Remote control device of water pump

Abstract

The utility model relates to a remote control device of a water pump. The remote control device comprises a normally-open electric control switch, a normally-closed electric control switch, a vibration sensor, a first Schmitt trigger and a trigger driving module, one end of the normally-open electric control switch is connected with alternating current, the other end of the normally-open electric control switch is electrically connected with one end of the normally-closed electric control switch, and the other end of the normally-closed electric control switch is electrically connected with the power source connection end of a pump motor of the water pump. The output end of the vibration sensor is electrically connected with the input end of the first Schmitt trigger, the output end of the first Schmitt trigger is electrically connected with the control end of the trigger driving module, the input end of the trigger driving module is electrically connected with the output end of the transformer, and the output end of the trigger driving module is electrically connected with the control end of the normally closed electric control switch; the power supply circuit of the pump motor can be automatically cut off after the water pump is stuck, so that the pump motor is prevented from being burnt, and the safety performance of the water pump is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to water pump control technical field, concretely relates to a remote control device of water pump. BACKGROUND

[0002] The control device of water pump usually adopts remote control mode control, that is, adopts low voltage switch to control remote high voltage switch, to control the start and stop of water pump through high voltage switch, but when the agricultural water pump is used, there may be the situation that sundries enter the water pump and cause the pump to be stuck, if the water pump is not stopped in time after the pump is stuck, the pump motor may be burnt, in the prior art, after the water pump is stuck, an abnormal sound is emitted, and the operator judges whether the pump is stuck by identifying the abnormal sound of the water pump, if the operator is far away from the water pump, the abnormal sound of the water pump may not be heard, and the pump motor of the water pump is burnt. SUMMARY

[0003] In order to solve the technical problems that the pump motor is burnt due to the fact that the water pump cannot be stopped in time after the pump is stuck in the prior art, the utility model provides a remote control device of water pump.

[0004] The utility model solves the technical scheme as follows:

[0005] A remote control device of water pump, including transformer, power module, remote drive control module, normally open electric control switch, normally closed electric control switch, vibration sensor, first schmitt trigger and trigger drive module;

[0006] One end of normally open electric control switch is connected with alternating current, the other end of normally open electric control switch is electrically connected with one end of normally closed electric control switch, the other end of normally closed electric control switch is electrically connected with the power input end of the pump motor of water pump;

[0007] The input end of transformer is connected with alternating current, the output end of transformer is electrically connected with the input end of remote drive control module, the output end of remote drive control module is electrically connected with the control end of normally open electric control switch;

[0008] The input end of power module is electrically connected with the output end of transformer, the output end of power module is respectively electrically connected with vibration sensor power input end, the power input end of first schmitt trigger and the power input end of trigger drive module;The output end of vibration sensor is electrically connected with the input end of first schmitt trigger, the output end of first schmitt trigger is electrically connected with the control end of trigger drive module, the input end of trigger drive module is electrically connected with the output end of transformer, and the output end of trigger drive module is electrically connected with the control end of normally closed electric control switch.

[0009] The utility model discloses the beneficial effect is: through the remote drive control module to normally open electric control switch enable control, to normally open electric control switch's on-off is remotely controlled, vibration sensor is used to gather the vibration intensity of pump motor, to get vibration intensity value, when water pump jam, the strong vibration of pump motor, the vibration intensity of pump motor will exceed normal range at this moment, lead to vibration sensor detection vibration intensity value will exceed the preset value, vibration intensity value exceeds the preset value, first schmitt trigger output high level signal, trigger drive module receives the high level signal of first schmitt trigger output and turns on to realize transformer's output and normally closed electric control switch control end turns on, realizes the power supply of normally closed electric control switch control end, normally closed electric control switch control end electrifies after, normally closed electric control switch opens to realize automatic cut off the power supply circuit of pump motor, has guaranteed that pump motor will not be burnt, improved water pump's safety performance.

[0010] On the basis of the above technical scheme, the utility model still can make improvement as follows.

