38results about How to "Reduce shaft power" patented technology

The invention discloses an energy-saving control method for a compressed air industrial screw-type air compressor group control system. The method comprises automatic control of the number of air compressors and automatic loading and uploading control of screw-type air compressors. In the system, gray scale prediction of total run traffic is conducted to control start and stop of the air compressors, so that the frequent start and stop defect of the air compressors is overcome, and the system operation stability is greatly improved; meanwhile, automatic loading and uploading control of the screw-type air compressors is carried out, so that the system operating pressure is stable, the pressure fluctuation range is reduced, and a defect that the power consumption of a frequency converter is increased caused by modification of frequency conversion control of an air compressor group. The method has the characteristics that the energy utilization efficiency is high, and the system is flexible in operation and stable in running.

An air-conditioning system for a cabin of a motorized vehicle comprising of an evaporator and desiccant, where said desiccant is downstream of evaporator, and said desiccant is a rotor that uses nearby excess heat to regenerate the desiccant.

The invention discloses a method for improving the efficiency of a gas drainage liquid ring vacuum pump through a macromolecular drag reduction agent, and belongs to methods for improving the efficiency of liquid ring vacuum pumps. The method comprises the steps that the quantitative macromolecular drag reduction agent is prepared and poured into a circulating pool continuously through a drag reduction agent filling machine till the optimal drag reduction concentration is reached; the gas drainage liquid ring vacuum pump is operated, and the macromolecular drag reduction agent serves as a working medium of the liquid ring vacuum pump to conduct gas drainage; and the viscosity and the liquid level of the drag reduction agent as well as the operation performance of the gas drainage liquid ring vacuum pump are monitored in real time, accordingly, the quantitative drag reduction agent is supplemented in the fixed time, and the drag reduction performance and the liquid level of the drag reduction agent are maintained. The macromolecular drag reduction agent is a polyacrylamide solution with the concentration being 0.1-0.5%. Through the method, the efficiency of the liquid ring vacuum pump can be substantially improved, operation energy consumption can be reduced, and the maintenance period and the service life of the liquid ring vacuum pump are obviously prolonged.

The objects of the present invention are to improve the fan efficiency by the decrease of the shaft power of a fan and/or the increase of the pressure rise owing to a fan impeller, which are accomplished by the rational control of the energy based on the tangential velocity of the prerotation flow generating at "the region ahead of an impeller' inside the suction pipe of a fan, and to reduce fan noise by the improvement of air flow at the portion in close vicinity to an impeller inside the suction pipe. The present invention is related to a by-pass unit (5) disposed upstream an impeller to control the energy generated by the air flowing into the impeller (1), comprising a specific region of a suction pipe (2) as a part of the by-pass unit (5), an air chamber (3), through which the air is able to pass, forming a closed spatial region outside the suction pipe (2), and communicating passages (4) for connecting the closed spatial region to the suction pipe (2).

The invention relates to an impeller which comprises an impeller body. Multiple blades distributed in the circumferential direction are arranged on the impeller body; and each blade is gradually warped from the center of the impeller body to the edge part of the impeller body. The invention further relates to a slurry pump which comprises a welding bottom plate. A motor and a bracket are fixed onto the welding bottom plate; a shaft seal transmission part is arranged on the bracket; a pump shaft is connected into the shaft seal transmission part; a coupler is arranged at one end of the pump shaft; a pump body is arranged at the other end of the pump shaft; and the pump shaft is connected with the motor through the coupler. The slurry pump further comprises the impeller; a pump body is a sealed chamber; and the impeller is arranged in the chamber and is fixedly connected with the pump shaft. The impeller and the slurry pump provided by the invention are reasonable in structure design andbeneficial to improving the efficiency of the pump.

