164results about How to "Good sound insulation" patented technology

The invention relates to a novel floating floor and a building and constructing method for the same. The novel floating floor mainly comprises a reinforced concrete layer, a soundproof layer, a concrete cushion and a wood floor or other decorative floor on the concrete cushion, wherein, the soundproof layer is arranged between the reinforced concrete layer and the concrete cushion. The soundproof layer in the novel floating floor is made of polyolefin foaming materials which are formed by composition of a plurality of layers or by primary foaming and are provided with upper surface structures and lower surface structures. The total thickness of the polyolefin foaming materials is between 11 and 20 millimeters; the thickness of the upper layer is between 3 and 6 millimeters, and the density of the upper layer is between 50 and 100 kilograms per cubic meter; the thickness of the intermediate layer is between 5 and 8 millimeters, and the density of the intermediate layer is between 30 and 50 kilograms per cubic meter; and the thickness of the lower layer is between 3 and 6 millimeters, and the density of the lower layer is between 50 and 100 kilograms per cubic meter. The floating floor is waterproof, moistureproof and mildewproof, is small in thickness and light in weight, and has no pollution; and the floating floor does not require special construction equipment, can be conveniently laid, and is difficult to form rigid connection with a foundation floor and walling to create a sound bridge. The novel floating floor overcomes the defects of the prior floating floor, simultaneously has a good soundproof effect, is economic and practical, and has obvious effect.

The invention relates to a high-strength active powder fiber concrete slab characterized by comprising the following components of water with the water to binder ratio of 0.28-0.36 and ingredients, the ingredients comprise the following components in proportion (proportion by weight): 35-40% of quartz powder, 30-35% of cement, 6% of fibers and 24-29% of reaction assistants, wherein the fibers are vegetable fibers or / and alkali-resistant glass fibers; and the reaction assistants comprise 23-28% of mineral assistants and 1% of chemical assistants, wherein the mineral assistants are nano silica powder or / and pulverized fuel ash, and the chemical assistants are polyacrylic acid-series superplasticizers. Through synthesizing the characteristics of various materials, the finally obtained high-strength active powder fiber concrete slab has the advantages of light weight for lightening the weights of buildings, convenient transportation for improving the construction speed and shortening the construction period, fire and moisture prevention, heat insulation, good sound insulation and weather resistance, weathering resistance, acid rain resistance, ultraviolet ray resistance, no toxicity, no radiation and the like, can thin wall bodies to increase the usable areas of floors, and has light dead weight and good earthquake resistance so as to be beneficial to developing high-rise buildings and saving urban lands.

A decorative fastening aluminium-plastic plate is prepared through preparing plastic substrate from engineering plastics, filler, stabilizer, plasticizer, lubricant and assistant through mixing, granulating, extruding out, fixing shape, and cutting, preparing the coated aluminium foil through washing, removing oil, oxidizing surface, baking, painting, baking and coiling, combining said plastic substrate with aluminium foil, covering adhesive protecting film on the surface of aluminium foil, and cutting. Its advantages are high abrasion compression, fire and water resistance, good thermal and acoustic insulation, no poison and beautiful appearance.

The invention discloses an all-prefabricated rapid assembly type light-steel-keel load-bearing composite wall comprising square steel tube columns, an upper guide rail, a lower guide rail and wall units. The guide rails are U-shaped light-steel guide rails with flanges and webs, and the wall units are slidably arranged in a frame formed by the square steel tube columns at two ends and the upper and lower U-shaped light-steel guide rails in a filling manner. The wall units are prefabricated load-bearing members, each wall unit is composed of a pair of wall panels and a light gage steel joist stud and a heat insulation filling material clamped between the wall panels, parallel sliding grooves are formed between the inner sides of the wall panels at the top end and the bottom end and the heat insulation filling material as well as between the inner sides of the wall panels and light gage steel joist stud, and the parallel sliding grooves are in slide fit with the upper and lower guide rails; the flanges of the upper and lower guide rails are connected with the light gage steel joist studs in the wall units through bolts, and the guide rails are connected with the square steel tube columns through screws. The all-prefabricated rapid assembly type light-steel-keel load-bearing composite wall is few in variety of built-up members, lightweight, steel-saving, capable of realizing heat and sound insulation and applicable to low and multi-story building load-bearing wall systems, wet construction and the welding process on a construction site are omitted, large hoisting equipment is omitted, and quick all-prefabricated assembly construction can be achieved.

