35results about "Indirect mass flowmeters" patented technology

A method for monitoring a gas system comprises determining a fuel mass flow rate requirement of a consumer system (e.g., fuel cell system comprising a fuel cell assembly), closing a first valve device in order to interrupt a gas feed from a tank into a high-pressure pipe system connecting the tank to the consumer system, capturing a pressure curve in the high-pressure pipe system while the first valve device is closed, in particular by means of a pressure sensor, determining a theoretical actual mass flow rate in the high-pressure pipe system on the basis of the captured pressure curve, comparing the theoretical actual mass flow rate in the high-pressure pipe system with the determined fuel mass flow rate requirement of the consumer system, and generating an error signal by means of a control device if the theoretical actual mass flow rate deviates from the fuel mass flow rate requirement by more than a threshold value.

A method includes insonifying, using at least one transducer, a vessel using first ultrasound energy of a first frequency, receiving, using the at least one transducer, a first analogue signal obtained using the first ultrasound energy, determining, using processing circuitry, a first material property of the vessel based on a first frequency response signature of the first analogue signal, insonifying, using the at least one transducer, a fluid in the vessel using second ultrasound energy of a second frequency lower than the first frequency, the second ultrasound energy creating cavitation of bubbles in the fluid to be measured, receiving a second analogue signal obtained using the second ultrasound energy and energy created by the cavitation of the bubbles in the fluid, and identifying a second material property of the fluid based on the first material property and a second frequency response signature of the second analogue signal.

The embodiment of the application discloses a kind of flow determination method, device and computer equipment, belong to measurement technical field.Method includes: the state parameter of fluid in pipeline is acquired;At least one of the state parameter of fluid and the structural parameter of pipeline is operated and handled, and the multiple flow characteristic parameters of fluid are obtained;Through flow determination model, based on the state parameter of fluid, multiple flow characteristic parameters and the structural parameter of pipeline, the second flow of fluid is determined, and the second flow is the average flow of fluid in historical time period before acquisition time point, and the second flow is used to determine the cumulative flow of fluid in historical time period.The above technical scheme can be more accurately determined according to the structural parameter of pipeline and the state parameter of fluid in pipeline, the average flow of fluid in historical time period, and then the cumulative flow of fluid in historical time period can be measured according to average flow, improve the accuracy of flow determination.

To estimate the liquid amount or the dryness degree of a fluid as an index of the quality of steam by an operation according to the state of the fluid.SOLUTION: There is provided a device which includes: a measured value acquisition unit for acquiring a plurality of measured values regarding a fluid; a state determination estimation unit for estimating the state of the fluid on the basis of at least one of the plurality of acquired measured values; a fluid quality estimation unit for estimating at least one of the liquid amount and the dryness degree regarding the fluid from the at least one of the plurality of acquired measured values according to the estimated state of the fluid; and an output unit for outputting at least one of the estimated fluid amount and the estimated dryness degree. The device further includes a selection unit for selecting one of a plurality of operations which corresponds to the estimated state of the fluid. The fluid quality estimation unit estimates at least one of the liquid amount and the dryness degree regarding the fluid from at least one of the plurality of measured values acquired by the selected operation.SELECTED DRAWING: Figure 1

An example flow meter insert includes a housing; a shaft mounted partially within the housing such that the shaft protrudes outside the housing; a turbine that is rotatably coupled to the shaft, wherein the turbine comprises an impeller mounted to the shaft external to the housing; a plurality of magnets, wherein the turbine is configured to rotate as fluid flows across the impeller, thereby causing the plurality of magnets to rotate therewith; and a sensor mounted adjacent the plurality of magnets to detect variation in a magnetic field as the plurality of magnets rotate along with the impeller, wherein, based on detecting the variation, the sensor is configured to provide information indicative of a count of revolutions and direction of rotation of the impeller to facilitate determining fluid flow rate and direction of fluid flow.

