58results about How to "Reduce sound intensity" patented technology

A microelectromechanical system microphone structure including a substrate, a first device and at least one second device is provided. The first device is disposed on the substrate and including a first upper electrode and a first lower electrode disposed between the first upper electrode and the substrate. The second device is disposed on the substrate, surrounding the first device and including a second upper electrode and a second lower electrode disposed between the second upper electrode and the substrate. The second upper electrode includes a plurality of first conductive layers and first plugs. The first conductive layers are arranged in steps, and the first plug is disposed between the adjacent first conductive layers. The second lower electrode includes a plurality of second conductive layers and a plurality of second plugs. The second conductive layers are arranged in steps, and the second plug is disposed between the adjacent second conductive layers.

The invention relates to a tuning fork type quartz crystal oscillator resonant frequency measurement technology, in particular to a tuning fork type quartz crystal oscillator resonant frequency measurement method based on sound excitation and a device. The technical problem that the outside electromagnetic environment and measurement spaces easily limit measurement and accordingly enables a result to be inaccurate when inherent frequency of an existing tuning fork type quartz crystal oscillator is measured is solved. The tuning fork type quartz crystal oscillator resonant frequency measurement method based on sound excitation comprises the following steps of (a) adopting laser beams to perform excitation on the tuning fork type quartz crystal oscillator to be measured; (b) introducing a probe beam while scanning the sound wave frequency; (c) acquiring reflection light intensity change information received by one receiving face fixed at a spatial position and converting the intensity change into a corresponding electrical signal; (d) demodulating the electrical signal of reflection light and obtaining the inherent frequency of the tuning fork type quartz crystal oscillator to be measured according to a frequency response curve. By adopting the tuning fork type quartz crystal oscillator resonant frequency measurement method based on the sound excitation, electromagnetic signal interference is effectively avoided, and the probe problem in a narrow space is solved.

The invention discloses a pulse air-flow damping device in the vibration damping and damageproof technique domain, which comprises the following parts: outer case, inside component and air-flow expansion space, wherein the inside component contains transition section and injector whose exit connects the air-flow expansion space between inside component and outer case; the cross-section shape of injector is periodic plane curve structure in space along the circle direction or quadrangle, triangle and regular polygon direction to extend arrangement, which is composed of straightway, arc segment or parabolic segment or hyperbolic segment or expansion segment; forming a closed plane curve in space; stretching the section shape along the axial direction of outer case; forming hollow channel with two end opening; the outlet of condenser sprays out through transition section and forms current direction vortex, extension vortex structure in the gas flow expansion space, which turns the pulse air-flow as stable air-flow.

The invention discloses a sound-absorption and waterproof attapulgite board and a preparation method, which belong to the technical field of attapulgite. The sound-absorption and waterproof attapulgite board comprises an abrasion-resistance and waterproof layer, a rubber buffer layer, a sound absorption layer, a board body and a waterproof protection layer in sequence from top to bottom, wherein the board body is prepared by taking attapulgite as a basic material; the sound absorption layer comprises an elastic layer and sound absorption fillers; a plurality of small holes are formed in the elastic layer and are filled with the sound absorption fillers; the sound absorption fillers are prepared by taking attapulgite as a basic material; the sound absorption layer is connected with the board body by adhesive; the sound absorption layer is connected with the rubber buffer layer by adhesive. The sound-absorption and waterproof attapulgite board has comparatively good sound-absorption, sound-insulation and waterproof effects and has the comparatively good characteristics of stable performance, high strength and good weather resistance; in addition, the preparation method has the characteristics of being simple and being convenient in operation and low in manufacturing cost, so that the current market requirement is met, and the application value is comparatively good.

The invention relates to an ultrasonic treating head and relative treating system, wherein the contact area between treating head and human body is 30000-35000mm2; and the contact shape will match the body surface. The invention can supply needed ultrasonic energy, without hurting other organism.

The invention relates to a loudspeaker box cavity and a loudspeaker box. The loudspeaker box cavity and the loudspeaker box are used to solve a problem that a loudspeaker sound penetrates into a microphone area so that a process that a user sound is picked by a microphone pickup hole is severely influenced. The loudspeaker box cavity comprises a first shell and a second shell, wherein the first shell is provided with at least one first opening used for installing a loudspeaker; the first shell and the second shell are assembled together to form a first internal space; at least one closed chamber is formed in walls of the first shell and the second shell and the walls surround the first internal space; and the closed chamber is used to block a sound wave which is generated from the loudspeaker and is transmitted to a microphone installed on an outer side of the second shell or the microphone pickup hole from the loudspeaker along materials themselves of the first shell and the second shell. At least one sound insulation cavity is arranged on a shell between the first shell and the second shell of the loudspeaker box cavity so as to block a sound of the loudspeaker to be transmitted to the microphone area through the shell materials themselves so that a space nearby the microphone has a good acoustics environment.

