Submersible sewage pump control system

Abstract

The utility model discloses a submersible sewage pump control system, which comprises a power supply module for supplying power to a water pump motor through an alternating current contactor; the control module comprises a manual control part and an automatic control part, the manual control part manually controls the alternating current contactor through a button, and the automatic control part controls the alternating current contactor through a first intermediate relay, a second intermediate relay and a third intermediate relay; the protector comprises a control unit and an acquisition module, the acquisition module acquires a fault signal of the water pump motor, and the control module receives the fault signal and controls the second intermediate relay according to an overload signal transmitted by the thermal relay; the timing inspection module comprises a first time relay and a second time relay and controls an alternating current contactor through a third intermediate relay so as to respectively control the starting period and the running time of the water pump motor; and the liquid level control module detects the liquid level of the pool and controls the alternating current contactor through the first intermediate relay. Manual and automatic control can be achieved, and the functions of overload protection, regular inspection and automatic liquid level detection are achieved.

Description

Technical Field

[0001] This application relates to the field of sewage discharge technology, and in particular to a submersible sewage pump control system. Background Technology

[0002] Currently, there are many existing methods for controlling sewage discharge, as well as many auxiliary functions and complex manufacturing processes. Some functions are used only occasionally or not at all, resulting in high costs.

[0003] Traditional control methods can meet most sewage control needs, but they also have some shortcomings:

[0004] (a) Poor compatibility: For sewage pumps with different start-up methods, different sewage control methods are required due to the different wiring of the main control circuit of the pump, resulting in poor compatibility.

[0005] (b) High cost: Due to the many functions and complex processes, the cost is very high.

[0006] This section is intended to provide background or context for understanding the implementation of this application and is for reference only. It should not be construed as an admission by the applicant that this section pertains to prior art that was disclosed before the filing date of this application. Utility Model Content

[0007] The purpose of this application is to provide a submersible sewage pump control system that performs timed inspections of the sewage pump's main circuit and the pump itself. It features protection against short circuits and overloads, and can achieve local manual and automatic level control, status indication, and communication-based pump status diagnosis. The system is simple in structure, easy to operate, and inexpensive, making it suitable for most common needs.

[0008] This application discloses a submersible sewage pump control system, including:

[0009] The power supply module is used to supply power to the water pump motor via an AC contactor;

[0010] The control module includes a manual control component and an automatic control component. The manual control component manually controls the on / off state of the AC contactor via a button, and the automatic control component controls the on / off state of the AC contactor via a first intermediate relay, a second intermediate relay, and a third intermediate relay.

[0011] The protector includes a control unit and a data acquisition module. The data acquisition module is used to acquire the fault signal of the water pump motor. The control unit receives the fault signal and controls the second intermediate relay according to the overload signal transmitted by the thermal relay connected to the AC contactor.

[0012] The timed inspection module includes a first time relay and a second time relay, which control the on / off state of the AC contactor through the third intermediate relay, so as to control the start-up cycle and the running time after start-up of the water pump motor respectively.

[0013] A liquid level control module is used to detect the liquid level in the water tank and control the on / off state of the AC contactor through the first intermediate relay.

[0014] In a preferred embodiment, the power supply module includes a circuit breaker, an AC contactor, and a thermal relay, wherein a three-phase five-wire power supply is connected to the circuit breaker, the output terminal of the circuit breaker is connected to the AC contactor, the output terminal of the AC contactor is connected to the thermal relay, and the output terminal of the thermal relay is connected to the water pump motor.

[0015] In a preferred embodiment, the control module includes a fuse, a changeover switch, a first button, a second button, a first intermediate relay, a second intermediate relay, and a third intermediate relay. The output terminal of the circuit breaker is connected to one end of the fuse, and the other end of the fuse is connected to the manual control input terminal of the changeover switch, the two automatic control input terminals of the changeover switch, the power supply terminal of the control unit, the normally open delay contact of the first time relay, and the normally open contact of the third intermediate relay. The manual control output terminal of the changeover switch is connected to the input terminal of the first button, and the output terminal of the first button is connected to the input terminal of the second button and the AC... The normally open auxiliary contact input terminal of the contactor and one automatic control output terminal of the changeover switch are respectively connected to the normally open auxiliary contact input terminal of the first intermediate relay and the normally open auxiliary contact input terminal of the third intermediate relay. The second button output terminal, the normally open auxiliary contact output terminal of the AC contactor, the normally open auxiliary contact output terminal of the first intermediate relay, and the normally open auxiliary contact output terminal of the third intermediate relay converge and are respectively connected to the control coil input terminal of the AC contactor. The control coil output terminal of the AC contactor is connected to the normally closed auxiliary contact input terminal of the second intermediate relay, and the normally closed auxiliary contact output terminal of the second intermediate relay is connected to the center line.

