Switching control system for fault self-inspection and operation maintenance of water pump

Abstract

The invention relates to the field of water supply and drainage systems, and discloses a switching control system for fault self-inspection and operation maintenance of a water pump, which is characterized by comprising a mode selection module for selecting an automatic or manual mode of the system; the water pump control module is connected with the mode selection module and is used for controlling the start and stop of each water pump according to the output of the mode selection module; the water pump state detection module is connected with the water pump control module and used for detecting the fault state of the water pump; the programmable logic controller module is connected with the mode selection module, the water pump control module and the water pump state detection module, integrates input and output of the mode selection module, the water pump control module and the water pump state detection module, and is used for realizing control logic of the water pump; and the water pump execution module is connected with the programmable logic controller module and is used for executing starting and stopping of the water pump. According to the invention, the efficiency, flexibility and reliability of switching control of water pump fault self-inspection and operation maintenance are effectively improved.

Description

Technical Field

[0001] The present application relates to the field of water supply and drainage systems, and in particular to water pump fault detection and maintenance control technology. Background Art

[0002] Water pumps are widely used in various industrial and civil applications. In order to ensure the stable operation and high efficiency of water pumps, the switching control method is widely used. At present, the existing water pump switching control methods mainly include two control modes: automatic and manual. The operator can select the manual and automatic state of the system by switching the switch.

[0003] In manual mode, the operator can use the transfer switch of each pump to start and stop each pump, thereby achieving direct control of the water pump.

[0004] In automatic mode, the system will automatically start and stop each pump under the control of a relay or programmable controller according to preset control parameters (such as pressure, liquid level, temperature, etc.) to meet actual work needs.

[0005] Although this control method can meet general control needs, it still has some obvious shortcomings in practical applications. For example, it is not fault-tolerant enough: when the system is in automatic operation, if a pump fails, the existing system cannot automatically isolate the failed pump and reassemble the normal operating pump, which may cause the entire system to shut down or unstable operation. Unstable system operation during maintenance: During routine inspections or repairs of pumps, the existing method cannot ensure the normal operation of the entire system, which may reduce the effectiveness of the system and may even pose a safety hazard. Insufficient system control flexibility: Since the existing system's logical control method is fixed and single, the operator cannot independently select and configure the required pump combination according to the actual situation and needs on site.

[0006] In order to solve the above problems, researchers have been seeking a new technical solution to improve the efficiency, flexibility and reliability of the water pump switching control method. This application is proposed to meet this demand. Summary of the invention

[0007] The purpose of the present application is to provide a water pump fault self-detection and operation maintenance switching control system to solve the problems raised in the above background technology.

[0008] The present application discloses a water pump fault self-detection and operation maintenance switching control system, comprising:

[0009] A mode selection module is used to select the automatic or manual mode of the system;

[0010] A water pump control module, connected to the mode selection module, for controlling the start and stop of each water pump according to the output of the mode selection module;

[0011] A water pump status detection module, connected to the water pump control module, for detecting a fault status of the water pump;

[0012] A programmable logic controller module is connected to the mode selection module, the water pump control module and the water pump state detection module, integrates the input and output of the mode selection module, the water pump control module and the water pump state detection module, and is used to implement the control logic of the water pump;

[0013] The water pump execution module is connected to the programmable logic controller module and is used to execute the start and stop of the water pump.

[0014] In a preferred example, the mode selection module includes a mode selection switch, a mode selection relay and a water pump combination relay;

[0015] The water pump control module includes a water pump selection switch corresponding to each water pump, a water pump control relay corresponding to each water pump, and a water pump maintenance selection switch corresponding to each water pump;

[0016] The water pump status detection module includes a thermal relay corresponding to each water pump, an overheat alarm relay corresponding to each water pump, and a water pump overheat alarm indicator light corresponding to each water pump;

[0017] The water pump execution module includes a water pump main contactor corresponding to each water pump and a water pump operation indicator light corresponding to each water pump.

