A way to automatically control the liquid level in the tank

 

(57) Abstract:

The invention relates to mechanical engineering and can be used in the national economy for regulating the liquid level in the tank. The purpose of the invention is to simplify the construction, increase accuracy and reliability. The invention allows to convert the capacitance change of the sensor into an electrical signal, which is then converted into an electrical impulse corresponding duration. The duration of this pulse is compared with the set values of the two additional pulses corresponding to the lower and upper liquid level in the tank, and upon the results of the comparison form of the control law. 1 Il.

 

Same patents:

FIELD: physics, measuring.

SUBSTANCE: system contains a consistently joined comparison device - the adder, a digital controller of the fluid flux rate, object the regulations sweepped by a feedback, digital correcting proportional and integrated controllers, comparison devices, the block of insert of a correcting proportional controller and the filter of low frequencies. Current values of level of a fluid in capacity-collection from an exit of object of regulation arrive on an inlet of the filter of low frequencies and on an inlet of the block of insert of a correcting proportional controller.

EFFECT: increase of dynamic accuracy of regulation of the rate of flux of a fluid on level in capacity-collection in the conditions of activity of various perturbations at the expense of digital correction under the integrated law of the assignment to a controller of the rate of flux of a fluid on the filtered (rounded) values of level and insert of proportional correction making in algorithm at an exit of level from field of the "smooth" regulation.

1 dwg

FIELD: machine building.

SUBSTANCE: invention relates to field of computer-aided manufacturing in machine building and is provided for workflow automation, related to control and regulation of liquid mediums. Device is structurally implemented in the form of two functional assemblies and allows two programming leads of functional capabilities and four outlets. At closed programming leads device is transformed into monitoring and regulation system of liquid level with usage of the first and the second outlets of device, providing monitoring mode and keeping of liquid level at fixed height and mode of filling and emptying of a reservoir with liquids. At open programming leads device is transformed into set of level control of top and bottom levels of controlled liquid of conducted type, outlets of which are correspondingly the third and the fourth outlets of the device. Device provides vertical, horizontal and complex (vertical installation of one and horizontal installation of other functional assembly) methods of installation. Device provides setting of control accuracy of liquid level in control mode and keeping of liquid level at its fixed height. Invention provides control of loads in the form of electromagnetic relay, two windings of contactor starter and outlets of logic elements.

EFFECT: extended capabilities of device by means of providing of regulation of liquid flows level at fixed height with ability of programming of its functional capabilities and nomenclature increasing of controllable loads and methods of its installation.

5 dwg

FIELD: machine building.

SUBSTANCE: invention relates to field of computer-aided manufacturing in machine building and is provided for workflow automation, related to control and regulation of liquid mediums. Device is structurally implemented in the form of one functional assembly, including conductometric sensor of liquid level, connected to sensitivity control, detectors, connected to second lead sensitivity control, threshold elements, connected to detectors, differentiator, unit for placement into initial state, JK- trigger, monostable circuit, replicator and indicator units. Additionally device contains three programming leads of its functional capabilities and four outlets. At closed first and second programming leads and connection of the third programming lead to third device outlet it is transformed into control and regulation system of liquid level with its agitated surface and usage of the first and the second outlets of device, providing verification and liquid level control mode at fixed height. At opened first and second programming leads and connected to each other third programming lead and third outlet of the device it is transformed into monitoring and regulation system of liquid with its smooth surface in the mode of monitoring and keeping of liquid level at its fixed height. At disconnected programming leads device is transformed into warning assembly of monitoring of top level of liquid with usage of the third outlet of device or warning assembly of monitoring of bottom level of liquid with usage of fourth outlet of device. Device provides vertical and horizontal methods of erection.

EFFECT: expansion of functional capabilities of the device and increasing of nomenclature of controllable loads and methods of its erection and also improvement of operational performance.

5 dwg

FIELD: physics; control.

