68results about How to "Improved noise reduction effect" patented technology

The invention relates to a high-temperature resistant low-noise drain pipe which consists of an inner layer, a middle layer and an outer layer, the inner layer and the outer layer consist of 50-90% of polypropylene random copolymer, 9-45% of calcium carbonate and 1-5% of masterbatch, the middle layer is made of polymer filling materials, and the main components comprise 20-80% of polypropylene block copolymer, 20-80% of silicon dioxide (or calcium carbonate), 0.3-2% of lubricant and 0.5-5% of masterbatch. The drain pipe can be used under a high temperature environment at about 90 DEG C for a long time, the surfaces of the inner layer and the outer layer are very smooth, the calcium carbonate is added in the middle layer for playing the role of absorbing sound, thereby effectively reducing the noise when being passed by water flow; furthermore, the raw materials do not contain lead, barium and other harmful substances, thereby being more conductive to meeting the requirements of people on sanitation and environmental protection.

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 belongs to the acoustical technical field and relates in specific to a novel non-fiber type and micropunched sound absorption type sound barrier body with transition cavity. The invention comprises a micropunched panel, a top face, a bottom face, a left end face, a right end face and a back plate; the micropunched panel, the top face, the bottom face, the left end face, the right end face and the back plate are connected to form a closed cavity; the cavity depth appears in a linear transition; the maximum depth is 2.5 to 3.5 times as the minimum depth. The micropunched panel is arranged with micropores with total occupied area of 0.5 percent to 3 percent of the panel area; the micropore aperture is 0.6 to 1.2mm. In actual use, it is only necessary to mount the invented device into a sound barrier vertical column or other places for sound absorption process. The invented device is characterized in being simple, easy and convenient manufacturing, thin shape and being light and having perfect sound absorption performances. Sound absorption band width with sound absorption factor higher than 0.4 exceeds 2 octaves. Therefore, the invention has advantages of broad application scope, easy purging, high-temperature resistance, and superior weather ability. Besides, the invented device can be completely recycled for use to thoroughly avoid the problem of secondary pollution, for which the invention has superior environmental protection function.

The invention relates to the technical field of refrigerators, in particular to a refrigerator control method and device and a refrigerator. The control method comprises the steps of obtaining user state information of at least one user, wherein the user state information shows whether the use is in the sleeping state or not; according to the user state information of at least one user, adjusting the refrigerator running mode so as to reduce the refrigerator noise. The running mode of the refrigerator is dynamically adjusted, the relatively-quiet use environment is provided for the user, the noise of the refrigerator is reduced to the maximum limit, and therefore a customer can feel more comfortable during refrigerator use.

A power converter includes: a plurality of external terminals; a grounded earth terminal; a power conversion circuit; a ground conductor; and a plurality of inductors. A plurality of nodes of the power conversion circuit are connected to the respective plurality of external terminals. The power conversion circuit performs power conversion by switching received power. A plurality of inductors are inserted between the plurality of external terminals and the plurality of nodes. Further, another inductor is inserted between the ground conductor and the earth terminal. In this way, there can be provided a power converter that provides a sufficient noise reduction effect also in a high frequency region.

A system for dissipating sound shock waves within a vehicle tire includes a wheel upon which a tire is mounted to create an internal air chamber defined by the wheel and the tire. A flow-resistant barrier is coupled to the wheel or the tire and defines an air cavity within the internal air chamber. A porous spacer can support the barrier with respect to the tire and also can provide a flexible energy damper. The barrier comprises a material that provides an acoustical resistance to sound shock waves passing therethrough. The air cavity defined by the barrier has a volume such that air within the cavity offers relatively small impedance to the passage of shock waves through the barrier and into the air cavity. The barrier also can produce frictional heat when displaced by a shock wave, thereby converting energy of the shock wave to heat to reduce noise associated therevvith.

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.

