10results about How to "Reduce sound intensity" patented technology

The invention discloses a new medicine application of a local injection acoustic response stent in enhancing ultrasound histotripsy. The acoustic response scaffold (ARS) comprises a scaffold material, fluorocarbon gas or liquid fluorocarbon particles with liquid-vapor phase change capacity, and microbubble cloud in the scaffold generates a strong cavitation ablation treatment effect in a target area under the action of low-frequency and low-sound-pressure ultrasound. Fluorocarbon gas or liquid fluorocarbon particles contained in the ARS form microbubble cloud and ideal cavitation nuclei under low-frequency low-sound-pressure ultrasonic excitation, inertia cavitation resonance is achieved under the ultrasonic action, and then cavitation mechanical damage with local tissue controllable strength is generated. The low-intensity ultrasonic histotripsy has the characteristics of low sound pressure, low sound intensity, high targeting property, small tissue damage outside a target region, simplicity in instrument manufacturing and the like, and the targeting property and the safety of treatment are improved. The method does not need very accurate ultrasonic focusing, reduces the operation difficulty, and has application prospects in multiple medical fields such as prostatic hyperplasia, tumor ablation and tumor immunotherapy.

The utility model relates to a ventilation sound insulation structure and a sound insulation window, and belongs to the field of sound insulation windows. The ventilation and sound insulation structure comprises a shell, one side of the shell is provided with an air inlet hole, and the other side of the shell is provided with an air outlet hole; the fan is mounted in the shell; the air deflector is fixed in the shell; the first sound insulation plate is fixed in the shell and is provided with a first through hole; the second sound insulation plate is fixed in the shell, is parallel to the first sound insulation plate and is provided with a second through hole; wherein the first through holes and the second through holes are arranged in a staggered mode, and a fiber layer is arranged between the first sound insulation board and the second sound insulation board. According to the ventilation and sound insulation structure and the sound insulation window, indoor and outdoor air flow exchange can be controlled through the draught fan, so that indoor air flow circulation is achieved, and through mutual cooperation of the first sound insulation plate, the second sound insulation plate and the fiber layer, the influence of external urban noise pollution on the normal life and mental health of indoor people is conveniently reduced.

The utility model discloses a surface polishing device for sheet metal processing, which belongs to the technical field of sheet metal surface polishing and comprises a polishing box body, one side of the polishing box body is fixedly connected with a first fixing plate, one side of the first fixing plate is fixedly connected with a first motor, and one side of the first motor is fixedly connected with a threaded shaft. One end of the threaded shaft is fixedly connected with a balance plate, the outer side of the threaded shaft is in threaded connection with a threaded plate, one side of the polishing box body is provided with a first sliding groove, the first sliding groove is in sliding connection with the threaded plate, and one side of the threaded plate is fixedly connected with a connecting plate. And the fire threat is avoided while the grinding noise is reduced, and certain practicability is achieved.

The invention discloses an ultrasonic wind speed and wind direction measuring device which comprises a top end structure, east, west, south and north transducer reflecting cup combinations mounted on the lower surface of the top end structure, a bottom end reflecting surface, a temperature and humidity sensor, a heating block and a signal control processing circuit device, wherein the temperature and humidity sensor and the heating block are mounted on the bottom end reflecting surface. According to the energy converter reflection cup combination, the designed reflection cups are used for reducing the lobe directional angle of a signal transmitted by the energy converter, so that the energy is more concentrated, the strength of the signal received by the energy converter at the receiving end is higher, meanwhile, the energy converter reflection cups are installed on the top end plane of the structure, and the cup openings face the bottom end plane; the bottom end plane is used as the reflecting surface, and the rain shielding characteristic of the reflecting cup is utilized, so that the surface of the transducer cannot accumulate water and freeze all the time, and the accuracy of measurement in windy and rainy weather is improved.

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 relates to the technical field of silencers, in particular to a secondary silencer of a vehicle-mounted air conditioner and a silencing method. The secondary silencer comprises a shell, a shell cover, a connecting pipe, a silencing pipe, a first silencing cavity and a second silencing cavity; the vehicle-mounted air conditioner secondary silencer is installed at the preset position of a vehicle; the secondary silencer of the vehicle-mounted air conditioner is used for silencing the vehicle-mounted air conditioner, under the simultaneous sound absorption and silencing effects of the two silencing cavities, the sound intensity is greatly reduced, finally, the sound is further weakened through the silencing cotton interlayer, the noise is reduced again, the comfort is improved when a long-distance driver has a rest, other people are prevented from being influenced, and the vehicle-mounted air conditioner is safe and reliable. Therefore, the problem that an existing vehicle-mounted air conditioner silencer is low in silencing efficiency is solved.

