72results about How to "Improve the noise reduction effect" patented technology

The utility model discloses a pressure regulating silencer with a deslagging function, which comprises a silencing pipe, a pressure regulating sleeve sleeved on the silencing pipe and a silencing outer sleeve sleeved outside the pressure regulating sleeve, a silencing chamber is formed between the silencing pipe and the silencing outer sleeve, a deslagging silencing hole communicated with the silencing chamber is arranged on the silencing pipe, and a deslagging hole is arranged on the silencing outer sleeve. The residue discharging holes are formed in the silencing outer sleeve, so that independent residue discharging paths are formed among the residue discharging silencing holes in the silencing pipe, the silencing chamber between the silencing pipe and the silencing outer sleeve and the residue discharging holes in the silencing outer sleeve, and residues do not need to enter the nail fixing device any more. The nail fixing device effectively prevents the residues from entering the nail fixing device to cause corrosion, jamming and other damage to key components (such as a firing pin assembly), greatly prolongs the service life of related equipment components, reduces the maintenance frequency and cost caused by component damage, does not need to disassemble and assemble the nail fixing device main body to clean the residues in the nail fixing device, and improves the working efficiency. And the overall reliability and stability of the equipment are improved.

The utility model relates to an oilless compressor which comprises a crankcase, the crankcase is connected with an air cylinder box, a crankshaft is arranged in the crankcase and connected with an air cylinder through a connecting rod, the air cylinder reciprocates in the air cylinder box, balancing weights are arranged at the two ends of the crankshaft, a transmission shaft is fixedly connected to the rotating center of the balancing weight on one side, and a transmission shaft is fixedly connected to the rotating center of the balancing weight on the other side. The transmission shaft penetrates through the bearing box to be connected with the transmission wheel, the bearing box is connected with the crankcase, the transmission shaft is connected with the bearing box through a bearing, and the shaft diameter of the transmission shaft is not smaller than one third of the sectional area of the balancing weight. According to the oilless compressor, the balancing weights are arranged at the two ends of the crankshaft, the rotating center of the balancing weight on one side is fixedly connected with the transmission shaft, the crankshaft is supported only through the transmission shaft, vibration of the crankshaft is completely transmitted to the transmission shaft, the crankshaft is not connected with the crankcase, and vibration of the crankshaft cannot be transmitted to the crankcase; vibration of the crankcase can be reduced, and therefore vibration noise is reduced.

The utility model belongs to the technical field of gas film buildings, and particularly relates to a gas film structure capable of effectively reducing sound focusing in a gas film, which comprises a gas film, a steel wire rope, a sound-absorbing plate and a reinforcing rope, a plurality of hanging rings are arranged at the top of the gas film, one end of the steel wire rope is connected with the hanging rings in a hanging manner, and the other end of the steel wire rope is connected with the sound-absorbing plate in a hanging manner. The adjacent sound absorption plates are arranged in an up-down staggered mode, and the reinforcing rope is connected with a plurality of steel wire ropes in a tying and hanging mode. The plurality of sound-absorbing plates which are arranged in an up-down staggered manner can enable part of sound waves reflected by the upper sound-absorbing plate to be reflected by the lower sound-absorbing plate again, so that the sound waves are absorbed for multiple times, and the sound attenuation effect is effectively improved; a plurality of steel wire ropes can be connected into a whole through the reinforcing ropes, and the hanging stability of the acoustic board is improved.

The invention relates to the technical field of air conditioning equipment, in particular to an air treatment air cabinet. The air handling air cabinet comprises a shell, an air duct is arranged in the shell, and the air duct comprises an air return channel, a heat exchange channel and an air supply channel which are sequentially arranged in the air flow direction; the air return channel and the air supply channel are arranged side by side in parallel, so that the air channel is of a U-shaped structure. The heat exchanger comprises a filter module, a heat exchange module, a fan module and a silencing module. According to the embodiment of the invention, the air duct is arranged to be of the U-shaped structure, so that the flowing path of air in the air cabinet is more reasonable, the air flowing resistance is reduced to a certain extent, and the air treatment efficiency is improved. Due to the fact that the filtering module is mainly installed in the air return channel, the space occupied by the filtering module is sufficient, under the condition of the same air passing area, the filtering module can be thicker, the whole unfolded filtering area is larger, the service life is longer, and the replacement period of the filtering module is greatly prolonged.

