A control system for tobacco seedling cultivation by wet-dry alternation

Abstract

The utility model relates to tobacco seedling automation technical field discloses a kind of control systems of dry-wet tobacco seedling alternation, including control module, sensing module, power module, time control module and water suction pump, and control module and time control module are connected with water suction pump respectively by control module, control module and time control module can control the start-stop of water suction pump, time control module can make water suction pump regularly open and regularly close, realizes periodic circulation pumping in the process of seedling, control module is connected with sensing module, so that control module can judge whether to start and close water suction pump according to the signal detected by sensing module, so that the moisture of seedling can be controlled in the regularly start-stop of periodic cycle and can also respond to abnormality, degree of automation is high, and activity is good, adaptability is strong, effectiveness is strong. The control system of dry-wet tobacco seedling alternation of the utility model closely combines with the actual water demand law design system parameter of crop growth, and system operation can effectively promote crop growth.

Description

Technical Field

[0001] This utility model relates to the field of automated tobacco seedling cultivation technology, and in particular to a control system for alternating wet and dry tobacco seedling cultivation. Background Technology

[0002] In tobacco seedling cultivation, water control is crucial for seedling growth. Currently, water control in tobacco seedling cultivation involves manually turning on water pumps to fill the seedling beds, which is time-consuming, labor-intensive, costly, inefficient, and lacks precise control. Utility Model Content

[0003] The purpose of this invention is to provide a highly automated, flexible, adaptable, and effective control system for alternating wet and dry tobacco seedling cultivation. This invention's control system for alternating wet and dry tobacco seedling cultivation is designed with system parameters closely aligned with the actual water requirements of crop growth, and its operation effectively promotes crop growth.

[0004] To achieve the above objectives, this utility model provides a control system for alternating wet and dry tobacco seedling cultivation, including a control module, a sensing module, a power supply module, a time control module, and a water pump. The power module is electrically connected to the control module, the sensing module, the time control module and the water pump. The sensing module is connected to the control module, the control module is connected to the water pump, and the time control module is connected to the water pump. The power supply module supplies power to the control module, the sensing module, the time control module, and the water pump. The sensing module is used to monitor the seedling environment and transmit the monitoring signal to the control module. The control module receives the signal from the sensing module and sends control commands to the water pump to control the start and stop of the water pump. The time control module is used to set a time and control the start and stop of the water pump according to the set time.

[0005] As a preferred embodiment, the power supply module includes a first power supply, a second power supply, a third power supply, and a fourth power supply. The first power supply powers the control module, the second power supply powers the sensing module, the third power supply powers the time control module, and the fourth power supply powers the water pump. The fourth power supply is AC power.

[0006] As a preferred embodiment, it also includes intermediate relays KA1 and KA2 and AC contactor KM1, wherein the fourth power supply includes a live wire L and a neutral wire N. The two ends of the coil of the intermediate relay KA1 are connected to the output terminal and the common power terminal of the control module, respectively. The two ends of the coil of the intermediate relay KA2 are connected to the output terminal and the common power terminal of the time control module, respectively. The normally open contact of the intermediate relay KA1 and the normally open contact of the intermediate relay KA2 are connected in parallel and then connected to one end of the coil KM1-1 of the AC contactor KM1. The other end of the coil KM1-1 of the AC contactor KM1 is connected to the neutral line N. One end of the main contact KM1-2 of the AC contactor KM1 is connected to the live wire L, and the other end of the main contact KM1-2 of the AC contactor KM1 is connected to one end of the water pump, and the other end of the water pump is connected to the neutral wire N.

[0007] As a preferred embodiment, the device further includes diodes D1 and D2, wherein the anode of diode D1 is connected to the negative terminal of intermediate relay KA1, the cathode of diode D1 is connected to the positive terminal of intermediate relay KA1, the anode of diode D2 is connected to the negative terminal of intermediate relay KA2, and the cathode of diode D2 is connected to the positive terminal of intermediate relay KA2.

[0008] As a preferred embodiment, the system also includes a three-position selector switch SW. The common input terminal of the three-position selector switch SW is connected to the live wire L. The output terminal of the first branch of the three-position selector switch SW is connected to one end of the main contact KM1-2 of the AC contactor KM1. The other end of the main contact KM1-2 of the AC contactor KM1 is connected to the water pump. The output terminal of the second branch of the three-position selector switch SW is connected to the water pump.

