A device for controlling the water level in the tanks water towers
(57) Abstract:The invention relates to the field of automatic control systems. The technical result consists in increasing the reliability of control limiting upper and lower water levels in reservoirs water towers in difficult conditions related to the influence of capacitive transducers stray capacitance and extraneous electric fields when long connecting conductors, low negative ambient temperatures, waves and whirlpools, due to the falling water from the inlet pipe. The device comprises a bridge circuit with the current comparator and the screen hydraulic integrator, providing protection capacitive transducers of the claimed device from the influence of stray capacitance and external electric fields when long connecting conductors; hydraulic and electrical integrators, providing protection capacitive transducers and claimed device from the influence of waves and eddies due to the falling water from the inlet pipe; a screen hydraulic integrator is made with double walls and insulation, providing protection capacitive preobresti control or regulating non-electric variables using electric tools, and is intended to regulate the limit of the upper and lower water level in the tanks water towers.Known devices for measuring and controlling the filling level of the tank liquid, based on the use of mechanical and Electromechanical methods  . The disadvantage of these devices is that they cannot be used for water level control in tanks, water towers at low negative temperature when formed on the surface ice cover (cortex) of a thickness of a few millimeters.Known devices for measuring and controlling the filling level of the tank based on the ultrasonic method . Their disadvantage is the complexity of the device, as well as the impossibility of regulating the liquid level in the waves and eddies formed by the falling of the inlet pipe water, i.e. transients in the fluid.A device for water level control in tanks, water towers, containing:
1. Pressure gauge with contact system, custom upper and lower limit water level in the water tower and attached to the tank with water in its lower part. The pressure of the water column is passed through a tube pressure gauge, calibrated in units of ur is tradigital pump.The disadvantage of this device lies in the fact that at the time of supply of water from the inlet pipe of the column of falling water leads to changes in the pressure measuring transducer pressure gauge. When the gauge change, resulting in the contact of the upper and lower limit are closed and open, which leads to frequent switching on and off of the motor starting currents which bring the motor down.A device for water level control in tanks, water towers, containing a capacitive transducer water level into an electrical signal (sensor) with a variable dielectric constant, plates which are adjacent to the tube of dielectric material, communicating with the water tank ; pavement measuring circuit and out phase-sensitive amplifier [4, 5]; contact or contactless control element and the motor and pump.Advantages of capacitive transducers water level into an electrical signal: high sensitivity, relatively low weight and small dimensions, small Electromechanical force between the plates of the capacitive transducer.The disadvantage of this device penned the electric fields (especially when long connecting conductors); exposed to the negative impact of low outdoor temperatures, which can lead to electrostatic transducers from damage or distort their metrological characteristics due to the formation of a crust of ice on the surface of the water in the tank; influenced by waves and whirlpools on the surface of the water in the tank, resulting in a capacitance change of the capacitive transducers and to frequent on / off switching motor starting currents which bring the motor down.A device (prototype) for regulating the liquid level in the vessel , containing the upper and lower levels, are connected to respective inputs of the control unit, the first output of which is connected to the pump unit, the pulse generator and connected in series timer and actuator vertical movement associated with the sensor output of the upper level, and the output of the pulse generator is connected to the input of the timer, and the second output control unit connected with the second input drive vertical movement.The disadvantage of the prototype is the impossibility of its use in ambient temperatures close to zero degrees Celsius and neither is the input of a failure of the upper and lower levels.The problem to which the invention is directed, is to develop a technical solution that provides receive the following technical result is increased reliability of the claimed device in extreme conditions associated with impact: stray capacitance and extraneous electric fields when long connecting conductors; low negative ambient temperatures; waves and whirlpools, due to the falling water from the inlet pipe.This task is solved in that the device for controlling the water level in the tanks water towers containing converters upper and lower limit levels into an electrical signal, and the control unit lektrodvigatelem, through which the actuating element is connected to the motor with the water pump, equipped with hydraulic and electric integrators, hydraulic integrator is made in the form of a protective screen with trentaine connection covering converters upper and lower levels, which is capacitive, the upper and lower parts of the shield are partitions with holes, with protective screen beintegrated made in the form of resistive-capacitive chain capacitive transducers included in each bridge circuit with a current comparator, in which one of the conclusions of capacitive transducer connected to a source of alternating voltage of high frequency, a different conclusion to one of the shoulders of the current comparator, the reference capacitor is connected respectively to the specified power source and the second shoulder of the current comparator, and the midpoint of the shoulders of the current comparator is grounded and connected to the protective screen, the input electrical integrator through out phase-sensitive amplifier connected to the output winding of the current comparator, and to output an electrical integrator connected to the comparison circuit, connected to the control motor, this bridge circuit with a current comparator to regulate the upper and lower limits are made identical.In Fig. 1 shows a device for controlling the water level in the tanks water towers. The specified device comprises a capacitive transducer 1 upper limit level into an electrical signal; a capacitive Converter 2 lower limit level of the electric signal; a reference capacitors 3, 4; current comparator 5, consisting of shoulder (windings) 10, 11 and the output winding is th limit, consisting of a resistor 16 and a capacitor 17 and a similar integrator bottom level 18, 19; of the comparison circuit 20, 21: unit 22 controls the electric motor; Executive contact or contactless element 23; motor 24 in the kit with water pump.In Fig. 2 shows the structural diagram of the hydraulic integrator with capacitive transducers upper and lower limit level into an electrical signal. Hydraulic integrator contains capacitive transducers 1, 2, each of which consists of two metal plates covered with a layer of appropriate insulation (Fig. 2 is not shown); double protective screen in the form of a metallic walls 25, 26 and insulating material 27; partition 28 with the holes in the lower part of the protective screen (Fig. 2 shows one hole in each partition), partition 29 with holes in the upper part of the protective screen.Capacitive transducer 1, the reference capacitor 3, the current comparator 5, the power source of high frequency 13, out phase-sensitive amplifier 15 form a bridge circuit with a current comparator, in which the middle point of the shoulders 6 and 7 is grounded screens capacitive transducer 1 and the reference capacitor 3 sasam the tion for water level control in tanks, water towers consists in the following. Before describing the operation of the specified device consider the physical basis of his work.Capacitive level Converter into an electrical signal represents a flat capacitor, the capacity of which is expressed by the formula :
