Control device for controlling flow of water pump

Abstract

The utility model relates to a control device for controlling the flow of a water pump. The control device comprises an electronic flowmeter, a Schmitt trigger, a driving control unit, an electric control selection switch unit, a load unit, an alternating-current transformer and a multi-voltage output power supply unit, the signal output end of the electronic flowmeter is electrically connected with the signal input end of the Schmitt trigger, the signal output end of the Schmitt trigger is electrically connected with the enabling input end of the driving control unit, and the signal input end of the driving control unit is electrically connected with the output end of the multi-voltage output power supply unit. The signal output end of the driving control unit is electrically connected with the selection control end of the electric control selection switch unit; the output end of the alternating-current transformer is electrically connected with one end of each load unit, and the other end of each load unit is electrically connected with the corresponding switch input end; by changing the power supply voltage of the pump motor and changing the rotating speed of the pump motor, the power supply voltage of the water pump motor is reduced, the flow of the water pump is reduced, and waste of water resources is prevented.

Description

TECHNICAL FIELD

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

[0002] The flow control of water pump is mainly through the change valve's open and close degree to control the flow of water pump, in the traditional water pump flow control, especially on the agricultural water pump, mainly adopts centrifugal pump pumping, and the flow control of water pump usually adopts the valve to control the flow of water pump.

[0003] On the flow control of agricultural water pump, it is often not timely to control, in the summer especially in the power peak period in remote areas, under the condition of unstable voltage, when irrigating, because it is unable to manually accurately control the flow, when the grid voltage is low, the water pump motor may be modulated high gear to improve the flow of water pump to meet the irrigation demand, but when the grid power recovers to normal, the voltage of water pump motor rises, resulting in excessive flow, causing waste of water resources, it can be seen that the existing agricultural water pump cannot limit the power supply voltage of water pump according to the flow, causing waste of water resources. SUMMARY

[0004] In order to solve the technical problems that the existing agricultural water pump cannot limit the power supply voltage of water pump according to the flow, causing waste of water resources, the utility model provides a control device for controlling the flow of water pump.

[0005] The technical scheme for solving the above technical problems of the utility model is as follows:

[0006] A control device for controlling the flow of water pump, comprising an electronic flowmeter, a schmitt trigger, a drive control unit, an electric control selection switch unit, a load unit, an alternating current transformer and a multi-voltage output power supply unit, wherein the load unit has a plurality of load resistors, and the load resistors of each load unit are not equal in value.

[0007] The input end of the alternating current transformer is connected to alternating current, the output end of the alternating current transformer is electrically connected with the input end of the multi-voltage output power supply unit, and the output end of the multi-voltage output power supply unit is respectively electrically connected with the power input end of the electronic flowmeter, the power input end of the schmitt trigger and the power input end of the drive control unit.

[0008] The signal output end of the electronic flowmeter is electrically connected with the signal input end of the schmitt trigger, the signal output end of the schmitt trigger is electrically connected with the enable input end of the drive control unit, the signal input end of the drive control unit is electrically connected with the output end of the multi-voltage output power supply unit, and the signal output end of the drive control unit is electrically connected with the selection control end of the electric control selection switch unit.

[0009] The electric control selection switch unit comprises a plurality of switch input ends and a switch output end, the plurality of switch input ends correspond to the plurality of load units one by one, one end of the plurality of load units is electrically connected with the output end of the alternating current transformer respectively, the other end of each load unit is electrically connected with the corresponding switch input end, and the switch output end is used for connecting the power input end of the pump motor of the water pump.

[0010] The utility model discloses beneficial effect is: through electronic flowmeter to monitor the output water flow of water pump, and the flow is converted into water flow electric signal, and the water flow electric signal is screened through schmitt trigger, when water flow electric signal exceeds certain threshold value, and schmitt trigger will output mutation high level voltage signal, and mutation high level voltage signal is enabled control to control drive control unit and carries out voltage conversion to the voltage of the output end output of multi-voltage output power unit, obtains control voltage signal, and the electric control selection switch unit is switched under the control of control voltage signal Electric control selection switch unit connection channel is switched to let pump motor connect to the load unit of different resistance value, thereby change pump motor's supply voltage, finally realize the change of pump motor's rotating speed, to realize when the water flow of water pump is too big, reduce water pump motor's supply voltage, to reduce water pump flow, prevent water resource waste.

