CN212695706U - Single-phase pump protection circuit - Google Patents
Single-phase pump protection circuit Download PDFInfo
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- CN212695706U CN212695706U CN202021484869.5U CN202021484869U CN212695706U CN 212695706 U CN212695706 U CN 212695706U CN 202021484869 U CN202021484869 U CN 202021484869U CN 212695706 U CN212695706 U CN 212695706U
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- phase pump
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Abstract
The utility model relates to a single-phase pump protection circuit, including three phase current, single-phase pump, major loop and control circuit, the single-phase pump passes through major loop and connects three phase current, is provided with control circuit between single-phase pump and the major loop, control circuit is used for assisting the major loop and carries out single-phase pump overcurrent, overload protection, the major loop includes circuit breaker and contactor, the circuit breaker is thermomagnetic circuit breaker, control circuit includes fuse and change over switch, change over switch's contact and contactor coil connection, the single-phase pump is connected with circuit breaker and three phase current through the contactor. The utility model discloses be provided with major loop and control circuit, be provided with three-phase protection electrical accessories on the major loop, through being connected the back with the single-phase pump, when taking place to overflow, transship, control circuit and major loop form the protection to the single-phase pump.
Description
Technical Field
The utility model relates to an electrical protection field, concretely relates to single-phase pump protection return circuit.
Background
At present, the overcurrent and overload protection of the industrial single-phase water pump is mainly realized by adding a pressure sensor at the outlet of the water pump to protect the water pump, the method needs to be matched with a peripheral circuit for driving, three-phase power supply use occasions are more in industrial production, and a single-phase water pump protection circuit is inconvenient for system integration and control;
meanwhile, for the application of the single-phase water pump under a three-phase power supply, no overcurrent and overload protection electric fittings which are matched with the single-phase water pump and have a thermomagnetic tripping function are arranged on the market, and most of the existing methods are to directly connect the single-phase water pump with one of the three-phase power supply and then connect a zero line to form a single-phase loop, so that safety accidents and damage to electrical equipment are easily caused by the connection method.
Disclosure of Invention
The utility model discloses a solve after single-phase water pump inserts three phase current, do not have the problem that relay protection device easily caused equipment to damage when taking place to overflow, overload the problem, provide a single-phase pump protection return circuit, be provided with major loop and control circuit, be provided with three-phase protection electrical accessories on the major loop, through being connected the back with single-phase pump, when taking place to overflow, overload, control circuit and major loop form the protection to single-phase pump.
In order to realize the purpose, the technical scheme of the utility model is that:
the utility model provides a single-phase pump protection circuit, includes three phase current, single-phase pump, major loop and control circuit, the single-phase pump passes through major loop and connects three phase current, is provided with control circuit between single-phase pump and the major loop, control circuit is used for assisting the major loop and carries out single-phase pump overcurrent, overload protection, the major loop includes circuit breaker and contactor, the circuit breaker is the thermomagnetic circuit breaker, control circuit includes fuse and change over switch, change over switch's contact and contactor coil connection, the single-phase pump is connected through contactor and circuit breaker and three phase current.
Furthermore, the circuit breaker comprises a first wiring terminal, a second wiring terminal and a third wiring terminal, outgoing lines of the first wiring terminal, the second wiring terminal and the third wiring terminal are respectively connected with a normally open contact of the contactor, the first wiring terminal is connected with a live wire, the outgoing lines of the first wiring terminal are connected with outgoing lines of the second wiring terminal in series through the normally open contact of the contactor, the second wiring terminal and the third wiring terminal are connected in series, and the outgoing lines of the third wiring terminal are connected with a single-phase pump.
Furthermore, the other end of the single-phase pump is connected with a zero line to form a loop, and a grounding wire of the single-phase pump is connected with a grounding point.
Furthermore, the change-over switch is used for controlling the start and stop of the single-phase pump, the change-over switch is connected with a live wire of a three-phase power supply, a fuse and a normally closed auxiliary contact of a breaker are connected in series between the change-over switch and the three-phase power supply, a wire outlet end of the change-over switch is connected with a coil of the contactor, and the coil of the contactor is connected with a power supply zero line to form a loop.
