supporting plates are fixedly connected to opposite side walls of the placement grooves, a limiting rod is arranged on one side of each supporting plate, and a sliding rail is arranged on one side of each placement groove. The case is simple in structure and strong in function, is provided with the groove convenient to use, has very good heat dissipation and noise reduction properties and has a very good use effect.

The invention discloses a formaldehyde adsorption furniture sheet material and especially relates to a formaldehyde adsorption furniture sheet material. The formaldehyde adsorption furniture sheet material can effectively adsorb formaldehyde. The formaldehyde adsorption furniture sheet material comprises a base plate, a surface plate and a bottom plate, wherein the surface plate and the bottom plate are respectively arranged at two sides of the base plate. The base plate is provided through holes, and an included angle of the through holes and the surface of the base plate is greater than or equal to 30 degrees and less than or equal to 90 degrees. The surface plate and the bottom plate corresponding to the through holes are provided with ventholes. Formaldehyde adsorption particles are arranged in the through holes and have particle sizes greater than diameters of the ventholes.

The invention discloses an environment-friendly oil immersed transformer. The environment-friendly oil immersed transformer comprises an oil tank outer shell, an oil tank inner shell, an iron core and a winding located at the center of the oil tank inner shell, an oil purification device located at the two sides of the iron core and the winding and forms a cavity together with the sidewall of the oil tank inner shell, and a noise reduction device located between the oil tank inner shell and the oil tank outer shell. The noise reduction device comprises a noise reduction interlayer and a cooling interlayer; the noise reduction interlayer which adopts a porous glass wool board has the closest distance to a noise resource and can absorb noise efficiently; as the noise reduction interlayer is installed in the oil tank, diffusion of fiber fines can be avoided, and environment pollution can be reduced; as the cooling interlayer is located between the oil purification device and the noise reduction interlayer, the temperature of transformer oil can be reduced efficiently; as the oil purification device is an enforced purification device arranged in the oil tank, the oil purification device comprises a first purifier used for filtering away nonmetal impurities and a second purifier used for adsorbing metal impurities and has no air exchange with the exterior, the degree of purity of the transformer oil can be increased; and as the noise reduction device and the oil purification device are in mutual coordination, the effect of giving consideration to noise reduction, oil purification and cooling is realized, and good environment-friendly and energy-saving performances are obtained.

The invention discloses a high-strength aluminum alloy door and window. The door and window comprise an outer frame and an inner frame, the outer frame and the inner frame are connected by a hinge, two sides of the outer frame are respectively provided with connecting plates, the connecting plates are fixedly connected with the outer frame, the upper portion of the inner frame is provided with a connecting shaft, the connecting shaft is externally provided with a winding plate, the winding plate is made of a sound absorbing material, and one end of the winding plate and the connecting shaft are fixedly connected. The use of the winding plate cooperates with the connecting shaft made of the sound absorbing material outside the inner frame, which facilitates the retracting of the winding plate, and on the basis of improving the sound absorbing strength, the convenience of use is improved.

The invention relates to an air-conditioning outdoor unit and a piping system of the air-conditioning outdoor unit. The piping system comprises an exhaust pipe, wherein one end of the exhaust pipe is connected with a working port of a four-way valve; the other end of the exhaust pipe is connected with a compressor; a U-shaped pipe section is arranged at the lower part of the exhaust pipe; and a silencer is arranged on one side, close to the compressor, of the U-shaped pipe section. According to the piping system of the air-conditioning outdoor unit, the silencer is arranged on a section, far away from the compressor, of the exhaust pipe; the whole piping system only comprises the single silencer; the silencing performance of the silencer is better than that of the existing silencing structure; the silencer can also serve as a counter weight of the exhaust pipe at the same time; and the whole piping system is low in cost and high in efficiency.

The present invention relates to a ceiling and more particularly to a sound absorbing ceiling. A sound absorbing ceiling comprises a boom and a sound absorbing component, wherein the sound absorbing component comprises a steel structure frame and a polyester fiber sound absorbing panel connected to the steel structure frame; the polyester fiber sound absorbing panel is formed by splicing a plurality of sound absorbing panel blocks mounted on the steel structure frame. The plurality of sound absorbing panel blocks are installed on the steel structure frame, and then are spliced to form the polyester fiber sound absorbing panel, and the polyester fiber sound absorbing panel is used to absorb sound. Since the steel structure frame is used as a support and the sound absorbing panel blocks havesmall sizes, the sound absorbing panel blocks are not subjected to a large force due to its own weight when mounted on the steel structure frame. Therefore, the sound absorbing ceiling has good overall structural strength.