[0011] On the basis of the above technical scheme, the utility model still can make following improvement.

[0012] Further, the schmitt trigger is a complementary metal oxide semiconductor schmitt trigger.

[0013] The beneficial effect of the above further scheme is that by using the complementary metal oxide semiconductor schmitt trigger, low power consumption and high noise tolerance are achieved, and when the input voltage signal reaches the preset threshold value, the output voltage is mutated to output a relatively stable high level voltage, thereby improving the signal detection accuracy.

[0014] Further, the utility model still includes signal amplification unit, the output end of alternating current transformer is electrically connected with the power input end of signal amplification unit, the signal output end of schmitt trigger is electrically connected with the signal input end of signal amplification unit, and the signal output end of signal amplification unit is electrically connected with the enable input end of drive control unit.

[0015] Further, the signal amplification unit comprises a first resistor, a second resistor, a third resistor and an operational amplifier, one end of the third resistor is electrically connected with the signal output end of the Schmitt trigger, the other end of the third resistor is electrically connected with the non-inverting input end of the operational amplifier, the inverting input end of the operational amplifier is electrically connected with one end of the first resistor and one end of the second resistor respectively, the other end of the first resistor is electrically connected with the output end of the operational amplifier, the other end of the second resistor is grounded, and the output end of the operational amplifier is electrically connected with the enable input end of the drive control unit.

[0016] The beneficial effect of the above further scheme is that a same-direction signal amplifier is formed by the first resistor, the second resistor, the third resistor and the operational amplifier, the signal output by the Schmitt trigger is amplified, the enable control voltage signal of the drive control unit can be reached, and the drive control capability is improved.

[0017] Further, the load unit has two, and the two load units are a first load unit and a second load unit respectively, the resistance value of the first load unit is smaller than that of the second load unit.

[0018] The electrically controlled selection switch unit comprises an electromagnetic relay, one end of the electromagnetic coil of the electromagnetic relay is electrically connected with the signal output end of the drive control unit, the other end of the electromagnetic coil of the electromagnetic relay is grounded, the output end of the alternating current transformer is electrically connected with one end of the first load unit and one end of the second load unit respectively, the other end of the first load unit is electrically connected with one end of the normally closed contact of the electromagnetic relay, the other end of the second load unit is electrically connected with one end of the normally open contact of the electromagnetic relay, and the other end of the normally closed contact of the electromagnetic relay and the other end of the normally open contact of the electromagnetic relay are electrically connected with the switch output end.

[0019] The beneficial effect of the above further scheme is that the electromagnetic relay is used to control the selection of the load connected to the pump motor, when the flow of the water pump is too high, the voltage signal output by the electronic flowmeter makes the voltage of the Schmitt trigger suddenly change, a sudden voltage signal is output, the sudden voltage signal controls the drive control unit to output a drive voltage signal, the drive voltage signal makes the electromagnetic coil of the electromagnetic relay be electrified, after the electromagnetic coil of the electromagnetic relay is electrified, the normally open contact of the electromagnetic relay is connected, the normally closed contact is disconnected, the pump motor is connected to the power supply through the second load unit, after the load resistance of the pump motor is improved, the drive voltage of the pump motor is reduced, so that the rotating speed of the pump motor is reduced, and finally the flow of the water pump is reduced.

[0020] Furthermore, the drive control unit includes a fourth resistor, a transistor, a fifth resistor, a sixth resistor, a seventh resistor and a MOS transistor; one end of the fourth resistor is electrically connected to the signal output end of the Schmitt trigger, the other end of the fourth resistor is electrically connected to the base of the transistor, one end of the fifth resistor is electrically connected to the emitter of the transistor, the other end of the fifth resistor is grounded, one end of the sixth resistor is electrically connected to the output end of the multi-voltage output power supply unit, the other end of the sixth resistor is electrically connected to the collector of the transistor, the emitter of the transistor is electrically connected to the gate of the MOS transistor, one end of the seventh resistor is electrically connected to the output end of the multi-voltage output power supply unit, the other end of the seventh 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 electromagnetic relay.

[0021] The beneficial effect of adopting the above further scheme is that when the signal output end of the Schmitt trigger outputs a high-level signal, the collector of the transistor is a high-level voltage, the transistor is turned on, the gate voltage of the MOS tube is the voltage across the fifth resistor, the MOS tube is also turned on, and the output 12V or 24V voltage of the multi-voltage output power supply unit passes through the seventh resistor to power the electromagnetic coil of the electromagnetic relay, so that the electromagnetic coil of the electromagnetic relay is magnetized, the normally open contact of the electromagnetic relay is connected, and the normally closed contact of the electromagnetic relay is disconnected.

