293 results about "Noise polution" patented technology

The utility model relates to the field of power transformation engineering sound barriers, in particular to a power transformation engineering movable noise reduction barrier capable of being patrolled externally, which comprises a plurality of steel columns, a steel bottom beam positioned at the lower sections of the steel columns and a steel top beam positioned at the upper sections of the steel columns, and the plurality of steel columns, the steel bottom beam and the steel top beam form a sound barrier frame. A sound barrier plate is arranged between every two adjacent steel columns, and the sound barrier frame and the sound barrier plates form a noise reduction barrier. The sound barrier construction period of the transformer substation and the converter station is shortened. According to the utility model, on-site material, machine tool and personnel investment is reduced, construction waste emission is reduced, noise pollution is reduced, and carbon emission is reduced. Daily patrol of operators is facilitated, the device can be quickly moved when the device needs to be carried during maintenance, a channel is reserved for carrying the device, the power failure time is effectively saved, and the working efficiency is improved. The technical problems that the construction period is long, resources are wasted, pollution is serious, and replacement and carrying are inconvenient can be solved.

The utility model discloses an air source heat pump unit with noise reduction and sound insulation, which relates to the technical field of air source heat pump units and comprises a front cover component and an air source heat pump body, the air source heat pump body is mounted in the front cover component, one side of the front cover component is connected with a movable plate, and a base component is mounted at the bottom of the front cover component. The back side of the front cover assembly is connected with a back plate assembly, and wall hanging pieces are symmetrically installed on the side, away from the front cover assembly, of the back plate assembly up and down. According to the air source heat pump unit with the noise reduction and sound insulation functions, the noise reduction pad and the damping plate are arranged on the inner wall of the front cover body, meanwhile, the noise reduction net rack is installed on the surface of one side of the back plate main body, and the movable plate is matched for combined use, so that the noise reduction and sound insulation functions can be provided for operation of the air source heat pump main body as much as possible, and noise pollution caused by device operation is reduced; in addition, through the use of the base assembly and the wall hanging piece, the whole device can be selectively fixed to the wall or the ground according to use requirements.

The utility model relates to the technical field of improving the mute effect of an automobile tire, and discloses a mute structure for improving the mute effect of the automobile tire, mute cotton formed by a polyurethane matrix is embedded in the inner wall of the tire, the matrix is provided with micropores, and reinforced fibers are respectively arranged in the transverse direction and the longitudinal direction of the matrix. And the polyurethane matrix is bonded with the inner wall of the tire through a glue layer. The silence cotton can effectively absorb and disperse vibration and noise generated in the running process of the tire through the combination of the micropore structure and the reinforced fibers. In addition, the use of the polyurethane matrix ensures that the mute cotton has good elasticity and durability, so that the mute effect of the mute cotton is kept in long-term use. According to the utility model, not only is the comfort of the automobile improved, but also the noise pollution to the environment is reduced. By adopting the organic silicon sealing glue as the bonding layer, the tight combination of the mute cotton and the inner wall of the tire is ensured, the abnormal sound possibly generated in the driving process is avoided, and the high practical value and the market application prospect are achieved.

The utility model relates to the technical field of environmental protection engineering, construction engineering waste treatment and resource recovery, and discloses an environment-friendly concrete waste recovery device which comprises a base, a crushing box is fixedly arranged at the top of the base through a fixing frame, a conveying belt is rotationally arranged on one side of the crushing box, and the other end of the conveying belt is rotationally arranged on one side of a screening box. According to the environment-friendly concrete waste recycling device, the crushing box, the screening box, the dust removal box and the sound insulation plate are arranged, aggregate crushed through the crushing box enters the screening box to be screened, the aggregate of different sizes is collected, dust generated in the screening process is removed through the dust removal box, and the dust removal effect is good. And meanwhile, noise generated in the recycling process can be reduced to a certain degree by a sound insulation plate, and the effects that dust generated in the treatment process can be effectively reduced, aggregate of different sizes can be screened and recycled respectively, and noise pollution generated in the recycling process can be effectively reduced are achieved.

