Leakage protection module for molded case circuit breaker

Abstract

The electric leakage protection module comprises a thermomagnetic module, a mutual inductor module, an execution mechanism, a control module and a base, the mutual inductor module is fixedly connected with the base, the thermomagnetic module is fixedly connected with one side of the mutual inductor module, the execution mechanism is arranged above the mutual inductor module and fixedly connected with the mutual inductor module, and the control module is arranged on the base. The control module is arranged above the mutual inductor module and fixedly connected with the mutual inductor module, meanwhile, the control module is connected with the mutual inductor module through an electric wire, and the control module is connected with the executing mechanism through an electric wire. Compared with the prior art, the functions of overload protection, short circuit protection, electric leakage protection and the like of the circuit breaker are integrated in the electric leakage protection module and are arranged in the integrated thermomagnetic electric leakage circuit breaker, and compared with an existing thermomagnetic electric leakage product, the integrated thermomagnetic electric leakage circuit breaker is more reasonable and easier to assemble, more beneficial to assembly work of an automatic production line and better in inter-phase insulation performance.

Description

Technical Field

[0001] The invention relates to a, and in particular to, a leakage protection module for a molded case circuit breaker. Background Art

[0002] The leakage protection module is an important part of the circuit breaker. It can detect whether there is leakage or other faults in the circuit and trip the circuit breaker in time to achieve the function of protecting the circuit. The existing circuit breakers with leakage protection function have loose and complex structures, which are not conducive to product installation and occupy a large internal volume of the circuit breaker.

[0003] Patent CN218215158U discloses a leakage protection module, including a second housing, in which a leakage detection circuit and a leakage tripping mechanism driven by the leakage detection circuit are installed, the leakage detection circuit includes two wiring terminals and a zero-sequence transformer, and the leakage detection circuit also includes at least one wiring piece, one end of at least one wiring piece is connected to the wiring terminal, and the other end passes through the threading hole of the zero-sequence transformer to form a plug-in piece, and the plug-in piece is arranged opposite to the second wiring port on the side wall of the second housing. A modular leakage protection module is adopted, and the wiring piece connected to the wiring terminal forms a plug-in piece, so that the leakage protection module can be connected to the circuit breaker pole by plug-in, and draw power from the main circuit of the circuit breaker pole, so as to replace the existing technology of connecting the leakage protection module and the circuit breaker pole by wire, which is conducive to realizing the automatic assembly of the leakage protection module and the circuit breaker pole, and conforms to the modular development of the circuit breaker. However, it is impossible to integrate the overload protection, short circuit protection and leakage protection functions of the circuit breaker into the leakage protection module. Summary of the invention

[0004] The purpose of the present invention is to provide a leakage protection module for a molded case circuit breaker in order to overcome the defects of the prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] The present invention provides a leakage protection module for a molded case circuit breaker, comprising a thermal magnetic module, a mutual inductor module, an actuator, a control module, and a base;

[0007] The transformer module is fixedly connected to the base; the thermal magnetic module is fixedly connected to one side of the transformer module; the actuator is arranged above the transformer module and fixedly connected to the transformer module; the control module is arranged above the transformer module and fixedly connected to the transformer module, and at the same time, the control module is connected to the transformer module through wires, and the control module is connected to the actuator through wires.

[0008] Furthermore, the thermal magnetic module includes an A yoke, a B yoke, a metal element and an armature. Two A holes are respectively provided on the A yoke, the B yoke, the metal element and the armature. The metal element is a metal sheet. The metal sheet will slowly bend forward when heated. The metal element is provided with screws. The A yoke and the B yoke refer to two magnetic circuit brackets in the magnetic circuit, which are used to fix and support the magnetic element in the magnetic circuit. The A yoke and the B yoke are used to provide a closed path for the magnetic circuit so that the magnetic field can be effectively conducted and concentrated. The A yoke and the B yoke guide the magnetic field from one side of the magnetic element to the other side to ensure the flow and transmission of the magnetic field.