[0022] Furthermore, the multi-voltage output power supply unit is a multi-channel output AC-DC voltage conversion module.

[0023] Furthermore, the Schmitt trigger is a transistor logic level Schmitt trigger.

[0024] The beneficial effect of adopting the above further solution is that the transistor logic level Schmitt trigger has a high driving capability and can directly control the driving control unit without amplifying the output signal of the Schmitt trigger.

[0025] Furthermore, it also includes an audible and visual alarm unit, which includes a positive pole and a negative pole. The positive pole of the audible and visual alarm unit is electrically connected to the signal output end of the drive control unit, and the negative pole of the audible and visual alarm unit is grounded.

[0026] Furthermore, the sound and light alarm unit includes a light emitting diode and a speaker, the positive pole of the light emitting diode is electrically connected to the signal output end of the drive control unit, the negative pole of the light emitting diode is electrically connected to the positive pole of the speaker, and the negative pole of the speaker is grounded.

[0027] The beneficial effect of adopting the above further solution is that, by providing a light-emitting diode and a speaker, light can be emitted and an audible alarm can be sounded after the water pump flow exceeds a threshold value. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Circuit structure diagram of the utility model Figure One ;

[0029] Figure 2 Circuit structure diagram of the utility model Figure Two ;

[0030] Figure 3 Circuit structure diagram of the utility signal amplification unit

[0031] Figure 4 Circuit structure diagram of the utility drive control unit

[0032] Figure 5 Structure diagram of the utility electric control selection switch unit

[0033] Figure 6 Circuit structure diagram of the utility sound and light alarm unit DETAILED DESCRIPTION

[0034] The principles and features of the utility model are described below in conjunction with the drawings, and the examples are only used to explain the utility model and not to limit the scope of the utility model.

[0035] As shown in Figure 1 , the utility model provides a control device for controlling water pump flow, which comprises an electronic flowmeter, a Schmitt trigger, a drive control unit, an electric control selection switch unit, a load unit, an alternating current transformer and a multi-voltage output power supply unit, wherein the load unit has multiple load units, and the load resistance values of each load unit are not equal.

[0036] The input end of the alternating current transformer is connected to alternating current, the output end of the alternating current transformer is electrically connected to the input end of the multi-voltage output power supply unit, and the output end of the multi-voltage output power supply unit is respectively electrically connected to the power input end of the electronic flowmeter, the power input end of the Schmitt trigger and the power input end of the drive control unit; the alternating current can be directly provided by the power grid or provided by the generator.

[0037] The signal output end of the electronic flowmeter is electrically connected to the signal input end of the Schmitt trigger, the signal output end of the Schmitt trigger is electrically connected to the enable input end of the drive control unit, the signal input end of the drive control unit is electrically connected to the output end of the multi-voltage output power supply unit, and the signal output end of the drive control unit is electrically connected to the selection control end of the electric control selection switch unit.

[0038] The electric control selection switch unit comprises a plurality of switch input ends and a switch output end, the plurality of switch input ends correspond to the plurality of load units one by one, the output end of the AC transformer is electrically connected with one end of the plurality of load units respectively, the other end of each load unit is electrically connected with the corresponding switch input end, and the switch output end is used for connecting the power input end of the pump motor of the water pump.

[0039] Specifically, the multi-voltage output power supply unit is a multi-output AC-DC voltage conversion module.

[0040] The multi-output DC-DC voltage conversion module can be an AC-DC converter with a model number of LNK364DN-TL SOP7. The converter can output DC voltages of 5V, 12V and 24V.

[0041] In some embodiments, the Schmitt trigger is a complementary metal oxide semiconductor Schmitt trigger. By using a complementary metal oxide semiconductor Schmitt trigger, low power consumption and high noise tolerance are achieved, and when the input voltage signal reaches a preset threshold, the output voltage changes abruptly to output a more stable high-level voltage, thereby improving signal detection accuracy.

[0042] As shown in Figure 2 The signal amplification unit is electrically connected with the output end of the AC transformer and the signal input end of the Schmitt trigger, and the signal output end of the signal amplification unit is electrically connected with the enable input end of the drive control unit.

