52results about How to "Improve flow measurement accuracy" patented technology

The present invention is generally related to a novel micromachining thermal mass flow sensor and, more particularly, to a device incorporated with high strength and robust characteristics, which therefore is capable of operating under harsh environments. The new disclosed sensor is made of essential material which can provide robust physical structure and superior thermal properties to support the flow measuring operation. The invented thermal mass flow sensor is featuring with the advantages of micro-fabricated devices in terms of compact size, low power consumption, high accuracy and repeatability, wide dynamic range and easiness for mass production, which could avoid the drawbacks of fragility and vulnerability.

A flow diverter for diverting an initial flow stream of pressurized fluid from a source of pressurized fluid. The flow diverter comprises a housing having an upstream end, an inlet opening in the upstream end, a downstream end generally opposed to the upstream end, a top plate extending between the upstream end and the downstream end, a bottom plate generally opposed to the top plate and extending between the upstream end and the downstream end, and a pair of generally opposed lateral sides extending between the upstream end, the downstream end, the top plate and the bottom plate. The upstream end is adapted to be attached to the source of pressurized fluid and the inlet opening is adapted to receive the initial flow stream of pressurized fluid from the source of pressurized fluid. The downstream end is adapted to divert the initial flow stream of pressurized fluid toward the pair of generally opposed lateral sides. The pair of generally opposed lateral sides are adapted to permit the initial flow stream of pressurized fluid to exit the housing in a pair of generally opposed diverted flow streams of pressurized fluid that are substantially perpendicular to the initial flow stream of pressurized fluid. The pair of generally opposed lateral sides are also adapted to permit the measurement of the initial flow stream of pressurized fluid.

An ultrasonic flow meter is disclosed, the ultrasonic flow meter including a flow tube with a flow channel for a fluid to be measured, and two ultrasound reflectors fixated inside the flow tube, a first ultrasound transducer, a second ultrasound transducer, and an electronic control arrangement for operating the ultrasonic flow meter. The ultrasound transducers and reflectors have relative positions and orientations forming an ultrasound path from the first ultrasound transducer to the at least two ultrasound reflectors, to the second ultrasound transducer, and vice versa. The ultrasonic flow meter measures absolute transit times of the ultrasound signal from the first ultrasound transducer to the second ultrasound transducer, and / or vice versa, and the ultrasound reflectors include at least 50% by weight of copper, and the ultrasound signal includes at least 8 pulses.

The invention discloses a broadband multiple correlation flow velocity measurement method. Echo signals are sampled by adopting a time-interleaved sampling technology so that a discrete sampling sequence is obtained; multiple correlation algorithm processing and cross spectrum autocorrelation algorithm processing are respectively performed on the discrete sampling sequence; the number of multiple correlation points is increased in the process of multiple correlation algorithm processing, and real-time performance of flow velocity measurement is guaranteed by adopting odd and even paths of parallel multiple correlation processing; and cross spectrum interpolation time delay estimation is performed on the time-interleaved sampled data by cross spectrum autocorrelation algorithm processing so that a time delay value is obtained, and the time delay value is adopted to roughly measure the flow velocity value to act as the judgment standard of a flow velocity size interval, assist multiple correlation algorithm flow velocity measurement and correct the range of flow velocity measurement. Advantages are that multiple correlation algorithm processing and cross spectrum autocorrelation algorithm processing are supplementary for each other, sampling rate of the signals is enhanced by adopting the time-interleaved sampling technology, and multiple correlation algorithm flow velocity measurement is assisted through combination of the roughly measured flow velocity value of the cross spectrum autocorrelation algorithm so that measurement precision is high and measurement range is wide.

