2243 results about "Muffler" patented technology

A compressor assembly may include a shell, a discharge fitting, a muffler, a compression mechanism, and a motor. The shell may have an opening therethrough with the discharge fitting generally extending therefrom. The muffler may be in communication with the discharge fitting and may be external to the shell. The muffler may have an inlet proximate the discharge fitting, an outlet distal from the discharge fitting, and a body portion extending therebetween. The muffler may include a valve assembly proximate the outlet. The compression mechanism may be contained within the shell and include a suction inlet and a discharge passageway. The discharge passageway may be connected to the opening in the shell for direct discharge of refrigerant from the compression mechanism to the discharge fitting. The motor may be contained within the shell and drivingly coupled to the compression mechanism.

The invention provides a thermal behavior experiment system and method under a narrow rectangular channel reflooding cooling condition. The system comprises a heating water storage tank, a nitrogen tank, a steam tank, a shield pump, a preheating section, a first direct-current power supply, a second direct-current power supply, a narrow rectangular channel test section, a steam-water separator, a surge tank, a flow control valve, a silencer and an electromagnetic valve. The experimental working medium is deionized water, and re-submerging cooling experiments under different system pressures, working medium supercooling degrees, heating wall surface heat flux densities, working medium submerging speeds, heating wall surface initial temperatures and channel interior initial liquid levels can be carried out on an experimental section of a narrow rectangular channel structure. The device is suitable for narrow rectangular channel structures with different sizes, and can be used for carrying out re-submerging experiments on experiment sections with single-plate double-channel, double-plate three-channel and more channels. The system pressure and the inlet flow in the submerging process can be kept stable, and it can be ensured that the supercooling degree of a working medium, the heating wall surface temperature and the initial liquid level are controllable.

Provided are a cleaning device and a cleaning system, relating to the technical field of electric devices. A cleaning device (10) comprises: a fan assembly (100), wherein the fan assembly (100) provides a suction force for the cleaning device, and the fan assembly (100) is provided with a second air outlet; an air duct (410); and a first air outlet (430) and a first air inlet (420) communicated with the air duct (410), wherein the first air inlet (420) is communicated with the second air outlet (114) of the fan assembly (100), and a silencer (500) is provided in the air duct (410) so as to reduce noise. The silencer (500) is provided in the air duct (410), such that the noise can be reduced as the noise passes through the silencer (500) along with airflow, and the noise diffused to the outside can be reduced, thereby achieving a noise reduction effect.

The utility model discloses a silencer and an air conditioner. The silencing device is applied to the air conditioner, the air conditioner comprises an indoor heat exchanger, an outdoor heat exchanger, a four-way valve and a compressor, the inlet end of the silencing device is communicated with the exhaust end of the compressor, the outlet end of the silencing device is connected with the four-way valve, and the silencing device comprises at least two silencing branches. Each silencing branch is correspondingly provided with a silencer, and the connection relation between different silencers can be changed; and the controller is used for controlling the connection relationship between different silencers in the silencing device, so that the silencing parameters of the silencing device are changed, and the silencing amount of the silencing device is changed. By means of the air conditioner, noise of different frequencies can be reduced, the noise between the indoor part and the outdoor part of the air conditioner can meet the noise requirement, and the user experience is improved.

Systems and apparatuses include a container for a generator set. The container includes a housing including a cooling room structured to support a radiator and a radiator fan within the housing, an exhaust room structured to support an aftertreatment system, an engine room structured to contain the engine and the alternator within the housing, an air intake system positioned adjacent the engine room, and a control room structured to support control equipment for the generator set. The exhaust room may further support after treatment components including a muffler and an exhaust pipe.

