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Detector for an ultrasonic flow meter

The flow meter is free from an external fluid flow noise. The detector has measuring pipe 1 inlet 2 and outlet 3 both axially lined up with base axis X. Pipe 1 is a straight one with opposite upstream and downstream closed ends, provided in each of which ends is echo sounder 4a, 4b capable of both transmitting and receiving the ultrasound. Inlet 2 is connected with a side of the upstream end via bent 2a. Outlet 3 is connected with another side of the downstream end via another bent 3a, which another side is radially opposite to the former side part in pipe 1 so that pipe 1 is tilted at a certain angle from base axis X which is axially lined up with axes of both inlet 2 and outlet 3; and, a center of base axis X coincides with a center of a flow path of a measured fluid inside pipe 1. (See FIG. 1)

Karman vortex flow meter

A Karman vortex flow meter has detection passages located along a fluid flow in a duct. Flow outlets of the detection passages are disposed on an end face of a vortex generation element and flow inlets are disposed upstream from the flow outlets. Heating coils for detecting flow velocity change of a fluid caused by a negative pressure of a Karman vortex are mounted in the detection passages. A flow meter is used that lessens dust accumulation on heating coils, etc., and reliably detects Karman vortexes.

Integral pump and flow meter device

A pump housing is provided with a conduit extending through the housing between a pump inlet and pump outlet. A pump device is disposed within the housing and in communication with the conduit to pump fluid therethrough. A fluid flow meter also is disposed within the housing and in communication with the conduit to monitor fluid flow rate through the conduit. The fluid flow meter generates signals related to the fluid flow rate which are fed back to a control device operable to control the flow rate through the pump device. The flow meter may include a pair of meshed modified elliptical gears. The modified elliptical gears are based on a true elliptical shape, with bulged portions added between the major and minor axes of the elliptical shape. The modified elliptical gears have involute teeth that are relatively thick adjacent the minor axis and relatively thin adjacent the major axis.

Thermally-sensitive type flow meter having a high accuracy

A thermally-sensitive type flow meter measures a flow rate with a high accuracy by eliminating a noise generated in a source voltage. The flow meter includes a sensor chip comprising a substrate carrying sensing elements. First and second resistors are provided on first and second bridges formed over a depression formed on the substrate. The first bridge is positioned on an upstream side and the second bridge is positioned on a downstream side. The first and second resistors generate a heat by the same voltage source. First and second temperature measuring resistors are provided adjacent to the first and second resistors, respectively, to measure a temperature of the first and second resistors. Third and fourth temperature measuring resistors are provided for measuring the temperature of the fluid. A temperature control unit, including the first, second, third and fourth temperature measuring resistors, controls a temperature of each of the first and second resistors to be constant. A flow rate of the fluid is determined based on a voltage difference between a first voltage applied to the first resistor and a second voltage applied to the second resistor.


Retrievable downhole flow meter
Capacitative electromagnetic flow meter
Ultrasonic flow meter with reduced noise
Coriolis mass flow meter having a thick-walled measuring tube
Detector for an ultrasonic flow meter
Karman vortex flow meter
Coriolis mass flow meter employing non-metallic flow conduit structure
Fluidic volumetric fluid flow meter
Electromagnetic flow meter
Fluid flow meter utilizing pressure sensing
Air flow meter
Fluid flow meter
Liquid flow meter construction
Positive displacement flow meter method and apparatus
Magnetic-inductive flow meter with a measuring tube made of plastic


PAT. NO. Title
201 5717145 Detector for an ultrasonic flow meter
202 5708214 Karman vortex flow meter
203 5704767 Integral pump and flow meter device
204 5703288 Thermally-sensitive type flow meter having a high accuracy
205 5689071 Wide range, high accuracy flow meter
206 5677496 Electromagnetic flow meter removing influence of fluctuation in direct-current offset voltage
207 5672833 Peak flow meter for measuring ventilatory capacity
208 5672832 Chemically inert flow meter within caustic fluids having non-contaminating body
209 5654512 Flexible membrane variable orifice fluid flow meter
210 5654506 Heat type air flow meter
211 5641914 Inductive flow meter
212 5640963 Eye fundus blood flow meter
213 5639965 Oil reclamation system flow meter
214 5627324 Peak flow meter
215 5614681 Karman vortex flow meter
216 5613497 Miniature peak flow meter
217 5594181 Ultrasonic flow meter
218 5589642 High void fraction multi-phase fluid flow meter
219 5583302 Redundant mass flow meter
220 5583300 Dual sensor vortex flow meter
221 5581026 Flow meter
222 5578763 Electromagnetic flow meter
223 5576495 Two phase flow meter
224 5571964 Flow meter
225 5570870 Air flow meter with slide valve for milking machines
226 5565631 Non-metallic flow meter float and method
227 5565630 Peak flow meter
228 5564306 Density compensated gas flow meter
229 5563350 Karman's vortex flow meter
230 5562002 Positive displacement piston flow meter with damping assembly
231 5555190 Method and apparatus for adaptive line enhancement in Coriolis mass flow meter measurement
232 5551305 Apparatus and method for measuring two- or three- phase fluid flow utilizing one or more momentum flow meters and a volumetric flow meter
233 5546801 Water flow meter adapter for residential fire service sprinkler systems
234 5544533 Area flow meter with hall devices having magnetism-responsive surfaces
235 5544527 Flow meter having a main passage and a branch passage partially partitioned into plural regions
236 5540107 Liquid flow meter
237 5520047 Exothermic resistor element and thermal process air flow meter using the same
238 5515734 Variable area flow meter
239 5476013 Mass flow meter
240 RE35114 Fluid flow meter
241 5469746 Electromagnetic flow meter
242 5461930 Apparatus and method for measuring two-or three-phase fluid flow utilizing one or more momentum flow meters and a volumetric flow meter
243 5458004 Volume flow meter
244 5458003 Electromagnetic flow meter
245 5448919 Gas flow meter
246 5426983 Flow meter
247 5419333 Ultrasonic doppler blood flow meter apparatus
248 5415048 Acoustic gas-liquid flow meter
249 5408886 Positive displacement piston flow meter with internal valve
250 5400660 Inductive flow meter

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