RU2240446C1 - Pumping unit automatic control device - Google Patents

Abstract

FIELD: mechanical engineering; pumping units automatic control and monitoring systems.

SUBSTANCE: proposed device has pump drive starting and stopping members, drive control device, pressure indicator and maximum and minimum pressure relays connected to control device and pressure indicator. Pressure indicator is made in form of first storage element provided with signaling device and connected by recording input to maximum pressure relay and first OR gate to inputs of which command starting member and maximum pressure relay are connected in parallel. Pressure indicator is furnished with second storage element whose output is connected to reset input of first storage element and second OR gate whose output is connected to recording input of storage element. Reset input of second storage element is connected to output of first of first OR gate. Minimum pressure transmitter and outputs of additional AND gates in number corresponding to number of consumers are connected in parallel to inputs of second OR gate. Signal of operation of particular consumer and signal from minimum pressure relay of said consumer are applied across inputs of each additional AND gate in parallel. Outputs of additional AND gates corresponding to number of consumers are connected in drive control device to inputs of OR gate connected by output to storage element for putting pump drive in operation are connected in parallel with output of AND gate connected by its input with minimum pressure relay. Output of "automatic control" position of pump mode selector switch, signal on operation of particular consumer and signal from minimum pressure relay of said consumer are applied across inputs of each additional AND gate corresponding to number of consumers. Device is furnished additionally with warning unit containing two signaling channels in first channel of which signal from minimum pressure relay and signal on putting pump drive in operation are applied in parallel, is connected by output to first signaling device through first time delay element. Seconds signaling device in second channel is connected through second time delay element to signal on putting pump drive in operation. Invention is aimed at improving reliability and enlarging operation capabilities of device by provision of automatic control of device at connection of several consumers at different levels of minimum working pressure to pumping station.

EFFECT: enlarged operating capabilities, improved reliability in operation.

2 cl, 1 dwg

Description

The device relates to systems for automatic control and monitoring of the operation of pumping units, including those providing the supply of working fluid for several consumers simultaneously with different pressure values of the working fluid.

Known automatic pumping station (US patent No. 4065228, CL 417-212, published 1977), having a control system and remote control for pressure, flow and temperature of the liquid with control units for electric pumps and sensitive elements with electrical inputs.

A disadvantage of the known device is its complexity.

A device is known for automatic monitoring and control of a pumping unit (AS USSR No. 735825, class F 04 D 13/06, 1977), containing start and stop devices for a pump drive, a drive control device, an upper and lower pressure switch connected to the control device of the actuator and pressure indicator.

A disadvantage of the known device is the difficulty of remote control and low reliability.

There is also known a device for automatic monitoring and control of a pumping unit (AS USSR No. 1108243, class F 04 D 15/00, 1978), selected as a prototype, containing start and stop parts for the pump drive, drive control device, relay upper and lower pressure levels connected to the actuator control device and pressure indicator, while the pressure indicator is made in the form of a memory device equipped with a signaling device with recording and reset inputs, the recording input of which is connected to the upper pressure level switch, and the reset input and is equipped with a gate or by contacting the starting command authorities, and is connected to the relay of the lower pressure level.

A disadvantage of the known device is the low reliability for the following reasons:

- in the remote control mode of the installation, it is not possible to turn on an alarm about increasing pressure, since the signal from the command element of the remote start of the pump drive through the AND element of the drive control device and the OR element is constantly fed to the reset input of the memory element, which includes the signaling device from the upper pressure level switch, and the inclusion of the signaling device from the relay of the upper working pressure level is thereby blocked;

- the device does not provide an alarm for the lower level of working pressure when the pump is turned on, if this pressure does not increase within a specified time;

- the device does not provide an alarm about the operation of the pump for more than a specified time of continuous operation, required to ensure all consumers receiving the working fluid from the pumping unit;

- the device does not provide for the automatic operation of the pumping unit, which provides the working fluid to several consumers with different values of the minimum working pressure.

The purpose of the invention is to increase the reliability and expand the functionality of the device by ensuring the automatic operation of the device when several consumers are connected to the pump station with different levels of minimum working pressure, providing a reliable pressure signal in the system with remote control of the pump drive and providing an alarm in case of malfunctions in the pump or work of consumers of the working fluid connected to the pump.

