4results about How to "Short flow path" patented technology

The invention discloses a light-emitting device and a preparation method thereof, a light-emitting module and a display device.The light-emitting device comprises a conductive connecting layer and N light-emitting units arranged at intervals, N is a positive integer and is larger than or equal to 2, N is an even number, and the adjacent light-emitting units are connected in series through the conductive connecting layer; the N light-emitting units comprise N / 2 odd-number light-emitting units and N / 2 even-number light-emitting units, the odd-number light-emitting units and the even-number light-emitting units are alternately arranged in the series connection direction, and a second semiconductor layer, an active layer and a first semiconductor layer are sequentially stacked on each odd-number light-emitting unit from the light-emitting face to the back face; a first semiconductor layer, an active layer and a second semiconductor layer are sequentially stacked on the even-number light-emitting unit from the light-emitting face to the back face. The light-emitting device is high in voltage and low in current, the size of the light-emitting device can be further reduced, and the light-emitting efficiency is improved.

The invention provides an RC-IGBT device structure and a manufacturing method thereof, the RC-IGBT device structure comprises a wafer, the bottom of the wafer is provided with a back metal layer, an FRD cathode and a collector electrode, the top of the wafer is provided with a cellular region, and the cellular region comprises a front metal layer, a P-Body region, a carrier storage layer, a Trench gate structure, an N-source region, a P-type deep groove region and the like. A P-Body region of an IGBT is multiplexed as an FRD anode, a P-type deep groove region penetrating into an N drift region is designed, and the layout that the back N + / P + width is accurately matched with half of the size of a front cell Pitch is matched, so that the through-current path is shortened, the conduction voltage and loss are reduced, the voltage resistance and through-current capability are improved, and meanwhile, the chip area is reduced. The RC-IGBT structure solves the problems of low cell density, large area and high loss of an existing RC-IGBT, meets the requirements of a power system for small size, high power density, low loss and high efficiency, and has remarkable technical innovation and application value.

The utility model discloses a wind shell assembly and a table top range hood, and belongs to the technical field of range hoods. The fan cover shell is provided with a containing cavity and an air inlet hole, and the air inlet hole is used for inputting air into the containing cavity so that high pressure can be formed in the containing cavity. The first shell is provided with an air exhaust channel; the second shell is provided with an exhaust channel, and the first shell and the second shell are arranged in the containing cavity and communicate with the two opposite ends of the air cover shell correspondingly. The outer diameter of the first shell is smaller than the inner diameter of the second shell, and the first shell extends into the second shell; a first annular air outlet is formed between the part, extending into the second shell, of the first shell and the second shell, and the first annular air outlet can output air in the containing cavity towards the exhaust channel, so that negative pressure is generated at the end, far away from the exhaust channel, of the air exhaust channel to suck oil smoke and the oil smoke flows to the exhaust channel. By optimizing the design of the air duct, the oil smoke suction efficiency of the table top range hood and the user experience can be improved.

This utility model relates to the field of building materials technology, specifically to a raised floor with air purification function, comprising interlocking sealed panels, air inlet panels, and air outlet panels. The sealed panels are arranged around the air inlet panels, and the air outlet panels are arranged around the sealed panels, with at least one sealed panel sandwiched between each air inlet and air outlet panel. The height of the air inlet panels can be raised, and an air intake power module is arranged below them. The height of the air outlet panels can also be raised, and an air purification module communicating with the air intake power module is arranged below them. The air purification module contains a rotatable cylindrical filter. This utility model integrates air purification function into the raised floor, eliminating the need for separate air purification equipment, saving indoor space, and eliminating the risks of tipping over or colliding with air purifiers on the ground, making it particularly suitable for places with limited space. Its filter is fully utilized, and filter replacement and fan maintenance are convenient.