A void fraction sensor according to the present disclosure includes an insulating pipe having a plurality of through holes through which a liquid flows, and a plurality of electrodes located inside or on the outer surface of the insulating pipe and facing each other across the plurality of through holes. The plurality of through holes have an elongated shape having a first direction and a second direction shorter than the first direction in a cross section perpendicular to the flow direction of the liquid. The plurality of electrodes face each other across the plurality of through holes in the second direction.

Differential density system and method. A differential pressure transmitter measures a pressure difference between first and second pressure sensing locations. A reference vessel in fluid communication with the first pressure sensing location contains a reference fluid and a sample vessel in fluid communication with the second pressure sensing location contains a sample fluid. The reference fluid is in a first column above the first pressure sensing location and the sample fluid is in a second column above the second pressure sensing location. The second column is of substantially equal height as the first column. A value of total dissolved solids (TDS) in the sample fluid is determined based on the pressure difference.

The present invention addresses to a real-time flow assurance occurrence monitoring system with the aim of reducing oil production losses caused by occurrences in the flow assurance area, which uses a web tool to integrate results of simulations of multiphase flow and thermodynamic simulators with production data and specific correlations, developed to monitor the formation of deposits or blockages in subsea lines. This tool has the specific objective of monitoring the formation of hydrates, paraffins and emulsions in real time and other occurrences that may cause a production shutdown. Based on this information, it issues an alert of the occurrence in the control rooms of the operational units, supporting decision-making on operational procedures that must be carried out to avoid the loss of oil production. It further records the operations carried out to mitigate occurrences. All data is structured in tables and graphs and can be exported to other systems.

This invention discloses a flowback fluid miscible metering device and method, relating to the field of drilling engineering fluid metering technology. The device includes a metering body, a waist-shaped Venturi throttle, photoelectric measuring elements, and pressure tapping elements. Two photoelectric measuring elements are respectively installed on both sides of the waist-shaped throat of the waist-shaped Venturi throttle, and two pressure tapping elements are used to collect the pressure at the inlet and the waist-shaped throat of the waist-shaped Venturi throttle, respectively. The pressure tapping elements include a pressure tapping port, a capillary assembly, a pressure sensor, a filter screen, and a pressure tapping tube. This invention uses a waist-shaped Venturi throttle, and the waist-shaped throat has a flow-oriented curved surface structure with a contraction-smooth transition-expansion along the fluid flow direction. The ratio of the cross-sectional area of ​​the waist-shaped throat to the cross-sectional area of ​​the inlet is 0.5. The inlet contraction section and the waist-shaped throat, as well as the waist-shaped throat and the outlet expansion section, all adopt a smooth arc transition without right angles or sharp corners. Compared with the abrupt changes in the cross-section of the traditional cylindrical throat, this reduces flow separation and vortices, lowers pressure loss, and is suitable for low-pressure conditions.

The present specification relates to the technical field of two-phase flow measurement, and particularly relates to a gas-liquid two-phase flow measurement method and device, computer equipment and a storage medium. The method comprises obtaining a measured volume flow, a measured mass flow and a measured density corresponding to a gas-liquid two-phase flow to be measured by a measurement device; collecting and calculating a first accurate density corresponding to a target liquid, and calculating a second accurate density corresponding to a target gas based on a gas pressure, a gas temperature and the target gas; substituting the measured volume flow, the measured mass flow, the measured density, the first accurate density and the second accurate density into a fitting formula to obtain fitting data; and processing the first accurate density, the second accurate density, the measured volume flow, the fitting data and the measured mass flow by using a mass separation formula to obtain a target gas mass flow and a target liquid mass flow corresponding to the target gas and the target liquid respectively, so that the mass flow of each phase can be determined conveniently and accurately.

A mechanism for determining a density of crop stored by a crop bin (390). Volume information and mass information of the crop is generated and processed to determine or derive the density of crop.

A sensor module (200) includes a sensor module body (100). A sensing element (101, 704) within the sensor module body (100) senses a characteristic of an environment. A breathing element (102) within the sensor module body (100) allows the sensing element (101, 704) to access the environment. Electronics (103, 702) within the senor module body (100) are coupled to the sensing element (101, 704). The sensor module body (100) forms a wall of a flame path (301).