The invention relates to the technical field of silencer machining, in particular to a production and machining control system and method for an air conditioner silencer, and the method comprises the steps: obtaining an equivalent gap of a joint region, and determining whether the joint gap of a welding region is in a standard interval or not; when the joint gap is in the standard interval, the critical stress of the joint area is estimated according to the joint gap of the welding area and the linear expansion coefficient of the assembly material, and the risk level of the copper pipe in the joint area during high-frequency brazing is determined; when the copper pipe in the joint area is at the first risk level, the welding mode of high-frequency brazing is determined according to the critical stress; after the welding mode of brazing is determined, the welding stage where a weld joint is located is determined according to the temperature rising speed, and a corresponding brazing strategy is adopted; the current fluctuation of the induction coil is detected in the high-frequency brazing process, and the initial current frequency is adjusted back according to the fluctuation duration. The dissimilar metal welding defect rate is reduced by adjusting the welding mode and the brazing strategy of high-frequency brazing.

The application discloses a punching device for motorcycle exhaust muffler pipes and particularly relates to the technical field of punching devices, which comprises a supporting frame, a clamping and punching assembly arranged on the supporting frame, the clamping and punching assembly comprising a central cylinder arranged in the supporting frame, one end of the central cylinder being provided with an adjusting circular truncated cone cylinder, and a plurality of clamping blocks being arranged on the middle part of the adjusting circular truncated cone cylinder. The clamping blocks can be synchronously contracted or expanded along the radial direction, and the arc-shaped fitting grooves on the clamping blocks and the rubber pads can stably clamp the motorcycle exhaust muffler pipes with a certain range of outer diameter differences. The punching device can solve the problem that the traditional punching device can only be adapted to single-specification pipes and the time-consuming replacement of molds, greatly improve the universality of the equipment, simultaneously punch different positions of the same section of the muffler pipe, and automatically feed the slip ring through the motor-driven screw rod, so that the clamping, angle adjustment, punching and resetting linkage operation can be completed, manual intervention is reduced, and the operation strength is reduced.

The invention discloses an evaporator and storage equipment, and belongs to the technical field of refrigeration. The evaporator comprises a base plate, an evaporation pipe, a capillary pipe and a silencer, the evaporation pipe is arranged on the base plate, and the outlet end of the evaporation pipe is used for being communicated with the outside; the capillary tube is arranged on the substrate; the inlet end of the capillary tube is communicated with the outside; the silencer comprises a shell and at least one perforated plate, the shell forms a containing cavity, the outlet end of the containing cavity is communicated with the inlet end of the evaporation pipe, the inlet end of the containing cavity is communicated with the outlet end of the capillary pipe to form a heat dissipation loop allowing a refrigerant to flow, the perforated plate is installed in the containing cavity, and a plurality of through holes are formed in the perforated plate. And the axis of the through hole is parallel to the flowing direction of the refrigerant. The silencer is arranged between the capillary tube and the evaporation tube, and the silencer comprises the shell and the perforated plate located in the shell, so that the transition length of a refrigerant from the capillary tube to the evaporation tube is prolonged as much as possible, fluid noise and vibration are weakened, the noise reduction effect is improved, and the use experience of a user is improved.

The present application relates to the technical field of silencer, especially to a silencing assembly and a silencer, the silencing assembly is provided with a first panel, a second panel, a first connecting piece and a second connecting piece; the transparent first panel and the second panel are opposite and spaced apart; the first panel is provided with a plurality of through holes; the first connecting piece and the second connecting piece are opposite and spaced apart; one end of the first connecting piece is connected with the first panel, and the other end is detachably connected with the second panel; one end of the second connecting piece is connected with the first panel, and the other end is detachably connected or hinged with the second panel; the first panel, the second panel, the first connecting piece and the second connecting piece enclose a cavity in the shape of a cuboid. When dust collection affects the silencing effect, the second panel can be detached or rotated to open the inside of the silencing assembly for cleaning, and the dust collection is cleaned away, so that the silencing effect is ensured not to be affected by cleaning the dust collection, which is easy to realize, has higher efficiency and lower cost.