This utility model discloses a low-resistance, sound-absorbing, enhanced composite fiberglass duct, comprising a duct body and a sound-absorbing inner tube. The duct body includes, from the inside out, a porous aluminum plate layer, a first fiberglass cloth layer, a glass fiber layer, a second fiberglass cloth layer, and an outer protective color steel layer. The surface of the porous aluminum plate layer has multiple equidistantly distributed strip-shaped grooves, and ventilation holes are provided on the inner walls of both sides of the strip-shaped grooves. The sound-absorbing inner tube includes two pairs of upper supports, two pairs of lower supports, a first sound-absorbing aluminum tube, a fiberglass ring, and a second sound-absorbing aluminum tube. By setting the strip-shaped grooves and ventilation holes, the contact area between the airflow and the porous aluminum plate layer can be increased, allowing the glass fiber layer to better absorb sound waves. By setting the sound-absorbing inner tube, sound waves will contact the second and first sound-absorbing aluminum tubes from both the inside and outside sides respectively. Finally, the fiberglass ring can further reduce noise. This utility model effectively improves the sound absorption and noise reduction effect when the wind speed is high or the noise level is high.

The utility model discloses a square cabin detachable partition, including front board, side plate, roof and a plurality of first L shape pressure bar, a plurality of positioning pin is fixed respectively in first L shape pressure bar, and the front board bottom, side plate bottom and roof rear part are fixed respectively a plurality of locating plate, and the locating sleeve of locating plate middle part is respectively inserted in the front board bottom, side plate bottom and roof rear part, when assembling, the locating sleeve of front board bottom and side plate bottom is respectively inserted on the corresponding positioning pin of first L shape pressure bar on square cabin floor, and the locating sleeve of roof rear part is respectively inserted on the corresponding positioning pin of first L shape pressure bar on rear cabin wall. The utility model guarantees that each board piece can be separately disassembled, and the disassembly is very convenient, and each board piece is light in weight, and the transportation is time -saving and labor -saving, and the work efficiency is high. Each board piece is filled with polyurethane foam, and the heat preservation and sound attenuation effect are good, and the first L shape pressure bar and second L shape pressure bar all paste sponge rubber board, and can play waterproof sealing effect.

The utility model belongs to the technical field of sound barriers, and particularly relates to a composite nonmetal sound barrier unit plate. The non-metal sound barrier unit plate comprises a back plate formed by pouring concrete and a face plate made of ceramic particle sound absorption materials, the back plate and the face plate are connected through a damping deformation layer, and the face plate can float relative to the back plate in a damping mode after being impacted by a load. The sound absorption panel of the non-metal sound barrier unit plate can perform damping floating relative to the back plate, so that the non-metal sound barrier unit plate is more impact-resistant and fatigue-resistant, and has the characteristics of high structural strength, lasting vibration and noise reduction effects and long service life.

The application belongs to the field of acoustics, and discloses a low-frequency and wide-band noise reduction acoustic structure and a design method of the acoustic structure. The acoustic structure comprises a plurality of acoustic structural members and an embedded member. At least one embedded member is arranged in the plurality of acoustic structural members. On the same embedded member, the acoustic structural members in communication with the two open ends of the embedded member are arranged in pairs and jointly form a first unit. The acoustic structural member not in communication with the embedded member is a second unit. The first unit and the second unit are arranged in parallel. Compared with the prior art, when sound waves pass through the acoustic structural members arranged in pairs, the coupling resonance generated in the acoustic structural members can widen the noise reduction frequency band at a certain resonance frequency in the low-frequency range. The added embedded member can generate a new noise reduction frequency band. The weak coupling effect between the parallel units can further widen the noise reduction frequency band. Finally, the low-frequency and wide-band noise reduction effect is achieved.