The utility model relates to the technical field of space capsules, in particular to a safety door for a space capsule, which comprises a safety door main body, a glass window for observing from inside to outside of the space capsule is fixed on one side of the safety door main body through screws, and a cross rod for driving a driving block to slide is welded on the inner side of the safety door main body. A telescopic frame connected with a buffer plate is rotationally connected to one side of the driving block, a damping spring B for buffering is welded to the outer side of the telescopic frame, a supporting plate moving in a fixing frame welded in the safety door body is welded to one side of the buffer plate, and a buffer spring for buffering is welded to the interior of the fixing frame. The outer side of the cross rod is sleeved with a damping spring A for buffering; through the arrangement of the cross rod, the driving block, the damping spring A, the damping spring B, the fixing frame, the buffer spring, the supporting plate and the buffer plate, the problems that when an existing safety door for the space capsule is used, impact force generated by collision of the safety door cannot be reduced, and the safety door is inconvenient to protect are solved.

The utility model belongs to the technical field of tea rolling machines, and particularly relates to a speed reduction structure of a tea rolling machine. Comprising a power assembly and a planet wheel mechanism, the power assembly drives the planet wheel mechanism to operate, and the oil dripping assembly is arranged on the rotating shaft and used for dripping oil on the planet wheel mechanism; the oil dripping assembly comprises a shaft sleeve arranged on the rotating shaft; the bracket is arranged on the shaft sleeve; the storage tank is arranged on the bracket; the oil dripping pipe is arranged on the lower side of the storage tank and located above the rotating shaft; the ball valve is arranged on the oil dripping pipe and used for controlling opening and closing of the oil dripping pipe; and the inner cooling channel is formed in the rotating shaft and penetrates through the end, located on the planet wheel mechanism, of the rotating shaft, the track of the inner cooling channel is obliquely arranged from top to bottom in the length direction of the rotating shaft, and the inner cooling channel is located on the lower side of the oil dripping pipe. The speed reduction structure of the tea rolling machine can drip lubricating oil on the planetary gear, effectively reduce abrasion and prolong the service life.

The utility model discloses hollow glass with a sound insulation structure, which comprises a glue sealing frame and sealing layers, a first outer glass plate and a second outer glass plate are packaged in the glue sealing frame, and the sealing layers are formed between the edges of the first outer glass plate and the second outer glass plate and the glue sealing frame. A hollow layer is formed in the glue sealing frame through a first outer glass plate and a second outer glass plate, a first inner glass plate adheres to the inner side of the first outer glass plate, and a second inner glass plate adheres to the inner side of the second outer glass plate. According to the hollow glass with the sound insulation structure, the hollow layer, the first inner glass plate and the second inner glass plate are arranged, the first inner glass plate and the second inner glass plate are different in thickness, and energy of sound waves is dispersed to different frequencies, so that the resonance phenomenon of any single frequency is reduced, and the intensity of sound transmitted from one side to the other side is effectively reduced; structural sound insulation is achieved, and the problem that the sound insulation effect is poor is solved.

The utility model provides a kind of metallized polypropylene film capacitor noise reduction device, it is related to capacitor technical field, comprising: capacitor, the one side of capacitor is equipped with two power lines, the upper and lower positions of capacitor are respectively installed one noise reduction board, the outside position of noise reduction board is installed one first cache sponge, the outside position of first cache sponge is installed one protective inner shell, protective inner shell has two, the outside position of protective inner shell is respectively installed one first protective outer shell, one second protective outer shell.Noise reduction board inside face is established honeycomb structure noise reduction groove, can make incoming sound wave constantly reflect and refract, effectively consume sound wave energy, first cache sponge and second cache sponge and noise reduction board mutually cooperate, further enhance the sound insulation effect, so that noise reduction board can more effectively absorb noise, solve the problem that capacitor generates noise and influences surrounding environment.