The invention relates to the field of liquid level meters, and discloses an anti-explosion low-temperature liquid level meter which comprises a liquid level meter pipe, a flange plate and a transparent protection plate, the flange plate is arranged at one end of the liquid level meter pipe, the transparent protection plate is installed at a dial on the liquid level meter pipe, and a moving structure is arranged on the right side face of the liquid level meter pipe. The anti-frosting structure is arranged at the other end of the liquid level meter pipe, under the action of the anti-frosting structure, the moving structure and the cleaning structure, purging and wiping work of the transparent protection plate can be achieved, in cooperation with the transmission structure, the moving wiping work of wiping cotton of the purging and cleaning structure can be achieved only under the action of the same electric telescopic rod, and the wiping efficiency is improved. Not only is the working energy consumption lower, but also the noise pollution is reduced; and by arranging the driving structure, when the wiping cotton moves back and forth in the length direction of the liquid level meter pipe, the wiping cotton is driven to move back and forth in the width direction of the liquid level meter pipe, and the wiping effect on the transparent protection plate is improved.

The utility model relates to the technical field of drainage pipe fittings, in particular to a waterproof hammer drainage pipe fitting which comprises an inner pipe and an outer pipe, one end of the inner pipe is a closed end, and a water outlet is formed in the side wall of the inner pipe; the outer pipe is arranged outside the inner pipe in a sleeving manner and is connected with the inner pipe; and the water outlet is communicated with the outer pipe. The closed end is arranged to bear the impact of water flow, after the flow speed of the water flow is reduced, the water flow is guided through the water outlet and the appearance inner wall, the water flow speed is further reduced, and therefore pipeline vibration and noise pollution are avoided.

The invention discloses a noise reduction type disrotatory fog gun, and relates to the technical field of environmental protection. The noise reduction type contra-rotating fog gun comprises an air guide barrel, a first sound absorption barrel, a contra-rotating air outlet device and a spraying device. The first sound absorption cylinder is arranged in the air guide cylinder, a first sound absorption cavity is formed between the first sound absorption cylinder and the air guide cylinder, a plurality of first sound absorption holes are densely formed in the first sound absorption cylinder, the first sound absorption holes communicate with the first sound absorption cavity, the contra-rotating air outlet device is installed in the first sound absorption cylinder, and the spraying device is installed at the air outlet end of the air guide cylinder; the contra-rotating air outlet device comprises a driving part, a first impeller, a reverse transmission assembly and a second impeller, the driving part is connected with the first impeller, the reverse transmission assembly is connected between the first impeller and the second impeller, and the first impeller and the second impeller are coaxially arranged. According to the noise reduction type disrotatory fog gun, long-distance water mist blowing can be achieved, the operation requirements of different scenes are met, noise can be effectively reduced, and noise pollution is relieved.

The utility model provides a kind of sound insulation and noise reduction composite air pipe structure, it is related to composite air pipe technical field, including composite air pipe assembly, sound insulation component is provided on the composite air pipe assembly, the side of the composite air pipe assembly is provided with mounting assembly, the composite air pipe assembly includes air pipe main body and protective support cover.The utility model is by sound absorption box and is set in the inside of air pipe main body, cooperate sound absorption hole is favorable to absorb part noise, in turn is favorable to weaken part noise, by sound insulation board and is set in the outside of air pipe main body, it is favorable to further weaken noise, reduce its diffusion to outside, by both part is favorable to realize sound insulation and noise reduction, reduce noise transmission to external environment, in turn reduce noise pollution, by the outside of protective support cover is provided with buffer pad, it is favorable to absorb part vibration when air pipe main body operates, reduce vibration diffusion to building structure by support.

The utility model relates to the technical field of magnetic core processing, in particular to a material pushing mechanism for magnetic core processing. The magnetic core machining pushing mechanism comprises a base, a connecting frame, a conveying belt, fixing plates, guide rods, springs, a pushing plate and the like, the connecting frame is slidably connected into the base, the fixing plates distributed front and back are fixedly connected to the top of the connecting frame, the conveying belt is rotatably connected to the outer portion of the connecting frame, and the pushing plate is slidably placed between the two fixing plates. The right side of the push plate is fixedly connected with symmetrically-distributed guide rods, the fixing plate is in sliding connection with the transversely-aligned guide rods, the guide rods are sleeved with springs used for assisting resetting, and the two ends of the springs are connected with the fixing plate and the guide rods respectively. The conveying belt is arranged to place the magnetic core, the magnetic core is pushed into the positioning mechanism of the machining equipment, the magnetic core can be prevented from being directly contacted with the base to be abraded, the integrity of the surface of the magnetic core is protected, noise can be prevented, and noise pollution in the working environment is reduced.