The invention discloses an ultrasonic flow meter. A measurement module controls and enables two ultrasonic sensors with functions of transmitting and receiving ultrasonic wave to emit the ultrasonic wave passing through a fluid so as to acquire flow rate sensing information of the fluid; and the two ultrasonic sensors receive the ultrasonic wave which comprises the flow rate sensing information of the fluid and is transmitted by the opposite side, convert the ultrasonic wave into electric signals, and transmit the electric signals into the measurement module to be calculated so as to acquire flow information of the fluid. An inflow pipe is connected to a straight pipe at an angle of less than 90 degrees to the negative direction of a horizontal coordinate axis, and an outflow pipe is connected to the straight pipe at an angle of less than 90 degrees to the positive direction of the horizontal coordinate axis; and a measurement conduit is connected into a fluid conduit which needs to measure the flow, and the two ultrasonic sensors are positioned at two ends of the straight pipe respectively. In the ultrasonic flow meter, the measurement conduit is connected into the fluid conduit, and the ultrasonic sensors are positioned at two ends of the straight pipe of the measurement conduit, so the length of effective path of ultrasonic propagation is increased, the strength of effective signals is promoted, then the purpose of increasing the measurement precision is increased, and the ultrasonic flow meter is particularly suitable for measuring the fluid with small flow and low flow rate.

The invention discloses an open channel section water flow online measuring device and a measurement and control method. The device comprises a measuring supporting frame, a measuring rod assembly is fixedly installed on the measuring supporting frame, a side rod assembly communicates with a signal processing control host 11, the measuring rod assembly comprises a measuring rod 8 and a measuring rod driving mechanism, and a set of sensors are arranged on the side rod 8. The measuring rod driving mechanism comprises a measuring rod lifting motor 10, an output shaft of the measuring rod lifting motor 10 is fixedly connected with a coded disc 4 and a shaft angle encoder 5, and the coded disc 4 is fixedly connected with the measuring rod 8. The technical problem to be solved by the invention is to provide the open channel section water flow online measurement device and the measurement and control method so as to solve the problems that the existing open channel flow measurement equipment realizes multi-vertical-line multi-measurement-point water flow real-time online measurement according to relevant national standards, and the measurement is inaccurate under the conditions of turbid water body, silted channel, sundries in the water body and the like. The problem of real-time online flow measurement of the open channel can be effectively solved.

The invention relates to a decomposition section-based flow velocity measuring method. The method includes the following steps that: the flow of a section is measured, so that flow measurement data can be obtained; a plurality of section decomposition lines are set on the flow measurement section, so that the flow measurement section can be divided into a plurality of decomposition sections; the area weight coefficients of each of the decomposition sections are calculated; the flow velocity of each decomposition section is determined; the correlation coefficients of the flow velocity of each decomposition section and the flow velocities of the decomposition sections are determined; the correlation coefficients of the flow velocity of each decomposition section and the average flow velocityof the section are determined; the positions of the section decomposition lines are adjusted, the above steps are repeatedly executed for a plurality of times, so that the area weight coefficients ofeach of the decomposition sections and the correlation coefficients of the flow velocity of each decomposition section and the average flow velocity of the section during the plurality of times of division are obtained; and the flow of representative decomposition sections in the decomposition sections during the plurality of times of division is measured, so that full-section flow can be obtained. According to the decomposition section-based flow velocity measuring method of the invention, the flow of the section is automatically tested through using a fixed-point acoustic Doppler flowmeter,and therefore, the standardability and accuracy of the flow calculation of the section are improved.

The invention discloses a device and method for measuring a water yield-electric quantity conversion coefficient of an irrigation pumping station in a plain river network. The device comprises a watertank which receives water pumped from a water pool by a water pump; a flow measuring tube is arranged after the water tank; a flowmeter is arranged at the middle half part of the flow measuring tube;and an electric valve is arranged at the tail of the flow measuring tube. The distance between the flowmeter and a water inlet tank is larger than the diameter of the flow measuring tube by at leastten times and the distance between the flowmeter and the electric valve is larger than the diameter of the flow measuring tube by at least five times. A flat water grid baffle for wave absorbing is arranged in the water tank. The device is used conveniently; no agricultural land is occupied; and the flow measuring accuracy is high.

