1072 results about "Electromagnetic flowmeter" patented technology

An electromagnetic flowmeter assembly is described in which an excitation field is set up across a flow conduit and electrodes are used to sense the electromagnetic field generated across the flow conduit as a result of interaction between the excitation field and fluid flowing along the flow conduit. The signals obtained from the electrodes are processed, together with stored calibration data, by processing circuitry to determine flow measurements and means is provided for dynamically updating the calibration data.

A apparatus 10,110 is provided that measures the speed of sound and / or vortical disturbances propagating in a fluid or mixture having entrained gas / air to determine the gas volume fraction of the flow 12 propagating through a pipes and compensating or correcting the volumetric flow measurement for entrained air. The GVF meter includes and array of sensor disposed axially along the length of the pipe. The GVF measures the speed of sound propagating through the pipe and fluid to determine the gas volume fraction of the mixture using array processing. The GVF meter can be used with an electromagnetic meter and a consistency meter to compensate for volumetric flow rate and consistency measurement respective, to correct for errors due to entrained gas / air.

The invention discloses a DSP-based electromagnetic flowmeter signal processing system, which comprises a hardware system and a software system. The hardware system consists of an excitation driving module, a signal modulation and acquisition module, a signal processing control module, a man-machine interface module, a communication module and a power supply management module. The signal control module uses DSP as a core. In the system, a high frequency square wave excitation control scheme is adopted, and the DSP generates an excitation time sequence to control the excitation driving module to perform high frequency square wave excitation of a magnet exciting coil; the signal modulation and acquisition module amplifies and filters an output signal of an electromagnetic flowmeter, performs the analog-to-digital conversion of the output signal and outputs the output signal to the DSP; the software system processes an acquired signal to obtain a flowmeter measurement result and send the result to a liquid crystal display; and the parameters of the flowmeter are set by keyboard operation or by the interaction between a master computer and the flowmeter by the communication module. The system can realize the high-accuracy and high-speed measurement of fluid flow, particularly the measurement of flow of liquid-solid two-phase fluid such as pulp.

An improvement over conventional electromagnetic flowmeters which signal a measure of flow rate by controlling the current in a current signalling loop (also known as a sensing loop) and in which power for the flowmeter is derived from the current in the signalling / sensing loop. Conventional electromagnetic flowmeters use a standard current range (typically 4-20 mA), in which zero flow is indicated by controlling the current in the loop to a minimum predeterimened value and maximum flow is indicated by controlling the current to a maximum predetermined value. In the improved flowmeter of the invention, minimum flow is signalled by maximum current in the signalling / sensing loop and maximum flow is signalled by minimum current. This has been found to enable improved accuracy to be obtained at low flow rates without requiring complex flowmeter circuitry.

The invention discloses a testing device and a testing method for a three-dimensional PIV (Particle Image Velocimetry) internal flow field testing system of a hydraulic retarder. The testing device comprises a driving motor, a transmission case, a pneumatic clutch, a flywheel case, a torsion and rotating speed sensor, a braking shaft, a visualized hydraulic retarder, a visualized testing chamber, a circular guide rail, a synchronizer, a double-pulse laser, CCD (Charge Coupled Device) cameras, a water storage tank, a water pump, a pressure inductor, a pressure reducer, a particle dispenser, an electromagnetic flowmeter and the like; the visualized testing chamber is made of a transparent material and is suitable for an aqueous medium; the braking shaft is driven by an external driving system, is supported by a bearing, passes through a shell of the hydraulic retarder and is connected with a driving wheel of the retarder; the first CCD camera is arranged at the top of the visualized testing chamber and is used for shooting downwards; the second CCD camera and the double-pulse laser are arranged on the circular guide rail and can arbitrarily rotate along the guide rail; and the circular guide rail and the visualized testing chamber are respectively fixed on the base. The testing device and the method disclosed by the invention can be used for carrying out three-dimensional PIV measurement on the internal flow field of the hydraulic retarder and is simple and compact in structure, good in universality and easy to control.