The invention relates to the technical field of airflow silencing, in particular to an automobile airflow silencer which comprises a shell and a shell air inlet. The connecting pipe is connected to the inner wall of the air inlet of the inner shell in an inserted mode, and a rectangular or round hole communicated with the first inner cavity is formed in the outer wall of the connecting pipe. The air inlet pipe is connected to the inner wall of the air inlet of the shell in an inserted mode, and the air inlet pipe corresponds to the connecting pipe in position. The front end of the air outlet pipe penetrates through the outer shell air outlet and then is inserted into the inner wall of the inner shell air outlet, and a rectangular or circular hole communicated with the interior of the outer shell is formed in the outer wall of the lower end of the air outlet pipe. By improving the automobile airflow silencer, the automobile airflow silencer has the advantages of being reasonable in structural design, rapid in silencing, smooth in exhaust and capable of changing the exhaust sound effect, and therefore the problems and defects in the prior art and equipment are effectively solved.

The utility model discloses a deslagging silencer. The deslagging silencer comprises a silencing pipe, a pressure regulating sleeve, a silencing outer sleeve, a heat insulation sleeve and a heat dissipation deslagging sleeve. A first deslagging silencing gap is formed between the heat dissipation deslagging sleeve and the silencing outer sleeve, a second deslagging silencing gap is formed between the heat insulation sleeve and the heat dissipation deslagging sleeve, a first silencing deslagging opening is formed in the outer wall of the heat insulation sleeve, and a second silencing deslagging opening is formed in the outer wall of the heat dissipation deslagging sleeve. The first deslagging and noise reduction gap and the second deslagging and noise reduction gap are communicated through a third deslagging and noise reduction opening in the heat dissipation and deslagging sleeve, and the first deslagging and noise reduction gap is communicated with a binding channel in the silencing pipe through a deslagging channel. The heat dissipation deslagging sleeve is arranged between the heat insulation sleeve and the silencing outer sleeve, impact and corrosion to the heat insulation sleeve can be reduced, the service life of the heat insulation sleeve is prolonged, the heat insulation performance is enhanced, the silencing effect is enhanced, meanwhile, a traditional deslagging mode is changed, residues are prevented from entering the nail fixing device, and the service life of the nail fixing device is prolonged.

This utility model relates to the field of high-gloss wall panel technology, specifically a crack-resistant high-gloss wall panel, comprising a first substrate board, a second substrate board disposed on one side of the first substrate board, a quick-assembly mechanism disposed on the surfaces of the first and second substrate boards, a crack-resistant mechanism disposed inside the first substrate board, and a sound-dampening mechanism disposed inside the first substrate board. This utility model not only significantly improves the assembly efficiency between the first and second substrate boards during use, making the high-gloss wall panel more convenient for users to operate, but also increases the overall strength of the high-gloss wall panel, making it less prone to cracking and more durable. Furthermore, it reduces noise interference, improving users' sleep quality and quality of life, reducing the impact of noise on the wall structure, and extending the building's lifespan.

The utility model discloses a flange plate with sound attenuation groove, including flange plate, auxiliary mechanism, the top of flange plate is ring array and is equipped with mounting hole, auxiliary mechanism is located at the top of flange plate, and auxiliary mechanism is used for carrying out sound attenuation protection to flange plate, and auxiliary mechanism includes sound absorption cylinder, sound attenuation groove, sound absorption subassembly, and sound absorption cylinder fixedly connected in the top of flange plate, and sound attenuation groove is equipped with in the top of flange plate, and sound absorption subassembly is located inside sound absorption cylinder. The utility model discloses a mutual cooperation of sound absorption cylinder, sound attenuation groove, sound absorption subassembly, heat conduction spare, fixed ring and auxiliary sound attenuation cylinder, and sound absorption subassembly is located inside sound attenuation groove, and sound attenuation groove carries out the absorption to the noise of flange plate, and absorption subassembly carries out sound absorption and sound attenuation operation, and auxiliary sound attenuation cylinder carries out sound absorption operation to fixed ring, is favorable in directly carrying out sound attenuation operation on flange plate, is convenient for improving the sound attenuation effect of flange plate, and is favorable in carrying out heat export protection when sound attenuation.

This invention relates to a low-noise optical module three-temperature testing device, comprising a test box with a test cavity formed inside. An air inlet pipe is connected to the test box and communicates with the test cavity. A first silencing cavity is also formed inside the test box, and a first exhaust channel communicating with the first silencing cavity is provided on the test box. A duct is also connected to the test box, connecting the test cavity and the first silencing cavity. By setting up the first silencing cavity and connecting it to the test cavity via the duct, this invention not only extends the gas flow path within the test box and serves to store airflow, but also significantly increases the gas flow area and the diffuse reflection area and number of reflections within the test box, thereby reducing gas velocity and noise energy, achieving noise reduction. The test cavity-duct-first silencing cavity can form a Venturi effect, resulting in better noise reduction.