The invention relates to an active house that includes plate, beam column and door. The plate, beam column and door are made from felt made up from wasted textile fiber and a panel that the outside surface is solidified by alkalis endurable glass fiber pane cloth dipping concrete slurry, and the middle layer between the panels. The active house is light, easy to install, anti-corrosion, and low cost. Moreover, it can save large quantity of wood, metal and plastic that decreases the pollution to the environment. The house has more excellent capacity in sound insulation and warm aspects than the normal house.

A double cavity type piezoelectric micropump comprises a cover body, a shell and a pump core component, wherein the shell is fixedly matched with the cover body, pump cavities are defined by the cover body and the shell, and the pump core component is located in the pump cavity. The cover body is provided with a first locating protrusion and a first pre-pressing portion, and the shell is provided with a second locating protrusion and a second pre-pressing portion; the pump core component comprises a primary support together clamped by the first locating protrusion and the second locating protrusion, a secondary support fixedly matched with the primary support, a first elastic seal ring arranged on the primary support, a second elastic seal ring arranged on the secondary support, a first piezoelectric vibrator the periphery of which is pre-pressed on the first elastic seal ring and abuts against the first pre-pressing portion, a second piezoelectric vibrator the periphery of which is pre-pressed on the second elastic seal ring and abuts against the second pre-pressing portion, a first inlet valve and a first outlet valve arranged on the primary support, and a second inlet valve and a second outlet valve arranged on the secondary support. The double cavity type piezoelectric micropump has the advantages of being large in flow, compact and small in structure, low in noise and extremely high in practical value.

A building external sunshade wind resistance venetian blind driven by a side chain comprises louvre blades (29) and a motor (4). The louvre blades are all connected with a rotating chain (22) through a fork type connecting rod (21). The rotating chain and a rotating steel wire rope (10) are fixedly connected. A coil sleeve (7) is provided with a pawl (8) which is matched with a ratchet wheel (12). The centre shaft (12-1) of the ratchet wheel (12) is sleeved in the center hole (15-3) of a chain wheel (15). One end of a transmission torsion spring (13) abuts against a square key (15-2) of the chain wheel (15). The other end of the transmission torsion spring (13) abuts against an arc link stopper (12-2) of the ratchet wheel (12). A lifting chain (17) is meshed with the chain wheel (15). The chain (17) is connected with a small sliding block (18) and a big sliding block (25). The big sliding block (25) is connected with the bottom louvre blades (29) through a bottom hook (26). The building external sunshade wind resistance venetian blind driven by the side chain not only has good sunshade wind resistance functions but also has noise reduction, heat preservation and theft-proof functions.

The invention discloses a door frame and a door frame bending die and bending method and belongs to the technical fields of dies and bending. The door frame bending die comprises a lower die, a right-angle upper die, a 45-degree upper die, an edge folding upper die and a flattening upper die, wherein a lower die edge folding groove of the lower die is matched with the edge folding upper die and used for bending a folded edge protrusion. A lower die pre-folding groove is matched with the 45-degree upper die and used for folding a transition section and pre-bending a flatly-folded section. A first V-shaped groove and a second V-shaped groove of the lower die are matched with the right-angle upper die. The door frame bending die is reasonable in structural design, the matching performance of the upper dies and the lower die is good, reasonable avoiding can be achieved, forming effect is good, only four upper dies are used for machining the complicated structure, and machining cost is low. The door frame bending method is reasonable in machining sequence arrangement, no interference phenomenon occurs in the machining process, machining efficiency is high, and a machined door frame is tight in closing and good in sound insulation effect.