The invention discloses a high-efficiency sound insulation material which comprises an inner layer and an outer layer, wherein the inner layer is arranged at the top of the outer layer, a sound absorption layer is arranged between the inner layer and the outer layer, vacuum cavities are formed at the top and the bottom of the sound absorption layer, resonance membranes are arranged in the vacuum cavities, and a reinforcing sheet is arranged in the sound absorption layer. The high-efficiency sound insulation material disclosed by the invention is provided with the vacuum cavities, the resonancemembranes and the sound absorption layer; sound can pass through the vacuum cavities at first, and the vacuum cavities can greatly obstruct sound transmission; furthermore, the sound can generate resonance on the resonance membranes made of tinfoil after entering the vacuum cavities, so that sound intensity is weakened; finally, the sound enters the sound absorption layer made of a foam materialand is obstructed; thus, a very good sound absorption effect is achieved, and a sound insulation effect is favorable for being improved.

The invention provides an automobile tail gas exhaust device and a method for exhausting automobile tail gas. The device comprises a connecting body (1), a multi-hole-shaped cellular shunt silencer (3), a rotational flow supercharger (9) and a shell (11), wherein the connecting body (1) is used for being connected with an automobile tail gas exhaust pipe, the multi-hole-shaped cellular shunt silencer (3) is connected with the connecting body (1) is a sealed mode, a certain space is reserved between the multi-hole-shaped cellular shunt silencer (3) and the shell (11) to form an air inlet (2), the rotational flow supercharger (9) is connected with the multi-hole-shaped cellular shunt silencer (3), a guide pipe (10) is arranged in the rotational flow supercharger (9), and the guide pipe (10) is communicated with the multi-hole-shaped cellular shunt silencer (3). According to probationary certificate, the device and method are applicable to various gasoline and diesel engine automobiles, the device is reasonable in structure and convenient to install, original performance of the automobiles is not affected, and the energy conservation and noise reduction effect is achieved.

The invention discloses a sound attenuated enclosure for a generator set, and relates to the technical field of the generator set. The sound attenuated enclosure structurally comprises a base, an enclosure body wall and an upper cover, wherein the enclosure body wall is arranged above the base, and the upper cover is movably arranged above the enclosure body wall and is used for sealing the enclosure body wall; the enclosure body wall comprises an outer plastic steel layer, a middle sound-absorption foaming layer and an inner damping layer, wherein the edges of the two side enclosure body walls are provided with two push rods which are convenient to push the generator set, the edge of a certain side of the enclosure body wall is provided with a cooling and ventilating pipe which is of an arc shape, and a round hole faces the bottom surface; the bottom of the base is provided with a pulley, the upper cover is provided with an oil inlet on which a seal cover is arranged, and the seal cover is connected with the upper cover through a hinge; a rubber gasket is arranged on an oil inlet, and the push rod is provided with a rubber sleeve capable of increasing the force of friction. The sound attenuated enclosure provided by the invention is simple in structure, and the working noise of the generator set can be greatly reduced.

The invention relates to an inorganic ecological wall material, a preparation method thereof and a use method. The inorganic ecological wall material is prepared from, by weight, 10-20 parts of ash calcium powder, 10-20 parts of heavy calcium powder, 10-20 parts of zeolite powder, 10-20 parts of tourmaline, 10-15 parts of white cement, 5-15 parts of talcum powder, 5-10 parts of diatomite, 5-15 parts of barites and 3-5 parts of additives. The properties of negative ions, weak current, adsorption, degradation, bacteria resistance and bacteriostasis and the like of the material are brought into play, the material is achieved by comprehensive effects such as chemical reaction, electrical neutralization and physical absorption, so that indoor air is purified, and living environments are improved.