[0043] As shown in Figure 3 The signal amplification unit comprises a first resistor R1, a second resistor R2, a third resistor R3 and an operational amplifier U1, one end of the third resistor R3 is electrically connected with the signal output end of the Schmitt trigger, the other end of the third resistor R3 is electrically connected with the non-inverting input end of the operational amplifier U1, the inverting input end of the operational amplifier U1 is electrically connected with one end of the first resistor R1 and one end of the second resistor R2 respectively, the other end of the first resistor R1 is electrically connected with the output end of the operational amplifier U1, the other end of the second resistor R2 is grounded, and the output end of the operational amplifier U1 is electrically connected with the enable input end of the drive control unit. The first resistor R1, the second resistor R2, the third resistor R3 and the operational amplifier U1 constitute a same-direction signal amplifier, which amplifies the signal output by the Schmitt trigger to achieve the enable control voltage signal of the drive control unit, thereby improving the drive control capability.

[0044] The positive electrode of the power input end of the operational amplifier U1 is electrically connected with the input end of the multi-voltage output power supply unit, and the negative electrode of the power input end of the operational amplifier U1 is grounded. The amplification formula of the signal amplification unit is: Vo=Vp(1+R1 / R2); Vo is the output voltage of the signal amplification unit, Vp is the input voltage of the signal amplification unit, i.e. the output voltage of the Schmitt trigger, R1 is the resistance value of the first resistor R1, and R2 is the resistance value of the second resistor R2.

[0045] As shown in Figure 4 The driving control unit includes a fourth resistor R4, a triode Q1, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and a MOS tube Q2. One end of the fourth resistor R4 is electrically connected with the signal output end of the Schmitt trigger, the other end of the fourth resistor R4 is electrically connected with the base of the triode Q1, one end of the fifth resistor R5 is electrically connected with the emitter of the triode Q1, the other end of the fifth resistor R5 is grounded, one end of the sixth resistor R6 is electrically connected with the output end of the multi-voltage output power supply unit, the other end of the sixth resistor R6 is electrically connected with the collector of the triode Q1, the emitter of the triode Q1 is electrically connected with the gate of the MOS tube Q2, one end of the seventh resistor R7 is electrically connected with the output end of the multi-voltage output power supply unit, the other end of the seventh resistor R7 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 of the electromagnetic relay K1. When the signal output end of the Schmitt trigger outputs a high-level signal, the collector of the triode Q1 is at a high-level voltage, the triode Q1 is turned on, the gate voltage of the MOS tube Q2 is the voltage across the fifth resistor R5, the MOS tube Q2 is also turned on, and the voltage of 12V or 24V output by the multi-voltage output power supply unit is supplied to the electromagnetic coil of the electromagnetic relay K1 after passing through the seventh resistor R7, so that the electromagnetic coil of the electromagnetic relay K1 is excited, the normally open contact of the electromagnetic relay K1 is turned on, and the normally closed contact of the electromagnetic relay K1 is turned off.

[0046] As shown in Figure 5 The load unit has two, which are a first load unit and a second load unit, and the resistance value of the first load unit is smaller than that of the second load unit.

[0047] The electric control selection switch unit comprises an electromagnetic relay K1, one end of an electromagnetic coil of the electromagnetic relay K1 is electrically connected with a signal output end of the drive control unit, the other end of the electromagnetic coil of the electromagnetic relay K1 is grounded, the output end of the alternating current transformer is electrically connected with one end of the first load unit and one end of the second load unit respectively, the other end of the first load unit is electrically connected with one end of a normally closed contact of the electromagnetic relay K1, the other end of the second load unit is electrically connected with one end of a normally open contact of the electromagnetic relay K1, the other end of the normally closed contact of the electromagnetic relay K1 and the other end of the normally open contact of the electromagnetic relay K1 are electrically connected with the switch output end. By adopting the electromagnetic relay to control the selection of the load of the pump motor, when the flow of the water pump is too high, the voltage signal output by the electronic flow meter makes the voltage of the Schmidt trigger jump, and outputs a sudden voltage signal, the sudden voltage signal controls the drive control unit to output a drive voltage signal, the drive voltage signal makes the electromagnetic coil of the electromagnetic relay K1 be electrified, after the electromagnetic coil of the electromagnetic relay K1 is electrified, the normally open contact of the electromagnetic relay K1 is connected, and the normally closed contact is disconnected, the pump motor is connected to the power supply through the second load unit, after the load resistance of the pump motor is improved, the drive voltage of the pump motor is reduced, so that the rotating speed of the pump motor is reduced, and finally the flow of the water pump is reduced.

