66results about How to "Improved noise reduction effect" patented technology

A noise control device reduces a noise coming to a plurality of spaces acoustically independent from one another. The noise control device includes: sound output means for outputting a sound into the corresponding space; noise detection means arranged in at least one of the spaces for detecting a noise coming into the space; and signal generation means for generating a cancel signal for canceling the noise according to the noise detected in one of the noise detection means and outputting the generated cancel signal to the plurality of sound output means.

The invention discloses a bidirectional air intake tower type air purifier structure. The bidirectional air intake tower type air purifier structure comprises a housing, an air flue and a combined filter screen, wherein the air flue is arranged inside the housing; a base is fixedly connected at the lower opening of the housing, and an ejecting member is arranged at the upper opening of the housing; both sides of the housing are provided with handle arranging holes, the main body of a handle unit is larger than the corresponding arranging hole, and the recesses of the handle units extend into the housing through the corresponding arranging holes and connected with the ejecting member through screws; the air flue is arranged between the ejecting member and the base, the base supports the bottom of the air flue, and the ejecting member presses the top of the air flue. The bidirectional air intake tower type air purifier structure is easy and convenient to assemble, high in production efficiency, large in air filtering area and beneficial to improving the air filter amount of the combined filter screen, thereby prolonging the service life of the combined filter mesh. The bidirectional air intake tower type air purifier structure can improve the CADR (clean air delivery rate).

The invention discloses a low-noise submarine. The low-noise submarine comprises a submarine body and is characterized by further comprising a silencing housing, wherein the silencing housing is arranged on the outer wall of the submarine body; a silencing gap exists between the submarine body and the silencing housing; and the silencing gap is a liquid storage gap or a liquid flowing gap. As the silencing housing is additionally arranged on the outer wall of the submarine body of the submarine, the liquid is stored in or flows through the silencing gap between the silencing housing and the submarine body so that a silencing layer is formed between the outer wall of the submarine body (in operation) and seawater; therefore, the integral silencing effect of the submarine is realized and the noise reducing effect is obviously improved. And moreover, the invention is advantaged in that the low-noise submarine is simply structured and simple to implement; the sound insulating effect of the low-noise submarine is extremely perfect by using seawater as a sound insulating material; and the submarine can be in the seawater during operation so that the seawater is easy to collect and zero cost is realized.

The invention relates to a dust collector multi-grade noise reduction device, which comprises an electric blower fan and a dust collector base for supporting the electric blower fan, wherein, the peripheral area of the electric blower fan is provided with an inner cover and an outer cover of the electric blower fan which are arranged at intervals; a resonant chamber separated and a closed expansion chamber arranged between the inner cover and the outer cover by a shrinkage pipe bracket; the shrinkage pipe bracket is provided with a shrinkage pipeline connecting an air inlet and an air outlet. The shrinkage pipe brackets connecting the inner cover and the outer cover can be one or more than one. The shrinkage pipeline arranged on the shrinkage pipe bracket can be small holes with various shapes and with a cross section which is vertical to the shrinkage pipe bracket. The dust collector multi-grade noise reduction device has the advantages of compact structure, coaxial arrangement of the electric blower fan as well as the inner cover and the outer cover of the electric blower fan, small occupation area and small volume, which can weaken sound wave produced by the electric blower fan by a plurality of times of expansion and shrinkage of the resonant chamber, the expansion chamber and the shrinkage pipe at the transilient interface part again and again, thus having an obvious noise reduction effect.

A noise-reducing structure of vacuum cleaner is composed of the front casing for the front part of fan / motor unit, the back casing for the back part of fan / motor unit, and exhaust unit with filter. Said back casing has a through hole and several guide ribs playing the role of obstacle to make said through hole be opened partly. Its exhaust channel is elongated for attenuating the noise.

A Roots blower, belonging to the technology field of blowers, comprises a motor, an impeller box, and a gear box. A muffler is connected with the air inlet port of the impeller box, an oil scale base is arranged on the wall body of the gear box, an oil scale hole of the oil scale base communicates with an oil chamber of the gear box, and an oil scale is arranged on the oil scale base and extended into the oil scale hole and contacts with the oil chamber. The inventive Roots blower has ideal noise reduction effect due to the arrangement of the muffler. The oil scale is extended into the oil scale hole arranged on the oil scale base and contacts with the oil chamber of the gear box, so that the oil scale can not be damaged and needs not to be repaired and replaced, and the oil scale can be conveniently taken out periodically or aperiodically to observe the oil conditions inside the oil chamber of the gear box.

