CN219086793U - Water pump protection device - Google Patents
Water pump protection device Download PDFInfo
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- CN219086793U CN219086793U CN202223231288.2U CN202223231288U CN219086793U CN 219086793 U CN219086793 U CN 219086793U CN 202223231288 U CN202223231288 U CN 202223231288U CN 219086793 U CN219086793 U CN 219086793U
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Abstract
A protection device of a water pump comprises a water-break detection unit, a motor open-phase detection unit and a control unit; the output end of the water-break detection unit and the output end of the motor open-phase detection unit are connected with the input end of the control unit, and when the water-break detection unit detects that the water pump is broken or the motor open-phase detection unit detects that the motor is broken, the control unit cuts off the power supply of the motor. The water pump has the beneficial effects that the water outlet condition of the water pump can be automatically detected, whether the water pump motor is out of phase or not can be automatically detected, and when the water pump is out of phase or the water pump motor is out of phase, the power supply of the water pump motor can be automatically cut off, so that the water pump and the motor are protected. The protection device of the water pump is reasonable in electric circuit arrangement and reliable in operation.
Description
Technical Field
The utility model relates to a protection device of water pump, this protection device comprises electrical component.
Background
The common failure of the water pump in the operation process is that the water pump does not discharge water or the motor is out of phase, so that a protection device of the water pump is necessary to be provided to ensure the safe operation of the water pump.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a protection device of a water pump, which can automatically stop the operation of the water pump when the water pump does not discharge water or the motor fails to phase, so as to avoid the damage of the water pump or the motor.
The technical scheme of the utility model is that the protection device of the water pump comprises a water-break detection unit, a motor phase-break detection unit and a control unit;
the water-break detection unit is characterized by comprising a transformer BK, a conductive electrode DJ inserted in a water outlet pipe of a water pump, a first bridge rectifier QL1 and a comparator A1, wherein the primary side of the transformer BK is connected between an A-phase input end and a B-phase input end of a motor MD in a bridging way, one end of the secondary side of the transformer BK is connected with a first node a through a resistor R1, the first node a is connected with one end of the conductive electrode DJ, the other end of the conductive electrode DJ is connected with a second node B, the other end of the secondary side of the transformer BK is connected with a second node B, the input end of the bridge rectifier QL1 is respectively connected with the first node a and the second node B, the positive electrode of the output end of the bridge rectifier QL1 is connected with a third node C, the third node C is grounded through an electrolytic capacitor C1, the inverting input end of the comparator A1 is connected with the third node C through a resistor R2, the non-inverting input end of the comparator A1 is connected with a direct current power supply through a resistor R3, and the non-inverting input end of the comparator A1 is grounded through a resistor R4;
the motor open-phase detection unit comprises a current transformer DL, a comparator A2 and a comparator A3, wherein the primary of the current transformer DL is connected in series with the C-phase input end of the motor MD, the secondary of the current transformer DL is connected with a resistor R in parallel, the secondary of the current transformer DL is connected with the input end of a bridge rectifier QL2 in parallel, the positive electrode of the output end of the bridge rectifier QL2 is connected with a fourth node d, the negative electrode of the output end of the bridge rectifier QL2 is grounded, the fourth node d is grounded through an electrolytic capacitor C2, the inverting input end of the comparator A2 is connected with a fourth node d through a resistor R5, the non-inverting input end of the comparator A2 is connected with a direct current power supply VDD through a resistor R6, and the non-inverting input end of the comparator A2 is grounded through a resistor R7;
the non-inverting input end of the comparator A3 is connected with the fourth node d through a resistor R8, the inverting input end of the comparator A3 is connected with a direct current power supply VDD through a resistor R9, and the inverting input end of the comparator A3 is grounded through a resistor R10;
the control unit comprises an AND gate IC1, an output end V1 of the comparator A1 is connected with a first input end X1 of the AND gate IC1, an output end V2 of the comparator A2 is connected with a second input end X2 of the AND gate IC1, an output end V3 of the comparator A3 is connected with a third input end X3 of the AND gate IC1, an output end Y1 of the AND gate IC1 is connected with a base electrode of the triode T1 through a resistor R11, an emitter electrode of the triode T1 is grounded, a collector electrode of the triode T1 is connected with a direct current power supply VDD through a coil J of a direct current relay, a collector electrode of the triode T1 is connected with an anode of the diode D1, a cathode of the diode D1 is connected with the direct current power supply VDD, a collector electrode of the triode T1 is grounded through a start key QA, one end of a normally open contact J2 of the direct current relay is connected with a B phase of mains supply, and the other end of the normally open contact J2 of the direct current relay is connected with a C phase of the mains supply through a coil J of the alternating current contactor, and the contact CJ1 of the alternating current contactor is connected in series between the three-phase power supply and an MD input end of the motor.