The application discloses a pressure self-adaption method and system for a thermal mass flow controller and relates to the field of gas measurement and control. The method comprises the following steps: under the condition of no pressure sensor, a pressure change signal is captured by a flow measurement signal, when a preset determination condition is met, a transient pulse in the flow signal is determined as a pressure step signal, and a transient characteristic is extracted; model identification is performed based on the transient characteristic to determine the pressure change type, the pressure range and whether the control parameter needs to be adjusted, and precision compensation and control parameter compensation are performed accordingly; and the identification result is stored in a database, and when the same or similar pulse is detected subsequently, the corresponding compensation parameter is called. The application can realize pressure compensation under different pressure intervals without increasing a pressure sensor, reduces the hardware cost of the system, and improves the flow control precision and dynamic response stability.

A fluid monitoring module includes an enclosure, a fluid sensing device assembled with the enclosure, and a controller disposed within the enclosure. The fluid sensing device includes a body member defining a fluid port external to the enclosure and a male threaded sensor port mounted to the enclosure and extending laterally into the enclosure, a female threaded nut assembled with the sensor port, a fluid sensor seated against a counterbore portion of the sensor port, and a retaining collar having a neck portion extending into the sensor port in engagement with the fluid sensor and a head portion captured between the female threaded nut and an end face of the sensor port. The controller is in circuit communication with the fluid sensor for receiving at least one of pressure indicating signals and temperature indicating signals from the fluid sensor, and for measuring fluid data based on the received signals.

The application discloses a kind of quality flow meter measurement methods based on anti-vibration interference, comprising the following steps: S1, construct vibration coupling measurement timing data;S2, vibration energy parameter is projected to measurement sensitive subspace, obtain effective vibration energy parameter;S3, form history input window and prediction window;S4, the structured measurement timing input improves Chronos model, introduces error inversion mechanism and mechanism constraint mechanism, outputs mass flow measurement error component;S5, directional compensation is executed, and the mass flow measurement result after anti-vibration correction is obtained;S6, calculate double-scale JS divergence, and generate the mass flow measurement result after correction based on improved Dual-CONET algorithm;S7, the mass flow measurement result after anti-vibration interference suppression is output as final measurement value.The application realizes the accurate suppression and dynamic correction of mass flow measurement error under complex vibration condition.

This utility model belongs to the field of flow meter technology, specifically a pipeline-type thermal gas flow meter, installed on an installation pipeline. It includes: a measuring mechanism installed on the installation pipeline, a protective gasket mechanism disposed between the installation pipeline and the measuring mechanism, and a shock-absorbing mechanism disposed outside the protective gasket mechanism. The protective gasket mechanism includes a stainless steel support layer supporting the installation pipeline, a buffer layer attached to the stainless steel support layer, a sealing layer covering the buffer layer, and a heat dissipation layer connected to the outside of the sealing layer. Compared with traditional gaskets, this protective gasket mechanism has strong support, high corrosion resistance, good sealing effect, and a certain degree of elastic buffering effect. It can also accelerate the dissipation of heat generated during the operation of the measuring mechanism, resulting in a longer overall service life and effectively ensuring the safety of the measuring mechanism.

This invention relates to a bubble rate sensor for measuring the bubble rate of a cryogenic liquid. The bubble rate sensor comprises: a piping having a conduit for the flow of the cryogenic liquid; and electrodes disposed on the outer peripheral surface of the piping for measuring the electrostatic capacitance of the cryogenic liquid flowing within the conduit. The piping is composed of a divisible even number of ceramic components, and the electrodes are respectively disposed on at least two of the even number of ceramic components that are opposite each other.