[0011] Further, it further includes a current sensor, a second Schmitt trigger, an OR gate and a signal amplification module; the current sensor is a Hall current sensor, a rod-shaped conductor is fixedly arranged in the through hole of the Hall current sensor, the rod-shaped conductor is matched with the through hole of the Hall current sensor, one end of the rod-shaped conductor is electrically connected with the other end of the normally open electric control switch, the other end of the rod-shaped conductor is electrically connected with one end of the normally closed electric control switch, the signal output end of the current sensor is electrically connected with the input end of the second Schmitt trigger; the OR gate includes a first input end and a second input end, the output end of the second Schmitt trigger is electrically connected with the first input end of the OR gate, the output end of the first Schmitt trigger is electrically connected with the second input end of the OR gate, the output end of the OR gate is electrically connected with the input end of the signal amplification module, and the output end of the signal amplification module is electrically connected with the control end of the trigger drive module; the output end of the power module is respectively electrically connected with the power input end of the second Schmitt trigger and the power input end of the signal amplification module.

[0012] The beneficial effect of adopting the above further scheme is that by arranging the current sensor, the second Schmitt trigger, the OR gate and the signal amplification module, when the water pump is stuck, the current on the pump motor will increase, the voltage signal output by the current sensor will be enhanced, when the voltage signal output by the current sensor exceeds the preset voltage threshold, the second Schmitt trigger is triggered and outputs a high-level voltage, after the high-level voltage output by the second Schmitt trigger is subjected to logical OR operation by the OR gate, the OR gate outputs a high-level signal even if the low-level signal output by the first Schmitt trigger, after the high-level signal output by the OR gate is amplified by the signal amplification module, the trigger driving module is turned on after receiving the high-level signal amplified by the signal amplification module, so as to realize that the output end of the transformer is turned on with the control end of the normally closed electric control switch, realize the power supply to the control end of the normally closed electric control switch, after the control end of the normally closed electric control switch is powered, the normally closed electric control switch is turned off, so as to realize the on-off of the power supply circuit of the pump motor by monitoring the current on the power supply circuit of the pump motor, and further ensure the safe working performance of the pump motor.

[0013] Further, the normally open electric control switch and the normally closed electric control switch are both relays, one end of the electromagnetic coil of the normally open electric control switch is electrically connected with the output end of the remote driving control module, the other end of the electromagnetic coil of the normally open electric control switch is grounded, one end of the normally open contact of the normally open electric control switch is connected with AC power, the other end of the normally open contact of the normally open electric control switch is electrically connected with one end of the current sensor, the other end of the current sensor is electrically connected with one end of the normally closed contact of the normally closed electric control switch, the other end of the normally closed contact of the normally closed electric control switch is electrically connected with the power input end of the pump motor, one end of the electromagnetic coil of the normally closed electric control switch is electrically connected with the output end of the trigger driving module, the other end of the electromagnetic coil of the normally closed electric control switch is grounded.

[0014] The beneficial effect of adopting the above further scheme is that by arranging the normally open electric control switch and the normally closed electric control switch as relays, the on-off of the relay contact can be controlled by controlling the on-off of the coil of the relay at a long distance, so as to realize the remote control of the start and stop of the water pump.

[0015] Further, the remote driving control module comprises a manual switch and a first resistor, one end of the manual switch is electrically connected with the output end of the transformer, the other end of the manual switch is electrically connected with one end of the first resistor, the other end of the first resistor is electrically connected with one end of the electromagnetic coil of the normally open electric control switch.

[0016] Further, the OR gate is a diode OR gate circuit module.

[0017] Furthermore, the diode OR gate circuit module includes a first diode, a second diode and a second resistor; one end of the second resistor is electrically connected to the cathode of the first diode and the cathode of the second diode respectively; the anode of the first diode is the first input end of the OR gate, the anode of the second diode is the second input end of the OR gate, and the other end of the second resistor is the output end of the OR gate.

[0018] Furthermore, the signal amplification module is a non-inverting amplifier.

[0019] Furthermore, the common-mode amplifier includes a third resistor, a fourth resistor, a fifth resistor and an operational amplifier, one end of the third resistor is electrically connected to the output end of the OR gate, the other end of the third resistor is electrically connected to the common-mode input end of the operational amplifier, the inverting input end of the operational amplifier is electrically connected to one end of the fourth resistor and one end of the fifth resistor respectively, the other end of the fourth resistor is electrically connected to the output end of the operational amplifier, the other end of the fifth resistor is grounded, and the output end of the operational amplifier is electrically connected to the control end of the trigger drive module.

