公开(公告)号：US3885432A

公开(公告)日：1975-05-27

申请号：US38479273

申请日：1973-08-02

申请人： FISCHER & PORTER CO

发明人： HERZL PETER J

IPC分类号： G01F1/32 ,  G01F1/00 ,  G01P5/08

CPC分类号： G01F1/3236

摘要： A vortex-type mass flowmeter for accurately measuring the mass of fluid passing through a flow tube, the meter being insensitive to background noise resulting from turbulence in the fluid admitted into the flow tube. A bluff body or other means disposed within the tube acts to create a pulsatory fluidic vortex therein whose frequency varies as a function of the volumetric flow rate of the fluid being measured. Placed within the flow tube is a pressure-responsive transducer adapted to generate an electrical signal whose fundamental frequency is proportional to the fluidic pulse rate and whose amplitude is a function of the kinetic energy contained in the vortex. The transducer signal is processed by an operational amplifier, the gain of which is inversely proportional to frequency, thereby effectively dividing the transducer signal by frequency throughout the operating range of the meter to yield an output signal whose amplitude represents mass flow. The output signal is applied to an electronic signal recovery system to filter out all but the fundamental frequency whereby the indicator reading accurately indicates mass flow.

摘要翻译： 一种用于精确测量通过流管的流体质量的涡流型质量流量计，该仪表对于流入流体管内的流体中的湍流产生的背景噪声不敏感。 设置在管内的非流线体或其它装置用于在其中产生脉动流体涡流，其频率随着被测流体体积流量的变化而变化。 放置在流管内的是压力响应换能器，其适于产生基本频率与流体脉冲速率成比例并且其振幅是包含在涡流中的动能的函数的电信号。 传感器信号由运算放大器进行处理，运算放大器的增益与频率成反比，从而在整个仪表的工作范围内有效地将换能器信号除以频率，从而产生幅度为质量流量的输出信号。 输出信号被施加到电子信号恢复系统以过滤除基本频率之外的所有信号，由此指示器读数准确地指示质量流量。

公开(公告)号：US3867839A

公开(公告)日：1975-02-25

申请号：US40064173

申请日：1973-09-25

申请人： FISCHER & PORTER CO

发明人： HERZL PETER J

IPC分类号： G01F1/32 ,  G01F1/00

CPC分类号： G01F1/3263 ,  Y10S73/04

摘要： A flowmeter having a conduit forming a passage for the fluid to be measured and an obstacle assembly mounted therein capable of generating strong fluidic oscillations which cause a deflectable 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. The strain gauge is elastically suspended in a cavity formed within the vibratory section to minimize fatigue and other adverse effects.

摘要翻译： 一种流量计，其具有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，其能够产生强流体振荡，其使组件的可偏转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。 应变仪弹性地悬挂在振动部分内形成的空腔中，以减少疲劳和其他不利影响。

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

IPC分类号： G01F1/32 ,  G01R19/00 ,  G08C25/00 ,  G01F1/00 ,  G01P5/00

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。