[0009] As a preferred embodiment, the system also includes an AC contactor KM2. The output terminal of the second branch of the three-position selector switch SW is connected to one end of the main contact KM2-2 of the AC contactor KM2. The other end of the main contact KM2-2 of the AC contactor KM2 is connected in parallel with the other end of the main contact KM1-2 of the AC contactor KM1, and then connected to the water pump. One end of the coil KM2-1 of the AC contactor KM2 is connected to the output terminal of the second branch of the three-position selector switch SW, and the other end of the coil KM2-1 is connected to the neutral wire N.

[0010] As a preferred embodiment, it also includes a normally closed switch S1 and a normally open switch S2. The output terminal of the second branch of the three-position selector switch SW, the normally closed switch S1, and the normally open switch S2 are connected in series and finally connected to one end of the coil KM2-1 of the AC contactor KM2.

[0011] As a preferred embodiment, the normally open switch S2 is connected in parallel with the auxiliary normally open contact KM2-3 of the AC contactor KM2.

[0012] As a preferred embodiment, the system also includes a thermal overload relay FR. The other end of the main contact KM2-2 of the AC contactor KM2 is connected in parallel with the other end of the main contact KM1-2 of the AC contactor KM1, and the parallel connection is then connected to the input terminal of the thermal overload relay FR. The output terminal of the thermal overload relay FR is connected to the water pump.

[0013] As a preferred embodiment, the system also includes indicator lights L1 and L2. The two ends of indicator light L1 are connected to the common input terminal of the three-position selector switch SW and the output terminal of the first branch, respectively. The two ends of indicator light L2 are connected to the common input terminal of the three-position selector switch SW and the output terminal of the second branch, respectively.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention connects a control module and a timing module to a water pump, both of which can control the pump's start and stop. The timing module allows the pump to be turned on and off at set times, enabling periodic water pumping during seedling cultivation. The control module is connected to a sensor module, allowing it to determine whether to start or stop the pump based on signals detected by the sensor. If the sensor reading is greater than or less than a threshold, the pump is started or stopped. This ensures that the seedling moisture is controlled within a cyclical, timed start-stop system while also handling anomalies. The system is highly automated, active, and adaptable. This invention's control system for alternating wet and dry tobacco seedling cultivation closely integrates system parameters with the actual water requirements of crop growth, effectively promoting crop growth. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the application scenario of the control system for alternating wet and dry tobacco seedling cultivation according to an embodiment of this utility model.

[0016] Figure 2 This is a schematic diagram of the control system for alternating wet and dry tobacco seedling cultivation according to an embodiment of this utility model.

[0017] Figure 3 This is a circuit diagram of the control system for alternating wet and dry tobacco seedling cultivation according to Embodiment 2 of this utility model.

[0018] In the diagram, 100 is the control module; 200 is the sensor module; 300 is the power supply module; 400 is the time control module; 500 is the water pump; 600 is the measurement conversion circuit; 700 is the A / D conversion circuit; and 800 is the display module. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0020] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0023] Example 1 like Figure 1As shown, this embodiment of the invention employs a water storage tank and a seedling tank arranged vertically during seedling cultivation. A water pump 500 draws water from the lower water storage tank into the upper seedling tank. The seedling cultivation process involves starting the pump 500 between 8:00 AM and 10:00 AM daily to inject water from the storage tank into the upper seedling tank. The pump 500 starts at 8:00 AM and stops at 10:00 AM. The seedling tank has drainage holes to allow water to drain into the storage tank. After the pump 500 stops, the water in the seedling tank is completely drained by 4:00 PM, leaving the seedling tank in a dry state from 4:00 PM to 8:00 AM the following morning, thus achieving alternating wet and dry conditions. Therefore, the pump 500 needs to start and stop at fixed times. This invention utilizes a time control module 400 to time the start and stop of the pump 500. In addition, the timed start and stop of the water pump 500 in this embodiment is to ensure the humidity and temperature of the substrate for planting tobacco seedlings in the seedling bed. However, due to environmental factors, abnormal environmental conditions can lead to abnormal humidity and temperature of the substrate for planting tobacco seedlings. In this case, it is necessary to add water to the seedling bed, that is, to start and stop the water pump 500 at other times and to achieve automatic control. This invention sets up a sensor module 200 and a control module 100. The sensor module 200 detects abnormalities, and the control module 100 sends control commands to the water pump 500 based on the signals from the sensor module 200, starting and stopping the water pump 500 outside the specified time period. Thus, the entire seedling process can be automated without manual intervention.