[0020] Furthermore, the trigger drive module includes a sixth resistor, a seventh resistor, a transistor, an eighth resistor, a ninth resistor and a MOS transistor; one end of the sixth resistor is electrically connected to the output end of the operational amplifier, the other end of the sixth resistor is electrically connected to the base of the transistor, one end of the seventh resistor is electrically connected to the output end of the power supply module, the other end of the seventh resistor is electrically connected to the collector of the transistor, the gate of the MOS transistor is electrically connected to the emitter of the transistor and one end of the eighth resistor, respectively, the other end of the eighth resistor is grounded, one end of the ninth resistor is electrically connected to the output end of the transformer, one end of the ninth resistor is electrically connected to the drain of the MOS transistor, and the source of the MOS transistor is electrically connected to one end of the electromagnetic coil of the normally closed electronically controlled switch.

[0021] Furthermore, the transformer is an AC-to-DC step-down transformer, and the power module is a DC-to-DC step-down transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The circuit structure principle of this utility model Figure One ;

[0023] Figure 2 The circuit structure principle of this utility model Figure Two ;

[0024] Figure 3 This is the circuit schematic diagram of the remote drive control module;

[0025] Figure 4A circuit schematic diagram for a diode or gate module;

[0026] Figure 5 A circuit schematic diagram for a non-inverting amplifier;

[0027] Figure 6 A circuit schematic diagram for a trigger drive module. DETAILED DESCRIPTION

[0028] The principles and features of the present application are described below in conjunction with the accompanying drawings, which are presented only for the purpose of explanation and are not intended to limit the scope of the present application.

[0029] As shown in Figure 1 the embodiment provides a remote control device for a water pump, comprising a transformer, a power module, a remote drive control module, a normally open electric control switch, a normally closed electric control switch, a vibration sensor, a first Schmitt trigger and a trigger drive module;

[0030] One end of the normally open electric control switch is connected to AC power, and the other end of the normally open electric control switch is electrically connected to one end of the normally closed electric control switch, and the other end of the normally closed electric control switch is electrically connected to the power input end of the pump motor of the water pump;

[0031] The input end of the transformer is connected to AC power, and the output end of the transformer is electrically connected to the input end of the remote drive control module, and the output end of the remote drive control module is electrically connected to the control end of the normally open electric control switch;

[0032] The input end of the power module is electrically connected to the output end of the transformer, and the output end of the power module is respectively electrically connected to the power input end of the vibration sensor, the power input end of the first Schmitt trigger and the power input end of the trigger drive module; the output end of the vibration sensor is electrically connected to the input end of the first Schmitt trigger, the output end of the first Schmitt trigger is electrically connected to the control end of the trigger drive module, the input end of the trigger drive module is electrically connected to the output end of the transformer, and the output end of the trigger drive module is electrically connected to the control end of the normally closed electric control switch. Wherein, the transformer is an AC-to-DC step-down transformer, which is used to convert 22V AC voltage to +24V DC voltage, and the power module is a DC-to-DC step-down transformer, which is used to step down the +24V DC voltage output by the transformer to convert it to +5V DC voltage.

[0033] The embodiment enables the control of the normally open electric control switch by the remote drive control module, so as to remotely control the on-off of the normally open electric control switch. The vibration sensor is used to collect the vibration intensity of the pump motor, so as to obtain the vibration intensity value. When the water pump is stuck, the pump motor will vibrate strongly, and the vibration intensity of the pump motor will exceed the normal range, so that the vibration intensity value detected by the vibration sensor will exceed the preset value. After the vibration intensity value exceeds the preset value, the first Schmitt trigger outputs a high-level signal, and the driving module is turned on after receiving the high-level signal output by the first Schmitt trigger, so as to realize the conduction between the output end of the transformer and the control end of the normally closed electric control switch, realize the power supply of the control end of the normally closed electric control switch, and realize the automatic cut-off of the power supply line of the pump motor after the control end of the normally closed electric control switch is powered on, so as to ensure that the pump motor will not be burned out and improve the safety performance of the water pump.

[0034] As shown in Figure 2 In some embodiments, the remote control device of the water pump further comprises a current sensor, a second Schmitt trigger, an OR gate and a signal amplification module. The current sensor is a Hall current sensor, a rod-shaped conductor is fixedly arranged in the through hole of the Hall current sensor, the rod-shaped conductor is matched with the through hole of the Hall current sensor, one end of the rod-shaped conductor is electrically connected with the other end of the normally open electric control switch, the other end of the rod-shaped conductor is electrically connected with one end of the normally closed electric control switch, and the signal output end of the current sensor is electrically connected with the input end of the second Schmitt trigger. The OR gate comprises a first input end and a second input end, the output end of the second Schmitt trigger is electrically connected with the first input end of the OR gate, the output end of the first Schmitt trigger is electrically connected with the second input end of the OR gate, the output end of the OR gate is electrically connected with the input end of the signal amplification module, and the output end of the signal amplification module is electrically connected with the control end of the trigger driving module. The output end of the power supply module is respectively electrically connected with the power input end of the second Schmitt trigger and the power input end of the signal amplification module.