[0009] Furthermore, the transformer module includes an A base, an A connecting plate, a B connecting plate, an A circuit board, and a coil. A threaded hole, B threaded hole, and C threaded hole are opened on the left side of the top of the base, an H threaded hole is also provided on the top of the base, an N threaded hole is provided at the bottom of the base, B hole and L threaded hole are provided on the A connecting plate, and G threaded hole and M threaded hole are provided on the B connecting plate.

[0010] Furthermore, a D threaded hole and an E threaded hole are provided on the B base of the actuator, and an F threaded hole is provided on the C base of the actuator.

[0011] Furthermore, the control module includes a C base and a B circuit board. The C base is provided with two I threaded holes, and the B circuit board is provided with an A wiring terminal port, a B wiring terminal port, and a C wiring terminal port.

[0012] Further, hole A is aligned with hole B, a fixing piece passes through hole A and hole B, and the thermal magnetic module is connected to the mutual inductor module via the fixing piece, and the fixing piece is preferably a rivet.

[0013] Furthermore, threaded hole A is aligned with threaded hole D, threaded hole A and threaded hole D are connected by a fixing, threaded hole C is aligned with threaded hole E, threaded hole C and threaded hole E are connected by a fixing, threaded hole B is aligned with threaded hole F, threaded hole B and threaded hole F are connected by a fixing, and the transformer module and the actuator are installed together by connecting the above three fixings, and the fixings are preferably screws.

[0014] Furthermore, the I threaded hole is aligned with the H threaded hole, and the two are connected by screws. The execution module is connected to the control module through the A terminal. The G threaded hole is provided with a screw. The screw and the nut fix the wire terminal. The wire terminal is a metal connector for connecting wires. The other end of the wire is connected to the B terminal and the C terminal, so that the transformer module is connected to the circuit board, the A circuit board is connected to the control module through the B terminal, and the coil is connected to the control module through the C terminal.

[0015] Furthermore, a connecting plate is provided on the base, and a J threaded hole and a K threaded hole are provided on the connecting plate. The J threaded hole is aligned with the screw hole and the screw hole on the base, and the three are connected by screws. The screw hole is aligned with the screw hole and the Z threaded hole on the base, and the three are connected by screws. The N threaded hole is aligned with the X threaded hole provided on the base, and the two are connected by screws. The M threaded hole is aligned with the Y threaded hole provided on the base, and the two are connected by screws.

[0016] Furthermore, the actuator includes a push rod for pushing the mechanism traction rod.

[0017] The functions and working principles of the main components in the present invention are as follows:

[0018] The leakage protection module is configured in the molded case circuit breaker. When there is a long-term overload current in the circuit, the temperature of the A connecting plate and the B connecting plate will rise, and the metal sheet will slowly bend forward due to the heat. There is a screw on the metal sheet. When the lateral bending amount exceeds h, the bending of the metal sheet drives the screw forward to push the mechanism traction rod to rotate clockwise, the mechanism trips and the circuit breaker is disconnected. The leakage protection module plays an overload long-delay protection function in this process.

[0019] When the total current passing through the circuits of the A-connection board and the B-connection board is not zero and exceeds the set value, it is detected by the coil and the signal is transmitted to the circuit board of the control module. At the same time, the B-connection board will collect the current in the circuit through the sampling line and transmit the circuit information to the circuit board to monitor the current in the circuit so as to effectively control and protect the circuit.

[0020] The working principle of the actuator is as follows: when normal current passes through the circuit, the electromagnetic force generated by the electromagnet is smaller than the tension of the spring to form a reaction force, the armature cannot be attracted by the electromagnet, and the circuit breaker operates normally. When a leakage fault occurs in the circuit, the current exceeds the set current, the electromagnetic force generated by the electromagnet is greater than the reaction force of the spring, the armature is attracted by the electromagnet, the push rod of the actuator pops out and pushes the mechanism traction rod, the mechanism trips and the circuit breaker is disconnected. At the same time, the actuator will be connected to the control module through the A terminal port, and the action signal it generates will be transmitted and fed back to the control module. The control module operates the actuator through calculations to effectively control and protect the circuit.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] (1) The present invention integrates the overload protection, short circuit protection and leakage protection functions of the circuit breaker into the leakage protection module and places it in an integrated thermal magnetic leakage circuit breaker. Compared with the existing thermal magnetic leakage products, the assembly is more reasonable and simple, and is more conducive to the assembly work of the automated production line.

