829 results about "Electromagnetic flow" patented technology

The invention relates to an automatic milk powder brewing machine which comprises a milk powder machine body, a milk powder machine base, an overturning cover, a milk powder brewing device, a display screen and a control device. An opening is formed in the upper end of a cavity of the milk powder machine body, the milk powder machine base is used for supporting the milk powder machine body, the overturning cover with a lock catch is arranged on the opening in the upper end of the milk powder machine body, the display screen is arranged on the front end face of the milk powder machine body, the control device is arranged inside the milk powder machine body, and the display screen is connected to the input end of the control device. The milk powder brewing device is arranged in the cavity of the milk powder machine body and comprises a milk powder tank, a water tank with a heater, a constant-temperature bottle, a quantitative milk powder adding device, an electromagnetic flow device and a stirring bottle, the quantitative milk powder adding device is arranged at the bottom of the milk powder tank and connected with the stirring bottle, and milk powder in the milk powder tank is conveniently fed into the stirring bottle for stirring according to certain quantity. By means of the automatic milk powder brewing machine, full-automatic milk brewing can be achieved; the water temperature during milk and the brewed milk temperature brewing can be accurately controlled, the brewed milk powder amount and the water amount are accurately controlled, and the concentration is guaranteed.

The invention discloses a movable arm flow re-generation system with a potential energy recovery device for an excavator, and belongs to the technical field of engineering mechanical equipment. The system comprises a movable arm hydraulic cylinder, a three-position four-way servo valve, a controller, an overflow valve, an electromagnetic flow valve, a one-way valve, a variable output pump, an oil tank and an engine; the controller is electrically connected with the servo valve, the electromagnetic flow valve and the variable output pump; the three-position four-way servo valve is sequentially connected with a reversing valve and a hydraulic motor; the hydraulic motor is axially connected with a power generator; an output end of the power generator is electrically connected with a super capacitor; the outlet pressure of the hydraulic motor is controlled by the electromagnetic flow valve through the one-way valve of the motor; the reversing valve is connected with the oil tank; and the controller is electrically connected with the reversing valve, the power generator and the hydraulic motor. By the system, the optimal energy-saving state of the excavator can be realized during the falling of a movable arm, the energy consumption of the hydraulic system is reduced, the utilization ratio of the energy is improved, and the service life of the excavator is prolonged.

The invention relates to an electromagnetic flow meter excitation control system based on high and low voltage power switching, comprising a high voltage power and a low voltage power, a power switching circuit, a constant-current control circuit, a filed coil driving circuit, a current detecting circuit and an excitation timing sequence generation circuit. An excitation working power is provided by switching the high voltage power and the low voltage power via the power switching circuit according to excitation current response situation in a time sharing manner so as to quicken the response speed of square wave excitation current and improve power utilization ratio; the constant-current control circuit supplies power to the filed coil driving circuit so as to cause the steady-state value of the excitation current to be constant; the filed coil driving circuit is composed of an H bridge and a control circuit thereof to realize square wave excitation; the current detecting circuit is bridged between the lower end of the H bridge and reference ground; and the excitation timing sequence generation circuit is mainly composed of an processing core MCU for processing the signals of the electromagnetic flow meter, and the like. The excitation control system can obviously enhance the range of excitation frequency, lower circuit energy consumption and improve power utilization efficiency in the condition of ensuring the stable zero point of the electromagnetic flow meter, so as to be applicable to accuracy measurement of size fluid.

The invention discloses an MR polishing slurry cycle device which has longtime and stable polishing slurry performance. The liquid mixture tin is connected with the water tank through a metering pump and the cooling machine is connected with the liquid mixture tin through the cooling pipe; a polishing slurry circulation loop consists of the successively connected liquid mixture tin, electromagnetic flow meter, nozzle, recovery unit and recovery pump through a polishing circulation pipeline and a non-polishing slurry circulation loop consists of the successively connected liquid mixture tin and electromagnetic flow meter through a non-polishing circulation pipeline. The polishing slurry circulation loop and the non-polishing slurry circulation loop are connected in parallel and a switching control valve is arranged at the junction. The lateral pipe between the liquid mixture tin and the switching control valve is surrounded with spiral coil; the electromagnetic flow meter and the spiral coil are connected with the input terminal of the computer, of which the control output terminal is connected respectively with the switching control valve, the cooling machine, the power pump and the metering pump. The device has the advantages of high control precision, sound stability, etc., and can provide low cost, reliable and stable MR polishing slurry for MR polishing processing for a long time.