The invention relates to the field of computer peripheral equipment, and discloses a computer case. The computer case further comprises a shell, the rear side face of the shell is open, the front sideface of the shell is provided with a window, an upper cover plate of the shell is formed by hinging at least two shielding plates end to end in sequence, and the front end of the upper cover plate ishinged to the shell; a hinge end of one shielding plate is provided with an opening, and a hinge end of the other shielding plate hinged to the shielding plate is provided with a clamping block clamped in the opening; the inner side face of a hinge end of the upper cover plate is provided with an elastic box, the upper side face of the elastic box is provided with an upper opening located in theopening, the lower side face of the elastic box is provided with a lower opening, and the upper opening and the lower opening are provided with non-return devices which can only be opened upwards; a box body is movably connected into the shell through a guide rail, one side face of the box body is open, and the rear end of the box body is provided with an airbag capable of being in contact with the rear end of the upper cover plate. By means of the technical scheme, accessories in the case are conveniently maintained or replaced, and the heat dissipation and dust proof effects of the case areimproved.

The invention relates to a multi-stage silencing structure for an all terrain vehicle. The structure comprises an air inlet pipe, an air outlet pipe and a silencer shell. The multi-stage silencing structure also comprises a plurality of buffer pipes, an air flow dispersing plate, primary filter screens, a secondary filter screen, a primary silencing layer and a secondary silencing layer. The plurality of buffer pipes comprise an arc-shaped end portion and a plurality of buffer pipes arranged in an array, and the buffer pipes and the arc-shaped end portion are integrally formed; one end, extending into the silencer shell, of the air inlet pipe communicates to the arc-shaped end portion, and the air outlet pipe extends out of the other end of the silencer shell; the air flow dispersing plateis fixed to the connection of the air inlet pipe and the arc-shaped end portion; the primary filter screens are arranged in the plurality of buffer pipes; the end portions of the buffer pipes are close to the primary silencing layer, the primary silencing layer and the silencer shell are in interference fit, the secondary silencing layer and the primary silencing layer form a cavity, and the secondary silencing layer and the silencer shell are in interference fit; the secondary filter screen is arranged close to the air outlet pipe, and the secondary filter screen is compressed to the silencer shell. The multi-stage silencing structure provided by the invention purifies and treats tail gas while achieves multi-stage silencing.

The invention discloses a wood cutting device. The wood cutting device comprises a machine base, vertical plates are both welded on the two sides of the outer surface of the top of the machine base, avertical frame is welded to one side, close to the vertical plates, of the outer surface of the top of the machine base, a partition plate is arranged on the inner side wall of the vertical plates, and a chip collecting groove is fixedly connected to the outer surface of the bottom of the machine base; and a clamping mechanism is arranged on the portion, close to one side of the partition board,of the inner side wall of one side of the vertical plates, a fan is welded on the outer surface of the top of the vertical frame, the side wall of one side, far away from the fan, of the vertical frame is connected with a side air channel in an embedded mode, and the two ends of the vertical plate in the length direction are fixedly connected with a first rotating roller and a second rotating roller correspondingly. According to the wood cutting device, a wood cutting line cannot be easily deviated when wood is cut, the cutting plane is guaranteed to be smooth, and the cutting effect is improved; and in addition, a vibration reduction rod is additionally arranged, so that the vibration generated when a cutting cutter rotates is further reduced, the operation environment is prevented from being bad finally, waste chips can be conveniently collected, and a better application prospect is brought.

The invention relates to the technical field of machining centers, in particular to a low-noise vertical machining center. The low-noise vertical machining center comprises a main machine and a protective frame. The outer side of the main machine is covered by the protective frame. The main machine comprises a machine frame, a workbench, a machining portion and a tool rest, wherein the workbench, the machining portion and the tool rest are installed on the machine frame. The machining portion is hung above the workbench in a lifting mode. The tool rest is located on one side of the machining portion. The inner wall of the protective frame is provided with an acoustic panel. The tool rest is provided with a silencer. The position, provided with the workbench, of the machine frame is provided with a damping belt. Noise produced by the machining portion in the machining process is isolated through the acoustic panel, the noise is effectively reduced when a tool of the tool rest is replaced through the silencer, vibration of the workbench is relieved through the damping belt in the machining process of the machining portion, a protection effect can be effectively achieved, and meanwhile noise brought by machining can be effectively reduced.