[0035] The embodiment sets the current sensor, the second Schmitt trigger, the OR gate and the signal amplification module; after the water pump is stuck, the current on the pump motor will increase, the voltage signal output by the current sensor will be enhanced, after the voltage signal output by the current sensor exceeds the preset voltage threshold, the second Schmitt trigger is triggered and outputs a high voltage level, after the high voltage level output by the second Schmitt trigger is subjected to logical OR operation by the OR gate, even if the low voltage level signal output by the first Schmitt trigger, the OR gate also outputs a high voltage level signal, after the high voltage level signal output by the OR gate is amplified by the signal amplification module, the trigger driving module receives the high voltage level signal amplified by the signal amplification module and is turned on, so that the output end of the transformer and the control end of the normally closed electric control switch are turned on, the power supply of the control end of the normally closed electric control switch is realized, after the control end of the normally closed electric control switch is electrified, the normally closed electric control switch is turned off, so that the power supply circuit of the pump motor is turned on and off by monitoring the current on the power supply circuit of the pump motor, and the safe working performance of the pump motor is further ensured.

[0036] In some embodiments, the normally open electric control switch and the normally closed electric control switch are both relays, one end of the electromagnetic coil of the normally open electric control switch is electrically connected with the output end of the remote driving control module, the other end of the electromagnetic coil of the normally open electric control switch is grounded, one end of the normally open contact of the normally open electric control switch is connected with alternating current, the other end of the normally open contact of the normally open electric control switch is electrically connected with one end of the current sensor, the other end of the current sensor is electrically connected with one end of the normally closed contact of the normally closed electric control switch, the other end of the normally closed contact of the normally closed electric control switch is electrically connected with the power input end of the pump motor, one end of the electromagnetic coil K2 of the normally closed electric control switch is electrically connected with the output end of the trigger driving module, the other end of the electromagnetic coil K2 of the normally closed electric control switch is grounded.

[0037] In the embodiment, the normally open electric control switch and the normally closed electric control switch are both relays, the on-off of the relay contact can be controlled by controlling the on-off of the coil of the relay, and the start-stop of the water pump can be remotely controlled.

[0038] As shown in Figure 3 In some embodiments, the remote driving control module includes a manual switch AQ and a first resistor R1, one end of the manual switch AQ is electrically connected with the output end of the transformer, the other end of the manual switch AQ is electrically connected with one end of the first resistor R1, the other end of the first resistor R1 is electrically connected with one end of the electromagnetic coil K1 of the normally open electric control switch.

[0039] In the embodiment, the on-off of the electromagnetic coil K1 of the normally open electric control switch is controlled by controlling the on-off of the manual switch AQ, so as to control the on-off of the normally open electric control switch.

[0040] As shown in Figure 4As shown, the OR gate is a diode OR gate circuit module. The diode OR gate circuit module includes a first diode D1, a second diode D2, and a second resistor R2; one end of the second resistor R2 is electrically connected to the cathode of the first diode D1 and the cathode of the second diode D2, respectively; the anode of the first diode D1 is the first input terminal of the OR gate, the anode of the second diode D2 is the second input terminal of the OR gate, and the other end of the second resistor R2 is the output terminal of the OR gate.

[0041] In the diode or gate circuit module, define the positive input voltage of the first diode D1 as Ua, the positive input voltage of the second diode D2 as Ub, and the voltage at the other end of the second resistor R2 as Uy. When Ua = Ub = 0V, both the first diode D1 and the second diode D2 are cut off, and Uy is 0V. When Ua = 3V and Ub = 0V, the first diode D1 is turned on, Uy = 3-0.7 = 2.3V, and the second diode D2 is cut off. Similarly, when Ua = 0V and Ub = 3V, the second diode D2 is turned on, the first diode D1 is cut off, and Uy = 2.3V. When Ua = Ub = 3V, both the first diode D1 and the second diode D2 are turned on, and Uy = 3-0.7 = 2.3V.