[0016] In a preferred embodiment, the control module further includes: a first indicator light, one end of which is connected to the other end of the fuse, and the other end of which is connected to the center line.

[0017] In a preferred embodiment, the control module further includes: a second indicator light, the input terminal of which is connected to the output terminal of the second button, the normally open auxiliary contact output terminal of the AC contactor, the normally open auxiliary contact output terminal of the first intermediate relay, and the normally open auxiliary contact output terminal of the third intermediate relay; the output terminal of the control coil of the AC contactor and the output terminal of the second indicator light are connected together to the input terminal of the normally closed auxiliary contact of the second intermediate relay.

[0018] In a preferred embodiment, the first power supply terminal and the first fault output terminal of the control unit are connected to the output terminal of the fuse, the communication terminal of the control unit is connected to the communication terminal of the acquisition module, the overload protection terminal of the control unit is connected to the normally open contact of the thermal relay, the second fault output terminal of the control unit is connected to the coil input terminal of the second intermediate relay, and the second power supply terminal of the control unit and the coil output terminal of the second intermediate relay are connected to the center line.

[0019] In a preferred embodiment, another automatic control output terminal of the changeover switch is connected to the normally closed auxiliary contact input terminal of the AC contactor. The normally closed auxiliary contact output terminal of the AC contactor is connected to the normally closed auxiliary contact input terminal of the second intermediate relay. The normally closed auxiliary contact output terminal of the second intermediate relay is connected to the coil input terminal of the first time relay. The coil output terminal of the first time relay is connected to the center line. The normally open delay auxiliary contact output terminal of the first time relay and the normally open auxiliary contact output terminal of the third intermediate relay are combined and then connected to the input terminal of the normally closed delay auxiliary contact of the second time relay. The normally closed delay auxiliary contact output terminal of the second time relay is connected to the coil input terminal of the third intermediate relay and the coil input terminal of the second time relay, respectively. The coil output terminals of the third intermediate relay and the coil output terminals of the second time relay are connected to the center line.

[0020] In a preferred embodiment, the liquid level control module includes a control transformer, a float, and a third indicator light. The power supply terminal of the control transformer is connected to the other end of the fuse. The input terminal of the float is connected to the output terminal of the control transformer. The output terminal of the float is connected to the input terminal of the coil of the first intermediate relay. The output terminal of the coil of the first intermediate relay is connected to the other output terminal of the control transformer.

[0021] In a preferred embodiment, the system further includes: a first to a fifth temperature sensor and a humidity sensor installed inside the pump motor cavity; the first to a fifth temperature sensor are respectively connected to phase A, phase B, and phase C of the pump motor, and the upper and lower shafts of the pump; the acquisition module is installed inside the pump body cavity; the five sets of temperature acquisition terminals of the acquisition module are respectively connected to the first to a fifth sensor; and the humidity acquisition terminals of the acquisition module are connected to the humidity sensor.

[0022] In a preferred embodiment, the leakage and oil leakage detection terminals of the acquisition module are connected to the upper float, lower float, and oil chamber electrode pre-embedded in the water pump.

[0023] Compared with the prior art, the advantages of the technical solution described in this utility model are as follows:

[0024] (a) By selecting circuit breakers and fuses, the short-circuit protection function of the main circuit and control circuit of the water pump is completed.

[0025] (b) Overload protection for the pump is provided by setting the parameters of the thermal relay to avoid damage to the pump motor due to excessive current.

[0026] (c) Monitor the real-time status of the water pump and motor through RS485 communication and perform accurate diagnosis to provide reliable data for water pump control and maintenance;

[0027] (d) Automatic inspection is performed according to the set time of the time relay, which simplifies the components and wiring of the inspection control cabinet and saves costs.