The utility model relates to the technical field of lubricating oil pumps, and discloses a lubricating oil pump for a gearbox, which comprises a shell, the top end of the shell is connected with a top cover through a magnetic component, the inner wall of the shell is fixedly connected with a sound insulation pad, the inner wall of the shell is fixedly connected with a pump body, and the left end of the pump body is provided with a driving shaft. A first oil inlet pipe is fixedly connected to the right end of the pump body, a first fixing ring is fixedly connected to the outer wall of the first oil inlet pipe, a second fixing ring is arranged at the right end of the first fixing ring, a second oil inlet pipe is fixedly connected to the inner wall of the second fixing ring, and first clamping rings are arranged on the outer walls of the first fixing ring and the second fixing ring. According to the lubricating oil pump, when the filter plate needs to be maintained and replaced, operation is easy and convenient, complex tools and professional skills are not needed, the maintenance time and cost can be saved, the maintenance efficiency of equipment is improved, the sound insulation pad is arranged on the inner wall of the shell, noise generated when the pump body operates is effectively absorbed, and noise pollution generated when the lubricating oil pump works is reduced.

The invention relates to an intelligent AGV (automatic guided vehicle) system for processing an assembled steel structure, belongs to the technical field of AGV guide vehicles, and aims to solve the problems that the steel structure is damaged, workers are injured, surrounding substances are smashed and noise is caused as the steel structure is inclined and falls off when the steel structure is transported to turn, the intelligent AGV system comprises an I-shaped track, an AGV guide vehicle, a control module and a sensing module, a limiting assembly is installed on the AGV guide vehicle, a steel structure containing table is fixedly connected to the AGV guide vehicle, a first dragging and lifting assembly is installed on the steel structure containing table, a second dragging and lifting assembly is installed on the steel structure containing table, and a bearing assembly is installed on the AGV guide vehicle. Inclination and damage of the AGV body caused by falling of the steel structure are effectively prevented, noise pollution possibly caused by falling of the steel structure is effectively reduced, the probability of occurrence of serious safety accidents such as crushing of workers and smashing of surrounding objects is effectively reduced, and safety guarantee is provided for field personnel and equipment.

The utility model provides a vibration grinding and polishing device, and relates to the technical field of polishing equipment, the vibration grinding and polishing device comprises a soundproof box provided with a box cover, a grinding and polishing box with a top opening is arranged in the soundproof box, the grinding and polishing box is fixed in the soundproof box through a plurality of vibration springs, and a vibration motor is arranged at the bottom of the grinding and polishing box; compared with the prior art, due to the fact that the sound insulation box is provided with the box cover, and the sound absorption cotton is arranged on the inner wall of the sound insulation box, the inner wall of the box cover and the outer wall of the grinding and polishing box, when the device runs, noise generated in the device is difficult to diffuse outwards directly, and the grinding and polishing efficiency is improved. Noise pollution to surrounding environments such as workshops and the like is greatly reduced, a relatively quiet working atmosphere is created for operators and surrounding areas, and hearing health of the operators is protected.

The utility model discloses a cork and hardwood structure type frame floor which comprises an outer frame layer, a floor surface layer is arranged at the top end in the outer frame layer, an upper sound insulation layer is arranged at the bottom end of the floor surface layer, the outer wall of the upper sound insulation layer is fixedly connected with the inner wall of the outer frame layer, and longitudinal reinforcing strips are arranged at the bottom end of the upper sound insulation layer at equal intervals. The outer walls of the two sides of the longitudinal reinforcing strips are fixedly connected with the inner wall of the outer frame layer, a lower sound insulation layer is arranged at the bottom ends of the longitudinal reinforcing strips, the outer wall of the lower sound insulation layer is fixedly connected with the inner wall of the outer frame layer, and a floor bottom layer is arranged at the bottom end of the lower sound insulation layer. The floor has excellent sound insulation, shock absorption and heat preservation performance, high strength and abrasion resistance of the floor are guaranteed, the overall structural strength of the floor is improved, the service life of the floor is prolonged, the sound insulation performance of the floor is improved, the indoor noise pollution phenomenon of a building is reduced, and the application range of the floor is widened.