The utility model has the advantages that the water outlet condition of the water pump can be automatically detected, whether the water pump motor is out of phase can be automatically detected, and when the water pump is out of phase or the water pump motor is out of phase, the power supply of the water pump motor can be automatically cut off, so that the water pump and the motor are protected.
Drawings
Fig. 1 is a schematic circuit diagram of the present utility model.
Fig. 2 is an electrical schematic diagram of an ac contactor control circuit.
Detailed Description
A protection device of a water pump comprises a water-break detection unit, a motor open-phase detection unit and a control unit.
The water-break detection unit comprises a transformer BK, a conductive electrode DJ inserted in a water outlet pipe of the water pump, a first bridge rectifier QL1, a comparator A1, a resistor R1, an electrolytic capacitor C1, a resistor R2, a resistor R3 and a resistor R4.
The working principle of the water break detection unit is that a transformer BK provides an alternating current detection power supply for a conductive electrode DJ so as to prevent the conductive electrode DJ from being polarized, the secondary voltage of the transformer BK is about 0.5V, the conductive electrode DJ detects the conductivity of water, the conductivity is maximum (the corresponding resistance is minimum) when the conductive electrode is full of water, the conductivity is minimum (the corresponding resistance is maximum) when the conductive electrode is not full of water, a voltage dividing circuit is formed by a resistor R1 and the conductive electrode DJ, the secondary voltage of the transformer BK is divided, the voltage on the conductive electrode DJ is increased when the water break occurs, a bridge rectifier QL1 and an electrolytic capacitor C1 rectify and filter the voltage on the conductive electrode DJ, a resistor R3 and a resistor R4 provide a reference voltage for the comparator A1, the comparator A1 compares the conductive electrode DJ voltage with the reference voltage, the comparator A1 outputs a low level when the conductive electrode DJ voltage is larger than the reference voltage (in a water break state), and the comparator A1 outputs a high level when the electrode DJ voltage is smaller than the reference voltage (in a water state).
The motor open-phase detection unit comprises a current transformer DL, a comparator A2, a comparator A3, a resistor R, a bridge rectifier QL2, an electrolytic capacitor C2, a grounding resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a resistor R10.
The working principle of the motor open-phase detection unit is that a bridge rectifier QL2 and an electrolytic capacitor C2 rectify and filter the output voltage of a current transformer, a resistor R6 and a resistor R7 provide reference voltage for a comparator A2, the comparator A2 compares the output voltage of the current transformer with the reference voltage, when an A-phase winding or a B-phase winding of a motor MD is disconnected, the output voltage of the current transformer is larger than the reference voltage, the comparator A2 outputs a low level, and when the A-phase winding or the B-phase winding of the motor MD is normal, the output voltage of the current transformer is smaller than the reference voltage, and the comparator A2 outputs a high level; the resistor R9 and the resistor R10 provide reference voltages for the comparator A3, the comparator A3 compares the output voltage of the current transformer with the reference voltages, when the C-phase winding of the motor MD is disconnected, the output voltage of the current transformer is smaller than the reference voltages, the comparator A3 outputs low level, when the C-phase winding of the motor MD is normal, the output voltage of the current transformer is larger than the reference voltages, and the comparator A3 outputs high level; the motor open-phase detection unit is characterized in that a current transformer is adopted to sample the motor current, so that the current structure can be simplified.