The invention discloses a simulation test system integrating the start, movement and accumulation of debris flow, including an instrument table, a water supply system, a control center, a pipeline and a water distribution system, a receiving line, an electromagnetic flowmeter, a water guide pipe, and a raindrop simulation system. Sprinklers, rain sensors, source tanks, porometers, matrix suction probes, soil moisture probes, flow tanks, flow rate test devices, impact test devices, stacking plates, tailing tanks, lifting systems and digital acquisition systems. The invention can combine the two types of mud-rock flow caused by rainfall and water erosion for research, and simulate the real rainfall process; it can effectively monitor the key parameters in the mud-rock flow experiment process, and simulate the whole process of mud-rock flow initiation, migration and accumulation.

The invention relates to a mono-dual frequency electromagnetic flowmeter excitation control system based on linear power supply, comprising a constant current source circuit, a current bypass circuit,an exciting coil driving circuit, an excitation time sequence generating circuit and a galvo circuit. A high voltage power supply is adopted for supplying power, the constant current source is constructed by linear power supply to supplying electricity for the exciting coil driving circuit, the current bypass circuit is jointed in parallel with the input / output end of the linear power supply to solve the problem of energy dissipation, the exciting coil driving circuit is composed of an H bridge and a control circuit thereof, the galvo circuit is bridge-jointed between the lower end of the H bridge and a reference ground, and a digital signal processor (DSP) is used for controlling multiple switches and an electrical level matching device to generate time sequence and control the action ofthe exciting coil driving circuit. The excitation control system can obviously improve excitation frequency range and excitation frequency preciseness, is suitable for single frequency high frequencysquare wave excitation or dual frequency square wave excitation, and can simultaneously provide more exact current detection to correct the flow signal processing result.

The invention discloses a liquid sodium metal thermohydraulic experimental loop system. The loop system comprises a sodium filling system, a loop body, a vacuum system, an argon system and a glove box, wherein the sodium filling system comprises a sodium fusion tank and a sodium filter; the loop body mainly comprises a sodium storage tank, a pump box, a main electromagnetic pump, an auxiliary electromagnetic pump, a preheater, a test section, a radiator, a calibration barrel and a cold trap; and the glove box mainly comprises a sodium sampling analysis device. By the system, sodium filling operation can be realized, liquid sodium metal heat transfer flow characteristics are analyzed, liquid sodium metal is purified on line, an electromagnetic flowmeter is calibrated, and multiple functions of sampling analysis, detection and the like of the liquid sodium metal are realized.

The invention relates to a high / low voltage switching excitation system of an electromagnetic flowmeter with a bypass and an energy feedback circuit. The excitation system comprises an adjustable low voltage source circuit, a high / low voltage switching circuit, a constant-current circuit, a bypass circuit, an H-bridge excitation circuit, an excitation control circuit, a logic switching circuit, apower supply detection circuit, the energy feedback circuit and an energy leakage circuit. A practical excitation current detected on a current detecting resistor is compared with an excitation current threshold set in the logic switching circuit, thereby obtaining a control logic which is used for controlling the high / low voltage switching circuit and the bypass circuit, so as to select an excitation work voltage; introduction of the bypass circuit accelerates the response velocity of the excitation current in a coil obviously; the energy feedback circuit stores the energy fed back from an excitation coil; the power supply detection circuit, the energy leakage circuit and a switching protection circuit perform electrification, outage and error protection on the excitation system. The excitation system related to the invention improves the utilization rate of power supply, accelerates the response speed of excitation current, broadens the range of excitation frequency and provides circuit fault protection.

