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公开(公告)号：US11073499B2
公开(公告)日：2021-07-27
申请号：US16302769
申请日：2017-04-17
Applicant: Endress+Hauser Flowtec AG
Inventor： Alfred Rieder , Gerhard Eckert , Ennio Bitto , Hao Zhu
Abstract: A measuring transducer includes a support body, a curved oscillatable measuring tube, an electrodynamic exciter, at least one sensor for registering oscillations of the measuring tube, and an operating circuit. The measuring tube has first and second bending oscillation modes, which are mirror symmetric to a measuring tube transverse plane and have first and second media density dependent eigenfrequencies f1, f3 with f3>f1. The measuring tube has a peak secant with an oscillation node in the second mirror symmetric bending oscillation mode. The operating circuit is adapted to drive the exciter conductor loop with a signal exciting the second mirror symmetric bending oscillation mode. The exciter conductor loop has an ohmic resistance RΩ and a mode dependent mutual induction reactance Rg3 which depends on the position of the exciter. The exciter is so positioned that a dimensionless power factor pc 3 = 4 · R Ω · R g 3 ( R Ω + R g 3 ) 2 has a value of not less than 0.2.
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公开(公告)号：US20210003491A1
公开(公告)日：2021-01-07
申请号：US16956940
申请日：2018-12-10
Applicant: Endress+Hauser Flowtec AG
Inventor： Stefan Pflüger , Wolfgang Drahm , Hao Zhu
Abstract: Method for continuous determining of fat content of milk having variable solids fractions and flowing with variable gas content in a pipeline, comprising: ascertaining a value for velocity of sound and an average density value for milk flowing in the pipeline based on eigenfrequencies of at least two bending oscillation wanted modes of measuring tubes of a densimeter arranged in the pipeline; ascertaining a value for static pressure in the pipeline by means of a pressure sensor connected to the pipeline; ascertaining a value for gas volume fraction based on the value for the velocity of sound, the value for the average density and the value for the pressure; ascertaining a value of density of milk flowing in the pipeline without gas content based on the value for the average density and based on the value for the gas volume fraction; ascertaining a value for permittivity of milk flowing in the pipeline based on at least one measuring of propagation velocity and/or absorption of microwaves in the milk by means of a microwave sensor arranged in the pipeline; and calculating fat fraction based on the value of the density of the milk flowing in the pipeline without gas content and the value for the effective permittivity.
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53.发明申请公开(公告)号：US20200278231A1
公开(公告)日：2020-09-03
申请号：US16759523
申请日：2018-10-02
Applicant: Endress+Hauser Flowtec AG
Inventor： Hao Zhu
IPC: G01F1/84
Abstract: The present disclosure relates to a mass flow meter according to the Coriolis principle, comprising two measuring tube pairs which have different usage mode natural frequencies, an exciter for exciting flexural vibrations and a vibration sensor pair for detecting flexural vibrations; and comprising a circuit for driving the exciters and for detecting signals of the vibration sensors, for determining flow-dependent phase differences between the signals of the inlet-side and outlet-side vibration sensors and for determining mass flow measurement values based on the flow-dependent phase differences, wherein the circuit is configured to perform, when determining the mass flow measurement values based on the flow-dependent phase differences, a zero-point correction for the first measuring tube pair and/or the second measuring tube pair using signal amplitude ratios of the measuring tube pairs.
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公开(公告)号：US10724883B2
公开(公告)日：2020-07-28
申请号：US15749888
申请日：2016-07-26
Applicant: Endress+Hauser Flowtec AG
Inventor： Hao Zhu , Alfred Rieder , Gerhard Eckert
Abstract: The invention relates to a method for ascertaining a physical parameter of a gas using a measuring transducer having a measuring tube for conveying the gas, wherein the measuring tube is excitable to execute bending oscillations of different modes and eigenfrequencies, the method includes: ascertaining the eigenfrequency of the f1-mode and f3-mode; ascertaining preliminary density values for the gas based on the eigenfrequencies of the f1-mode and f3-mode; ascertaining a value for the velocity of sound of the gas, and/or, dependent on the velocity of sound and the eigenfrequency of a mode, at least one correcting term and/or density error for the preliminary density value; and/or a correcting term for a preliminary mass flow value for determining a corrected mass flow measured value based on the first preliminary density value, the second preliminary density value, the eigenfrequencies of the f1-mode and f3-mode.
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公开(公告)号：US10705055B2
公开(公告)日：2020-07-07
申请号：US15531787
申请日：2015-11-03
Applicant: Endress + Hauser Flowtec AG
Inventor： Hao Zhu , Alfred Rieder , Wolfgang Drahm , Michael Kirst
Abstract: A measuring transducer comprises two flow dividers having, in each case, two tubular chambers separated from one another and adapted for guiding in- and out flowing fluid, of which each has a chamber floor, in which are formed, in each case, two mutually spaced flow openings communicating with a lumen of the chamber, and as well as a tube arrangement having at least four measuring tubes connected to the flow dividers for guiding flowing fluid with parallel flow. Moreover, the measuring transducer comprises an electromechanical exciter mechanism for exciting mechanical oscillations of the measuring tubes as well as a sensor arrangement for registering oscillatory movements of the measuring tubes and for generating at least two oscillation measurement signals representing oscillations of at least one of the measuring tubes. The measuring system includes besides the measuring transducer also transmitter electronics electrically connected therewith for activating the exciter mechanism and for processing at least one of the oscillation measurement signals generated by the sensor arrangement.