The invention relates to a method (300, 400) for determining a gas phase mass fraction or mass flow rate, of a multi-phase medium in a measuring tube which comprises a break-away edge exposed to an incident flow and three pressure tap points influenced differently by the break-away edge, said method comprising the steps of: determining a first pressure drop (310; 410) between a first and a second of the pressure tap points which are impinged by the flowing medium; determining a second pressure drop (310; 410) between two pressure tap points which are each impinged by the flowing medium, one of the pressure tap points for determining the second pressure drop being a third of the at least three pressure tap points; and determining the mass fraction (330) or the mass flow rate (460) of the gas phase by means of the pressure drops, the first pressure tap point being arranged upstream of the break-away edge and both the second pressure tap point and the third pressure tap point downstream thereof, one normal vector being substantially axis-parallel to the second pressure tap point and one normal vector being perpendicular to the third pressure tap point, the second and the third pressure tap point being positioned approximately equally in the measuring tube longitudinal direction, the second pressure tap point being positioned at or close to a pressure minimum.

The application provides a high-frequency response mass flow measurement method based on forced convection heat exchange, comprising the following steps: S1, calibrating the resistance temperature coefficients of an upper layer measurement heating unit and a lower layer active heat insulation unit with a reference resistance, and calculating an upper layer reference resistance and a lower layer reference resistance; S2, performing first constant temperature closed loop control on the upper layer measurement heating unit to maintain its resistance at the upper layer reference resistance, and performing second constant temperature closed loop control on the lower layer active heat insulation unit to maintain its resistance at the lower layer reference resistance; S3, collecting a measurement signal required for maintaining the constant temperature of the upper layer measurement heating unit; S4, combining the reference temperature to perform temperature drift compensation on the measurement signal, and inputting the instantaneous mass flow of the output fluid in the calibration model. The application can effectively improve the proportion of forced convection heat exchange in total heat exchange, inhibit the heat conduction loss of the base and reduce the system thermal inertia, and improve the dynamic response frequency band and high-frequency measurement accuracy of mass flow measurement.

This application discloses a deep-sea quantum-based mixed-phase flow meter and its measurement method with online self-calibration function. The flow meter includes a fluid channel divided into at least three independent metering units by a throttling component, a CZT detector corresponding to each metering unit, and a processor. The method includes: acquiring measured quantum counts at at least three energy levels for each metering unit; calculating the fluid mixing density using the third energy level count, which is dominated by the Compton effect; calculating the correction value of the oil phase quantum reaction cross-section parameter by combining the operating gas density and the historical water content of the fluid; and finally calculating the flow rate of each phase by combining the correction value of the oil phase quantum reaction cross-section parameter with the low-energy level count. This application utilizes the density-sensitive characteristics of high-energy-level quantum particles to construct a closed-loop correction, solving the problem of parameter failure caused by time or temperature drift in crude oil properties, and realizing high-precision online self-calibration in deep-sea environments.

The application discloses a kind of tobacco flow detection system and method based on multi-sensor fusion, belong to tobacco processing equipment technical field, main design concept includes: by a plurality of high-frequency microwave radar and flat plate capacitive sensor of uniform distribution in the circumferential direction of pipeline constitute sensing module, for obtaining multi-section flow velocity and dielectric constant;Intelligent cleaning module is linked with sensing module, when the signal quality of sensing module is monitored below threshold value, automatically trigger cleaning;Signal processing module is used for executing multi-source data fusion, weighted average flow velocity calculation and flow velocity density coupling compensation, to dynamically correct density value, and finally calculate instantaneous and cumulative weight flow;Further, data can be uploaded to production management system by display and communication module.The application realizes on-demand cleaning, full-section flow velocity coverage and dynamic density compensation, significantly improves measurement accuracy, system reliability and intelligent level.

A system (400), method and computer program product are disclosed for indirect measurement of the volumetric flow (453) generated by a compressor (110) in an environment with a known intake pressure. The compressor is connected with a measuring volume extending up to a closed check valve in the downstream of the compressor. The check valve is adapted for separating the compressor from a piping system supplying consumers. A pressure sensor is located between the compressor and the check valve. An activation module (410) sends activation instructions (I1) to the pressure sensor for capturing a time series of pressure values (p*) and corresponding time stamps (t*) at a sampling rate which is set to capture three to one hundred pressure values during the time needed by the compressor to pump up the measuring volume to an operational working pressure where the check valve opens. Upon activation of the compressor, the system stores the captured pressure values with their time stamps in a memory (420). A regression module (430) computes the slope (433) of a linear regression line for the pressure values captured during a regression time window between the activation timepoint of the compressor and the time point when the compressor reaches the operational working pressure. The volumetric flow (453) generated by the compressor is computed by multiplying the slope (433) with a proportionality factor defined as the ratio of the measuring volume to the intake pressure.