The invention relates to a multiphase flow erosion local corrosion testing apparatus. The testing apparatus comprises an ore pulp pump, a slurry tank, a stirrer, a pressure gage, an electromagnetic flowmeter, a pipe flow erosion pipe section, a jet flow erosion pipe section, a thermocouple and a low temperature constant temperature circulator. The testing apparatus is characterized in that the stirrer is arranged above the slurry tank, the thermocouple is mounted in the slurry tank and is connected with the low temperature constant temperature circulator, the bottom end of the slurry tank is connected with the ore pulp pump through a feed pipe, a ball valve is installed on the feed pipe, an outlet pipe of the ore pulp pump is provided with a first stop valve and is divided into two paths through the stop valve, one path returns to the slurry tank after passing through a second stop valve, and the other path returns to the slurry tank after passing through the pressure gage, the electromagnetic flowmeter, the pipe flow erosion pipe section and the jet flow erosion pipe section. According to the invention, characteristics of pipe flow and jet flow erosion-corrosion testing machines are combined, pipe flow erosion and jet flow erosion local corrosion tests can be simultaneously or individually carried out, and the testing apparatus has the characteristics of a small size, a simple structure, low manufacturing cost and good operationality.

The invention discloses a liquid metal sodium boiling two-phase thermal-hydraulic test loop system and a test method thereof. The loop system is divided into three parts comprising a high temperature part, a low temperature part and an argon branch, wherein the low temperature part comprises a sodium storage tank, an electromagnetic pump, an electromagnetic flowmeter, a purification cold trap, four sodium valves and corresponding connecting pipelines; the low temperature part is made of 316L stainless steel; the high temperature part comprises a regeneration heater, a preheater, a test section, an upper expansion box and corresponding connecting pipelines; the high temperature part is made of Incoloy 800 and allows the operating temperature to reach 1,200 DEG C; and the argon branch comprises an argon bottle, an expansion pressure stabilizing box, a vacuum pump, three pressure gauges, ten vacuum diaphragm valves and corresponding connecting pipelines. The system is suitable for operating at high temperature, has a good sealing property and can realize analysis and research on the liquid metal sodium boiling two-phase heat exchange flow characteristic by adding different test sections and a data acquisition system.

The invention discloses a multi-electrode electromagnetic flow meter and relates to the technology field of measurement. The flow meter comprises six electrodes arranged on the circular cross-section of a sensor conduit, the sensor conduit is perpendicular to the central axis of the conduit, wherein, four electrodes are measuring electrodes that are symmetrical about the X-axis and the Y-axis of the circular cross-section, and two electrodes are liquid collecting electrodes. Two measuring electrodes are in a group, the two liquid collecting electrodes are arranged between the two groups of measuring electrodes. The two measuring electrodes in a group are reliably connected. The two groups of measuring electrodes are respectively connected with a converter and an amplifier. The two liquid collecting electrodes are reliably connected and then connected to the metal of a measuring conduit, and serve as the basis ground of flow signals for connecting the ground terminal of the converter and the amplifier. The multi-electrode electromagnetic flow meter is characterized by small additive measuring error, convenient assembly and reliable liquid collecting reference, and can provide the reliable ground reference electrical potential.

A magnetic flowmeter transmitter includes a differential amplifier that senses an additive combination of actual flowmeter electrode outputs and simulated electrode outputs. The differential amplifier provides an additive amplifier output. A simulator provides the simulated electrode outputs. The simulator senses the additive amplifier output and provides an error indication when the additive amplifier output is outside a normal range.

The present invention discloses a capacitive electromagnetic flowmeter. The upper side and the lower side of the outer wall of a measuring tube are provided with an upper coil and a lower coil which are in series connection; the upper coil and the lower coil are connected with an exciting circuit; the left side and the right side of the outer wall of the measuring tube are provided with a left detecting electrode and a right detecting electrode; a left shielding electrode, a right shielding electrode, a left shielding ring and a right shielding ring are arranged outside the left detecting electrode and the right detecting electrode; the left detecting electrode is connected with a left preamplifier; the right detecting electrode is connected with a right preamplifier; the left preamplifier and the right preamplifier are connected with a differential amplifying circuit and a signal processing circuit. In the signal processing circuit of the invention, a rotary capacitance filter circuit has the effect close to an ideal square wave matched filter and can overcome the influence of strong noise, improve signal-to-noise ratio, detect feeble flow signals and convert the feeble flow signals to the direct current signals along flow changing, thereby achieving the measurement on fluid flow.