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Patent Agency Ranking
公开(公告)号：US20250020563A1
公开(公告)日：2025-01-16
申请号：US18714644
申请日：2022-11-28
Applicant: Endress+Hauser Flowtec AG
Inventor： Stefan Pflüger , Hao Zhu , Wolfgang Drahm
Abstract: A method for detecting a foreign body in a flowable medium includes determining a first time curve of a first measured value using a first measuring device for determining a physical density of the medium. The method also includes determining a second time curve of a second measured value using a second measuring device for ascertaining a relative permittivity of the medium. A temporal correlation between the first curve and the second curve is determined, and pairs of measured values of the first measured value and the second measured value are detected. The method further includes checking whether the detected pairs of measured values within a predefined tolerance interval correspond to the correlation of at least one predefined function. If this is not the case, it is established that the foreign body is present in the medium.
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公开(公告)号：US20240418553A1
公开(公告)日：2024-12-19
申请号：US18814841
申请日：2024-08-26
Applicant: Endress+Hauser Flowtec AG
Inventor： Ennio Bitto , Hao Zhu , Martin Josef Anklin , Wolfgang Drahm
IPC: G01F1/84
Abstract: A measuring tube arrangement of a measuring device for detecting a mass flow rate of a flowable medium includes: two measuring tubes for conducting the medium, wherein the measuring tubes each have an inlet and an outlet, wherein the measuring tubes are bent at least once between the inlet and outlet; a coupler arrangement for mechanically coupling the two measuring tubes, wherein the coupler arrangement has at least two coupler elements, wherein one coupler element is arranged at the inlet, and one coupler element is arranged at the outlet; two magnet arrangements, each having at least two magnets, arranged on the measuring tubes, wherein precisely one magnet arrangement is arranged on one measuring tube; and a connecting body configured to mechanically detachably connect the measuring tube arrangement to a carrier unit, wherein the connecting body is connected to the inlet and to the outlet of the respective measuring tubes.
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公开(公告)号：US12117325B2
公开(公告)日：2024-10-15
申请号：US17607962
申请日：2020-03-31
Applicant: Endress+Hauser Flowtec AG
Inventor： Hao Zhu , Alfred Rieder , Yaoying Lin
CPC classification number: G01F1/8436 , G01N9/002 , G01N11/16 , G01F1/8477 , G01N2009/006
Abstract: The disclosure relates to a measuring device for characterizing a non-homogeneous, flowable medium, and for determining the density, the mass flow rate and/or the viscosity of the medium measuring tube for guiding the medium. includes at least one mode of oscillation, the natural frequency of which depends on the density of the medium An exciter for exciting the mode of oscillation and an operation and evaluation circuit designed to apply an excitation signal to the exciter, to capture signals from the oscillation sensor, to determine current values of the natural frequency of the oscillator and fluctuations of the natural frequency on the basis of the signals from the oscillation sensor.
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59.发明授权公开(公告)号：US12098944B2
公开(公告)日：2024-09-24
申请号：US17754074
申请日：2020-08-20
Applicant: Endress+Hauser Flowtec AG
Inventor： Alfred Rieder , Hao Zhu , Wolfgang Drahm , Andreas Güttler
Abstract: An arrangement includes a pipeline and a Coriolis volumetric flow meter for measuring a mass flow rate of a medium flowing through the pipeline. A first pressure sensor is attached at an inlet-side of the pipeline and a second pressure sensor is attached at an outlet-side of the pipeline, or wherein a differential pressure sensor is configured to detect a difference between an inlet-side and an outlet-side. The pressure sensors and/or the differential pressure sensor are configured to measure a media pressure and to determine, for each differential pressure, a volumetric flow velocity of the medium through the pipeline. A first monitoring sensor is attached at an inlet-side portion of the pipeline and a second monitoring sensor is attached at an outlet-side portion of the pipeline, wherein the monitoring sensors are configured to monitor a measurement variable different from the media pressure to identify a static media state.
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公开(公告)号：US12018966B2
公开(公告)日：2024-06-25
申请号：US17416067
申请日：2019-11-21
Applicant: Endress+Hauser Flowtec AG
Inventor： Hao Zhu , Reinhard Huber , Gerhard Eckert , Marco Oliver Scherrer
CPC classification number: G01F1/8431 , G01F1/8436 , G01F1/8477 , G01F15/024 , G01F15/10 , G01F15/14
Abstract: The flow measuring system comprises a measuring transducer having a tube arrangement to convey a flowing fluid, an exciter arrangement for forced mechanical oscillations of the tube arrangement, and a sensor arrangement for registering mechanical oscillations of the tube arrangement. The measuring system further comprises a measuring and operating electronics electrically coupled with the exciter arrangement and the sensor arrangement. The measuring system has two driver circuits and two measurement transmitter circuits. The tube arrangement includes two flow dividers and four connected tubes adapted to be flowed through by the measured substance. The exciter arrangement includes two oscillation exciters, and the sensor arrangement includes four oscillation sensors. The first measurement transmitter circuit processes measurement signals from two oscillation sensors and outputs such to the second measurement transmitter circuit The second measurement transmitter circuit processes oscillation measurement signals of the other two oscillation sensors and ascertains total flow measured values.
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