[0018] In a preferred example, the mode selection switch is connected to the coils of the mode selection relay and the water pump combination relay to select the automatic and manual states of the system;

[0019] The water pump selection switch is connected to the coil of the corresponding water pump control relay to control the switching of each water pump;

[0020] One end of the water pump maintenance selection switch is connected to the open contact of the corresponding water pump control relay, and the other end is connected to the closed contact of the mode selection relay, and the other end of the open contact of the water pump control relay is connected to the open contact of the water pump combination relay to switch the water pump control;

[0021] The open contact of the thermal relay is connected to the coil of the corresponding overheat alarm relay and the corresponding water pump overheat alarm indicator light to indicate the corresponding water pump failure;

[0022] The logic input points of the programmable logic controller module are connected to the open contacts of the mode selection relay, the water pump control relay, and the overheat alarm relay to collect the water pump status;

[0023] The logic output point of the programmable logic controller module is connected to the coil of the corresponding water pump main contactor and the corresponding water pump operation indicator light to control the operation of the water pump.

[0024] In a preferred example, the mode selection switch is used to select the automatic or manual mode of the system, the mode selection relay is used to latch the selected mode, and the water pump combination relay is used to execute the mode switching.

[0025] In a preferred example, the water pump selection switch is used to select the start and stop of the corresponding water pump, the water pump control relay is used to control the start and stop of the corresponding water pump, and the water pump maintenance selection switch is used to cut off the corresponding water pump for maintenance.

[0026] In a preferred example, the thermal relay is used to detect overheating of the corresponding water pump, the overheating alarm relay is used to control the corresponding overheating alarm, and the water pump overheating alarm indicator light is used to indicate the corresponding water pump overheating alarm.

[0027] In a preferred example, the water pump main contactor is used to start and stop the corresponding water pump.

[0028] In a preferred example, the water pump operation indicator light is used to indicate the operating status of the corresponding water pump.

[0029] In the implementation manner of the present application, the mode selection module of the switching control system for water pump fault self-detection and operation maintenance is used to select the automatic or manual mode of the system; the water pump control module is connected to the mode selection module, and is used to control the start and stop of each water pump according to the output of the mode selection module; the water pump state detection module is connected to the water pump control module, and is used to detect the fault state of the water pump; the programmable logic controller module is connected to the mode selection module, the water pump control module and the water pump state detection module, and integrates the input and output of the mode selection module, the water pump control module and the water pump state detection module to implement the control logic of the water pump; the water pump execution module is connected to the programmable logic controller module, and is used to execute the start and stop of the water pump. The switching control system for water pump fault self-detection and operation maintenance has the following technical effects:

[0030] Enhanced fault tolerance: In traditional methods, when a water pump fails during automatic operation of the system, the system cannot isolate the failed pump and reconfigure a new system to operate. However, this application can automatically isolate the failed pump and reconfigure a normal operating water pump when a water pump failure is detected, ensuring stable operation of the system.

[0031] Ensure system stability during maintenance: When routinely inspecting or repairing water pumps, traditional methods cannot ensure the normal operation of the entire system. This application allows other water pumps to continue to operate normally while some water pumps are being repaired, ensuring that the system will not be completely shut down due to maintenance of a single component.

[0032] Provide flexible pump combination selection: Traditional system logic control is fixed and single, and it is impossible to select the number of pumps to be put into the system according to the actual situation on site. This application allows the operator to manually select and configure the required pump combination according to actual needs and scenarios, increasing the flexibility of the system.

[0033] Improve the adaptive capability of the system: This application can not only automatically start and stop the water pump according to the control parameters (such as pressure, liquid level, temperature, etc.), but also automatically adjust the working combination of the water pump when encountering specific situations or failures, making the system more intelligent and adaptive.

[0034] Improve the overall efficiency and reliability of the system: This application significantly improves the overall efficiency and reliability of the water pump system by automatically isolating faulty pumps, ensuring system stability during maintenance, and providing flexible water pump combination selection.

[0035] In summary, the present application brings a series of significant technical effects and advantages to the switching control of water pumps, fully solves the problems existing in traditional methods, and provides a more efficient, flexible and reliable solution.

