373results about How to "Improve the noise reduction effect" patented technology

The utility model provides a broadband silencer and an engine air inlet system. The broadband silencer comprises an air inlet pipe, an air outlet pipe, a silencer shell connected between the air inlet pipe and the air outlet pipe, and a resonance sound absorption structure arranged in the silencer shell. The resonance sound absorption structure is made of an elastic vibration material and is configured to be tubular; the resonance sound absorption structure is connected between the air inlet pipe and the air outlet pipe and forms an air inlet channel together with the air inlet pipe and the air outlet pipe. The inner diameter of the silencer shell is larger than the outer diameter of the resonance sound absorption structure, and a silencing cavity is formed between the silencer shell and the resonance sound absorption structure. According to the broadband silencer, elastic vibration of the resonance sound absorption structure enables the silencing cavity to form a resonance cavity, energy of noise is converted into vibration kinetic energy, and therefore the silencing performance of the broadband silencer can be improved.

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 discloses a silencer, noise reduction gas circuit device and massage armchair, the silencer comprises an expansion pipe and a corrugated pipe, the expansion pipe is internally provided with an expansion cavity, the corrugated pipe is arranged in the expansion cavity in a penetrating manner, the corrugated pipe is provided with a plurality of first chambers and a plurality of second chambers, the first chambers are distributed at intervals along the extension track of the corrugated pipe, and the second chambers are distributed at intervals along the extension track of the corrugated pipe. Each second chamber is arranged between every two adjacent first chambers, and the radial sectional area of each first chamber is larger than that of each second chamber; a through hole is formed in the circumferential outer wall of each first cavity, a third cavity is defined by the outer wall of the corrugated pipe and the inner wall of the expansion cavity, the first cavities and the third cavity are communicated through the through holes, a Helmholtz resonant cavity is jointly formed by the first cavities, the second cavities and the third cavity, and the cross sectional area of the transmission channel is discontinuous, so that the transmission efficiency is improved. The sound waves transmitted in the pipeline form different transmission speeds, densities and directions, so that impedance mismatch is generated, downstream transmission of sound wave energy is hindered, and the silencing capacity is good.

The invention discloses a fan silencer with a compressed air blowing function, and belongs to the technical field of silencers, the fan silencer comprises an outer shell, a partition plate is arranged in the outer shell, an inner shell is arranged on the right side of the partition plate, inner silencing cotton is arranged on the inner wall of the inner shell, an inner cavity is formed in the inner shell, an exhaust pipe is arranged on the outer side of the inner shell, the exhaust pipe is communicated with the inner shell, and the inner silencing cotton is arranged on the inner wall of the inner shell. A groove is formed in the exhaust pipe, the pushing mechanism and the groove are sealed when the pushing mechanism moves, a plurality of elastic mechanisms penetrate through the air inlet pipe in the circumferential direction, one end of the pushing mechanism penetrates through the elastic mechanisms, a plurality of splice plates which form sealing with the inner shell are movably arranged on the inner shell, and one ends of the elastic mechanisms are connected with the splice plates. According to the fan silencer, automatic adjustment can be achieved according to different flow speeds of airflow entering different cavities in the fan silencer, manual operation is not needed, the airflow entering the fan silencer is adjusted in real time to enter the different cavities according to changes of the airflow entering the fan silencer, operation is convenient, and the silencing effect is better.

The invention discloses an oil-gas separation noise reduction assembly and a working method thereof and a compressor, the oil-gas separation noise reduction assembly comprises a cylinder seat exhaust structure and a valve body structure, and the cylinder seat exhaust structure is provided with a vent hole, a first noise reduction cavity, a second noise reduction cavity and an oil collecting and discharging structure; the vent hole is communicated with the first silencing cavity, and the second silencing cavity is communicated with the first silencing cavity; the oil collecting and discharging structure communicates with the first silencing cavity and the second silencing cavity. The first noise reduction cavity and the second noise reduction cavity are each internally provided with an oil blocking structure, and the valve body structure is connected with the oil collecting and discharging structure. By means of the oil-gas separation silencing assembly, the silencing effect of the compressor can be improved, the discharge amount of lubricating oil is reduced, and the efficient performance of a refrigerating system is ensured.

