SU1581862A1 - Arrangement for controlling a group of pumps - Google Patents

Abstract

The invention allows to expand the functionality by providing operation with the required combination of pump control modes with an arbitrary number of them. The control unit of a group of pumps contains units 2-5 of control (CU) and actuators of pumps with power supply circuits in switching unit (B) 1. These circuits include the contacts of the technological parameter sensor 6, remote control switches 8–11, switch (P) 7 for selecting a combination of pump operation modes and alarm relays 19–22. The control circuits of the latter contain the contacts of the reset buttons 24 and the intermediate relays 18, and the power supply circuits of the latter are connected in parallel with the contacts of the pressure relay 16 behind the pumps and the time relay 17. Pre-pressing the appropriate button P 7 set the desired combination of modes of operation of the pumps. In this case, part of the pumps operates in automatic mode, part in the remote, part is in reserve. When the technological parameter deviates from the setpoint, sensor 6 is activated and, through P 7 and B 1, it sends a signal to the control unit 2, 3, 4 or 5 of the corresponding pump. Its output to the mode and operation is monitored by a pressure relay 16 and a time relay 17 and, in the event of a malfunction, the signal is transmitted through an intermediate relay 18 to a relay 19, 20, 21 or 22 of the corresponding pump. It uses its contacts in B 1 to switch to the start of a pump that is in reserve. If it is impossible to maintain the technological parameter by operating pumps, according to the signal of the 6 B 1 sensor, it turns off or off the pumps that are in the automatic mode of operation. Using switches 8, 9, 10 or 11, the operator can manually turn on or off pumps that are in remote control mode. The ability to distribute pumps into groups that differ in operating mode allows you to effectively plan load distribution and maintenance and repair work.

Description

The invention relates to pump construction and can be used in pumping station control systems containing groups of pumps. .

The purpose of the invention is to expand the functional capabilities by providing operation with the required combination of pump control modes with an arbitrary number of them.

Figure 1 shows a diagram of a control unit for a group of four pumps, a general view; FIG. 2 illustrates a circuit of a switching unit for a group of four pumps with four possible combinations of their operation modes; in Fig. 3, the block diagram is unfolded: pressure control over the pumps for this is the case; FIG. 4 shows a pump selection switch for this case; on

Fig. 5 illustrates a part of the unfolded circuit of the switching unit for a group of n pumps with m possible combinations of their operation modes; 6 is another part of this circuit of the switching unit; n FIG. 7 shows a pump selection switch for this case.

The control unit of the pump group contains the switching unit 1 with the power supply of the control units 2-5

with

d 5

0

five

pump actuators, process parameter sensor 6 (liquid level in reserve, pressure or flow), switch 7 for selecting a combination of automatic, backup or remote pump operation modes and remote control switches 8-11 with contacts in the power supply of control units 2-5, blocks 12–15 of pressure control behind the pumps, each of which includes a pressure relay 16 behind the pump and a time relay 17 with contacts connected in parallel in the power supply circuit of the intermediate relays 13. In addition, the device is equipped alarm relay 19-22 (according to the number of pumps), additional time relay 23 Each pressure control unit 12-15 behind the pump contains a reset button 24 for relay 19-22 alarm with self-return, winding and time relay contacts 23 are connected in parallel to the power supply circuit of the corresponding relay 19-22 accidents. The contacts of the latter are included in the power supply circuits of the 2-5 control blocks of the actuators of the pumps of the commutation block 1,

Combination selection switch 7

modes of operation may contain a button

The selection keys 25-28 and the reset button 29 and the switching unit 1 are the isolation diodes 30-69, the connection of which is shown in FIG. 2 or FIGS. 5 and 6. The blocks 12-15 include the contacts 70 of the blocks 2 -5 controls

The device works as follows.

becomes self-blocking via its contact 21-6 and the disconnecting contact of the reset button 29, the alarm relay 21 is triggered. Contact 21-5 breaks the circuit of the first input of control unit 4. The other contact 21-5, closing, sends a signal to the second input to turn off the faulty third to

In the initial position of the switch, Q coca. In block 1 4, contact 70 opens.