[0028] The various technical features disclosed in the above-described utility model, the various technical features disclosed in the following embodiments and examples, and the various technical features disclosed in the accompanying drawings can be freely combined to form various new technical solutions (all of which should be considered as having been recorded in this specification), unless such a combination of 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. Features C and D are equivalent technical means that serve the same function, and technically only one needs to be used; it is impossible to use both simultaneously. Feature E can be technically combined with feature C. Therefore, the solution A+B+C+D should not be considered as having been recorded because it is technically infeasible, while the solution A+B+C+E should be considered as having been recorded. Attached Figure Description

[0029] Figure 1 This is an electrical schematic diagram of the primary circuit, manual control, automatic control, and communication in this utility model.

[0030] Figure 2 This is the electrical schematic diagram of the water pump temperature and humidity detection, water and oil leakage detection, and communication of this utility model.

[0031] Figure label:

[0032] QF11: Circuit breaker

[0033] FU1: Fuse

[0034] KM1: AC contactor

[0035] KH1: Thermal relay

[0036] QBP-1: Control Unit

[0037] QBP-2: Acquisition Module

[0038] KA1~KA3: First to third intermediate relays

[0039] KT1~KT2: First and second time relays

[0040] HL1~HL3: First to third indicator lights

[0041] SA1: Changeover switch

[0042] SB1~SB2: First and second buttons

[0043] T1: Control Transformer

[0044] SL1: Float Detailed Implementation

[0045] In the following description, many technical details are presented to help the reader better understand this application. However, those skilled in the art will understand that the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0046] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0047] This application relates to a WQ next-generation high-efficiency submersible sewage pump control system, such as Figure 1As shown, the system includes a power supply module, a control module, a protector, a timed inspection module, and a liquid level control module. The power supply module includes a circuit breaker QF11, an AC contactor KM1, and a thermal relay KH1. The power supply module supplies power to the water pump motor via the AC contactor KM1. The control module includes manual and automatic control components. The manual control component manually controls the on / off state of the AC contactor KM1 via buttons, while the automatic control component controls the on / off state of the AC contactor KM1 via first intermediate relay KA1, second intermediate relay KA2, and third intermediate relay KA3. Specifically, the control module includes a fuse FU1, a changeover switch SA1, a first button SB1, a second button SB2, first intermediate relay KA1, second intermediate relay KA2, third intermediate relay KA3, an optional first indicator light HL1, and an optional second indicator light HL2. The protector includes a control unit QBP-1 and a data acquisition module QBP-2. The data acquisition module QBP-2 acquires fault signals from the water pump motor. The control unit QBP-1 receives the fault signals and controls the second intermediate relay KA2 based on the overload signal transmitted by the thermal relay KH1 connected to the AC contactor KM1. The timed inspection module includes a first time relay KT1 and a second time relay KT2, and controls the on / off state of the AC contactor KM1 via a third intermediate relay KA3 to control the starting cycle and running time of the water pump motor, respectively. The liquid level control module detects the liquid level in the water tank and controls the on / off state of the AC contactor KM1 via the first intermediate relay KA1. The liquid level control module includes a control transformer T1, a float SL1, and a third indicator light HL3.

[0048] Continue to refer to Figure 1 As shown, a three-phase five-wire power supply is connected to circuit breaker QF11, and the output terminal of circuit breaker QF11 is connected to AC contactor KM1. The output terminal of AC contactor KM1 is connected to thermal relay KH1, and the output terminal of thermal relay KH1 is connected to a water pump.

[0049] The output terminal of circuit breaker QF11 is connected to fuse FU1. The other end of fuse FU1 is connected to the first indicator light HL1, the manual control input terminal of changeover switch SA1, the two automatic control input terminals of the first changeover switch SA1, the power supply terminal of control unit QBP-1, the normally open delay contact of the first time relay KT1, the normally open contact of the third intermediate relay KA3, and the power supply terminal of control transformer T1. The other end of the first indicator light HL1 is connected to the center line N.