An electromagnetic flowmeter for measuring a flow rate of a fluid in a pipe is described. A pipe carries a fluid. A magnetic coil is disposed adjacent to the pipe for inducing a magnetic flux in the fluid. A plurality of electrodes are disposed within the pipe, and the plurality of electrodes are electrically isolated from one another. Measurement circuitry is coupled to at least one of the plurality of electrodes and is configured to measure flow rate as a function of a potential across the plurality of electrodes. An empty pipe detector is coupled to at least one of the plurality of electrodes and is adapted to detect an empty pipe condition based upon an adjustable test criteria. In one embodiment, a local operator interface is coupled to the empty pipe detector for adjusting the adjustable test criteria.

The invention relates to a method for measuring the flow rate of conductive liquid in a partially filled pipe, which is characterized in that, a level detection method for the conductive liquid and a flow rate measuring method of an electromagnetic flowmeter are combined, so that the liquid level L and an average flow velocity V are obtained based on an electric potential signal X-value formed from two signal-testing electrode units and by controlling signal-transmitting electric potential and excitation, and a corresponding flow rate Q-value in a partially filled pipe is obtained; at the same time, a system structure is proposed, wherein electrode groups configurated by distributing more than two electrodes on each side of an inner wall of a measuring pipe are used as signal testing electrodes, all the electrodes of each electrode group are in parallel connection outside the measuring pipe to form an output end, so that a potential signal X is formed on the output ends of the two signal testing electrodes, thereby avoiding processing and mounting difficulty of long arc electrodes, simplifying the system structure of a multi-electrode electromagnetic flowmeter for a partially filled pipe, and improving the performance to price ratio.

An electromagnetic flow meter has a pipe body 16 in which a measurement target fluid flows. The pipe body 16 includes: a measurement pipe 1 having a groove 3 whose cross-section is any of a semicircular shape, a rectangular shape, and a triangular shape formed on an inner surface in a circumferential direction; and a resin lining portion 10a formed on the inner surface of the measurement pipe.

The invention is a method of testing and regulating oil-field layered injected water flow, and its characteristic: putting down flow testing and regulating meter to butt with regulable flow stopper in the deviation hole of an eccentric water distributor, and then measure the actual flow by an electromagnetic flowmeter in the flow testing and regulating meter and then sending the measured result through the cable to a ground control system, comparing the measured signal with the water injection set signal for the layer by the ground control system: if they do not tally with each other, it sends a control instrument to regulate water injection to the flow testing and regulating meter to drive a regulating rod on the flow stopper for regulating the size of water outlet by the butt joint, and then achieving the purpose of regulating water injection. The invention has the characters of high testing precision and short time for testing and regulating.

An integral trap magnetic flowmeter having an inlet in fluid communication with a sensing passage, the sensing passage intersecting a magnetic field, having electrodes for detecting a flow-dependent voltage induced by the passage of conductive liquid through the magnetic field, and having an outlet at an elevation such that the sensing passage volume normally remains filled with conductive liquid. By maintaining standing liquid in the sensing passage at a height sufficient to fill the sensing passage volume, the flowmeter's response may be made more rapid and more accurate, particularly during the early stages of a short duration liquid discharge. By providing an integral trap, installation errors may be reduced.

An electromagnetic flowmeter includes a measuring tube, an electrode, an exciting unit, a signal conversion unit, and a flow rate calculating unit. The signal conversion unit extracts a ∂A / ∂t component irrelevant to a flow velocity of the fluid and a v×B component originating from the flow velocity of the fluid from a resultant electromotive force of an electromotive force ∂A / ∂t, with A, t, v, and B respectively representing a vector potential, a time, a flow velocity, and a magnetic flux density. The flow rate calculating unit extracts a variation component dependent on a parameter from the ∂A / ∂t component, corrects a span which is a coefficient applied to a magnitude V of the flow velocity of the v×B component, and calculates the flow rate of the fluid from the v×B component whose span is corrected.