[0036] A large number of technical features are recorded in the specification of this application, which are distributed in various technical solutions. If all possible combinations of technical features of this application (i.e., technical solutions) are to be listed, the specification will be too long. In order to avoid this problem, the various technical features disclosed in the above content of this application, the various technical features disclosed in the various embodiments and examples below, and the various technical features disclosed in the accompanying drawings can be freely combined with each other to form various new technical solutions (these technical solutions are all considered to have been recorded in this specification), unless the combination of such technical features is technically infeasible. For example, in one example, feature A+B+C is disclosed, and in another example, feature A+B+D+E is disclosed, and features C and D are equivalent technical means that play the same role. Technically, only one can be used, and it is impossible to use them at the same time. Feature E can be combined with feature C technically. Then, the solution of A+B+C+D should not be considered to have been recorded because it is technically infeasible, and the solution of A+B+C+E should be considered to have been recorded. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of a water pump fault self-detection and operation maintenance switching control system according to the first embodiment of the present application;

[0038] Figure 2 It is another structural schematic diagram of the switching control system for water pump fault self-detection and operation maintenance according to the first embodiment of the present application;

[0039] Figure 3 It is a schematic diagram of the principle of the switching control system for water pump fault self-detection and operation maintenance according to the first embodiment of the present application. DETAILED DESCRIPTION

[0040] In the following description, many technical details are provided to help readers better understand the present application. However, those skilled in the art can understand that the technical solution claimed in the present application can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0041] Description of some concepts:

[0042] Mode selection module, a component for selecting automatic or manual control mode of the water pump system.

[0043] The water pump control module is a component used to control the start and stop switching of the water pump.

[0044] The water pump status detection module is a component used to detect the fault status of the water pump.

[0045] Programmable logic controller module uses a programmable logic controller to implement the water pump control logic.

[0046] The water pump execution module is a component used to execute the start and stop operations of the water pump.

[0047] A transfer switch is a switch used to select different working modes or states.

[0048] Intermediate relay, intermediate actuator, used to transmit control signals.

[0049] Thermal relay, which detects temperature through thermistor and controls the relay of water pump fault alarm.

[0050] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0051] The first embodiment of the present application relates to a water pump fault self-detection and operation maintenance switching control system, the structure of which is as follows: Figure 1 and Figure 2 As shown, the switching control system for the pump fault self-detection and operation maintenance includes:

[0052] A mode selection module is used to select the automatic or manual mode of the system;

[0053] A water pump control module, connected to the mode selection module, for controlling the start and stop of each water pump according to the output of the mode selection module;

[0054] A water pump status detection module, connected to the water pump control module, for detecting a fault status of the water pump;

[0055] A programmable logic controller module is connected to the mode selection module, the water pump control module and the water pump state detection module, integrates the input and output of the mode selection module, the water pump control module and the water pump state detection module, and is used to implement the control logic of the water pump;

[0056] The water pump execution module is connected to the programmable logic controller module and is used to execute the start and stop of the water pump.

[0057] Optionally, the mode selection module comprises a mode selection switch (SA1), a mode selection relay (KA1) and a water pump combination relay (KA2);

[0058] Optionally, the water pump control module includes water pump selection switches (SA2), (SA3), (SA4), water pump control relays (KA3), (KA4), (KA5) and water pump maintenance selection switches (SA5), (SA6), (SA7);

[0059] Optionally, the water pump status detection module includes thermal relays (KH1), (KH2), (KH3), overheat alarm relays (KA6), (KA7), (KA8) and water pump overheat alarm indicator lights (HL4), (HL5), (HL6);

[0060] Optionally, the water pump execution module includes water pump main contactors (KM1), (KM2), (KM3) and water pump operation indicator lights (HL1), (HL2), (HL3).

