33results about How to "To achieve the effect of sound insulation" patented technology

The invention discloses a thermal insulation, sound insulation and environmental protection solid wood composite door, which relates to the technical field of production and processing of solid wood composite doors. In order to solve the problem of sound insulation of the existing solid wood composite doors, a bridge cavity mechanical plate is generally used for sound insulation, but the noise decibel is as high as When it is fifty decibels and above, its sound insulation effect begins to show obvious deficiencies, and we need to strengthen it. The inside of the solid wood composite door body is provided with a solid wood keel board, and the outer walls of the upper and lower ends of the solid wood keel board are provided with high-density boards, and the high-density board is fixedly connected with the solid wood keel board, and the outer wall of the high-density board is provided with There is a solid wood cortex, and the solid wood cortex is fixedly connected with the high-density board, and the inner wall of the high-density board is provided with noise reduction through holes, and the noise reduction through holes are fixedly connected with the high density board, and there are several noise reduction through holes. A sound-absorbing sponge body is arranged inside the noise-reduction through hole, and the sound-absorbing sponge body is fixedly connected with the noise-reduction through hole.

The invention belongs to the field of marine engineering vibration and noise, and provides a polygonal double-layer frame airbag underwater piling noise reduction and dustproof device, which includes an external air compressor, an airbag, and inner and outer steel horizontal and vertical support rods. Double-layer frame, the inner and outer frames are respectively connected by horizontal and vertical struts through pipe clips, and are arranged in regular polygons in the circumferential direction of the pile foundation according to the construction arrangement. The inner and outer frames are connected by horizontal struts through tube clips. The air bag is arranged between the inner and outer frames, and the frame is connected with the frame through a prefabricated lock on the air bag, and the external air compressor is connected with the upper part of the air bag. The invention has simple structure, is stable and durable, can be flexibly combined, disassembled and assembled for many times, has designability, and has good sound absorption and noise reduction effect. Helps maintain ecosystem balance.