SUBSTANCE: invention relates to automation of manufacturing processes in machine building and is meant for automating technological processes related to monitoring and controlling liquid media. The device is made in form of two functional assemblies and has three terminals for programming its functionalities and four outputs. The device has two level sensors, two multivibrators, capacitors, two detectors, two sensitivity controllers, two threshold elements, a differentiator, a JK flip-flop, a unit for establishing initial state, two repeaters and two display units. When the first and second programming terminals are closed and when the third programming terminal is connected to the third output, the device is transformed into a system for monitoring and controlling liquid level with its excited surface using the first and second outputs, which provides the mode for monitoring and maintaining the liquid level at a fixed height and the mode for filling and emptying the reservoir. When the first and second programming terminals are open and the third programming terminal is connected to the third output, the device is transformed into a system for monitoring and controlling liquid with its calm surface in the mode for monitoring and maintaining the liquid level at a fixed height and in the mode for filling and emptying the reservoir. The device provides vertical, horizontal and combined (vertical mounting of one and horizontal mounting of the other functional assembly) mounting methods.

EFFECT: increased functionalities of the device and wider range of controlled loads and mounting methods.

6 dwg

FIELD: transport, distribution.

SUBSTANCE: proposed method comprises filling the tank with fluid and semi-fluid mixes, setting volumetric portion of mixes and draining said tank in dispensing said mixes. Mix level capacitive transducer is arranged inside tank along its height to be filled with mixes at a time with said tank. Structural characteristics of transducer and electrical performances depending thereon are invariable over its height in empty state of both transducer and tank. Maximum and minimum tank mix levels are set by appropriate transducers. Tank filling is terminated when mix level reaches that of mix top level transducer and started when it reaches that of mix bottom level transducer. Electric oscillation signal is generated at capacitive transducer. Electric oscillation signal amplitude is measured at capacitive transducer. Mix level signal is generated subject to measured electric oscillation signal amplitude at capacitive transducer. With top level transducer level reached by mix level, product of height from tolerable top to bottom mix levels and said electric oscillation amplitude is determined for said time interval. Mix level signal is corrected in relation to measured electric oscillation signal amplitude at capacitative transducer. With tank drained at beginning of another proportioning cycle, initial mix level generated signal is determined. Final proportioning mix level signal is defined as difference between mix level initial signal and quotient of mix volumetric portion and tank horizontal section inner area. Definite final level signal is compared with corrected mix level signal to terminate volumetric proportioning of mixes if said signals are equal. Proposed device comprises tank, mix level capacitative transducer, mix top and bottom level transducers, electric oscillation generator, signal transducer, pump and shutter control unit, pump and shutter assemblies and mix measured level indicator. Output of said generator is connected with capacitative transducer and signal transducer input. Mix top level transducer output is connected to first input of pump and shutter control unit with its second input and outputs connected to mix top level transducer output and appropriate inputs of pump and shutter assembly. Proposed device comprises also selector, setter of top measured mix level signal, mix portion and next mix proportioning moment start, computer and comparator. Signal transducer output is connected to computer first input and selector first signal input. To selector second control input connected is connection of mix top level transducer output, pump and shutter control unit first input and comparator output. Selector output is connected with computer second input. Computer third and fourth inputs are connected to first and second outputs of top measured mix level and next proportioning moment setting unit. Computer first input is connected to mix measured level indicator input and comparator first inverting input while its second output is connected to comparator second non-inverting input.

EFFECT: higher accuracy of control and proportioning.

2 cl, 3 dwg

FIELD: physics.

SUBSTANCE: system (10) for filling a drinking container (20) with a beverage, having a first measuring device (12a; 12) which determines the maximum filling level (21) of the drinking container (20), which is defined by the top edge (21) of the drinking container (20); the measuring device (12a, 12, 12b) at least periodically determines the actual filling level (23), where in the system (10), a control means (13) automatically stops the filling level once the actual filling level (23) essentially matches the set filling level (22), wherein the set filling level (22) is determined from a predetermined or individually set distance (24) to the maximum filling level (21), wherein the first measuring device (12a; 12; 12b) continuously determines the actual filling level (23); the measuring device is in form of a chamber with an electronic sample recognition system.