The invention discloses a greenhouse seedling culturing, irrigating and fertilizing integrated system which comprises a water supply system, a fertilizer infusing system, a sensor water fertilizer detection device and a PLC (Programmable Logic Controller) control system, wherein the fertilizer infusing system is respectively connected with the water supply system and a fertilizer storage tank; the water supply system is connected with an irrigating pipeline system by virtue of a main pipeline; the water supply system comprises a water pump and a main pipeline; the main pipeline is provided with a filter; the main pipeline is respectively provided with pressure gauges and an electromagnetic valve switch; the fertilizer infusing system comprises a fertilizer mixing tank; the pipeline is provided with an electromagnetic flow regulator and a fertilizer infusing electromagnetic valve switch; the PLC control system is respectively connected with an HMI (Human Machine Interface), the sensor water fertilizer detection device, the front pressure gauge, the rear pressure gauge, the front electromagnetic valve switch of the main pipeline, the rear electromagnetic valve switch of the main pipeline, the electromagnetic flow regulator and the fertilizer infusing electromagnetic valve switch.The greenhouse seedling culturing, irrigating and fertilizing integrated system is high in degree of automation, can be conveniently moved in an indoor soft and wet ground, and can be used for enlarging the irrigating range, improving the working efficiency and lowering the labor intensity of users.

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.

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 flow sensor serves to measure an electrically conductive fluid flowing in a pipe. It comprises a flow tube designed to be inserted into the pipe for conducting the fluid, the flow tube being electrically nonconductive at least on a fluid-contacting inner side, an electrode arrangement consisting of at least two measuring electrodes disposed on the flow tube for picking up a voltage induced in the fluid, and a magnetic field system likewise disposed on the flow tube. The magnetic field system comprises at least two saddle-shaped field coils for producing a magnetic field cutting the fluid during operation of the flow sensor, a respective ferromagnetic pole piece for each of the two field coils, as well as at least one ferromagnetic return path extending around the flow tube upstream of the two field coils and at least one ferromagnetic return path extending around the flow tube downstream of the two field coils for directing the magnetic field around the flow tube. The pole pieces are magnetically coupled to the return paths by means of ferromagnetic coupling elements. Each of the, preferably identically shaped, coupling elements has at least one essentially trough-shaped cover segment which receives a first winding section of the respective associated field coil, lying essentially on a first periphery of the flow tube, or a second winding section of the associated field coil, lying essentially on a second periphery of the flow tube.

The invention relates to a high-precision soil thermophysical property tester for a ground source heat pump, and belongs to the technical field of energy-saving and air-conditioning. The tester consists of a filter, an electric heater, a water supplementing tank, a one way valve, a tee joint, a water circulating pump, a second ball valve and an electromagnetic flow meter which form a test pipeline. A data computation module computes soil thermophysical property parameters by adopting programs of an infinite line heat source model and a finite line heat source correcting model according to five parameters of average temperature of circulating water, initial temperature of soil, heat exchange amount of unit pipe length of a heat exchanger for an embedded pipe, flow rate of the circulating water and the depth of the embedded pipe. The tester can not only be applied to actual measurement of engineering, but also applied to researching the underground soil thermophysical property parameters when the ground source heat pump works for a long time. The tested computation result is in more accordance with the practical situation; and the tester has the advantages of compact structure, high test precision, wide test power range, high visibility degree, convenient operation and safe use.

