72results about How to "Lower the decibel" patented technology

A non-elastic thermoplastic film having a noise abatement region and a fastening component. The noise abatement region has a plurality of apertures, wherein each of the plurality of apertures has an area of between about 4 mm2 to about 75 mm2. The fastening component is disposed within the noise abatement region such that the fastening component is surrounded by the noise abatement elements.

The invention provides a device for monitoring the alarm sound of other motor vehicles in the cab of a motor vehicle. The device mainly comprises sound collectors, a signal processing unit, an alarm display screen and a voice alarm loudspeaker. Based on the characteristics that the alarm sound signal of a vehicle has fixed spectral range on the frequency domain and is periodic on the time domain, the method comprising the steps of filtering the signal and further carrying out the related detection can effectively judge whether the signal is generated from the alarm sound of the vehicle and judge the direction of the sound source of the alarm sound by two or more than two sound collectors 1 mounted at the periphery of the vehicle; and a driver can be given an alarm by the alarm display screen 9 and the voice alarm loudspeaker 3, so that the driver can learn about the driving direction of other vehicles under the circumstance that the window of the vehicle is closed, the noise from the vehicle per se or the ambient noise is very loud, or the alarm sound of other vehicles is small. Accordingly, the device of the invention can prevent traffic accidents, reduce the noise of the loudspeaker and further reduce the noise pollution at the same time.

A non-elastic thermoplastic film having a noise abatement region and a fastening component. The noise abatement region has a plurality of apertures, wherein each of the plurality of apertures has an area of between about 4 mm2 to about 75 mm2. The fastening component is disposed within the noise abatement region such that the fastening component is surrounded by the noise abatement elements.

An improved muffler diffuser insert adapted to be used with, and mounted within, an exhaust muffler for effectively helping to reduce noise and back pressure attendant to engine operation. The diffuser comprises a cap end for abutting against an exhaust end of the muffler when the muffler diffuser is mounted within the muffler, which has at least one exhaust opening defined therein for cooperation with the exhaust end of the muffler so as to permit an exhaust flow from the exhaust end of the muffler to pass through. A body portion is connected to the cap end, and defines therein an elongated opening for permitting the exhaust flow from the muffler to pass through. A distal end of the body portion comprises an outermost end and two sound deflection portions positioned on either side of the outermost end for use in deflecting sound waves contained in the exhaust flow so as to enhance noise diffusion.

The invention discloses a noise reduction box-type transformer substation which comprises a bottom plate. A protection plate is fixed to one side of an upper end of the bottom plate, baffles are hinged to two sides of the protection plate, a cover plate is hinged to one side of each baffle, an adjusting mechanism is arranged on each baffle, and each adjusting mechanism corresponds to the protection plate and the cover plate. In the invention, a vibration amplitude of a machine body can be well relieved so that collision of parts in the machine body is reduced, a noise generated during operation of the machine body is favorably reduced; and meanwhile, a sound insulation material is attached to an inner portion of the equipment so that the noise can be further reduced, fan blades can rotatewhen the machine body vibrates, the fan blades can be matched with a cooling fan to enable air in the equipment to flow, a temperature of the equipment can be reduced, quality of the air in the equipment can be well guaranteed, impurities and dust are prevented from entering the equipment, workers can check, overhaul and clean the machine body conveniently, and a service life of the machine body can be prolonged.

The invention relates to the technical field of plate processing, and discloses a surface gluing device for plate machining. The surface gluing device comprises a base and four support columns, wherein the four corners of the top of the base are fixedly provided with fixing seats, through holes are formed in the tops of the fixing seats, the bottom ends of the four support columns extend to the insides of the four fixing seats, the inner top wall of each fixing seat is fixedly provided with two sliding slots, the left and right inner walls of each fixing seat are fixedly provided with two first springs, a sliding plate is fixedly mounted between the other ends of every two corresponding first springs, the top ends of the sliding plates are slidably clamped inside the sliding slots, and thebottoms of the sliding plates are fixedly provided with pulleys. The surface gluing device solves the problem that an existing plywood gluing device is uneven in gluing and coating, consequently thequality of plywood is poor after the plywood is handed over a completed project, noise generated by work affects the mental state of a worker, and high-quality gluing on plates with different thicknesses cannot be efficiently carried out.

The invention discloses thermochromic laminated glass and a processing technology thereof. A formula of the thermochromic laminated glass contains a glass substrate, a polymer intermediate layer, titanium dioxide powder, vanadium dioxide powder, a plasticizer, a coupling agent, organosilicone polymer modified polyethylene, a noise-absorbing material, iron oxide powder, copper oxide powder and nickel oxide powder, and the processing technology of the thermochromic laminated glass is further included. A thermochromic glue sheet is prepared through fusion of the polymer intermediate layer, the titanium dioxide powder, the vanadium dioxide powder, the plasticizer, the coupling agent, the organosilicone polymer modified polyethylene, the noise-absorbing material, the iron oxide powder, the copper oxide powder and the nickel oxide powder, then the thermochromic glue sheet and the glass substrate are treated through a high temperature and high pressure technology, thus the thermochromic laminated glass is prepared, the basic structure of laminated glass in the prior art is not changed, operation is easy, the thermochromic laminated glass has no harm to a human body, the high-temperature resistance and low-temperature resistance characteristics are improved to a great extent, the mechanical properties and chemical properties are improved, noise is reduced, the light transmittance of ultraviolet light and infrared light is decreased, the sleep quality of people is improved, and harm of ultraviolet rays to the human body is prevented.