For this, the device contains start and stop bodies for the pump drive, a drive control device, a pressure indicator and pressure switches for the upper and lower pressure levels connected to the control device and the pressure indicator, and the pressure indicator is made in the form of a first memory element equipped with a signaling device, the recording input of which is connected to the upper pressure level switch, and the first OR element, to the inputs of which the start command element and the upper pressure level relay are connected in parallel. The pressure indicator is additionally equipped with a second memory element, the output of which is connected to the reset input of the first memory element, and a second OR element, whose output is connected to the recording input of the second memory element, the reset input of the second memory element is connected to the output of the first OR element, and to the inputs of the second element OR a parallel sensor of the lower pressure level and outputs of additional elements are connected in parallel And by the number of consumers of the pump installation, and a signal about Handling specific consumer and the signal from relay the lower pressure level of the consumer. In the control device of the drive to the inputs of the OR element, connected with its output to the memory element to turn on the pump drive, are connected in parallel with the output of the element And connected to its input with a low pressure switch, also the outputs of the additional elements And the number of consumers of the pump installation, to the inputs of each of which are connected in parallel with the output of the "automatic control" position of the pump operating mode switch, a signal on the operation of a specific consumer and a signal from a low pressure switch th consumer.

The device is additionally equipped with an alarm block containing two alarm channels, while in the first channel the input element And, the inputs of which are connected in parallel with the signal from the low pressure switch and the signal that the pump drive is turned on, is connected with its output to the first signaling device through the first element time delay, and in the second channel, the second signaling device is connected through the second time delay element to the signal on the inclusion of the pump drive in operation. In the alarm block, the AND element can be connected via the OR element to the low pressure switch of all consumers of the pump unit.

The drawing shows a functional diagram of the device.

The device contains bodies 1 and 2 for starting and stopping the drive of the pump 3 (channel 3.1 signals the operation of the pump), control device 4 of the drive, relay 5 of the upper pressure level connected by channel 5.1 to the control device 4 and the indicator of the upper pressure level 6, and relay 7 of the lower pressure level connected by channel 7.1 to the alarm unit 8.

At the pump outlet, a hydraulic accumulator (pneumatic tank) 9 is connected in the hydraulic channel, the pressure in the pneumatic chamber of which is not less than the setting of the relay 7.

In the hydraulic channel, through the controlled valves 10, 11 and 12, the bypass hydraulic supply channels are connected to consumers 13, 14 and 15, respectively.

The power of the consumer 13 is turned on through the control channel 13.1 of the valve 10. In the power supply channel of the consumer 13 behind the valve 10, a relay 13.2 of the lower pressure of the power supply of the consumer 13 is turned on with a setting higher than the setting of the relay 7. The signal from the relay 13.2 is transmitted through channel 13.3.

The power of the consumer 14 is turned on through the control channel 14.1 of the valve 11. In the power channel of the consumer 14 after the valve 11, a relay 14.2 of the lower pressure of the power of the consumer 14 with a setting higher than that of the relay 13.2 is turned on. The signal from relay 14.2 is fed through channel 14.3.

The power of the consumer 15 is turned on through the control channel 15.1 of the valve 12. In the power supply channel of the consumer 15 behind the valve 12, a relay 15.2 of the lower pressure of the consumer power 15 is turned on with a setting higher than that of the relay 14.2. The signal from relay 15.2 is fed through channel 15.3.

The control device 4 provides a switch 16 operating modes of the actuator 3 with two positions - automatic control (AU) 17 and remote control (DU) 18.

The output of position 17 is connected to the inputs AND 19 and AND 20. The output AND 19 is connected through OR 21 to the recording input of the memory element 22, which includes the drive 3. Channel 7.1 is connected to another input And 19.

The outputs of AND 23, AND 24 and AND 25 are also connected to other inputs of OR 21.

To the inputs And 23 connected output 17, channel 15.1 and channel 15.3.

To the inputs And 24 connected output 17, channel 14.1 and channel 14.3.

To the inputs And 25 connected output 17, channel 13.1 and channel 13.3.

Channel 5.1 is connected to the other input of AND 20, and the output of AND 20 through OR 26 is connected to the reset input of memory element 22.

The output 18 of the remote control switch 16 is connected in parallel with the command body 1 to the inputs And 27 and in parallel with the command body 2 to the inputs And 28.

In indicator 6 of the upper pressure level, channel 5.1 is connected to the recording input of the first memory element 29, the output of which is connected to the signaling device 30.

Channel 7.1 through the second element OR 31 is connected to the recording input of the second memory element 32, the output of which is connected to the reset input of the memory element 29.

In parallel with the output AND 27 channel 5.1 through the first element OR 33 is connected to the reset input of the memory element 32.

To the inputs of OR 31 in parallel with channel 7.1 are connected:

- And output 34, to the inputs of which channels 13.1 and 13.3 are connected;

- And 35 output, to the inputs of which channels 14.1 and 14.3 are connected;

- And output 36, to the inputs of which channels 15.1 and 15.3 are connected.

In block 8 of the alarm signal in the first signaling channel, channel 3.1 is connected in parallel with channel 7.1 (via OR 31) to the inputs AND 37, the output of which is connected through the time delay element 38 to the signaling device 39.

