82results about How to "Achieve the purpose of silence" patented technology

The invention discloses an expansive type silencer and a fresh air system and relates to the technical field of indoor ventilating and exhausting equipment. The expansive type silencer and the fresh air system are invented for solving the problem that an existing expansive type silencer cannot be used for achieving broadband sound eliminating. The expansive type silencer comprises an expansion pipe. Connecting nozzles are arranged at the two ends of the expansion pipe. The area of the sections of the connecting nozzles is smaller than the area of the section of the expansion pipe. The expansion pipe comprises a fixed pipe section and a telescopic pipe section. The end, close to the fixed pipe section, of the telescopic pipe section is matched and connected with the fixed pipe section in a sleeving manner and can slide in the length direction of the fixed pipe section to adjust the length of the expansion pipe. The expansive type silencer is used for the fresh air system.

The invention relates to the field of mufflers, and particularly provides a three-layer series micro-perforated pipe muffler which comprises a muffler body, an intake end and an exhaust end. The muffler body is of a three-layer micro-perforated pipe structure for muffling, aperture ranges from 0.1mm to 0.5mm, porosity is less than 5%, gaps are formed between three-layer micro-perforated pipes without being filled with filling materials, the three-layer micro-perforated pipes are different in aperture, equal in porosity and different in cavity volume, and noise in different frequency bands is eliminated. When the muffler is at work, airflow directly flows through a pipeline, and back pressure loss is low. The exhaust muffler is simple in structure, convenient to process and low in cost, and is resistant to high temperature, corrosion and airflow impact and long in service life as being of a pure-metal structure. The muffler has good muffling effect in the whole spectral range and particularly in high-frequency band, and muffling volume reaches 15-25dB.

The invention provides a noise reducing device, a manufacturing method thereof and a freezer and solves the problem of poor noise reducing effects in the prior art. According to the technical scheme, the noise reducing device comprises a tubular body, both ends of the tubular body are provided with necked openings, one of the necked opening is connected with a refrigerant inlet pipe, and the other necked opening is connected with a refrigerant outlet pipe; the inside of the tubular body is provided with at least one taper cap, the taper cap is provided with a plurality of silencing holes and at least two liquid separating holes. The invention also provides the manufacturing method of the noise reducing device and the freezer comprising the noise reducing device. The noise reducing device can fully release the pressure of jet flow of capillary pipes, diverse the jet flow through the taper cap to achieve gas-liquid separation, filter sound waves through the round holes in the taper cap, achieve reflection and attenuation of sound waves within a certain frequency band in a first chamber and a second chamber to effectively reduce noise, solve the problem of noise emission of the freezer system of a refrigerator and improve the auditory feeling of users.

Disclosed is an inorganic heat-storage, energy-saving and temperature-regulating wall material. The technical scheme includes that a certain quantity of high alumina cement, vitreous beads, aluminum silicate powder, bentonite, redispersible polymer powder, hydroxypropyl methyl cellulose, polypropylene fibers, starch ether 6200, gray calcium powder, water repellent or waterproofing agent, air-entraining agent and asbestos wool are mixed, and are sufficiently mixed in a cyclone separation manner and packaged to form a finished product. When heated (by heat sources such as sunlight and the like), the low-carbon heat-storage, energy-saving and automatic temperature-regulating wall material becomes liquid when reaching saturated temperature, and heat energy is stored; and when external temperature is lower than set temperature, the heat-storage material begins to release heat, after the heat is released thoroughly, the phase-change material becomes solid from the liquid, and the process runs in circle. The inorganic heat-storage, energy-saving and temperature-regulating wall material can be made into a section, a plate, mortar and a perforated brick, can absorb sound wave, is elastic, and vibrates, rebounds and reversely absorbs under sound wave impact, frequencies of the material are different, structural vibration is relieved, and the purpose of eliminating noise is achieved.