The invention discloses a sound-proof modified asphalt waterproof roll and a preparation method thereof. The waterproof roll comprises the following components in parts by weight: 60-80 parts of modified asphalt, 20-30 parts of an ethylene-propylene-diene monomer, 2-3 parts of a silane coupling agent, 6-12 parts of asbestos wool, 1-2 parts of carbon fiber, 1-2 parts of a sulfurizing agent, 2-3 parts of a co-sulfurizing agent, 0.8-2 parts of an antioxidant and 20-30 parts of a filler, wherein the modified asphalt is polydopamine modified asphalt. The waterproof roll prepared by using the modified asphalt, the ethylene-propylene-diene monomer, the silane coupling agent, the asbestos wool, the carbon fiber, the co-sulfurizing agent, the antioxidant and the filler as raw materials is good in sound-proof performance, and has the advantages of high strength, large elongation at break and good waterproof performance.

The invention discloses energy-saving, environment-friendly, broken-bridge and heat-insulating aluminum alloy doors and windows. The frames, the mullions and the fan frames of the doors and windows are respectively composed of outdoor and indoor aluminum profiles and heat insulating strips. The heat insulating strips include three structures: a heat insulating strip A for the frames of identical width, a heat insulating strip B for the mullions and a heat insulating strip C for the fan frames. The heat insulating strips A, B and C, heat insulating supporting rubber strips and constant-pressure rubber strips are in multi-cavity structures. Outdoor insulating glass is fixed through outside sealing rubber strips in a press-joint manner, indoor insulating glass is fixed through inside sealing rubber strips in a press-joint manner, the middle is fixedly supported by insulating supporting rubber strips, the insulating supporting rubber strips are fixedly connected with the heat insulating strips A, B and C respectively, and the insulating strip B is fixedly connected with the insulating strip C by the aid of the constant-pressure rubber strips. The energy-saving, environment-friendly, broken-bridge and heat-insulating aluminum alloy doors and windows are fine in waterproofing, heat and sound insulating effects, and high in energy saving rate and can meet national or regional demands for energy conservation.

The present invention relates to a floor sound proof / damping material containing resin foam material for building. A floor sound proof / damping material for building is provided in the present invention, it comprises an opening unit comprising resin foam material whose diameter is 0.05 mm to 2.0 mm, the open rate is more than 20 percent, density is 10kg / m<3> to 25g / m<3>, anti-pressure strength is 5kgf / 314cm<2> to 15kgf / 314cm<2>. The floor sound proof / damping material of the present invention can effectively absorb and disperse (damping) noise and vibration brought by collision, thereby effectively shade collision noise.

The invention discloses a halogen-free flame-retardant sound-insulation composite material. The halogen-free flame-retardant sound-insulation composite material provided by the invention is a multi-layer polymer composite material formed by alternately superosing polymer-matrix sound-insulation layers and polymer-matrix halogen-free flame-retardant layers. The halogen-free flame-retardant sound-insulation composite material is endowed with flame-retardant performance by virtue of the flame-retardant layers and endowed with sound-insulation performance by virtue of the sound insulation layers; not only can the overall sound insulation performance of the composite material be obviously improved, but also the HL-3 grade (R10) in the newest European Union flame-retardant standard EN45545-2 can be met.

The invention provides a hollow microspheres-enhanced polyimide matrix foamed composite material and a preparation method thereof. The apparent density of the foamed composite material is 0.023-0.035g / cm<3>, the foam shrinkage rate is -35.0% to -20.0%, the compressive strength is 0.05-0.35MPa, the impact strength is 20-60KJ / m<2>, and the average sound absorption coefficient within the frequency range of 125-4,000Hz is 0.40-0.51. The preparation method comprises the following steps: mixing aromatic dianhydride with aromatic diamine and a surfactant to obtain a foaming precursor after esterifying the aromatic dianhydride; adding hollow microspheres and a foaming agent to a precursor solution, and heating the solution to obtain a foaming block; finally carrying out thermal imidization on the foaming block to obtain the foamed composite material. According to the method, the foamed composite material with good mechanical property, and excellent sound absorption and sound insulation can be prepared.

