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US 4,228,815 AGranted
Measurement and control of multicomponent liquid systems
AssigneeBayer Aktiengesellschaft
InventorsRichard Juffa, Georg Wawra, Walter Uerdingen
Life of this patent
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AssigneeBayer Aktiengesellschaft
InventorsRichard Juffa, Georg Wawra, Walter Uerdingen
Estimating the term…
The method is based on the fact that the particular components are conveyed through separate pipes into a mixing chamber. By measuring the transit time in at least one of the pipes the flowrate can be measured. The flow in the other pipes which is in a fixed ratio to the first flow is then adjusted automatically. For measuring the transit time a heat pulse is injected in at least one of the pipes and the transit time of the heat impulse is measured. The so-measured transit time is converted into an inversely proportional voltage and the flowrate in the other pipes is adjusted proportionally to this voltage. An apparatus is provided for practicing the method. The apparatus comprises flow measuring elements which are electrical connected to control devices which operate flow control devices in the pipes leading to the mixing chamber.
An apparatus for dosing multicomponent liquid systems, comprising a mixing chamber, a plurality of pipes connected to the mixing chamber, in at least all but one of which is arranged on electrically activated dosing device, a heating wire arranged in at least the optionally dosing device free pipe and downstream of the heating wire a thermoelectric heat sensor, the heat sensor being electrically connected to an amplifier and a voltage comparator, means for producing periodic heat impulses by passing a current through the heating wire, an electric pulse generator supplying pulses into a counter during the transit time where a heat impulse travels from the heating wire to the thermoelectric sensor, a storing unit for storing the counter content until the next following heat impulse reaches the thermoelectric sensor, a code converter for converting the counter content into a quantity in the binary code which is proportional to the flow rate, a digital-analog converter for reconverting this quantity into an analogous signal and amplifier means for amplifying the analogous signal, being connected to electrically activated dosing devices in the other pipes, the dosing rate of which is proportional to the voltage applied.
An apparatus for dosing multicomponent liquid systems, comprising a mixing chamber, at least all but one of the conduits of all which are provided with dosing devices, characterized in that at least one of the conduits to the mixing chamber is provided with a transit time measuring unit to determine the flowrate, comprising a heater which is centrally mounted in the conduit and downstream in this conduit a thermoelectric sensor, being connected via an amplifier and a comparator with the reset input of a bistable multivibrator, the multivibrator activating during its set time a gate for the transit time of a heat plug generated by said heater to receive pulses from an impulse generator and the counted pulses in a counter are summed up and stored in a digital counter which is connected to an electric code-converter and digital to analog converter, which produces an electric signal proportional to the flowrate, said signal being amplified in a power amplifier and the power amplifier being connected to an electrically activated dosing device in each other conduit, the dosing rate of which is proportional to the applied voltage.
An apparatus for dosing multicomponent liquid systems comprising:
An apparatus for dosing multicomponent liquid systems comprising:
A method for dosing multicomponent liquid systems in which the liquids have viscosities between about 50 and 2000 cP;
Dependencies are inferred from the claim text.