The present invention relates to a disc and hub assembly for an electromagnetic clutch of a compressor. The assembly comprises: a disc adapted to be attracted to or separated from a friction surface of a pulley under the action of an electromagnetic coil; a hub coupled to a driving shaft of the compressor, the hub penetrating the disc and having a flange formed on its outer peripheral surface; a plate spring which includes a plate portion coupled to the top surface of the disc, a number of leaf spring portions obliquely extending inwardly from the plate portion to be coupled to the flange of the hub and having ends which are bent toward the disc, and dampers coupled to the ends of the leaf spring portions; and shock-absorbing means interposed between the disc and the plate portion to reduce noise and impact during on / off of the clutch.

The invention relates to complex titanium and calcium sulfonate lubricating grease and a preparation method thereof. The complex titanium and calcium sulfonate lubricating grease comprises the following components in percentage by weight: 70-80 percent of base oil, 17-24 percent of a complex titanium and calcium sulfonate soap thickener, 2-4 parts of a high-temperature thermal-stability improving agent and 1-2 percent of an antioxidant. By introducing a solvent and the base oil in the preparation method, an reaction interface is added, the reaction rate and the extent of reaction are improved, the preparation time is greatly shortened, the thickening capability of complex titanium and calcium sulfonate soap is improved, and at the same time the composite production process is optimized. The product quality is good in stability. The complex titanium and calcium sulfonate lubricating grease has a good extreme pressure anti-wear property and long lubrication life, can be used for a long term at a high temperature of 200 DEG C, and also has a good effect of reducing noises.

The invention belongs to the technical field of environmental protection equipment and provides a sound-absorbing environment-friendly absorption tank for chemical equipment. The absorption tank comprises a tank body, an upper partition plate and a lower partition plate are arranged in the tank body and divide the internal cavity of the tank body into an absorption room, a noise reduction room and a cooling room, the upper partition plate and the lower partition plate are provided with a plurality of first silencer holes, the bottom of the tank body is provided with an air inlet pipe, a liquid inlet pipe and a liquid outlet pipe, the air inlet pipe, the liquid inlet pipe and the liquid outlet pipe are provided with solenoid valves, the top end of the tank body is provided with an exhaust pipe, the inner wall of the tank body is provided with a liquid level sensor, an absorption liquid is stored in the absorption room, at least two silencer pipes are arranged in the noise reduction room, two ends of each one of the silencer pipes respectively pass through the upper partition plate and the lower partition plate, the silencer pipes in the noise reduction room are provided with multiple second silencer holes and a heat exchange pipe is arranged in the cooling room. The absorption tank reduces noise pollution in exhaust gas transmission, improves noise reduction effects, realizes energy-saving and environmental protection treatment on waste dust and exhaust gas, is efficient and convenient in use and has strong practicability.

A display panel drive device for applying a drive pulse to data lines of a display panel according to a video signal includes a latch portion and an output amplifier. The latch portion includes a first latch section, a delay circuit, and a second latch section. The first latch section is provided for capturing the pixel data pieces or retaining the pixel data pieces. The delay circuit is provided for generating a delayed load clock signal. The second latch section is provided for capturing the pixel data pieces or retaining the pixel data pieces. The delayed load clock signal is transited to the first level state after a first delay time, and the delayed load clock signal is transited to the second level state after a second delay time shorter than the first delay time.

The invention relates to the technical field of glass curtain walls. The aim is to provides a heat-preservation and energy-saving glass curtain wall with high heat-preservation and heat-insulation performances. The heat-preservation and energy-saving glass curtain wall comprises a plurality of square curtain wall units. The curtain wall units are installed on a keel frame of a building outer wallin a matrix shape. Each curtain wall unit comprises a square glass plate, and each glass plate comprises a square supporting frame, outer-layer glass and inner-layer glass, wherein the outer-layer glass and the inner-layer glass are installed on the inner side and the outer side of the supporting frame. A heat-insulation and noise-reduction cavity is formed among the supporting frame, the inner surfaces of the outer-layer glass and the inner-layer glass. At least one layer of thin film matched with the heat-insulation and noise-reduction cavity is further arranged in the supporting frame, andthe thin film divides the heat-insulation and noise-reduction cavity into multiple layers of cavities which are distributed in the thickness direction of the heat-insulation and noise-reduction cavityand are independent of one another. According to the heat-preservation and energy-saving glass curtain wall, the heat-preservation and noise-reduction performances of curtain wall unit glass plates can be greatly improved, the traditional mode of additionally arranging multiple layers of glass is abandoned, and the weight is lighter.