The utility model belongs to the technical field of noise reduction barriers, and particularly relates to a sound barrier with a multistage noise reduction structure, which comprises a sound barrier plate, a noise reduction device is arranged in the sound barrier plate, and a splicing device is arranged on the right side of the sound barrier plate. According to the sound barrier with the multi-stage noise reduction structure, noise waves are absorbed and converted into kinetic energy through the noise reduction springs, noise is reduced, noise is further absorbed through noise reduction cotton on the inner wall of the noise reduction pipe, and the noise reduction effect is improved; meanwhile, an extension spring is compressed, then a splicing block on the other sound barrier plate is inserted into a splicing groove in the right side of the first sound barrier plate, then an insertion rod is loosened, the extension spring is reset under the self-elasticity effect, and therefore the insertion rod is pulled to be inserted into an insertion hole in the splicing block, and installation of the two sound barrier plates is completed rapidly; and the installation efficiency is improved.

The high-position air inlet channel comprises an air inlet channel shell, an air inlet and an air outlet are formed in the air inlet channel shell, the air inlet and the air outlet are communicated to form an airflow channel, and the air inlet and the air outlet face different directions; the channel structure comprises a first-section channel close to the air inlet and a rear-section channel close to the air outlet, the air inlet is formed in one end of the first-section channel, the other end of the first-section channel is communicated with one end of the rear-section channel, the air outlet is formed in the other end of the rear-section channel, and the first-section channel is divided into a plurality of side-by-side channels in the airflow circulation direction; wherein the plurality of channels are suitable for generating reflected sound waves to counteract sound waves transmitted from the rear-section channel to the first-section channel. By the adoption of the high-position air inlet channel, the silencing function of the air inlet of the high-position air inlet channel can be achieved, weight cost increase caused by an external connection structure can be reduced, and the high-position air inlet channel is more attractive.

The invention relates to the technical field of visual image detection based on deep learning, and particularly discloses a conveyor belt deviation detection method and an improved yolov5 network model, and the model comprises carrier roller detection processing and belt area segmentation processing; the method comprises establishing a model; training data by using an improved yolov5 network model; when the conveyor belt is subjected to deviation detection, a camera acquires a detection image, and the called improved yolov5 network model is processed and input; the area of the carrier roller is calculated through carrier roller detection processing, and whether the area exceeds a set threshold value or not is judged; carrying out belt region segmentation processing for edge extraction, and judging whether a detection straight line deviates from a threshold value of a set straight line or not through Hough straight line detection; when the two judgment results are both yes, deviation is judged, and an alarm is given; and when one or two judgment results are negative, the steps are performed again. The method is a novel method for detecting belt deviation based on deep learning, and a more accurate detection result can be obtained.

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 relates to the technical field of refrigeration and storage, in particular to a silencer and a refrigerating and freezing device. The silencing device comprises a silencing body, heat dissipation through holes horizontally penetrating through the two opposite side walls are formed in the silencing body, and sound absorption holes are formed in the hole walls of the heat dissipation through holes. Noise elimination cavities which are formed around the heat dissipation through holes and communicate with the sound absorption holes are further formed in the noise elimination body, at least one noise elimination cavity is provided with a bent position, and the bent position is of a first arc-shaped structure. When airflow enters the silencing cavity, the risk that the airflow generates secondary noise at the bending position of the silencing cavity can be reduced. According to the utility model, the impedance matching problem can be essentially improved, so that the silencer not only has a wide negative refractive index frequency band, but also can be well matched with air impedance. According to the refrigerator, the problem that in the prior art, a silencer is poor in noise reduction effect on the compressor bin is solved, the sound quality of the refrigerator is improved, and therefore the purpose of improving user experience is achieved.

The utility model relates to the technical field of silencer devices, in particular to an efficient fan silencer, which comprises a fan silencer main body, a silencing core part of the fan silencer main body is as follows: a common limit type resistance-limiting composite wide interesting belt silencing body is arranged in the fan silencer main body and is formed by compounding a resonator and a resistive sound absorption ring made of resistive sound absorption materials, the cavity depth is 15cm, the agricultural thickness is 25mm, and the inner side of the fan silencer main body is provided with a plurality of through holes; the sound absorption coefficients of resonators with the punching rates of 06%, 1%, 12% and 2% within the frequency range of 125-400 HZ are all larger than 07, the resonance silencing body is matched with a glass wool integrated body (the density is 2 skgm, and the surface glass is combined with a steel plate net), so that the sound absorption coefficient of the resonance silencing body within the broadband range of 125-8000 Hz reaches up to more than 07, and the sound absorption coefficient of the resonance silencing body within the broadband range of 125-8000 Hz reaches up to more than 07. Meanwhile, the silencer made of a plurality of common-limit type limited-resistance composite wide interesting belt silencing body structures is adopted, and a good silencing effect can be obtained within a wide frequency range by selecting the combination of different plate thicknesses, perforation L diameters, different cavity depths behind the silencing perforated plates and the like.