[0024] like Figure 2As shown, a preferred embodiment of the present invention provides a control system for alternating wet and dry tobacco seedling cultivation, comprising a control module 100, a sensor module 200, a power supply module 300, a time control module 400, and a water pump 500. The power supply module 300 is electrically connected to the control module 100, the sensor module 200, the time control module 400, and the water pump 500. The sensor module 200 is connected to the control module 100, the control module 100 is connected to the water pump 500, and the time control module 400 is connected to the water pump 500. The power supply module 300 provides power to the control module 100, the sensor module 200, the time control module 400, and the water pump 500. The sensor module 200 monitors the seedling environment and transmits the monitoring signals to the control module 100. The control module 100 receives the signals from the sensor module 200 and sends control commands to the water pump 500 to control its start and stop. The time control module 400 sets a time and controls the start and stop of the water pump 500 according to the set time. In this embodiment, the control module 100 and the time control module 400 are respectively connected to the water pump 500. Both the control module 100 and the time control module 400 can control the start and stop of the water pump 500. The time control module 400 can enable the water pump 500 to start and stop at set times, realizing periodic water pumping during the seedling process. The control module 100 is connected to the sensor module 200, so that the control module 100 can determine whether to start and stop the water pump 500 based on the signal detected by the sensor module 200. If the detection value of the sensor module 200 is greater than or less than the threshold, the water pump 500 is started or stopped. This allows the water for seedling cultivation to be controlled in a periodic cycle of timed start and stop, while also being able to cope with abnormalities. It has a high degree of automation, good activity, and strong adaptability.

[0025] Example 2 The difference between this embodiment and Embodiment 1 is that, based on Embodiment 1, this embodiment further explains the control system for alternating wet and dry tobacco seedling cultivation.

[0026] like Figure 3 As shown, the power module 300 in this embodiment includes a first power supply, a second power supply, a third power supply, and a fourth power supply. The first power supply powers the control module 100, the second power supply powers the sensor module 200, the third power supply powers the time control module 400, and the fourth power supply powers the water pump 500. The fourth power supply is AC power. The control module 100, sensor module 200, time control module 400, and water pump 500 are powered by their respective power supplies, enabling independent operation of each device and facilitating maintenance and replacement.

[0027] This embodiment also includes intermediate relays KA1 and KA2 and AC contactor KM1. The fourth power supply includes a live wire L and a neutral wire N. The two ends of the coil of intermediate relay KA1 are connected to the output terminal of control module 100 and the common power supply terminal, respectively. The two ends of the coil of intermediate relay KA2 are connected to the output terminal of time control module 400 and the common power supply terminal, respectively. The normally open contact of intermediate relay KA1 and the normally open contact of intermediate relay KA2 are connected in parallel and then connected to one end of the coil KM1-1 of AC contactor KM1. The other end of the coil KM1-1 of AC contactor KM1 is connected to the neutral wire N. One end of the main contact KM1-2 of AC contactor KM1 is connected to the live wire L. The other end of the main contact KM1-2 of AC contactor KM1 is connected to one end of water pump 500. The other end of water pump 500 is connected to the neutral wire N. During time control, the time control module 400 outputs, energizing the coil of intermediate relay KA2. This closes the normally open contact of intermediate relay KA2, energizing the coil KM1-1 of AC contactor KM1, closing the main contact KM1-2 of AC contactor KM1, and starting the water pump 500. When the sensor detects an abnormality, the control module 100 outputs, energizing the coil of intermediate relay KA1. This closes the normally open contact of intermediate relay KA1, energizing the coil KM1-1 of AC contactor KM1, closing the main contact KM1-2 of AC contactor KM1, and starting the water pump 500.

[0028] Furthermore, the control system also includes diodes D1 and D2. The anode of diode D1 is connected to the cathode of intermediate relay KA1, and the cathode of diode D1 is connected to the anode of intermediate relay KA1. The anode of diode D2 is connected to the cathode of intermediate relay KA2, and the cathode of diode D2 is connected to the anode of intermediate relay KA2. Diodes D1 and D2 prevent reverse voltage from burning out the output stage circuit of the module due to incorrect reversal of the positive and negative terminals of the timing module 400 or control module 100 during wiring. The diodes provide a path for discharging reverse current.

