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Air flow meter

In a thermal type air flow meter, a temperature-dependent resistor for sensing the flow rate of air is placed in the flow of air to be measured, and another resistor for detecting a current flowing through the above resistor is connected in series therewith. The current is controlled so that the temperature-dependent resistor is kept at a predetermined temperature which is higher than surrounding temperature by, for example, 150.degree. C. The resistance of the temperature-dependent resistor varies in accordance with the flow rate of air. However, since the current is controlled so that the temperature-dependent resistor is maintained at the predetermined temperature, the current varies with the flow rate of air. Accordingly, the speed of air can be obtained by measuring the current. In such an air flow meter, when a key switch of an engine is turned on to put a power supply to work, a short circuit is formed between both ends of the current detecting resistor to cause a large current to flow through the temperature-dependent resistor. Accordingly, the flow rate of air can be measured immediately after the power supply has been turned on.

Flow meter including improved laminar flow restrictor device therefor

This disclosure relates to a flow meter having an improved flow restrictor for creating laminar flow in the flow meter. The improved flow restrictor is an adjustable bypass or flow restrictor which comprises a stack of alternate slotted discs and non-slotted, smaller diameter, washers with a diameter of 80% of the slotted discs, to form a plurality of micro-channels 0.09 mm square and 3 mm long which is a length to area ratio sufficient to assure laminar fluid flow through the flow meter.

Mass air flow meter

A mass air flow meter for an internal combustion engine is described in which the mass air flow into the engine is determined by the measured throttle angular position, the sensed pressure above the throttle and a stored schedule of values dependent upon the ratio of the pressure below the throttle to the pressure above the throttle.

Fluid flow meter

A fluid flow meter having a paddle wheel rotatably mounted in a cylindrical cavity and an inlet conduit and an outlet conduit tangentially aligned with the periphery of the cavity for directing a fluid to flow through it. The paddle wheel's axis of rotation is displaced from the cavity's centerline, in the direction of the inlet conduit and substantially perpendicular to the flow of fluid entering the cavity, such that the flow meter operates effectively over an extended range of Reynolds numbers, spanning both turbulent and laminar flows.


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
501 4450719 Air flow meter
502 4450718 Flow meter including improved laminar flow restrictor device therefor
503 4446523 Mass air flow meter
504 4440030 Fluid flow meter
505 4440029 Impact flow meter
506 4440028 Protective shield for flow meter sight glass
507 4437349 Vortex flow meter frequency adjustment
508 4437344 Compound liquid flow meter with fast crossover characteristic
509 4435978 Hot wire anemometer flow meter
510 4434670 Fluid flow meter
511 4433583 Flow meter
512 4429571 Compound liquid flow meter
513 4423627 Flow meter
514 4419899 Electromagnetic flow meter
515 4409846 Electromagnetic flow meter
516 4409830 Wave velocity detecting schemes for traveling wave flow meter
517 4404846 Air flow rate measuring device incorporating hot wire type air flow meter
518 4403871 Heat-meter and flow-meter apparatus
519 4399709 Flow meter
520 4393724 Flow meter having a rotary body
521 4393723 Fluid flow meter
522 4389901 Fluid flow meter
523 4389897 Impeller flow-meter pulsation damping
524 4388835 Fluid flow meter
525 4388003 Heat-meter and flow-meter apparatus
526 4385526 Flow meter
527 4381680 Mass flow meter
528 4380934 Gaseous fluid flow meter utilizing karman vortex street
529 4375767 Flow-through flow meter with ultrasound
530 4375169 Turbulence conveyor flow meter
531 4373387 Air flow meter
532 4372147 Flow meter prover apparatus and method
533 4358954 Traveling wave flow meter
534 4353251 Mounting apparatus for liquid flow meter
535 4346607 Fluid flow meter with improved sealing means
536 4344331 Fluid flow meter
537 4343191 Fluid flow meter
538 4329130 Flow meter with helical toothed rotors having no pulsation and zero contact pressure
539 4325127 Flow meter system
540 4320655 Quantity of flow meter
541 4315523 Electronically controlled flow meter and flow control system
542 4314483 Mass rate of flow meter with improved temperature characteristics
543 4307405 Flow meter recording device
544 4301686 Mass rate of flow meter with improved magnetic circuit
545 4300402 Flow measuring needle and orifice for flow meter
546 4291584 Stalled turbine flow meter
547 4291583 Drag flow meter
548 4291582 Mass rate of flow meter with phase shift compensation
549 4282761 Fluid flow meter
550 4282760 Multiphase fluid flow meter (D#76244)

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