SU1416756A1 - Method of starting pump unit - Google Patents

Abstract

Invention m. used in reclamation pumping stations. The purpose of the invention is to improve the reliability of the launch of the unit by preventing cavitation phenomena. A device that implements this method contains sensors 1-6, respectively, the downstream level, the turning angle of the pump blades, the supply voltage, the pressure under the impeller, the pressure in the discharge pipeline (TP) and the upstream level, functional functional models 7 1I, respectively, of the supply TP, pump, drive motor, pressure TP and siphon water flow, setting devices 12-16, respectively, the lower pool level, the level of the upper pool, pressure in the inlet and pressure TP, the permissible drop a tire pump station, a computing unit 17, the control valve unit 18 and a timer srsha vacuum pump 19. Include, open vent valve and siphon operating mode the measured parameters determined current value cavitation sealed sa. According to the received value, the degree of opening of the siphon air release valve is controlled. 1 il. i O)

Description

The invention relates to the field of pump control and can be used in reclamation pumping stations. $

The purpose of the invention is to increase the reliability of the launch by preventing cavitation phenomena.

The drawing shows a schematic diagram of a device that implements; o a method of starting a pump unit with a siphon outlet.

The device contains sensors 1-6, respectively, of the downstream level, the angle of rotation of the pump blades, the voltage of the supply network, pressure, under the impeller, pressure in the pressure pipe and the level of the upstream, reference functional models 7-11 respectively supplying pipeline, pump, electric motor, pressure pipe and siphon water outlet, adjusters 12-16, respectively, the downstream level, the level of the upper 25 downstream, pressure 'in the supply and pressure pipelines) permissible. voltage drops on the tires of the pumping station. a computing unit 17, a control device 18 of the valve 30 stall vacuum and the timer 19.

The device operates as follows.

When you press the Start button on the control panel, the 17 gg computing unit generates a signal allowing polling of sensors 1-3 th 6, respectively, of the downstream level, the angle of rotation of the blades, the level of the upstream, voltage of the supply network. The signals of these sensors are compared with the settings of the controllers 12, 13 and 16, which form a signal allowing the start-up of the pump unit, if the parameters are within acceptable limits. 45 If any parameter is outside the permissible limits, the computing unit 17 determines the sign of emergency blocking, blocks the motor control device 18 and displays a message to the operator. By the enable signal, the computing unit 17 transmits a signal to connect the pump motor to the mains. As the rotor accelerates, block 17 generates signals that allow polling of sensors 1-3,5 and 6 at certain points in time, which are generated by timer 19. After comparison, in setters 12, 13 and 15, the signals are fed to the inputs of the corresponding reference models 7-11. The voltage drop across the tires of the pumping unit is determined by the reference model 9 of the electric motor, the torque is determined by the reference models 7,8,10 and 11, respectively, of the supply path, pump, pressure pipe and siphon outlet, the resistance of the pumping unit, the filling rate of the pipeline, the amount of excess pressure in the pipeline. These parameters are fed to the input of the computing unit 17, in which the current values of the settings of the adjusters 12-15 and the vacuum value under the impeller of the pump are determined. After the next signal of the timer 19, after a short period of time, the whole process is repeated. This happens until the pressure in the pressure pipe reaches the water pressure in the upstream. In this case, the block 17 generates a signal allowing the device 18 to open the valve for the separation of the vacuum. When the engine reaches the rated speed, the block 17 generates a signal to the device 18, which closes the valve for stalling the vacuum.

Claims (1)

Claim A method of starting a pump unit with a siphon water outlet, which consists in turning on the pump, opening the air exhaust valve from the siphon and measuring the parameters of the operating mode, characterized in that, in order to increase the reliability of the start by preventing cavitation phenomena, the current value of the cavitation reserve is determined from the measured parameters and the obtained value is controlled by the degree of opening of the air exhaust valve from the siphon. VNIIIPI 'Order 4051/35 Circulation 574 Subscription Custom polygr. ave, city of Uzhhorod, st. Project, 4