54 results about "Streamflow" patented technology

The invention relates to a multi-vehicle working air line planning method and system of plant protection unmanned aerial vehicles and a spraying working method and system of the plant protection unmanned aerial vehicles. The planning method comprises the steps that a snake-shaped air line of the plant protection unmanned aerial vehicles during farmland spraying working is planned according to farmland coordinate parameters; the unmanned aerial vehicles are ranked according to the take-off sequence, and the spaying cut-off points of the unmanned aerial vehicles in the snake-shaped air line are calculated according to the sequence and the spraying flow and flying speed of each unmanned aerial vehicle; the starting point and cut-off point of each unmanned aerial vehicle are sent to the corresponding unmanned aerial vehicle to set the flight line, and the spraying cut-off point of the former unmanned aerial vehicle serves as the spraying starting point of the next unmanned aerial vehicle entering the air line. The errors of the planned air line are small, the flight effect of the unmanned aerial vehicles is good, multi-vehicle collaborative working can be achieved, the intelligent degree of spraying working is high, and the working efficiency of the unmanned aerial vehicles is improved.

The invention discloses an intelligent rainwater system based on runoff simulation and multi-sensor monitoring, and an operation method. The system comprises a runoff simulation and control host basedon a GIS, a meteorological forecast and runoff satellite monitoring server, a distributed small meteorological station, a vertical surface rain condition monitor, a movable rainfall radar, an infrared video monitor, an evaporation measuring instrument, a rainwater pipe network flow monitor, a water quality online monitor, an air quality monitor, a radar rainfall monitor, an infiltration area saturation monitor, an accumulation area water level monitor, a shallow-layer underground water level monitor, a surface runoff monitor, a waterproof unmanned aerial vehicle with a speed measuring buoy, an optical fiber temperature sensing system, an optical fiber pressure sensing system, a communication module, an intelligent controller, a rainwater utilization facility water supply point, a high-position rainwater hydroelectric generation module, a submersible conveying pump, a pressurization infiltration device and the like. According to various parameters, the rainfall flood disasters are subjected to scientific early warning and warning, and measures are adopted, so that the disaster risk of rainfall flood disasters to a building area or a building can be reduced.

A fluid flow rate control method is provided that uses a flow rate range variable type pressure type flow rate control device provided with at least two or more parallel fluid passages disposed between the downstream side of a control valve of the control device and a fluid supply pipe passage, and orifices having different fluid flow rate characteristics are respectively interposed in parallel fluid passages to pass fluid in a first flow rate region through one orifice for flow rate control, and to pass fluid in a second flow rate region through at least another orifice for flow rate control. Flow rate characteristics of the respective orifices are selected so that a maximum controllable flow rate of fluid in the first flow rate region at low flow rate is smaller than 10% of a maximum controllable flow rate in the second flow rate region at high flow rate.

The invention discloses a soot-blowing control device for a boiler furnace based on heat flow online measurement, which comprises a heat flow sensor, a multiplexer, a data collector and an industrial personal computer, wherein the heat flow sensor is arranged on a film-type water wall fin at the periphery of the boiler furnace and connected to the input end of the multiplexer and used for transmitting collected heat flow to the multiplexer; the multiplexer is sequentially connected with the data collector and the industrial personal computer and used for multi-channel switching, signal amplifying and filtering; the data collector is used for converting a heat flow analog signal to a digital signal; and the industrial personal computer is used for analyzing the digital signal transmitted from the multiplexer and sending a soot-blowing signal. The invention can be used for various coal-fired power plants; and according to fouling conditions of heating surfaces in each region of the boiler furnace, realizes the sweeping in a demand quantity for the required region, improves the accuracy and the real time of fouling diagnosis for the heating surfaces of the boiler furnace, reduces the boiler failure, prolongs the lifetime of a soot-blower, saves the maintenance workload of the soot-blower, and the like.

The present invention relates to an apparatus for field-flow fractionation and to a method for separating samples by means of field-flow fractionation using this apparatus. The apparatuses of the invention comprise one or more reservoirs, a pump, a first flow volume splitting device, two valves for flow control, an injector, a separation channel having a first connector at a first end and a second connector at a second end or an AF4 separation channel having a first connector at a first end, a second connector at a second end and a third connector between the first and the second ends, optionally a second flow volume splitting device, a back-pressure element, one or more detector(s), a flow volume control device and one or more waste container(s). The apparatuses of the invention are characterized in that they comprise a valve for flow control in a first flow path and a second flow path which connect the pump to the first or the second or the third connector of the separation channel and that these valves are switched alternately in a controllable time ratio.