The invention relates to a hydrographic measurement instrument, in particular to an instrument for measuring the declination of a measurement wire rope of a hydrologic bridge flow measurement vehicle to deviate the vertical direction. A hydrologic bridge flow measurement vehicle sounding declination reading disk arranged on the support of the runner of a lifting lead fish steel rope consists of a metal disk marked with scales, a reading pointer and a pointer push rod; wherein, the metal disk is fixed on the support of the runner; the reading pointer and the pointer push rod, coaxially arranged and fixed together, are coaxial with the runner and can synchronously move around the axis line of a runner shaft; the extremity of the L-shaped pointer push rod is provided with a lantern ring; the steel rope of the lifting lead fish runs through the lantern ring. The instrument is characterized by simple construction, little investment, strong practicality and convenient observation and installation and has the advantages that the instrument can be directly arranged on the existing equipment, directly observe the sounding inclination, correct the sounding and improve the flow measurement. When the sounding inclination is oversized, the instrument prompts to replace the lead fish.

The invention discloses an electromagnetic water meter magnetic field anomaly detection and error compensation method and system. The method comprises the following steps of: excitation current stabilization time is detected; the error of the flow measurement value of an electromagnetic water meter caused by an abnormal magnetic field according to an algorithm for performing deviation compensation on the flow measurement value of the electromagnetic water meter is corrected according to the deviation of the detected excitation current stabilization time; and an alarm icon is displayed on a display screen of the electromagnetic water meter, and alarm information is sent to a user system platform through a data remote transmission module of the electromagnetic water meter. Strong magnetic field interference outside an electromagnetic water meter sensor can be regularly detected, and errors of flow measurement values of the electromagnetic water meter caused by magnetic field abnormity can be corrected, so that the accuracy of the flow measurement values of the electromagnetic water meter is improved when the electromagnetic water meter is influenced by an external strong magnetic field; and meanwhile, a water user can be prevented from cheating by using the external strong magnetic field.

A catheter for retrograde orientation in a blood flow is used to determine the blood flow rate by thermodilution measurements. The determination of the blood flow rate accommodates injectate induced thermal influences on a dilution thermal sensor, wherein the thermal influences can occur prior to introduction of the injectate into the blood flow.

Application of an automatic flow measurement mathematical model for a farmland irrigated area open channel. The application refers to application of realizing automatic flow measurement for the farmland irrigated area open channel based on the automatic flow measurement mathematical model for the farmland irrigated area open channel; the mathematical model is composed of a flow measurement device and a control system; and according to the application, a flow measurement device model for the irrigated area open channel is fixed above a measured channel, a swing rod is placed into the open channel, water flow impacts the swing rod to enable the swing rod to deflect by a certain angle, the deflection angle of the swing rod is acquired through an impulse signal of an photoelectric encoder, and the deflection angle of the swing rod is compared with a previously established mathematical model so as to obtain channel flow of the farmland irrigated area open channel. According to the application, the mathematical model is established, and the waterflow is utilized to impact the swing rod to enable the swing rod to deflect by a certain angle so as to detect the flow of the farmland irrigated area open channel; through singlechip technical processing, automatic flow measurement for the farmland irrigated area open channel is realized and the flow measurement precision is improved; furthermore, the price is low, and the application is convenient for popularization and application of an irrigated area.

An intelligent channel flow meter with servo-tracing system and its measuring method. The velometer and displacement detector are fixed in the front of push bar of the servo- tracing executing structure, which comprises actuating device connecting push bar controlled by servo-tracing system. Convertor according to water-level detector measures the actual water level. And it can measure the given point velocity through servo-tracing execution structure and can feed the measuring signals back to the convertor which calculates flow capacity of the channel. The invention can solve the problem that channel flow meter cannot woke stably rising from filing-up, winding-up of floater, which is applied to the flow measuring of rectangle and trapezoidal channel of reservoir, river irrigation engineering, city water supply, farming irrigation.

A catheter for retrograde orientation in a blood flow is used to determine the blood flow rate by thermodilution measurements. The determination of the blood flow rate accommodates injectate induced thermal influences on a dilution thermal sensor, wherein the thermal influences can occur prior to introduction of the injectate into the blood flow.