The application provides a large-diameter wind tunnel gas flow measurement method and device. The method comprises the following steps: obtaining a flow field parameter of a target pipe section; obtaining an average differential pressure of the target pipe section according to the flow field parameter; obtaining a flow field distortion coefficient according to the flow field parameter and the average differential pressure of the target pipe section; performing numerical conversion on the average differential pressure of the target pipe section and an initial working condition parameter to obtain a numerical average differential pressure and a target working condition parameter; performing differential pressure correction on the numerical average differential pressure according to the flow field distortion coefficient to obtain a corrected differential pressure; obtaining an initial mass flow rate according to the corrected differential pressure and the target working condition parameter; and performing error correction on the initial mass flow rate according to the error between a preset calibration mass flow rate and the initial mass flow rate to obtain a measurement result of the gas flow. The application improves the accuracy of the measurement result.

Disclosed techniques enable indirect measurement of the volumetric flow generated by a compressor in an environment with a known intake pressure. The compressor is connected with a measuring volume extending up to a closed check valve downstream of the compressor. The check valve is adapted for separating the compressor from a piping system supplying consumers. An activation module sends activation instructions to a pressure sensor for capturing a time series of pressure values and corresponding time stamps A regression module computes the slope of a linear regression line for pressure values captured during a regression time window between the activation timepoint of the compressor and a time point when the compressor reaches the operational working pressure. The volumetric flow generated by the compressor is computed by multiplying the slope with a proportionality factor defined as the ratio of the measuring volume to the intake pressure.

Fuel cell system (2) comprising at least one fuel cell (4) having an anode and a cathode (8), and an air supply system (10) configured and designed to supply air from the environment (12) to the at least one fuel cell (4). The air supply system (10) comprises a hot-film HFM sensor (16) and a PFM sensor (20) configured and designed to measure the air mass flow rate (q). Kath ) from a pressure, a pressure difference and a temperature of the airflow. The air supply system (10) is designed and configured to determine the air mass flow rate (q). Kath ) at low air mass flows using the HFM sensor (16) and to determine the air mass flow (q Kath ) to determine at medium to high air mass flows using the PFM sensor (20).

A bulk feed truck unloading flow detection method and system based on visual recognition, in the method, the reference density is calculated based on the full load initial mass and volume, and the real-time spatial form of the feed surface is obtained periodically during the unloading process. By comparing the spatial boundary changes of adjacent periods and the initial state, the incremental discharge volume and the cumulative discharge volume are calculated respectively. Then, the unloading space evolution ratio is obtained by using the ratio of the cumulative discharge volume to the initial total volume, and the density compensation coefficient is mapped to dynamically correct the reference density to obtain the instantaneous equivalent density. Finally, the incremental unloading mass of the current period is obtained by multiplying the incremental discharge volume and the instantaneous equivalent density, and the real-time cumulative unloading total mass is finally obtained by accumulation. The application is used to improve the accuracy of unloading mass flow detection, and further improve the refinement degree of the intelligent monitoring system of agricultural products in the precise feeding program control of feed.

An ERT system is disclosed for measuring mass flow rate of a solid product carried within an electrically conductive slurry in a pipeline. The system comprises first and second sensing modules to be placed on an interior surface of the pipeline, one downstream of the other, each sensing module comprising an array of electrodes that intersect a common cross-sectional plane and are circumferentially spaced from one another to act as signal transmitting and signal receiving electrodes. Only the first of the sensing modules is associated with a data acquisition module and with an image construction module that serve to determine the distribution of the product within the cross-sectional plane of the first module. A processor is provided for correlating raw signals generated at different times at corresponding receiving electrodes in the two sensor modules to determine the flow velocity of the product and thereby enable calculation of the mass flow rate of the product.