5results about How to "Improve total pressure efficiency" patented technology

The present invention belongs to the technical field of gas turbines, and specifically relates to a semi-open centrifugal impeller with splitter blades, including a hub, main blades, and splitter blades. The hub is convex, and a concave arc-shaped transition section is provided on the hub. The main blades and splitter blades are evenly distributed on the arc-shaped transition section and are reinforced and connected to the hub through the blade root fillet. The rear end face of the hub is arc-shaped, and the dynamic balance counterweight hole and the dynamic balance deweighting belt are respectively arranged on the upper and lower end faces of the hub, and the dynamic balance effect is good. The present invention adopts the main blades and splitter blades to be evenly distributed alternately on the arc-shaped hub, and the structural strength is high. The main blades and splitter blades can pressurize the incoming gas in turn, and the total gas pressure efficiency is high, the pressure ratio is high, and the uniformity of airflow pressure is good, which ensures that the impeller can rotate stably at high speed, the vibration of the impeller is reduced, the centering ability of the impeller is enhanced, the noise is reduced, the durability is enhanced, and a relatively long and stable service life is guaranteed.

The utility model provides an exhaust light guide device which comprises an exhaust assembly, a light guide assembly, a solar photovoltaic panel, an electric exhauster or a lighting lamp and the like, the exhaust assembly comprises an air guide exhaust cover and a ventilation light guide pipe, and the light guide assembly comprises a lighting protective cover and a ventilation light guide pipe. The air guide exhaust hood and the ventilation light guide pipe have a flow guide effect on incoming flow and generate negative pressure exhaust at the exhaust port; when sunlight, wind or no wind exists, the lighting protective cover and the ventilation light guide pipe can guide external light into a room, and meanwhile the solar photovoltaic panel generates electricity and drives the electric exhaust fan to exhaust air or supply energy to the illuminating lamp through the control circuit. The device can utilize natural wind power, solar energy and indoor hot air buoyancy to exhaust or illuminate, airflow does not flow backwards, and the device is simple in structure, high in wind resistance, low in cost, long in service life, low in noise and high in exhaust efficiency. The device is used for places where structures need exhausting, lighting or ventilation and heat dissipation.

The invention provides an axial flow fan which comprises a silencer shell, an impeller is arranged outside one side of an air outlet of the silencer shell, a flow guide cover is arranged on a hub on one side of an air inlet of the impeller, a machine shell barrel is arranged outside the impeller, a space guide vane is arranged on one side of the air outlet of the impeller and on the inner side of the barrel, a motor is arranged in the space guide vane, and a fan is arranged in the motor. And triangular rib plates are arranged on the inner sides of the flanges at the two ends of the shell cylinder. The structural strength of the fan can be effectively enhanced, the vibration index of the shell barrel is improved, the total pressure efficiency of the fan is effectively improved, and noise is reduced; the boundary dimension of the fan with the same purpose and the same performance is effectively reduced, and miniaturization is achieved; the rotor dynamic balance precision and the whole machine dynamic balance precision of the fan are effectively improved, the manufacturing process is simplified, and the whole machine stability is improved.

The application provides a semiconductor device, a manufacturing method of the semiconductor device and an electronic device. A first field plate polysilicon in a groove is arranged in a plurality of L-shaped structures arranged in layers, and a voltage division cascade groove field plate structure is formed by connecting the first field plate polysilicons in the same layer through a voltage division ring. In this way, by increasing the number of voltage division cascade field plates in the unit groove depth, the electric field distribution in the drift region can be closer to a rectangular distribution, higher voltage resistance efficiency can be achieved, the area of the active region drift region can be increased, the resistivity of the drift region can be reduced, and the current density of the device can be improved.

The invention discloses an integrated two-stage total-pressure synergistic fan system and oil smoke suction and exhaust equipment, a blade assembly comprises a first-stage blade group and a second-stage blade group which are integrated on the same wheel carrier, and each of the first-stage blade group and the second-stage blade group comprises a plurality of blades which are distributed at intervals in the circumferential direction to form an annular structure; the first-stage blade group and the second-stage blade group are coaxial with each other; first-stage blades of the first-stage blade group penetrate through the central connecting body and are positioned in working areas on the front side and the rear side of the impeller; secondary blades of the secondary blade group are connected between the front ring and the rear ring and penetrate through the middle disc; the rotating directions of all the first-stage blades are the same, the rotating directions of all the second-stage blades are the same, and the rotating directions of the first-stage blades are opposite to the rotating directions of the second-stage blades; and the first-stage blade group performs first-stage acting, so that the airflow speed is remarkably increased in a short time, the static pressure energy of the fan system is improved, the airflow is turned in advance, the energy loss is reduced, the airflow is more uniform, the total pressure efficiency of the fan system is improved, and the air performance of the fan system is optimized.