[0048] In some embodiments, the Schmidt trigger is a transistor logic level Schmidt trigger. The transistor logic level Schmidt trigger is also called a TTL Schmidt trigger, the TTL Schmidt trigger adopts a TTL signal driving technology, the TTL level signal adopts binary representation data, wherein +5V is equivalent to logic "1", and 0V is equivalent to logic "0"; therefore, the TTL Schmidt trigger has high driving capacity, and the output signal of the TTL Schmidt trigger does not need to be amplified. When the Schmidt trigger is a transistor logic level Schmidt trigger, one end of the fourth resistor R4 of the drive control unit is directly electrically connected with the signal output end of the Schmidt trigger. The high level voltage output by the Schmidt trigger directly drives the triode Q1 to be turned on.

[0049] As Figure 6The alarm unit also includes a positive electrode and a negative electrode, the positive electrode of the alarm unit is electrically connected with the signal output end of the drive control unit, and the negative electrode of the alarm unit is grounded. Specifically, the alarm unit includes a light emitting diode D1 and a loudspeaker D2, the positive electrode of the light emitting diode D1 is electrically connected with the source electrode of the MOS tube Q2, the negative electrode of the light emitting diode D1 is electrically connected with the positive electrode of the loudspeaker D2, and the negative electrode of the loudspeaker D2 is grounded. By arranging the light emitting diode D1 and the loudspeaker D2, after the water pump flow exceeds the threshold value, the MOS tube Q2 is turned on, the source electrode voltage of the MOS tube Q2 drives the light emitting diode D1 to emit light and drives the loudspeaker D2 to emit a sound alarm.

[0050] The utility model discloses an embodiment through electronic flowmeter to monitor the output water flow of water pump, and the flow is converted into water flow electric signal, and the water flow electric signal is screened through schmitt trigger, and when the water flow electric signal exceeds certain threshold value, schmitt trigger will output mutation high level voltage signal, and mutation high level voltage signal is enabled control to control drive control unit voltage conversion is carried out to the voltage that the output end of multi -voltage output power unit exports, and control voltage signal is obtained, and the electric control selection switch unit is switched under the control of control voltage signal Electric control selection switch unit connection channel to let pump motor connect to the load unit of different resistance value, thereby change pump motor's supply voltage, finally realize the change of pump motor's rotating speed, to realize when the water flow of water pump is too big, reduce water pump motor's supply voltage, to reduce water pump flow, prevent water resource waste.

[0051] The above only is the preferred embodiment of the utility model, and does not use to limit the utility model, and any modification, equivalent replacement, improvement etc. that is made within the concept and principle of the utility model should be contained in the protection scope of the utility model.

Claims

1. A control device for controlling the flow rate of a water pump, characterized by: The utility model relates to an electronic flowmeter, a Schmitt trigger, a drive control unit, an electrically controlled selection switch unit, a load unit, an alternating current transformer and a multi-voltage output power supply unit, wherein the load unit has multiple load units, and the load resistance values of each load unit are not equal; An input end of the alternating current transformer is connected to an alternating current power supply, an output end of the alternating current transformer is electrically connected to an input end of the multi-voltage output power supply unit, and output ends of the multi-voltage output power supply unit are respectively electrically connected to a power supply input end of the electronic flowmeter, a power supply input end of the Schmitt trigger and a power supply input end of the drive control unit; A signal output end of the electronic flowmeter is electrically connected to a signal input end of the Schmitt trigger, a signal output end of the Schmitt trigger is electrically connected to an enable input end of the drive control unit, a signal input end of the drive control unit is electrically connected to an output end of the multi-voltage output power supply unit, and a signal output end of the drive control unit is electrically connected to a selection control end of the electrically controlled selection switch unit; The electrically controlled selection switch unit comprises multiple switch input ends and one switch output end, the multiple switch input ends correspond to the multiple load units one by one, the output end of the alternating current transformer is electrically connected to one end of each load unit, the other end of each load unit is electrically connected to the corresponding switch input end, and the switch output end is used for connecting a power supply access end of a pump motor of a water pump.