The invention discloses a water outlet body structure which comprises a water outlet main body. The water outlet main body comprises a water outlet body cover and a water outlet body liner. The water outlet body liner is sleeved with the water outlet body cover which is connected with the outer wall of the water outlet body liner in a clamped mode. The water outlet body liner comprises a water inlet end and a water outlet end. The water outlet end protrudes out of the water outlet body cover. A fluid cavity of a smooth step structure is formed in the water outlet body liner. Internal threads are formed in the portion, at one end of the water outlet end, of the cavity wall of the fluid cavity. At least two notches are evenly distributed in the side face of the water outlet body cover circumferentially. Through holes are formed in the portions, corresponding to the notches, of the end face of the water outlet body cover. By means of the water outlet body structure, it can be ensured that smooth transition is adopted for the streamline of the fluid cavity, a good diversion effect is achieved, the effect of reducing hydraulic loss is achieved through the regular area change of collected water, the high-flow lift and efficiency are remarkably improved, the shaft power is reduced, the work efficiency of a pump is improved, and cost is reduced.

The invention discloses an ultralow-temperature coal economizer for a single-reheat unit, particularly for a single-reheat coal-fired power generation unit. The ultralow-temperature coal economizer can replace low-pressure heaters to heat condensed water and is provided with condensation type heating surfaces which can recover vaporization latent heat of water vapor contained in part of discharged smoke. Low-temperature condensed water is used for absorbing nearly half of evaporation heat in the water vapor contained in the smoke; the temperature of the smoke is reduced to 50 DEG C; and electric energy generated additionally by a sixth-stage vapor extractor, a seventh-stage vapor extractor and an eighth-stage vapor extractor which are replaced can reduce the heat consumption of a generator set by 2.3%. Compared with the prior art, the ultralow-temperature coal economizer does not exclude partial vapor extraction or vapor extraction at a certain stage but completely replaces the low-pressure heater; water-side resistance of the ultralow-temperature coal economizer is far less than the sum of water-side resistance of four low-pressure heaters, and the shaft power of a condensate pump is reduced remarkably; the temperature of smoke which enters a desulfurizing tower is reduced remarkably, dosage of process water is reduced substantially, and the power consumption of an induced draft fan is reduced remarkably; and in a condensing and heat-releasing process, water vapor can also absorb PM2.5, SO3 and NOx in the smoke, and the micro-discharge of the coal-fired power generation unit is facilitated.

The invention provides an air compressor with the adjustable oil injection quantity. The air compressor comprises a main body and an oil-gas cooler. The main body and the oil-gas cooler are connected through an oil pipeline. The air compressor further comprises a flow-limiting hole, a bypass pipe and a valve. The oil pipeline is provided with the flow-limiting hole. The bypass pipe is arranged at the flow-limiting hole. The valve is arranged on the bypass pipe. The air compressor has the advantages that the flow-limiting device is additionally arranged on a main oil injection pipeline, and the value is obtained through calculation according to the optimal state of the main body under various working conditions, powers, pressures and seasons and the minimum oil quantity capable of meeting gear, bearing and rotor lubricating requirements. Due to the fact that the bypass pipe is additionally arranged on one side of the flow-limiting hole and the bypass pipe is additionally provided with the valve, the caliber of the bypass pipe can be adjusted by controlling the valve, the oil injection quantity can be kept optimal all the time, and the air compressor efficiency achieves optimization.

The invention discloses an external parallel fan turbine engine and application thereof in the field of flying wing aircrafts. The external parallel fan turbine engine comprises a main engine assembly, bypass fan assemblies and a bevel gear transmission assembly; the main engine assembly is a turboshaft engine/turboprop engine; the two or more sets of bypass fan assemblies are symmetrically and externally arranged on the two sides of the main engine assembly; a power turbine shaft of the main engine assembly and fan rotary shafts of the bypass fan assemblies are arranged in parallel; the transmission assembly comprises a main engine built-in transmission assembly and bypass fan built-in transmission assemblies; and the main engine assembly is connected with the bypass fan assemblies through the transmission assembly. Compared with conventional turbofan engines, the high bypass ratio design of the external parallel fan turbine engine can be achieved under a small engine height dimension, fuel consumption can be reduced, and the external parallel fan turbine engine is suitable for providing propulsion power for the flying wing aircrafts as blended wing bodies and is a power device with great potential for the new generation of passenger aircrafts with blended wing bodies.

