SU1170435A1 - Device for controlling water level in water tower - Google Patents

Abstract

A DEVICE FOR REGULATING WATER LEVEL IN A WATER TOWER, containing a series-connected water tower level controller and a radio transmitter unit, a control unit and an actuator, the radio transmitter unit comprising a series-connected carrier frequency generator, modulator, filter and power amplifier, as well as a switch unit the coding blocks, the outputs to which are connected respectively to the second and third inputs of the modulator, the input of the switching unit is connected to the input of the radio transmitting unit, and The output of the power amplifier is connected to the output of the radio transmitting unit, characterized in that, in order to reduce the energy consumption and increase the accuracy of the device, the radio transmitting unit is inserted (L pulse width drivers, the inputs of which are connected to the corresponding outputs of the switching unit dying blocks.

Description

four

Od

The invention relates to the automatic control of water levels in a water supply system, in particular to radio remote control of the water level in water towers in rural areas. The aim of the invention is to reduce power consumption and increase the accuracy of the device. Figure 1 shows the part of the device located at the command post (KP, water tower); Fig. 2 shows a part of a device located at an executive station (PI, artesian well), the device includes a level 1 controller, including; lower 2 and upper-3 level sensors and a relay unit 4, and a radio transmitting unit 5, including a unit 6 switching, pulse shaper 7 and 7, coding blocks 8 and 8, modulator 9, filter 10, power amplifier 10, carrier frequency generator 12 and. the antenna 13, on the PI, the radio receiving unit 14, including the antenna 15, the high frequency amplifier 16, the filter 17, the synchronous detector 18 and the decoding blocks 19 and 19, the control unit 20, the actuator (pump) 21. The gearbox (water tower) 22 and the PI ( artesian well) 23 are interconnected by pipeline 24. The device works as follows. The water level in the water tower 22 below the specified value is caused by a change in the resistance of the low level sensor 2, and the DC unit 4 is triggered and the electric signal of the direct current occurs. Through the switching unit 6, the pulse shaper 7 is supplied to the pulse shaper 7, which provides the duration of the generated command signal specified in the 0.1-Zs interval, which is fed to the coding unit B, which converts an electric DC signal into an alternating current electric signal with a frequency f is modulated. The signal is then fed to a cascade from modulator 9, filter 10, power amplifier 11, and carrier frequency generator 12, which provides a single-wave modulation of the signal and generation of a command signal to be transmitted over the air. Signal transmission generates 52 seconds in the VHF band -band, the choice of which is due to the smaller workload of its radio transmissions, the low susceptibility of transmitting various kinds of interference and the possibility of directional transmission by a surface beam along a direct radio visibility line (up to 20-30 mm). 12 Carrier frequency generator It produces the carrier frequency f (which goes to the modulator 9, where the modulating signal f is fed before, from the coding block B. Here the formation of the two-band signal if, the carrier frequency is suppressed. The two-pole signal f with the suppressed carrier frequency goes to the selective filter 10, which suppresses the lower sideband and thus forms a high-frequency single-band signal that is fed further to the power amplifier 11 and the transmitting antenna 13. The received iNP antenna 15 of the receiving unit 14 a high frequency signal fj supplied to the high frequency amplifier 16 with the aim of amplifying the received low power command signal hereinafter - to a filter 17 and a synchronous ..detektor 1B, where the separation of the useful baseband signal with the frequency f. After decoding the signal in the decoding unit 19, which is tuned exactly at the frequency f, the signal arrives at the control unit 20, triggering it into the On position and thus activating the actuator 21, which starts pumping water into the tower through pipeline 24. When the water level reaches the sensor 3 the upper level changes the electrical resistance, the operation of the relay unit 4, and the DC signal goes through the switching unit 6 to the impulse generator 7, which provides continued itelnost signal transmission in the range of 0.1 to Sc encoding unit 8, where the DC signal is converted into an AC signal f. The operation of the modulator 9, the generator 12 of the carrier frequency, the filter 10 and the amplifier 11 of the power is similar to that described, and a single-pole-mode is produced. broadcast signal f j.f „+ f, broadcast and received on

311704354

The KP antenna 15 of the radio receiving unit generates a signal in the decoding 14. Here, a similar unit 19 to the signal with frequency f ,, occurs, the signal is transmitted to the controller through the cad control unit 20: power amplifier 16, filter off the actuator 17 and synchronous detector 18 and prema 21

(pz / e. /

Tg5

Claims (1)

A device for adjusting the water level in a water tower, comprising a series-connected water tower level controller and a radio transmitting unit, a control unit and an actuator, the radio transmitting unit including a series-connected carrier frequency generator, modulator, filter and power amplifier, as well as a switching unit and coding blocks , the outputs of which are connected respectively to the second and third inputs of the modulator, the input of the switching unit is connected to the input of the radio transmitting unit, and the output a power amplifier is connected to the output of the radio transmitting unit, characterized in that, in order to reduce energy consumption and improve the accuracy of the device, pulse shapers are introduced into the radio transmitting unit, the inputs of which are connected to the corresponding outputs of the switching unit, and the output to the inputs of the corresponding coding blocks . >