9results about How to "Play a noise reduction effect" patented technology

The utility model discloses a noise reduction type integrated power distribution cabinet, which relates to the technical field of power distribution cabinets and comprises a cabinet body, a cabinet door, a control meter and an indicator light are arranged on the outer side of the cabinet body, and an automatic heat dissipation assembly, sound insulation cotton and an installation assembly are arranged in the cabinet body. According to the noise reduction type comprehensive power distribution cabinet, the sound insulation cotton is rapidly installed through the installation assembly, so that the cabinet body has a noise reduction effect in the use process, and noise pollution to the surrounding environment is avoided; the temperature inside the cabinet body is monitored in real time through the temperature sensor, when the temperature inside the cabinet body is higher than a set value, the motors are started through the control circuit board, the output ends of the four sets of motors drive the fan blades to discharge the temperature inside the cabinet body, and therefore heat dissipation is conducted in time, and when the temperature is lower than the set value, heat dissipation is conducted. And the control circuit board controls the motor to stop running, so that an energy-saving effect is achieved.

The utility model relates to the field of air conditioner fresh air exchange fans, in particular to an air conditioner fresh air exchange fan with a noise reduction function. Comprising a machine box, a storage cavity is formed in the machine box, two sets of first sliding grooves are symmetrically formed in the edge of the inner wall of the top of the machine box, two sets of second sliding grooves are symmetrically formed in the edge of the inner wall of the bottom of the machine box, and two sets of silencing honeycomb plates are symmetrically arranged in the storage cavity; the top of each group of silencing honeycomb plates is slidably clamped in one group of first sliding grooves, the bottom of each group of silencing honeycomb plates is slidably clamped in one group of second sliding grooves, a plurality of groups of sound absorption holes are formed in the inner wall of the top of the case and the inner wall of the bottom of the case at equal intervals, and the plurality of groups of sound absorption holes communicate with the storage cavity; and a set of wave sound insulation cotton is arranged in each set of sound absorption holes, the ends, away from the storage cavity, of the multiple sets of wave sound insulation cotton communicate with a set of noise reduction cavities, and noise reduction cotton is arranged in the noise reduction cavities. According to the embodiment of the invention, noise is reduced, so that the harm to a human body is reduced while the noise reduction effect is improved.

This invention relates to a low-noise optical module three-temperature testing device, comprising a test box with a test cavity formed inside. An air inlet pipe is connected to the test box and communicates with the test cavity. A first silencing cavity is also formed inside the test box, and a first exhaust channel communicating with the first silencing cavity is provided on the test box. A duct is also connected to the test box, connecting the test cavity and the first silencing cavity. By setting up the first silencing cavity and connecting it to the test cavity via the duct, this invention not only extends the gas flow path within the test box and serves to store airflow, but also significantly increases the gas flow area and the diffuse reflection area and number of reflections within the test box, thereby reducing gas velocity and noise energy, achieving noise reduction. The test cavity-duct-first silencing cavity can form a Venturi effect, resulting in better noise reduction.

The invention discloses a damping modifier, a noise-reducing damping ABS material and a preparation method of the damping modifier. The noise-reducing damping ABS material comprises the following components in parts by weight: 80-95 parts of ABS; 5-20 parts by weight of a damping modifier; and 0-3 parts by weight of a processing aid. The material provided by the invention has excellent mechanical properties, high damping coefficient and excellent silencing effect.

The utility model relates to the technical field of gaskets, in particular to a sound insulation gasket which comprises a bottom layer, an installation groove is formed in the base face of the bottom layer, a sound insulation layer is installed on the base face of the bottom layer, corrugated grooves are formed in the outer wall of the sound insulation layer, a supporting plate is installed on the outer wall of the sound insulation layer, and a diaphragm is installed on the outer wall of the supporting plate. According to the utility model, through the arrangement of the polycarbonate buffer layer, the impact on the device is better relieved, the completeness of the supporting plate is ensured, meanwhile, the sound insulation layer on the outer wall of the supporting plate is not easily influenced by the impact, the sound insulation effect of the device is ensured, and the service life of the device is prolonged. When external noise of an engine and the like is conducted to the bottom layer, sound waves are refracted and offset in the inner cavities of the corrugated grooves, the noise reduction effect is achieved, and the sound insulation effect of the device is better.