The invention relates to a multi-functional constant flow control valve used for flow adjustment and automatic control. The multi-functional constant flow control valve includes a valve body which is provided with a valve cover at the upper portion and a sewage draining exit at the lower portion. The valve cover is provided with a valve shaft at the center. The valve shaft is provided with an adjusting valve clack at the lower portion. A valve pocket, a differential pressure receptor and a bi-seat valve clack with a function of compensating the differential pressure are arranged inside the valve body. The valve pocket, the differential pressure receptor and the bi-seat valve clack with the function of compensating the differential pressure constitute a valve core. Compared with the prior art, the multi-functional constant flow control valve is more reasonable and compact in structure, simple in disassemble and maintenance, visual in flow display, and abundant in function, thus being applicable to more fields.

The invention discloses a mass flowmeter detecting device and a mass flowmeter detecting method. The mass flowmeter detecting device comprises a fluid storage pool, a constant-current constant-pressure pump, a fluid gathering bag and a fluid storage pool return pipe, wherein the constant-current constant-pressure pump is mounted between the fluid storage pool and the liquid inlet end of the flowmeter to be detected; the fluid gathering bag and the fluid storage pool return pipe are mounted at the liquid outlet end of the flowmeter to be detected in parallel, the liquid inlet end of the fluid gathering bag is provided with a first switch electromagnetic valve, and the liquid inlet end of the fluid storage pool return pipe is provided with a second switch electromagnetic valve. The mass flowmeter detecting method is simple and reasonable in steps; the fluid switch and the timing starting and stopping are synchronously controlled by a computer through a software module, so that the fluid mass sampling and the sampling time are synchronized rigidly and correspondingly; and moreover, the mass flowmeter detecting method is simple and effective and is capable of avoiding the problem that the fluid mass loss error and the indication error and timing error due to the fluid flow state fluctuation enable the standard flow rate value to have large error.

Methods and systems are provided for estimating a fuel canister purge flow based on outputs of an intake manifold oxygen sensor. For example, during boosted engine operation when exhaust gas recirculation (EGR) is flowing below a threshold and purge is enabled, purge flow may be estimated based on changes in the sensor output while modulating a canister purge valve between an open and closed position. Then, during subsequent operation wherein EGR and purge flow are enabled, the output of the sensor may be adjusted based on the estimated purge flow.

The invention relates to a synchronous hydraulic transmission system, which consists of four modules, namely a water supply module, a control valve bank, a synchronous hydraulic cylinder group and a water-compensating exhaust module, wherein the water supply module supplies water to the system through a water pump; the control valve bank is a high-flow three-position four-way valve; the synchronous hydraulic cylinder group is formed by connecting a sucker rod cavity of a large hydraulic cylinder and a rodless cavity of a small hydraulic cylinder in series through an intermediate communicating pipeline; and the intermediate communicating pipeline is connected with a pipeline and the water-compensating exhaust module respectively. Adopting tap water as a hydraulic transmission medium, the synchronous hydraulic transmission system has the advantages of energy conservation, environmental protection and accurate positioning, prevents hydraulic oil from polluting water quality, meets the requirements of special application occasions, and can be applied in engineering environment of subaqueous elevating stages, the start and stop of water conservancy gates, shipping machines, mining machines and the like.

A system for improving PCV flow of an engine is presented. The system can reduce engine oil consumption when an engine is exposed to lateral or centripetal force. In one example, the system includes a mechanically operated valve that acts to limit PCV flow in a conduit external to an engine.

The invention provides an online alternating-current flow proportion regulation control device and belongs to the technical field of alternating-current hydraulics. The control device is characterized by comprising a crank, a slider, a connecting rod, a lever, a ball screw, a ball nut, a servo motor, a hydraulic cylinder and the like. The crank in a crank-connecting rod mechanism drives the slider to move through the connecting rod according to the sine rule, and sine rule change is transmitted to a piston of the hydraulic cylinder after being magnified/shrunk by certain times by a lever system composed of the lever, a lever bearing and the like. The piston enables the output end of the hydraulic cylinder to accurately output set alternating-current flow according to the sine rule change magnified/shrunk by certain times, so that real-time dynamic on-line accurate linear proportion regulation of the alternating-current flow is realized. The control device has the advantages that the device is smart in structure, reasonable in layout and high in measurement accuracy, the problem that the alternating-current flow cannot be regulated proportionally online with high precision by traditional crank length changing methods and the like is solved, and good promotional value is obtained.