The utility model discloses a claw type compressor pressure release valve and belongs to the technical field of pressure release valve manufacturing. Comprising a valve body, a sealing nut, a silencer, a mounting seat and a valve element assembly, the sealing nut is arranged at an upper port of the valve body, the mounting seat is arranged at a lower port of the valve body, and the valve element assembly is arranged in the valve body and comprises an adjusting rod, a center rod, a spring seat, a spring and a valve element. The middle of the bottom of the valve element extends downwards to form a fixing column, a plurality of fixing supports are evenly distributed on the periphery of the fixing column, a cavity is formed in the space between every two adjacent fixing supports, the valve element is expanded in the radial direction to form a valve element end face, and the valve element end face is placed on the mounting base end face at the top of the mounting base. The fixed support is contained in the inner hole of the mounting base, high-pressure gas enters the cavity from the inner hole to push away the end face of the valve element, and the gas enters the valve body and is finally exhausted from the silencer. The pressure relief valve has the advantages that the working stability of the pressure relief valve can be improved, and the output pressure of the claw compressor is constant.

The object of the present invention is to provide a silencer that does not become brittle at low temperatures even with low-temperature gases, does not cause clogging, and has low resistance. [Solution] The silencer (A1, A2) comprises a gas inlet (4) through which low-temperature gas is introduced, a gas outlet (5) through which the low-temperature gas is discharged, and a gas passage (6) through which the low-temperature gas flows, and is provided with a passage-forming member (1) whose wall surface is made of mesh-like metal, a sound-absorbing material (2) that covers the outer periphery of the passage-forming member, and an exterior material (3) that covers the outer periphery of the sound-absorbing material, thereby reducing the sound emitted from the gas outlet.

Each mixed main body of a plurality of mixed members is formed from a pulverized raw material of a steric shape, of a plurality of pulverized raw materials obtained by pulverizing a layered composite raw material into various shapes including the steric shape and a linear shape. Each mixed glass fiber portion of the plurality of mixed members is formed by a plurality of glass fibers extending by the pulverization from a portion of the mixed main body corresponding to a glass fiber layer. Each mixed glass fiber portion of the plurality of mixed members is located in a labyrinthine path formed between mixed main bodies facing each other among the plurality of mixed members in a stirred mixture body including the plurality of mixed members stirred and mixed in a binder and the binder.

The invention provides an energy-saving type energy storage power generation device based on methanol fuel, belongs to the technical field of methanol fuel power generation, and solves the technical problems that an existing methanol fuel power generation device is slow in ignition, energy cannot be efficiently utilized, the module integration efficiency is low and the like. Comprising a container, a heat exchange gasifier, a heat exchange heater, a methanol reforming fuel cell module, a methanol storage tank, a gasoline storage tank, a methanol fuel generator assembly, two cell modules and two attenuators are arranged in the container, and a water tank is arranged at the upper end of the methanol storage tank; material conveying metering pumps are arranged between the gasoline storage tank and the methanol fuel generator assembly and between the water tank and the heat exchange vaporizer, a material conveying metering pump is arranged between the methanol storage tank and the heat exchange heater, and a silencer, an engine heat dissipation system and a tail gas treatment assembly are arranged at the upper end of the container. The modular container design facilitates transportation and rapid deployment, is efficient, flexible, energy-saving and environment-friendly, and is provided with a multi-stage tail gas treatment and noise reduction system to ensure environment-friendly and low-noise operation.

The embodiment of the invention provides a silencer structure and a compressor, the silencer structure comprises a bottom cover structure, the bottom cover structure comprises a first side and a second side which are opposite to each other, and the wall surface of the first side is used for abutting against a flange part of an upper bearing structure of the compressor; the boss structure is arranged on the bottom cover structure; the transition part comprises a plurality of convex hull parts which are arranged at intervals in the circumferential direction of the bottom cover structure, at least one convex hull part comprises a first boss and a second boss which have different axial distances from the bottom cover structure, and the at least one first boss and the at least one second boss are adjacently arranged in the circumferential direction of the bottom cover structure; and a first exhaust hole is formed between the adjacent first boss and second boss. According to the technical scheme, under the action of the first exhaust holes, the impact direction of the airflow can be changed, and therefore the direct blowing impact force of the high-pressure refrigerant airflow on the rotor is effectively improved.