The control unit comprises an AND gate IC1, a resistor R11, a triode T1, a direct current relay and an alternating current contactor, and the working principle is that when the water pump outputs water and the motor is normal, output signals of the comparator A1, the comparator A2 and the comparator A3 are all in high level, the output end Y1 of the AND gate IC1 outputs high level, the triode T1 is conducted, a normally open contact J2 of the direct current relay is closed, a coil CJ of the alternating current contactor is electrified, a contact CJ1 of the alternating current contactor is closed, when the water pump is disconnected or the motor is disconnected, at least one of output signals of the comparator A1, the comparator A2 and the comparator A3 is in low level, the output end Y1 of the AND gate IC1 outputs low level (the logic expression of the AND gate IC1 is that Y1=X1×X2×X3), the triode T1 is cut off, the normally open contact J2 of the direct current relay is disconnected, the coil CJ of the alternating current contactor is electrified, and the contact CJ1 of the alternating current contactor is disconnected, and the motor is disconnected.
The operation method of the protection device of the water pump is that the DC power supply VDD is turned on, the starting key QA is pressed, the coil of the DC relay is electrified, the normally open contact J2 of the DC relay is closed, the AC contactor coil releases the starting key QA after the water pump normally discharges water, thus the false action caused by the starting current of the motor and the fact that the water does not enter the conductive electrode can be prevented, because the starting current is larger than the phase-failure current, and the water does not reach the conductive electrode when the water pump is started. The direct current power supply VDD is disconnected, the normally open contact J2 of the direct current relay is disconnected, the contact CJ1 of the alternating current contactor is disconnected, and the motor is stopped.
In order to facilitate starting, namely, after the water pump normally discharges water, the starting key QA is not required to be loosened, the protection device of the water pump further comprises a starting unit, the starting unit comprises a comparator A4, the non-inverting input end of the comparator A4 is grounded through a resistor R12, the non-inverting input end of the comparator A4 is connected with the cathode of an electrolytic capacitor C3, the anode of the electrolytic capacitor C3 is connected with a direct current power supply VDD through a normally open contact JI of a direct current relay, the inverting input end of the comparator A4 is grounded through a resistor R15, the inverting input end of the comparator A4 is connected with the direct current power supply VDD through a resistor R14, the output end of the comparator A4 is connected with the base electrode of a triode T2 through a resistor R16, the collector electrode of the triode T2 is connected with the collector electrode of the triode T1, the emitter electrode of the triode T2 is grounded, the anode of the electrolytic capacitor C3 is connected with the anode of a diode D2, and the cathode of the diode D2 is connected with the direct current power supply VDD.
The starting unit has the working principle that a starting key QA is clicked, a normally open contact J1 and a normally open contact J2 of a direct current relay are closed, a motor is started, the voltage of an electrolytic capacitor C3 is zero when the normally open contact J2 is just closed, the voltage of a resistor R12 is maximum, the voltage of the resistor R12 gradually drops along with the charging of a direct current power supply VDD to the electrolytic capacitor C3 through the normally open contact J1, when the voltage of the resistor R12 is smaller than the voltage of an inverting input end of a comparator A4, the output end of the comparator A4 is in a low level, a triode T4 is cut off, and the control unit acts to protect a water pump. The voltage dropping speed of the resistor R12 is related to the capacity of the electrolytic capacitor C3 and the resistance value of the resistor R12, the larger the capacity of the electrolytic capacitor C3 and the resistance value of the resistor R12 are, the slower the voltage dropping speed of the resistor R12 is, the longer the time required for the output end of the comparator A4 to become low level is, and the conduction time of the triode T4 is slightly longer than the time required for starting the water pump by selecting the capacity of the electrolytic capacitor C3 and the resistance value of the resistor R12, so that misoperation in the starting process can be avoided; the diode D2 in the start-up unit functions to discharge the electrolytic capacitor C3 after the dc power supply VDD is turned off.