EFFECT: cheap and reliable filling of vessels of any height.

7 cl, 2 dwg

FIELD: machine building.

SUBSTANCE: device includes two level liquid sensors, three programming outputs of its functional capabilities and four outputs. When the first and the second programming outputs are closed and the third programming output is connected to the third output of the device, it is transformed to a liquid level monitoring and control system with its wavy surface using the first and the second outputs of the device, which provides a mode of liquid level monitoring and supporting at fixed height. When the first and the second programming outputs are open and the third programming output is connected to the third output of the device, it is transformed to the liquid monitoring and control system with its smooth surface in the mode of liquid level monitoring and supporting at its fixed height using the first and the second outputs of the device. When the programming outputs are disconnected, the device is transformed to an upper liquid level control annunciator using the third output of the device or a lower liquid level control annunciator using the fourth output of the device. The invention provides control of loads in the form of an electromagnetic relay or two windings of an electromagnetic starter, as well as in the form of inputs of logic elements of digital microcircuits.

EFFECT: enlarging functional capabilities of the device by increasing the number of controlled liquids and providing the operating mode of the device with wavy surface of controlled liquid.

7 cl, 17 dwg

FIELD: machine building.

SUBSTANCE: method for adjusting a valve set in a steam line fitted by a water injection device involves stages when actual m˙W,IST, specified m˙W,SOLL quantity of water and the maximum shortage of water quantity FBmax are defined, the remaining time tRest,0 is calculated according to the equation: and the valve is closed if tRest,0 is less than the specified value Δt characterising the timing interval during which the shortage of spraying water is determined.

EFFECT: ensuring the valve adjustment method to provide for emergency closing of a bypass station in such a way as to prevent early closing of the valve.

8 cl, 4 dwg

FIELD: measuring equipment.

SUBSTANCE: invention can be used for production of water level in boiler drum control devices. Steam boiler contains water level control device contains medium level indicator in form of water indicating column 1 with level sight glass 2, which is rigidly connected to steam boiler 5 by means of pulse tubes 3 and 4. In water indicating column 1 upper part on bracket 17 housing 18 is installed, in which video camera 6 is arranged, wherein video camera 6 is displaced from direct observation zone. It does not prevent viewer from conducting of direct visual observation of water level by level sight glass 2. Water indicating column 1 is equipped with frame 19 with marks 20. Output from video cameras 6 is connected to signal converter 7 input. In the signal converter 7 output from image area selection unit 8 from level sight glass is connected to marks 20 recognition unit 9 input, which output is connected to measurements scale generation and perspective images minimizing unit 10 input, which output is connected to input of two media interface detector unit 11, which output is connected to input of media interface position values computer unit 12, which output is connected to interface unit 13 input. Signal converter 7 output signal through series-connected control unit 14 and control signal amplification unit 15 is supplied to electrified gate 16, installed on pipeline 21 to feed water into steam boiler 5. Mark 20 are made in form of graphic images, preferable in form of rectangles.

EFFECT: technical result is increase of water level control in boiler accuracy with its visual and instrumentation control.

6 cl, 3 dwg

FIELD: power industry.

SUBSTANCE: automatic water level control system in the HEPP water reservoir, containing water level sensors and a control object, connected to a computing device including a mathematical model, while a gate equipped with electric drive and a position sensor is selected as the control object, and the mathematical model of the computing device contains an algorithm, calculating the rms value of the water level change rate in the water reservoir.

EFFECT: creation of a system for automatic regulation of water level in the HEPP water reservoir, which has a quick response to change of monitored parameters with the purpose of swift decision-making on the monitoring results.

2 dwg

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