The invention discloses an injection type erosion corrosion testing device and belongs to the field of metal material corrosion prevention. Polytetrafluoroethylene plastic serves as a pipeline loop material. The device comprises a constant-temperature liquid storage box, an erosion chamber, a stirring chamber, a circulating pump, a pipeline loop, a nozzle, a semi-cylindrical sample table and a clamp, wherein the circulating pump is connected in series with a frequency converter to change the operating frequency of a pump body so as to realize zero-order speed change; an electromagnetic flow meter is arranged on the pipeline loop at the rear section of the circulating pump and is used for monitoring flow in real time; a gear is arranged inside the stirring chamber; an external speed-regulating motor is installed for driving the gear to stir a fluid so as to ensure that solid particles in the fluid are uniformly suspended; a clamping device comprises the semi-cylindrical sample table and the clamp; an erosion angle of the fluid is changed by rotating the sample table. A reference electrode and an auxiliary electrode are arranged in the erosion chamber, the reference electrode, the auxiliary electrode and a sample clamped by the clamp form a three-electrode system which is externally connected with an electrochemical working station and a computer, and real-time dynamic electrochemical measurement at different fluid speeds, angles and temperatures can be realized by accurate control.

The invention provides a fast calculation method of target electromagnetic scattering characteristics. The fast calculation method comprises the following steps: carrying out overall subdivision on an established geometric profile non-conformal grid model, selecting induced electromagnetic flow on an analog target surface of an electromagnetic basis function on a target subdivision grid, constructing impedance matrix elements by using a discontinuous Galerkin integral equation and boundary conditions, grouping the targets by using a tree block grouping strategy, accelerating a matrix-vector multiplication speed by using an adaptive cross approximation algorithm, iteratively calculating an electromagnetic flow inductance coefficient on the target surface under an irradiation source by using a generalized minimal residual method, calculating a radiation field of induced electromagnetic flow on the target surface, and obtaining secondary scattering field characteristic data. The fast calculation method provided by the invention has the advantages of strong adaptability and high calculation precision, greatly expands the calculation efficiency and the calculation ability of the integral equation, reduces the subdivision difficulty, and is easy for engineering.

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.

The invention discloses a simulation method for electromagnetic scattering characteristic of a plurality of non-coaxial rotating symmetric bodies. The simulation method comprises the following steps of: building a model of each rotating symmetric body and a corresponding equivalent sphere; respectively building first and second local rectangular coordinate systems on each rotating symmetric body; determining the excitation vectors by using plane wave as an excitation source; respectively building scattering matrixes in the first local coordinate system of each rotating symmetric body; building a third local rectangular coordinate system for every two equivalent spheres and determining the transmission matrix between the two equivalent spheres; building rotating matrixes among the first, second and third local rectangular coordinate systems; building an equation set and obtaining equivalent electromagnetic flow on each equivalent sphere by using an iteration method; and determining the scattering field of a remote area, thus obtaining the radar scattering section area. The simulation method disclosed by the invention provides a quick and efficient solution for electromagnetic scattering simulation of a plurality of rotating symmetric bodies, saves spatial resources, and can accurately and quickly simulate the electromagnetic scattering characteristic of the plurality of non-coaxial rotating symmetric bodies.

The invention relates to an means and method for monitoring the flow of a fluid. The invention relates to an electromagnetic flow meter and method for measuring the axial velocity profile of a conducting fluid. The conducting fluid may be a conducting single phase fluid or a conducting continuous phase of a multiphase fluid. The conducting fluid may have a uniform flow profile or a non-uniform flow profile. The electromagnetic flow meter and method measure the axial velocity profile of a conducting fluid by dividing the flow cross section into multiple pixels and determining the axial velocity of the conducting fluid in each pixel. Having. derived the axial velocity profile, the electromagnetic flow meter and method may further derive the volumetric flow rate of the conducting fluid. The electromagnetic flow meter and method may be suitable for measuring the axial velocity profile and optionally the volumetric flow rates of each phase of a multiphase fluid.

