CN219159154U

CN219159154U - Water pump start-stop control system

Info

Publication number: CN219159154U
Application number: CN202223373164.8U
Authority: CN
Inventors: 彭丽媛; 郑烨; 郑国胜; 韩昌儒
Original assignee: Shenzhen Baoshui Water Conservancy Service Co ltd
Current assignee: Shenzhen Baoshui Water Conservancy Service Co ltd
Priority date: 2022-12-13
Filing date: 2022-12-13
Publication date: 2023-06-09
Anticipated expiration: 2032-12-13

Abstract

The utility model discloses a water pump start-stop control system, which comprises: the system comprises a radar liquid level gauge, a PLC controller and a soft start module; the PLC is respectively connected with the radar liquid level gauge and the soft starting module, and the soft starting module is connected with the target water pump; the radar liquid level gauge collects the current water level signal of the target water pump and transmits the current water level signal to the PLC; when the PLC monitors that the voltage value of the current water level signal reaches a first preset voltage value, a water pump driving signal is output to the soft starting module to conduct a power supply loop of the target water pump. According to the utility model, the accurate current water level of the water pump is acquired based on the radar liquid level gauge, and then the water pump driving signal is rapidly output to the soft starting module when the voltage of the water level signal of the water pump reaches the first preset voltage value through the PLC controller, so that the soft starting module rapidly conducts the power supply loop of the target water pump, and the start-stop control precision of the target water pump is improved.

Description

Water pump start-stop control system

Technical Field

The utility model relates to the field of liquid variable capacity type machinery, in particular to a water pump start-stop control system.

Background

At present, an operator needs to be arranged to manually operate and control the water pump, but due to the inconvenience of observing the water level by the operator, the water level observed by naked eyes is inaccurate and other objective factors, so that the problem of low operation precision exists in the existing water pump start-stop control process.

The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present utility model and is not intended to represent an admission that the foregoing is prior art.

Disclosure of Invention

The utility model mainly aims to provide a water pump start-stop control system, which aims to solve the technical problem of low operation precision in the existing water pump start-stop control process.

In order to achieve the above object, the present utility model provides a water pump start-stop control system, comprising: the system comprises a radar liquid level gauge, a PLC controller and a soft start module;

the PLC is respectively connected with the radar liquid level gauge and the soft start module, and the soft start module is connected with a target water pump;

the radar liquid level gauge is used for collecting a current water level signal of the target water pump and transmitting the current water level signal to the PLC;

the PLC is used for outputting a water pump driving signal to the soft starting module when the voltage value of the current water level signal reaches a first preset voltage value;

And the soft start module is used for conducting the power supply loop of the target water pump when the water pump driving signal is received.

Optionally, the water pump start-stop control system further comprises: a float switch;

the floating ball switch is connected with the PLC, and is arranged at a preset liquid level line of the water pump;

the floating ball switch is used for outputting a cut-off signal to the PLC when the water level of the target water pump reaches the preset liquid level line;

the PLC is further used for outputting a water pump stop signal to the soft start module when the cut-off signal is received;

the soft start module is further used for disconnecting the power supply loop of the target water pump when the water pump stop signal is received.

Optionally, the water pump start-stop control system further comprises: operating a relay;

wherein the operation relay is arranged between the PLC controller and the soft start module;

the PLC is also used for outputting the water pump driving signal or the water pump stopping signal to the operation relay;

the operation relay is used for conducting a control contact of the soft start module when receiving the water pump driving signal;

The soft start module is also used for conducting a power supply loop of the target water pump when the control contact is conducted;

the operation relay is also used for switching off the control contact of the soft start module when receiving the water pump stop signal;

and the soft start module is also used for switching off the power supply loop of the target water pump when the control contact is switched off.

Optionally, the operation relay includes: a first coil and a first contact;

the first end of the first coil is connected with the negative electrode of the switching power supply, and the second end of the first coil is connected with the operation output end of the PLC;

the first and second ends of the first contact are connected to the soft start module.

Optionally, the water pump start-stop control system further comprises: the operation indicator lamp, the input power supply and the first circuit breaker; the operating relay further includes: a second contact;

the first end of the second contact is connected with the live wire of the output end of the first circuit breaker, the live wire of the output end of the first circuit breaker is connected with the live wire of the input end of the switching power supply, the live wire of the input end of the first circuit breaker is connected with the live wire of the input power supply, the second end of the second contact is connected with the first end of the running indicator lamp, and the second end of the running indicator lamp is connected with the zero line of the input power supply.