The utility model discloses a cleaning deoiling device for bolt processing, which comprises a device body and a placing frame, the placing frame is arranged in the device body, the top of the device body is provided with a top cover, the top of the top cover is provided with a pinching plate, the side surface of the device body is provided with a holding groove, and the outside of the device body is provided with a base. A positioning rod is arranged at the top of the base, and the positioning rod is sleeved with a sound insulation cover. According to the cleaning and oil removing device for bolt machining, the base is installed at the bottom of the device body, the sound-proof cover and the sound-proof cotton plate are installed at the top of the base, the work starting device conducts cleaning work, and then the sound-proof cotton plate is installed in the sound-proof cover by a worker and connected with the base; and meanwhile, the positioning rods are embedded in the positioning grooves, so that the noise reduction structure can be installed outside the device body, and the noise reduction effect is high when the noise reduction structure is used.

The utility model discloses a kind of ceiling fastener, sound attenuation voltage regulator and sound attenuation shell, including sound attenuation spacer and heat insulation sleeve, there is deslagging gap between two, sound attenuation spacer is equipped with first deslagging hole, front plugging step, rear plugging step and multiple partition steps, step structure separates first, second deslagging passage and is connected by communicating passage, there is deslagging outlet in the outer ring of front plugging step, first deslagging hole is located in first deslagging passage close to front plugging step side.This design makes ash discharge path zigzag, effectively prolongs deslagging distance, significantly enhances sound attenuation effect;At the same time, the partition step is arranged in the sound attenuation spacer, which reduces the processing difficulty, reduces the working hours and cost, and improves the product competitiveness;The extended deslagging path also buffers the ash speed, avoids high-speed injection, and improves the use safety.

This application provides a muffler, belonging to the field of vehicle technology. The muffler includes a housing, chamber partitions, an intake pipe, a muffler pipe, an exhaust pipe assembly, and a switching valve. The housing and multiple chamber partitions located within the housing enclose multiple muffler chambers arranged sequentially along the length of the housing. The expansion muffler chamber is connected to the intake pipe, and the expansion muffler chamber and the Helmholtz muffler chamber are connected through a muffler pipe located within the housing. The exhaust muffler chamber is located downstream of the expansion muffler chamber along the exhaust path of the muffler, and is connected to the outside of the housing through the exhaust pipe assembly. An exhaust passage is used to connect the expansion muffler chamber and the exhaust muffler chamber. The switching valve is used to open or close the exhaust passage. The expansion muffler chamber is located between the exhaust muffler chamber and the Helmholtz muffler chamber. The muffler of this application embodiment can meet the noise reduction requirements of the engine under different operating conditions and improves the reliability of engine noise reduction under high back pressure.

The utility model discloses a foaming ceramic decorating plate for an outer wall, which comprises a plate body and silencing foam arranged on the plate body, the plate body is provided with a silencing cavity, the silencing foam is placed in the silencing cavity, the plate body is provided with a plurality of transverse clamping grooves and a plurality of longitudinal clamping grooves, the plate body is provided with a plurality of transverse clamping blocks and a plurality of longitudinal clamping blocks, and the transverse clamping blocks and the longitudinal clamping grooves are arranged in a one-to-one matching mode. The plurality of longitudinal clamping blocks and the plurality of longitudinal clamping grooves are arranged in a one-to-one matching manner; when a plurality of plate bodies are spliced, the transverse clamping blocks on one plate body are clamped into the transverse clamping grooves in the other plate body, the longitudinal clamping blocks on one plate body are clamped into the longitudinal clamping grooves in the other plate body, splicing is carried out in the mode, and the plurality of plate bodies can be spliced; due to the fact that the multiple transverse clamping grooves, the multiple longitudinal clamping grooves, the multiple transverse clamping blocks and the multiple longitudinal clamping blocks are arranged, rainwater leakage at the splicing positions can be avoided, the wall is prevented from being affected with damp, the arranged silencing foam can play a certain silencing role, the silencing effect of the plate body is improved, and practicability is improved.