An air exit guidance which in particular is provided for arrangement in the personal service unit of an passenger aircraft. The guidance includes an air inlet and an air outlet as well as an adjustable throttle which is arranged at the inflow side of the air exit guidance.

The invention discloses a sound-absorbing and heat-insulating building decoration material and a preparation method. The material is prepared from the following raw materials: waste paper pulp, wood sawdust, high-viscosity attapulgite clay, an adhesive, vegetable fibers, a flame retardant, light calcium carbonate and quartz powder. The preparation method comprises the steps of mixing and uniformly stirring all the ingredients separately and thoroughly so as to obtain a size mixture, then, putting the size mixture in a die, then, putting the die in a plate vulcanizing machine, carrying out hot-press forming, and then, carrying out polishing treatment on a formed product, thereby preparing the sound-absorbing and heat-insulating building decoration material. The decorating material not only has relatively good sound-absorbing and heat-insulating effects, but also has certain flame retardance; the preparation method is easy and feasible and is applicable to industrial production application.

The invention discloses an air conditioner sleep mode control method. The method comprises the steps that S1, when current time reaches preset peaceful sleep time in an air conditioner, whether parameters of the environment where the air conditioner is located meet preset conditions is judged; S2, when the preset conditions are met, the air conditioner enters a sleep mode; and S3, when the preset conditions are not met, a user is reminded that the air conditioner will enter the sleep mode within the first preset time. The invention further provides an air conditioner sleep mode control device, a storage medium and an air conditioner. The air conditioner adopting the scheme, a temperature and an air volume are properly adjusted according to the human engineering principle, the purpose of making human bodies comfortable is achieved, and energy can be saved.

The invention provides an automobile tail gas exhaust device and a method for exhausting automobile tail gas. The device comprises a connecting body (1), a multi-hole-shaped cellular shunt silencer (3), a rotational flow supercharger (9) and a shell (11), wherein the connecting body (1) is used for being connected with an automobile tail gas exhaust pipe, the multi-hole-shaped cellular shunt silencer (3) is connected with the connecting body (1) is a sealed mode, a certain space is reserved between the multi-hole-shaped cellular shunt silencer (3) and the shell (11) to form an air inlet (2), the rotational flow supercharger (9) is connected with the multi-hole-shaped cellular shunt silencer (3), a guide pipe (10) is arranged in the rotational flow supercharger (9), and the guide pipe (10) is communicated with the multi-hole-shaped cellular shunt silencer (3). According to probationary certificate, the device and method are applicable to various gasoline and diesel engine automobiles, the device is reasonable in structure and convenient to install, original performance of the automobiles is not affected, and the energy conservation and noise reduction effect is achieved.

The invention discloses a garden pavement brick, which belongs to the technical field of pavement bricks. The garden pavement brick includes a brick body, the brick body includes an anti-skid wear-resistant layer and a fixed adsorption layer, the bottom surface of the anti-skid wear-resistant layer is fixedly connected with the top surface of the fixed adsorption layer, and the top surface of the anti-skid wear-resistant layer is set There is a top surface groove, the bottom surface of the top surface groove is provided with a through hole vertically penetrating through the anti-skid wear-resistant layer, one end of the anti-skid wear-resistant layer is provided with a side groove, and the other end is provided with a protrusion matching the side groove. block; the fixed adsorption layer is provided with a water leakage hole vertically penetrating the fixed adsorption layer, and the upper surface of the fixed adsorption layer is also provided with a drainage pipe groove intersecting with the water leakage hole, and the drainage pipe groove is parallel to the side where the protrusion is located . The pavement brick of the present invention not only has better anti-slip effect, but also can effectively discharge rainwater, so that not only is there no water accumulation on the surface in rainy days, but also the road surface water can be led to the roadside plants for irrigation, which has better use value.