[0061] Optionally, the mode selection switch (SA1) is connected to the coils of the mode selection relay (KA1) and the water pump combination relay (KA2) to select the automatic and manual states of the system;

[0062] Optionally, the water pump selection switches (SA2), (SA3), (SA4) are connected to the coils of the water pump control relays (KA3), (KA4), (KA5) to control the switching of each water pump;

[0063] Optionally, one end of the water pump maintenance selection switch (SA5), (SA6), (SA7) is connected to the open contact of the water pump control relay (KA3), (KA4), (KA5), and the other end is connected to the closed contact of the mode selection relay (KA1), and the other end of the open contact of the water pump control relay (KA3), (KA4), (KA5) is connected to the open contact of the water pump combination relay (KA2) to switch the water pump control;

[0064] Optionally, the open contacts of the thermal relays (KH1), (KH2), (KH3) are connected to the coils of the overheat alarm relays (KA6), (KA7), (KA8) and the water pump overheat alarm indicator lights (HL4), (HL5), (HL6) to indicate a water pump failure;

[0065] Optionally, the logic input points (P00)-(P06) of the PLC are connected to the open contacts of the mode selection relay (KA1), the water pump control relay (KA3)-(KA5), and the overheat alarm relay (KA6)-(KA8) to collect the water pump status;

[0066] Optionally, the logic output points (P40)-(P42) of the PLC are connected to the coils of the water pump main contactors (KM1)-(KM3) and the water pump operation indicator lights (HL1)-(HL3) to control the operation of the water pump.

[0067] Optionally, the mode selection switch (SA1) is used to select the automatic or manual mode of the system.

[0068] Optionally, the mode selection switch (SA1) is a multi-position switch, and different positions of the switch correspond to the automatic or manual modes of the system; in the automatic mode, the system automatically controls the start and stop of the water pump according to the preset logic; in the manual mode, the start and stop of the water pump can be manually controlled. The output signal of the mode selection switch (SA1) is transmitted to the mode selection relay (KA1) to latch the currently selected mode.

[0069] Optionally, the mode selection relay (KA1) is used to latch the selected mode.

[0070] Optionally, the mode selection relay (KA1) is a two-wire intermediate relay, and its coil end receives the selection signal from the mode selection switch (SA1). When the mode selection switch selects the automatic mode, the mode selection relay (KA1) coil is energized, so that the normally open contact of the mode selection relay (KA1) is connected, and the system enters the automatic mode control; when the manual mode is selected, the mode selection relay (KA1) coil is released, so that the normally closed contact of the mode selection relay (KA1) is connected, and the system enters the manual mode control.

[0071] In this way, the latching function of the mode selection relay (KA1) can ensure that after the mode is selected, even if the mode selection switch returns to the middle position, the system can continue to operate in the selected mode, avoiding jitter caused by frequent switching of control modes.

[0072] Optionally, the water pump combination relay (KA2) is used to switch the execution mode.

[0073] Optionally, the water pump selection switches (SA2), (SA3), (SA4) are used to select the start or stop of the water pump.

[0074] Optionally, the water pump selection switches (SA2), (SA3), and (SA4) are multi-position switches, each switch including multiple positions, and different positions correspond to control selections for each water pump.

[0075] For example, the water pump selection switch (SA2) includes two positions: "water pump 1 enabled" and "water pump 1 disabled". In the "water pump 1 enabled" position, the signal output by the water pump selection switch (SA2) incorporates water pump 1 into the system control logic; in the "water pump 1 disabled" position, the output signal of the water pump selection switch (SA2) will isolate water pump 1 and stop it from running.

[0076] The pump selection switches (SA3) and (SA4) are similar to (SA2) and are used to select the activation or deactivation of other pumps. In this way, by manually selecting the position combination of the switches, any combination of pumps can be selected to participate in the system control, thereby realizing the selection of the start and stop of the pumps.

[0077] Optionally, the water pump control relays (KA3), (KA4), and (KA5) are used to control the start and stop of the water pump.

[0078] Optionally, the water pump control relays (KA3), (KA4), and (KA5) are double-pole single-throw intermediate relays, and their coil ends are respectively connected to the outputs of the water pump selection switches (SA2), (SA3), and (SA4). When the water pump selection switch selects to enable the corresponding water pump, the coils of the water pump control relays (KA3), (KA4), and (KA5) are energized, so that their normally open contacts are connected, and the start and stop control signals of the water pump are allowed to pass; when the water pump selection switch selects to disable the corresponding water pump, the coils of the water pump control relays (KA3), (KA4), and (KA5) are released, so that their normally open contacts are disconnected, and the start and stop control signals of the water pump are isolated. In this way, the water pump control relays (KA3), (KA4), and (KA5) control the permission or isolation of the corresponding water pump start and stop control signals according to the selection signals of the water pump selection switches (SA2), (SA3), and (SA4), thereby realizing the control of the start and stop of the water pump.