2. The control device for controlling the flow rate of a water pump according to claim 1, characterized by: The Schmitt trigger is a complementary metal oxide semiconductor Schmitt trigger.

3. The control device for controlling the flow rate of a water pump according to claim 2, characterized by: The utility model further comprises a signal amplification unit, an output end of the alternating current transformer is electrically connected to a power supply input end of the signal amplification unit, a signal output end of the Schmitt trigger is electrically connected to a signal input end of the signal amplification unit, and a signal output end of the signal amplification unit is electrically connected to an enable input end of the drive control unit.

4. The control device for controlling the flow rate of a water pump according to claim 3, characterized by: The signal amplification unit comprises a first resistor (R1), a second resistor (R2), a third resistor (R3) and an operational amplifier (U1), one end of the third resistor (R3) is electrically connected to a signal output end of the Schmitt trigger, the other end of the third resistor (R3) is electrically connected to a non-inverting input end of the operational amplifier (U1), an inverting input end of the operational amplifier (U1) is respectively electrically connected to one end of the first resistor (R1) and one end of the second resistor (R2), the other end of the first resistor (R1) is electrically connected to an output end of the operational amplifier (U1), the other end of the second resistor (R2) is grounded, and the output end of the operational amplifier (U1) is electrically connected to the enable input end of the drive control unit.

5. The control device for controlling the flow of a water pump according to claim 1, characterized in that: The load unit has two load units, namely a first load unit and a second load unit, and the resistance value of the first load unit is smaller than the resistance value of the second load unit. The electric control selection switch unit includes an electromagnetic relay (K1), one end of the electromagnetic coil of the electromagnetic relay (K1) is electrically connected with the signal output end of the drive control unit, the other end of the electromagnetic coil of the electromagnetic relay (K1) is grounded, the output end of the alternating current transformer is electrically connected with one end of the first load unit and one end of the second load unit respectively, the other end of the first load unit is electrically connected with one end of the normally closed contact of the electromagnetic relay (K1), the other end of the second load unit is electrically connected with one end of the normally open contact of the electromagnetic relay (K1), the other end of the normally closed contact of the electromagnetic relay (K1) and the other end of the normally closed contact of the electromagnetic relay (K1) are electrically connected with the switch output end.

6. The control device for controlling the flow rate of a water pump according to claim 5, characterized by: The drive control unit includes a fourth resistor (R4), a triode (Q1), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7) and a MOS tube (Q2), one end of the fourth resistor (R4) is electrically connected with the signal output end of the Schmitt trigger, the other end of the fourth resistor (R4) is electrically connected with the base of the triode (Q1), one end of the fifth resistor (R5) is electrically connected with the emitter of the triode (Q1), the other end of the fifth resistor (R5) is grounded, one end of the sixth resistor (R6) is electrically connected with the output end of the multi-voltage output power supply unit, the other end of the sixth resistor (R6) is electrically connected with the collector of the triode (Q1), the emitter of the triode (Q1) is electrically connected with the gate of the MOS tube (Q2), one end of the seventh resistor (R7) is electrically connected with the output end of the multi-voltage output power supply unit, the other end of the seventh resistor (R7) is electrically connected with the drain of the MOS tube (Q2), the source of the MOS tube (Q2) is electrically connected with one end of the electromagnetic coil of the electromagnetic relay (K1).

7. The control device for controlling the flow rate of a water pump according to claim 1, characterized by: The multi-voltage output power supply unit is a multi-path output AC-DC voltage conversion module.

8. The control device for controlling the flow rate of a water pump according to claim 1, characterized by: The Schmitt trigger is a transistor logic level Schmitt trigger.

9. The control device for controlling the flow rate of a water pump according to claim 1, characterized by: An audible and visual alarm unit is further included, the audible and visual alarm unit includes a positive electrode and a negative electrode, the positive electrode of the audible and visual alarm unit is electrically connected with the signal output end of the drive control unit, and the negative electrode of the audible and visual alarm unit is grounded.

10. The control device for controlling the flow rate of a water pump according to claim 9, characterized by: The audible and visual alarm unit includes a light emitting diode (D1) and a loudspeaker (D2), the positive electrode of the light emitting diode (D1) is electrically connected with the signal output end of the drive control unit, the negative electrode of the light emitting diode (D1) is electrically connected with the positive electrode of the loudspeaker (D2), and the negative electrode of the loudspeaker (D2) is grounded.

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