SU802666A1 - Apparatus for diagnosis of pump units - Google Patents

Description

The invention relates to the field of technical diagnostics and can be used for on-sizing diagnostics of pumping units. A device for diagnosing pumping units is known, comprising a driver and pressure sensors connected in series, a measuring unit, a calculating device with a reference unit and a printing unit 1. A disadvantage of the known device is the low accuracy of diagnosing and predicting the state of pumping units. The purpose of the invention is to improve the accuracy of diagnosing and predicting the state of pumping units. The goal is achieved by the fact that the device is equipped with integrators and a diagnostic parameter generating unit, for example, by specific power consumption per drive, connected by inputs to pressure sensors, and through integrators to additional installed flow sensors and power consumption of the unit, and output to the unit input measurements. The invention is illustrated in the drawing of a diagram of a device for diagnosing pumping units. It contains a diagnosed object consisting of an electric motor 1 and a pump 2 connected to a flow sensor 3, a suction pressure sensor 4 and a discharge pressure sensor 5, a power sensor 6 connected to an electric motor 1 and an integrator 7, an integrator 8 connected to the sensor 3 flow rates, a diagnostics parameter generation unit 9 connected by inputs to a suction pressure sensor 4, a discharge pressure sensor 5, integrators 7 and 8, and a measurement unit 10, a calculator 11, connected to the measurement unit 10, a block com 12 storing reference information, a printing unit 13, a setting unit consisting of setting units 14 for selecting the number of the pump unit and 15 setting the time worked by the pump unit. The device operates as follows. Sensors 6 and 3 of the power, flow rate and sensors 4 and 5 of the suction and discharge pressure sensors are connected to the pumping unit being diagnosed, consisting of the electric motor 1 and the pump 2.

The signals of sensors 3 and 6 through the integrators and sensors 4 and 5 of the pressure on the suction and discharge flow to the diagnostics parameter generating unit 9. The diagnostics parameter generating unit 9 averages the value of the signals of the sensors 4 and 5 of the suction and discharge pressures, determines the pressure differential on the pump 2 and generates a complex diagnostics signal, for example, by the specific power consumption, which is equal to

BUT.

E

(one)

 Q LR

where E is the power consumption;

Q - fluid flow; p - pressure drop;

DR RM - P p „- discharge pressure;

, pg - suction pressure. Next, the signal through the measurement unit 10 enters the counting unit device 11. If at this time the unit number is selected by setting unit 14 and the total time spent by this pump unit is set by setting unit 15, the calculating device 11 turns to reference information storage unit 12, receives the necessary data and to the solution of the problem of determining the residual pecyfis of a pumping unit, for example, using the following formula

, GM - 1 osT4 LU - A -1

where is the exponent of the function of changing the diagnostic parameter over time; Sf - actual time in hours

cumulative, retracted pumping unit, D - the initial value of the diagnostic parameter;

AP - limiting value of the diagnostic parameter; A. - the current value of the parameter

diagnosing.

After the computations are made, the residual resource information is transferred to the printing unit 13, where it is printed in the form convenient for further use.

The invention will improve the accuracy and reduce the laboriousness of the diagnostic process by eliminating manual labor in calculating the residual resource, moreover, the proposed device allows increasing the efficiency of using pumping units by predicting the state and timely maintenance and repair.

Claims (1)

1. USSR author's certificate No. 511440, cl. F 15 B 19/00, 1975.