The invention discloses a double-layer learner integrated model for predicting the porosity of mixed shale, and relates to the technical field of mixed shale porosity evaluation. According to the technical scheme, the method comprises the following steps that S1, logging data with high correlation with the actually-measured porosity are selected; s2, constructing an optimal learning device; and S3, constructing a double-layer learner integration model. According to the method, the logging data with high correlation with the porosity are preferably selected through a principal component analysis method, so that noise pollution caused by input of a large amount of logging data is avoided; the optimal hyper-parameter value of the machine learning model is searched by using a particle swarm optimization (PSO) algorithm, so that the learning ability of a base learner is improved to the greatest extent; the base learner is used as the first layer learner of the integrated model, and the meta learner of the second layer is combined, so that the integrated model of the double-layer learner is constructed, the purposes of improving the model prediction precision and evaluating the vertical heterogeneity of the pores of the mixed shale reservoir are achieved, and the purpose of guiding unconventional oil-gas exploration and development of the mixed shale is achieved.

The invention relates to the related field of a wireless communication technology, in particular to a directional sound propagation method for an interphone loudspeaker, which realizes directional sound propagation, reduces noise pollution, has stronger confidentiality due to the fact that sound cannot be diffused all around, and realizes directional sound propagation of the interphone loudspeaker through an ultrasonic carrier modulation technology. According to the invention, sound directional propagation is realized on the basis of original hardware of a common interphone, the whole machine does not need to be reconstructed, the limitation that a traditional directional loudspeaker needs special hardware is broken through, the technical path is novel, and the realization cost of a directional propagation function is greatly reduced; and large-scale popularization and application of common interphones are facilitated.

The utility model relates to the technical field of noise pollution prevention and control, in particular to a sound insulation screen for preventing and controlling noise pollution, which comprises a sound insulation mechanism for preventing and controlling noise pollution, and a fixing mechanism for fixing rotating equipment is arranged above the sound insulation mechanism. By arranging the sound insulation mechanism and the fixing mechanism, when a certain sound insulation plate is damaged and needs to be disassembled, a knob is rotated, the knob drives a bidirectional threaded rod to rotate, the bidirectional threaded rod rotates to drive two movable blocks to get away from each other, the movable blocks drive movable rods to move, and the left movable rod and the right movable rod also get away from each other; the movable rods move to be separated from the limiting assemblies, then the inserting rods are detached from the limiting assemblies, limiting of the sound insulation plates is relieved through the limiting assemblies, finally, the damaged sound insulation plates are detached, all the sound insulation plates in the device can be detached independently, the detaching process is convenient and rapid, and the using effect of the device is effectively improved.

The utility model relates to the technical field of metal product processing waste treatment, in particular to a metal product processing waste collecting device with a protective structure, which comprises a bottom plate. A protective shell, a sound insulation door, a repair door, a mounting part, a sound absorption plate and a pressing plate are further included, the protective shell is fixedly arranged on the upper end face of the bottom plate, sound insulation cotton is filled in the protective shell, and a top plate is fixedly arranged on the upper end face of the protective shell; the sound insulation cotton is filled in the protective shell and used for absorbing noise generated during operation of equipment and reducing influences on the external environment, the sound insulation door has a sound insulation effect and brings convenience to material taking and feeding work of operators, the repair door brings convenience to replacement of the sound absorption plate by workers, the repair door also has a sound insulation function, and the sound absorption plate is arranged, so that the sound insulation effect is good. The noise is further absorbed, the overall sound insulation performance of the equipment is improved, and through the multi-layer sound insulation materials and the structural design, noise pollution generated when the equipment operates is effectively reduced.

The utility model relates to the technical field of centrifugal fans, and discloses a low-noise centrifugal fan which comprises a base, a shell is fixedly connected to the outer wall of the base, a rotor is installed in the shell, a motor is installed on the outer wall of the top of the base, and the tail end of an output shaft of the motor extends into the shell and is fixedly connected with the rotor. The rotor comprises a hub and a plurality of blades evenly distributed on the outer wall of the hub, the front edges of the blades are provided with arc-shaped flow guide edges, the rear edges of the blades are provided with sawtooth grooves, a damping mechanism is installed between the base and the motor, and the base is connected with the motor through the damping mechanism. And starting from the key part of the interaction of the airflow and the impeller, the pneumatic noise and the vortex noise are greatly reduced, and the noise pollution condition during the operation of the fan is effectively improved.