The invention relates to a ventilator, which comprises a framework, a snail shell and a fan, wherein the framework is provided with an opening, the snail shell is arranged in the framework and is provided with a wind suction opening, the fan is arranged in the snail shell, a circuit board box is arranged on the snail shell, a silencing plate is fixedly arranged on the outer periphery of the air suction opening of the snail shell of the ventilator, the silencing plate is in a streamline structure formed by using a rotating shaft of the fan as the center through rotating a 90-degree range in the direction opposite to the rotating direction of the fan from a tongue part of the snail shell and then enlarging towards the outside from the air suction opening in the rotating shaft direction of the fan, and the silencing plate has the arc-shaped chamfer shape set to be matched with the circumference of the air suction opening. The ventilator has the advantages that the silencing plate in the streamline structure is arranged in a high static pressure region rotating for 90 degrees in the direction opposite to the rotating direction of the fan from the tongue part of the snail shell, a good noise reduction effect is realized, in addition, the position of the existing circuit board box is changed, the existing circuit board box is changed to a position at the outer side of the silencing plate, and the air flowing of the air suction opening is not blocked, so the noise is further reduced.

The invention relates to a sound-proof door structure, which comprises a door frame and a door plate, wherein an inner arc surface is arranged on the door frame, a sound-proof bar is arranged on the inner arc surface, and the door plate is provided with an outer arc surface corresponding to the inner arc surface; sealing edge bars are arranged on the top, the left side and the right side of the door plate respectively, a bottom through groove is opened in the bottom part of the door plate, the bottom through groove is internally provided with a horizontally-arranged horizontal rod, a lifting mechanism and a sound absorption bar, the lifting mechanism is located below the horizontal rod, the inner wall of the bottom through groove is symmetrically provided with pull springs connected with the lifting mechanism, and the sound absorption bar is fixed on the bottom part of the lifting mechanism; and one end, close to a hinge, of the horizontal rod is provided with a groove and the other end is provided with a nose, the nose of the horizontal rod reaches out from the side wall of the door plate, the inner wall of the bottom through groove is vertically provided with a positioning rod matched with the groove, the top end of the positioning rod is placed in the groove of the horizontal rod, and the outer wall of the positioning rod is sleeved with a positioning spring matched with thegroove. The sound-proof door is easy to process, easy to manufacture, good in sound-proof performance and obvious in noise reduction.

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 invention discloses an anti-explosion fan capable of effectively reducing noise. The anti-explosion fan capable of effectively reducing the noise comprises a shell, an anti-explosion fan body is installed inside the shell, a frame body is installed on the outer side edge of the anti-explosion fan body, fixing frames are symmetrically installed inside the frame body, the anti-explosion fan bodyis located between the fixing frames, a first movable plate is installed at the bottom of the frame body, a plurality of first springs are evenly installed at the bottom of the first movable plate, asupporting base is installed at the bottoms of the first springs, the bottom of the supporting base is fixedly connected with the bottom end of the interior of the shell, a second movable plate is installed at the top of the frame body, a plurality of second springs are evenly installed at the top of the second movable plate, a fixed plate is installed at the tops of the second springs, the top of the fixed plate is fixedly connected with the top end of the interior of the shell, and a fan cover is installed on one side edge of the anti-explosion fan body.

The present invention provides an automatic transmission. In the automatic transmission which comprises a plurality of speed changing units comprising planetary gear mechanisms, the cost can be reduced based on the reduction of the number of components. Furthermore, a noise reduction effect based on engagement sound can be obtained. In the transmission (M), the engagement parts (H1, H2) of the planetary gear mechanisms (P1, P2) are accommodated in a gear chamber (19) which is composed of the following components: pushing components (75, 175) of clutches (70, 170) which are spaced from each other in the axial direction, outer shafts (45b, 146) of two planetary gear carriers (40, 140) and the outer component (T) of unidirectional clutches (80, 180), which form a peripheral wall that extendsin the axial direction. The gear side wall (54) of the pushing component (75) and an annular gear (50) and the gear side wall (133) of the pushing component (175) and a central gear (130) respectively form a double-layer wall in an axial range comprising two engagement parts (H1, H2) when observed from the axial direction.

