Water level control method of submersible pump and control method of submersible pump

Abstract

The invention relates to the technical field of submersible pumps, in particular to a submersible pump water level control method and a submersible pump control method.If a liquid level sensor is an electrode sensor, the submersible pump water level control method comprises the following steps that S1, after the submersible pump is powered on, a first liquid level sensor outputs a first signal value A to a controller, if the first signal value A is smaller than or equal to the preset value K1, the value A is recorded, meanwhile, the controller executes a starting program, and the submersible pump is started; if the first signal value A is larger than the preset value K1, the controller does not execute the starting program, and the submersible pump is not started; s2, after the submersible pump is started, the first liquid level sensor or the second liquid level sensor outputs a second signal value B to the controller, if the second signal value B is larger than nA (n is larger than 1, and the value of n can be set), the controller executes the closing program, and the submersible pump is closed; and if the second signal value B is smaller than or equal to nA, the controller does not execute the closing program, and the submersible pump is still in the starting state.

Description

Technical Field

[0001] The present disclosure relates to the technical field of submersible pumps, and in particular to a water level control method for a submersible pump and a control method for a submersible pump. Background Art

[0002] Submersible pump is a widely used water treatment tool. Its working principle is: before the submersible pump is turned on, the suction pipe and the pump must be filled with liquid. After the pump is turned on, the impeller rotates at high speed, and the liquid in the submersible pump rotates with the blades. Under the action of centrifugal force, the liquid flies away from the impeller and ejects outward. The ejected liquid gradually slows down in the diffusion chamber of the pump casing, and the pressure gradually increases, and then flows out from the pump outlet and the discharge pipe. At this time, a vacuum low-pressure area with neither air nor liquid is formed at the center of the blades because the liquid is thrown to the surroundings. Under the action of the atmospheric pressure on the surface of the pool, the liquid in the liquid pool flows into the submersible pump through the suction pipe. In this way, the liquid is continuously sucked up from the liquid pool and continuously flows out from the discharge pipe.

[0003] Since the submersible pump is used by submerging the entire pump into the water, an automatic switch is generally used to control the switch of the submersible pump by detecting the water level. When the water level drops to a certain lower limit, it automatically shuts down. The control module of the submersible pump is set with a preset value K. At present, the conventional water level control method is (logic diagram as shown in Figure 1 As shown), when the water level reaches the first water level sensor, the first water level sensor outputs a first signal to the signal processing module, and the signal processing module compares the value of the first signal with K. If it is less than K, the control module controls the submersible pump to start; when the water level leaves the second water level sensor while dropping, the second water level sensor outputs a second signal to the signal processing module, and the signal processing module compares the value of the second signal with K. If it is greater than K, the control module controls the submersible pump to shut down. Usually, the first signal value and the second signal value are both resistance values. When the water is relatively pure, in order to start the water pump smoothly, the value of K is usually set to be relatively large, but this may cause the value of the second signal to be less than the value of K. In this way, the water level control will fail and the submersible pump cannot stop running automatically. Summary of the invention

[0004] In view of the deficiencies and existing problems in the prior art, the present disclosure provides a water level control method for a submersible pump, which can better realize the start-up and shutdown of the submersible pump.

[0005] The technical solution adopted by the present disclosure to solve the above technical problems is: a water level control method for a submersible pump,

[0006] If the liquid level sensor is an electrode sensor, the steps include:

[0007] S1. After the submersible pump is powered on, the first liquid level sensor outputs the first signal value A to the controller. If the first signal value A is less than or equal to the preset value K1, the A value is recorded, and the controller executes the startup procedure and the submersible pump starts; if the first signal value A is greater than the preset value K1, the controller does not execute the startup procedure and the submersible pump does not start;

[0008] S2. After the submersible pump is started, the first liquid level sensor or the second liquid level sensor outputs a second signal value B to the controller. If the second signal value B is greater than nA, and n is greater than 1, the controller executes a shutdown procedure and the submersible pump is shut down; if the second signal value B is less than or equal to nA, the controller does not execute a shutdown procedure and the submersible pump remains in the started state;

[0009] If the liquid level sensor is a capacitive sensor, the following steps are included:

[0010] S1. After the submersible pump is powered on, the first liquid level sensor outputs the first signal value A to the controller. If the first signal value A is greater than or equal to the preset value K2, the A value is recorded, and the controller executes the startup procedure to start the submersible pump; if the first signal value A is less than the preset value K2, the controller does not execute the startup procedure and the submersible pump does not start;

[0011] S2. After the submersible pump is started, the first liquid level sensor or the second liquid level sensor outputs a second signal value B to the controller. If the second signal value B is less than or equal to nA, n is greater than 0, and n is less than 1, the controller executes the shutdown procedure and the submersible pump is shut down; if the second signal value B is greater than nA, the controller does not execute the shutdown procedure and the submersible pump remains in the started state.

[0012] As a preferred embodiment, the submersible pump further includes a selection module, and the selection module includes a single sensor mode and a dual sensor mode. In the single sensor mode, the first signal value A and the second signal value B are both output by the first liquid level sensor; in the dual sensor mode, the first liquid level sensor and the second liquid level sensor both work, the first signal value A is output by the first liquid level sensor, and the second signal value B is output by the second liquid level sensor.

[0013] As a preferred embodiment, the first liquid level sensor in S1 outputs a first signal value A to the information processing module of the controller, and the information processing module compares the first signal value A with a preset value K1 or K2. When the first liquid level sensor is an electrode sensor, if the first signal value A is less than or equal to the preset value K1, the A value is recorded and the controller executes a startup procedure; when the first liquid level sensor is a capacitive sensor, if the first signal value is greater than or equal to the preset value K2, the A value is recorded and the controller executes a startup procedure.

[0014] As a preferred embodiment, the startup procedure is: when the first liquid level sensor is an electrode sensor, after the information processing module confirms that the first signal value A is less than or equal to the preset value K1, it outputs a third signal to the control module, and the control module starts the motor; when the first liquid level sensor is a capacitive sensor, after the information processing module confirms that the first signal value A is greater than or equal to the preset value K2, it outputs a third signal to the control module, and the control module starts the motor.

[0015] As a preferred embodiment, the third signal is a feedback signal after the information processing module processes the first signal value A, which is used to control the control module to start the motor; the processing here refers to comparing the first signal value A with the preset value K1 or K2.

[0016] As a preferred embodiment, in S2, the first liquid level sensor or the second liquid level sensor outputs a second signal value B to the information processing module of the controller, and the information processing module compares the second signal value B with nA. When the first liquid level sensor is an electrode sensor, if the second signal value B is greater than nA, the controller executes a shutdown procedure; when the first liquid level sensor is a capacitive sensor, if the second signal value B is less than or equal to nA, the controller executes a shutdown procedure.

[0017] As a preferred embodiment, the shutdown procedure is: when the first liquid level sensor is an electrode sensor, after the information processing module confirms that the second signal value B is greater than nA, it outputs a fourth signal to the control module, and the control module stops the motor; when the first liquid level sensor is a capacitive sensor, after the information processing module confirms that the second signal value B is less than or equal to nA, it outputs a fourth signal to the control module, and the control module stops the motor.

[0018] As a preferred implementation, the fourth signal is a feedback signal after the information processing module processes the second signal value B, and is used to control the control module to stop the motor; the processing here refers to comparing the second signal value B with nA.

[0019] Compared with the prior art, due to the adoption of the above steps, the first signal value A output by the first liquid level sensor is compared with the preset value K1 or K2, and the preset value K1 or K2 can be set at the factory according to the actual application environment of the submersible pump, such as: if the submersible pump is used for pumping water, the preset value K1 is set to be roughly equal to the resistance value of pure water or air. Since the water in daily life and production is doped with impurities, the first signal value A is often smaller than the preset value K1, and the submersible pump can be started normally at this time. K2 is the capacitance value of air, and the capacitance value of air is so small that it can be ignored. The capacitance value of water in daily life and production is often greater than the capacitance value of air, and the submersible pump can be started normally; after the submersible pump is started, the first liquid level sensor or the second liquid level sensor outputs the second signal value B, and compares the signal value B with nA, and the value of n can be set according to the actual situation, which avoids the automatic shutdown of the submersible pump due to the large K value; since the preset value K1 or K2 can be set at the factory according to the actual application environment of the submersible pump, the submersible pump has a wider range of applications.