In the second signaling channel of block 8, channel 3.1 is connected through a time delay element 40 to a signaling device 41.

At the output of the time delay element 38, a channel 38.1 is provided for issuing a signal to block the operation of responsible consumers in the event of a pump station malfunction.

In the event of a malfunction in the automatic control of the pump drive 3, the device provides an option for remote control of the drive.

For this, the output of switch 16 in position 18 of the remote control is connected in parallel with the command element 1 through AND 27 and OR 21 to the recording input of the memory element 22, including the drive 3 of the pump, and in parallel with the command authority 2 through AND 28 and OR 26 to the reset input of the element memory 22 to stop the pump.

The signal from the output And 27 is supplied through OR 33 to the reset input of the memory element 32.

The device operates as follows.

Commissioning of the device for automatic operation is carried out by setting the switch 16 operating modes in position 17 (AU).

Output 17 goes to input AND 19 of turning on the pump drive and to input AND 20 of turning off the pump drive.

With the closed control valves supplying consumers 10, 11 and 12 and the pressure drop in the hydraulic channel behind the pump until the relay 7 of the lower pressure level is activated, the signal from the output of the relay 7 via channel 7.1 is fed to the second input And 19, and from the output And 19 through OR 21, the signal arrives at the recording input of the memory element 22, which includes the drive 3 of the pump in operation.

The pump begins to pump the working fluid into the hydraulic accumulator (pneumatic tank) 9, increasing the pressure in the hydraulic channel behind the pump. When this pressure rises above the response level of the relay 7 of the lower pressure level, the signal on channel 7.1 is removed from the input And 19 and the recording input of the memory element 22.

After the pressure in the hydraulic channel behind the pump is reached until the upper pressure level switch 5 is activated, the signal from the relay 5 through channel 5.1 is fed to the second input AND 20 and from its output through OR 26 to the reset input of the memory element 22. The pump drive 3 stops.

At the same time, the signal through channel 5.1 enters the pressure indicator 6, to the recording input of the memory element 29, which includes the signaling device 30. The signaling device 30 remains activated until the pressure in the hydraulic channel behind the pump drops below the response level of the low pressure switch 7.

In this case, a signal from relay 7 is transmitted through channel 7.1, as described above, to turn on the pump drive and, via OR 31, to the recording input of memory element 32, the output of which is fed to the reset input of memory element 29. Signaling device 30 is turned off.

As described above, when the upper pressure level switch 5 is activated, the signal through channel 5.1 is sent to stop the pump drive 3, to turn on the alarm 30 and through OR 33 to the reset input of memory element 32, the signal from the output of which previously switched off the alarm 30.

Further, the device operates in automatic mode.

After turning on the drive 3 by the signal from relay 7 on channel 7.1, the signal on turning on the drive on channel 3.1 simultaneously with the signal on channel 7.1 is input to And 37 in alarm block 8, and the signal from output And 37 is fed to the input of delay element 38 time to turn on the alarm.

The time delay for activating the alarm is determined by the amount of time necessary for the pressure in the common pipeline to rise above the set point for the low pressure switch during normal pump operation.

If during the time determined by the setting of the element 38, the signal on channel 7.1 is not removed, the output of the element 38, the signal goes to the signaling device 39.

The pump may have a time limit for continuous operation.

For example, a pump may maintain a pressure in the line above the response level of the low pressure switch 7, but the flow rate for consumers may be too large or there may be a leak in the pipeline preventing the pressure in the pipe from rising before the high pressure switch 5 is activated. In any case, the continuous operation of the pump for more than a certain time indicates the abnormal operation of the pump installation or its consumers.

To signal this, in block 8 of the alarm system, a signal about the operation of the pump drive 3 via channel 3.1 is fed to the input of the time delay element 40, which determines the maximum allowed time for continuous operation of the pump. From the output of the element 40, the signal enters the signaling device 41.

Any number of consumers with different levels of lower pressure for each can receive working fluid from the pump, the hydraulic channels of which are separated from the pump by controlled shut-off valves. The diagram shows three control channels 13, 14 and 15, separated by valves 10, 11 and 12, respectively.

Valves 10, 11 and 12 are opened by exposure to control channels 13.1, 14.1 and 15.1, respectively.

Depending on the requirements for the minimum working pressure required for a particular consumer, channels 13, 14 and 15 are equipped with low pressure switches in each channel 13.2, 14.2 and 15.2, respectively, with output alarm channels 13.3, 14.3 and 15.3.

The signals on channels 13.3, 14.3 and 15.3 ensure that the pump is switched on at a higher pressure than the signal from the sensor 7 on channel 7.1.