[0029] In addition, the control system of this embodiment also includes a three-position selector switch SW. The common input terminal of the three-position selector switch SW is connected to the live wire L. The output terminal of the first branch of the three-position selector switch SW is connected to one end of the main contact KM1-2 of the AC contactor KM1. The other end of the main contact KM1-2 of the AC contactor KM1 is connected to the water pump 500. The output terminal of the second branch of the three-position selector switch SW is connected to the water pump 500. When the three-position selector switch SW is switched to the first branch, the system is in automatic mode, and the water pump 500 is started and stopped by the control module 100 connected to the time control module 400 and the sensor. When the three-position selector switch SW is switched to the second branch, the system is in manual mode, and the water pump 500 is directly controlled. When the three-position selector switch SW is switched to the third branch, the entire system is shut down.

[0030] The control system in this embodiment also includes an AC contactor KM2. The output terminal of the second branch of the three-position selector switch SW is connected to one end of the main contact KM2-2 of the AC contactor KM2. The other end of the main contact KM2-2 of the AC contactor KM2 is connected in parallel with the other end of the main contact KM1-2 of the AC contactor KM1, and then connected to the water pump 500. One end of the coil KM2-1 of the AC contactor KM2 is connected to the output terminal of the second branch of the three-position selector switch SW, and the other end of the coil KM2-1 is connected to the neutral wire N. Using the AC contactor KM2 further improves the safety and reliability of the system circuit. When switching to the second branch of the three-position selector switch SW, the coil KM2-1 of the AC contactor KM2 is energized, the main contact KM2-2 of the AC contactor KM2 closes, and the water pump 500 runs.

[0031] In addition, the control system also includes normally closed switch S1 and normally open switch S2. The output terminal of the second branch of the three-position selector switch SW, normally closed switch S1, and normally open switch S2 are connected in series and finally connected to one end of the coil KM2-1 of AC contactor KM2. By using normally closed switch S1 and normally open switch S2, the start and stop of water pump 500 can be freely controlled when switching to the second branch of the three-position selector switch SW. In this embodiment, both normally closed switch S1 and normally open switch S2 are push-button switches.

[0032] In this embodiment, the normally open switch S2 is connected in parallel with the auxiliary normally open contact KM2-3 of the AC contactor KM2 to achieve self-locking.

[0033] In addition, the control system of this embodiment also includes a thermal overload relay FR. The other end of the main contact KM2-2 of AC contactor KM2 is connected in parallel with the other end of the main contact KM1-2 of AC contactor KM1, and the parallel connection is then connected to the input terminal of the thermal overload relay FR. The output terminal of the thermal overload relay FR is connected to the water pump 500. In case of overload, the thermal overload relay FR activates, cuts off the circuit, and stops the water pump 500 from running, preventing it from burning out due to overheating and thus providing protection.

[0034] The control system in this embodiment also includes indicator lights L1 and L2. Indicator light L1 is connected to the common input terminal of the three-position selector switch SW and the output terminal of the first branch, respectively. Indicator light L2 is connected to the common input terminal of the three-position selector switch SW and the output terminal of the second branch, respectively. When switched to the first branch of the three-position selector switch SW, indicator light L1 illuminates; when switched to the second branch of the three-position selector switch SW, indicator light L2 illuminates, serving an indicative function.

[0035] In this embodiment, diodes D3 and D4 are also included. The anode of diode D3 is connected to the negative terminal of the coil KM1-1 of AC contactor KM1, and the cathode of diode D3 is connected to the positive terminal of the coil KM1-1 of AC contactor KM1. The anode of diode D4 is connected to the negative terminal of the coil KM2-1 of AC contactor KM2, and the cathode of diode D4 is connected to the positive terminal of the coil KM2-1 of AC contactor KM2. Diodes D3 and D4 provide a freewheeling circuit for the electromotive force of the coil, preventing high-voltage spikes from impacting the output transistors or ICs of the timing module 400 and the control module 100, thereby protecting the output terminals of the timing module 400 and the control module 100.

[0036] Furthermore, the system in this embodiment also includes a circuit breaker QF, which is connected in series with the live wire L and the neutral wire N. The circuit breaker QF is an interlocking double-pole circuit breaker that switches the power supply when a circuit fault occurs, thus providing protection.

[0037] In addition, the casing of the water pump 500 is grounded.

[0038] The other components in this embodiment are the same as those in Embodiment 1, and will not be described again here.