[0042] like Figure 5 As shown, the signal amplification module is a non-inverting amplifier. The non-inverting amplifier includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, and an operational amplifier U1. One end of the third resistor R3 is electrically connected to the output end of the OR gate, the other end of the third resistor R3 is electrically connected to the non-inverting input end of the operational amplifier U1, the inverting input end of the operational amplifier U1 is electrically connected to one end of the fourth resistor R4 and one end of the fifth resistor R5, respectively, the other end of the fourth resistor R4 is electrically connected to the output end of the operational amplifier U1, the other end of the fifth resistor R5 is grounded, and the output end of the operational amplifier U1 is electrically connected to the control end of the trigger driving module.

[0043] In the above-mentioned non-inverting amplifier, the input voltage at one end of the third resistor R3 is defined as Vi, and the voltage at the output end of the operational amplifier U1 is defined as Vo. Then, Vo = Vi 1 + R4 / R5. R4 represents the resistance value of the fourth resistor R4, and R5 represents the resistance value of the fifth resistor R5. The signal amplification factor can be adjusted by varying the resistance values ​​of the fourth resistor R4 and the fifth resistor R5.

[0044] like Figure 6As shown, in some embodiments, the trigger driving module comprises a sixth resistor R6, a seventh resistor R7, a triode Q1, an eighth resistor R8, a ninth resistor R9 and a MOS tube Q2; one end of the sixth resistor R6 is electrically connected with the output end of the operational amplifier U1, the other end of the sixth resistor R6 is electrically connected with the base of the triode Q1, one end of the seventh resistor R7 is electrically connected with the output end of the power module, the other end of the seventh resistor R7 is electrically connected with the collector of the triode Q1, the gate of the MOS tube Q2 is electrically connected with the emitter of the triode Q1 and one end of the eighth resistor R8 respectively, the other end of the eighth resistor R8 is grounded, one end of the ninth resistor R9 is electrically connected with the output end of the transformer, one end of the ninth resistor R9 is electrically connected with the drain of the MOS tube Q2, and the source of the MOS tube Q2 is electrically connected with one end of the electromagnetic coil K2 of the normally closed electrically controlled switch.

[0045] In the embodiment, when the or gate outputs a high level, the output end of the operational amplifier U1 outputs a high level signal after amplification, the high level signal after amplification is connected to the base of the triode Q1 through the sixth resistor R6, the triode Q1 is turned on, the voltage of +24V is divided through the seventh resistor R7 and the eighth resistor R8, the gate voltage of the MOS tube Q2 is the voltage between the eighth resistor R8, then the MOS tube Q2 is turned on, the electromagnetic coil K2 of the normally closed electrically controlled switch is connected with the +24V voltage output by the transformer through the ninth resistor R9 in series, the electromagnetic coil K2 of the normally closed electrically controlled switch is electrified to be magnetized, the normally closed electrically controlled switch is opened, and the pump motor stops working due to power loss.

[0046] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the concept and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A remote control device for a water pump, characterized in that: It includes a transformer, a power module, a remote drive control module, a normally open electric control switch, a normally closed electric control switch, a vibration sensor, a first Schmitt trigger and a trigger drive module; One end of the normally open electric control switch is connected to the alternating current, the other end of the normally open electric control switch is electrically connected to one end of the normally closed electric control switch, and the other end of the normally closed electric control switch is electrically connected to the power supply input end of the pump motor of the water pump; The input end of the transformer is connected to the alternating current, the output end of the transformer is electrically connected to the input end of the remote drive control module, and the output end of the remote drive control module is electrically connected to the control end of the normally open electric control switch; the input end of the power supply module is electrically connected to the output end of the transformer, and the output end of the power supply module is electrically connected to the power input end of the vibration sensor, the power input end of the first Schmitt trigger and the power input end of the trigger drive module respectively; the output end of the vibration sensor is electrically connected to the input end of the first Schmitt trigger, the output end of the first Schmitt trigger is electrically connected to the control end of the trigger drive module, the input end of the trigger drive module is electrically connected to the output end of the transformer, and the output end of the trigger drive module is electrically connected to the control end of the normally closed electric control switch.

