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公开(公告)号：US3589185A
公开(公告)日：1971-06-29
申请号：US3589185D
申请日：1969-09-04
申请人： FISCHER & PORTER CO
发明人： BURGESS THOMAS H
CPC分类号： G01F1/3218
摘要： A flowmeter having no moving parts, and including a conduit forming a passage for the fluid to be measured, and an obstacle assembly mounted therein. The assembly is constituted by a contoured block disposed across the conduit, the longitudinal axis of the block being perpendicular to the flow axis of the conduit, and a strip mounted across the conduit behind the block in parallel relation thereto to define a gap which serves to trap Karman vortices created by the presence of the assembly in the flow path. The vortices are sensed to produce a signal whose periodicity is proportional to flow rate.
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公开(公告)号：US3888120A
公开(公告)日：1975-06-10
申请号：US35480373
申请日：1973-04-26
申请人： FISCHER & PORTER CO
发明人： BURGESS THOMAS H
CPC分类号： G01P5/04 , G01F1/3263 , G01P5/01
摘要： A flowmeter including a conduit-forming a passage for the fluid to be measured and an obstacle assembly mounted therein capable of generating strong, stabilized fluidic oscillations which cause a deflectable non-streamlined section of the assembly to vibrate at a corresponding rate. The vibrations are sensed by a strain gauge to produce a signal whose frequency is proportional to the flow rate of the fluid passing through the conduit.
摘要翻译： 一种流量计，其包括形成用于待测量流体的通道的管道和安装在其中的障碍物组件，其能够产生强烈的，稳定的流体振荡，其导致组件的可偏转的非流线型部分以相应的速率振动。 振动由应变计检测以产生频率与通过导管的流体的流速成比例的信号。
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公开(公告)号：US3874234A
公开(公告)日：1975-04-01
申请号：US37411473
申请日：1973-06-27
申请人： FISCHER & PORTER CO
发明人： BURGESS THOMAS H
CPC分类号： G01F1/3209
摘要： A vortex shedding flowmeter in which an obstacle is mounted within a flow conduit to produce periodic vortices whose frequency is a function of the flow rate of the fluid passing through the conduit. The conduit is interposed between an upstream and a downstream pipe section in the line conveying the fluid to be metered. To render the flowmeter insensitive to differences in velocity distribution in the fluid entering the flow conduit, the internal diameter of the conduit is made smaller than that of the upstream pipe section to create a constriction in the flow passage which renders the flow distribution profile more uniform and thereby improves the accuracy and reliability of the meter.
摘要翻译： 涡流脱落流量计，其中障碍物安装在流动管道内以产生周期性涡流，其频率是通过导管的流体的流速的函数。 导管插入在输送待计量流体的管线的上游管段和下游管段之间。 为了使流量计对进入流动管道的流体中的速度分布的差异不敏感，使得管道的内径小于上游管段的内径，以在流动通道中产生收缩，这使得流动分布轮廓更均匀 从而提高了仪表的精度和可靠性。
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公开(公告)号：US3864972A
公开(公告)日：1975-02-11
申请号：US34045573
申请日：1973-03-12
申请人： FISCHER & PORTER CO
发明人： BURGESS THOMAS H , HERZL PETER J
CPC分类号： G01F1/3236
摘要： A signal recovery system coupled to the sensor of a vortex-type flowmeter wherein fluidic variations are induced whose frequency is a function of the flow rate of the fluid. The sensor yields an electrical signal containing a fundamental frequency proportional to the fluidic variations as well as frequency components or noise arising from turbulence in the fluid admitted into the flowmeter. The recovery system includes a voltage-controlled band-pass filter coupled to the sensor to transmit only those frequencies which lie within a narrow range whose center frequency is determined by the applied control voltage and to discriminate against all other frequencies. In order to recover the fundamental frequency from the sensor output and to reject frequencies reflecting hydraulic noise, a control voltage is generated whose level is a function of the existing velocity of the fluid passing through the meter, the control voltage being applied to the filter to adjust the band-pass setting thereof so that the center frequency substantially corresponds to the fundamental frequency in the sensor output. The output of the filter is applied to a Schmitt trigger to provide a square wave whose frequency corresponds to the fundamental frequency, the output of the trigger being indicated to afford a reading of flow rate.
摘要翻译： 耦合到涡流式流量计的传感器的信号恢复系统，其中感应出流体变化，其频率是流体的流速的函数。 该传感器产生一个电信号，该电信号包含与流体流量变化中流体变化成比例的基频，以及由流入流量计进入的流体中的湍流产生的频率分量或噪声。 恢复系统包括耦合到传感器的电压控制带通滤波器，以仅传输位于窄范围内的那些频率，其中心频率由所施加的控制电压确定并区分所有其它频率。 为了从传感器输出恢复基频并且拒绝反映液压噪声的频率，产生控制电压，其电平是通过仪表的流体的现有速度的函数，控制电压被施加到滤波器 调整其通带设置，使得中心频率基本上对应于传感器输出中的基频。 滤波器的输出被施加到施密特触发器以提供频率对应于基频的方波，触发器的输出被指示以提供流量读数。
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公开(公告)号：US3616693A
公开(公告)日：1971-11-02
申请号：US3616693D
申请日：1969-06-16
申请人： FISCHER & PORTER CO
发明人： BURGESS THOMAS H
CPC分类号： G01F1/3236
摘要： A SWIRL-TYPE FLOWMETER WHOSE OUTPUT FREQUENCY IS A FUNCTION OF FLUID-FLOW RATE, THE FREQUENCY BEING SUBSTANTIALLY LINEAR THROUGHOUT A BOARD REYNOLDS NUMBER RANGE. THE METER INCLUDES A FLOW TUBE WHOSE INLET SECTION HAS A SET OF FIXED SWIRL BLADE THEREIN WHICH IMPART A SWIRLING MOTION TO INCOMING FLUID, THE SWIRLING FLOW BEING CAUSED TO PRECESS IN AN ENLARGING SECTION OF THE TUBE. THE PRESESSIONAL MOTION IS DETECTED TO PRODUCE VOLAGE PULSES WHOSE FREQUENCY DEPENDS ON FLOW RATE. TO MAINTAIN THE DESIRED LINEAR RELATIONSHIP BETWEEN FLOW RATE AND FREQUENCY, THE GEOMETRY OF THE SWIRL BLADES AND THE INLET SECTION ASSOCIATED THEREWITH IS MADE SUCH AS TO ACCELARATE FLOW THERETHROUGH TO MINIMIZE BOUNDARY-LAYER SEPARATION ALONG THE SURFACE OF THE BLADES.
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