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 field of propellers or rotors for airplanes, in particular to a bionic curved zigzag ducted rotor based on owl wings. A bionic curved zigzag ducted rotor wing based on an owl wing comprises a ducted body (1), a support (2) and a rotating shaft (3), the outer end of the support (2) is fixed on the inner side wall of the ducted body (1), the rotating shaft (3) is rotatably arranged at the center of the support (2), the bionic curved zigzag ducted rotor wing is characterized by further comprising at least two rotor wings (4), the rear ends of the rotor wings (4) are fixed on the rotating shaft (3), and the rotor wings (4) are evenly distributed around the rotating shaft (3). Namely, the connecting lines of the outer end points of all the rotor wings (4) form a line segment or a regular polygon with the rotating shaft (3) as the center, gaps are reserved between the front ends of the rotor wings (4) and the inner side wall of the duct body (1), and sawteeth (41) are arranged on the rear edges of the rotor wings (4). The pneumatic performance is excellent, and noise is reduced.

The invention relates to the field of portable heat dissipation, in particular to a neck-hanging fan which comprises a fan, a ventilation channel, a first air inlet and a first air outlet, the first air inlet and the first air outlet are communicated with the ventilation channel, and the fan is arranged in the ventilation channel. The fan runs, air flow penetrating through the ventilation channel is formed between the first air inlet and the first air outlet, and the direction of the rotating center axis of the fan is consistent with the direction of the air flow; at least two silencing devices are arranged in the ventilation channel, at least one silencing device is arranged between the first air inlet and the draught fan, and at least the other silencing device is arranged between the draught fan and the first air outlet. The neck-hanging fan can achieve the effects of high wind speed and low noise, and can effectively reduce the influence of high-frequency noise on a user so as to improve the user experience.

The invention relates to the technical field of rims, and discloses a precise pre-tightening force control structure for heavy rim locking, which comprises a rim, a spoke fixedly connected to the inner wall of the rim, a hub fixedly connected to one end of the spoke and a connecting assembly arranged on one side of the rim, and the connecting assembly comprises a control mechanism arranged on the inner side of the rim. A silencing mechanism is arranged on the outer side of the rim, the positioning strips and the positioning grooves are arranged in a clamped mode, the rectangular columns are slidably connected to the inner walls of the rectangular grooves and the outer walls of the limiting columns, the ends, away from the rotating rods, of the first springs are fixedly connected with the connecting blocks, and the clamping rods and the clamping grooves are arranged in a clamped mode. The problems that in the prior art, when a rim and a wheel shaft are locked through bolts, threads are possibly damaged due to too large pre-tightening force, looseness cannot be effectively prevented due to too small pre-tightening force, and the locking effect between the rim and the wheel shaft is affected are solved.

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.

The utility model relates to a combined splash-proof device of a high-level water-collecting mechanical draft cooling tower, which comprises a water-collecting tank and a water-collecting inclined plate, the water-collecting inclined plate is obliquely arranged, the water-collecting tank is arranged below the lower end of the water-collecting inclined plate, the included angle between the water-collecting inclined plate and the horizontal plane is 45-55 degrees, a splash-proof filler is further arranged on the water-collecting inclined plate, and the splash-proof filler is arranged on the lower end of the water-collecting inclined plate. The splash-proof filler is obliquely and upwards placed on the upper surface of the water collecting inclined plate from the lower end of the water collecting inclined plate, one end of the splash-proof filler is aligned to the lower end of the water collecting inclined plate, and the length H2 of the splash-proof filler is two thirds of the length H1 of the water collecting inclined plate in the inclination direction from the lower end to the high end of the water collecting inclined plate. The utility model mainly aims to provide the combined type splash-proof device of the high-level water collecting mechanical ventilation cooling tower, which has the functions of silencing and reducing noise, and is remarkable in splash-proof effect and good in economical efficiency.