The invention belongs to the technical field of petroleum engineering, and particularly relates to a horizontal well oil-water two-phase flow measuring method based on a thermal method. The method comprises the following steps: 1, installing a pair of capacitance sensors at the upstream of a horizontal oil-water pipeline to measure the water content of two-phase flow, and judging that fluid reaches a stable state through the water content; 2, after the flow pattern reaches a stable state, controlling a pulse type internal heat source in the horizontal pipeline to heat the oil-water two-phase flow fluid to generate a thermal pulse with short duration and high peak value; 3, fixing a temperature detector at an oil-water two-phase flow inlet, and measuring the initial temperature of the fluid, arranging two temperature detector arrays in a downstream pipeline of a heat source; collecting a temperature signal of the fluid in the pipeline; and 4, establishing an average flow velocity calculation model of the horizontal oil-water two-phase flow, and calculating the flow of the horizontal oil-water two-phase flow. The problems of influence on oil-water two-phase flow measurement and inaccurate average flow measurement caused by the problems of oil well sand production and the like are solved, and the flow of the oil-water two-phase flow of the horizontal well is measured more accurately.

The invention provides an optical fiber differential pressure sensing system with high static pressure and low differential pressure, which comprises a packaging shell and an optical fiber differential pressure sensing system located in the packaging shell, wherein the optical fiber differential pressure sensing system comprises two structures, differential pressure is converted into physical deformation through an optical fiber sensor, and the physical deformation is measured through the optical fiber sensor, so that the pressure difference is measured, and the measurement precision of the optical fiber differential pressure sensor can be effectively improved.

The invention belongs to the field of gas turbine engines, and discloses a test device and method for measuring flow coefficients of flame tube air inlets. The test device comprises a measuring section assembly, an exhaust assembly, an air inlet plate, a support frame and filler blocks. The measuring section assembly simulates flowing of air flow in two channels of a combustion chamber. The exhaust assembly simulates an inner cavity space of a flame tube, and an original method of obtaining air flow of the air inlets by using two flowmeters on secondary flow channels is replaced by an air exhaust measuring method to carry out measurement at an outlet of the exhaust assembly so as to increase air inlet flow measuring precision. The exhaust assembly is processed by using polymethyl methacrylate materials to carry out visualized analysis of air inlet exit flow field, test precision of flow coefficient data is improved, and complexity of test pieces is reduced. Test data can be conveniently used for calibration of calculation models of one-dimensional flow analysis software and three-dimensional commercial CFD software, and verification of annular combustion chamber flow distribution tests.

The invention discloses a tentacle-type sensing flow measurement instrument based on an artificial intelligence technology and a flow measurement method of the instrument and relates to the technicalfield of liquid flow measurement. The tentacle-type sensing flow measurement instrument comprises a central pivot structure, a connection part and multiple tentacles, the central pivot structure is connected with the connection part, and one end of each tentacle is connected with the connection part; the other end of each tentacle is a free end of flexible extending in the four directions, the central pivot structure comprises a power module, a receiving storage module, an analysis transmission module and a control display module, and the power module is connected with the receiving storage module, the analysis transmission module and the control display module separately; each tentacle comprises a sealing layer, a structure layer and a framework layer from outside to inside, and multiplesensors are installed on each tentacle. The problems can be solved that an existing flow measurement instrument is incomprehensive in application range, and a flow measurement method is traditional. The tentacle-type sensing flow measurement instrument has the advantages of being light, movable, capable of achieving quick measurement and suitable for various scenes.

The invention discloses a frontal pool water level control method for an energy characteristic test of a channel diversion-type hydropower station water turbine. The method includes the following steps that (1), an arrangement of at least four acoustic paths is adopted; (2), all transducer cables are led out of a flowing channel, connected into a front unit and connected with a notebook computer, and adjusting is performed under the condition that water exits in the flowing channel; (3), a recording interval is set in flow measuring software of the notebook computer, the starting time and ending time of each working condition are recorded, and after each working condition is tested, historical data can be exported and analyzed according to the starting time and ending time of the test. Novel channel transducers variable in acoustic path angle are adopted, in this way, installing is convenient, flow measuring precision is improved, and the test precision of a system is improved.