The invention discloses a silencer for an air conditioner and the air conditioner with the same. The silencer comprises a first silencing cavity, an air inlet pipe, a second silencing cavity, an air outlet pipe and sound absorption materials, wherein opposite side walls of the first silencing cavity are provided with a first port and a second port, the air inlet pipe is inserted into the first silencing cavity through the first port and is of a semi-closed structure, the second silencing cavity is arranged on the first silencing cavity, one end of the air outlet pipe extends into the first silencing cavity through the second port while the other end of the air outlet pipe penetrates through the second silencing cavity, the pipe body of the air outlet pipe located on the second silencing cavity is provided with a plurality of second through holes, and a cavity defined by the outer wall of the air outlet pipe and the inner wall of the second silencing cavity is filled with the sound absorption materials. The silencer for the air conditioner is an impedance compound silencer, and has the advantages of being wider in silencing frequency band and higher in silencing amount.

The invention discloses an environment-friendly automobile silencer filter which is characterized by comprising a silencer manifold and an inner silencing and filtering core arranged in the silencer manifold, wherein an intake pipe is arranged at one end of the silencer manifold, and an exhaust pipe is arranged at the other end of the silencer manifold; an air intake chamber and an exhaust chamber, which are mutually isolated, are arranged in the silencer manifold; the air intake chamber is connected with the intake pipe and is communicated with the intake pipe; the exhaust chamber is connected with the exhaust pipe and is communicated with the exhaust pipe; the inner silencing and filtering core is tubular and is arranged in the exhaust chamber of the silencer manifold; and one end of the inner silencing and filtering core is open, the other end of the inner silencing and filtering core is sealed, and the open end of the inner silencing and filtering core is penetrated into the air intake chamber and is communicated with the air intake chamber. The invention further discloses a silencing and filtering method. The environment-friendly automobile silencer filter can be used for silencing and cleaning the exhaust tail gas to achieve an environmental protection target.

The invention relates to the technical field of silencing equipment, in particular to a safety valve silencer. The safety valve silencer comprises a silencer body, an air inlet, an air outlet, a separation board, acoustic panels and air holes, wherein the air inlet is formed in one end of the silencer body; the air outlet is formed in the other end of the silencer body; the separation board is arranged at the upper end of the silencer body; at least three acoustic panels are arranged in the silencer body; the air holes are formed in the acoustic panels. The safety valve silencer has the advantages of simple, compact and reasonable structure, high convenience and quickness for assembly and reliable connection; the aim of silencing is achieved by disturbing air current and acoustic waves of the silencer, noises are reduced, and the working reliability of the silencer is greatly improved. The safety valve silencer has the advantages of smooth internal exhaust, low power loss, good silencing effect and high simplicity in application and popularization.

The invention relates to the field of diesel generators, in particular to a soundproof outer cover of a mute generator set. The soundproof outer cover comprises a soundproof outer cover body arrangedoutside the generator set in a covering mode. The soundproof outer cover body is of a double-layer structure composed of an inner layer plate and an outer layer plate, thus a closed cavity is formed between the inner layer plate and the outer layer plate, the cavity is vacuumized to improve the soundproof effect of the soundproof outer cover, meanwhile, a sound-attenuation material layer is arranged on the face, facing the generator set, of the inner layer plate, part of noise from the generator set is absorbed through the sound-attenuation material layer, noise absorbing of the sound-attenuation material layer is matched with sound insulation of a vacuum layer, thus the noise of the generator set is greatly lowered, and the mute purpose is achieved .

The invention discloses a noise reduction type air outlet hood for an extractor hood. The noise reduction type air outlet hood comprises a base and a hood body on the base and is characterized in thatthe hood body comprises an inner hood and an outer hood, the peripheral wall of the inner hood is provided with multiple noise reduction holes and the inner hood and the outer hood form multiple noise reduction cavities corresponding to the noise reduction holes. The peripheral wall of the inner hood is provided with the multiple noise reduction holes, the inner hood and the outer hood form multiple noise reduction cavities corresponding to the noise reduction holes, air columns in the noise reduction holes and air in the noise reduction cavities form an elastic resonance system, when a partof the noise frequency of the extractor hood is the same to the inherent frequency of the resonance system, the air columns in the noise reduction holes produce resonance and violent friction with thehole walls and through the friction, the acoustic energy is converted into heat energy so that the noise elimination is realized. The noise reduction type air outlet hood has good noise reduction andelimination effects based on the Helmholtz resonance sound elimination principle. According to the diversion form of the air outlet hood, the noise reduction effects on all parts of the air outlet hood are optimal.