The invention discloses a noise elimination device for a heating and ventilation air conditioner ventilating system. The noise elimination device comprises a noise eliminator body which is in an L shape, the tip of the horizontal end of the noise eliminator body is connected with an air feeding pipe, and a flange disc used for connecting is fixed to the air feeding pipe; an air outlet is formed inthe lower part of the vertical end of the noise eliminator body, and a first convergence plate and a second convergence plate are fixed to the inner side of the noise eliminator body; a plurality ofdiagonal holes are formed in the first convergence plate and the second convergence plate correspondingly; and a conical convergence plate is mounted between the second convergence plate and the firstconvergence plate. The design is novel, through the arranged first convergence plate and second convergence plate and the diagonal holes formed in the first convergence plate and the second convergence plate, air passing through the interiors of the diagonal holes can be blown towards the center line of the first convergence plate or the second convergence plate, thus the air entering the interior of the noise eliminator body is gathered towards the middle, the situation that the air is blown towards the side wall of the noise eliminator body is reduced greatly, collision between the air andthe side wall is reduced, and the noise elimination effect is achieved.

The invention discloses an oil-immersed on-load voltage regulation power transformer which comprises a support rack, a tank body, a water conveying pipeline and a heat radiation device, wherein coilsare uniformly arranged inside the tank body; an oil storage tank is mounted on one side of the top of the tank body; an oil conveying pipeline is connected with the bottom of the oil storage tank; oneend of the oil conveying pipeline is connected with the coils and extends outside the tank body; a controller is mounted on one side of the tank body below the oil storage tank; a thin metal piece isarranged on side surfaces of the coils inside the tank body; fins are uniformly connected with one sides of the thin metal pieces; a vacuum plate is arranged at the top end inside the tank body; anda temperature sensor is mounted at one end of the vacuum plate inside the tank body. As a heat blocking layer is arranged at the top of the vacuum plate, sound absorption cotton is uniformly arrangedinside the vacuum plate below the heat blocking layer, and grooves are uniformly formed in the bottom of the vacuum plate, noise can be conveniently collected, a certain silencing effect can be achieved, and noise pollution can be reduced.

A straight-tube-type front shock absorber with high performance comprises a tube body, a piston pipe arranged in the tube body and a front fork pipe arranged on the exterior of the piston pipe in a sleeving mode. A restoration valve is arranged at the lower end of the front fork pipe, a screw plug is connected to the upper end of the front fork pipe in a screwed mode, and a piston head matched with the restoration valve is arranged at the upper end of the piston pipe. The restoration valve, the inner wall of the tube body and the outer wall of the piston pipe define a compression cavity, the inner wall of the front fork pipe, the outer wall of the piston pipe, the piston head and the restoration valve define a restoration cavity, and an oil storage cavity is defined among the screw plug, the inner wall of the front fork pipe and the piston head. A first spring is arranged in the restoration cavity, a second spring is arranged in the oil storage cavity, and a damping hole is formed in one side of the upper portion of the piston pipe. According to the straight-tube-type front shock absorber with the high performance, the buffering function can be ensured while the production cost isreduced, and thus the performance of the straight-tube-type front shock absorber is ensured.

The invention discloses an exhaust system silencer for an automobile, and belongs to the field of automobile parts. The exhaust system silencer for the automobile comprises a shell, a partition plateand an inner silencing pipe, wherein the shell is provided with an inner cavity, one end of the inner cavity is in communication with a middle pipe of an exhaust system, the other end of the inner cavity is in communication with a tail pipe of the exhaust system, the partition plate is arranged in the inner cavity, a through hole is formed in the partition plate, and the partition plate divides the inner cavity into a front chamber and a rear chamber; the front chamber is in communication with the middle pipe, and the rear chamber is in communication with the tail pipe; and the inner silencingpipe is arranged in the rear chamber through an annular plate, the rear chamber is divided into a first rear chamber and a second rear chamber by the annular plate, one end of the inner silencing pipe extends into the second rear chamber. Due to the fact that the shell is internally provided with the partition plate and the inner silencing pipe, the silencing effect of the exhaust system silenceris better, and the comfort of the automobile is improved.

The invention discloses an air outlet device of an air conditioner in a theater. The air outlet device comprises an air outlet of the air conditioner. The air outlet of the air conditioner is formed in a wall body, is provided with flow guide plates and comprises a main air opening and side air openings, the main air opening is formed in the middle of the wall body, the side air openings are formed in the periphery of the wall body, the main air opening is separated from air supply channels of the side air openings, more than two protruded flow guide plate cylinders are arranged on each flow guide plate in the corresponding one of the main air opening or the side air openings, the air outlet of the air conditioner is fixed onto a sound-proof wall, the sound-proof wall comprises a sound absorbing wallboard, sound absorbing holes are formed in the sound absorbing wallboard, a sound absorbing cavity is arranged at the rear of the sound absorbing wallboard and is of a hollow structure, and more than two protruded small cylinders are arranged in the sound absorbing cavity. The air outlet device has the advantages that air can be individually supplied from multiple directions, energy consumption can be reduced, and certain sound attenuation effects can be realized for sound which is transmitted into the air outlet of the air conditioner.

