4 results about "Noise effects" patented technology

The utility model relates to the technical field of power transformers, and discloses a low-noise dry-type power transformer which comprises a dry-type power transformer body and a noise reduction outer box, the dry-type power transformer body is fixedly installed on the inner side of the noise reduction outer box, and annular sound absorption ends are arranged on the two sides of the noise reduction outer box. According to the sound-absorbing and noise-reducing box, noise can be conducted into the sound-absorbing and noise-reducing pipe from the annular sound-absorbing end head for sound absorption and noise reduction, the cross-shaped sound-absorbing plate and the rectangular sound-absorbing plate are arranged in the sound-absorbing and noise-reducing pipe, the sound-absorbing and noise-reducing capacity is enhanced, the sound-absorbing and noise-reducing outer cylinder is used for noise reduction and sound absorption, and the noise-reducing type base plate assists in noise reduction and sound absorption in the box body. And the sound-absorbing and noise-reducing pipe is mounted on the annular sound-absorbing end in a sleeving manner, and the sound-absorbing and noise-reducing outer cylinder is mounted at the other end of the sound-absorbing and noise-reducing pipe, so that the overall disassembly and assembly are convenient, the sound-absorbing and noise-reducing capability and the sound-absorbing and noise-reducing effect of the device are excellent, the overall disassembly and assembly are simple and convenient, and the sound-absorbing and noise-reducing device is suitable for popularization and use.

This application discloses a thermally broken aluminum alloy casement window, belonging to the field of doors and windows. It includes an outer frame, an inner frame installed inside the outer frame via a thermally broken strip, a side frame mounted on the inner wall of the inner frame via two hinges, a sash frame fixedly installed on one side of the side frame, and a glass assembly installed inside the sash frame. Both the inner frame and the sash frame are equipped with Helmholtz resonators. The sound insulation layer filled inside the sash frame effectively isolates external noise and reduces the impact of internal noise. At the same time, some sound energy can be absorbed by the outer tempered glass and the intermediate PVB film, while the air layer of the inner double-glazed glass can further block the transmission of sound waves. Furthermore, the Helmholtz resonator can be used to specifically absorb noise of a certain frequency.

The noise reduction protection room for construction comprises a plurality of supporting bodies, the tops of the supporting bodies are fixedly connected through two longitudinal upper mounting rods, and the bottom of each longitudinal upper mounting rod is connected with a longitudinal lower mounting rod through a plurality of vertical mounting rods; the ends of the two longitudinal upper mounting rods are fixedly connected through the two transverse mounting rods to form a square-shaped frame, and the ends of the transverse mounting rods are fixedly connected with the two longitudinal lower mounting rods through the vertical mounting rods. Side sound barriers are fixed to the first sound barrier mounting area and the second sound barrier mounting area; top sound barriers are fixed to the tops of the supporting bodies. According to the noise reduction protection room for construction, the top sound barrier and the side sound barriers can shield wind and rain for the noise reduction protection room for construction, meanwhile, the top sound barrier and the side sound barriers can block most noise generated in the protection room, a good noise reduction effect is achieved, and the influence of building processing noise on the surrounding living environment can be greatly reduced.