[0050] The manual control output terminal of the changeover switch SA1 is connected to the input terminal of the first button SB1. The output terminal of the first button SB1 is connected to the input terminal of the second button SB2 and the normally open auxiliary contact input terminal of the AC contactor KM1. One of the automatic control output terminals of the changeover switch SA1 is connected to the normally open auxiliary contact input terminal of the first intermediate relay KA1 and the normally open auxiliary contact input terminal of the third intermediate relay KA3. The output terminals of the second button SB2, the normally open auxiliary contact output terminals of the AC contactor KM1, the normally open auxiliary contact output terminals of the first intermediate relay KA1 and the normally open auxiliary contact output terminals of the third intermediate relay KA3 are then connected to the control coil input terminal of the AC contactor KM1 and the input terminal of the second indicator light HL2. The output terminals of the control coil output terminal of the AC contactor KM1 and the output terminal of the second indicator light HL2 are then connected to the normally closed auxiliary contact input terminal of the second intermediate relay KA2. The normally closed auxiliary contact output terminal of the second intermediate relay KA2 is connected to the center line N.

[0051] The first power supply terminal (L) and the first fault output terminal (ZO) of control unit QBP-1 are connected to the output terminals of fuse FU1. The communication terminals (A+, B-) of control unit QBP-1 are connected to the communication terminals of acquisition module QBP-2. Figure 2 In the middle (A+, B-), the overload protection terminal (COM) of the control unit QBP-1 is connected to the normally open contact of the thermal relay KH1, the second fault output terminal (ZO) of the control unit QBP-1 is connected to the coil input terminal of the second intermediate relay KA2, and the second power supply terminal (N) of the control unit QBP-1 and the coil output terminal of the second intermediate relay KA2 are connected to the center line N.

[0052] Another automatic control output terminal of the changeover switch SA1 is connected to the normally closed auxiliary contact input terminal of the AC contactor KM1. The normally closed auxiliary contact output terminal of the AC contactor KM1 is connected to the normally closed auxiliary contact input terminal of the second intermediate relay KA2. The normally closed auxiliary contact output terminal of the second intermediate relay KA2 is connected to the coil input terminal of the first time relay KT1. The coil output terminal of the first time relay KT1 is connected to the center line N.

[0053] The output terminals of the normally open delayed auxiliary contact of the first time relay KT1 and the normally open auxiliary contact of the third intermediate relay KA3 are connected to the input terminal of the normally closed delayed auxiliary contact of the second time relay KT2. The output terminal of the normally closed delayed auxiliary contact of the second time relay KT2 is connected to the input terminals of the coils of the third intermediate relay KA3, the second time relay KT2, and the third indicator light HL3, respectively. The output terminals of the coils of the third intermediate relay KA3, the second time relay KT2, and the third indicator light HL3 are connected to the center line N.

[0054] The input terminal of float SL1 is connected to the output terminal of control transformer T1, and the output terminal of float SL1 is connected to the input terminal of the coil of the first intermediate relay KA1. The output terminal of the coil of the first intermediate relay KA1 is connected to the other output terminal of control transformer T1. Control transformer T1 converts 220V AC power to a safe voltage, such as 36V. Float SL1 is installed in the water tank and can be used to detect the water level.

[0055] It should be understood that the terms "input terminal" and "output terminal" refer to a pair of wires connected to a corresponding component or its contacts. Connecting the input terminal and the output terminal indicates that the component is energized. For example, connecting the manual control output terminal and the manual control output terminal of the changeover switch SA1 indicates that the manual control contact is energized. Connecting the control coil input terminal and the control coil input terminal of the AC contactor KM1 indicates that the control coil is energized.

[0056] The control system also includes first to fifth temperature sensors (e.g., PT100 sensors) and a humidity sensor installed inside the pump motor cavity. Figure 2 As shown, the five sets of temperature acquisition terminals on the QBP-2 acquisition module are connected to the pre-embedded PT100 sensors of phases A, B, and C of the water pump motor, as well as the pre-embedded PT100 sensors on the upper and lower shafts of the water pump. The humidity acquisition terminals on the QBP-2 acquisition module are connected to the humidity sensor inside the water pump motor cavity; the water leakage and oil leakage acquisition terminals on the QBP-2 acquisition module are connected to the pre-embedded upper and lower floats and the oil chamber electrode of the water pump. The RS485 communication terminal on the QBP-2 acquisition module is connected to the RS485 communication terminal on the control unit QBP-1, and can also be externally connected to a higher-level system. The power supply for the QBP-2 acquisition module is provided by the secondary control circuit of the water pump control cabinet. It should be understood that the QBP-2 acquisition module is located inside the water pump motor cavity, and only the two RS485 communication terminals, power supply terminals 28 and 29, and the grounding terminal PE need to be externally connected, thus greatly reducing the number of external wiring.