The invention provides a cooling air duct structure and a generator set. The cooling air duct structure comprises a power body, a first shell, a motor body, a second impeller, a second shell, a silencer body and a third shell. The first shell is arranged on the rear side of the power body, and the motor body and the second impeller are both installed in the first shell. The silencer body and the third shell are both arranged in the second shell, the third shell is arranged outside the silencer body in a surrounding mode, a first exhaust channel is formed between the third shell and the silencer body, and one end of the first exhaust channel is communicated with the second cavity. By reasonably arranging the third shell, the third shell is arranged outside the silencer body in a surrounding mode and forms the first exhaust channel, airflow after cooling the motor body can only enter the first exhaust channel, cooling airflow can directly and fully exchange heat with the silencer body when flowing through the first exhaust channel, and therefore heat of the silencer body is rapidly taken away, and the service life of the silencer body is prolonged. In this way, the cooling effect on the silencer body is greatly improved.

The present invention belongs to the field of noise control, and discloses a low-frequency broadband ventilation duct muffler based on a rough necked Helmholtz resonator. The low-frequency broadband ventilation duct muffler includes a cylindrical shell (1), a ventilation hole (2) and a sound absorption unit (3). A ventilation hole (2) is arranged at the center of the cylindrical shell (1), and the sound absorption unit (3) is uniformly arranged between the ventilation hole (2) and the cylindrical shell (1), and the sound absorption unit (3) is annular; the sound absorption unit (3) includes a rough neck (3-1) and a cavity (3-2), the bottom end of the rough neck (3-1) is connected to the top end of the cavity (3-2), and the cavity (3-2) is arranged at the lower end of the whole low-frequency broadband ventilation duct muffler. The present invention is used to solve the problems that the existing ventilation duct muffler has a relatively high sound absorption peak frequency, a single sound absorption peak, and a relatively low sound absorption coefficient in the low-frequency range.

The utility model discloses a mute damping pneumatic knife which comprises a shell, an air inlet assembly installed in the shell, a moving assembly driven by high-pressure air to reciprocate, a knife head arranged at the front end of the moving assembly and moving up and down along with the moving assembly, an exhaust assembly used for guiding air to be exhausted and a damping assembly. The damping assembly comprises a buffering sleeve, a spring and a guide ring, the guide ring is clamped in the shell, the buffering sleeve and the moving assembly are assembled into a whole and are installed on the shell in a suspended mode through the guide ring, and the spring is installed between the buffering sleeve and the shell. High-pressure gas drives the motion assembly to reciprocate at a high speed to drive the cutter to perform efficient vibration cutting, vibration caused by motion of the motion assembly is effectively reduced through the damping assembly, the cutter is almost free of vibration, the cutting quality is improved, the service life of the cutter is prolonged, and the pneumatic cutter is relatively simple in structure, low in maintenance cost, high in reliability and suitable for popularization and application. And a silencer is also arranged, so that the noise during working is effectively reduced, and a better working environment is provided.

The utility model discloses a pressure regulator with a silencing function, and belongs to the technical field of pressure regulation and stabilization, an internal silencer and an external silencer are additionally arranged on the basis of the structure of an axial-flow type pressure regulator, when a valve cylinder is separated from a valve clack and a valve port seat, gas flows out through a silencing through hole of the internal silencer, and when the gas flow speed is high enough, the gas flow speed is high enough, and the gas flow speed is high enough. The noise reduction through holes can move the frequency spectrum of exhaust noise to high frequency, the audible sound part in the noise frequency spectrum is reduced, and therefore interference of the noise to the environment is reduced, the noise reduction barrel filled with the spring is arranged in the external silencer, when airflow passes through the spring in the noise reduction barrel, the spring in the noise reduction barrel can absorb kinetic energy generated by airflow impact, and the noise reduction effect is improved. When the airflow passes through the rectifying plate at the open end of the external silencer, the airflow passes through the multiple layers of perforated plates, layered diffusion and pressure reduction are achieved, the pressure and the flow speed of the fluid are reduced, meanwhile, the flow direction of the fluid is integrated, impact on the pipe wall is reduced, and the effect of reducing the noise is achieved.

