6results about How to "Guaranteed sound absorption performance" patented technology

The utility model relates to the technical field of air conditioner outdoor unit shells, in particular to a noise reduction shell for an air conditioner outdoor unit, which comprises a bottom plate, a box body is fixedly mounted at the upper end of the bottom plate, a mounting groove is formed in the front end of the box body, a ventilation plate is fixedly mounted in the mounting groove, and a mounting plate is fixedly mounted on the box body. A top cover is fixedly mounted on the mounting plate through a bolt, a placement box is fixedly mounted at the bottom in the box body, a rubber plate is fixedly mounted on the inner wall of the placement box, and the top cover can be separated from the mounting plate and opened by rotating the bolt, so that the air conditioner outdoor unit body is conveniently placed on the rubber plate in the placement box; the rubber plate can play a buffering role on the air conditioner outdoor unit body, noise generated by vibration of the rubber plate is reduced, the pulling plate is pulled, the limiting plate is separated from the sound absorption plate, limitation of the limiting plate on the sound absorption plate is relieved, the sound absorption plate can be taken out of the mounting block to be cleaned or replaced, the sound absorption effect of the sound absorption plate is guaranteed, and operation is easy.

The utility model discloses a household music practice room which comprises a music practice room structure, an auxiliary sound insulation structure is detachably installed on the music practice room structure, a musical instrument assembly is placed in the music practice room structure, the music practice room structure comprises a household music room, and a sound insulation assembly is fixed on the household music room. The sound insulation assembly comprises a sound insulation felt layer, a sound absorption cotton layer is detachably installed in the sound insulation felt layer, a sound insulation plate layer is detachably installed in the sound absorption cotton layer, a sound absorption plate layer is detachably installed in the sound insulation plate layer, a sound absorption carpet is placed on the lower side of the interior of the sound absorption plate layer, and an illuminating lamp and a mute ventilating fan are detachably installed on a sound absorption ceiling plate. According to the household music practice room, the sound absorption effect is guaranteed through the arrangement of the sound insulation felt layer, the sound absorption cotton layer, the sound insulation plate layer, the sound absorption plate layer and the sound absorption carpet, internal stuffiness is avoided through the arrangement of the mute ventilator, and the ventilation effect is achieved.

An embodiment of the present specification provides an acoustic device comprising: a diaphragm; the shell is used for containing the vibrating diaphragm and forming a first acoustic cavity and a second acoustic cavity which correspond to the front side and the rear side of the vibrating diaphragm respectively, and the vibrating diaphragm radiates sound to the first acoustic cavity and the second acoustic cavity respectively; sound is led out through a first acoustic hole coupled with the first acoustic cavity and a second acoustic hole coupled with the second acoustic cavity; the sound absorption structure is coupled with the second acoustic cavity and is used for absorbing sound transmitted to the second acoustic hole through the second acoustic cavity in a target frequency range, the sound absorption structure comprises a micro-perforated plate and a cavity, the micro-perforated plate comprises a through hole, the cavity is used for accommodating the through hole, and the through hole is communicated with the cavity. The second acoustic cavity is communicated with the cavity through the through hole; and the hanging structure is used for wearing the shell at a position near the ear canal of a user but not blocking the ear canal.

The utility model relates to a kind of sound-absorbing cotton mounting device of air conditioning unit and railway vehicle air conditioning unit, sound-absorbing cotton is pasted on the shell of air conditioning unit, the sound-absorbing cotton is also fixed on shell by several heat preservation nails, the heat preservation nail is composed of panel and nail rod, pressure plate is installed on the panel, the pressure plate is fixedly connected with shell by the nail rod and utilizes pressure plate to press the panel tightly fixed on shell, the nail tip part of the heat preservation nail passes through sound-absorbing cotton and is fixed by nail cap.The utility model sound-absorbing cotton is fixed by back glue and heat preservation nail with shell, provides the function of secondary protection to sound-absorbing cotton, can ensure the stability and reliability of sound-absorbing cotton installation, guarantee the noise reduction effect of air conditioning unit, simultaneously, since heat preservation nail and shell do not need to be fixed by fastener or by the mode of welding additionally, the fixed installation and replacement of heat preservation nail can be facilitated, improve installation and replacement efficiency.

The invention belongs to the technical field of silencers, and particularly relates to an air damping silencer which comprises an air inlet pipe, a main body mechanism is fixedly connected to the outer wall of the air inlet pipe, an air outlet end pipe is fixedly connected to the end, away from the air inlet pipe, of the main body mechanism, and a sound insulation layer is fixedly connected to the inner wall of the main body mechanism; the air damping silencer further comprises a dust removing mechanism and a filtering mechanism, the outer wall of the dust removing mechanism is fixedly connected with the inner wall of the main body mechanism, the filtering mechanism is used for intercepting dust in airflow inside and directly transporting the dust outwards, the outer wall of the filtering mechanism is fixedly connected with the inner wall of the main body mechanism, and the filtering mechanism is used for filtering the dust in the main body mechanism. By arranging the filtering mechanism, contact between dust in airflow and the noise reduction layer is reduced, dust attached to the noise reduction layer is reduced, the service life of the noise reduction layer is prolonged, meanwhile, dust accumulated in the noise reduction layer can be automatically cleaned, the frequency of disassembling equipment for overhauling is reduced, and long-time use of the equipment is maintained.

The invention belongs to the technical field of noise reduction of direct-cooling doubly-fed wind driven generators, and provides a noise reduction device and method for a direct-cooling doubly-fed generator considering noise characteristics and a generator, which consider the noise characteristics of aerodynamic noise, mechanical noise, electromagnetic noise, vibration noise and the like from a noise generation mechanism. From noise sources such as a base bottom, a base stator junction box, a base heater, a front end cover, a rear end cover, a cooler main body, a cooler air outlet, a slip ring chamber and the like for generating and transmitting noise with various characteristics, noise reduction mechanisms of which noise reduction materials are foamed aluminum plates are respectively arranged on the noise sources, and the noise generation mechanism is started. The characteristics of aerodynamic noise, mechanical noise, electromagnetic noise, vibration noise and the like are considered, foamed aluminum plates are arranged on source parts corresponding to the positions where noise is generated by the generator for noise reduction, and the problem that noise reduction of an existing direct-cooling doubly-fed generator is easy to fall off and age due to the fact that a sound-absorbing material is adopted is solved. Generation of noise of the generator is effectively reduced.