The invention discloses a food processor with low noise. The food processor comprises a machine seat provided with a motor, a stirring cup connected with the machine seat and a grinding cutter arranged in the stirring cup; the upper end of the motor shaft of the motor is connected with the grinding cutter, the machine seat is provided with an air inlet and an air outlet, and the air outlet is located on one side of the lower part of the machine seat; and a heat dissipation air flue communicated with the air inlet is defined by the machine seat, a fan is arranged at the lower end of the motor shaft, a volute communicated with the heat dissipation air flue is arranged at the bottom of the machine seat, the volute is arranged at the periphery of the fan, a ventilation curve is arranged between the volute and the air outlet, wherein the arc length of the ventilation curve is L1, the arc length of the volute is L2, and the value of L1/L2 is higher than or equal to 0.5 and lower than or equal to 2. The food processor can effectively lower the noise, and thereby improving the user experience.

The invention discloses an online fuel reforming variable-combustion-mode engine and a control method, and belongs to the technical field of engine low-temperature combustion. Synthesis gas serves as a fuel source, and dimethyl ether fuel is prepared through tail gas energy reforming. In cold start, a dimethyl ether direct injection mode is adopted; under a medium or low load, a dual-fuel combustion mode of premixed compression ignition of dimethyl ether and synthesis gas is adopted; under a medium or high load, a combustion mode that dimethyl ether serves as ignition fuel to ignite synthesis gas is adopted. Smooth switching of a traditional diffusive combustion mode, a homogeneous gas mixture compression ignition mode and a reactivity-controllable compression ignition mode is achieved through fuel control over synthesis gas and dimethyl ether. According to the online fuel reforming variable-combustion-mode engine and the control method, switching of multiple combustion modes is achieved through the single fuel source, the efficient and clean internal combustion engine design concept is achieved, the effects of improving the heat efficiency of the engine and reducing the energy consumption of the engine are achieved by switching the combustion modes under different working conditions, and meanwhile emission of NOx and soot is effectively reduced.

The invention discloses artificial pebble and a preparation method thereof. The artificial pebble is prepared from an inner core component and an outer core component, wherein the inner core component comprises modified attapulgite clay, pasty attapulgite clay, activated carbon, diatomite, calcium carbonate, silicon dioxide, furnace slag, pyrethrum, peppermint, and clove oil; the outer core component comprises 8 parts of high-viscosity attapulgite clay, 6 parts of diatomite, 26 parts of polyurethane and graphene. The preparation method comprises the following steps of firstly, preparing the modified attapulgite clay and the high-viscosity attapulgite clay; then, preparing the pebble inner core; preparing an outer shell coating; finally, uniformly coating the surface of the inner core with the prepared outer shell coating. The artificial pebble has the advantages that the better mechanical property and water erosion-resistant function are realized; the better sound absorbing and adsorbing functions are realized; the problems of gradual exhaustion of natural resources, lack of natural pebble and difficulty in material selection due to condition limitation of region and environment, and the like are solved; the better ecological, environment-friendly and economic benefits are realized.

The invention relates to the technical field of hydrogen treatment, in particular to a hydrogen purification device and method. The hydrogen purification device is characterized by comprising a reaction assembly, wherein a noise reduction assembly is arranged on the reaction assembly and comprises a sound insulation box, the reaction assembly is arranged in the sound insulation box, the sound insulation box is formed by combining sound absorption plates made of sound absorption materials, the reaction assembly is placed in the sound insulation box, and condensed crude hydrogen is introduced into the reaction assembly to remove carbon monoxide. According to the invention, the purpose of reducing the harm of noise generated by a hydrogen extraction device to the body of a worker is achieved.

The invention provides an enclosed noise-reducing equipment cabinet, relates to an auxiliary apparatus in the computer industry and specifically relates to an equipment cabinet capable of reducing noise. The enclosed noise-reducing equipment cabinet comprises a cabinet body and cabinet doors; the cabinet doors are mounted on the back and the front of the cabinet body by use of hinges, respectively; the enclosed noise-reducing equipment cabinet is characterized in that a sound insulation felt, sound insulation cotton and egg-shaped noise reduction cotton are orderly mounted inside the cabinet body from outside to inside; an air duct is mounted on the upper part of the cabinet, and one end of the air duct extends into the cabinet, while the other end of the air duct is located outside the cabinet and connected with a fan at the top of the cabinet; an air-conditioner is mounted on the lower part of the inner wall of the cabinet body, and one end of an air-conditioner pipe is connected with the air-conditioner, while the other end of the air-conditioner pipe is arranged outside the cabinet body; a temperature sensor is mounted on the upper part of the inner wall of the cabinet. The enclosed noise-reducing equipment cabinet has the characteristics of novel structure, simple and convenient processing, safety for use, good heat dissipation, sound insulation and noise reduction effect, wide application range and the like, and is integrated with economic efficiency and practicability.