The noise reduction type vacuum pump comprises a vacuum pump main body and a driving motor, a mounting groove is formed in the side wall of the vacuum pump main body, a damping and noise reduction mechanism is mounted on the vacuum pump main body, and the damping and noise reduction mechanism comprises a plurality of damping grooves symmetrically formed in the vacuum pump main body; the inner walls of the multiple damping grooves are in sealed sliding connection with multiple damping rods, the other ends of the multiple damping rods penetrate through the inner wall of the mounting groove and are fixedly connected with the side wall of the driving motor, the side wall of the driving motor is fixedly connected with multiple damping springs, and the multiple damping springs are arranged on the side walls of the multiple damping rods in a sleeving mode correspondingly; a plurality of first cavities are formed in the vacuum pump body. Vibration generated in the operation process of the driving motor can be buffered and consumed, so that the vibration is relieved, noise is indirectly reduced, the first sound receiving groove and the second sound receiving groove can also absorb the noise, the noise is further reduced, and noise pollution is avoided.

The utility model discloses a low-noise cross-flow cooling tower which comprises a tower body, a controller fixedly connected to the upper portion of the tower body, fan blades rotationally connected to the upper end of the controller, a shell fixedly installed at the outer ends of the fan blades, and a sound insulation cover fixedly connected to the outer end of the shell. A fixing plate is fixedly mounted on the outer side of the sound insulation cover, and a buffer spring is fixedly connected to the lower end of the fixing plate; the mounting plate is fixedly connected to the inner wall of the tower body, a groove is fixedly formed in the upper end of the mounting plate, a buffer plate is fixedly connected to the front end of the mounting plate, and sound-absorbing cotton is fixedly mounted in the buffer plate, so that the problems that impact noise is generated by impact force of flow on the inner wall of the tower body in the background technology, and noise is caused are solved; and the fan rotates to exhaust hot air in the cooling tower, and when the fan is started, the fan vibrates to generate a large amount of noise, so that eardrums of workers are damaged subsequently.

The utility model discloses a structure and decoration integrated precast concrete slab applied to elevated station transformation, the precast concrete slab is composed of a steel bar group and concrete wrapping the steel bar group, the steel bar group comprises an inverted U-shaped steel bar group, an inverted trapezoidal steel bar group and an inclined reinforcing steel bar group, the inverted U-shaped reinforcing steel bar group is composed of two vertical reinforcing steel bar groups and a first transverse reinforcing steel bar group, the inverted trapezoidal reinforcing steel bar group is composed of a second transverse reinforcing steel bar group, a third transverse reinforcing steel bar group and two inclined reinforcing steel bar groups, and the number of the inclined reinforcing steel bar groups is two; the upper portion of the prefabricated concrete plate is provided with a shutter installation groove used for installing the ventilation and smoke exhaust shutter, and the middle portion and the lower portion of the prefabricated concrete plate are each provided with a glass installation groove used for installing the double-layer laminated glass. The prefabricated concrete slab has the advantages that the adverse factors of long construction period, many potential safety hazards, dust raising, serious noise pollution, limited construction working surface and the like of the traditional integral cast-in-place can be effectively avoided by using the prefabricated concrete slab.

The invention relates to the technical field of thermal compensation of magnetic suspension compressors, and discloses a shell thermal compensation sealing mechanism and method of a magnetic suspension two-stage compressor, which solve the problem of poor sealing performance, the shell thermal compensation sealing mechanism comprises a two-stage compressor outer shell, and a two-stage compressor inner shell is arranged in the two-stage compressor outer shell; a permanent magnet motor is arranged in the second-stage compressor inner shell, radial magnetic suspension bearings are arranged at the left end and the right end of the permanent magnet motor correspondingly, a sensor assembly is arranged on the outer side of each radial magnetic suspension bearing, an axial magnetic suspension bearing stator is arranged on the outer side of the sensor assembly at the right end, and a rotor is arranged in the permanent magnet motor. A protection bearing is arranged outside each rotor, and impellers are arranged at the left end and the right end of each rotor. According to the device, the high-temperature-resistant elastomer is used for reducing noise while reducing vibration, so that noise pollution is prevented, meanwhile, the temperature of the inner shell of the second-stage compressor can be conveniently reduced under the action of the cooling pipe, and the stability of the inner shell of the second-stage compressor is guaranteed.