A compressor may include: a lower and upper cylinder each including: a compression chamber configured so that a refrigerant is compressed in the compression chamber and the compressed refrigerant is discharged from the compression chamber, a lower muffler on a lower side of the lower cylinder, and configured to receive, and reduce noise of, the refrigerant discharged from the lower cylinder and discharge the refrigerant to an accommodation space, and a separation muffler in an upper side of the upper cylinder, and configured to receive, and reduce noise of, the refrigerant discharged from the upper cylinder to the accommodation space, wherein the separation muffler is divided from a flow path along which refrigerant from the lower muffler is discharged so that, before reaching the accommodation space, the refrigerant discharged from the lower muffler is divided from the refrigerant discharged from the separation muffler.

The utility model relates to a special oil pumping device for a barreled oil drum, and aims to solve the problems of low efficiency, more oil residues, poor cleanliness, poor adaptability and the like in a traditional oil pumping mode. According to the device, efficient and clean extraction of oil at the bottom of the oil drum is achieved through precise mechanical design and the synergistic effect of parts. Specifically, the device comprises an oil suction pipe, a positioning oil suction disc seat, a spring, a pressure adjusting sleeve, an oil suction pipe positioning plate, a flat-head silencer and the like. The spring and the pressure adjusting sleeve ensure that the positioning oil suction disc seat is tightly attached to the bottom of the oil barrel, and thorough oil pumping is achieved. The filter screen filters impurities to protect the purity of the oil product; the flat-head silencer realizes air communication and prevents external pollution; the oil suction pipe positioning plate adjusts the position according to the size of the oil drum to ensure that the oil suction pipe clings to the inner wall. The oil pumping device has the advantages that oil pumping efficiency and thoroughness are improved, oil purity is protected, applicability and flexibility of the device are enhanced, cleaning cost and environmental pollution are reduced, and the like.

The invention relates to the technical field of compressors. The invention provides an air suction valve plate, a valve group, a compressor, refrigeration equipment and a vehicle. The air suction valve plate comprises a body provided with a plurality of openings; each valve flap is arranged at the corresponding opening, each valve flap is provided with a fixed end and a free end, and the fixed ends are connected with the body; wherein the masses of at least two of the valve tongues are different, and / or the rigidities of at least two of the valve tongues are different. The structure of the air suction valve plate is reasonably arranged, so that the opening and closing frequencies of at least two of the valve flaps are different, in this way, it is guaranteed that in the air suction process of the compressor, an air suction silencer of the compressor and an air cylinder of the compressor are always kept in a communicating state, air suction pressure and pressure fluctuation in the air cylinder in the air suction process are reduced, air suction loss can be reduced, and the air suction efficiency is improved. And the efficiency of the compressor is improved.

The invention discloses a preparation method of a mute tube core layer and a mute tube. The preparation method comprises the following steps: step 01, adding 15-55 parts by weight of polypropylene resin, 0.5-10 parts by weight of a coupling agent, 0.5-5 parts by weight of a lubricant, 0.05-1 part by weight of an antioxidant and 0.1-3 parts by weight of other additives into a twin-screw extruder from a main feeding port of the twin-screw extruder, and melting and mixing to form an intermediate melt; 02, 45-85 parts by weight of barium sulfate is added into a double-screw extruder through at least two side feeding ports of the double-screw extruder, the barium sulfate and the intermediate melt are subjected to melt blending, and a blended melt is formed; and step 03, extruding the blended melt by a twin-screw extruder, and sequentially passing through a melt pump and a pipeline core mold to form the pipe core of the mute pipe. According to the preparation method, the filling proportion of barium sulfate is increased to 70% or above, the material density is larger than 2.4 g / cm < 3 >, and the noise test of a drainage pipe system of the mute pipe prepared through the preparation method is smaller than 20 dB.

