37results about How to "Reduce working speed" patented technology

The invention discloses a self-pitching control blade turbine optimized based on a traditional Wells turbine. The self-pitching control blade turbine comprises a tubular hub; hub heads are mounted onthe two sides of the hub correspondingly; a movable blade wheel which can rotate around the hub is arranged on the hub in a nested mode; two or more movable blades are evenly arranged on the outer wall of the movable blade wheel in the circumferential direction; the movable blades are hinged to the movable blade wheel through pivots; a shaft sleeve with a key groove is arranged on a wheel disc ofthe movable blade wheel; a turbine shaft is mounted on the shaft sleeve, wherein one side of the turbine shaft extends out of the hub heads, and the turbine shaft can synchronously rotate with the movable blade wheel; and the upper side and the lower side of the movable blade wheel are further each provided with a circle of flow guiding blade set in the circumferential direction of the hub. According to the self-pitching control blade turbine, the movable blades can freely swing between an upper limiting point and a lower limiting point around the pivots of the movable blades, so that the deflection angle is autonomously changed according to the size and direction of a coming flow, in this way, the mounting angles of the movable blades can be changed at any time at different stages of a period of waves, and the period average efficiency of the turbine in the actual sea state is improved accordingly.

The invention provides an idle speed control method, device and control equipment of an excavator, which relate to the technical field of idle speed control and are applied to a controller of an excavator. If the start command of the excavator is not received within the preset first time period, the start command of the automatic idle mode is received and the gear position of the excavator is not changed within the preset first time period), the working speed of the excavator is reduced to the first level idle speed; if the idle speed command issued by the user is received, the first level idle speed is reduced to the second level idle speed; if it is detected that the excavator meets the preset The excavator changes the gear, receives the cancel instruction of the automatic idle mode of the excavator and receives the start instruction of the excavator), and increases the second-stage idle speed to the working speed. The invention can effectively reduce the stuck phenomenon of the excavator and reduce fuel consumption.

The invention discloses a louvered vertical axis resistance wind turbine, and belongs to the field of wind power generation. The principle includes that four louvered fan blades are symmetrically mounted on a vertical axis, each fan blade comprises a plurality of movable plates and fixed plates which are mounted into a vertical row at intervals, one fan blade is constantly placed at a windward position when the fixed wind turbine encounters wind with a certain strength, the movable plates at the top of the fan blade are blown and driven to realize self-starting, first-moving blades mounted on the outer side surfaces of the fan blades shift the movable plates through helical gear boxes at proper positions in the rotating process to generate rotating torque, the movable plates drop to a position parallel to the fixed plates when the first-moving blades do not generate the rotating torque, so that rotating resistance is minimum, the rotating torque of a resistance fan is in direct proportion to a windward area, the rotating resistance is in direct proportion to a choke area, the windward area to the choke area can reach hundreds to one by the aid of a movable plate structure, and the efficiency of the resistance wind turbine is greatly improved. By the aid of the structure, the manufacturing cost of the resistance wind turbine is low, and power can be improved by increasing the areas, so that wind power generation is high-power and low-cost.

The invention provides a model stage of a pipeline compressor with a flow coefficient of 0.02, including an impeller, a vaneless diffuser, a bend, and a reflux device. The outlet position of the model stage, the vaneless diffuser and the recirculator are connected through a bend; the machine Mach number M of the model stage u2 =0.35~0.65, design point flow coefficient Φ 1 =0.02, the design point energy head coefficient τ=0.53, the variable efficiency η under the design discharge coefficient working condition at each Mach number pcl =0.82~0.85, the applied flow range is 60%‑150% of the design point. A design methodology for the model stage impeller is also provided. The model stage of the present invention has high efficiency, high energy head coefficient, large hub ratio, and small span. Adopting the model stage can make the light medium compressor have higher operating efficiency and a wider range of working conditions, and at the same time can reduce the rotor work. speed, reduce the bearing span, and improve the stability of the rotor.

An air compression cavity of an air compressor A of the tail cooling rotor engine is communicated with an air collection cavity of an end cover from left to right through a peripheral cold flow channel A of a cold flow tail gas combination body, a peripheral cold flow channel B of an injection backflushing seat and a peripheral cold flow channel C of a main cylinder body; an air compression cavity of the air compressor A is communicated with an air collection cavity of the end cover from left to right through a middle cold flow channel A of the cold flow combination body, a middle cold flow channel B of the rotor, a middle cold flow channel C of the jet backflushing seat and a middle cold flow channel D of the main cylinder. The heat engine is high in efficiency, low in requirement for high-temperature performance of blade materials, low in rotor rotating speed and large in angular momentum, and is suitable for fluid-loaded aircrafts, ships and the like.

The invention discloses a combined structure of a transmission shaft end crossed shaft coupling. The combined structure comprises a transmission shaft, wherein both ends of the transmission shaft are connected with crossed shaft type universal joint shaft couplings; and the phase angle theta between the crossed shaft type universal joint shaft couplings is more than 0 degree and less than 90 degrees. The combined structure breaks through the connection mode of the prior crossed shaft type universal joint shaft coupling and solves the vibration problem of the transmission shaft; meanwhile, thecombined structure does not change the included angle between transmission shafts and the operating rotating speed of the transmission shafts, thereby reducing the operating vibration amplitude of the transmission shafts substantially; vibration reduction in the structure is more than three fourths of that of the prior proposal; moreover, the proposal is simple and easy to carry out and is suitable for the connection of a plurality of shafts.