[0057] The operation steps of the control system of this utility model are as follows:

[0058] (a) First, close the circuit breaker QF11 and fuse FU1 in the control cabinet. The indicator light HL1 will light up, indicating that the power is on.

[0059] (b) Set the parameters of thermal relay KH1, time relays KT1~KT2, intermediate relays KA1~KA3, etc., and put them in the power-on standby state.

[0060] (c) Manual / automatic mode can be selected by changing switch SA1 to achieve manual or automatic control.

[0061] (d) In manual mode, the water pump can be started via button SB1 and stopped manually via button SB2. With the manual contact of changeover switch SA1 open, pressing button SB1 energizes button SB2 and the control coil of AC contactor KM1, closing the normally open auxiliary contact of AC contactor KM1. The water pump motor is energized, the water pump starts running, and indicator light HL2 illuminates, indicating that the water pump motor is running in manual mode.

[0062] (e) If the system is in automatic mode, the two pairs of automatic contacts of the changeover switch SA1 will be turned on, and the inspection function will be started according to the set inspection cycle. The equipment will perform timed inspections of the water pump and control the start and stop of the water pump according to the liquid level feedback of the float.

[0063] When time relay KT1 is energized, it begins timing. Upon reaching its preset time parameter, the normally open delayed auxiliary contact of time relay KT1 conducts, energizing the coil of intermediate relay KA3. The normally open contact of intermediate relay KA3 then conducts, energizing the coil of AC contactor KM1, which in turn energizes the water pump motor, causing the water pump to start running. When the coil of time relay KT2 is energized, it begins timing. Upon reaching its preset time parameter, the normally closed delayed auxiliary contact of time relay KT2 opens, de-energizing time relay KA3. Consequently, AC contactor KM1 de-energizes, the water pump motor de-energizes, and the water pump stops working. During water pump operation, indicator light HL3 illuminates, indicating the water pump's inspection and operation status.

[0064] When the water level is high, the normally open contact of float SL1 closes, energizing the coil of intermediate relay KA1. This causes the normally open contact of intermediate relay KA1 to conduct, energizing the coil of AC contactor KM1, which in turn energizes the water pump motor, causing the water pump to start. When the water level is low, the normally open contact of float SL1 opens, de-energizing intermediate relay KA1, which in turn de-energizes AC contactor KM1, de-energizing the water pump motor, and stopping the water pump. During pump operation, indicator light HL2 illuminates to indicate the pump's operating status.

[0065] (f) The system monitors the status of the water pump in real time via RS485 communication. When an abnormality is detected, the system will stop the operation of the water pump in a timely manner through the control loop to avoid adverse consequences on the water pump and equipment system.

[0066] When the control unit QBP-1 receives a fault signal from the acquisition module QBP-2 (for example, when the corresponding pre-embedded PT100 sensor detects that the temperature exceeds the threshold, or the humidity exceeds the threshold, or the upper float or lower float detects a water leakage signal, or the oil chamber electrode detects an oil leakage signal) or an overload signal from the thermal relay KH1, the control unit QBP-1 controls the coil of the intermediate relay KA2 to de-energize, which in turn de-energizes the AC contactor KM1 and the water pump motor.

[0067] An embodiment of this application also discloses a submersible sewage pump control method, the control method comprising the following steps:

[0068] First, set the parameters for thermal relay KH1, first intermediate relay KA1, second intermediate relay KA2, third intermediate relay KA3, first time relay KT1, and second time relay KT2.

[0069] Secondly, the manual mode is selected through the manual control component, and the AC contactor KM1 is manually switched on and off via the button.

[0070] Secondly, the automatic mode is selected via the automatic control component. Specifically:

[0071] When the control unit QBP-1 receives a fault signal or overload signal, it controls the AC contactor KM1 to disconnect through the second intermediate relay KA2.

[0072] When the time parameter of the first time relay KT1 is met, the AC contactor KM1 is turned on by the third intermediate relay KA3 to control the starting cycle of the water pump motor; when the time parameter of the second time relay KT2 is met, the AC contactor KM1 is turned off by the third intermediate relay KA3 to control the running time of the water pump motor after it starts.