[0020] Another object of the present disclosure is to provide a control method for a submersible pump, comprising the following steps:

[0021] A pulse power supply is provided in the controller, and the pulse power supply is used for connecting the first liquid level sensor and the common end sensor.

[0022] Compared with the prior art, since a pulse power supply is provided in the controller, the pulse power supply is used for connecting the first liquid level sensor and the common end sensor, so that the positive and negative poles between the first liquid level sensor and the common end sensor can be continuously converted, thereby ensuring that the common end sensor and the first liquid level sensor have an electronic balance and avoid electrochemical corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present application will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present application. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0024] Figure 1 It is a water level control logic diagram of a submersible pump in the prior art;

[0025] Figure 2 is a control logic diagram of the water level control method in Embodiment 1 of the present disclosure;

[0026] Figure 3 is a control logic diagram of the water level control method in Embodiment 2 of the present disclosure;

[0027] Figure 4 is a control logic diagram of the water level control method in Embodiment 3 of the present disclosure;

[0028] Figure 5 It is a control logic diagram of the water level control method in Example 4 of the present disclosure. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is described in detail, clearly and completely in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not used to limit the present disclosure.

[0030] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0031] The submersible pump includes a pump body, and a liquid level sensor and a common end sensor are arranged on the side of the pump body. According to the different heights of the arrangement positions, the liquid level sensor includes a first liquid level sensor and a second liquid level sensor. The first liquid level sensor, the second liquid level sensor and the common end sensor are all electrically connected to the controller. The first liquid level sensor is arranged above the second liquid level sensor. The controller includes an information processing module and a control module. The information processing module is electrically connected to the control module. The information processing module is electrically connected to the first liquid level sensor and the second liquid level sensor. A motor is arranged in the pump body, and the motor is electrically connected to the control module. The control module is used to control the start or stop of the motor. The controller is also connected to a selection module for selecting a single sensor mode or a dual sensor mode.

[0032] Example 1

[0033] This embodiment is a dual sensor mode, please refer to Figure 2 As shown, a water level control method for a submersible pump, when the first liquid level sensor and the second liquid level sensor are electrode sensors, comprises the following steps:

[0034] S1. After the submersible pump is powered on, the first liquid level sensor outputs the first signal value A to the information processing module of the controller. The information processing module compares the first signal value A with the preset value K1. If the first signal value A is less than or equal to the preset value K1, the A value is recorded. At the same time, the information processing module outputs a third signal to the control module. The control module starts the motor to start the submersible pump. If the first signal value A is greater than the preset value K1, the controller does not execute the startup procedure and the submersible pump does not start.

[0035] S2. After the submersible pump is started, the second liquid level sensor outputs a second signal value B to the information processing module of the controller. The information processing module compares the second signal value B with nA, where A is the signal value collected at the last startup. If the second signal value B is greater than nA (n is greater than 1, and the value of n is factory preset - set according to the error value of the circuit board detection system), the information processing module outputs a fourth signal to the control module, and the control module stops the motor to stop the submersible pump; if the second signal value B is less than or equal to nA, the controller does not execute the shutdown procedure, and the submersible pump remains in the started state.

[0036] It should be noted that the preset value K1 in this embodiment can be set at the factory according to the actual application environment of the submersible pump. In most cases, the submersible pump is used in water. If the submersible pump is used to pump water, the preset value K1 is set to the resistance value of pure water or air. The first signal value A and the second signal value B in this embodiment are both resistance values.