The present invention relates to the technical field of laser cutting, and particularly to a laser cutting machine for the processing of composite mufflers, including a mounting block and a laser cutting head fixedly installed on the mounting block. It further includes a machine frame, and on the machine frame, there are provided: a mounting disk and a support disk that are distributed in parallel. Between the mounting disk and the support disk, there are a guiding rod for guiding the movement of the mounting block and a driving rod for driving the mounting block to move along the guiding rod. The laser cutting machine for the processing of composite mufflers provided by this invention cuts out a groove with an isosceles triangle cross-section in the middle of the plate by reciprocating movement of the laser cutting head, which facilitates subsequent re-cutting at the bottom of the groove to cut off the plate. The cut plate is then bent into a cylindrical blank, and a chamfer is formed on the inner side of the blank to facilitate its cooperation with the disk-shaped plate. Moreover, the welding points on the inner and outer sides of the disk-shaped plate and the blank are not in the same plane.

The utility model provides a valve silencer, an electronic expansion valve and an air-conditioning system, which comprise a shell, a first air inlet, a second air inlet, a first air outlet and a second air outlet, wherein the shell is provided with a first inlet and a first outlet for fluid to flow in and out; the flow dividing assembly is arranged in the shell and located at the first inlet, the flow dividing assembly comprises a guide column and a plurality of flow dividing plates arranged around the guide column, and fluid firstly flows and disperses in the circumferential direction of the guide column and then is scattered all around through the flow dividing plates so as to disperse and reduce bubbles in the fluid; and the gathering channels are located in the shell and connected with the flow dividing assembly and the first outlet, and the gathering channels are used for gathering the dispersed fluid and discharging the gathered fluid through the first outlet. According to the valve silencer, the electronic expansion valve and the air conditioning system, the technical problem that noise is large when a large-flow refrigerant enters and exits the electronic expansion valve in the prior art is solved.

The invention discloses an efficient welding method for an exhaust silencer of a motorcycle. According to the invention, breakthrough improvement of manufacturing quality and efficiency is realized through multi-dimensional technical innovation. A high-frequency electromagnetic field resonance stress relief technology is creatively introduced, the metal crystallization behavior is intervened in real time in the welding process, and the thermodynamic equilibrium state of traditional welding is fundamentally reconstructed. Electromagnetic energy directly acts on molten metal in a microscopic particle vibration mode, lattice defects are promoted to be spontaneously repaired in the liquid stage, the deformation cracking risk caused by thermal stress accumulation in a traditional technology is avoided, and microstructure optimization is more synchronously completed. According to the dynamic energy field regulation and control means, the welding strength and toughness of the complex curved surface structure of the silencer are synergistically enhanced, a uniform and compact fine grain structure is formed in a welding seam area, the anti-fatigue performance of a product under the impact of high-temperature tail gas is remarkably improved, meanwhile, the necessary annealing procedure after traditional welding is integrated into in-situ treatment, and the production efficiency is improved. And the production period is greatly shortened.

The invention relates to the field of noise reduction control of power equipment, in particular to a corrugated composite silencer used for reducing low-frequency noise in a transformer. The corrugated composite silencer structurally comprises a corrugated expansion cavity, a high-frequency sound absorption layer, a backflow cavity, an internal perforated plate and a hard wall, the corrugated expansion cavity is a main body part of the silencer and is directly connected with the inlet side and the outlet side of the silencer; the high-frequency sound absorption layer is attached to the outer side of the corrugated expansion cavity and is separated from the corrugated expansion cavity by an internal perforated plate; the backflow cavity is located on the outer side of the high-frequency sound absorption layer and is separated from the high-frequency sound absorption layer through a hard wall and an internal perforated plate. Wherein the corrugated expansion cavity adopts a corrugated wall surface and is used for improving the equivalent acoustic impedance of the silencer structure and improving the low and medium frequency noise reduction effect of the silencer; the high-frequency sound absorption layer is filled with high-frequency sound absorption materials such as glass fiber cotton so as to improve the medium-high frequency noise reduction capacity of the structure. And the backflow cavity is used for specifically absorbing noise with specific frequency at low and medium frequencies. The corrugated wall surface is combined with the backflow cavity, the corrugated composite silencer structure for low-frequency noise reduction in the transformer is designed, and the actual noise reduction requirements of most transformers can be met.