The invention discloses a wide-breadth magic buckle product and application thereof. The wide-breadth magic buckle product comprises a hook surface and a hair surface; the hook surface fabric and the hair surface fabric are connected; an adhesive layer is compounded on the back of the hook surface; the hair surface can be a fabric after napping of a single piece; and the breadth is more than 30 centimeters. The wide-breadth magic buckle product can be used as a floor material or a wall material and has the advantages of convenient spreading and sticking, convenient splicing, cleanness, environmental protection, and the like.

The invention discloses noiseless communication equipment, which comprises a communication equipment cabinet body, wherein two side of the interior of the communication equipment cabinet body are provided with partition plates, a plurality of sets of supporting plates are arranged between the partition plates, a plurality of heat dissipation holes formed in each supporting plate, a heat dissipation fan is arranged above the supporting plates, vacuum cavities are formed in one side, away from the supporting plates, of each partition plate, a plurality of groups of anechoic chambers are arrangedinside each vacuum cavities, each anechoic chamber comprises an anechoic outer shell, the inner side of each anechoic outer shell is provided with an anechoic inner shell, and an air inlet is formedin one side between each anechoic inner shell and the corresponding anechoic outer shell. The noiseless communication equipment has the beneficial effects of reasonable design and simple structure. Compared with the traditional communication equipment, the noiseless communication equipment effectively improves its heat dissipation performance, and effectively reduces its noise effect, thereby effectively ensuring living and working environments of people.

The invention discloses a construction technology of a wall surface soft package structure. The construction technology comprises the following operation steps of first layer erecting of a wood base layer, second layer erecting of the wood base layer, room external corner and internal corner treating, secondary levelling of the wood base layer, fireproof and anti-corrosion coating applying, covering of a first layer of a soft package module, covering of a second layer of the soft package module, sound absorbing board covering and ground elastic rubber board laying, wherein a kicking line is set to be 12 cm above the ground, and levelling is conducted by adopting ground elastic rubber boards with the thickness of 4 mm. The construction technology is reasonable, after the wall surface soft package structure is applied to an interrogation room and a toilet room, the sound insulation effect is good, leakage of case details is avoided, and good economic and social benefits are achieved upon application and popularization.

The invention relates to a damping buffer device, which comprises a pipe body, an end cover, a pull rod, a piston group and a spacer, wherein one end of the pipe body is an open end; one end, which is far away from the open end, of the pipe body is the bottom part of the pipe body; the end cover is arranged at the open end of the pipe body; the end cover and the pipe body are hermetically fixed; the spacer is arranged in the open end the pipe body; damping liquid is arranged between the bottom part of the pipe body and the spacer; after penetrating through the end cover and the spacer, one end of the pull rod extends into the pipe body; one end, which is located in the pipe body, of the pull rod is provided with the piston group; at least one flow channel arranged along the axial direction of the pipe body is formed in the inner wall of the pipe body; the at least one flow channel is gradually reduced and then gradually increased in cross sectional area from one end to other end. According to the damping buffer device disclosed by the invention, buffer resistance can be effectively regulated in a closing process of sliding members of furniture, so the smoothness of the sliding members in the closing process can be ensured; the damping buffer device can also exert buffer action.

The invention discloses an automobile glass lifter mechanism, and relates to the technical field of automobile glass lifter mechanisms. The mechanism comprises an upper fixed supporting seat, whereina lower fixed supporting seat is arranged right below the upper fixed supporting seat, and a thin screw rod is rotatably connected between the upper fixed supporting seat and the lower fixed supporting seat at the central position. The glass lifter is novel in design, light in texture and low in manufacturing cost; glass is lifted and lowered by driving the thin screw rod through a servo motor; the glass lifter mechanism is different from lifters with a transmission arm type structure and a flexible type structure, the glass lifter mechanism is high in stability and enables vertical linear movement of the glass without deviation all the time; and meanwhile, the problems that a transmission lifter is subjected to abnormal nose and is easily damaged is solved; the practicability is effectively improved; the glass can be buffered to a certain degree when being lifted and lowered through a buffer mechanism, the problem that the glass and a vehicle door can collide when a traditional lifteris lifted is solved, and the use experience of a user is improved.