[0079] Optionally, the water pump maintenance selection switches (SA5), (SA6), (SA7) are used to cut off the water pump for maintenance.

[0080] Optionally, the water pump maintenance selection switches (SA5), (SA6), and (SA7) are also multi-position switches, which have different effects on the water pump control when they are in different positions. For example, when the water pump maintenance selection switch (SA5) is switched to the "maintenance" position, the corresponding water pump will be removed from the system control logic and disconnected from the intermediate relay of the water pump control, causing the water pump to stop working. At this time, the water pump can be maintained without affecting the operation of other water pumps. When the maintenance is completed, the water pump maintenance selection switch (SA5) is switched back to the "run" position, and the water pump is connected to the control logic again to participate in system control. The functions of the water pump maintenance selection switches (SA6) and (SA7) are similar to those of the water pump maintenance selection switch (SA5), and are used to cut off the corresponding water pump for maintenance. In this way, the water pump maintenance selection switch realizes the function of quickly cutting off and restoring the water pump, making the maintenance of the water pump more convenient and quick.

[0081] Optionally, the thermal relays (KH1), (KH2), (KH3) are used to detect overheating of the water pump.

[0082] Optionally, the terminals of thermal relays (KH1), (KH2), and (KH3) are all equipped with a thermistor, which can detect the temperature of the water pump in real time. When the water pump is overheated, the resistance value of the thermistor will change significantly.

[0083] The thermal relay detects the voltage change across the thermistor. When the voltage exceeds the set overheat alarm threshold, the output contacts of the thermal relay are energized; when the temperature drops, the output contacts are reset.

[0084] In this way, the thermal relays (KH1), (KH2), and (KH3) can detect in real time whether the water pump is overheated by monitoring the temperature change of the water pump, output a fault signal, and monitor and alarm the water pump overheating fault.

[0085] Optionally, the overheat alarm relays (KA6), (KA7), (KA8) are used to control the overheat alarm.

[0086] Optionally, the overheat alarm relays (KA6), (KA7), and (KA8) are double-pole single-throw intermediate relays, and their coil ends are connected to the output ends of the thermal relays (KH1), (KH2), and (KH3). When the water pump is overheated, the corresponding thermal relay output is energized, so that the coils of the overheat alarm relays (KA6), (KA7), and (KA8) are energized, and its normally open contacts are connected, connecting the power supply line of the overheat indicator light. In this way, the overheat indicator light is lit, realizing a visual alarm. At the same time, the overheat alarm relay can also output the overheat signal to the PLC, so that the PLC can take corresponding measures, such as automatically cutting off the overheated water pump. Through the control of the overheat alarm relay, the monitoring alarm and subsequent control of the overheat condition of the water pump are realized.

[0087] Optionally, the water pump overheat alarm indicator lights (HL4), (HL5), (HL6) are used to indicate a water pump overheat alarm.

[0088] Optionally, the water pump overheat alarm indicator lights (HL4), (HL5), and (HL6) are connected to the normally open contact circuits of the overheat alarm relays (KA6), (KA7), and (KA8). When the water pump is overheated, the corresponding overheat alarm relay contacts are energized to close the indicator light circuit, so that the indicator lights up, and the on-site personnel can intuitively see the alarm information of the indicator lights. For example, when water pump 1 is overheated, the (KA6) contact is energized, and the (HL4) indicator lights up, indicating that water pump 1 is overheated; when water pump 2 is overheated, the (KA7) contact is energized, and the (HL5) indicator lights up, indicating that water pump 2 is overheated. In this way, the water pump overheat alarm indicator light intuitively displays the overheat alarm information of the water pump in a visual form, so that maintenance personnel can quickly locate the overheated water pump and handle it.