[0037] After the submersible pump starts working, the liquid level in the liquid pool drops to the first preset water level line, and the second liquid level sensor outputs the second signal value B to the information processing module of the controller. The information processing module compares the second signal value B with nA. If the second signal value B is greater than nA, the submersible pump can be stopped. In the prior art, the second signal value B is compared with the K1 value. When the water is relatively pure, the preset value K1 is often relatively large, which may cause the value of B to be less than or equal to K1, so that the motor cannot be automatically shut down. After adopting the above steps, the first signal value A output by the first liquid level sensor is compared with the preset value K1, and the preset value K1 can be set at the factory according to the actual application environment of the submersible pump. For example, if the submersible pump is used to pump water, the preset value K1 is set to be roughly equal to the resistance value of pure water or air. Since the water in life and production is doped with impurities, the first signal value A is often smaller than the preset value K1, and the submersible pump can start normally at this time; after the submersible pump is started, the second liquid level sensor outputs the second signal value B, and compares the signal value B with nA, and the value of n can be set according to the actual situation, which avoids the automatic shutdown of the submersible pump due to the large K1 value; since the preset value K1 can be set at the factory according to the actual application environment of the submersible pump, the submersible pump has a wider range of applications.

[0038] It should be noted that the third signal is a feedback signal after the information processing module processes the first signal value A, and is used to control the control module to start the motor; the processing here refers to comparing the first signal value A with the preset value K1.

[0039] The fourth signal is a feedback signal after the information processing module processes the second signal value B, and is used to control the control module to stop the motor; the processing here refers to comparing the second signal value B with the size of nA.

[0040] After the submersible pump is turned off, when the liquid level rises to the second preset water level line, steps S1-S2 are cycled.

[0041] Example 2

[0042] This embodiment is a dual sensor mode, please refer to Figure 3 As shown, a water level control method for a submersible pump, when the first liquid level sensor and the second liquid level sensor are capacitive sensors, comprises the following steps:

[0043] S1. After the submersible pump is powered on, the first liquid level sensor outputs the first signal value A to the information processing module of the controller. The information processing module compares the first signal value A with the preset value K2. If the first signal value A is greater than or equal to the preset value K2, the A value is recorded. At the same time, the information processing module outputs a third signal to the control module. The control module starts the motor to start the submersible pump. If the first signal value A is less than the preset value K2, the controller does not execute the startup procedure and the submersible pump does not start.

[0044] S2. After the submersible pump is started, the second liquid level sensor outputs a second signal value B to the information processing module of the controller. The information processing module compares the second signal value B with nA, where A is the signal value collected at the last startup. If the second signal value B is less than or equal to nA (0<n<1, and the value of n is factory preset - set according to the error value of the circuit board detection system), the information processing module outputs a fourth signal to the control module, and the control module stops the motor to stop the submersible pump; if the second signal value B is greater than nA, the controller does not execute the shutdown procedure, and the submersible pump remains in the started state.

[0045] It should be noted that the preset value K2 in this embodiment can be set at the factory according to the actual application environment of the submersible pump. In most cases, the submersible pump is used in water. If the submersible pump is used to pump water, the preset value K2 is set to the capacitance value of air. The first signal value A and the second signal value B in this embodiment are both capacitance values.

[0046] It should be noted that the third signal is a feedback signal after the information processing module processes the first signal value A, and is used to control the control module to start the motor; the processing here refers to comparing the first signal value A with the preset value K2.

[0047] The fourth signal is a feedback signal after the information processing module processes the second signal value B, and is used to control the control module to stop the motor; the processing here refers to comparing the second signal value B with the size of nA.

[0048] It should be noted that whether the first liquid level sensor and the second liquid level sensor are configured as electrode sensors or capacitive sensors is set at the factory, and the manufacturer sets it according to customer needs.

[0049] Example 3

[0050] This embodiment is a single sensor mode, and the first liquid level sensor is an electrode sensor. Figure 4 As shown, a water level control method for a submersible pump comprises the following steps:

[0051] S1. After the submersible pump is powered on, the first liquid level sensor outputs the first signal value A to the information processing module of the controller. The information processing module compares the first signal value A with the preset value K1. If the first signal value A is less than or equal to the preset value K1, the A value is recorded. At the same time, the information processing module outputs a third signal to the control module. The control module starts the motor to start the submersible pump. If the first signal value A is greater than the preset value K1, the controller does not execute the startup procedure and the submersible pump does not start.