An electromagnetic flowmeter with voltage-amplitude conductivity-sensing function for a liquid in a tube includes a first microprocessor, a transducer, flow-sensing device, an exciting-current generating device, a voltage-amplitude conductivity-sensing device, and a switch. The transducer includes coils and sensing electrodes. The switch is electrically connected to the first microprocessor and the sensing electrode. The switch is selectively connected to the flow-sensing device or the voltage-amplitude conductivity-sensing device according to the signals sent from the microprocessor. The microprocessor makes the exciting-current generating device to generate an exciting current when the switch is connected to the flow-sensing device. The microprocessor makes the exciting-current generating device to stop generating exciting current and computing conductivity of liquid when the switch is electrically connected to the voltage-amplitude conductivity-sensing device.

The present invention is intended to achieve measurement of electrode impedance that is not easily affected by fluid noise, and to accurately detect adhesion and discriminate the type of fluid. An electromagnetic flowmeter that is provided with a pipe through which the fluid to be measured is passed, applies a magnetic field to the above fluid driving the excitation coils using the excitation circuit, and thereby measures the flow rate of the fluid passing through the above-mentioned pipe; further comprising: a pair of detecting electrodes that detect the flow signal corresponding to the flow rate of the fluid passing through the above-described pipe, an earth electrode whose potential becomes the reference potential when the flow rate is measured, diagnosing signal generators that apply the diagnosing signals between the above detecting electrodes and the above earth electrode, and a diagnosis circuit to detect the resistance values between the above detecting electrodes and the above earth electrode as diagnostic signals.

The invention relates to a experimental system for scientific research, in particular to a pipeline leakage detecting and positioning experimental system and a detection method thereof, and the system is used for realizing detection and positioning experiments on leakage of long-distance gas conveying pipelines and long-distance liquid conveying pipelines by virtue of different leakage detection methods. The pipeline leakage detecting and positioning experimental system comprises a conveying pipeline, a medium conveying device, a negative-pressure wave detection device and an acoustic emission detection device; the medium conveying device comprises a conveying pipeline, a medium container, a surge tank, a water pump, an oil pump, a water tank outlet flowmeter, a water tank inlet flowmeter, an oil tank outlet flowmeter, an oil tank inlet flowmeter, a nitrogen cylinder outlet valve, a water tank outlet valve and an oil tank outlet valve; a bent part of the conveying pipeline is of a U-shaped pipeline, and the rest part of the conveying pipeline is a straight pipeline section; the negative-pressure detection device comprises a pressure sensor, an electromagnetic flowmeter, a data acquisition card and a computer; the acoustic emission detection device comprises an acoustic emission sensor, a signal preamplifier, an acoustic emission detection instrument and a computer; the acoustic emission detection instrument is used for processing signals, and transmitting the signals to the computer of the acoustic emission detection instrument so as to analyze the signals.

The invention relates to an ultrafast cooling device for large rolled H-shaped steel, belonging to the technical field of production control and cooling for high-performance H-shaped steel.The invention provides a ultrafast cooling device for large rolled H-shaped steel, which can enable the H-shaped steel to obtain good texture and mechanical property.The cooling device comprises a rail support of a transverse rail, which is fixed at the upper part of the device, a cooling unit provided with a cooling rack, which is arranged on the transverse rail and a transverse roller wheel which is arranged below the cooling rack; wherein the cooling unit comprises a lateral nozzle unit, an upper nozzle unit and a side board provided with a groove; the side board is arranged on the cooling rack, a lateral nozzle tank body is fixed outside the side board; and an upper nozzle unit is arranged above the inside of the side board, a lower nozzle unit is arranged on a motor base of a conveying rail, the lower nozzle unit is connected with a water supply pipe; an electromagnetic flowmeter, a pressure sensor and a pneumatic open and close valve are respectively on the water supply pipe and thermodetectors are respectively arranged at the entrance and exit of the ultrafast cooling device.

An electromagnetic flowmeter includes a coil, exciting section, noise eliminating section, and arithmetic processing section. The coil applies a magnetic field to a fluid flowing in a pipe line. The exciting section supplies an exciting current to the coil. The noise eliminating section eliminates noise from a measurement signal detected from the fluid under excitation by using a differential frequency component between a commercial power frequency and an exciting frequency. The arithmetic processing section calculates a measurement flow rate on the basis of the measurement signal output from the noise eliminating section.