The invention discloses a noise reduction and elimination type box-type substation shell. The shell comprises an outer shell, a top cover, a supporting base and supporting legs, the top cover is fixedto the top of the outer shell, the supporting base is fixed to the bottom of the outer shell, heat dissipation holes are formed in the supporting base, the top cover and the supporting base enclose the outer shell into a closed box-type structure, and the supporting legs are fixed to the bottom end face of the supporting base; the outer shell is formed by sequentially connecting four wallboards,a movable door is connected to any wallboard, a sound absorption patch is bonded to the movable door, each wallboard comprises a sound attenuation layer, an electromagnetic shielding layer, a vacuum layer, a heat dissipation layer and an outer protection layer which are sequentially arranged from inside to outside, and the sound absorption layers, the electromagnetic shielding layers, the vacuum layers, the heat dissipation layers and the outer protection layers are fixedly connected with one another. The noise reduction and elimination type box-type substation shell is simple in structure, reasonable in design, high in overall structure compactness, good in sound insulation and noise reduction performance, high in heat dissipation efficiency, high in use safety and good in market application prospect.

The invention discloses an anti-theft glass window, which relates to the technical field of building safety equipment, comprising a first window frame, a window sash, an inner frame, an outer frame, a first glass, a second glass, and a third glass. In a window frame, the sash is provided with two opposite leaves, the cross section of the inner frame is "H" shape, the inner frame is provided with an inward groove and an outward groove, and the outward groove of the inner frame is set on the cross section as "U". In the "type outer frame, the first glass, the second glass and the third glass are arranged in parallel in the inward groove, the first spacer bar is arranged below the first glass and the second glass, the second glass and the second glass A second spacer is arranged below the three glasses, a shutter is arranged between the first glass and the second glass, a pressure sensor is arranged above the first spacer, and a diamond net is installed between the second glass and the third glass. The invention has the advantages of convenient operation and flexible use, and utilizes the pressure sensor and diamond net to play double anti-theft functions.

The invention discloses a vacuum pump configuration structure with a noise reduction function and a using method thereof, and relates to the technical field of vacuum pump noise reduction. The vacuumpump configuration structure comprises a protective outer box, fixing frames are fixed to the two sides of the protective outer box, through holes with the same inner diameter as the fixing frames areformed in the positions, corresponding to the fixing frames, of the two sides of the protective outer box, and a refrigeration mechanism is fixed to the inner sides of the fixing frames, the refrigeration mechanism comprises a first connecting frame, a first filter screen cover, a refrigeration sheet, a cooling fin, a cooling fan, a heat insulation pad, a connecting plate, a cold conduction block, a second connecting frame, a second filter screen cover and a cold conduction fan, and the first connecting frame is fixed to the inner sides of the fixing frames. Refrigeration is conducted throughthe refrigeration mechanism, the temperature in the protective outer box is kept at the low temperature, damage, caused by poor heat dissipation, of the vacuum pump is avoided, through cooperation ofa heat insulation foam pad and a sound absorption cotton pad, the device can reduce noise generated by the vacuum pump, and the noise reduction effect is effectively achieved.

The invention discloses sound insulation mortar and a sound insulation floor structure system. The sound insulation mortar is prepared from the following raw materials in parts by weight: 400-500 parts of cement, 300-500 parts of elastic damping aggregate, 30-50 parts of a tackifying aid, 250-290 parts of river sand and 0.5-2 parts of a water-retention thickening aid, wherein the water-binder ratio of the sound insulation mortar is 1: (0.3-0.5); and the elastic damping aggregate comprises rubber powder and rubber particles, and a mass ratio of the rubber powder to the rubber particles is (1.5-3): 1. Through grading between the rubber particles and the rubber powder, a good impact sound improvement effect is achieved, a sound insulation cushion layer does not need to be used, and building cost is greatly saved; and meanwhile, the defects that a protective layer is prone to cracking in a traditional floating construction method, and cross operation is prone to damage in the constructionprocess are effectively overcome.