The invention discloses a silencing device for an outlet of a fire-fighting smoke exhaust fan. The silencing device comprises a mounting cylinder and a plurality of components assembled in the mounting cylinder, wherein the components comprise a smoke dust cleaning component, a heat exchange silencing component, a smoke dust collecting tank, an adsorption component and a smoke dust discharging component. The smoke cleaning assembly is located at the top of the mounting cylinder, the heat exchange silencing assembly and the smoke collecting tank are connected to the bottom of the mounting cylinder, the adsorption assembly is connected to the bottom of the heat exchange silencing assembly, and the smoke discharging assembly is connected to the bottom of the smoke collecting tank and located on the inner side of the adsorption assembly. The device forms a closed cold air through cavity, and a smoke outlet is formed in the bottom, so that effective smoke emission is ensured. In addition, the device further comprises a stirring assembly, a conveying assembly and a driving assembly which are connected with the adsorption assembly and the smoke dust discharging assembly respectively. Not only is the silencing effect remarkably improved, but also the functions of smoke cooling, dust removal and toxic and harmful substance treatment are integrated, many problems in the prior art are effectively solved, and a safe, environment-friendly and efficient smoke exhaust silencing device is provided for the field of fire protection and smoke exhaust.

The utility model discloses a pressure regulating sleeve which comprises a sleeve section and a pressing step on the end portion of the sleeve section, the sleeve section is provided with a pressure regulating hole and at least one step ring, and the step ring is provided with a chip removal channel. According to the design, the gap between the silencing outer sleeve and the pressure regulating sleeve of the silencer can be divided into a plurality of chambers through the step rings, the silencing effect is effectively improved, and noise transmission is reduced. And meanwhile, a deslagging channel is optimized, residues are prevented from directly entering the nail fixer main body, the problems of corrosion and jamming of key parts are reduced, the structural stability is enhanced, the equipment reliability is improved, and the service life of the equipment is prolonged. The problems that an existing pressure regulating sleeve is poor in noise reduction effect, and residues damage parts of a nail fixing device are effectively solved.

The oxygenerator comprises a compressor cover, the interior of the compressor cover is a compressor installation space, a nitrogen discharge bin is arranged on the compressor cover, a nitrogen discharge pipe is arranged on the nitrogen discharge bin, the nitrogen discharge pipe is communicated with an inner cavity of the nitrogen discharge bin, and the inner cavity of the nitrogen discharge bin is provided with a water inlet and a water outlet. A plurality of through holes are formed in the side wall of the nitrogen discharging bin, and an inner cavity of the nitrogen discharging bin communicates with the compressor installation space through the through holes. The nitrogen removal bin is simple in structure and good in noise elimination effect; the device can be suitable for various complex working conditions such as high temperature, moisture and high-speed airflow, and is good in applicability.

The high-vibration-resistance noise reduction heat exchanger integrated assembly comprises a first-stage noise reduction module, a second-stage noise reduction module and a third-stage noise reduction module, the first-stage noise reduction module comprises a columnar noise reduction shell, noise reduction holes are formed in the inner wall of the noise reduction shell, an interlayer is arranged in the noise reduction shell to serve as a noise reduction cavity, the noise reduction holes communicate with the noise reduction cavity, and the second-stage noise reduction module comprises a second-stage noise reduction module and a third-stage noise reduction module; the second-stage noise reduction module comprises a connecting cover, a sonic sensor, a central processing unit and a reverse sonic generator, the third-stage noise reduction module comprises a noise reduction opening, the noise reduction opening and a connecting cavity are integrally formed, the noise reduction opening is aligned to an air outlet in the top of the heat exchange body, and the first-stage noise reduction module can reduce noise generated by friction of flowing water and air; the secondary noise reduction module can perform active noise reduction on mechanical noise of the motor and the fan, the tertiary noise reduction module performs noise reduction on the air outlet, through the tertiary noise reduction mechanism, noise reduction treatment is performed on friction noise of air and internal mechanical noise by adopting different means, the noise reduction effect is good, and excessive space cannot be occupied.

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 cooling tower air duct with a noise reduction and flow guide structure, which comprises a mounting seat, a plurality of mounting holes are equidistantly formed in the edge of the top of the mounting seat in a surrounding manner, the top of the mounting seat is fixedly communicated with an air duct body, and a plurality of flow guide plates are fixedly connected onto the inner wall of the air duct body. A first silencing assembly is arranged on the inner wall of the air duct body. The mounting seat, the mounting hole, the air duct body, the guide plate, the first silencing assembly, the first silencing layer, the first sound insulation felt layer, the glass wool layer, the second sound insulation felt layer, the first silencing plate, the first silencing groove, the second silencing assembly, the silencing cover, the second silencing layer, the second silencing plate and the second silencing groove are matched with one another, so that a good silencing effect is achieved; and therefore, the practicability of the cooling tower air duct is greatly improved, and the market demand can be greatly met.