[0052] S2. After the submersible pump is started, the first liquid level sensor outputs a second signal value B to the information processing module of the controller. The information processing module compares the second signal value B with nA, where A is the signal value collected at the last startup. If the second signal value B is greater than nA (n is greater than 1, and the value of n is factory preset - set according to the error value of the circuit board detection system), the information processing module outputs a fourth signal to the control module, and the control module stops the motor to stop the submersible pump; if the second signal value B is less than or equal to nA, the controller does not execute the shutdown procedure, and the submersible pump remains in the started state.

[0053] In this embodiment, the first signal value A and the second signal value B are both output by the first liquid level sensor. After the submersible pump starts working, the liquid level in the liquid pool drops to the first preset water level line, and the first liquid level sensor outputs the second signal value B to the information processing module of the controller. The information processing module compares the second signal value B with nA. If the second signal value B is greater than nA, the submersible pump can stop working.

[0054] The preset value K1 is set to the resistance value of pure water or air; in this embodiment, the first signal value A and the second signal value B are both resistance values.

[0055] It should be noted that the submersible pump may also be provided with only one liquid level sensor, in which case there is no need to provide a selection module.

[0056] Example 4

[0057] This embodiment is a single sensor mode, and the first liquid level sensor is a capacitive sensor. Figure 5 As shown, a water level control method for a submersible pump comprises the following steps:

[0058] S1. After the submersible pump is powered on, the first liquid level sensor outputs the first signal value A to the information processing module of the controller. The information processing module compares the first signal value A with the preset value K2. If the first signal value A is greater than or equal to the preset value K2, the A value is recorded. At the same time, the information processing module outputs a third signal to the control module. The control module starts the motor to start the submersible pump. If the first signal value A is less than the preset value K2, the controller does not execute the startup procedure and the submersible pump does not start.

[0059] S2. After the submersible pump is started, the first liquid level sensor outputs a second signal value B to the information processing module of the controller. The information processing module compares the second signal value B with nA, where A is the signal value collected at the last startup. If the second signal value B is less than or equal to nA (0<n<1, and the value of n is factory preset - set according to the error value of the circuit board detection system), the information processing module outputs a fourth signal to the control module, and the control module stops the motor to stop the submersible pump; if the second signal value B is greater than nA, the controller does not execute the shutdown procedure, and the submersible pump remains in the started state.

[0060] In this embodiment, the first signal value A and the second signal value B are both output by the first liquid level sensor. After the submersible pump starts working, the liquid level in the liquid pool drops to the first preset water level line, and the first liquid level sensor outputs the second signal value B to the information processing module of the controller. The information processing module compares the second signal value B with nA. If the second signal value B is greater than nA, the submersible pump can stop working.

[0061] The preset value K2 is set to the capacitance value of air; in this embodiment, the first signal value A and the second signal value B are both capacitance values.

[0062] It should be noted that the submersible pump may also be provided with only one liquid level sensor, in which case there is no need to provide a selection module.

[0063] Example 5

[0064] When the first liquid level sensor is working, it will be connected to the common end sensor, and a path will be formed between the two, and a weak current will be formed between the first liquid level sensor and the common end sensor. If the first liquid level sensor is the positive electrode and the common end sensor is the negative electrode, the common end sensor will lose electrons and undergo an oxidation reaction. The common end sensor will continuously give electrons to the first liquid level sensor, which will cause severe electrochemical corrosion of the common end sensor in the long run. On the contrary, if the common end sensor is the positive electrode and the first liquid level sensor is the negative electrode, it will cause severe electrochemical corrosion of the first liquid level sensor.

[0065] To this end, the present application provides a control method for a submersible pump, comprising the following steps:

[0066] A pulse power supply is provided in the controller, and the pulse power supply is used for connecting the first liquid level sensor and the common end sensor, so that the common end sensor and the first liquid level sensor can be electronically balanced to avoid electrochemical corrosion.

[0067] It should be noted that the specific structure and function of the common end sensor in the present application are the same as those in the prior art.