[0089] Optionally, the water pump main contactors (KM1), (KM2), and (KM3) are used to start and stop the water pump.

[0090] Optionally, the main contactors (KM1), (KM2), and (KM3) of the water pump are high-power AC contactors used to directly control the start and stop of the water pump motor. Their coils are connected to the output points of the PLC. When the PLC outputs a control signal, the contactor coils are energized and attracted, so that the main contacts of the contactor are closed, and the water pump motor is powered on and started; when the PLC output signal is disconnected, the main contacts of the contactor are opened, and the water pump motor is powered off and stopped. In this way, the main contactor of the water pump directly drives the start and stop of the water pump motor, and the execution system controls the start and stop of the water pump, realizing automatic or manual control of the start and stop of the water pump. Its high-power control capability ensures the smooth flow of current when the water pump motor is running.

[0091] Optionally, the water pump operation indicator lights (HL1), (HL2), (HL3) are used to indicate the operating status of the water pump.

[0092] Optionally, the water pump operation indicator lights (HL1), (HL2), and (HL3) display the running or stopping status of the water pump by whether the indicator lights themselves are on. They are connected to the power supply at the same side coil end of the water pump main contactor (KM1), (KM2), and (KM3). When the water pump starts, the main contactor is energized, and the water pump operation indicator lights (HL1), (HL2), and (HL3) light up accordingly; when the water pump stops, the main contactor is released, and the water pump operation indicator lights (HL1), (HL2), and (HL3) go out. In this way, through the on and off status of the water pump operation indicator lights, the on-site operator can clearly know the current running or stopping status of each water pump, so as to quickly judge the operation status of the system.

[0093] Working principle:

[0094] Combine the following Figure 3 The working principle of the water pump fault self-detection and operation maintenance switching control system of this embodiment is described as follows:

[0095] 1) Manual selection of water pump combination: The operator first manually selects the switching of each water pump according to the actual needs of the site through the water pump selection switch (SA2), (SA3), (SA4). The water pump will participate in system control only when it is selected to be in the state of being switched on, otherwise it will be in the isolated state. This design makes the system more user-friendly and can meet different scenarios and needs.

[0096] 2) Manual and automatic mode selection: The mode selection switch (SA1) is used to select the system's operating mode - manual or automatic. In manual mode, the operator can directly start and stop each pump that has been put into the system. In automatic mode, the pumps that have been put into the system will automatically start and stop according to the preset control parameters (such as pressure, liquid level, temperature, etc.).

[0097] 3) Automatic isolation of faulty pumps: When the system is in automatic mode and a pump fails, the system automatically isolates the faulty pump through the internal program of the programmable controller (PLC). Subsequently, the remaining normal pumps that have been put into the system will form a new system and continue to operate. This design improves the effectiveness and fault tolerance of the system.

[0098] 4) Flexible maintenance and inspection: When a water pump needs routine inspection or repair, the operator can manually cut off the water pump, so as not to affect the normal operation of other water pumps and the entire system. This ensures that the system can still maintain efficient operation during maintenance or inspection.

[0099] Since the system always runs in the high-efficiency area, unnecessary energy waste can be avoided, thus achieving energy saving.

[0100] Technical effects:

[0101] Enhanced fault tolerance: In traditional methods, when a water pump fails during automatic operation of the system, the system cannot isolate the failed pump and reconfigure a new system to operate. However, this application can automatically isolate the failed pump and reconfigure a normal operating water pump when a water pump failure is detected, ensuring stable operation of the system.

[0102] Ensure system stability during maintenance: When routinely inspecting or repairing water pumps, traditional methods cannot ensure the normal operation of the entire system. This application allows other water pumps to continue to operate normally while some water pumps are being repaired, ensuring that the system will not be completely shut down due to maintenance of a single component.

[0103] Provide flexible pump combination selection: Traditional system logic control is fixed and single, and it is impossible to select the number of pumps to be put into the system according to the actual situation on site. This application allows the operator to manually select and configure the required pump combination according to actual needs and scenarios, increasing the flexibility of the system.