Claims (2)
1. The protection device of the water pump comprises a water failure detection unit, a motor open-phase detection unit and a control unit;
the water-break detection unit is characterized by comprising a transformer BK, a conductive electrode DJ inserted in a water outlet pipe of a water pump, a first bridge rectifier QL1 and a comparator A1, wherein the primary side of the transformer BK is connected between an A-phase input end and a B-phase input end of a motor MD in a bridging way, one end of the secondary side of the transformer BK is connected with a first node a through a resistor R1, the first node a is connected with one end of the conductive electrode DJ, the other end of the conductive electrode DJ is connected with a second node B, the other end of the secondary side of the transformer BK is connected with a second node B, the input end of the bridge rectifier QL1 is respectively connected with the first node a and the second node B, the positive electrode of the output end of the bridge rectifier QL1 is connected with a third node C, the third node C is grounded through an electrolytic capacitor C1, the inverting input end of the comparator A1 is connected with the third node C through a resistor R2, the non-inverting input end of the comparator A1 is connected with a direct current power supply through a resistor R3, and the non-inverting input end of the comparator A1 is grounded through a resistor R4;
the motor open-phase detection unit comprises a current transformer DL, a comparator A2 and a comparator A3, wherein the primary of the current transformer DL is connected in series with the C-phase input end of the motor MD, the secondary of the current transformer DL is connected with a resistor R in parallel, the secondary of the current transformer DL is connected with the input end of a bridge rectifier QL2 in parallel, the positive electrode of the output end of the bridge rectifier QL2 is connected with a fourth node d, the negative electrode of the output end of the bridge rectifier QL2 is grounded, the fourth node d is grounded through an electrolytic capacitor C2, the inverting input end of the comparator A2 is connected with a fourth node d through a resistor R5, the non-inverting input end of the comparator A2 is connected with a direct current power supply VDD through a resistor R6, and the non-inverting input end of the comparator A2 is grounded through a resistor R7;
the non-inverting input end of the comparator A3 is connected with the fourth node d through a resistor R8, the inverting input end of the comparator A3 is connected with a direct current power supply VDD through a resistor R9, and the inverting input end of the comparator A3 is grounded through a resistor R10;
the control unit comprises an AND gate IC1, an output end V1 of the comparator A1 is connected with a first input end X1 of the AND gate IC1, an output end V2 of the comparator A2 is connected with a second input end X2 of the AND gate IC1, an output end V3 of the comparator A3 is connected with a third input end X3 of the AND gate IC1, an output end Y1 of the AND gate IC1 is connected with a base electrode of the triode T1 through a resistor R11, an emitter electrode of the triode T1 is grounded, a collector electrode of the triode T1 is connected with a direct current power supply VDD through a coil J of a direct current relay, a collector electrode of the triode T1 is connected with an anode of the diode D1, a cathode of the diode D1 is connected with the direct current power supply VDD, a collector electrode of the triode T1 is grounded through a start key QA, one end of a normally open contact J2 of the direct current relay is connected with a B phase of mains supply, and the other end of the normally open contact J2 of the direct current relay is connected with a C phase of the mains supply through a coil J of the alternating current contactor, and the contact CJ1 of the alternating current contactor is connected in series between the three-phase power supply and an MD input end of the motor.
2. The water pump protection device according to claim 1, further comprising a starting unit, wherein the starting unit comprises a comparator A4, the non-inverting input end of the comparator A4 is grounded through a resistor R12, the non-inverting input end of the comparator A4 is connected with the cathode of the electrolytic capacitor C3, the anode of the electrolytic capacitor C3 is connected with the direct current power supply VDD through a normally open contact JI of the direct current relay, the inverting input end of the comparator A4 is grounded through a resistor R15, the inverting input end of the comparator A4 is connected with the direct current power supply VDD through a resistor R14, the output end of the comparator A4 is connected with the base of the triode T2 through a resistor R16, the collector of the triode T2 is connected with the collector of the triode T1, the emitter of the triode T2 is grounded, the anode of the electrolytic capacitor C3 is connected with the anode of the diode D2, and the cathode of the diode D2 is connected with the direct current power supply VDD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223231288.2U CN219086793U (en) | 2022-12-04 | 2022-12-04 | Water pump protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223231288.2U CN219086793U (en) | 2022-12-04 | 2022-12-04 | Water pump protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219086793U true CN219086793U (en) | 2023-05-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223231288.2U Active CN219086793U (en) | 2022-12-04 | 2022-12-04 | Water pump protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219086793U (en) |
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2022
- 2022-12-04 CN CN202223231288.2U patent/CN219086793U/en active Active
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