7, the selection of the combination of automatic, backup or remote operation modes is in the combination Reset, and the switches 8-11 remote

Block 4 of the third pump and alarm relay 21 are self-locking. In accordance with the selected combination, the backup should automatically turn on.

control - in the Off position, the fourth pump, which turns on

The device starts up via the contact 21-1 of the accident relay 21, by pressing one of the buttons 25 - 28 and 35, contact 25 - 2 of the selection button 25,

of choice. When pressed, for example, diode 47 and pin 22-5. At the same time

buttons 25 close all its contacts 25-1 ... 25-5 and through contact 25-5 and diode 63 it becomes possible to control the first pump with the remote control switch 8. If the value of the process parameter corresponds to the minimum value, the contact 6-1 of the sensor 6 is closed and the first input of the control unit 3, the signal to turn on the second pump through the contact 25-1, the diode 49 and the opening contact 20-5. At the same time, time relay 23 is triggered via diode 45. After the time delay has elapsed, contact 23-1 closes and contact 25-5, diode 48, break-contact 21-5, to the first input of unit 4, a third pump turn-on signal is given. When the technological parameter reaches its maximum value, the sensor 6 switches to contact 6-2, as a result of which time relay 23 de-energizes, its contact 23-1 returns to its initial position, and through contact 25-4 and diodes 56, 54 to the second inputs of blocks 3 and 4, the disconnect signals of the second and third pumps are given.

The inclusion of a reserve in case of an accident, for example, a pump NZ, is as follows. I

In block 14 of the control signal from the contact 70 of block 4 starts the time relay 17. At the same time, it arrives at the contact of the relay 16, the pressure behind the pump that remains open, the Intermediate relay 18 remains de-energized. After the time delay has elapsed, contact 17-1 closes and opens the contact 13-1, which

Block 4 of the third pump and alarm relay 21 are self-locking. In accordance with the selected combination, the reserve

0

five

0

From the second input of unit 5, the switch-off signal is removed by opening contact 21-3 of the emergency relay 21, which previously passed through the contact 25-5 of the selection button, diode 64 and contacts 21-3, 20-3 and 19-2.

After elimination of the malfunction in the third pump, it can be put into operation by pressing the alarm reset button 24 in block 14. In this case, the alarm relay 21 is removed from self-blocking and de-energized. Its pins 21-5 return to their original position by preparing unit 4 for operation.

Thus, when you press the button 25 of the selector switch 7, the first is

e soy is controlled remotely, the second and third pumps are automatically, the fourth is in reserve.

Pressing the selection button 26 closes the contacts 26-1 ... 26-5, and earlier

0 button 25 is pressed, it returns to its original position, all its contacts 25-1 .., 25-5 are opened and the pumps are controlled as follows: the second is remote, the third and fourth are automatically, the first is in reserve. The second pump is controlled via pin 26-5, diode 69, switch 9 and pins 20-5. The third pump is turned on via contact 6-1 of sensor 6 of the process variable, contact 26-1, diode 48, contact 21-5, and control unit 4. After the delay expires, the time relay 23, started through diode 44, closes its contact 23-1 and the signal through buttons 26-3, diode 47 and contact 22-5 is fed to the first input of control unit 5, which turns on the fourth pump. To the input of the control unit 2, a trip signal is given through the contact

five

0

26-5 buttons 26, diode 62, contacts 22-2, 21-2 and 20-2, and the first pump is transferred to the reserve. If any of the working pumps (second, third or fourth) fail, the backup first is put into operation. If a failure occurs with the second pump, then the alarm relay 20 triggers from the control unit 13, its contact 20-2 removes the trip signal from the second input of the control unit 2, and the first input receives the turn-on signal of the first pump via contacts 6-1 and 20 -1, diode 30, pin 26-2 of button 26, diode 46 and pin 19-5. If a malfunction occurred with the third pump, then the alarm relay 21 triggers from block 14, its contact 21-2 removes the signal, turning off from the second input of control block 2, and the first input receives the start signal of the first pump through contacts 6-1 and 21 -1, diode 31, pin 26-2 of button 26, diode 46 and pin 19-5. If a fault occurred with the fourth pump, then alarm block 20 triggers from block 15, its pin 22-2 removes the trip signal from control block 2, and the turn-on signal passes through pin 22-1 and diode 32.

