SU1671969A1 - Device for automatic control of pumping unit - Google Patents

Abstract

The invention relates to the field of hydraulics and can be used in installations of the main hydrotransport, for example, coal-water suspensions. The aim of the invention is to reduce pressure pulsations by eliminating the coincidence of pump discharge phases. In the event that the signals of sensors 9, 10 arrive simultaneously at the inputs of element I 14, the latter generates a signal for changing the frequency to elements 15, 16, which, depending on the control signals of the trigger 17, issue a command signal to decrease or increase the frequency of rotation. engine 1 (2) of the pump 7 (8). In block 18, the difference between the command signals is integrated and the control signal is generated, which, through the thyristor controller 20, changes the frequency of rotation of one of the motors 1, 2.

Description

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The invention relates to hydraulics and can be used in installations of the main hydrotransport, for example, coal-water suspensions.

The aim of the invention is to reduce pressure pulsations by eliminating the coincidence of pump discharge phases.

Fig. 1 is a diagram of an automatic pumping control device; Fig. 2 shows the form of the pulse signals of the position sensors.

The device contains motors 1 and 2, connected by actuators in the form of rods 3 and 4 with pistons 5 and 6 of pump 7 and 8 of reciprocating movement, sensors 9 and 10 of position of rods 3 and 4, unit 11 of generating command signals in the form of elements 12 and 13 of the prohibition, elements 14, 15 and 16 of And and trigger 17, as well as the block 18 for controlling the misalignment of motors 1, 2 in phase in the form of serially connected by integrator 19 difference of command signals and thyristor controller 20. Herewith sensors 9 and 10 connected to the inputs of the first element 14 And elements 12 13 ban, whose outputs are connected to inputs of the flip-flop 17, each output of the latter is connected to the input of one of the other elements 15, 16, the other inputs of which are connected to the output of AND gate AND, and the outputs - to the inputs of integrator 19, difference command signals.

The device works as follows.

Sensors 9 and 10, when passing through pistons 5 and 6 of pump 7 and 8 (leftmost positions in the drawing), give pulse signals Xi and X2 (Fig. 2). Two parallel-running pumps 7 and 8 generally have different rotational frequencies. (02. Therefore, the mismatch time tp corresponding to a certain mismatch

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the movements of pistons 5 and 6, constantly changing, and at certain moments, when Xi and Xg signals are superimposed, a sharp increase in pressure pulsations occurs. A change in the rotational speed of one of the engines 1, 2 of pumps 7 and 8 will lead to an increase in the error and decrease in pressure unevenness. Therefore, if the signals of the sensors 9 and 10 are received simultaneously at the inputs of the element And 14, the latter generates a signal to change the frequency w. Then the signal goes to elements 15,16 And, which, depending on the control signals from trigger 17, give a command signal to reduce Uvili to increase YB + rotation frequency of engine 1 (2) of pump 7 (8). In block 18, the difference between the command signals YB + and YB is formed; the formation of the control signal Uynp, which enters the thyristor controller 20, which changes the frequency of rotation of the motor of one of the pumps 7, 8. Elements 12 and 13 form signals for triggering and disabling 17

Claims (1)

Invention Formula A device for automatic control of a pump installation, containing motors coupled to drive elements with pistons of reciprocating movement, as well as position sensors of drive elements connected through the engine control signal generating unit to the engine error control unit, reducing the pressure pulsations by eliminating the coincidence of the pump discharge phases, the command signal generation unit is made in the form of two prohibition elements, three And trigger elements, and the motor misalignment control unit in the form of serially connected integrator command signal differences and a thyristor controller, with each sensor position is connected to one input of the first element And and to one input of each of the prohibition elements, the outputs of which are connected to the trigger inputs, each output of the latter is connected to the input of one of other elements And, the remaining inputs of which are connected to the output of the first element And, and the outputs - with the inputs of the integrator difference command signals. fel 20 Ai) FIG. 2