Optionally, the water pump start-stop control system further comprises: a fault indicator light and a fault relay; the fault relay includes: a first fault coil and a fault contact;

the first end of the first fault coil is connected with the negative electrode of the switching power supply, and the second end of the first fault coil is connected with the fault output end of the PLC;

the first end of the fault contact is connected with the live wire of the output end of the first circuit breaker, the second end of the fault contact is connected with the first end of the fault indicator lamp, and the second end of the fault indicator lamp is connected with the zero wire of the input power supply.

Optionally, the soft start module includes: the soft starter, the power supply and the second circuit breaker;

the input end of the second circuit breaker is connected with the power supply, the output end of the second circuit breaker is connected with the wiring terminal of the soft starter, and the wire outlet end of the soft starter is connected with the target motor;

the soft stop input end and the starting input end of the soft starter are connected with the first end of the first contact, and the second end of the first contact is connected with the instantaneous stop input end and the common end of the soft starter;

The first fault output end and the second fault output end of the soft starter are connected with the soft start fault output end of the PLC.

Optionally, the water pump start-stop control system further comprises: a mode changeover switch;

the first end of the mode change-over switch is connected with the switching power supply, and the second end of the mode change-over switch is connected with the change-over input end of the PLC;

the mode change-over switch is used for acquiring a change-over signal input from the outside and transmitting the change-over signal to the PLC;

the PLC is also used for selecting a working mode corresponding to the conversion signal when the conversion signal is received.

Optionally, the water pump start-stop control system further comprises: a start button and a stop button;

the first end of the starting button is connected with the switching power supply, and the second end of the starting button is connected with the starting signal input end of the PLC; the first end of the stop button is connected with the switching power supply, and the second end of the stop button is connected with the stop signal input end of the PLC;

the starting button is used for sending the starting signal to the PLC when receiving the starting signal input from the outside;

The PLC is further used for outputting the water pump driving signal to the soft starting module when receiving the starting signal;

the stop button is used for sending the stop signal to the PLC when receiving the stop signal input from the outside;

and the PLC is also used for outputting the water pump stop signal to the soft start module when receiving the stop signal.

Optionally, the water pump start-stop control system further comprises a preset number of start buttons, stop buttons, an operation relay, an operation indicator lamp, a fault relay, a fault indicator lamp and a soft starter;

the first end of each starting button is connected with the switching power supply respectively, and the second end of each starting button is connected with the corresponding starting signal input end of the PLC;

the first end of each stop button is connected with the switch power supply respectively, and the second end of each stop button is connected with the corresponding stop signal input end of the PLC;

each operation relay is respectively connected with the corresponding operation indicator lamp, the operation output end of the PLC and the soft starter;

each fault relay is respectively connected with the corresponding fault indicator lamp, the fault output end of the PLC and the soft starter;

Each soft starter is respectively connected with the corresponding second circuit breaker, the soft start fault output end of the PLC controller and the target motor.

The utility model discloses a water pump start-stop control system, which comprises: the system comprises a radar liquid level gauge, a PLC controller and a soft start module; the PLC is respectively connected with the radar liquid level gauge and the soft starting module, and the soft starting module is connected with the target water pump; the radar liquid level gauge is used for collecting a current water level signal of the target water pump and transmitting the current water level signal to the PLC; the PLC is used for outputting a water pump driving signal to the soft starting module when the voltage value of the current water level signal reaches a first preset voltage value; and the soft start module is used for conducting a power supply loop of the target water pump when receiving the water pump driving signal. Different from the existing manual observation and lower-precision water pump control method, the method is based on the radar level gauge to collect the accurate current water level of the target water pump, and then the PLC is used for rapidly outputting a water pump driving signal to the soft starting module when the voltage value corresponding to the water level of the target water pump is monitored to reach the preset voltage, namely the water level of the target water pump reaches the preset water level, so that the soft starting module rapidly conducts a power supply loop of the target water pump. Therefore, the utility model constructs an accurate and effective water pump start-stop control system based on the radar liquid level meter, the PLC and the soft start module card, and improves the control precision of the target water pump.

