摘要:
A force balanced mass flow meter is disclosed that includes a cylindrical sensor housing having an interior bore, an impeller body supported for axial rotation within the interior bore of the sensor housing , and including structure for converting fluid inertia into flow induced torque when fluid flows relative to the impeller body, a proximity sensor for measuring a rotation angle of the impeller body relative to the sensor housing, an electromagnet for generating a magnetic field about the sensor housing to prevent rotation of the impeller body, electronics for determining electrical values from the proximity sensor when fluid flows relative to the impeller body and a controller for controlling current supplied to the electromagnet in response to electrical values determined from the proximity sensor, to generate a magnetic field sufficient to prevent impeller rotation.
摘要:
The present invention relates to a method and relevant electronic device (10) for determining the hydraulic flow rate in a pump driven by a synchronous electric motor (12), said motor (12) being of the type comprising a rotor (14), equipped with a permanent magnet, which is rotation-driven by the electromagnetic field generated by a stator (16) equipped with pole pieces (18) with relevant windings. The method comprises an indirect measuring of the flow rate through the following steps of: acquiring at least one pump operation variable; comparing the value of said variable with a predetermined correlation table to hydraulic flow rate values and determining a corresponding flow rate value.
摘要:
Magnetic flow meters is suggested, which employs a floating member, made of magnetically responsive material and residing within a tubular conduit, through which the fluid flows. The flow meter is provided with a means for producing magnetic field in the conduit and generating a response signal upon displacement of the float member caused by the flowing fluid. Flow rate value is obtained by processing the response signal and comparing it with a calibration curve.
摘要:
The present invention relates to a method and relevant electronic device (10) for determining the hydraulic flow rate in a pump driven by a synchronous electric motor (12), said motor (12) being of the type comprising a rotor (14), equipped with a permanent magnet, which is rotation-driven by the electromagnetic field generated by a stator (16) equipped with pole pieces (18) with relevant windings. The method comprises an indirect measuring of the flow rate through the following steps of:
acquiring at least one pump operation variable; comparing the value of said variable with a predetermined correlation table to hydraulic flow rate values and determining a corresponding flow rate value.
摘要:
2.1 Bei einer derartigen Vorrichtung tritt ein Fehler auf, der darauf beruht, daß die Vorrichtung auch die Masse der infolge der Pulsation zurückströmenden Luft ermittelt. 2.2 Hiergegen weist die neue Vorrichtung die Merkmale auf, daß auf dem Träger (2) ein zweiter Massenstromsensor (4) in Luftströmungsrichtung hinter dem ersten angeordnet ist, wobei jeder Massenstromsensor (3, 4) in einer Brückenschaltung mit dem Ausgangsstrom eines Regelverstärkers (14, 15) beaufschlagt ist und in jeweils einem Brückenzweig Temperatursensoren (9, 10) angeordnet sind, die auf einem weiteren Träger (8) angeordnet und der Luftströmung ausgesetzt sind, der mit Abstand zum ersten Träger (2) angeordnet ist, daß die an den Eingangsanschlüssen (6) der beiden Massenstromsensoren (3, 4) anliegenden Spannungen U M1 , U M2 einer elektronischen Schaltung (16) zugeführt werden und in dieser nach der Formel U A = U M1 + K (U M1 - U M2 ) U M2 umgeformt werden, wobei der Wert U A das Ausgangssignal der Vorrichtung für den Luftmassendurchsatz und K ein Anpassungsfaktor ist. 2.3 Hierdurch wird bei verringertem Bauteileaufwand eine Kompensation des durch Pulsation verursachten Meßfehlers erreicht. Damit ist die Vorrichtung für eine Verwendung bei Brennkraftmaschinen geeignet.
摘要:
In this flow meter, a detector (5) is fitted slidably in a cylindrical chamber (3a) in a meter body (2), and a fluid is introduced at a predermined angle from introduction passages (17) into the interior of this detector (5), the fluid introduced into the detector (5) being discharged at a predetermined angle to the interior of the meter body (2) through discharge passages (13). A force generated by a variation in momentum of the fluid is applied to the detector (5), and this force is detected by a load measuring instrument (6) and thereby momentarily determines a mass flow rate of the fluid. Thus, a variation in momentum is generated in the fluid by the introduction passages (17) and discharge passages (13), and the force produced by the momentum variation is applied to the detector (5), the force applied to the detector (5) being detected by the load measuring instrument (6). Accordingly, the mass flow rate of a cavitation-generating fluid and a bubble-containing fluid can be measured accurately without being influenced by variations in viscosity thereof resulting from variations in temperature.
摘要:
A method and apparatus for sensing the mass flow of a fluid and for generating an output signal representative of the sensed mass flow are shown to include a conduit formed from resistive material, a voltage source connected to a first point on the conduit, for providing a voltage to the first point in response to a control signal, a differential amplifier wherein the output of the amplifier is representative of the difference in voltage between a second point on the conduit and a third point on the conduit, and a controller for generating the control signal so that the voltage provided to the first point is regulated in relation to the flow of fluid through the conduit. In an especially preferred embodiment the resistive material is Nickel-52. In a further embodiment, the controller generates the control signal so that the voltage applied to the first point is regulated to maintain the average resistance of the conduit at a desired value. In one embodiment, the desired value is a constant value. In another embodiment, the controller generates the control signal so that the voltage applied to the first point is maintained at a desired value. In this last embodiment, it is preferred to compensate the output signal to account for the cooling of the conduit as the fluid passes therethrough.