[0073] When the liquid level control module detects that the liquid level meets the conditions, it controls the AC contactor KM1 to disconnect through the first intermediate relay KA1.

[0074] It should be noted that the technical details described in the aforementioned embodiments of the submersible sewage pump control system can be applied to this embodiment, and will not be repeated here.

[0075] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. In this application, if it refers to performing an action according to an element, it means performing the action at least according to that element, including two cases: performing the action only according to that element, and performing the action according to that element and other elements. Expressions such as "multiple," "repeatedly," and "various" include two, two times, two kinds, and more than two, more than two times, and more than two kinds.

[0076] This specification includes combinations of various embodiments described herein. Individual references to embodiments are made (e.g., "one embodiment," "some embodiments," or "preferred embodiments"); however, these embodiments are not mutually exclusive unless indicated to be mutually exclusive or are readily apparent to those skilled in the art. It should be noted that the word "or" is used in a non-exclusive sense throughout this specification unless the context explicitly indicates or requires it.

[0077] All references to this specification are considered to be incorporated integrally into the disclosure of this application so that they can serve as the basis for modifications if necessary. Furthermore, it should be understood that the above descriptions are merely preferred embodiments of this specification and are not intended to limit the scope of protection of this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification should be included within the scope of protection of one or more embodiments of this specification.

[0078] In some cases, the actions or steps described in the claims can be performed in a different order than that shown in the embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

Claims

1. A submersible sewage pump control system, characterized in that, include: A power supply module, which supplies power to the water pump motor via an AC contactor (KM1); The control module includes a manual control component and an automatic control component. The manual control component manually controls the switching on and off of the AC contactor (KM1) via a button, and the automatic control component controls the switching on and off of the AC contactor (KM1) via a first intermediate relay (KA1), a second intermediate relay (KA2), and a third intermediate relay (KA3). The protector includes a control unit (QBP-1) and a data acquisition module (QBP-2). The data acquisition module (QBP-2) is used to acquire the fault signal of the water pump motor. The control unit (QBP-1) receives the fault signal and controls the second intermediate relay (KA2) according to the overload signal transmitted by the thermal relay (KH1) connected to the AC contactor (KM1). The timed inspection module includes a first time relay (KT1) and a second time relay (KT2), ​​and controls the on / off state of the AC contactor (KM1) through the third intermediate relay (KA3) to control the start-up cycle and running time of the water pump motor respectively. A liquid level control module is used to detect the liquid level in the water tank and control the switching on and off of the AC contactor (KM1) via the first intermediate relay (KA1).

2. The submersible sewage pump control system as described in claim 1, characterized in that, The power supply module includes a circuit breaker (QF11), an AC contactor (KM1), and a thermal relay (KH1). A three-phase five-wire power supply is connected to the circuit breaker (QF11), the output terminal of the circuit breaker (QF11) is connected to the AC contactor (KM1), the output terminal of the AC contactor (KM1) is connected to the thermal relay (KH1), and the output terminal of the thermal relay (KH1) is connected to the water pump motor.

3. The submersible sewage pump control system as described in claim 2, characterized in that, The control module includes a fuse (FU1), a changeover switch (SA1), a first button (SB1), a second button (SB2), a first intermediate relay (KA1), a second intermediate relay (KA2), and a third intermediate relay (KA3). The output terminal of the circuit breaker (QF11) is connected to one end of the fuse (FU1). The other end of the fuse (FU1) is connected to the manual control input terminal of the changeover switch (SA1), the two automatic control input terminals of the changeover switch (SA1), the power supply terminal of the control unit (QBP-1), the normally open delay contact of the first time relay (KT1), and the normally open contact of the third intermediate relay (KA3). The manual control output terminal of the changeover switch (SA1) is connected to the input terminal of the first button (SB1), and the output terminal of the first button (SB1) is connected to the second button. The input terminal of (SB2), the normally open auxiliary contact input terminal of the AC contactor (KM1), and one automatic control output terminal of the changeover switch (SA1) are respectively connected to the normally open auxiliary contact input terminal of the first intermediate relay (KA1) and the normally open auxiliary contact input terminal of the third intermediate relay (KA3); the output terminal of the second button (SB2), the normally open auxiliary contact output terminal of the AC contactor (KM1), the normally open auxiliary contact output terminal of the first intermediate relay (KA1), and the normally open auxiliary contact output terminal of the third intermediate relay (KA3) are connected together and then respectively connected to the control coil input terminal of the AC contactor (KM1). The control coil output terminal of the AC contactor (KM1) is connected to the normally closed auxiliary contact input terminal of the second intermediate relay (KA2), and the normally closed auxiliary contact output terminal of the second intermediate relay (KA2) is connected to the center line (N).