[0023] (2) Compared with the existing thermal-magnetic leakage protection structure, the phase-to-phase insulation performance of the leakage protection module is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the principle of use of the leakage protection module of the molded case circuit breaker.

[0025] Figure 2 A side view of the thermal-magnetic module.

[0026] Figure 3 The front view of the thermal-magnetic module.

[0027] Figure 4 It is a three-dimensional schematic diagram of the connection structure of the thermal magnetic module and the transformer module.

[0028] Figure 5 It is a front view of the connection structure between the thermal magnetic module and the transformer module.

[0029] Figure 6 It is a top view of the connection structure between the thermal magnetic module and the transformer module.

[0030] Figure 7 It is a cross-sectional view of the connection structure between the thermal magnetic module and the transformer module.

[0031] Figure 8 It is the rear view of the connection structure between the thermal magnetic module and the transformer module.

[0032] Fig. 9 This is a bottom view of the transformer module.

[0033] Fig.10 It is a three-dimensional schematic diagram of the actuator.

[0034] Fig.11 A top view of the actuator.

[0035] Fig.12 A three-dimensional schematic diagram of a control module.

[0036] Fig.13 This is a bottom view of the control module.

[0037] Fig.14 The front view of the control module.

[0038] Fig.15 A top view of the base.

[0039] Fig.16 A top view of the connecting plate on the base.

[0040] Fig.17 This is a cross-sectional view of the leakage protection module of the molded case circuit breaker.

[0041] Figure numerals: 1-transformer module; 2-thermal magnetic module; 3-actuator; 4-control module; 8-mechanism traction rod; 11-A yoke; 12-B yoke; 13-metal element; 14-armature; 15-screw; 21-A connecting plate; 22-A base; 23-B connecting plate; 24-A circuit board; 25-coil; 31-B base; 32-C base; 41-B circuit board; 42-C base; 43-sampling line; 61-J threaded hole; 62-K threaded hole; 72-Z threaded hole ;73-Y threaded hole;74-X screw hole;111-A hole;211-B hole;212-L threaded hole;221-A threaded hole;222-B threaded hole;223-H threaded hole;224-N threaded hole;225-C threaded hole;231-M threaded hole;232-G threaded hole;311-D threaded hole;321-F threaded hole;322-E threaded hole;411-A terminal port;412-B terminal port;413-C terminal port;421-I threaded hole. DETAILED DESCRIPTION

[0042] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms and other features not clearly described in this technical solution are all considered to be common technical features disclosed in the prior art.

[0043] Example 1

[0044] This embodiment provides a leakage protection module for a molded case circuit breaker, including a mutual inductor module 1 , a thermal magnetic module 2 , an actuator 3 , and a control module 4 .

[0045] The thermal magnetic module 2 includes an A yoke 11, a B yoke 12, a metal element 13 and an armature 14. The A yoke 11, the B yoke 12, the metal element 13 and the armature 14 each have two A holes 111.

[0046] The transformer module 1 includes an A base 22, an A connecting plate 21, a B connecting plate 23, an A circuit board 24, and a coil 25. The top left side of the base 22 is provided with an A threaded hole 221, a B threaded hole 222, and a C threaded hole 225. The top of the base 22 is also provided with an H threaded hole 223, and the lower part of the base 22 is provided with an N threaded hole 224. The A connecting plate 21 is provided with a B hole 211 and an L threaded hole 212, and the B connecting plate 23 is provided with a G threaded hole 232 and an M threaded hole 231;

[0047] The B base 31 of the actuator 3 is provided with a D threaded hole 311 and an E threaded hole 322, and the C base 32 of the actuator 3 is provided with an F threaded hole 321;

[0048] The control module 4 includes a C base 42 and a B circuit board 41. The C base 42 has two I threaded holes 421. The B circuit board 41 is provided with an A wiring terminal port 411, a B wiring terminal port 412, and a C wiring terminal port 413.