Drawings

FIG. 1 is a functional block diagram of a first embodiment of a water pump start-stop control system according to an embodiment of the present utility model;

FIG. 2 is a functional block diagram of a second embodiment of a water pump start-stop control system according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a soft start module in a second embodiment of a water pump start-stop control system according to an embodiment of the present utility model;

FIG. 4 is a functional block diagram of a third embodiment of a water pump start-stop control system according to an embodiment of the present utility model;

fig. 5 is a schematic diagram illustrating connection of a PLC controller in a third embodiment of a water pump start-stop control system according to an embodiment of the present utility model.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				QF	Second circuit breaker	AC	Power supply
L1～L3	Second circuit breaker input	R、S、T	Terminal end
				U、V、W	Wire outlet end	M1	Target motor
5～6	First to second fault outputs	7	Instantaneous stop input end
				8	Soft stop input terminal	9	Start input terminal
10	Public terminal	M、2M、3M	Negative input terminal of power supply
				KA11	First contact	SA	Mode change-over switch
L+、3L+	Positive electrode input end of power supply	SB1	First start button
				DI.0	Conversion input terminal	SB2	First stop button
DI.1	A first start signal input terminal	SB3	Second start button
				DI.2	A first stop signal input terminal	SB4	Second stop button
DI.3	A second start signal input terminal	SB5	Float switch
				DI.4	A second stop signal input terminal	DI.7	Second soft start failure end
DI.5	Cut-off signal input terminal	R1	Resistor
				DI.6	First soft start fault end	KA1	First operation relay
AI.0	Liquid level input end	KA2	Second operation relay
				DQ.0	A first operation output end	KA3	First fault relay
DQ.1	A second operation output end	KA4	Second fault relay
				DQ.2	First fault output terminal	DQ.3	Second fault output terminal

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, all embodiments obtained by persons skilled in the art based on the embodiments in the present utility model without making creative efforts, belong to the protection scope of the present utility model.

It should be noted that the descriptions of "first," "second," etc. in the embodiments of the present utility model are for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Referring to fig. 1, fig. 1 is a functional block diagram of a first embodiment of a water pump start-stop control system according to an embodiment of the present utility model.

As shown in fig. 1, the water pump start-stop control system according to the present embodiment includes: a radar level gauge 10, a PLC controller 20 and a soft start module 30;

the PLC 20 is respectively connected with the radar level gauge 10 and the soft start module 30, and the soft start module 30 is connected with the target water pump 1;

the radar level gauge 10 is configured to collect a current water level signal of the target water pump 1, and transmit the current water level signal to the PLC controller 20;

the PLC controller 20 is configured to output a water pump driving signal to the soft start module 30 when it is monitored that the voltage value of the current water level signal reaches a first preset voltage value;

the soft start module 30 is configured to turn on a power supply loop of the target water pump 1 when the water pump driving signal is received.

It should be noted that the water pump start-stop control system provided in this embodiment may be applied to any device and application scenario where a water pump is required to be used for liquid delivery or liquid pressurization.

It should be understood that the radar level gauge 10 performs level measurement based on the time domain reflection principle, when the radar wave emitted by the radar level gauge 10 encounters the surface of the measured medium, a part of the radar wave of the radar level gauge 10 is reflected to form an echo and returns to the radar wave emitting device along the same path, the distance between the emitting device and the surface of the measured medium is proportional to the propagation time of the radar wave therebetween, and the level height can be obtained through calculation, so that the radar level gauge 10 is suitable for performing non-contact continuous measurement on the liquid level, and therefore, the present embodiment adopts the radar level gauge 10 to measure the liquid level of the target water pump 1. In practical applications, the radar level gauge 10 has one end connected to the positive pole of a switching power supply (dc, 24V), and the other end connected to the first end of a resistor and the liquid level input end of the PLC controller 20, respectively, and the second end of the resistor is connected to the negative pole of the switching power supply (dc, 24V), where the switching power supply can provide power for the PLC controller. When detected, the radar level gauge 10 may output a level gauge signal of 4-20 milliamps (i.e. the current water level signal) and then be converted by the resistor into a voltage signal (i.e. the voltage value of the current water level signal) recognizable by the PLC controller 20.