The utility model discloses a silencing device, belongs to the technical field of compressor silencing equipment, and particularly relates to a compressor test run silencing device which comprises a sound insulation box body and a silencing assembly. The silencing assembly is fixedly installed in the sound insulation box body. The two ends of the noise elimination assembly are connected with the two ends of the sound insulation box body through noise elimination connecting valves. The noise elimination connecting valve is composed of an outer cylinder, an inner cylinder, a connecting opening, a fixing bayonet and a fixing base. Effective sound insulation between the outside and the inside of the box body is achieved through the sound insulation box body, noise generated during test run of the compressor is subjected to first-step noise reduction input through the noise reduction connecting valve, then main noise reduction work is carried out through the noise reduction assembly, the sound volume can be effectively reduced through the noise reduction pipeline and the noise reduction plate, and the noise reduction effect is good. And meanwhile, noise reduction output is carried out through the noise reduction connecting valve, so that the noise generated during the test run of the compressor can be greatly reduced, the working personnel are protected, and the noise pollution is reduced.

The utility model discloses a shock-absorbing and noise-reducing device for sleeper production, which relates to the field of railway noise reduction and comprises a shock-absorbing platform used for supporting mortar compaction equipment; the bottom plate is arranged below the damping platform and used for supporting the damping platform; the number of the supporting mechanisms is multiple, and each supporting mechanism comprises a vertical compression mechanism and at least one inclined strut moving mechanism; the top of the vertical compression mechanism is connected with the damping platform, and the bottom of the vertical compression mechanism is connected with the bottom plate. The top of the inclined strut moving mechanism is hinged to the damping platform, and the bottom is slidably connected with the bottom plate. The height of the vertical compression mechanism can be elastically changed, and the inclination angle of the inclined strut moving mechanism can be elastically changed. According to the damping platform provided for the mortar vibration compaction equipment, residual vibration generated by the mortar vibration compaction equipment can be subjected to multi-direction vibration reduction through the inclined strut moving mechanism, so that the purposes of avoiding environmental noise pollution and avoiding damage to non-vibration parts of the mortar vibration compaction equipment are achieved.

The utility model relates to the technical field of building construction, and discloses an acoustic edge covering structure for noise reduction engineering, which comprises a wall body, the surface of the wall body is bonded and connected with a damping sound-absorbing pad, the surface of the damping sound-absorbing pad is fixedly connected with a deadening felt, the surface of the deadening felt is paved with a glass fiber layer, and the surface of the glass fiber layer is fixedly connected with the wall body. And the interior of the glass fiber layer is fixedly connected with fixed reinforcing ribs. According to the acoustic edge covering structure for the noise reduction project, through cooperative arrangement of the damping sound absorption pad, the sound insulation felt, the glass fiber layer, the inner flame-retardant sound absorption cloth and the sound absorption and insulation cotton, the effect of multi-layer combined sound absorption and noise reduction in the building construction process of the noise reduction project is achieved, the strength of sound absorption and noise reduction is improved, and the acoustic edge covering structure is more environmentally friendly; according to the noise reduction acoustic edge covering structure, noise pollution in the aspect of building use is reduced, through the arrangement of the fixing reinforcing ribs, the fixing reinforcing ribs reinforce the supporting force for the interior of the acoustic edge covering structure in the use process, and the effect of enhancing the stable strength of the noise reduction acoustic edge covering structure is achieved.

The utility model relates to the technical field of wind prevention and noise elimination, and discloses a stadium efficient wind prevention and noise elimination device which comprises a front plate, the front plate is a 1 mm galvanized plate, the front plate is provided with a wave-shaped structure with alternate wave troughs and wave crests, and holes are evenly formed in the middles of the wave troughs and the wave crests and used for increasing the surface area of the front plate and dispersing wind resistance. Meanwhile, air circulation is ensured; and the back plate is a 2mm aluminum alloy plate, and the inner side of the back plate is coated with a polyurethane coating as a reflecting layer, so that the sound insulation effect is enhanced. By adopting the wave-shaped design of the front plate, wind resistance can be effectively dispersed, the wind speed can be reduced, meanwhile, air circulation is guaranteed, and a comfortable environment is provided for athletes and audiences; the design of the rear plate combining the aluminum alloy plate and the polyurethane coating provides excellent reflection and sound insulation effects, and noise pollution is remarkably reduced.