< / BR>where is the dielectric constant of the medium between the plates (plates) (for air0= 8,8510-12F/m; water =080);
S - the surface of the plates;
- the distance between the plates.Under the influence of water filling the space between the electrodes, the capacitance planar capacitor increases. This is because the dielectric constant of water is much greater than air.When regulating the upper limit of the water level in the water tower tank capacity of the Converter 1 increases. In case of equal capacitances of the Converter 1 and the reference capacitor 3 currents in the shoulders 6 and 7 of the current comparator 5 will be equal to the magnetic flux in the magnetic core of the current comparator 5 will be equal to zero, the voltage on the output winding will be zero DC voltage at the output out phase-sensitive amplifier is also zero. Zero potential affects the comparison circuit 20, which dvigatel 24 with the pump. The protection of capacitive transducer 1 from the influence of stray capacitance and extraneous electric fields is provided as follows. At the moment equilibrium of the bridge circuit, which corresponds to the above-described its condition, the potential of the plates of the transducer 1, is connected to the shoulder 6 of the current comparator 5, close to the ground potential. Therefore, leakage current from said plate of the Converter 1 and the connecting wires to the earth from the influence of stray capacitance is close to zero. The second plate of the Converter 1 is connected to a power source 13. Parasitic capacitance at this bypasses the power source and the measurement result is not affected by the Application of the specified bridge circuit, widely used in electrical technology, allows the most just spend the regulation of water levels using long shielded connecting wires.The water tower tank and hydraulic integrator are communicating vessels. While the presence of waves and eddies formed by the falling water from the pipeline, the hydraulic integrator is set to the average water level in the tank. This is achieved through the action of water in the hydraulic integrator at low ambient temperatures. Partitions 29 with holes provide air outlet when filling with water hydraulic integrator and protect from freezing water in the hydraulic integrator. Hydraulic integrator eliminates the influence of low frequency noise on the operation of the proposed device. The exclusion of high-frequency interference provides electrical integrator in the form of a resistor 16 and a capacitor 17. His work consists in the following. When filled with water of capacitive transducer 1 at the output out phase-sensitive amplifier 14, the voltage is changed from a value with a plus sign to zero and up to a voltage with a negative sign. In the output DC voltage out phase-sensitive amplifier may be pulsed high-frequency interference that could lead to the disabling or enabling of the motor. The capacitor 17 discharges slowly through the resistor 16, so electric integrator prevents the occurrence of impulse noise on the input of the comparison circuit 20. When the lowering of the water level in the water tower tank to the lower limit level, the capacity of the inverter 2 becomes equal to the capacity of the reference capacitor 4. This leads to the inclusion of the electric motor 24 and the water supply to the limit.Thus, the joint (aggregated) effect of hydraulic and electric integrators prevent the motor caused by the waves and the water in the water tower tank. Dual screen hydraulic integrator provides protection electrostatic transducers from the influence of external electric fields and stray capacitance when long connecting conductors, and the negative influence of environmental temperature.Literature
1. Measurements in industry: Issues, ed. 3 kN. KN. 2. Methods of measurement and instrumentation: Per. with it. / Under the editorship of Proposa P. - 2nd ed. M.: Metallurgy, 1990. C. 12-37.2. Great Soviet encyclopedia, second edition. Volume 44, S. 325-326. State scientific publishing house "Great Soviet encyclopedia", 1956.3. N. Amatuni and other Electrical equipment and electrical equipment. M: Rowwidth, 1963. S. 429-494.4. Turichin A. M. Electrical measurement of non-electrical quantities. M.-L.: Publishing house "Energy", 1966. C. 44-52.5. Arutyunov C. O. Electrical measuring instruments and measurements. M.-L.: State energy publishing house, 1958. S. 470-471.6. A. C. N1228082 (USSR). Device for regulirovki. in BI N16, 30.04.86. A device for controlling the water level in the tanks water towers containing converters upper and lower limit levels into an electrical signal, and the control motor, which via a control element connected to the motor with the water pump, characterized in that it is equipped with hydraulic and electric integrators, hydraulic integrator is made in the form of a protective screen with trentaine connection covering converters upper and lower levels, which is capacitive, the upper and lower parts of the shield are partitions with holes, with protective screen is made double, the space between the walls filled with insulating material, electrical integrator is made in the form of a resistive-capacitive chain, capacitive transducers included in each bridge circuit with a current comparator, in which one of the conclusions of capacitive transducer connected to a source of alternating voltage of high frequency, a different conclusion to one of the shoulders of the current comparator, the reference capacitor is connected respectively to the specified power source and vtorogo electrical integrator through out phase-sensitive amplifier connected to the output winding of the current comparator, and to the electrical output of the integrator is connected to the comparison circuit, connected to the control unit by an electric motor, while the bridge circuit with a current comparator to regulate the upper and lower limits are made identical.
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.
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.
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.
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.
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
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
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.