A pneumatic radial tire for car capable of effectively lowering road noise by specifying the material characteristics and structure of a belt cover layer formed of aromatic polyamide fiber cords, wherein the belt cover layer formed of the aromatic polyamide fiber cords is disposed on the outer peripheral side of a belt layer and the aromatic polyamide fiber cords are disposed around the tire at an angle of substantially 0 DEG relative to the circumferential direction of the tire, characterized in that the intermediate elongation of the aromatic polyamide fiber cords at a load of 67N is 2.0 to 2.7% and the placing density of the aromatic polyamide fiber cords in the belt cover layer is 36 to 54 pieces / 50 mm.

The invention relates to a range hood. The range hood comprises a range hood body and an active noise reduction structure; the active noise reduction structure comprises a loudspeaker assembly, a controller and a plurality of microphones; the controller is electrically connected with the microphones and the loudspeaker assembly; the loudspeaker assembly is arranged in a shell and located below anair inlet of a draught fan of the range hood body; and the microphones are arranged in the shell, distributed in an array mode and surround the periphery of the draught fan. The microphones are arranged in the shell and surround the periphery of the draught fan in an array distribution mode, and the loudspeaker assembly is distributed below the draught fan, so that an arrangement mode that an existing active noise reduction structure is integrated in a noise elimination pipeline is changed, the oil fume extraction effect of the range hood can be improved, the noise reduction effect can be effectively improved, and global noise reduction of the range hood noise is realized.

The present invention discloses a tire tread pattern provided with a stone guard structure. The tread pattern is composed of annular grooves consecutive in the circumferential direction and pattern blocks. The annular grooves are defined by inconsecutive first side ridges; the incurvate parts, relative to the first side ridges, in the annular grooves are provided with first polygonal surfaces parallel to the tread; a second side ridge and a third side ridge of each first polygonal surface respectively extend in the trench direction, to form two second polygonal surfaces, and the two second polygonal surfaces and the first polygonal surface share a vertex S; and the bottom lines of the annular grooves are in the shapes of "zigzag" in the circumferential direction. The stone discharging function is mainly reflected in two aspects: on the one hand, the first polygon surfaces parallel to the tread directly play the role of stone discharging, on the other hand, inclined surfaces on the both sides of the annular grooves play the role of stone discharging, as the angles of the inclined surfaces change, it is difficult for stones to be firmly fixed into the inclined surfaces, stones are easily discharged during the running process of tires, so that the tires are guaranteed to have a good stone guard performance.

Provided is a pneumatic tire that, by forming slits in the band-shaped sound-absorbing material, which has been bonded to the inner surface of a tire, makes it possible to relieve stress generated ina band-shaped sound-absorbing material during rolling to improve the durability of the band-shaped sound-absorbing material and promote heat dissipation from the band-shaped sound-absorbing material to improve high-speed durability. This pneumatic tire, which is provided with a tread section 1 that extends in the tire circumferential direction to form a ring shape, a pair of side wall sections 2 disposed on both sides of the tread section 1, and a pair of bead sections disposed on the inner side of said side wall sections 2 in the tire radial direction, a band-shaped sound-absorbing material 6being bonded to the inner surface of the tread section 1 along the tire circumferential direction, has a plurality of slits 7 which extend in two directions crossing each other in the band-shaped sound-absorbing material 6, and among said slits 7, the slits 7 extending in one direction extend parallel to either the tire width direction or the tire circumferential direction.

The invention discloses a pervious asphalt pavement additive, a pervious asphalt pavement, and a pervious agent preparation device, which relate to the technical field of pervious asphalt. The invention provides the pervious asphalt pavement additive, which is prepared from the components in percentage by weight: 80 percent to 90 percent of active agent, 7 percent to 15 percent of water repellent, 1 percent of dispersing agent, and 2 percent to 4 percent of micropore generating agent. The invention also provides the pervious asphalt pavement comprising the pervious asphalt pavement additive. The invention provides the pervious agent preparation device, which comprises a preparation body, a heating workpiece, a stirring component, a detecting component, a raw material metering pump component and a fan. The pervious asphalt pavement additive and the pervious asphalt pavement provided by the invention have good effects of reducing water mist and reducing noise. Meanwhile, the strength is favorable, so that the service life of the product can be prolonged. The pervious agent preparation device provided by the invention is simple in structure and convenient to use. Meanwhile, a stirring effect is good, and reaction among the raw materials can be effectively accelerated.