This application relates to an anti-backflow control device, comprising: a valve body with a through channel inside; a valve seat fixed to one end of the valve body and having its inner cavity connected to the internal channel of the valve body, wherein one end of the inner cavity of the valve seat is formed with a valve port; a valve sleeve disposed inside the valve body and coaxially fixedly connected to the valve body, wherein a fixed sleeve is provided at the center of the valve sleeve and extends away from the valve port; a guide sleeve, one end of which is fixed inside the fixed sleeve and the other end of which extends towards the valve port; a guide sleeve, one end of which is fixed inside the fixed sleeve and the other end of which extends towards the valve port; and a valve core assembly that slides with the guide sleeve, wherein the valve core assembly is configured to cooperate with the valve port. This invention enables the valve sleeve to be coaxially connected to the valve body, and the fixed sleeve guides the movement of the valve core assembly, thereby avoiding valve core jamming and leakage during valve closure due to concentricity differences, which improves the valve's response flexibility and extends its service life.

The utility model discloses an anti-oxidation stainless steel pipe which comprises a stainless steel pipe body, a waterproof layer is arranged on the outer surface of the stainless steel pipe body, a first wear-resisting layer is arranged on the outer surface of the waterproof layer, an anti-oxidation layer is arranged on the surface of the first wear-resisting layer, and a plurality of reinforcing ribs are arranged on the inner surface of the stainless steel pipe body. A plurality of reinforcing ribs are arranged in the stainless steel pipe body, a sound insulation layer is arranged on the outer surfaces of the reinforcing ribs, a sound absorption layer is arranged on the outer surface of the sound insulation layer, and a high-temperature-resistant layer is arranged in the stainless steel pipe body. An anti-oxidation coating for the anti-oxidation layer is formed by finely processing an ultramicro inorganic metal oxide high-temperature solution and has certain heat insulation, anti-oxidation and anti-corrosion protection effects, holes formed in the surface of the sound absorption layer can collide with noise, sound energy is converted into heat energy, the noise reduction effect can be achieved, the sound insulation layer is made of sound insulation cotton, and the sound insulation layer is made of sound insulation cotton. And a good heat insulation effect is achieved.

The utility model discloses an air inlet noise reduction structure, and particularly relates to the technical field of noise reduction structures, the air inlet noise reduction structure comprises a noise reduction pipeline, one end of the noise reduction pipeline is fixedly connected with a fan pipeline, one end of the fan pipeline is fixedly connected with an air inlet pipeline, an exhaust fan is installed in the fan pipeline, and a noise reduction mechanism is arranged between the noise reduction pipeline and the air inlet pipeline. The noise reduction mechanism is arranged, the noise reduction pipeline is used for sound insulation and noise reduction at the air outlet, the rubber gasket and the protective sleeve on the outer side of the noise reduction pipeline are used for reducing vibration of the whole air inlet caused by rapid circulation of air flow and working of the exhaust fan, and therefore the noise reduction effect is achieved, and meanwhile sound insulation and noise reduction are achieved through the sound insulation gasket. Part of noise is collided and counteracted through the left silencing plate and the right silencing plate, the noise reduction effect is further improved, noise and vibration generated during equipment operation are reduced, abrasion and damage of the equipment are reduced, and therefore the service life of the equipment is prolonged, and the working environment of workers is improved.

The utility model relates to the technical field of vibration and noise reduction devices for wind driven generators, in particular to a vibration and noise reduction device for a wind driven generator, which comprises a base, a support rod is fixedly connected to the top surface of the base, a shell is fixedly connected to the top of the support rod, and a connecting rod is slidably connected to the top of the shell. Compared with the prior art, the noise reduction generator has the advantages that the generator body is fixed in the noise reduction shell, the noise reduction shell can wrap the generator body, the good noise reduction effect can be achieved, vibration generated by the generator body can be further reduced through damping of the spring damper, the noise reduction effect can be better through the double noise reduction mode, and the noise reduction effect is better. The rolling rods are arranged between the side faces of the linkage plates and the inner wall of the shell, sliding friction between the linkage plates and the inner wall of the shell can be changed into sliding friction, noise caused by sliding friction can be prevented, abrasion between the linkage plates and the shell can be prevented, and the service life of the damping and noise reduction device can be prolonged.