The utility model relates to the technical field of dust removal equipment, in particular to a noise elimination mechanism for dust removal equipment, which comprises a first noise elimination part, the centrifugal fan is arranged on the first silencing part; the second silencing part is arranged on the centrifugal fan; the first silencing part is connected with the centrifugal fan, the silencer is connected with the centrifugal fan, the first silencing part is a cabinet body, a heavy plate is welded to the bottom of the cabinet body, an air pipe opening is formed in the cabinet body, and the cabinet body comprises a metal plate arranged on the heavy plate. Through an assembly composed of the first silencing part, the centrifugal fan, the second silencing part and the silencer, a multi-silencing mechanism is provided for the dust removal equipment so as to reduce noise generated to the outside in the dust removal operation period, the key point is that the fan with large noise pollution is subjected to silencing treatment, vibration noise of the fan body can be reduced, and the service life of the fan is prolonged. And the air flow noise of the exhaust of the fan is weakened, so that the noise of the dust removal equipment forms a maximum area, and a better silencing effect is achieved.

The utility model discloses a refrigeration compressor silencer which comprises a shell and a silencing cover, the silencing cover is fixedly installed on the top of the shell in a clamping mode, an air inlet hole is formed in the side wall of the shell, an air inlet pipe is fixedly connected to the air inlet hole, a first air outlet hole communicated with the interior of the shell is formed in the silencing cover, and a second air outlet hole communicated with the interior of the shell is formed in the silencing cover. A partition plate is installed on the inner wall of the shell, a plurality of first supporting plates are installed at the bottom of the partition plate, trapezoidal clamping grooves are formed in the bottoms of the first supporting plates, first rubber clamping strips are slidably arranged in the trapezoidal clamping grooves, and hollow plates are fixed to the ends, away from the trapezoidal clamping grooves, of the first rubber clamping strips; a second air outlet hole is formed in the end, away from the air inlet hole, of the partition plate, a silencing pipe is connected to the bottom of the first air outlet hole, and the end, away from the first air outlet hole, of the silencing pipe corresponds to the second air outlet hole; the problems that an existing compressor silencer is poor in sound absorption effect, complex in structure and not beneficial to assembly and maintenance are solved.

The utility model discloses a ventilation sound -absorbing device and energy storage heat management system belongs to the technical field of silencer, and is designed for solving the inconvenient of existing silencer dismounting, transportation etc. The utility model discloses a ventilation sound -absorbing device includes: frame, including the two end plates and two side plates for surrounding ventilation pipeline, and each end plate is detachably connected between two side plates, and sound -absorbing piece is located in ventilation pipeline and is detachably connected to the side plate, and sound -absorbing piece includes shell and the composite sound -absorbing inner core of setting in the shell, and the composite sound -absorbing inner core includes at least three layers of sound -absorbing layer of sequentially adhering settings, and the material density of outside sound -absorbing layer is lower than the material density of internal sound -absorbing layer. The utility model discloses a ventilation sound -absorbing device and energy storage heat management system, and the dismounting is convenient, and the transportation difficulty is low, and the composite sound -absorbing inner core can simultaneously absorb the noise of medium -high frequency and low frequency, solves the problem that the existing silencer can only handle medium -high frequency noise, and the noise reduction effect is good.

The utility model provides a sound insulation and noise reduction light wooden door, and relates to the technical field of light wooden doors, the sound insulation and noise reduction light wooden door comprises a door frame, a wooden door is hinged in the door frame, a noise reduction assembly is fixedly installed at the bottom of the wooden door, the noise reduction assembly comprises an installation frame, a sliding block is connected in the installation frame in a sliding mode, and limiting sliding grooves are formed in the two sides of the sliding block. A sealing strip is fixedly installed at the bottom of the sliding block, first racks are fixedly installed at the two ends of the sliding block, pressing tongues are arranged at the two ends of the sliding block and slidably connected with the mounting frame, gears are arranged between the pressing tongues and the sliding block and rotatably connected with the mounting frame, and second racks are arranged on one sides of the pressing tongues. The gear is connected with the first rack and the second rack in an engaged mode, and an abutting block is fixedly installed on the inner side of the bottom end of the door frame. According to the utility model, the sliding block can slide downwards when the door is closed, so that the sealing strip blocks the door slot, thereby improving the sound insulation and noise reduction effects, and having higher practical value.