Through the technical scheme, the beneficial effects of the utility model are that:
the utility model discloses be provided with major loop and control circuit, control circuit is used for assisting the major loop and carries out single-phase pump overcurrent, overload protection, the major loop includes circuit breaker and contactor, the circuit breaker is the thermomagnetic circuit breaker, control circuit includes fuse and change over switch, change over switch's contact is connected with the contactor coil, the single-phase pump is connected with circuit breaker and three-phase power supply through the contactor;
when overload and overcurrent problems occur, current passes through a detection coil of the circuit breaker to generate a magnetic field to unlock the overcurrent tripping device, and the tripping device breaks a circuit under the action of spring force to realize overload and overcurrent protection.
Meanwhile, under the conditions of overcurrent and overload, the normally closed auxiliary contact of the circuit breaker is disconnected, the power is switched on and off, the coil of the contactor is enabled to lose power, and the normally open contact of the contactor is disconnected, so that the single-phase pump is protected from power failure.
Drawings
Fig. 1 is an electrical schematic diagram of a single-phase pump protection circuit of the present invention.
The reference numbers in the figures are: 1 is a single-phase pump, 2 is a circuit breaker, 3 is a contactor, 4 is a change-over switch, and 5 is a fuse.
Detailed Description
The invention will be further explained with reference to the drawings and the detailed description below:
as shown in fig. 1, a single-phase pump protection circuit, including three-phase power, single-phase pump 1, major loop and control circuit, single-phase pump 1 connects three-phase power through the major loop, is provided with control circuit between single-phase pump 1 and the major loop, control circuit is used for assisting the major loop to carry out single-phase pump 1 overcurrent, overload protection, the major loop includes circuit breaker and contactor 3, circuit breaker 2 is the thermomagnetic circuit breaker, control circuit includes fuse 5 and change over switch 4, change over switch 4's contact and contactor 3 coil connection, single-phase pump 1 is connected with circuit breaker and three-phase power through contactor 3.
For simplifying circuit structure and being convenient for wiring and maintenance, circuit breaker 2 includes first wiring end, second wiring end and third wiring end, the line outgoing of first wiring end, second wiring end and third wiring end is connected with the normally open contact of contactor 3 respectively, first wiring end is connected with the live wire, the line outgoing of first wiring end is established ties with the being qualified for the next round of competitions of second wiring end through the normally open contact of contactor 3, establish ties between second wiring end and the third wiring end, the connection single-phase pump 1 of being qualified for the next round of competitions of third wiring end. The other end of the single-phase pump 1 is connected with a zero line to form a loop, and a grounding wire of the single-phase pump 1 is connected with a grounding point.
In order to achieve a double protection effect on the single-phase pump 1, the change-over switch 4 is used for controlling the start and stop of the single-phase pump 1, the change-over switch 4 is connected with a live wire of a three-phase power supply, a fuse 5 and a normally closed auxiliary contact of a breaker are connected in series between the change-over switch 4 and the three-phase power supply, a wire outlet end of the change-over switch 4 is connected with a coil of the contactor 3, and the coil of the contactor 3 is connected with a power supply zero line to form a loop.
As shown in fig. 1, A, B and C in the figure are live wires of a three-phase power supply, N is a zero wire, PE is a ground wire, in this embodiment, a single-phase pump 1 is wired by taking a phase C as an example, the circuit breaker 2 is a three-phase thermomagnetic circuit breaker commonly used in a three-phase power supply system, a first terminal, a second terminal, a third terminal and a normally closed auxiliary contact (marked with a reference number QF7 in the figure) of the circuit breaker 2 are connected, the normally closed auxiliary contact is a fault contact and is disconnected when an overcurrent or overload condition occurs, the first terminal, the second terminal and the third terminal share 6 contacts, wherein the 1, 3 and 5 contacts are wired with the phase C (marked with a reference number L1 in the figure), the 2, 4 and 6 contacts are connected with a normally open contact of a contactor 3, the 3 and 5 contacts are connected in series, the 2 and 4 contacts are connected in series, and an outgoing line of the 6 contact is connected with the single-phase pump 1, the other wiring end of the single-phase pump 1 is connected with a zero line N to form a loop, and the wiring of the main loop of the single-phase pump 1 is finished;
in the control loop wiring, a change-over switch 4 (marked with a reference number SA in the figure) is connected with one of three-phase power supplies, a fuse 5 is connected between the change-over switch 4 and the one of the three-phase power supplies, and taking the phase C as an example, an outgoing line of the change-over switch 4 is connected with a zero line N through a coil of a contactor 3 to form a loop.