The utility model relates to the technical field of wake flow breaking and noise reducing devices, and discloses a wake flow breaking and noise reducing device which comprises a barrel body, a first connecting piece and a second connecting piece, one side of the inner wall of the barrel body is provided with an internal thread, the outer side of the end face of one side of the barrel body is fixedly connected with annular teeth at equal intervals, and the outer wall of the barrel body is provided with windows at equal intervals. A plurality of windows are formed in the barrel body, strip-shaped teeth are arranged on the two sides of the interiors of the windows, every two strip-shaped teeth are oppositely arranged, a cylindrical through hole is formed in the barrel body, the side, provided with the internal threads, of the barrel body is an inlet of the barrel body, and the side, provided with the annular teeth, of the barrel body is an outlet of the barrel body. According to the utility model, through the design of the annular teeth at the outlet and the strip-shaped teeth at the window of the barrel body, the fluid is effectively shunted and gently adjusted, and turbulent flow and vortex are obviously reduced, so that the noise is reduced, the environmental comfort is improved, the noise pollution control standard is met, and a quiet and harmonious environment is created for a user.

The pneumatic device of the heat preservation three-way valve comprises a triangular supporting plate, a pneumatic valve body is arranged at the position, close to the bottom, of the front surface of the triangular supporting plate, a valve seat is fixedly arranged at the top of the pneumatic valve body, and energy absorption pads are fixedly arranged at the positions, close to the triangle, of the front surface of the triangular supporting plate. A cavity is formed in the energy absorption pad, a supporting pad is arranged at the position, close to the middle, in the energy absorption pad, and a damping spring is fixedly arranged on the rear surface of the supporting pad. According to the pneumatic device of the heat preservation three-way valve, by arranging an energy absorption pad, a sound absorption cotton strip, a supporting pad, a damping spring and a damping spring, when the pneumatic device is used, the vibration sense generated by the pneumatic device and noise generated by resonance can be absorbed and reduced, the stability of the pneumatic device during operation is improved, noise pollution is reduced, convenience is brought to a user, and the pneumatic device is worthy of popularization and application. The practicability of the device is improved, and the use requirements of users are met.

The present invention discloses an interlocking, shear-resistant segment connection structure for the assembly of the segment ring of the originating and receiving section, which includes a pre-embedded inner sleeve and a connecting inner core, wherein the pre-embedded inner sleeve is pre-embedded at the end of the segment to be spliced ​​and has a connecting groove, wherein the connecting groove includes a first and a second groove body, wherein the second groove body is divided into multiple levels of slots from the outside along the extension direction of the first groove body, and each level of slots is composed of a plurality of second groove bodies distributed around the center of the first groove body; the connecting inner core includes a first and a second core body, wherein the first and the second core bodies are respectively inserted into the connecting groove; and the outer periphery of the first and the second core bodies also respectively has a protrusion that interlocks with each level of slots of the corresponding connecting groove. The present invention not only solves the problems of misalignment, opening, and uneven force on the inner and outer arc surfaces between the segments, but also the inner and outer wall surfaces of the segment ring formed are very flat and beautiful, and are not easy to rust, thus ensuring the bearing capacity and durability. In addition, the assembly is convenient, and no large smoke, harmful gas, or noise pollution is generated.

The utility model discloses a house drainage layer steel structure which comprises a wall body, a noise reduction layer is arranged at the upper end of the wall body, first square-frame-shaped sound absorption cotton is arranged at the upper end in the noise reduction layer, a square-frame-shaped connecting plate is arranged at the position, located at the lower end of the first sound absorption cotton, in the noise reduction layer, and a ceiling with an inner cavity is installed above the noise reduction layer. Second sound-absorbing cotton is arranged on the inner side wall of the ceiling, and fixing columns are evenly installed at the upper end of the ceiling. The novel drainage channel has the advantages that through the design of the noise reduction layer, the first sound absorption cotton, the fixing columns and the rubber soft cushion, in the process that noise caused by the fact that rainwater hits the surface of the drainage channel is transmitted into a room, the first sound absorption cotton and the second sound absorption cotton in the noise reduction layer are used for absorbing and reducing the noise to a certain degree; and then the contact area between the drainage channel and the ceiling is reduced through the rubber soft cushion and the fixing columns, noise is secondarily reduced, and therefore noise pollution caused by the fact that rainwater hits the surface of the drainage channel is prevented.