The invention discloses full-light self-thermal-insulation concrete and a preparation method. The self-thermal-insulation concrete is prepared from, by mass, 15-45 parts of Portland cement, 5-15 parts of fly ash, 5-15 parts of palletized blast furnace slag fine powder, 10-35 parts of ceramsite, 12-30 parts of ceramic sand, 0.1-0.6 part of ecological fiber, 0.1-2 parts of foaming agent, 0.2-1.0 part of thickener and 10-30 parts of water. The preparation method of the concrete includes the steps that Portland cement, fly ash, palletized blast furnace slag fine powder and thickener required by preparation are placed together to be stirred and mixed for 3-6 min, then water and foaming agent required by preparation are sequentially added into the mixture and continue to be stirred for 10-15 min, and a pulp mixture is obtained. The ecological fiber has good tensile deformation resistance and is low in specific gravity, so the foamed concrete is ductile, China has rich ecological plant resources so that a lot of resources can be saved, and the survival environment of human is benefited.

The invention discloses light leveling dry-mixed mortar which comprises, by weight percentage, 20-80% of desulfurized gypsum, 0-20% of fly ash, 20-80% of calcium carbonate, 0-20% of cement, 0-30% of sand, 1-12% of lightweight aggregate, 0-0.1% of starch ether, 0-0.5% of magnesium aluminosilicate, 0-3% of redispersible latex powder, 0.1-0.5% of cellulose ether, 0.02-0.15 part of retarder and 0-0.8 part of water reducing agent. The light leveling dry-mixed mortar has the advantages of not cracking, being firmly bonded to a base material, regulating air humidity, having an excellent sound insulation function, being green and environmentally friendly, saving energy and being safe and the like, and conforms to application requirements in modern construction engineering.

The invention discloses a plate. The plate comprises three layers; a ceramsite bottom layer is arranged on one side of the plate; a cavity is formed in a middle layer of the plate at intervals; micro pores are formed between the cavity and the ceramsite bottom layer; a cement solid surface is arranged on the other side of the plate; and a reinforcing steel bar screen plate is arranged on the bottom layer of the plate. The plate has the advantages that a plate surface is fluffy so that sound wave absorption can be weakened; a composite board has an integrated structure, is mounted integrally, and is convenient to use and not easy to damage; the cavity can be filled with sound-absorption or sound-insulation materials, and a noise reduction effect is improved; and a sound-insulation plate can be made of light materials such as cement, perlite and ceramsite, material sources are wide, the manufacturing cost is low, and the materials and the cost are saved.

The invention discloses a heat-insulation and sound-insulation composite plate which is composed of two layers of heat insulation plates and two layers of sound insulation plates arranged between the heat insulation plates, wherein the heat insulation plates and the sound insulation plates are bonded with a sound insulation adhesive, a layer of wooden moisture-proof plate adheres to the outer side of each heat insulation plate with glue, the heat insulation plates are made of any one or two of polyethylene foam plates, polyurethane foam plates and polystyrene foam plates, the sound insulation plates are rock wool plates, and the sound insulation adhesive is prepared in the mode that 120 parts of cement, 30 parts of expanded perlite and 10 parts of silicon dioxide are mixed evenly, then 100 parts of 60-65 DEG C hot water is added, and then stirring is conducted to obtain the sound insulation adhesive. The heat-insulation and sound-insulation composite plate is good in sound insulation effect and heat insulation effect, simple in production technology and resistant to fire, and dual-sound-insulation is achieved by the sound insulation layers.

The invention relates to a car elastomer sound insulation material and a manufacturing method thereof. The car elastomer sound insulation material is prepared by mixing thermalplastic elastomer POE (polyolefin elastomer) and PE (poly ethylene), inorganic filler barite powder and filling oil, the weight ratio of POE: PE: barite powder: filling oil is (70-80): (20-30): (280-290): (10-20), the total part of the POE, PE, barite powder and filling oil is 400. Compared with the prior art, the car elastomer sound insulation material filled with the thermoplastic elastomer POE and barite powder has good physical properties and good sound insulation effect, and can reduce the passenger compartment noise and ensure a quiet and comfortable environment for drivers and passengers. The sound insulation material is tested for many times, the sound insulation material with different thickness has different sound insulation effects, and in general condition, the sound insulation effect is increased while the thickness is increased, and the sound insulation material can be adjusted according to the design requirement.