The invention discloses a capacitive electromagnetic flow signal converter. Two E-shaped magnetic yokes are adopted and are combined together face to face at the position of an opening so as to form a closed loop, and therefore working magnetic field leakage can be effectively prevented. Meanwhile, according to the two E-shaped magnetic yokes which are formed by stacking E-shaped silicon steel sheets, excitation coils are wound on stretching-out portions in the middles of the E-shaped magnetic yokes, two Helmholtz coils are connected in series and arranged coaxially, and the Helmholtz coils are identical in shape, size and number of turns. After excitation signals are input into the Helmholtz coils which are connected in series, an even working magnetic field with the magnetic field intensity changing along with excitation sinusoidal signals can be generated between excitation devices, due to the fact that the generated working magnetic field is even, the magnetic permeability of the silicon steel sheets is very good, the magnetic field at the position of a measuring pipe is very strong, the sensitivity of flow detection is also improved, so that fluid flow can be effectively converted into electric signals to be output, and the fluid flow measuring accuracy of a capacitive electromagnetic flow meter is further improved.

In a borehole logging tool, the flow of conductive fluid into or out of a wellbore at the wellbore wall is detected and measured with a sensor loop proximate the borehole inner wall. The sensor loop includes a series of contiguous sensors that act as electromagnetic flowmeters and provide fluid measurements covering the entire circumference of the sensor loop. The sensor loop includes an elastic element that forces the sensor loop outward to maintain pressure along the sensor loop circumference against the interior borehole wall. The sensor loop is designed to lie at a non-perpendicular angle to the wellbore axis, and mechanical arms press the top and bottom of the loop against the borehole inner wall.

A magnetic flow meter includes a flowtube arranged to receive a flow of process fluid and a coil proximate the flowtube arranged to apply a magnetic field to the process fluid. A sense electrode is arranged to sense a voltage potential in the flowtube in response to the applied magnetic field. The sensed voltage is indicative of flow rate of process fluid through the flowtube. Diagnostic circuitry provides an output related to an electrical path between the coil and electrical ground.

The invention discloses an automatic start-stop and exposure intensity control ultraviolet disinfection device. The disinfection device mainly comprises an electromagnetic flowmeter, a water quality instrument, an ultraviolet sterilizer, ultraviolet lamp tubes, a controller, a water inlet pipe, a sensor and a water outlet pipe. Water flows through the water inlet pipe to penetrate through the electromagnetic flowmeter and then flows into the ultraviolet sterilizer through the water quality instrument, the ultraviolet sterilizer includes the ultraviolet lamp tubes, the sensor is installed on the water outlet pipe, and the controller is connected with the electromagnetic flowmeter and the sensor through leads. The disinfection device can achieve automatic ultraviolet sterilizer starting and stopping functions when water flows and stops, meanwhile can also control ultraviolet light exposure intensity according to water flow and water quality characteristics, accordingly can more intelligently water disinfection and can further play an energy-saving effect.

The invention discloses an intelligent circulating prestress mud jacking system and a control method thereof. A pressure compensation device is arranged on a mud jacking pipeline between a mud jacking pump and a mud inlet and comprises a piston and an elastic mechanism, wherein the end of the piston is communicated with the mud jacking pipeline, and the elastic force of the elastic mechanism drives the end of the piston to be pressed into the mud jacking pipeline. Pressurizers are arranged at the positions of the mud inlet and a mud outlet respectively to control the quantity of mud entering the duct of a beam component and the quantity of mud discharged from the duct of the beam component respectively. Electromagnetic flowmeters are arranged at the positions of the mud inlet and the mud outlet respectively to acquire flow signals of the mud inlet and the mud outlet. Two sets of mud jacking pump plungers are arranged to achieve mud jacking alternately, water and cement ratio control is achieved in a closed-loop control mode, and an effective circulation pressure value, a dwell pressure value, a lower dwell pressure limiting value and an upper dwell pressure limiting value and a dwell time value are set to control components and mud. The system has the advantages that mud pressure is stable, jacked mud is dense, and the quality of components is high.