When overcurrent or overload problems occur in actual operation, firstly, on a main loop, current passes through the circuit breaker 2, a magnetic field is generated on a detection coil of the circuit breaker 2, the overcurrent tripping device is unlocked, the tripping device breaks a circuit under the action of spring force to realize overload and overcurrent protection, and the single-phase pump 1 is withdrawn from the system;
meanwhile, overcurrent flows to the fuse 5, the fuse 5 is fused due to overheating, the normally closed auxiliary contact of the circuit breaker 2 is broken, a control circuit is broken, the change-over switch 4 is protected, further, after the change-over switch 4 is powered off, the coil of the contactor 3 is powered off, the normally open contact of the contactor 3 is powered off, and wiring between the single-phase pump 1 and the circuit breaker 2 is cut off, so that overcurrent and overload damage of the single-phase pump 1 are avoided.
The above-described embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the invention, so that equivalent changes and modifications made to the structures, features and principles of the invention described in the claims should be included within the scope of the invention.
Claims (4)
1. The utility model provides a single-phase pump protection circuit, includes three phase current, single-phase pump (1), major loop and control circuit, its characterized in that, single-phase pump (1) connects three phase current through the major loop, is provided with control circuit between single-phase pump (1) and the major loop, control circuit is used for assisting the major loop and carries out single-phase pump (1) overcurrent, overload protection, the major loop includes circuit breaker (2) and contactor (3), circuit breaker (2) are thermomagnetic circuit breaker, control circuit includes fuse (5) and change over switch (4), the contact and contactor (3) coil connection of change over switch (4), single-phase pump (1) is connected with circuit breaker and three phase current through contactor (3).
2. The single-phase pump protection circuit according to claim 1, wherein the circuit breaker (2) comprises a first terminal, a second terminal and a third terminal, the outgoing lines of the first terminal, the second terminal and the third terminal are respectively connected with the normally open contact of the contactor (3), the first terminal is connected with the live line, the outgoing line of the first terminal is connected with the outgoing line of the second terminal in series through the normally open contact of the contactor (3), the second terminal and the third terminal are connected in series, and the outgoing line of the third terminal is connected with the single-phase pump (1).
3. The single-phase pump protection circuit according to claim 2, wherein the other end of the single-phase pump (1) is connected to a neutral line to form a circuit, and the ground line of the single-phase pump (1) is connected to the grounding point.
4. The single-phase pump protection circuit according to claim 3, wherein the transfer switch (4) is used for controlling the start and stop of the single-phase pump (1), the transfer switch (4) is connected with a live wire of a three-phase power supply, a fuse (5) and a normally closed auxiliary contact of the circuit breaker (2) are connected in series between the transfer switch (4) and the three-phase power supply, an outlet end of the transfer switch (4) is connected with a coil of the contactor (3), and the coil of the contactor (3) is connected with a power supply neutral wire to form a circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021484869.5U CN212695706U (en) | 2020-07-24 | 2020-07-24 | Single-phase pump protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021484869.5U CN212695706U (en) | 2020-07-24 | 2020-07-24 | Single-phase pump protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212695706U true CN212695706U (en) | 2021-03-12 |
Family
ID=74899492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021484869.5U Active CN212695706U (en) | 2020-07-24 | 2020-07-24 | Single-phase pump protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212695706U (en) |
-
2020
- 2020-07-24 CN CN202021484869.5U patent/CN212695706U/en active Active
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