The invention discloses a double-row keel sound-isolation wall body, which overcomes the defects of poor sound isolation effect, excessive indoor space occupation, high construction cost and insufficient technical schemes of good-sound-isolation structures of conventional sound-isolation wall bodies. The wall body comprises double rows of Z-shaped keels (1), wherein a first paper surface gypsum board layer (2) is arranged at the first side of the double rows of Z-shaped keels (1); a second paper surface gypsum board layer (3) is arranged at the second side of the double rows of Z-shaped keels (1); a third paper surface gypsum board layer (4) and sound-isolation felt (5) are arranged between the double rows of Z-shaped keels; a first cavity formed between the first paper surface gypsum board layer (2) and the third paper surface gypsum board layer (4) is filled with rock wool (6); a second cavity formed between the second paper surface gypsum board layer (3) and the third paper surface gypsum board layer (4) is filled with rock wool (6); and one row of Z-shaped keels is arranged in each of the first cavity and the second cavity. The double-row keel sound-isolation wall body provided by the embodiment of the invention has a good sound isolation effect on both low-frequency sound and high-frequency sound.

The invention provides a sulphoaluminate foamed cement heat insulation board with a good sound insulation effect. The sulphoaluminate foamed cement heat insulation board is prepared from the following components in parts by mass: 45-50 parts of sulphoaluminate cement, 1.5-1.8 parts of expanded perlite, 0.5-0.8 part of pottery clay, 8-10 parts of coal ash, 1.2-1.5 parts of gypsum, 0.6-0.8 part of polypropylene fiber, 1.8-1.0 part of calcium stearate, 0.2-0.4 part of sodium metasilicate, 2.6-2.9 parts of 35% hydrogen peroxide, 3-5 parts of a lithium-based curing agent and 42-46 parts of water. The invention also provides a preparation method of the sulphoaluminate foamed cement heat insulation board. The sulphoaluminate foamed cement heat insulation board provided by the invention is favorable in heat insulation and sound insulation effects and suitable for a heat insulation system for an exterior wall.

The invention relates to an automobile soundproof material, in particular to an automobile soundproof material and a preparing method thereof. The soundproof material is prepared from 90-100 parts of ethylene vinyl acetate copolymers, 3-10 parts of nanosilicon dioxide, 1-2 parts of coupling agent, 1-2 parts of cross-linking agent and 0.5-1 part of antioxidant. According to the soundproof materials, as the ethylene vinyl acetate copolymers are adopted, and the nanosilicon dioxide servers as filler, the amount of added filler is small, and the prepared material is good in soundproof effect; meanwhile, the soundproof sheet prepared with the preparing method is small in density and small in weight, and conforms to the lightweight trend of automobiles.

The invention discloses a manufacturing method of a titanium alloy sound insulation door. The titanium alloy sound insulation door comprises a door frame and a door leaf. The door leaf comprises an inner door plank, an outer door plank and a frame (8) enabling the inner door plank to be connected with the outer door plank. The titanium alloy sound insulation door is sequentially provided with the inner door plank (1), a first fireproof layer (2), a first sound insulation layer (3), a core plate layer (4), a second sound insulation layer (5), a second fireproof layer (6) and the outer door plank (7) from inside to outside. Both the inner door plank (1) and the outer door plank (7) are made of titanium alloy plates. Firstly, the first fireproof layer (2), the first sound insulation layer (3), the core plate layer (4), the second sound insulation layer (5), the second fireproof layer (6) and the outer door plank (7) are sequentially placed on the inner door plank, and then the inner door plank and the outer door plank are fixed through the frame. Through the multilayer design and the design of preparation methods of each layer, the titanium alloy sound insulation door has a great sound insulation effect, the door strength and the fireproof effect are improved, and the requirements of special occasions are completely met.