The invention discloses an engine waste gas cycle purifying and silencing system. The engine waste gas cycle purifying and silencing system comprises a body which is internally provided with a cavity and vertically placed. An air inlet pipe is arranged on the side wall of the body. An exhaust pipe is arranged on the top of the body. A first partition plate and a second partition plate are connected to the inner wall of the cavity. The first partition plate is located above an air inlet and arranged horizontally. The second partition plate is connected to the tail end of the first partition plate and arranged vertically. A plurality of vertically arranged electrode plates are arranged between the side, close to the air inlet, of the second partition plate and the inner wall of the cavity. A plurality of vertically arranged dust collection plates are arranged between the side, away from the air inlet, of the second partition plate and the inner wall of the cavity. The inner wall of the cavity is provided with a horizontally arranged discharge electrode, and the discharge electrode is located above the first partition plate. An electrostatic generator is arranged outside the body and connected with the electrode plates, the dust collection plates and the discharge electrode. The engine waste gas cycle purifying and silencing system is simple in structure and convenient to operate, and the dust removal and purification effects are greatly improved while the silencing effect is ensured.

The invention relates to the technical field of noise reduction of an air conditioner, and particularly discloses a noise elimination and sound insulation device for an outdoor unit of an air conditioner. The noise elimination and sound insulation device for the outdoor unit of the air conditioner comprises a cover body covering the outdoor unit of the air conditioner, wherein an air inlet and anair outlet are arranged on the cover body, the air inlet is far away from the air outlet, and the air inlet is lower than the air outlet; a first space and a second space which are used for separatingthe space around the outdoor unit of the air conditioner are arranged in the cover body, the air inlet end of the first space communicates with the air inlet of the cover body, and the air outlet endof the first space communicates with the air inlet end of an air inlet grille of the outdoor unit of the air conditioner; the air inlet end of the second space communicates with the air outlet end ofa cooling fan of the outdoor unit of the air conditioner, and the air outlet end of the second space communicates with the air outlet of the cover body; and an air inlet silencing assembly is arranged in the first space, and an air outlet silencing assembly is arranged in the second space. The scheme provided by the invention is used for solving the problems that in the prior art, the quality ofa sound environment where people live is reduced due to noise pollution caused by the operation of an outdoor unit of an air conditioner, and the normal sleep and rest of the people are seriously affected.

The invention discloses a method capable of reducing biogenic amine in a fermented sausage and application thereof. The method comprises the following steps that 1, according to sequences of amine production-correlated genes luxR of main amine production bacteria enterobacter aerogenes and enterobacter cloacae in the fermented sausage, small-interfering ribonucleic acid (siRNA) is designed and prepared; 2, the siRNA is used as an encapsulated matter for preparing lipidosome, so that the stable siRNA cationic liposome is obtained; 3, the siRNA cationic liposome is added into the fermented sausage according to a certain ratio in a fermentation early stage. According to the method, the flavor, color and lustre of the fermented sausage are not affected, and the effect of inhibiting the biogenic amine is significant, so that the method has important significance in controlling the biogenic amine in the fermented sausage.