2. The remote control device for a water pump according to claim 1, characterized in that: It also includes a current sensor, a second Schmitt trigger, an OR gate and a signal amplification module; the current sensor is a Hall current sensor, a rod-shaped conductor is fixed in the through-hole of the Hall current sensor, the rod-shaped conductor is interlaced and matched with the through-hole of the Hall current sensor, one end of the rod-shaped conductor is electrically connected to the other end of the normally open electric control switch, and the other end of the rod-shaped conductor is electrically connected to one end of the normally closed electric control switch, and the signal output end of the current sensor is electrically connected to the input end of the second Schmitt trigger; the OR gate includes a first input end and a second input end, the output end of the second Schmitt trigger is electrically connected to the first input end of the OR gate, the output end of the first Schmitt trigger is electrically connected to the second input end of the OR gate, the output end of the OR gate is electrically connected to the input end of the signal amplification module, and the output end of the signal amplification module is electrically connected to the control end of the trigger driving module; the output end of the power supply module is electrically connected to the power input end of the second Schmitt trigger and the power input end of the signal amplification module respectively.

3. The remote control device for a water pump according to claim 2, characterized in that: The normally open electric control switch and the normally closed electric control switch are both relays, one end of the electromagnetic coil of the normally open electric control switch is electrically connected to the output end of the remote drive control module, the other end of the electromagnetic coil of the normally open electric control switch is grounded, one end of the normally open contact of the normally open electric control switch is connected to alternating current, the other end of the normally open contact of the normally open electric control switch is electrically connected to one end of the current sensor; the other end of the current sensor is electrically connected to one end of the normally closed contact of the normally closed electric control switch, the other end of the normally closed contact of the normally closed electric control switch is electrically connected to the power supply access end of the pump motor, one end of the electromagnetic coil of the normally closed electric control switch is electrically connected to the output end of the trigger drive module, and the other end of the electromagnetic coil of the normally closed electric control switch is grounded.

4. The remote control device for a water pump according to claim 3, characterized in that: The remote drive control module includes a manual switch (AQ) and a first resistor (R1), one end of the manual switch (AQ) is electrically connected to the output end of the transformer, the other end of the manual switch (AQ) is electrically connected to one end of the first resistor (R1), and the other end of the first resistor (R1) is electrically connected to one end of the electromagnetic coil of the normally open electric control switch.

5. The remote control device for a water pump according to claim 3, characterized in that: The OR gate is a diode OR gate circuit module.

6. The remote control device for a water pump according to claim 5, characterized in that: The diode OR gate circuit module comprises a first diode (D1), a second diode (D2) and a second resistor (R2); one end of the second resistor (R2) is electrically connected to the cathode of the first diode (D1) and the cathode of the second diode (D2), respectively; the anode of the first diode (D1) is the first input end of the OR gate, the anode of the second diode (D2) is the second input end of the OR gate, and the other end of the second resistor (R2) is the output end of the OR gate.

7. The remote control device for a water pump according to claim 3, characterized in that: The signal amplification module is a non-inverting amplifier.

8. The remote control device for a water pump according to claim 7, characterized in that: The non-inverting amplifier comprises a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5) and an operational amplifier (U1); one end of the third resistor (R3) is electrically connected to the output end of the OR gate; the other end of the third resistor (R3) is electrically connected to the non-inverting input end of the operational amplifier (U1); the inverting input end of the operational amplifier (U1) is electrically connected to one end of the fourth resistor (R4) and one end of the fifth resistor (R5), respectively; the other end of the fourth resistor (R4) is electrically connected to the output end of the operational amplifier (U1); the other end of the fifth resistor (R5) is grounded; and the output end of the operational amplifier (U1) is electrically connected to the control end of the trigger drive module.

9. The remote control device for a water pump according to claim 8, characterized in that: The trigger drive module comprises a sixth resistor (R6), a seventh resistor (R7), a transistor (Q1), an eighth resistor (R8), a ninth resistor (R9) and a MOS transistor (Q2); one end of the sixth resistor (R6) is electrically connected to the output end of the operational amplifier (U1), the other end of the sixth resistor (R6) is electrically connected to the base of the transistor (Q1), one end of the seventh resistor (R7) is electrically connected to the output end of the power module, the other end of the seventh resistor (R7) is electrically connected to the collector of the transistor (Q1), the gate of the MOS transistor (Q2) is electrically connected to the emitter of the transistor (Q1) and one end of the eighth resistor (R8), the other end of the eighth resistor (R8) is grounded, one end of the ninth resistor (R9) is electrically connected to the output end of the transformer, one end of the ninth resistor (R9) is electrically connected to the drain of the MOS transistor (Q2), and the source of the MOS transistor (Q2) is electrically connected to one end of the electromagnetic coil of the normally closed electric control switch.

10. The remote control device for a water pump according to any one of claims 1 to 9, characterized in that: The transformer is an AC-to-DC step-down transformer, and the power supply module is a DC-to-DC step-down transformer.

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