The invention relates to an efficient space-extended composite sound insulation structure. The structure comprises a sound insulation base layer, and the sound insulation base layer is of a regular plate-cavity-plate composite sound insulation structure; one side of the sound insulation base layer is provided with a low-frequency sound absorption body which is of a hollow structure in a composited mode; and a continuous and bent acoustic wave passageway is formed in the low-frequency sound absorption body, and an acoustic wave inlet is formed in the side face, be back on to the sound insulation base layer, of the acoustic wave passageway. According to the efficient space-extended composite sound insulation structure, through structural design of the continuous and bent acoustic wave passageway in the low-frequency sound absorption body, the acoustic wave propagation route is prolonged, and acoustic reactance is improved; and a good sound insulation effect is achieved aiming at low-frequency noise, and by adjusting the length of the acoustic wave passageway, the different acoustic wave frequency band ranges can be aimed at.

The invention discloses a silencer of a compressor and a compressor provided with the same. The silencer comprises an outer shell and an inner shell, wherein the outer shell is internally provided with a cavity, and the top of the cavity is open; the inner shell is arranged in the cavity, and a sound insulating cavity is defined between the inner shell and the outer shell. According to the silencer of the compressor, disclosed by the embodiment of the invention, the inner shell is arranged in the cavity of the outer shell, and the sound insulating cavity is defined between the inner shell and the outer shell, so that reflection times of sound wave in a transmission process can be increased through an air layer of the sound insulating cavity, the air layer of the sound insulating cavity has the effect of additionally adsorbing the sound wave, and the silencer has a good sound insulation effect, and the sound insulation effect of the silencer can be enhanced.

The invention is the linearity rabbet brickwork Assembling type wall body and the construct method. The wall body is composed of linearity rabbet brickwork, the connection part with rabbet. The connection part is fixed on the up-and-down floor; there is the heat preservation material or deadening interlayer between two layers of linearity rabbet brickwork, the crack on the surface of the linearity rabbet brickwork. The construct method is that when put the first row linearity rabbet brickwork, we locate the connection part and connect to the up-and-down floor, and then put the other linearity rabbet brickwork according to first-outside second-inside, put the heat preservation material or the deadening into the room formed by the inner and outside linearity rabbet brickwork. On the surface of the linearity rabbet brickwork, we spurts spreads or brushes spreads the rubber to seal the crack, and fill concrete in the jointing rabbet which is on the connection board, and then form the pitch point. The merit of the invention is that the whole capability of the wall body is well and its structure is simple and construct is convenience.

The invention discloses a sound-isolating screen for urban roads and bridges. The sound-isolating screen comprises a sound-isolating screen main body, wherein the sound-isolating screen main body is composed of a dustproof plate arranged at the top of the sound-isolating screen main body and a sound-isolating plate arranged at the bottom of the dustproof plate; and the dustproof plate is welded with the sound-isolating plate. According to the sound-isolating screen, a damping plate is arranged on the sound-isolating screen for urban roads and bridges; the physical isolation is achieved while the noise spread is stopped; the soundproof effect is excellent and the noise pollution is effectively reduced; the raw materials are capable of effectively retarding flame and preventing the fire spread, so that the safety is higher; the raw materials are also effective anticorrosion, so that the service life of the sound-isolating screen is prolonged; a transparent plate is arranged, the light transmittance is promoted in a visual road section and the lighting effect is excellent, so that the traffic accident caused by unclear sight of the driver can be avoided; and a spring bumper is arranged, so that the collision of the vehicle to the sound-isolating screen can be effectively relieved, the sound-isolating screen can be prevented from being damaged and the safety of the sound-isolating screen and the driver can be effectively guaranteed.