It should be noted that, the PLC controller 20 may provide a plurality of analog and digital input/output ports, and process and convert input/output signals into data, thereby implementing data acquisition, fault diagnosis and device control of the device. Specifically, the present embodiment may employ a siemens 6ES7212-1AE40-0XB0 compact CPU 1212C, and the PLC controller of this type may fully meet the requirements of the small and medium-sized automation system, although other types of PLC controllers may also be employed, which is not limited in this embodiment.

It can be understood that the first preset voltage value is a voltage value corresponding to when the target water pump 1 reaches the first preset water level, and the first preset water level is a safe water level capable of starting the water pump, where the first preset water level may be a safe water level already set in the PLC controller 20, or may be a safe water level immediately input by a person associated with water pump control based on a specific situation through a touch screen connected to the PLC controller 20, and the specific setting mode of the first preset water level is not limited in this embodiment. When the PLC controller 20 monitors the first preset voltage value, the soft start module 30 immediately outputs a water pump driving signal, and the soft start module 30 immediately turns on the power supply circuit of the target water pump 1 after receiving the water pump driving signal, so as to turn on the target water pump 1.

It should be noted that, the soft starter module may be used to reduce the current of the power supply loop of the target water pump 1, to realize smooth starting of the target water pump 1, and to avoid tripping caused by overcurrent during starting.

It can be appreciated that the PLC controller 20 may also be configured to output a water pump stop signal to the soft start module 30 when it is detected that the voltage value of the current water level signal reaches a second preset voltage value;

correspondingly, the soft start module 30 may be further configured to disconnect the power supply loop of the target water pump 1 when the water pump stop signal is received.

It should be noted that, the second preset voltage value is a voltage value corresponding to when the target water pump 1 reaches the second preset water level, and the second preset water level is a safe water level capable of closing the water pump, and the second preset water level may also be a safe water level already set in the PLC controller 20 or set by a person related to water pump control based on specific conditions, so the specific setting mode of the second preset water level is not limited in this embodiment.

It can be understood that the second preset water level is a safe water level capable of closing the water pump, but in order to avoid the situation that the water pump is dry and burnt out due to the failure of closing the water pump when the second preset water level is out of control, a float switch is further provided as a protection measure in the embodiment.

Further, the water pump start-stop control system further comprises: a float switch;

wherein, the float switch is connected with the PLC 20 and is arranged at a preset liquid level line of the water pump;

the float switch is configured to output a cut-off signal to the PLC controller 20 when the water level of the target water pump 1 reaches the preset level line;

the PLC controller 20 is further configured to output the water pump stop signal to the soft start module 30 when the cut-off signal is received;

the soft start module 30 is further configured to disconnect the power supply loop of the target water pump 1 when the water pump stop signal is received.

It should be noted that, in practical application, one end of the float switch is connected to the cut-off signal input port of the PLC controller 20, and the other end is connected to the l+ interface (corresponding to the connection of the dc voltage positive electrode) of the PLC controller 20, where the float switch is installed at the preset liquid level line (i.e. the lowest liquid level line of the target water pump 1), and can be fixedly installed by a wall through a 304 round tube sleeving wire, when the liquid level of the target water pump 1 exceeds the lowest liquid level line, the cut-off signal input port and the l+ interface are disconnected, and the cut-off signal input end has no voltage, so that the target water pump 1 can automatically operate; when the liquid level of the target water pump 1 is reduced to the lowest liquid level line, the floating ball switch is triggered, the cut-off signal input port and the L+ interface are closed, the cut-off signal input end inputs direct current voltage, and the PLC 20 immediately sends a water pump stop signal to the soft start module 30 after detecting the input signal of the cut-off signal input port to stop the target water pump 1.