[0039] Example 3 The difference between this embodiment and Embodiment 2 is that, based on Embodiment 2, this embodiment further explains the control system for alternating wet and dry tobacco seedling cultivation.

[0040] The sensing module 200 in this embodiment includes several temperature sensors and humidity sensors, which are respectively connected to the control module 100 in communication.

[0041] Furthermore, the sensing module 200 is connected to the control module 100 via the measurement conversion circuit 600 and the A / D conversion circuit 700. In addition, the control module 100 is also connected to the display module 800, which displays the measurement values ​​of each temperature and humidity sensor.

[0042] Optionally, both the control module 100 and the timing module 400 use an 8051 microcontroller.

[0043] The other components in this embodiment are the same as those in Embodiment 2, and will not be described again here.

[0044] The working process of this utility model is as follows: During daily operation, the three-position selector switch SW is switched to the first branch, the system is in automatic mode, and the water pump 500 is started and stopped by the control module 100 connected to the time control module 400 and the sensor, and the indicator light L1 is lit. (1) The start and stop time of the water pump 500 is set by the time control module 400. When the start time is up, the time control module 400 outputs, drives the coil of the intermediate relay KA2 to be energized, the normally open contact of the intermediate relay KA2 is closed, the coil KM1-1 of the AC contactor KM1 is energized, the main contact KM1-2 of the AC contactor KM1 is closed, and the water pump 500 runs. When the stop time is up, the time control module 400 is disconnected, the coil of the intermediate relay KA2 is de-energized, the normally open contact of the intermediate relay KA2 is opened, the coil KM1-1 of the AC contactor KM1 is de-energized, the main contact KM1-2 of the AC contactor KM1 is opened, and the water pump 500 stops. (2) When the sensor module 200 detects an abnormal signal, the control module 100 outputs power to energize the coil of the intermediate relay KA1, causing the normally open contact of the intermediate relay KA1 to close. This energizes the coil KM1-1 of the AC contactor KM1, closes the main contact KM1-2 of the AC contactor KM1, and starts the water pump 500. When the signal detected by the sensor module 200 is normal, the control module 100 disconnects, the coil of the intermediate relay KA2 is de-energized, the normally open contact of the intermediate relay KA2 opens, the coil KM1-1 of the AC contactor KM1 is de-energized, the main contact KM1-2 of the AC contactor KM1 opens, and the water pump 500 stops. (3) In manual control, switch the three-position selector switch SW to the second branch, the indicator light L2 will light up, press the normally open switch S2, the coil KM2-1 of AC contactor KM2 will be energized, the main contact of AC contactor KM2-2 will close, the water pump 500 will run, and the auxiliary normally open contact KM2-3 of AC contactor KM2 will close, achieving self-locking. Open the normally open switch S2, the coil KM2-1 of AC contactor KM2 will be de-energized, the main contact of AC contactor KM2-2 will open, the water pump 500 will stop, and the auxiliary normally open contact KM2-3 of AC contactor KM2 will open. (4) When it is necessary to stop the entire system, switch the three-position selector switch SW to the third branch.

[0045] In summary, this utility model embodiment provides a control system for alternating wet and dry tobacco seedling cultivation. The system is connected to a water pump 500 via a control module 100 and a timing module 400, respectively. Both the control module 100 and the timing module 400 can control the start and stop of the water pump 500. The timing module 400 allows the water pump 500 to be turned on and off at set times, achieving periodic water pumping during seedling cultivation. The control module 100 is connected to a sensor module 200, enabling it to determine whether to start or stop the water pump 500 based on signals detected by the sensor module 200. If the detected value by the sensor module 200 is greater than or less than a threshold, the water pump 500 is started or stopped. This ensures that the seedling moisture is controlled within a periodic cycle of timed start and stop while also responding to abnormalities. The system exhibits a high degree of automation, good activity, and strong adaptability. The control system for alternating wet and dry tobacco seedling cultivation in this utility model embodiment closely integrates the actual water requirements of crop growth into its system parameter design, effectively promoting crop growth. Furthermore, this embodiment of the invention also includes a three-position selector switch SW, which allows selection of automatic mode, manual mode, or system shutdown.