4. The submersible sewage pump control system as described in claim 3, characterized in that, The control module further includes: a first indicator light (HL1), one end of which is connected to the other end of the fuse (FU1), and the other end of which is connected to the center line (N).

5. The submersible sewage pump control system as described in claim 3, characterized in that, The control module further includes: a second indicator light (HL2), the input terminal of which is connected to the output terminal of the second button (SB2), the normally open auxiliary contact output terminal of the AC contactor (KM1), the normally open auxiliary contact output terminal of the first intermediate relay (KA1), and the normally open auxiliary contact output terminal of the third intermediate relay (KA3). The control coil output terminal of the AC contactor (KM1) and the output terminal of the second indicator light (HL2) are connected together to the normally closed auxiliary contact input terminal of the second intermediate relay (KA2).

6. The submersible sewage pump control system as described in claim 3, characterized in that, The first power supply terminal and the first fault output terminal of the control unit (QBP-1) are connected to the output terminal of the fuse (FU1). The communication terminal of the control unit (QBP-1) is connected to the communication terminal of the acquisition module (QBP-2). The overload protection terminal of the control unit (QBP-1) is connected to the normally open contact of the thermal relay (KH1). The second fault output terminal of the control unit (QBP-1) is connected to the coil input terminal of the second intermediate relay (KA2). The second power supply terminal of the control unit (QBP-1) and the coil output terminal of the second intermediate relay (KA2) are connected to the center line (N).

7. The submersible sewage pump control system as described in claim 3, characterized in that, The other automatic control output terminal of the changeover switch (SA1) is connected to the normally closed auxiliary contact input terminal of the AC contactor (KM1). The normally closed auxiliary contact output terminal of the AC contactor (KM1) is connected to the normally closed auxiliary contact input terminal of the second intermediate relay (KA2). The normally closed auxiliary contact output terminal of the second intermediate relay (KA2) is connected to the coil input terminal of the first time relay (KT1). The coil output terminal of the first time relay (KT1) is connected to the center line (N). The normally open delay of the first time relay (KT1)... The output terminal of the auxiliary contact and the output terminal of the normally open auxiliary contact of the third intermediate relay (KA3) are connected to the input terminal of the normally closed delay auxiliary contact of the second time relay (KT2). The output terminal of the normally closed delay auxiliary contact of the second time relay (KT2) is connected to the input terminal of the coil of the third intermediate relay (KA3) and the input terminal of the coil of the second time relay (KT2), ​​respectively. The output terminals of the coils of the third intermediate relay (KA3) and the second time relay (KT2) are connected to the center line (N).

8. The submersible sewage pump control system as described in claim 3, characterized in that, The liquid level control module includes a control transformer (T1), a float (SL1), and a third indicator light (HL3). The power supply terminal of the control transformer (T1) is connected to the other end of the fuse (FU1). The input terminal of the float (SL1) is connected to the output terminal of the control transformer (T1). The output terminal of the float (SL1) is connected to the input terminal of the coil of the first intermediate relay (KA1). The output terminal of the coil of the first intermediate relay (KA1) is connected to the other output terminal of the control transformer (T1).

9. The submersible sewage pump control system as described in claim 1, characterized in that, Also includes: The first to fifth temperature sensors and the humidity sensor are installed inside the water pump motor cavity. The first to fifth temperature sensors are respectively connected to phase A, phase B, and phase C of the water pump motor, as well as the upper and lower shafts of the water pump. The acquisition module (QBP-2) is installed inside the water pump body cavity. The five sets of temperature acquisition terminals of the acquisition module (QBP-2) are respectively connected to the first to fifth sensors, and the humidity acquisition terminals of the acquisition module (QBP-2) are connected to the humidity sensor.

10. The submersible sewage pump control system as described in claim 1, characterized in that, The leakage and oil leakage acquisition terminals of the acquisition module (QBP-2) are connected to the upper and lower floats and the oil chamber electrode pre-embedded in the water pump.

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