The invention discloses a model test device and method for simulating water burst grouting plugging of a karst pipeline. The device comprises four parts, namely a pipeline system, a pressure-stabilized water supply system, a grouting system and a data acquisition and processing system, wherein the pipeline system is composed of a transparent organic glass pipe and a metal bracket; the inlet of the organic glass pipe is connected with the pressure-stabilized water supply device through a high-pressure hose; a flow valve is arranged on the high-pressure hose; a slurry-water collection tank is arranged at the outlet of the organic glass pipe; a grouting hole is formed in the middle of the organic glass pipe; the grouting hole is connected with the grouting system through a high-pressure slurry delivery pipe; the data acquisition and processing system comprises a pressure sensor I, an electromagnetic flow sensor II and a pressure sensor III; the pressure sensor I is mounted on the organic glass pipe and is used for monitoring the water flow pressure; the electromagnetic flow sensor II is used for monitoring the flow of moving water; the pressure sensor III is mounted on the high-pressure slurry delivery pipe and is used for monitoring the slurry pressure; the pressure sensors I and II and the electromagnetic flow sensor are connected with a paperless recorder; the paperless recorder is capable of recording the change conditions of pressure and flow in the pipeline in real time; and in the grouting plugging process, image acquisition in the grouting process is performed through a high-definition camera.

The invention provides an experiment apparatus for researching thermal hydraulic characteristics in a heating rod bundle channel under a dynamic condition. An experimental loop system comprises a circulating water pump, a first control ball valve, a preheater, a filter, a first sub-header, an electromagnetic flow meter, a rod bundle channel experiment body, a second sub-header, a condenser and an exhaust valve, the end part of the exhaust valve is connected with the circulating water pump, and the circulating water pump is connected with the first control ball valve and then is provided with a second control ball valve in a parallel manner; a circulating cooling water system comprises a water storage tank, and a cooling water pump and a cooling tower which are respectively connected with the water storage tank, and the end part of the cooling water pump and the end part of the cooling tower are respectively connected with the condenser through pipelines; and a control and data acquisition system comprises an angle sensor, a differential pressure gauge and pressure gauge and thermocouple, a signal acquirer and a computer. The apparatus has the advantages of simplicity, easiness in operation, obtaining of stable experimental data, and facilitation of the scientific research of the flow and heat transfer in the rod bundle channel and the engineering design of a passive safety system.

The invention aims at providing a device for testing the jet flow drag reduction effect of a two-dimensional plane. The device comprises a water tank, a water pump and a test section, wherein the test section comprises a two-dimensional channel, a two-dimensional channel inlet is arranged at one end of the two-dimensional channel, a two-dimensional channel outlet is arranged at the other end of the two-dimensional channel, the two-dimensional channel inlet is in a gradually reducing shape, the two-dimensional channel outlet is in a gradually expanding shape, a grid type rectifying section is arranged between the two-dimensional channel inlet and the two-dimensional channel, the water pump is communicated with the water tank, the water pump is communicated with the two-dimensional channel inlet through an inlet pipeline, the two-dimensional channel outlet is communicated with the water tank through an outlet pipeline, a speed regulator valve, an electromagnetic flow meter and a pressure meter are arranged on the inlet pipeline, the inlet pipeline is also communicated with a backflow pipeline on which an overflow valve is arranged, and the backflow pipeline is communicated with the water tank. The device has the advantages of low cost, compact structure, small size, convenience in daily maintenance and low noise. The device can be used for testing the drag reduction effect of jet flow surfaces and non-smooth surfaces and can also be used for conventional fluid dynamic tests.

