39results about How to "Good noise absorption" patented technology

Provided is a noise-absorbing sheet that is highly effective at absorbing noise from magnetic and / or electric fields, the noise-absorbing effect being effective in wider bandwidths. A noise-absorbing sheet upon which at least two layers are stacked, wherein the noise absorbing sheet is characterized in that a magnetic body layer containing a magnetic material and a layer of a noise-absorbing fabric in which a metal is deposited on constituent fibers are layered on said sheet, and the common logarithmic value of the surface resistivity of at least one side of the noise-absorbing fabric is 0 to 6.

The invention discloses a soft magnetic alloy powder, a wave-absorbing sheet, a preparation method thereof, electronic components and electronic equipment, and relates to the technical field of electromagnetic protection. The preparation method of the high magnetic permeability magnetic powder and its wave-absorbing sheet includes: pressing common soft magnetic alloy powder into balls: material: dispersant: solvent mass ratio is (8-12):(0.5-1.5):(0.02- 0.08):(0.05‑0.15) is added into a ball mill for grinding, after ball milling, drying, annealing, sieving, and flattened high permeability soft magnetic alloy powder with an aspect ratio of 100‑200. It is further made into a wave-absorbing slurry, which is coated, dried, and calendered to make a wave-absorbing sheet. In the present invention, the flattened soft magnetic alloy powder reaches the optimal diameter-thickness ratio through ball milling, and at the same time adjusts the ratio of binder to powder composition and the forming process of hot pressing and then cold pressing to maximize the improvement of the wave-absorbing sheet Electromagnetic performance, to obtain a wave-absorbing sheet with high magnetic permeability.

The invention relates to an emergent diffusion device of a gas holder. The device comprises a steel rope, a diffusion valve, a first diffusion pipe and a safe diffusion pipe; the diffusion valve consists of a valve base and a valve cover; the valve base is a container provided with an opening in the top; the valve cover can totally cover and seal the opening in the top of the valve base; the valve base is fixed on a holder baseplate; two ends of the steel rope are respectively connected with a piston plate and the valve cover; the effective length of the steel rope is equal to the travel of a piston; and one end of the first diffusion pipe is communicated with the valve base, and the other end is communicated with the safe diffusion pipe after penetrating out of the gas holder. The device is simple in structure, low in cost and safe in operation; and the diffusion valve is put in the gas holder to achieve the effects of long service life and good noise absorbing effect.

The invention discloses an automatic production equipment for galvanized small-size steel wire ropes, which belongs to the technical field of metal rope manufacturing, and comprises a production casing, a base and an auxiliary casing, and the top of the base is fixedly installed with the production casing and the auxiliary casing; In the present invention, the wire rope produced by the production casing can be quickly rewound by installing the rope take-up roller and the driving machine in the auxiliary casing. At the same time, when the installation main shaft rotates, the driven gear can drive the The driving mechanism rotates. When the driving mechanism rotates, the moving screw sleeve on it can be moved. The side pusher can effectively push the rope take-up roller and move left and right, so that the produced steel wire rope can be effectively and evenly wound on the rope take-up roller. The uniformity of winding is good, and there will be no accumulation of winding in one place, so as to ensure the effective winding. At the same time, the rotating pinch roller can effectively compress the winding steel wire rope to make it more effectively wound. On the take-up roller, improve the take-up effect.

The invention discloses a bridge asphalt pavement structure and a construction method, and belongs to the field of pavement construction. The bridge asphalt pavement structure comprises a roadbed andan upper layer paved on the roadbed. The upper layer is provided with an expansion joint in the longitudinal direction, and the upper layer comprises an asphalt concrete layer located at a lower layerand an asphalt mixture layer. The asphalt mixture layer comprises a dense-graded asphalt mixture and an open-graded asphalt mixture, and the asphalt mixture layer has a thickness of 1.8-2.3cm. Duringthe construction, part of the upper layer is dug and removed, and then the dense-graded asphalt mixture and the open-graded asphalt mixture are paved. The construction method only needs to dig and remove about half of the thickness of the upper layer of the road surface, and energy saving and environmental protection are achieved. After the digging and removing thickness is reduced, the construction time is relatively shortened, construction noise and dust pollution are further reduced, and the interference with existing traffic and surrounding residents is reduced. The combination of the open-graded asphalt mixture and the dense-graded asphalt mixture is conducive to drainage and noise absorption, and the road surface is more secure.

The invention belongs to the field of electrical equipment accessories, and in particular relates to a motor liner assembly for a ceiling-type air conditioner and a ceiling-type air conditioner. The invention aims to solve the problem that the fan motor of the existing ceiling type air conditioner produces strong vibration and noise during operation, thus affecting user experience. For this purpose, the motor liner assembly of the present invention includes a first layer of liner and a second layer of liner connected to each other, a cavity is formed between the first layer of liner and the second layer of liner, so The motor is fixed on the second liner, and buffer units distributed in multiple points are arranged in the cavity. The above arrangement scheme of the present invention greatly reduces the vibration energy transmitted to the upper liner, thereby effectively reducing the vibration amount transmitted from the fan motor to other parts of the air conditioner, improving the reliability of the ceiling-type air conditioner, and increasing the vibration energy of the ceiling-type air conditioner. life cycle.

The invention provides a magnetic hole substrate for preparing a sheet-shaped electromagnetic noise suppression material and a preparation method thereof. The magnetic hole substrate includes an iron substrate and a porous layer on the iron substrate, and the porous layer is a nanoscale hole. The carbon-coated ferroferric oxide has a pore size of 50-150nm, and ferromagnetic nanowires can be deposited in the holes by an electroplating process as a sheet-shaped electromagnetic noise suppression material. The preparation method is as follows: first, the clean iron sheet is anodized, then soaked in glucose ethanol solution for 8-12 hours, dried, and finally annealed at 400-600 DEG C for 2-4 hours in an argon atmosphere. The present invention adopts magnetic material as hole substrate material, which enhances the ferromagnetic coupling effect between the magnetic nanowires deposited in the holes, has good noise absorption performance, and the absorption frequency can reach above 10 GHz; and it is easy to realize miniaturization and integration It can meet the demand for electromagnetic noise suppression in high frequency and wide frequency range.