The invention discloses a sound-proof and noise-reduction pillow. The pillow comprises a pillow body. A fluffy body for filtering out noise is placed in the pillow body. An audio processing device capable of emitting sound waves to offset the filtered noise is also arranged in the pillow body. According to the pillow, a combined noise reduction mechanism integrating active noise reduction and passive noise reduction is formed. The actual noise undergoes mitigation in decibels after the active noise reduction. The pillow combines the active noise reduction technology and the passive noise reduction technology in a genius and effective manner to attain a good sound-proof effect.

The invention discloses a novel intelligent indoor temperature controller comprising a device body, a signal receiver, a controller and an unmanned control assembly. A cross bar is fixedly connected with the top of the device body; and hanging rings are arranged at the two sides of the cross bar. A temperature sensor is arranged at the surface of the device body; a single-chip microcomputer is arranged inside the device body; a display screen is arranged on the surface of the device body; a loudspeaker and an integrated switch are fixedly connected to the surface of the device body; and a controller is arranged at the right side of the device body. The unmanned control assembly is fixedly connected to the left side of the device body and includes a casing, a collector, a condenser microphone and a sound level meter. According to the novel intelligent indoor temperature controller, the unmanned control assembly is arranged and the integrated switch is connected, so that electrical appliances like an air conditioner, an electric heating device and the like are controlled. The novel intelligent indoor temperature controller has advantages of simple structure and high intelligent level.

The invention relates to a perfume smelting furnace for cosmetics. The perfume smelting furnace comprises a shell, a crushing structure, a sieving structure and a smelting cavity. The top of the shellis provided with a feed inlet. The crushing structure is fixedly arranged on the portion, below the feed inlet, in the shell and comprises first supporting plates, rotating rollers and a motor. The first supporting plates are fixedly installed on the portions, located at the two sides of the feed inlet, of the inner top of the shell. The two rotating rollers are rotatably arranged between the twofirst supporting plates through bearings respectively. According to the perfume smelting furnace for the cosmetics, because a first screen, a second screen and a third screen are arranged in a support frame, small-particle perfume can sequentially pass through the first screen, the second screen and the third screen and fall to the bottom of the smelting cavity, the heating area of the perfume isincreased, and the smelting efficiency of the perfume is improved; and a sound insulation material layer is arranged in a metal material layer of the shell, so that noise can be reduced, and workersare protected from noise hazards.

The invention discloses a permanent magnet electromagnetic needle. The permanent magnet electromagnetic needle comprises a shell and an end cover; an upper positioning plate base is arranged on the top of the interior of the shell; a lower positioning plate base is arranged at the bottom of the interior of the shell; a silicon steel sheet sleeve is arranged between the upper positioning plate baseand the lower positioning plate base; a coil is arranged in the silicon steel sheet sleeve; a limiting sleeve is arranged in the coil; a rotor is arranged in the limiting sleeve; and the rotor comprises a rotor main body, a rotor upper end and a rotor lower end. By virtue of the permanent magnet electromagnetic needle, relative balance can be kept between the rotor and the magnetic field, the matching degree of the coil magnetic field and the rotor magnetic field can be improved, the efficiency problem caused by magnetic leakage is solved, sound decibel is obviously lowered, the service lifeof the whole apparatus is prolonged, and the temperature of the whole apparatus is lowered; and in addition, the electromagnetic leakage part generated by the coil is returned to the coil through thesilicon steel sheet sleeve, and the silicon steel sheet sleeve also generates a partial magnetic effect, so that the circularity of the coil magnetic field is improved, the efficiency of the whole electromagnetic coil is further improved, magnetic noise generated by magnetic leakage is lowered, the whole apparatus can reach the magnetic full strength, and the efficiency can be improved by 10%.

The invention discloses a fan blade mechanism for a garden blower and the garden blower, and relates to the field of garden tools. The fan blade mechanism comprises a hub part and fan blades, wherein the hub part can rotate around a rotating shaft; the fan blades are arranged on the hub part; each fan blade is provided with a leeward side, a windward side, a front edge, a rear edge and a top edge; each leeward side and the corresponding windward side are opposite; each front edge and the corresponding rear edge are opposite to each other; each front edge is located in the air incoming flow direction; each rear edge is located in the air flowing direction relative to the corresponding front edge; each top edge is located at the end away from the hub part; a first transition part of a curved surface which is close to the hub part from each top edge is arranged at the joint of each top edge and the corresponding front edge; the cross section of each first transition part is in an arc shape; and the radius length of the arc-shape of each first transition part ranges from 0.5 mm to 5 mm. According to the fan blade mechanism for the garden blower and the garden blower provided by the invention, noise generated when airflow is separated from vortex can be effectively reduced.

The invention discloses a noise-reducing box-type substation, which comprises a base plate, a guard plate is fixed on one side of the upper end of the base plate, both sides of the guard plate are hinged with baffle plates, and one side of the two baffle plates is hinged with a As for the cover plate, an adjustment mechanism is provided on the baffle, and the adjustment mechanism corresponds to the guard plate and the cover plate. The invention can well alleviate the vibration amplitude of the machine body, thereby reducing the collision of the internal parts of the machine body, and helping to reduce the noise generated during the operation of the machine body. It will also make the fan blades rotate, which can cooperate with the heat dissipation fan to make the air in the equipment flow, which helps to reduce the temperature of the equipment, and can also ensure the quality of the air in the equipment, preventing impurities and dust from entering the equipment, and It is convenient for the staff to inspect, overhaul and clean the body, which helps to prolong the service life of the body.