[0046] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A control system for alternating wet and dry tobacco seedling cultivation, characterized in that, It includes a control module (100), a sensing module (200), a power supply module (300), a time control module (400), and a water pump (500). The power module (300) is electrically connected to the control module (100), the sensing module (200), the time control module (400), and the water pump (500). The sensing module (200) is connected to the control module (100), the control module (100) is connected to the water pump (500), and the time control module (400) is connected to the water pump (500). The power module (300) supplies power to the control module (100), the sensor module (200), the time control module (400), and the water pump (500). The sensor module (200) is used to monitor the seedling environment and transmit the monitoring signal to the control module (100). The control module (100) receives the signal from the sensor module (200) and sends a control command to the water pump (500) to control the start and stop of the water pump (500). The time control module (400) is used to set a time and control the start and stop of the water pump (500) according to the set time.

2. The control system according to claim 1, characterized in that, The power module (300) includes a first power supply, a second power supply, a third power supply and a fourth power supply. The first power supply powers the control module (100), the second power supply powers the sensing module (200), the third power supply powers the time control module (400), and the fourth power supply powers the water pump (500). The fourth power supply is AC power.

3. The control system according to claim 2, characterized in that, It also includes intermediate relays KA1 and KA2 and AC contactor KM1, and the fourth power supply includes a live wire L and a neutral wire N. The two ends of the coil of the intermediate relay KA1 are connected to the output terminal and the common power terminal of the control module (100) respectively. The two ends of the coil of the intermediate relay KA2 are connected to the output terminal and the common power terminal of the time control module (400) respectively. The normally open contact of the intermediate relay KA1 and the normally open contact of the intermediate relay KA2 are connected in parallel and then connected to one end of the coil KM1-1 of the AC contactor KM1. The other end of the coil KM1-1 of the AC contactor KM1 is connected to the neutral line N. One end of the main contact KM1-2 of the AC contactor KM1 is connected to the live wire L, the other end of the main contact KM1-2 of the AC contactor KM1 is connected to one end of the water pump (500), and the other end of the water pump (500) is connected to the neutral wire N.

4. The control system according to claim 3, characterized in that, It also includes diodes D1 and D2. The anode of diode D1 is connected to the negative terminal of intermediate relay KA1, and the cathode of diode D1 is connected to the positive terminal of intermediate relay KA1. The anode of diode D2 is connected to the negative terminal of intermediate relay KA2, and the cathode of diode D2 is connected to the positive terminal of intermediate relay KA2.

5. The control system according to claim 4, characterized in that, It also includes a three-position selector switch SW, the common input terminal of which is connected to the live wire L, the output terminal of the first branch of the three-position selector switch SW is connected to one end of the main contact KM1-2 of the AC contactor KM1, the other end of the main contact KM1-2 of the AC contactor KM1 is connected to the water pump (500), and the output terminal of the second branch of the three-position selector switch SW is connected to the water pump (500).

6. The control system according to claim 5, characterized in that, It also includes an AC contactor KM2. The output terminal of the second branch of the three-position selector switch SW is connected to one end of the main contact KM2-2 of the AC contactor KM2. The other end of the main contact KM2-2 of the AC contactor KM2 is connected in parallel with the other end of the main contact KM1-2 of the AC contactor KM1 and then connected to the water pump (500). One end of the coil KM2-1 of the AC contactor KM2 is connected to the output terminal of the second branch of the three-position selector switch SW, and the other end of the coil KM2-1 is connected to the neutral line N.

7. The control system according to claim 6, characterized in that, It also includes a normally closed switch S1 and a normally open switch S2. The output terminal of the second branch of the three-position selector switch SW, the normally closed switch S1, and the normally open switch S2 are connected in series and finally connected to one end of the coil KM2-1 of the AC contactor KM2.

8. The control system according to claim 7, characterized in that, The normally open switch S2 is connected in parallel with the auxiliary normally open contact KM2-3 of the AC contactor KM2.

9. The control system according to claim 8, characterized in that, It also includes a thermal overload relay FR. The other end of the main contact KM2-2 of the AC contactor KM2 is connected in parallel with the other end of the main contact KM1-2 of the AC contactor KM1, and the parallel connection is connected to the input terminal of the thermal overload relay FR. The output terminal of the thermal overload relay FR is connected to the water pump (500).

10. The control system according to claim 9, characterized in that, It also includes indicator lights L1 and L2. The two ends of indicator light L1 are connected to the common input terminal of the three-position selector switch SW and the output terminal of the first branch, respectively. The two ends of indicator light L2 are connected to the common input terminal of the three-position selector switch SW and the output terminal of the second branch, respectively.

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