Channels 13, 14 and 15 can be connected during their operation to the common hydraulic channel behind the pump alternately or simultaneously.

Assume that the minimum working pressure in channel 15 is higher than in channel 14, and in channel 14 is higher than in channel 13.

When the hydraulic channel 13 is connected to the pump through a controlled valve 10 from the control channel 13.1, the signal from the lower pressure switch 13.2 in channel 13 is supplied via channel 13.3 in parallel with channel 13.1 to inputs And 25, at the third input of which there is a signal from the output 17 of the AU switch 16.

From the output AND 25, the signal through OR 21 is fed to the recording input of the memory element 22, including the operation of the pump drive 3 before the pressure in the hydraulic channel decreases to the setpoint of relay 7. The pump stops from relay 5, as described previously.

Similarly, the system works when connecting the hydraulic channels 14 and 15 simultaneously with the channel 13 or separately.

Accordingly, when channel 13 is connected to the pump, the signaling device 30 is switched off by signals from channels 13.1 and 13.3 (signal 13.1 - channel 13 is working, signal 13.3 is the lower pressure level in channel 13) through AND 34, OR 31 and memory element 32 (a signal is sent to a reset input of a memory element 29 supporting the indicator 30).

Similarly, the signaling device 30 is turned on and off when channels 14 and 15 are connected simultaneously with channel 13 or separately.

Since the response level of the pressure switch 13.2, 14.2 and 15.2 is higher than the response level of the relay 7, during operation of any of the channels 13, 14 or 15, the drive 3 of the pump is switched on from And 25, And 24 or And 23, respectively.

If the operation of any consumer (or several consumers in different control channels) is critical to the lower pressure level in the corresponding channel, the operation of these consumers can be blocked by a signal 38.1 appearing at the output of the time delay relay 38 in the alarm block, until the pressure in this channel above the response level of the corresponding pressure switch.

Accordingly, through And 37 to the input of the time delay relay 38 can be connected outputs And 34, And 35 And 36.

In case of a malfunction of the automatic control circuit of the pumping unit, the pump drive 3 can be switched on and off remotely.

To do this, the switch 16 is set to position 18 (remote control); the switch output in this position is connected to the inputs of And 27 and And 28, preparing them for work.

When you turn on the command authority 1, the signal from the output And 27 through OR 21 is fed to the recording input of the memory element 22, and from its output to the pump drive 3, including the drive in operation.

When you turn on the command authority 2, the signal from the output And 28 through OR 26 is fed to the input reset of the memory element 22, removing from the output of the element 22 the signal to turn on the drive 3 of the pump.

From the output AND 27, the signal through OR 33 also goes to the reset input of the memory element 32, thereby preparing the memory element 29 for operation.

When the pressure behind the pump rises to the level of relay 5 operation, the signal is transmitted via channel 5.1 to the recording input of the memory element 29, which includes the signaling device 30. The drive stops by turning on the organ 2.

Claims (2)

1. A device for automatic monitoring and control of a pump installation, containing start and stop devices for a pump drive, a drive control device, a pressure indicator and a pressure switch for upper and lower pressure levels connected to a control device and a pressure indicator, wherein the pressure indicator is designed as an indicator the first memory element, the recording input of which is connected to the upper pressure level switch, and the first OR element, the inputs of which are connected in parallel to the start command element and relays the upper pressure level, characterized in that the pressure indicator is additionally equipped with a second memory element, the output of which is connected to the reset input of the first memory element, and a second OR element, whose output is connected to the recording input of the second memory element, the reset input of the second memory element is connected to the output of the first OR element, and to the inputs of the second OR element are connected in parallel a sensor of the lower pressure level and outputs of additional elements AND according to the number of consumers of the pump installation, and to the inputs of each additional of the And element, a signal on the operation of a specific consumer and a signal from the lower pressure switch of this consumer are connected in parallel; in the control device of the drive, to the inputs of the OR element, connected by its output to the memory element to turn on the pump drive, are connected in parallel with the output of the And element, connected by its input to the low pressure level switch, also the outputs of additional elements And according to the number of consumers of the pump installation, the inputs of each of which are connected in parallel with the output of the "automatic control" position of the pump operating mode switch, a signal on the operation of a specific consumer and a signal from the lower pressure switch that consumer; the device is additionally equipped with an alarm block containing two alarm channels, while in the first channel the input element And, the inputs of which are connected in parallel with the signal from the low pressure switch and the signal that the pump drive is turned on, is connected with its output to the first signaling device through the first element time delay, and in the second channel, the second signaling device is connected through the second time delay element to the signal that the pump drive is in operation. 2. The device according to claim 1, characterized in that in the alarm block to the input element And can be connected in parallel through the element OR of a low pressure switch for all consumers of the pump unit.