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.

The invention discloses a welding fixture having noise reduction and dust collection functions and used for automobile production machining. The welding fixture comprises a base, slide devices, clamping plates, a snap ring device, a dedusting device and a noise reduction hood; the upper side of the base is provided with the slide devices, and the slide devices are connected with the clamping plates on the upper sides through connection rods; the inner sides of the clamping plates are movably connected with the snap ring device; the dedusting device is arranged under the lower side of the snapring device and located in the base; and the noise reduction hood is fixed to the outer side of the base through a separable mode. According to the welding fixture, the bottom of the snap ring deviceis provided with the dedusting device, thus, dust generated during welding falls into a dedusting trough, then, a suction fan is driven by a motor to rotate and sucks the welding dust into a dust storage box through an air suction pipe, the dedusting purpose is achieved, and the cleanliness of the fixture is improved.

This invention relates to a denoise diamond section, which comprises basal body and diamond cutting body connecting with basal body, characterized in that the basal body has a composite structure with more than three layers, wherein the adjacent layers has different material quality, and the diamond cutting body is pressed by several kinds of metal powder and artificial diamond. The invention also provides the method for manufacturing said denoise diamond section.

The invention belongs to the technical field of building materials, and particularly relates to a noise-reduction heat-insulation wall material, a preparation method thereof, a noise-reduction heat-insulation building block and a manufacturing method thereof. The method comprises the following steps: 1) preparing raw materials; 2) mixing aggregates, graphene oxide, cement and silica fume to obtaina mixture A; 3) successively adding a water reducing agent, a binder, an activating agent and water of which the mass is 30-40% of the mass of the cement in the mixture A, and stirring and mixing toobtain mixed slurry B; 4) processing crop straws into a straw frame; 5) pouring the mixed slurry B in a mold and carrying out pouring, placing the straw frame obtained in step 4) in the mold in the pouring process, demolding and then maintaining to obtain the final product. Main raw materials of the noise-reduction heat-insulation wall material are construction wastes, the problem that the construction wastes are difficult to treat is solved, and resourceful utilization of wastes is realized. By gap structures between the straws and the aggregates, a sound wave transmitting distance is lengthened, repeated refraction is carried out, energy of sound wave is weakened, and a noise-reduction effect is good.

A large air-volume piece type impedance composite muffler comprises a frame, side sound absorption pieces and semicircle air deflectors, the left and the right of the inside of the frame are provided with a side sound absorption piece respectively, a plurality of ventilation cavities and sound absorption pieces are arranged between the two side sound absorption pieces at intervals, the upper portion and the lower portion of the inside of the one of the ventilation cavities are provided with sound absorption piece rotating arm devices, universal wheels are arranged below the sound absorption piece of one side of the sound absorption piece rotating arm devices, and positioning blocks are riveted to the upper end and the lower end of the rest ventilation cavities through rivets. The large air-volume piece type impedance composite muffler is reasonable in structure, significant in noise-reduction effect and wide in sound absorption frequency band, and reduces environmental pollution. The large air-volume piece type impedance composite muffler is applicable to ventilation facilities of underground railways and highway tunnels.

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.

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 invention discloses a prestressed concrete three-web trough girder. The trough girder at least comprises a base plate, two side webs and an intermediate web; the side webs are respectively arranged on both sides of the base plate, and the intermediate web is arranged between the side webs, the base plate is arranged at the bottom of the side webs and the intermediate web, and the side webs andthe intermediate web are fixedly connected with the base plate respectively. The prestressed concrete three-web trough girder is characterized by low building height and good noise reduction effect;has the advantages of thin base plate of a single-line trough girder and big applicable span of double-line trough girders, high utilization rate of section space, lower total cost, wide serviceability and attractive appearance.

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.

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.