Similarly, the pumps are controlled by pressing the button 27 or the button 28 of the switch 7 for selecting a combination of pump operation modes.

When the selection button 27 is pressed, the third pump is remotely controlled by block 4 via pin 27-5, diode 67 and switches 10, 11; automatically - the fourth pump by the block 5 through the contact 6-1 of the sensor 6, contact 27-1 and the diode 47, through the contact 6-2 of the sensor 6, contact 27-4 and the diode 53; the first pump is by the control unit 2 via diode 43, contact 23-1 of time relay 23, contact 27-3 of button 27 and diode 46, through contact 27-4 and diode 50; The second pump is turned off by the control unit 3 via contact 27-5, diode 68 and contacts 19-4, 22-4 and 21-4 and transferred to the reserve. If the third pump malfunctions, the alarm relay 21 from the control unit 14 is activated and the backup second pump is turned on via contact 21-1, diode 40, contact 27-2 of button 27 and diode 49. Simultaneously from control unit 3, the trip signal is released by opening contact 21- four. If the fourth pump fails, the alarm relay 22 from the control unit 1 5 is activated and the backup second pump is turned on via contact 22-1, diode 41, contact 27-2 and diode 49, and simultaneously the control signal 3 is deactivated by opening contact 22-4 In the event of a malfunction of the first pump, the alarm relay 19 from the control unit 12 is activated and the backup second pump is turned on via contact 19-1, diode 39, contact 27-2 and diode 49, and simultaneously with block 3 the trip signal is released by opening contact 19-4.

When the button 28 is pressed, the fourth pump is remotely controlled (by block 5), the first and second pumps are automatically (blocks 2 and 3), the third pump is transferred to the reserve (by block 4). The elements 28-5, 65, 1, 1.6-1, 28-1, 46, 42, 23, 23-1, 28-3, 49, 28-4, 51, 57 are used in the same way as described above. x one of the working pumps are used elements 6-1, 22-1, 38, 28-2, 48 19-1, 36, 20, 37, 28-5, 66, 22-3, 19-3, 20- 4, 21-5 for switching on the backup third pump by the control unit 4 for controlling the pump actuating mechanism.

Forced shutdown of all pumps is performed by pressing the reset button 29 of the selector switch 7 by applying signals to the second inputs of the control units 2-5 through diodes 58 ,, 61, respectively, while the determinant selection is pressed before, it returns to its original position, de-energizing the first inputs 1 of the units 2-5 controls.

With an increase in the number of pumps in the group, the number of buttons in the switch 7 of the pump control blocks, the remote control switches, the pump parameter control blocks, the alarm relay and the diverting diodes,

In this way, it is possible to put any of the pumps - on the remote control, the other two - on the automatic one and the fourth - to transfer to the reserve. This allows you to plan for pump resource development and maintenance and repair work. In the event of a malfunction of one of the working pumps, the reserve pump is automatically switched on. If necessary, the operator has the ability to remotely connect another pump to working.

Claims (1)

Invention Formula A group of pump control unit containing a switching unit with power supply circuits for control units of pump actuators, a process parameter sensor, a switch for selecting a combination of automatic, backup or remote pump operation modes and remote control switches with contacts in the power supply circuits for control units for pump actuators, blocks pressure control for pumps, each of which turns on a pressure switch for, a pump and a time relay with contacts on - ralelno intermediate circuit power switch, wherein. that, in order to expand functional capabilities by providing the required combination of pump control modes with an arbitrary number of them, the device is equipped with an alarm relay for the number of pumps, an additional time relay, each pressure control unit behind the pump contains a reset button for the alarm relay with self-reset, winding and the time relay contacts are connected in parallel to the power supply circuits of the pump control units of the pumps, the contacts of the intermediate relays and the contacts of the reset buttons of the alarm relay are switched on Allelic circuit power switch corresponding to accident, recent contacts included in the power control units actuators pump circuit switching unit. -HI -t g -I -t Pump selection Faye. four 25 26 28 29