[0104] Improve the adaptive capability of the system: This application can not only automatically start and stop the water pump according to the control parameters (such as pressure, liquid level, temperature, etc.), but also automatically adjust the working combination of the water pump when encountering specific situations or failures, making the system more intelligent and adaptive.

[0105] Improve the overall efficiency and reliability of the system: This application significantly improves the overall efficiency and reliability of the water pump system by automatically isolating faulty pumps, ensuring system stability during maintenance, and providing flexible water pump combination selection.

[0106] In general, this embodiment provides a more user-friendly, efficient, flexible and reliable water pump fault self-detection and operation maintenance switching control system, which can automatically respond to various fault conditions, ensure the continuous and stable operation of the water pump system, and achieve ideal energy-saving effects.

[0107] In order to better understand the technical solution of the present application, a specific example is provided below for illustration. The details listed in the example are mainly for ease of understanding and are not intended to limit the scope of protection of the present application.

[0108] See also Figure 1-Figure 3In the water pump fault self-check and operation maintenance switching control system of this example, the conversion switch (SA1) is connected to the coils of the intermediate relays (KA1) and (KA2) respectively, and the automatic and manual states of the system can be selected; the conversion switches (SA2), (SA3), and (SA4) are connected to the coils of the intermediate relays (KA3), (KA4), and (KA5) respectively to control the switching of each water pump; the conversion switches (SA5), (SA6), and (SA7) are connected to the open contacts of the intermediate relays (KA3), (KA4), and (KA5) on one side, and to the closed contacts of the intermediate relay (KA1) on the other side. The open contacts of (KA3), (KA4), and (KA5) are connected to the open contacts of the intermediate relay (KA2) on the other side, and the closed contacts of the three (KA1) are connected to the open contacts of the intermediate relay (KA2) on the other side. Figure 1 The logic output terminals (P40), (P41), (P42) of the programmable controller (PLC) are connected to indicate that each pump is manually started and stopped in the manual state of the system; the open contacts of the thermal relays (KH1), (KH2), (KH3) are respectively connected to the coils of the intermediate relays (KA6), (KA7), (KA8) and the indicator lights (HL4), (HL5), (HL6), indicating the failure of each water pump; Figure 1 The open contacts of the intermediate relays (KA1), (KA3), (KA4), (KA5), (KA6), (KA7), and (KA8) are respectively connected to the logic input points (P00), (P01), (P02), (P03), (P04), (P05), and (P06) of the programmable controller (PLC); the logic output points (P40), (P41), and (P42) of the programmable controller (PLC) are respectively connected to the coils of the AC contactors (KM1), (KM2), and (KM3) and the indicator lights (HL1), (HL2), and (HL3) to control and indicate the operation of each water pump.

[0109] The specific working principle of the water pump fault self-check and operation maintenance switching control system in this example is: first, the switching of each pump is manually selected through the conversion switches (SA2), (SA3), and (SA4) according to the actual needs on site. The water pump participates in the system control only when it is selected to be switched on, otherwise it is in an isolated state, which makes the system more user-friendly.

[0110] The conversion switch SA1 selects the manual and automatic states of the system. In the manual state, each water pump put into the system can be started and stopped manually. In the automatic state, the water pumps put into the system are automatically started and stopped according to the control parameters such as pressure, liquid level, temperature, etc.

[0111] When the system is in automatic mode and a pump fails, the internal program of the programmable controller (PLC) can automatically isolate the failed pump, and the remaining pumps can form a new system to continue normal operation, thus improving the effectiveness and fault tolerance of the system.

[0112] When routine inspection of the water pump or repair of a faulty pump is required on site, the water pump can be manually removed without affecting the normal operation of the remaining water pumps and the entire system, thereby improving the effectiveness of the system.

[0113] This example has the following technical effects:

[0114] The design is more user-friendly: the operator can select the water pump to be put into the system according to the actual situation on site without affecting the operation of the system;

[0115] Improved system effectiveness and fault tolerance: The system realizes full automatic control when it is automatic. When a water pump fails, the faulty pump is automatically isolated, and the remaining water pumps form a new system to continue normal operation;

[0116] Energy saving: Since the system is always in the high-efficiency operation area, there will be no energy waste, achieving a more ideal energy-saving effect.