The invention discloses a method for measuring flow of conductive fluid in a non-full pipe by using an electromagnetic flow meter. The adopted flow meter is provided with at least three pairs of measuring electrodes, a grounding electrode, a coil structure for generating a magnetic field and a pressure sensor; a plurality of pairs of electrodes on the inner wall of the measured pipe ensure that each pair of electrodes is contacted with the fluid under different fluid levels H; and the measuring electrode pair is reasonably selected according to the different fluid levels so as to ensure the measurement accuracy. The measurement method is characterized in that: different pairs of electrodes are selected for measuring the flow rate under the different fluid levels, a fluid level signal H is obtained by using a pressure signal P of the pressure sensor so as to overcome measurement errors of the conductive fluids of different categories due to different conductivities and dielectric constants, the equivalent sectional area S of the fluid in the non-full pipe is calculated through the fluid level signal, the signal E of an induced electromotive force measured by the flow sensor is converted into a flow rate signal V, and the corresponding flow Q of the fluid in the non-full pipe can be obtained by integrating the equivalent sectional area S and the flow rate signal.

The invention provides a full-automatic flotation reagent quantitative adding system for coal slime. The reagent quantitative adding system comprises a liquid level detector, a pressure release valve, a metering pump, a safety circuit, an electromagnetic flow meter, a dustproof negative-pressure discharge hopper and a programmable controller. The safety circuit is controlled by an electromagnetic valve, and the programmable controller can process and control feedback signals. The full-automatic flotation reagent quantitative adding system has the advantages that reagent quantities can be accurately and stably controlled, reagent deficiency can be prevented, and partition and return effects can be realized for downstream unpredictable sudden accidents; the metering pump capable of accurately adjusting the output quantities and the electromagnetic flow meter capable of accurately measuring flow are introduced into the flotation reagent quantitative adding system, so that the problem of failure of an existing metering pump due to negative pressure of pipelines can be effectively solved, automatic reagent adding, liquid level detection and warning effects can be realized for a reagent bucket, and the full-automatic flotation reagent quantitative adding system is provided with the safety circuit; components of the integral system can stably run and can be automatically controlled, so that the labor intensity of operators can be reduced to the greatest extent.

The invention discloses a sterile filling valve applied to a sterile cold filling production line of beverage products. The filling valve comprises a material flowing cavity channel, and a valve opening and closing device is combined with a valve body into a whole, and the valve opening and closing device and the valve body are completely separated into two parts by an air and liquid separation film. The design guarantees the sanitation requirement of the sterile filling, and reduces the interference on the material flowing by the complicated design, so the material is favorable to flow, and the cavity channel is convenient to clean in all directions. The filling valve is integrally arranged on a mounting hole of a rotary table of a filling machine, and pairwise pressed by press plates, sothe valve can be conveniently mounted and detached. A pipeline of the filling valve is provided with an electromagnetic flow meter and a metal film valve for accurately controlling the filling accuracy. The valve adopts the filling method of not contacting bottle openings, so the pollution can not be caused even if the polluted bottles exist. Various functions of accurate filling of various levels, filling under the condition of bottle existence, no filling under the condition of no bottle, filling stop under the condition of bottle fulfillment, and the like can be realized by a filling control unit.

The invention relates to a power generation device for a highway deceleration strip. The power generation device comprises the deceleration strip, a first straight rod connected with the deceleration strip, a second straight rod hinged to the first straight rod, a first shaft, a second shaft, a third shaft, a hydraulic cylinder, an energy accumulator, a pressure sensor, an electromagnetic flow control valve and a hydraulic oil tank; the second shaft is sequentially provided with a first ratchet wheel, a first gear, a second detent and a second ratchet wheel, and the first shaft is provided with a first detent which is internally meshed with the first ratchet wheel and a second gear which is externally meshed with the first gear; a clutch is arranged between the second shaft and the third shaft, and the third shaft is provided with a planar volute spring, a one-way gear and a rotation speed sensor; the one-way gear is meshed with a third gear which is connected with an electric generator; the pressure sensor and the rotation speed sensor are electrically connected with the clutch, and the rotation speed sensor is electrically connected with the electromagnetic flow control valve. According to the power generation device for the highway deceleration strip, energy of the deceleration strip is bidirectionally recovered by applying the one-way driving characteristic of the ratchet wheels, a hydraulic system is utilized to control the energy releasing time of the volute spring, and the purpose of saving the energy is achieved.