In this embodiment, a water pump start-stop control system is disclosed, which includes: a radar level gauge 10, a PLC controller 20 and a soft start module 30; the PLC controller 20 is respectively connected with the radar level gauge 10 and the soft start module 30, and the soft start module 30 is connected with the target water pump 1; the radar level gauge 10 is used for acquiring a current water level signal of the target water pump 1 and transmitting the current water level signal to the PLC 20; the PLC controller 20 is configured to output a water pump driving signal to the soft start module 30 when it is monitored that the voltage value of the current water level signal reaches a first preset voltage value; the soft start module 30 is configured to turn on a power supply loop of the target water pump 1 when receiving the water pump driving signal; the PLC controller 20 may be further configured to output a water pump stop signal to the soft start module 30 when it is monitored that the voltage value of the current water level signal reaches a second preset voltage value; correspondingly, the soft start module 30 may be further configured to disconnect the power supply loop of the target water pump 1 when the water pump stop signal is received. Unlike the existing manual observation and lower-precision water pump control method, the embodiment is based on the radar level gauge 10 to collect the accurate current water level of the target water pump 1, and then when the voltage value corresponding to the water level of the target water pump 1 is monitored to reach the preset voltage through the PLC 20, namely, when the water level representing the target water pump 1 reaches the preset water level, a water pump driving signal is rapidly output or the water pump stops to the soft starting module 30, so that the soft starting module 30 rapidly conducts or cuts off a power supply loop of the target water pump 1; and the float switch prevents the target water pump 1 from continuing to work when the target water pump drops to the lowest liquid level. Therefore, the embodiment constructs an accurate and effective water pump start-stop control system based on the radar level gauge 10, the PLC controller 20 and the soft start module card, and improves the control precision of the target water pump 1.

Referring to fig. 2, fig. 2 is a functional block diagram of a second embodiment of a water pump start-stop control system according to an embodiment of the present utility model.

Based on the first embodiment, a second embodiment of the water pump start-stop control system of the present utility model is provided.

In this embodiment, in order to transmit the water pump driving signal from the PLC controller 20 to the soft start module 30, the water pump start-stop control system further includes: operating the relay 40;

wherein the operation relay 40 is provided between the PLC controller 20 and the soft start module 30;

the PLC controller 20 is further configured to output the water pump driving signal or the water pump stopping signal to the operation relay 40;

the operation relay 40 is configured to conduct a control contact of the soft start module 30 when receiving the water pump driving signal;

the soft start module 30 is further configured to turn on a power supply loop of the target water pump 1 when the control contact is turned on;

the operation relay 40 is further configured to open a control contact of the soft start module 30 when receiving the water pump stop signal;

the soft start module 30 is further configured to disconnect the power supply circuit of the target water pump 1 when the control contact is opened.

The operation relay 40 includes: the first end of the first coil is connected with the negative electrode of the switching power supply, the second end of the first coil is connected with the operation output end of the PLC controller 20, and the first end and the second end of the first contact are connected with the soft start module 30. In practical application, when the PLC controller 20 outputs the water pump driving signal to the first coil of the operation relay 40 through the operation output end, after the first coil is powered on, the first contact corresponding to the first coil (the contact may be a normally open contact of the operation relay 40) is controlled to be closed, and the first contact is the control contact of the soft start module 30, so that after the first contact is closed, the soft start module 30 conducts the power supply loop of the target water pump 1 corresponding to the first contact, and the target water pump 1 is opened. Similarly, when the PLC controller 20 outputs the water pump stop signal to the first coil of the operation relay 40 through the operation output terminal, the first contact corresponding to the first coil is controlled to be opened after the first coil is powered off, and therefore, after the first contact is opened, the soft start module 30 disconnects the power supply circuit of the target water pump 1 corresponding to the first contact, so that the target water pump 1 is stopped.

In addition, in order to facilitate the staff to better observe the working water pump of the target water pump 1, in this embodiment, the water pump start-stop control system further includes: an operation indicator lamp 50, an input power source, and a first circuit breaker; the operation relay 40 further includes: a second contact;

the first end of the second contact is connected with the live wire of the output end of the first circuit breaker, the live wire of the output end of the first circuit breaker is connected with the live wire of the input end of the switching power supply, the live wire of the input end of the first circuit breaker is connected with the live wire of the input power supply, the second end of the second contact is connected with the first end of the running indicator lamp 50, and the second end of the running indicator lamp 50 is connected with the zero line of the input power supply.

It will be appreciated that the input power source may be a dc 220v power source for supplying power to the contacts and the indicator lights, the second contact of the operating relay 40 may be a normally open contact of the operating relay 40, and the second contact is turned off when the coil of the operating relay 40 is not energized, and the operating indicator lights 50 are not energized; and when the second contact is closed after the coil of the operation relay 40 is energized, the operation indicator lamp 50 is energized, so that after the coil of the operation relay 40 is energized, the target water pump 1 is started due to the closed conduction power supply loop of the first contact, and the operation indicator lamp 50 is lighted due to the closed second contact.