The invention discloses a simulated accelerated test device and method of acidic marine aerosol-caused influence on steel atmospheric corrosion and belongs to the technical field of a metal material atmospheric corrosion simulated accelerated test. The method utilizes the aerosol simulated test device to carry out an indoor accelerated corrosion experiment. The method comprises preparing a NaCl solution with a concentration of 3.5%, adjusting the solution pH to 3.5 through concentrated hydrochloric acid with a concentration of 38% to obtain an original solution of the acidic marine aerosol, atomizing the solution through adjusting parameters of a solution flow control system and a gas compression system in the device to obtain aerosol liquid drops so that an acidic aerosol environment is simulated, and depositing the aerosol liquid drops on the surface of a sample through a wet settlement method for 4-32 cycles, wherein one experimental cycle comprises a wet settlement process for 10min and a natural drying process for 350min. The method for researching steel atmospheric corrosion through simulated accelerated corrosion can conveniently and fast acquire steel corrosion data in corrosion and determine acidic marine aerosol-caused influence on steel atmospheric corrosion.

The invention relates to the technical field of experiment equipment for an environment engineering laboratory and particularly relates to a laboratory drainpipe network simulation system and a simulation method. A water storage device of the system is connected with a spraying device and supplies quantitative water for the spraying device, the spraying device sprays water to an experiment table arranged below the spraying device, the experiment table is used for simulating a distribution structure of a road drainpipe network and comprises at least two experiment zones, adjustable height difference exists among the experiment zones, the experiment zones are communicated with the water storage device through a water drainage device to return rainwater dropping onto the experiment table to the water storage device through the water drainage device, and a controller is respectively connected with the water storage device, the spraying device, the experiment table and the water drainage device, is used for controlling opening/closing, position adjustment and water flows of the water storage device, the spraying device, the experiment table and the water drainage device and can simulate operation states of underground drainpipe networks with different rain intensities and different surface differences.

The invention provides a vortex throttling integrated gas-liquid two-phase flowmeter and an application method thereof. The flowmeter comprises an intelligent differential pressure flow transmitter and a vortex street throttling measuring device, and the vortex street throttling measuring device is connected to the intelligent differential pressure flow transmitter through a pressure guiding tube.The vortex street throttling measuring device comprises a vortex generating body and a vortex street temperature integrated detecting probe for detecting vortex frequency and fluid temperature. The vortex generating body is installed at the shouting channel position of the vortex street throttling measuring device, and the vortex street temperature integrated detecting probe is inserted into theshouting channel position. The flowmeter integrates the structure of a throttling flowmeter and a vortex street flowmeter deeply, reduces the overall length, simplifies the structure, and makes fluidsmeasured by the vortex street flowmeter and the throttling flowmeter in the same pressure and temperature working condition system to ensure the consistency of the working condition flow rate measured by the two flowmeters and improve the density and gas-liquid flow measurement accuracy of the mixed fluids. At the same time, a vortex street sensor and a temperature sensor are integrated to reducethe number of pipe openings and sensors and further simplify the structure.

The invention discloses a lifting check valve which comprises a valve body, a valve cover, a valve flap and is characterized in that the section of the valve flap is inverted T-shaped; a guide groove is arranged on the valve cover; the top part of the valve flap is arranged in the guide groove and matched with the guide groove; the check valve has the advantages of good seal performance, erosion resistance, safety, reliability, long service life and being adjusted according the flow rate of the medium real-timely.

The invention relates to a distributed type energy system based on demand side energy supply and a control method. The problems that the demand side and the supply side are not matched, and the energyutilization rate at the energy supply valley is low exist in a distributed type energy system, and the overall system energy efficiency is influenced. The distributed type energy system comprises a demand side, prime mover equipment, waste heat refrigeration/heating equipment, waste heat power generation equipment, a smoke flow distributing device, a main control system, a smoke flow distributingcontrol line, a prime mover control line and an energy demand feedback line. The main control system is connected with the prime mover equipment. The prime mover equipment is connected with the smokeflow distributing device. The main control system is connected with the smoke flow distributing device. The smoke flow distributing device is connected with the waste heat refrigeration/heating equipment and the waste heat power generation equipment. The waste heat refrigeration/heating equipment and the waste heat power generation equipment are both connected with the energy demand side, and theenergy demand side is connected with the main control system. According to the distributed type energy system based on demand side energy supply and the control method, the energy supply quantity ismatched with the energy demand quantity, and the energy utilization rate is increased.

