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 [1] . 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 [1]. 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 [3]; 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 [6], 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 [4]:

< / 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.

 

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