It should be understood that the PLC controller 20 may detect whether the target water pump 1 is faulty, and when the PLC controller 20 detects the fault of the target water pump 1, the operator needs to be notified to check immediately, so further, in this embodiment, the water pump start-stop control system further includes: a fault indicator light 70 and a fault relay 60; the water pump start-stop control system further comprises: a fault indicator light 70 and a fault relay 60; the fault relay 60 includes: a first fault coil and a fault contact;

wherein, a first end of the first fault coil is connected with a negative electrode of the switching power supply, and a second end of the first fault coil is connected with a fault output end of the PLC controller 20;

the first end of the fault contact is connected with the live wire of the output end of the first circuit breaker, the second end of the second contact is connected with the first end of the fault indicator lamp 70, and the second end of the fault indicator lamp 70 is connected with the zero line of the input power supply.

The fault contact may be a normally open contact, and thus the fault contact is opened when the input power (i.e., dc 220V) is first turned on, and thus the fault indicator 70 is not energized. When the PLC controller 20 detects that the target water pump 1 fails, a signal is output to the first fault coil through the fault output end, and after the first fault coil is energized, the fault contact corresponding to the first fault coil is closed, so that the fault indicator lamp 70 is energized and is turned on, thereby notifying the relevant staff to check the target water pump 1, and the manner of notifying the relevant staff may also be to trigger an alarm bell, send an alarm string to the relevant staff, etc., where the specific manner of notifying the alarm is not limited in comparison with the embodiment.

It will be appreciated that the PLC controller 20 may also detect if the soft starter is malfunctioning and control the soft starter to stop operating when a malfunction of the soft starter is detected.

Further, in the present embodiment, the soft start module 30 includes: the soft starter, the power supply, the second circuit breaker and the soft start fault contact;

the first fault output and the second fault output of the soft starter are both connected to the soft start fault output of the PLC controller 20.

The soft starter is a device for reducing the starting current of the target water pump 1 in the soft starting module 30 and ensuring the smooth starting of the target water pump 1, the target motor may be a device for driving the target water pump 1 to pump water, the circuit breaker is a device for protecting a power supply circuit, and the circuit breaker automatically cuts off the power supply circuit when the power supply circuit has an overload or short circuit and other faults. Taking fig. 3 as an example for illustration, fig. 3 is a schematic diagram of a soft start module in a second embodiment of a water pump start-stop control system according to an embodiment of the present utility model, as shown in fig. 3, the soft starter is connected with a power supply AC (specifically, may be 380v,50 hz) through a second circuit breaker QF, where L1, L2, L3 correspond to an input end of the second circuit breaker QF, a R, S, T end is a terminal of the soft starter, a U, V, W end is an outlet end of the soft starter, and M represents a target motor. In addition, the first fault output end 5 of the soft starter is connected with the l+ interface of the PLC controller 20, the second fault output end 6 is connected with the first soft start fault end di.6 of the PLC controller 20, the soft stop input end 8 and the start input end 9 of the soft starter are connected with the first end of the first contact KA11, the second end of the first contact KA11 is connected with the instantaneous stop input end 7 and the common end 10 of the soft starter, the instantaneous stop input end 7, the soft stop input end 8 and the start input end 9 correspond to different input signals, in practical application, when the PLC controller 20 detects a soft starter fault, the PLC controller 20 outputs a soft start fault signal through the soft start fault output end, so that the loops corresponding to the fault output ends 5 and 6 of the soft starter are connected, and the soft starter stops working, and the target water pump 1 corresponding to the soft starter stops working. When the PLC controller 20 detects that the soft starter is normal, the output of the soft start fault signal is stopped, and the loops corresponding to the first fault output terminal 5 and the second fault output terminal 6 of the soft starter are disconnected, so that the soft starter is restored to normal operation, and the target water pump 1 corresponding to the soft starter is also restored to normal operation.