The utility model relates to a resistance piece type pipeline silencer, which belongs to the technical field of pipeline silencers, and comprises a pipeline and a flange, the pipeline is internally provided with a dismounting mechanism, the dismounting mechanism comprises a mounting ring fixedly arranged on the inner circumferential wall of the pipeline, and the outer wall of the left side of the mounting ring is fixedly provided with an air guide seat; and an air guide pipe is fixedly mounted on the outer wall of the right side of the mounting ring. According to the resistance piece type pipeline silencer, gas is bound and guided through the gas guide seat and the mounting ring, the influence of water vapor on the glass wool felt is reduced through the effect of the gas guide plate, meanwhile, the interior of a pipeline can be effectively subjected to silencing treatment, the glass wool felt is conveniently mounted through the effect of the gas guide pipe, the fixing ring, the clamping seat and the sealing ring, and the practicability is high. The glass wool felt is convenient to disassemble and assemble, the sealing ring is convenient to mount through the action of the mounting seat, the fixing seat and the bolt, and the silencing effect on the pipeline is improved through the action of the rubber ring and the mounting rod.

The utility model relates to feed cooling fan technical field, and disclose a kind of silencing device for poultry feed cooling fan, the inside of load-bearing seat is provided with silencing mechanism, the top of silencing mechanism is provided with cooling fan body, the bottom of silencing mechanism is provided with damping mechanism, the silencing mechanism includes load-bearing plate, the inside of load-bearing seat is slidably connected, the bottom of load-bearing seat is fixedly connected with arc plate on two sides, the inside of arc plate is fixedly connected with linkage rod, the periphery of linkage rod is rotatably connected with rotating plate, the bottom of rotating plate inside is rotatably connected with connecting rod, the two sides of connecting rod are fixedly connected with U-shaped plate. Rotating plate rotates on linkage rod, and U-shaped plate and sliding block are slid on fixed rod by connecting rod, sliding block slides and compresses or stretches first spring, first spring absorbs and buffers vibration energy by deformation, reduce the noise generated in vibration transmission process.

The utility model relates to the technical field of connector accessories, in particular to a flange noise elimination connector which comprises a flange plate, a noise elimination inner pipe which is matched with an external pipeline in size and matched with the external pipeline in an inserted mode is installed in the center of the flange plate, and the noise elimination inner pipe is in threaded connection with the flange plate. By means of the silencing and sound insulation layer, the connector can effectively reduce noise generated when fluid flows in a pipeline, a good silencing effect is provided, by means of the anti-corrosion inner layer, the inner wall of the silencing inner pipe can effectively resist corrosive substances in the fluid, and the service life of the silencing inner pipe is prolonged. Meanwhile, the purity of fluid is guaranteed, possible secondary pollution is prevented, the silencing inner pipe and the flange plate are in threaded connection, mounting and dismounting become convenient and fast, the working efficiency is greatly improved, the sealing outer layer is arranged on the outer wall of the metal base material layer, the sealing performance of the flange silencing connector is enhanced, fluid leakage is effectively prevented, and the service life of the flange silencing connector is prolonged. And safe operation of a pipeline system is ensured.

The present application relates to internal combustion engine, specifically provide a kind of muffler for aviation internal combustion engine and aviation internal combustion engine, to solve the problem that the exhaust muffler of existing internal combustion engine is too large in size and too heavy in weight, not suitable for the needs of low-altitude aircraft.For this purpose, the muffler of the present application includes air inlet, air outlet and multiple layers of pleated partition, air inlet and air outlet form airflow passage, multiple layers of pleated partition are arranged in airflow passage in spaced-apart, each layer of pleated partition is configured to scatter, reflect, refract and diffract the sound waves of airflow, multiple layers of pleated partition are configured to continuously reflect and refract sound waves in multiple stages, so that sound waves collide with each other to cancel sound energy and reduce sound intensity, so that sound energy concentrated sound waves are scattered and attenuated step by step when passing through multiple layers of pleated partition, so that the muffler of the present application has obvious noise reduction effect, and the muffler of the present application is made of metal 3D printing, so that the effect of small size and light weight can be realized.