The utility model discloses a decorative plate not prone to deformation, and belongs to the technical field of decorative plates. Aiming at the problem that the existing decorative plate cannot absorb noise and impact, the utility model provides the following technical scheme that the decorative plate comprises a wood plate and a reinforcing layer, and the reinforcing layer is arranged in the wood plate; the bottom of the wooden board is connected with a silencing layer, and the bottom of the silencing layer is connected with a cushioning layer. The sound attenuation layer and the shock absorption layer are installed on the wooden board, the sound attenuation layer is connected to the bottom of the wooden board and is made of flexible rubber materials, when noise in the external environment is conducted into the decorative board, the sound attenuation effect of the decorative board is improved through the air guide holes in the outer surface of the sound attenuation layer, and the shock absorption layer is made of silica gel materials. When the impact force in the external environment is conducted to the interior of the decorative plate, the decorative plate further absorbs the impact force, and then the stability of the decorative plate is improved.

The utility model relates to the technical field of silencers, and discloses a novel silencing material stainless steel silencer which comprises a silencer shell and a silencing assembly, and the silencing assembly is arranged in the silencer shell. The novel silencing material stainless steel silencer has excellent corrosion resistance and structural strength through the silencer shell made of the stainless steel material, it is ensured that the silencer can still work stably in a severe environment, meanwhile, the stainless steel material can also play a silencing role, and the silencing effect is good. The reinforcing blocks are connected with the widened position of the bottom of the silencer shell through the screws, the overall structural stability of the silencer is effectively enhanced, deformation or damage caused by vibration or external force is prevented, meanwhile, the composite plant fiber pipes have good sound absorption performance, noise transmitted into the silencer can be effectively absorbed and reduced, and the noise reduction effect is good. And in cooperation with the glass wool filled in the noise reduction reinforcing block, the noise reduction effect is further enhanced, and noise is attenuated on multiple levels.

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 utility model discloses a special silencer for an adsorption type drying machine, and relates to the related technical field of the adsorption type drying machine. The device comprises an exhaust jacket, a bottom end cover, a top end cover and a gas delivery pipe, an installation disc is fixed to the lower portion of the inner wall of the exhaust jacket, the gas delivery pipe is fixed to the center of the top end of the installation disc, spiral blades are fixed to the peripheral side of the gas delivery pipe, the top end cover is fixed to the upper portion of the peripheral side of the gas delivery pipe, and the bottom end cover is fixed to the lower portion of the peripheral side of the exhaust jacket. The top end of the bottom end cover is flush with the top end of the mounting disc. By arranging the exhaust jacket, the bottom end cover, the top end cover and the gas conveying pipe, the problems that the special silencer for the adsorption type drying machine is insufficient in gas-water separation and poor in silencing effect are solved, and the special silencer for the adsorption type drying machine has the advantages that the special silencer for the adsorption type drying machine is more sufficient in gas-water separation and better in silencing effect.

The utility model discloses a silencer which comprises a body, the body is provided with a cavity, the two ends of the cavity are provided with a first communicating nozzle and a second communicating nozzle which are communicated with each other, and the first communicating nozzle and the second communicating nozzle are arranged in a staggered mode. A first inclined partition plate and a second inclined partition plate are arranged in the cavity, the first partition plate is provided with a first communicating groove, the second partition plate is provided with a second communicating groove, and the first communicating groove and the second communicating groove are vertically staggered; the first partition plate and the second partition plate divide the cavity into a first cavity, a second cavity and a third cavity, the first cavity is communicated with the first communication nozzle, the second cavity is located between the first cavity and the third cavity and communicated with the first cavity and the third cavity, and the third cavity is communicated with the second communication nozzle. The propagation path of sound waves in the silencer body is prolonged, the reflection frequency of the sound waves is increased, and finally a better silencing effect is achieved.

The present invention relates to the field of air compressors, and in particular to a portable air compressor, comprising a motor and a chassis arranged at the output end of the motor, a head assembly for compressing air arranged on the chassis, a pressure stabilizing tank arranged on the chassis, the pressure stabilizing tank and the motor arranged on opposite sides of the chassis, and the outer dimensions of the pressure stabilizing tank do not exceed the chassis; the pressure stabilizing tank comprises a side wall and an end cover arranged at the end of the side wall, a cavity is formed between the side wall and the end cover, and the other end of the side wall is sealed and connected to the chassis, so that the cavity becomes an air storage chamber; a mounting portion is arranged on the side wall, and a gas transmission channel connected to the air storage chamber is arranged in the mounting portion, and the input end of the gas transmission channel is connected to the high-pressure end in the head assembly. The present invention is provided with a pressure stabilizing tank at one end of the air compressor, and the outer dimensions of the pressure stabilizing tank do not exceed the chassis, so that it is easy to carry.