In this embodiment, the water pump start-stop control system further includes: an operation relay 40, the operation relay 40 being disposed between the PLC controller 20 and the soft start module 30; the PLC controller 20 is further configured to output a water pump driving signal or a water pump stopping signal to the operation relay 40; an operation relay 40 for switching on the control contact of the soft start module 30 when receiving the water pump driving signal, and for switching on the power supply loop of the target water pump 1 when the control contact is switched on; the operation relay 40 is further used for opening a control contact of the soft start module 30 when receiving a water pump stop signal, and the soft start module 30 is further used for opening a power supply loop of the target water pump 1 when the control contact is opened. Therefore, the present embodiment realizes the rapid signal transmission between the PLC controller 20 and the soft start module 30 by operating the relay 40, thereby realizing the rapid start and stop of the target water pump 1 and improving the accuracy of the water pump start and stop control. In addition, the water pump start-stop control system further comprises: fault indicator 70 and fault relay 60, fault relay 60 includes: a first fault coil and a fault contact; the soft start module 30 includes: the soft starter, the power supply, the second circuit breaker and the soft start fault contact point, therefore, the embodiment can also realize fault detection of the target water pump 1 and the soft starter, and remind a worker or stop the work of the soft starter and the target water pump 1 through the indicator lamp when faults occur, so that the safety of the embodiment is improved.

Referring to fig. 4, fig. 4 is a functional block diagram of a third embodiment of a water pump start-stop control system according to an embodiment of the present utility model.

Based on the first embodiment and the second embodiment, a third embodiment of the water pump start-stop control system of the present utility model is provided.

It can be understood that, in order to facilitate the manual control of the related staff in the field when the automatic control fails or is inconvenient to perform the automatic control, the present embodiment may further provide a manually controlled water pump control method, and specifically, in this embodiment, the water pump start-stop control system further includes: a mode changeover switch 80;

wherein, the first end of the mode change-over switch 80 is connected with the switching power supply, and the second end is connected with the change-over input end of the PLC controller 20;

the mode change-over switch 80 is configured to obtain a change-over signal input from the outside and transmit the change-over signal to the PLC controller 20;

the PLC controller 20 is further configured to select an operation mode corresponding to the conversion signal when receiving the conversion signal.

The water pump start-stop control system further comprises: a start button 90 and a stop button 100;

wherein, the first end of the start button 90 is connected with the switch power supply, and the second end is connected with the start signal input end of the PLC controller 20; the first end of the stop button 100 is connected to the switching power supply, and the second end is connected to the stop signal input end of the PLC controller 20;

The start button 90 is configured to send a start signal to the PLC controller 20 when receiving the start signal inputted from the outside;

the PLC controller 20 is further configured to output the water pump driving signal to the soft start module 30 when receiving the start signal;

the stop button 100 is configured to transmit a stop signal to the PLC controller 20 when receiving the stop signal inputted from the outside;

the PLC controller 20 is further configured to output the water pump stop signal to the soft start module 30 when the stop signal is received.

It should be noted that, the above-mentioned conversion signal may be a selection signal of manual control or automatic control, and in this embodiment, when the mode conversion switch 80 is turned on, that is, when the conversion input end of the PLC controller 20 inputs the conversion signal, the PLC controller 20 controls the current working mode to be changed from the manual control mode to the automatic control mode; alternatively, when the mode changeover switch 80 is turned off, that is, when no signal is input to the changeover input terminal of the PLC controller 20, the PLC controller 20 may control the current operation mode to be changed from the automatic control mode to the manual control mode, and the specific changeover mode is not limited thereto in this embodiment. However, in the automatic control mode, the start signal (or the stop signal input by the stop button 100) input by the start button 90 is shielded by the PLC controller 20, that is, the signals at the start signal input end and the stop signal input end of the PLC controller 20 under the automatic control module are not valid. In the manual mode, the PLC controller 20 may still transmit the water pump driving signal and the water pump stopping signal to the soft start module 30 by operating the relay 40.