The invention discloses a modified IXPE anti-skid and silent PVC sheet floor and a production process thereof. The modified IXPE anti-skid and silent PVC sheet floor comprises an SPC substrate layer,the upper end of the SPC substrate layer is provided with a PVC decorative paper layer, the upper end of the PVC decorative paper layer is provided with a wear-resistant layer, the bottom of the SPC substrate layer is provided with an IXPE silent layer, the bottom of the IXPE silent layer is coated with anti-skid glue, an inner cavity of the SPC substrate layer is provided with a sound-proof cavity, the sound-proof cavity is internally provided with a sound insulation device, and the side surface of the SPC substrate layer is provided with a connecting pin. The IXPE silent layer is arranged, vibration and noise generated by the floor can be absorbed, and the silent aim is achieved; the bottom of the IXPE silent layer is coated with the anti-skid glue, the floor only needs to be stably placed during installation, and glue coating and backing film pasting are avoided, so that a product is capable of achieving the general anti-slip film back pasting effect, the slotting link for facilitating installation of the product is omitted, and installation is facilitated; and the sound-proof cavity is arranged, the sound insulation device is arranged, and therefore the aims of sound insulationand silencing are achieved.

A door stopper with a buffering function comprises a base, a tension spring, a rotary disc, a first anti-collision strip, a second anti-collision strip and a positioning disc. The door stopper with the buffering function is characterized in that a pressing disc is arranged on the base, and public base through holes are formed in the base and the pressing disc; a rotatable center column is arrangedin the center of the base, a base spring positioning column is arranged beside the center of the base, the center column and the rotary disc are fixed together, and the rotary disc is limited betweenthe base and the pressing disc; the two ends of the tension spring are respectively fixed on a rotary disc positioning column and the base spring positioning column; the rotary disc can rotate properly under the limitation of the tension spring; a rotary disc head is arranged at the upper end of the center column, and the first anti-collision strip, first magnetic steel, second magnetic steel anda first alignment line are arranged on the rotary disc head; a stand column is arranged on the positioning disc, and a positioning hole is formed in the positioning disc; and the stand column is provided with a platform, and the platform is provided with the second anti-collision strip, third magnetic steel, fourth magnetic steel and a second alignment line. According to the door stopper with thebuffering function, when a door leaf touches the door stopper, buffering can be achieved, and the purpose of silence is achieved.

A CPU radiator for computer mainframe relates to computer technology field. It contains radiation fin and touch panel for conducting heat by contacting CPU. Structural feature is said touch panel being copper plate with heat tube s, each heat tube another end interpenetration in a row of radiation fins which are abutted against to power supply fan. Compared with current technology, the present invention has low noises, fast heat radiation, and noise without undulation along with systems operation program and environmental temperature variation.

The invention relates to the technical field of silencing equipment, particularly to a muffler. The muffler comprises a muffler body, an air inlet, an air outlet, a silencing silk screen, a main pipe, an air outlet pipe and an assistant cavity, wherein the air inlet is formed in one end of the muffler body, and the air outlet is formed in the other end of the muffler body; the silencing silk screen is arranged between the outer wall and the inner wall of the muffler body; the air inlet is connected with the main pipe; the main pipe is connected with the assistant cavity through the air outlet pipe. The novel muffler is simple, compact and reasonable in structure, convenient and quick to assemble, and reliable in connection, the purpose of silencing is realized by changing the direction of air flow, the noise is reduced, air inlet and exhaust in the muffler are smooth, the power consumption is small, the silencing effect is good, the operation reliability of the muffler is greatly improved, and the muffler is easy to use and popularize.

The invention discloses a silent steering wheel which comprises a first steering shaft, a steering shaft sleeve, a first gear, a second gear, a second steering shaft, a third gear, a turbine; whereinthe lower part of the first steering shaft is provided with straight teeth, one side of the steering shaft sleeve extends outwards to form a containing opening; the first gear is fixedly arranged on the first steering shaft and located in the steering shaft sleeve; the second gear is arranged in the accommodating opening and is rotationally connected with the accommodating opening; the second gearis meshed with the first gear; the second steering shaft is arranged on one side of the first steering shaft, and the second steering shaft is connected with a steering transmission mechanism; the third gear is fixedly arranged on the second steering shaft and is meshed with the second gear; the turbine is arranged on the lower portion of the first steering shaft and meshed with the straight teeth to drive the motor, and the power output end of the turbine is connected with the turbine. The steering wheel can be combined with and separated from an automobile transmission mechanism, and the purpose of silence of the steering wheel is achieved. The invention further provides a control method of the silent steering wheel.