[0068] The present application is described in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A water level control method for a submersible pump, characterized in that: If the liquid level sensor is an electrode sensor, the steps include: S1. After the submersible pump is powered on, the first liquid level sensor outputs the first signal value A to the controller. If the first signal value A is less than or equal to the preset value K1, the A value is recorded, and the controller executes the startup procedure and the submersible pump starts; if the first signal value A is greater than the preset value K1, the controller does not execute the startup procedure and the submersible pump does not start; S2. After the submersible pump is started, the first liquid level sensor or the second liquid level sensor outputs a second signal value B to the controller. If the second signal value B is greater than nA, and n is greater than 1, the controller executes a shutdown procedure and the submersible pump is shut down; if the second signal value B is less than or equal to nA, the controller does not execute a shutdown procedure and the submersible pump remains in the started state; If the liquid level sensor is a capacitive sensor, the following steps are included: S1. After the submersible pump is powered on, the first liquid level sensor outputs the first signal value A to the controller. If the first signal value A is greater than or equal to the preset value K2, the A value is recorded, and the controller executes the startup procedure to start the submersible pump; if the first signal value A is less than the preset value K2, the controller does not execute the startup procedure and the submersible pump does not start; S2. After the submersible pump is started, the first liquid level sensor or the second liquid level sensor outputs a second signal value B to the controller. If the second signal value B is less than or equal to nA, n is greater than 0, and n is less than 1, the controller executes the shutdown procedure and the submersible pump is shut down; if the second signal value B is greater than nA, the controller does not execute the shutdown procedure and the submersible pump remains in the started state.

2. The water level control method of a submersible pump according to claim 1, characterized in that: The submersible pump further includes a selection module, wherein the selection module includes a single sensor mode and a dual sensor mode.

3. The water level control method of a submersible pump according to claim 1, characterized in that: In S1, the first liquid level sensor outputs a first signal value A to the information processing module of the controller, and the information processing module compares the first signal value A with a preset value K1 or K2. When the first liquid level sensor is an electrode sensor, if the first signal value A is less than or equal to the preset value K1, the A value is recorded and the controller executes a startup procedure; when the first liquid level sensor is a capacitive sensor, if the first signal value is greater than or equal to the preset value K2, the A value is recorded and the controller executes a startup procedure.

4. The water level control method of a submersible pump according to claim 3, characterized in that: The startup procedure is as follows: when the first liquid level sensor is an electrode sensor, after the information processing module confirms that the first signal value A is less than or equal to the preset value K1, the third signal is output to the control module, and the control module starts the motor; when the first liquid level sensor is a capacitive sensor, after the information processing module confirms that the first signal value A is greater than or equal to the preset value K2, the third signal is output to the control module, and the control module starts the motor.

5. The water level control method of a submersible pump according to claim 4, characterized in that: The third signal is a feedback signal after the information processing module processes the first signal value A, and is used to control the control module to start the motor; the processing here refers to comparing the first signal value A with the preset value K1 or K2.

6. The water level control method of a submersible pump according to claim 1, characterized in that: In S2, the first liquid level sensor or the second liquid level sensor outputs a second signal value B to the information processing module of the controller, and the information processing module compares the second signal value B with nA. When the first liquid level sensor is an electrode sensor, if the second signal value B is greater than nA, the controller executes a shutdown procedure; when the first liquid level sensor is a capacitive sensor, if the second signal value B is less than or equal to nA, the controller executes a shutdown procedure.

7. The water level control method of a submersible pump according to claim 6, characterized in that: The shutdown procedure is: when the first liquid level sensor is an electrode sensor, after the information processing module confirms that the second signal value B is greater than nA, it outputs the fourth signal to the control module, and the control module stops the motor; when the first liquid level sensor is a capacitive sensor, after the information processing module confirms that the second signal value B is less than or equal to nA, it outputs the fourth signal to the control module, and the control module stops the motor.

8. The water level control method of a submersible pump according to claim 7, characterized in that: The fourth signal is a feedback signal after the information processing module processes the second signal value B, and is used to control the control module to stop the motor; the processing here refers to comparing the second signal value B with the size of nA.

9. A control method for a submersible pump, characterized in that: A pulse power supply is provided in the controller, and the pulse power supply is used for connecting the first liquid level sensor and the common end sensor.

10. The control method of a submersible pump according to claim 9, characterized in that: It also includes the water level control method for a submersible pump as described in any one of claims 1 to 8.

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