The invention provides an exhaust pipe for a vehicle. The exhaust pipe comprises a second pipe part, an inner pipe, a metal wire net, a baffle and a ring-shaped blocking piece, the inner pipe is arranged in the second pipe part, and the metal wire net is arranged between the inner wall of the tail end of the second pipe part and the inner pipe; and the baffle is arranged on the inner pipe in a sleeving mode and mounted on the end face of the tail end of the second pipe part, the left end face of the baffle is tightly attached to the metal wire net, the baffle is provided with a plurality of strip-shaped through holes, and the ring-shaped blocking piece is welded to the right end face of the baffle and shields the local parts of openings of the right ends of the strip-shaped through holes.According to the exhaust pipe for the vehicle, and due to the fact the structure is adopted, the silencing effect of the exhaust pipe is excellent.

The invention discloses a ventilating device for refrigeration house fresh-keeping storage, and belongs to the field of refrigeration house fresh keeping. The ventilating device comprises a shell, theexterior of the shell is fixedly sleeved with a mounting plate in a connected manner, the top and the bottom of one side of the shell are fixedly sleeved with an air outlet pipe and an air inlet pipecorrespondingly in a connected manner, an air conveying pipe is fixedly connected to the other side of the shell in a sleeving manner, a muffler sleeve is fixedly connected to the exterior of the airconveying pipe in a sleeving manner, an air exhaust solenoid valve is fixedly installed on the outside of the air outlet pipe, one end of the air outlet pipe is in threaded and sleeved connection with a deodorizing sleeve, and one side of the deodorizing sleeve is in threaded and sleeved connection with a polluted air pipe. According to the ventilating device for refrigeration house fresh-keepingstorage, the deodorizing sleeve, an activated carbon board, a sponge block, a thin pipe and a liquid addition funnel are arranged, in the process of air exhausting of a refrigeration house, chemicaland physical manners are conveniently used for dual filtering of irritating odors in polluted air, the purification effect of the polluted air is improved, the problem of pollution caused by direct discharge of the polluted air into air is avoided, and the living environment of people is protected.

The invention discloses an assembled light-weight wall construction process, which specifically relates to the field of building construction. Connectors are provided between them, and the specific construction steps are as follows: a) Install the filling board into the installation cavity of the wall frame at the bottom, and use screws to fix the position between the filling board and the fixing board; b) Select a wall The panel inserts the spacer at one end into the gap between the filler panel and the mounting cavity. The present invention fixes the position of the adjacent wall frame through the wall panel and the connecting piece, and adopts the fixation in the horizontal and vertical directions respectively to ensure the integrity of the overall wall appearance. The body frame is covered, and the screws used to fix the filler board are covered by the main board, so the possibility of loosening and misalignment caused by external force is greatly reduced, thereby ensuring the service life of the prefabricated wall.

The present invention relates to sewer pipe for building, and is especially silencing sewer pipe with soft inner layer. The silencing sewer pipe includes one outer layer of hard material and one inner layer of soft material, and the soft material can reduce the impact of water to pipe wall, reduce shock and silence. The silencing sewer pipe with soft inner layer may be used widely in buildings.

The invention discloses a muffler for an automobile exhaust system, which belongs to the field of automobile parts. The automobile exhaust system muffler includes: a shell, a partition and an inner muffler pipe. The shell has an inner cavity, one end of the inner cavity communicates with the middle pipe of the exhaust system, and the other end of the inner cavity communicates with the tailpipe of the exhaust system. The partition is set in the inner cavity, and the partition is provided with a through hole. The partition divides the inner cavity into a front chamber and a rear chamber. The front chamber is connected with the middle pipe, and the rear chamber is connected with the tail pipe. Pass; the inner muffler pipe is arranged in the rear chamber through an annular plate, the annular plate divides the rear chamber into the first rear chamber and the second rear chamber, and one end of the inner muffler pipe extends into the second rear chamber. Because the casing of the present invention is provided with a partition and an inner sound-absorbing pipe, the sound-absorbing effect of the present invention is better, and the comfort of the car is improved.