The invention discloses a sound-absorbing cotton producing and processing device, and relates to the technical field of sound-absorbing cotton production.The sound-absorbing cotton producing and processing device comprises a rack and further comprises a modeling assembly, a compounding assembly and an adjusting assembly, the modeling assembly comprises a first fixing shaft and a second fixing shaft which are fixed in the rack, and the outer wall of the first fixing shaft is rotationally connected with a first guide cylinder; and the composite assembly comprises a set of fixing rods fixed in the rack, the outer walls of the fixing rods are sleeved with composite parts, the outer walls of the composite parts are provided with a plurality of bosses in the circumferential direction and the axial direction, sliding holes penetrating through the bosses are formed in the composite parts, and the interiors of the sliding holes are each slidably connected with a dispensing part. When the movable part moves to the position farthest from the fixed rod, glue flows out through the through hole formed in the glue dispensing part and the gap between the communicating rods, pressing is completed while fixed-point quantitative glue spraying is conducted around the pressed concave cavity, sound absorption is conducted through the multiple closed cavities, and the sound absorption and silencing effects are enhanced.

The utility model discloses a waste gas treatment device of an air compressor, and relates to the technical field of air compressors. A cover body and an umbrella located on the upper side of the cover body are arranged at an opening in the upper side of the box body, two L-shaped plates are arranged at the bottom of the umbrella, L-shaped sliding ways are formed in the two sides of the box body, one end of each L-shaped plate is located in the corresponding L-shaped sliding way, a clamping block is arranged on one side of each L-shaped plate, and a clamping groove is formed in the other side of each L-shaped plate. The clamping block is clamped and matched with one side of the umbrella; and the two threaded rods are arranged on the box body, and the threaded rods are clamped and matched with one ends of the L-shaped plates. According to the utility model, through the arrangement of the L-shaped plate, one end of the L-shaped plate slides in and out of the L-shaped slide way under the action of a worker, so that the umbrella is more convenient to disassemble and assemble, the efficiency of cleaning impurities in the sound absorption holes is improved, and the effect of silencing waste gas in the box body is improved.

The utility model discloses a spliced pipeline elbow muffler, the muffler is installed to the outside of pipeline elbow, the muffler includes: along the first muffling piece and second muffling piece of pipeline elbow center symmetry plane symmetry installation, first muffling piece and second muffling piece form the muffler in the combination, first muffling piece includes the shell and sets up first sealing plate and second sealing plate at the both ends of shell, and the first sealing plate and second sealing plate form the sound attenuation chamber at the inboard of shell, and the sound attenuation chamber is movably connected with the sound attenuation assembly through the connecting component, and the sound attenuation chamber is used for filling sound attenuation material between the sound attenuation assembly and shell, the utility model provides detachable muffler, and first, second cover body is butt joint through the positioning column / groove, and the flange is fixed, and the installation is convenient, and the sound attenuation chamber fills the elastic material and cooperates the sound attenuation assembly of multilayer and promotes the sound attenuation effect, and the connecting component is hinged with the shell, and the elastic sound attenuation assembly can self -adaptation and is wrapped different diameter elbow, and the applicability is wide.

The utility model provides a kind of engine system and motorcycle, wherein, engine system includes: engine, the engine is set to the rear of motorcycle inclination, and the engine is provided with air inlet and air outlet;Silencer component is connected with the air outlet of the engine, and extend towards the tail of motorcycle after around the engine one week.This scheme effectively improves the compactness of structure by the reasonable layout of engine and silencer component, adjusts the gravity center of motorcycle by changing the inclination direction of engine.

This utility model discloses a silencing device for a vacuum pump, relating to the field of noise reduction equipment technology. It includes a first silencing unit and a second silencing unit connected to each other. Both the first and second silencing units have sound-absorbing layers, and each layer has a perforated plate on its outer side. The first silencing unit has a first air inlet and a first air outlet coaxially arranged, with the perforated plate connecting the two. The perforated plate contains an array of several silencing tubes extending axially along the first silencing unit. The second silencing unit has a second air inlet and a second air outlet perpendicularly arranged, with the perforated plate connecting them. The perforated plate contains at least one silencing plate. The cooperation of the first and second silencing units solves the problem of existing silencing devices having a simple structure and being unable to adapt to complex working conditions.