The invention discloses a high-precision anti-blocking flowmeter. A connecting piece (10) is arranged above a base (14). A lower assembly body (7) is arranged above the connecting piece (10). Two expansion cavities (8) are formed in the lower assembly body (7). A negative end probe (12) and a positive end probe (13) are arranged on the connecting piece (10). The top end of the negative end probe (12) and the top end of the positive end probe (13) are respectively communicated with the expansion cavities (8). The lower section of the negative end probe (12) and the lower section of the positive end probe (13) are inserted into the base (14). An upper assembly body (2) is arranged on the lower assembly body (7). A pressure taking short tube (1) is arranged on the upper assembly body (2). An installation hole (14) of the upper assembly body (2) is communicated with the expansion cavities (8) of the lower assembly body (7). Insulation membranes (5) are arranged between the installation hole (4) and the expansion cavities (8). Thus, the overall body of the high-precision anti-blocking flowmeter is formed. The high-precision anti-blocking flowmeter is high in measuring precision, strong in industrial control capacity in severe environments, and low in maintenance cost.

The invention discloses an integrated telemetering irrigation region flowmeter which comprises an upstream honeycomb duct, a water measuring pipe, a downstream honeycomb duct, a flow sensor, an acquisition module, a communication module and a storage battery, wherein the tail end of the upstream honeycomb duct is connected with one end of the water measuring pipe, the head portion of the downstream honeycomb duct is connected with the other end of the water measuring pipe, the flow sensor is connected with the acquisition module, the acquisition module is connected with the communication module, the storage battery supplies power to electrical elements, and the flow sensor comprises a base plate, a rotor, a tongue tube, magnetic steel and a plurality of semiangle rotary cups. The base plate is fixed on the top of the water measuring pipe, and the semiangle rotary cups are arranged under the base plate and fixed on the rotor. A diversion member is arranged under the base plate, and the diversion member and the semiangle rotary cups are placed in the water measuring pipe. The magnetic steel is fixed on the rotor and excites the tongue tube to generate on-off signals, and the tongue tube is connected with the acquisition module. Plate-shaped splicing structures are employed to form gradual changing type honeycomb ducts. A special flow sensor is placed in the water measuring pipe. The measurement is accurate, and on-site installation is simple and fast.

The invention discloses an integrated intelligent algorithm and an internet-of-things intelligent water meter with multiple communication modes. The water meter comprises an ultrasonic flow measurement device, an intelligent control device and a communication module. An original ultrasonic flow measuring idea is broken, an ultrasonic measuring circuit is redesigned, a support for rectification anda temperature sensor are additionally arranged, and the flow measuring precision is improved. By means of the modern internet-of-things communication idea, the problem that a traditional mechanical water meter does not have a remote communication function or the communication mode is a monotonous wired mode is solved, and an internet-of-things intelligent instrument can be suitable for more complex mounting environments. Three parts of batteries in the water meter supply electricity independently and run synergistically, and the problems that due to the fact that power supply voltage is too low, flow measuring and meter reading storage, valve control and remote communication cannot be achieved are effectively avoided.

The invention discloses a natural gas purification system and a natural gas purification method for a natural gas flow primary standard device. The system comprises a desulfurization tank, a buffer tank, a dehydration device and a filter, wherein the desulfurization tank, the buffer tank, the dehydration device and the filter are sequentially communicated through a pipeline, the desulfurization tank is communicated with the gas source of a natural gas flow primary standard device and is used for removing sulfur in natural gas, the dehydration device is used for enabling natural gas to pass through from top to bottom so as to adsorb the moisture in the natural gas, the filter is used for removing the solid particles in the natural gas and conveying one part of the natural gas into the standard flow meter of the natural gas flow primary standard device, the natural gas purification system comprises a heater arranged between the filter and the dehydration device, and a condenser communicated with the dehydration device, the heater is used for heating the other part of the natural gas to a first preset temperature and enabling the natural gas to pass through the dehydration device frombottom to top so as to desorb the moisture adsorbed by the dehydration device, and the condenser is used for cooling the moisture generated during the desorbing of the dehydration device.