[0049] The A hole 111 is aligned with the B hole 211, and the rivet passes through the A hole 111 and the B hole 211, and the thermal magnetic module 2 is connected to the mutual inductor module 1 through the rivet;

[0050] The A threaded hole 221 is aligned with the D threaded hole 311, and the A threaded hole 221 and the D threaded hole 311 are connected by screws. The C threaded hole 225 is aligned with the E threaded hole 322, and the C threaded hole 225 and the E threaded hole 322 are connected by screws. The B threaded hole 222 is aligned with the F threaded hole 321, and the B threaded hole 222 and the F threaded hole 321 are connected by screws. The transformer module 1 and the actuator 3 are installed together through the above three screw connections;

[0051] The I threaded hole 421 is aligned with the H threaded hole 223, and the two are connected by screws. The execution module 3 is connected to the control module 4 through the A terminal 411. The G threaded hole 232 is provided with a screw, and the screw and nut fix the wire terminal. The wire terminal is a metal connector for connecting wires. The other end of the wire is connected to the B terminal 412 and the C terminal 413, so that the transformer module 1 is connected to the circuit board 41, the A circuit board 24 is connected to the control module 4 through the B terminal 412, and the coil 25 is connected to the control module 4 through the C terminal 413.

[0052] The base 7 is provided with a connecting plate 6, and the connecting plate 6 is provided with a J threaded hole 61 and a K threaded hole 62. The J threaded hole 61 is aligned with the screw hole 231 and the screw hole 71 on the base 7, and the three are connected by screws. The screw hole 62 is aligned with the screw hole 212 and the Z threaded hole 72 on the base 7, and the three are connected by screws. The N threaded hole 224 is aligned with the X threaded hole 74 provided on the base 7, and the two are connected by screws. The M threaded hole 231 is aligned with the Y threaded hole 73 provided on the base 7, and the two are connected by screws.

[0053] The functions and working principles of the main components in the present invention are as follows:

[0054] The leakage protection module is configured in the molded case circuit breaker. When there is a long-term overload current in the circuit, the temperature of the A connecting plate 21 and the B connecting plate 23 will rise, and the metal sheet 13 will slowly bend forward due to the heat. A screw 15 is provided on the metal sheet 13. When the lateral bending amount exceeds h1, the bending of the metal sheet 13 drives the screw 15 to push the mechanism traction rod 8 forward to rotate clockwise, and the mechanism is tripped and the circuit breaker is disconnected. The leakage protection module plays an overload long-delay protection function in this process.

[0055] When the sum of the currents passing through the circuits of the A connection board 21 and the B connection board 23 is not zero and exceeds the set value, it is detected by the coil 25 and the signal is transmitted to the circuit board 41 of the control module 4. At the same time, the B connection board 23 will collect the current in the circuit through the sampling line 43 and transmit the circuit information to the circuit board 41 to monitor the current in the circuit so as to effectively control and protect the circuit.

[0056] The working principle of the actuator is as follows: when a normal current passes through the circuit, the electromagnetic force generated by the electromagnet is smaller than the tension of the spring to form a reaction force, the armature 14 cannot be attracted by the electromagnet, and the circuit breaker operates normally. When a leakage fault occurs in the circuit, the current exceeds the set current, the electromagnetic force generated by the electromagnet is greater than the reaction force of the spring, the armature 14 is attracted by the electromagnet, the push rod 33 of the actuator 3 pops out and pushes the mechanism traction rod 8, the mechanism trips and the circuit breaker is disconnected. At the same time, the actuator 3 will be connected to the control module 4 through the A terminal port 411, and the action signal generated by it will be transmitted and fed back to the control module 4. The control module 4 operates the actuator 3 through calculation, thereby effectively controlling and protecting the circuit.

[0057] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A leakage protection module for a molded case circuit breaker, characterized in that: It comprises a thermal magnetic module (2), a mutual inductor module (1), an actuator (3), a control module (4), and a base (7); The mutual inductor module (1) is fixedly connected to the base (7); The thermal magnetic module (2) is fixedly connected to one side of the mutual inductor module (1); The actuator (3) is arranged above the mutual inductor module (1) and is fixedly connected to the mutual inductor module (1); The control module (4) is arranged above the transformer module (1), and the control module (4) is fixedly connected to the transformer module (1). At the same time, the control module (4) is connected to the transformer module (1) via electric wires, and the control module (4) is connected to the actuator (3) via electric wires.