The invention discloses a device for deep aeration in an integrated oxidation ditch. The device comprises an integrated oxidation ditch body, a plurality of medium-deep aerators and an underwater propeller, wherein an anaerobic reaction tank, an anoxic reaction tank, an aerobic reaction tank and a sedimentation tank are sequentially arranged in the integrated oxidation ditch body in the sewage flowing direction; the medium-deep aerators are horizontally mounted at 1.3-1.7 m away from the bottom of the aerobic reaction tank; the medium-deep aerators are connected with an aeration blower by aeration air supply pipelines; the underwater propeller is vertically mounted in the aerobic reaction tank; the cable of the underwater propeller is connected with a power supply by a guide rod. The invention further provides a method for medium-deep aeration in the integrated oxidation ditch. The aeration time in the wastewater treatment process is prolonged, the flow patterns and the hybrid reaction states in the reaction tanks can be controlled more effectively, and energy consumption caused by aeration and flow pushing is greatly reduced; great convenience is provided for maintenance and replacement of underwater equipment, the service water depth is increased, and the building occupied area is reduced.

The invention discloses a method for heating primary air with heat of a flue gas bypass of a tri-sectional air preheater. The method comprises the steps as follows: hot boiler flue gas enters a main hot flue gas path and the hot flue gas bypass through a hot boiler flue gas inlet respectively; the hot boiler flue gas enters a shell-and-tube primary air heat exchanger through the flue gas bypass toheat cold primary air entering the shell-and-tube primary air heat exchanger through a cold primary air inlet, the heated cold primary air becomes hot primary air, and the hot primary air flows out of a hot primary air outlet; the hot boiler flue gas enters a flue gas bin of the tri-sectional air preheater through the main hot flue gas path to heat cold secondary air; the cold secondary air enters a primary air bin and a secondary air bin of the tri-sectional air preheater through a cold secondary air inlet respectively for heating, and the heated cold secondary air flows out of a hot secondary air outlet. With the method, the air leakage rate of the tri-sectional air preheater is reduced, the exhaust gas temperature is reduced, then the boiler efficiency can be improved, and the coal consumption is reduced.

The invention relates to an oil-free pendulum type air compressor, which prolongs the working time, reduces the temperature of lubricating oil for a transmission mechanism by 20 DEG C, changes an air inlet flue from a single cavity to double cavities, reduces pulse action, and greatly improves the service life of components. The oil-free pendulum type air compressor comprises a body shell, a crank case, a connecting rod, a rotor, a cylinder, a valve, a sensor and a belt pulley. A crank shaft is arranged on the body shell; the connecting rod is arranged on the crank shaft; the other end of the connecting rod is arranged at one end of a shaft of the rotor; the rotor is arranged in the cylinder; and one end of the crank shaft is provided with the belt pulley, and the other end of the crank shaft is provided with sensor shaft of a sensor motor. The oil-free pendulum type air compressor is characterized in that the connecting rod is arranged on the crank shaft through a pin shaft; a rolling bearing is arranged between the connecting rod and the pin shaft; a plurality of concave parts are evenly distributed on the connected end surface of a connector between the cylinder and the body shell; and the cylinder and the body shell are reserved with an air inlet respectively, and the front end of the air inlet is provided with an air filter. The oil-free pendulum type air compressor is applicable to a cement bulk truck, and also can be used for other devices.

The invention discloses a low-pressure steam generating system for a scalding pool, which includes a scalding pool, a blower and a low-pressure steam generator. The water inlet pipe for providing hot water; the low pressure steam generator is also connected with a water outlet pipe; the blower is arranged at the front end of the low pressure steam generator, or between the low pressure steam generator and the scalding pool, or is arranged in the gas inside the low pressure steam generator. on the way. By changing the stirring and replenishing method of the scalding tank, the consumption of heating steam is reduced, and the production cost and operation cost are reduced.