It can be understood that the above-mentioned water pump start-stop control system further includes a preset number of start buttons 90, stop buttons 100, an operation relay 40, an operation indicator 50, a fault relay 60, a fault indicator 70, and a soft starter; the first end of each start button 90 is connected with the switch power supply, and the second end is connected with the corresponding start signal input end of the PLC controller 20; the first end of each stop button 100 is connected with the switching power supply, and the second end is connected with the corresponding stop signal input end of the PLC controller 20; each operation relay 40 is respectively connected with the operation indicator lamp 50, the operation output end of the PLC controller 20 and the soft starter; each fault relay 60 is connected with the corresponding fault indicator lamp 70, the fault output end of the PLC controller 20 and the soft starter; each soft starter is connected with the corresponding second circuit breaker, the soft start fault end of the PLC controller 20 and the target motor. In this embodiment, the plurality of water pumps may be controlled simultaneously, that is, the preset number may be greater than one, and the specific value of the preset number may be selected according to the number of ports of the selected PLC control model and the specific application scenario, which is not limited in this embodiment. In this embodiment, the preset number may be 2, and illustrated in fig. 5, where fig. 5 is a schematic diagram of connection of the PLC controller 20 in the third embodiment of the water pump start-stop control system provided in the embodiment of the present utility model, as shown in fig. 5, where the positive power input terminals l+ and 3l+ of the PLC controller 20 are connected to the positive pole of the switching power DC24V, the negative power input terminals M, 1M, 2M and 3M of the PLC controller 20 are connected to the negative pole of the switching power DC24V, the switching input terminal di.0 is connected to the first end of the mode switching switch SA, the first start signal input terminal di.1 is connected to the first start button SB1, the first stop signal input terminal di.2 is connected to the first stop button SB2, the second start signal input terminal di.3 is connected to the second start button SB3, the cut-off signal input terminal di.4 is connected to the second stop button SB4, the cut-off signal input terminal di.5 is connected to the floating ball switch SB5, the first soft start fault terminal di.6 is connected to the first soft starter, the second soft start-stop signal input terminal dq 7 is connected to the second soft start button dq, the second stop signal input terminal dq 7 is connected to the second start button dq 1.dq, the second stop signal input terminal dq 0 is connected to the second start signal input terminal dq 1.sb 2, and the second stop signal input terminal SB2 is connected to the second stop signal 1.sb 2, and the first stop signal is connected to the first stop signal 1.

The water pump start-stop control system of this embodiment further includes: a mode changeover switch 80; wherein, the first end of the mode change-over switch 80 is connected with the switching power supply, and the second end is connected with the change-over input end of the PLC controller 20; a mode changeover switch 80 for acquiring a changeover signal inputted from the outside and transmitting the changeover signal to the PLC controller 20; the PLC controller 20 is further configured to select an operation mode corresponding to the conversion signal when the conversion signal is received. The water pump start-stop control system further comprises: a start button 90 and a stop button 100; wherein, the first end of the start button 90 is connected with the switch power supply, and the second end is connected with the start signal input end of the PLC controller 20; the first end of the stop button 100 is connected with the switching power supply, and the second end is connected with the stop signal input end of the PLC controller 20; a start button 90 for transmitting a start signal to the PLC controller 20 upon receiving an externally input start signal; the PLC controller 20 is further configured to output a water pump driving signal to the soft start module 30 when receiving the start signal; a stop button 100 for transmitting a stop signal to the PLC controller 20 upon receiving the externally inputted stop signal; the PLC controller 20 is further configured to output a water pump stop signal to the soft start module 30 upon receiving the stop signal. Therefore, the embodiment provides a water pump start-stop control method in a manual mode, and provides another control method when automatic control fails or automatic control is inconvenient, so that the reliability of a water pump start-stop control system is improved.

The foregoing description is only of the preferred embodiments of the present utility model, and is not intended to limit the scope of the utility model, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims

1. A water pump start-stop control system, the water pump start-stop control system comprising: the system comprises a radar liquid level gauge, a PLC controller and a soft start module;

2. The water pump start-stop control system of claim 1, further comprising: a float switch;

3. The water pump start-stop control system of claim 2, further comprising: operating a relay;

4. A water pump start-stop control system as set forth in claim 3, wherein said run relay comprises: a first coil and a first contact;

5. The water pump start-stop control system of claim 4, further comprising: the operation indicator lamp, the input power supply and the first circuit breaker; the operating relay further includes: a second contact;

6. The water pump start-stop control system of claim 5, further comprising: a fault indicator light and a fault relay; the fault relay includes: a first fault coil and a fault contact;

7. The water pump start-stop control system of claim 6, wherein the soft start module comprises: the soft starter, the power supply and the second circuit breaker;

8. The water pump start-stop control system of claim 7, further comprising: a mode changeover switch;

9. The water pump start-stop control system of claim 8, further comprising: a start button and a stop button;

10. The water pump start-stop control system of claim 9, further comprising a predetermined number of start buttons, stop buttons, run relays, run indicator lights, fault relays, fault indicator lights, and soft-starters;