2. A leakage protection module for a molded case circuit breaker according to claim 1, characterized in that: The thermal magnetic module (2) comprises an A yoke (11), a B yoke (12), a metal element (13) and an armature (14); the A yoke (11), the B yoke (12), the metal element (13) and the armature (14) are each provided with two A holes (111); and the metal original component (13) is provided with a screw (15).

3. A leakage protection module for a molded case circuit breaker according to claim 2, characterized in that: The mutual inductor module (1) comprises an A base (22), an A connecting plate (21), a B connecting plate (23), an A circuit board (24), and a coil (25); an A threaded hole (221), a B threaded hole (222), and a C threaded hole (225) are provided on the left side of the top of the base (22); an H threaded hole (223) is also provided on the top of the base (22); an N threaded hole (224) is provided at the bottom of the base (22); a B hole (211) and an L threaded hole (212) are provided on the A connecting plate (21); and a G threaded hole (232) and an M threaded hole (231) are provided on the B connecting plate (23).

4. A leakage protection module for a molded case circuit breaker according to claim 3, characterized in that: The B base (31) of the actuator (3) is provided with a D threaded hole (311) and an E threaded hole (322), and the C base (32) of the actuator (3) is provided with an F threaded hole (321).

5. The leakage protection module for molded case circuit breaker according to claim 4, characterized in that: The control module (4) comprises a C base (42) and a B circuit board (41); the C base (42) is provided with two I threaded holes (421); the B circuit board (41) is provided with an A wiring terminal port (411), a B wiring terminal port (412), and a C wiring terminal port (413).

6. A leakage protection module for a molded case circuit breaker according to claim 5, characterized in that: The A hole (111) is aligned with the B hole (211), a rivet passes through the A hole (111) and the B hole (211), and the thermal magnetic module (2) is connected to the mutual inductor module (1) via the rivet.

7. A leakage protection module for a molded case circuit breaker according to claim 6, characterized in that: The A threaded hole (221) is aligned with the D threaded hole (311), the A threaded hole (221) and the D threaded hole (311) are connected by screws, the C threaded hole (225) is aligned with the E threaded hole (322), the C threaded hole (225) and the E threaded hole (322) are connected by screws, the B threaded hole (222) is aligned with the F threaded hole (321), the B threaded hole (222) and the F threaded hole (321) are connected by screws, and the transformer module (1) and the actuator (3) are installed together by three screw connections.

8. The leakage protection module for molded case circuit breaker according to claim 7, characterized in that: The I threaded hole (421) is aligned with the H threaded hole (223), and the two are connected by screws. The execution module (3) is connected to the control module (4) via the A terminal (411). The G threaded hole (232) is provided with a screw, and the screw and nut fix the wire terminal. The other end of the wire is connected to the B terminal (412) and the C terminal (413), so that the mutual inductor module (1) is connected to the circuit board (41), the A circuit board (24) is connected to the control module (4) via the B terminal (412), and the coil (25) is connected to the control module (4) via the C terminal (413).

9. A leakage protection module for a molded case circuit breaker according to claim 8, characterized in that: The base (7) is provided with a connecting plate (6), and the connecting plate (6) is provided with a J threaded hole (61) and a K threaded hole (62). The J threaded hole (61) is aligned with the screw hole (231) and the screw hole (71) on the base (7), and the three are connected by screws. The screw hole (62) is aligned with the screw hole (212) and the Z threaded hole (72) on the base (7), and the three are connected by screws. The N threaded hole (224) is aligned with the X threaded hole (74) provided on the base (7), and the two are connected by screws. The M threaded hole (231) is aligned with the Y threaded hole (73) provided on the base (7), and the two are connected by screws.

10. The leakage protection module for molded case circuit breaker according to claim 1, characterized in that: The actuator (3) comprises a push rod (33) for pushing the mechanism traction rod (8).

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