The invention discloses an irregular brick, comprising a top face, a bottom face, two end faces and two side faces, wherein at least tow horizontal upper convex ridges are arranged on the top face of the brick longitudinally in parallel, at least two horizontal lower concave grooves are arranged at the bottom face of the brick, and the horizontal upper convex ridges are matched with the horizontal lower concave grooves; at least two vertical convex ridges are arranged at one side face of the brick, at least two vertical concave grooves are arranged at the other side face of the brick, and the vertical convex ridges are matched with the vertical concave grooves; a plurality of upper lug bosses are arranged on the horizontal upper convex ridges, and the depth of each horizontal lower concave groove is equal to the sum of the thickness of each horizontal upper convex ridge and the thickness of each upper lug boss; and a horizontal lower convex ridge is arranged between two adjacent horizontal lower concave grooves on the bottom face, and a plurality of lower lug bosses are arranged on the horizontal lower convex ridges. The invention further provides a wall body structure made from the irregular bricks. According to the invention, the provided irregular brick can be used for enhancing the leakage-proof performance and the anti-seismic steadiness of a wall body made from the irregular bricks, and the provided wall body structure has the advantages of single-side leakage-proof performance, anti-seismic steadiness and favorable water-permeating and soil-retaining effects.

The invention provides a noise-reduction protective apparatus for a power distribution transformer, and belongs to the technical field of the transformer. The noise-reduction protective apparatus comprises a side wall, a top plate, and a supporting beam, wherein the side wall comprises a foam concrete wall body and a PVC board from outside to inside in sequence; the outer side face of the foam concrete wall body is coated with a transparent waterproof material; the inner side face of the PVC board is coated with shielding coating; a gap is formed between the foam concrete wall body and the PVC board; a sealed hollow cavity is formed in the gap; the circumferential side of the sealed hollow cavity is filled with a thermal insulating material; the sealed hollow cavity is connected with a protective cavity through multiple threaded holes; the threaded holes are formed in a tilted manner; the threaded holes are connected with an air injection mechanism; the air injection mechanism comprises an air injection pipe which is connected with the threaded holes in a matching manner; the sealed hollow cavity is connected with an air supply mechanism; an air exhausting mechanism is arranged on the top plate; and a temperature monitoring module and a smog monitoring module are arranged in the protective cavity. The noise-reduction protection apparatus is good in shielding effect, capable of reducing outward propagation of noise, and capable of realizing effective fireproof and temperature-reducing effects.

A mounting section structure for mounting a dash silencer in a tightly stretched state on the operating compartment-side surface of the dash panel of an automobile in order to reduce the propagation of noise generated in the engine compartment into the operating compartment is improved to facilitate the mounting of the dash silencer. A stud pin (6) is caused to protrude from the operating compartment-side surface of a dash panel (5). A chevron-shaped elongated cut (2) is formed in a mat-like dash silencer (1). The stud pin (6) is inserted through the elongated cut (2) to mount the dash silencer (1) on the operating compartment-side surface of the dash panel (5). When forming the chevron-shaped elongated cut (2) in the dash silencer (1), the lower edge (3) of the elongated cut (2) is bent toward the operating compartment so that the lower edge (3) protrudes further in a stepped shape toward the operating compartment side than the upper edge (4).

The invention belongs to the technical field of walls and discloses a wall with a sound insulation function. The wall comprises a U-shaped keel. An inner cavity of the U-shaped keel is provided with sound absorption cotton; the sound absorption cotton is in a sine shape, and D-shaped keels are arranged in the wave crest and wave trough positions of the sound absorption cotton correspondingly; inner gypsum boards are mounted on the left portion and the right portion of the top end and the bottom end of the U-shaped keel correspondingly; outer gypsum boards are arranged on the outer walls of thefour inner gypsum boards correspondingly; self-tapping screws are mounted on the outer walls of the inner gypsum boards and the outer gypsum boards correspondingly; and the inner gypsum boards and the outer gypsum boards are connected with the U-shaped keel and the D-shaped keels through the self-tapping screws correspondingly. The parts, between the gypsum boards, of the sound absorption cottonand the D-shaped keels form a plurality of spaces similar to resonant chambers, sound waves are reflected and absorbed in the multiple resonant chambers, so that energy is cooled and consumed, and thesound insulation effect is excellent; and in addition, the gypsum boards are light, high in strength, easy to process, fireproof and mothproof, and the sound insulation effect of the wall is furtherimproved through the two sets of gypsum boards.