The invention belongs to the technical field of Roots blower parts, and particularly relates to a damping support of a horizontal silencer of a Roots blower, the damping support comprises an outer surrounding annular frame, a retarding ring, a plastic base and a mounting seat, the retarding ring is arranged on the inner side of the outer surrounding annular frame, the plastic base is arranged on the same side of the outer surrounding annular frame, and the mounting seat is arranged at the side end of the plastic base. Through the arrangement of the internal pressure partition ring, the lateral extension seat, the forward stress spring, the displacement column, the linkage damping sleeve, the pressure-bearing supporting foot and the rubber ring, vibration is transmitted out from the circle center of the external surrounding annular frame, and partition conduction is carried out through the internal pressure partition ring. The internal pressure partition ring on the pressed side extrudes in the corresponding direction, and the forward stress spring on the side shrinks and deforms by extruding the displacement column. At the moment, the expanding lantern ring on the side moves synchronously, the adjacent piston push rods on the two sides are pulled through the lateral extending base, and the piston push rods on the two sides move outwards from the interiors of the linkage damping sleeves on the two sides and extrude buffer springs in the linkage damping sleeves.

The invention discloses air tightness detection equipment for an automobile silencer, which comprises a base, a plurality of clamping pieces, a driving device and a transmission mechanism, and is characterized in that the base is provided with a placing station for placing a silencer body, and the clamping pieces are horizontally and slidably arranged at two sides of the top end of the base and are located at two sides of the placing station; the correspondingly matched clamping pieces form a first clamping assembly and a second clamping assembly, the driving device is installed on the base, the transmission mechanism is installed on the base, the input end of the transmission mechanism is connected with the output end of the driving device in a matched mode, and the output end of the transmission mechanism is connected with the clamping pieces in a matched mode. The device has the beneficial effects that firstly, the first clamping assembly completes clamping and positioning, and at the moment, the area, corresponding to the silencer body, of the second clamping assembly is exposed; then the second clamping assembly clamps and positions the silencer body, meanwhile, the first clamping assembly is loosened, the area which is originally shielded by the first clamping assembly is completely exposed, and airtightness detection of the whole surface of the silencer body is achieved.

A muffler for an exhaust system of an internal combustion engine includes a muffler housing having a peripheral wall elongated along a longitudinal axis of the muffler housing. The peripheral wall has first and second end walls. A muffler insert is surrounded by the peripheral wall and is supported thereon. The muffler insert has a retaining wall extending in a direction of the longitudinal axis. The peripheral wall has a peripheral wall opening and a first exhaust-gas routing pipe has a first end region and is positioned with the first end region thereof engaging in the peripheral wall opening. The first exhaust-gas routing pipe has a second end region and is secured by the second end region thereof to the retaining wall. The first exhaust-gas routing pipe is of multi-part configuration and has a first pipe part and a second pipe part.

The invention relates to the technical field of automobile noise reduction, in particular to an active noise reduction composite silencer which comprises a containing shell, a plurality of partition plates are arranged in the containing shell and divide an inner cavity of the containing shell into a pressure relief cavity, a head noise reduction cavity, an expansion cavity, a tail noise reduction cavity and a cavity, an air inlet pipe is connected to the containing shell, and the front partition plate and the rear partition plate are removed. And a first-stage noise reduction mechanism and a second-stage noise reduction mechanism are arranged in the head noise reduction cavity and the tail noise reduction cavity correspondingly, a high-pressure pneumatic valve is further arranged in the head noise reduction cavity, a first exhaust pipe and a second exhaust pipe are arranged in the containing shell, and perforated passive noise reduction mechanisms are arranged on the first exhaust pipe and the second exhaust pipe. The first-stage noise reduction mechanism plays a leading role in low-frequency noise reduction, and the second-stage noise reduction mechanism plays a leading role in high-frequency noise reduction, so that in the actual driving process, waste gas noise generated in different driving states of an automobile can be dynamically adapted through the first-stage noise reduction mechanism and the second-stage noise reduction mechanism.