5results about How to "Lower the decibel" patented technology

This invention discloses a micro-perforated noise-reducing air outlet structure and a hair dryer with the micro-perforated noise-reducing air outlet structure. The micro-perforated noise-reducing air outlet structure includes a shell with an air outlet; a fan assembly installed inside the shell and axially distributing air towards the air outlet; and a micro-perforated component, which is a box-shaped structure with an inner cavity. The micro-perforated component is installed inside the shell and connected to the air outlet. The circumferential sidewall of the micro-perforated component and the inner sidewall of the air outlet are spaced apart to form an air outlet channel. Several micro-holes are opened on the sidewall of the micro-perforated component facing the fan assembly. The inner cavity is connected to the inside of the shell through the micro-holes, and a sound-absorbing component is placed in the inner cavity. The inner cavity of the micro-perforated component constitutes a sound-absorbing cavity that is not air-permeable, achieving a sound-absorbing effect without increasing wind resistance or reducing the air velocity and air pressure.

The utility model discloses a blast furnace gas pipeline silencer which comprises a shell, a gas inlet is formed in one side of the shell, a gas outlet is formed in the other side of the shell, a silencing assembly is arranged in the shell and comprises a silencing plate, a second silencing cavity is formed in the inner wall of the shell, and a gas outlet is formed in the other side of the shell. The inner wall of the second silencing cavity is connected with a sound absorption plate through bolts, one side of the sound absorption plate is connected with a silencing plate through bolts, the circumferential inner wall of the silencing plate is provided with a first silencing cavity, the circumferential outer wall of the silencing plate is connected with a fixing column through bolts, and one end of the fixing column is connected with the inner wall of the shell through bolts. According to the blast furnace gas pipeline silencer, due to the fact that the silencer is provided with the silencing assembly, the noise reduction effect of the device can be better improved, and due to the fact that the device is provided with the overhauling assembly, the service life of the device can be better maintained.

The utility model discloses an air intake and exhaust silencer of a cogeneration unit, which relates to the technical field of cogeneration units and comprises a unit shell, an air intake pipe and an exhaust pipe are arranged on two sides of the unit shell respectively, and silencing cylinders are arranged at the ends of the air intake pipe and the exhaust pipe. Through the arrangement of the lead screw, the guide ring, the threaded block, the torsional spring, the clamping disc, the clamping hook, the gear ring and the gear, when the silencer is installed, a worker inserts the silencing barrel into the air inlet pipe or the exhaust pipe, then the worker rotates the gear ring, and the silencer is installed on the air inlet pipe or the exhaust pipe. The gear ring rotates to enable the gear to rotate, then the lead screw rotates, the threaded block drives the clamping hooks to move downwards, under the action of the guide ring, the multiple sets of clamping hooks can be folded inwards, when the clamping hooks move downwards to a certain degree, the clamping hooks can be tightly connected to the clamping disc in a lap joint mode, and then the silencing cylinder installation work is completed.

The utility model provides a residual pressure noise reduction and efficiency improvement device for ceramic membrane equipment, which belongs to the technical field of noise reduction of the ceramic membrane equipment and comprises a residual pressure exhaust pipeline, a first electric valve is arranged on the residual pressure exhaust pipeline, a pressure dividing cylinder is arranged at the air outlet end of the residual pressure exhaust pipeline, and a bypass pipeline is arranged between the pressure dividing cylinder and the first electric valve. The bypass pipeline is communicated with the excess pressure exhaust pipeline, the two sides of the pressure dividing cylinder are respectively provided with a first pressure relief pipe, and the air outlet end of each first pressure relief pipe is communicated with a noise reduction device. Pressure gas is exhausted into the pressure dividing cylinder through the excess pressure exhaust pipeline, pressure is guided into the first pressure relief pipes on the two sides through the pressure dividing cylinder, and the noise reduction device is arranged at the air outlet end of each first pressure relief pipe; the first pressure relief pipe extends into the noise reduction cylinder in the noise reduction device, so that pressure impact is reduced through a water body, noise is counteracted, then pressure relief and noise reduction operation is completed, the decibel of the noise is effectively reduced, the ceramic membrane equipment can be remotely matched for frequent operation, and a good working environment is provided for workers.

The utility model relates to an aluminum-wood composite out-opening window, which belongs to the technical field of composite out-opening windows and comprises a window frame, two window sashes are mounted in the window frame, a vertical rod is fixedly connected to the middle of the window frame, the two window sashes are respectively arranged on two sides of the vertical rod, glass bodies are mounted in the window sashes, and battens are fixedly connected in the window sashes. According to the utility model, the section bar III, the glass plates and the battens are matched for use, and the section bar III is made of an aluminum wood material, so that the hollow section bar III can better block the propagation of noise, and the three layers of glass plates can further block the propagation of noise and can reduce the harm of ultraviolet rays to indoor personnel; the wood strips are made of wood, and the wood contains certain holes, so that the wood can absorb more noise, the decibel of the noise transmitted into a room through the out-opening window is reduced, a good and comfortable environment is provided for indoor personnel, and the attractiveness of the out-opening window can be improved.