The invention provides a single-flow-channel secondary combustion oxygen lance capable of improving the scrap ratio of a converter and an application method of the single-flow-channel secondary combustion oxygen lance. The single-flow-channel secondary combustion oxygen lance comprises a lance body and a spraying nozzle, wherein the lance body comprises a three-layered steel pipe structure composed of a middle pipeline, a middle circumferential seam and a peripheral pipeline; oxygen is introduced into the middle pipeline; cooling water is introduced into the middle circumferential seam; returned water flows out from the peripheral pipeline; a main oxygen spraying hole is formed in an end face of the spraying nozzle; a secondary oxygen spraying hole is formed in a side wall of the sprayingnozzle; the flow of the secondary oxygen spraying hole accounts for 15 to 30 percent of the total oxygen supply flow; the flow of the main oxygen spraying hole accounts for 70 to 85 percent of the total oxygen supply flow. According to the single-flow-channel secondary combustion oxygen lance provided by the invention, the design of the main oxygen spraying hole of the oxygen lance is consistent with that of a conventional traditional oxygen lance; the secondary oxygen spraying hole is formed on the basis of an original spraying nozzle, so that oxygen jet flow sprayed out from the secondary oxygen spraying hole and carbon monoxide in the converter are combusted to generate a lot of heat for heating molten steel under the condition that the jet flow of the secondary oxygen spraying hole andjet flow of the main oxygen spraying hole do not have an entrainment phenomenon and a furnace lining of the converter is not corroded, and the scrap ratio of the converter is improved.

The invention provides a hydraulically controlled frequency stabilization power generating method, which comprises the following steps that: a. an impeller collects flow field energy and the flow field energy is converted into mechanical energy; b. the mechanical energy is transmitted to a parallel-connection pump unit with variable initial phase angles by a power distribution box to be converted into hydraulic energy, and the hydraulic energy is transmitted to a variable hydraulic motor through a current collector; c. a constant speed controller cooperates with a control valve group in a control loop and an electric control variable mechanism in the hydraulic motor to obtain flow entering the hydraulic motor and the optimal matching of displacement of the hydraulic motor, so that the hydraulic motor rotates at constant speed and outputs the mechanical energy, and the mechanical energy is transferred to a generator; and d. the constant-speed stable mechanical energy is converted into constant frequency electrical energy to be output by the generator. The invention adopts a closed hydraulic loop to realize the conversion and long distance transfer of flow field energy, solves the problems that the existing wind power generating device has high cost, difficult constant frequency and voltage regulation, difficult installation and maintenance and the like, and can effectively reduce the construction and operation and maintenance costs of wind power generating equipment.

The invention discloses a device applicable to a pipe washing work of a deep sea oil and gas pipeline. The device comprises a water flushing system, a chemical agent filling system which is connected to the water flushing system, an assisting system which assists the water flushing system to clean the pipeline, and a data acquiring and transmitting system for acquiring and transmitting data of a pipe cleaning device, wherein the water flushing system comprises at least free water flushing and ROV supported water flushing; the free water flushing is that the inner and outer water pressure difference of a seawater pipeline is treated as power to flush water for cleaning the pipe; the ROV supported water flushing is that hydraulic power supplied by a centrifugal pump is used for flushing water to clean the pipe; the chemical agent filling system comprises at least an underwater chemical agent tank, a chemical agent discharging assembly, a chemical agent filling assembly, a chemical agent filtering and adjusting assembly and an underwater rapid chemical agent supplementing joint; and the chemical agent is filled with different concentration and mixing ratio through the chemical agent filling and adjusting assembly based on the flow rate change of a main pipeline. The device overcomes deep water pressure and resistance along the way and reduces the shortages of a large amount of aboveground devices for normal pipe cleaning work, large occupied space, and high input cost; and the deep water pipeline cleaning work efficiency is improved.

Disclosed is a high-flow vacuum generator, which relates to automatic industrial equipment for injection moulding. One end of a diffusion side stand is connected with a vacuum side stand while the other end is connected with a muffler. A diffusion chamber is arranged in the diffusion side stand, and an adsorption chamber is disposed in the vacuum side stand, wherein one end of the diffusion chamber communicates with the adsorption chamber and the other end of the diffusion chamber is connected to the muffler. The diffusion side stand is equipped with a first air tube joint and the vacuum side stand is equipped with a second air tube joint, wherein the air tube joint one communicates with the diffusion chamber and the second air tube joint communicates with the absorption chamber. A clearance formed between the diffusion side stand and the vacuum side stand is used as a nozzle for generating a high-speed jet. According to the invention, the high-flow vacuum generator has a small vacuum capacity, quick response, light weight, low noise, small vacuum, and a high flow. The high-flow vacuum generator is designed of a tubular shape, is flexibly connected to a clamp plate, is higher in taking-out accuracy and high in taking-out speed, has a vacuum breaking function, and is able to convert vacuuming into blowing. When a product is taken out by a clamp and the product needs to be released, the product can be blew out quickly.