[0117] It should be noted that in the application documents of this patent, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one" do not exclude the existence of other identical elements in the process, method, article or device including the elements. In the application documents of this patent, if it is mentioned that an action is performed according to an element, it means that the action is performed at least according to the element, which includes two situations: performing the action only according to the element, and performing the action according to the element and other elements. Expressions such as multiple, multiple, and multiple include 2, 2 times, 2 kinds, and more than 2, more than 2 times, and more than 2 kinds.

[0118] All documents mentioned in this application are considered to be included in the disclosure of this application as a whole, so that they can be used as the basis for modification when necessary. In addition, it should be understood that after reading the above disclosure of this application, those skilled in the art can make various changes or modifications to this application, and these equivalent forms also fall within the scope of protection claimed in this application.

Claims

1. A water pump fault self-detection and operation maintenance switching control system, characterized in that: Include: A mode selection module is used to select the automatic or manual mode of the system; A water pump control module, connected to the mode selection module, for controlling the start and stop of each water pump according to the output of the mode selection module; A water pump status detection module, connected to the water pump control module, for detecting a fault status of the water pump; A programmable logic controller module is connected to the mode selection module, the water pump control module and the water pump state detection module, integrates the input and output of the mode selection module, the water pump control module and the water pump state detection module, and is used to implement the control logic of the water pump; The water pump execution module is connected to the programmable logic controller module and is used to execute the start and stop of the water pump.

2. The system according to claim 1, characterized in that The mode selection module includes a mode selection switch, a mode selection relay and a water pump combination relay; The water pump control module includes a water pump selection switch corresponding to each water pump, a water pump control relay corresponding to each water pump, and a water pump maintenance selection switch corresponding to each water pump; The water pump status detection module includes a thermal relay corresponding to each water pump, an overheat alarm relay corresponding to each water pump, and a water pump overheat alarm indicator light corresponding to each water pump; The water pump execution module includes a water pump main contactor corresponding to each water pump and a water pump operation indicator light corresponding to each water pump.

3. The system according to claim 2, characterized in that The mode selection switch is connected to the coils of the mode selection relay and the water pump combination relay to select the automatic and manual states of the system; The water pump selection switch is connected to the coil of the corresponding water pump control relay to control the switching of each water pump; One end of the water pump maintenance selection switch is connected to the open contact of the corresponding water pump control relay, and the other end is connected to the closed contact of the mode selection relay, and the other end of the open contact of the water pump control relay is connected to the open contact of the water pump combination relay to switch the water pump control; The open contact of the thermal relay is connected to the coil of the corresponding overheat alarm relay and the corresponding water pump overheat alarm indicator light to indicate the corresponding water pump failure; The logic input points of the programmable logic controller module are connected to the open contacts of the mode selection relay, the water pump control relay, and the overheat alarm relay to collect the water pump status; The logic output point of the programmable logic controller module is connected to the coil of the corresponding water pump main contactor and the corresponding water pump operation indicator light to control the operation of the water pump.

4. The system according to claim 3, characterized in that The mode selection switch is used to select the automatic or manual mode of the system, the mode selection relay is used to latch the selected mode, and the water pump combination relay is used to execute the switching of the modes.

5. The system according to claim 3, characterized in that The water pump selection switch is used to select the start and stop of the corresponding water pump, the water pump control relay is used to control the start and stop of the corresponding water pump, and the water pump maintenance selection switch is used to cut off the corresponding water pump for maintenance.

6. The system according to claim 3, characterized in that The thermal relay is used to detect overheating of the corresponding water pump, the overheat alarm relay is used to control the corresponding overheat alarm, and the water pump overheat alarm indicator light is used to indicate the corresponding water pump overheat alarm.

7. The system according to claim 3, characterized in that The water pump main contactor is used to start and stop the corresponding water pump.

8. The system according to claim 3, characterized in that The water pump operation indicator light is used to indicate the operation status of the corresponding water pump.

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