Leakage circuit breaker

Abstract

The present invention provides a leakage circuit breaker, including a neutral line pole mechanism, a phase line pole mechanism and a test mechanism, the test mechanism including a button, a first elastic member and a second elastic member, the button is pressed down to drive the first elastic member to abut against the second elastic member; the first elastic member is connected to the circuit board through a first lead, the second elastic member is connected to the arc-starting plate through a second lead, the second elastic member is also connected to the third lead, and the third lead is connected to the circuit board through a tripping unit. The button of the test mechanism drives the first elastic member to be pressed down, so that the first elastic member and the second elastic member are connected, that is, the first elastic member and the circuit board can be connected, after the main circuit is connected from the lower end of the leakage circuit breaker, when the test button is pressed, the leakage circuit breaker can be tripped normally, and will not cause the circuit board, leakage tripping coil and the like in the leakage circuit breaker to burn.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a leakage circuit breaker. Background Art

[0002] At present, leakage circuit breakers are usually installed vertically in distribution boxes. General leakage circuit breakers are top-inlet products, with the top end connected to the power line and the bottom end connected to the load. With the diversification of electrical equipment, the layout of various low-voltage protection devices in household and industrial distribution boxes has become complicated. More and more users have put forward the demand for leakage circuit breakers with bottom-inlet function. Bottom-inlet products are products with the top end connected to the load and the bottom end connected to the power line.

[0003] In terms of the internal structure of the leakage circuit breaker, the circuit board needs to be connected to the main circuit power supply as its working power supply, and the circuit board needs to take power from the wiring terminal at the outlet end. After the circuit breaker trips, the power supply on the circuit board is disconnected. If the power is taken from the incoming end, after the circuit breaker trips, the power supply on the electronic circuit board is not disconnected and is always energized. That is, if the upper incoming line product is connected to a circuit that requires the lower incoming line function, when the test button is pressed or there is a leakage action, the electronic circuit board, leakage tripping coil, etc. in the leakage circuit breaker will burn out, and the leakage protection function will fail. Therefore, a leakage circuit breaker that can realize the lower incoming line is needed. Summary of the invention

[0004] The object of the present invention is to provide a leakage circuit breaker to solve the technical problem in the prior art that the power supply on the circuit board is not disconnected and is always energized, and if a wiring error occurs, the leakage protection function will fail.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a leakage circuit breaker, including: a neutral line pole mechanism, a phase line pole mechanism and a test mechanism, the neutral line pole mechanism includes a circuit board and a trip unit; the phase line pole mechanism includes an arc-starting plate; the test mechanism includes a button, a first elastic member and a second elastic member located on a side of the first elastic member away from the button, the button is pressed down to drive the first elastic member to abut against the second elastic member; the first elastic member is connected to the circuit board through a first lead, the second elastic member is connected to the arc-starting plate through a second lead, the second elastic member is also connected to a third lead, and the third lead is connected to the circuit board through the trip unit.

[0006] Furthermore, it also includes a shell, the lower end of the shell is provided with an input terminal, the lower end of the shell is provided with an output terminal, the circuit board is connected to the input terminal, and the arc-starting plate is connected to the output terminal.

[0007] Furthermore, a zero-sequence current transformer is provided on one side of the circuit board, and the first lead is connected to the circuit board through the zero-sequence current transformer.

[0008] Furthermore, the phase line pole mechanism also includes a phase line contact assembly, a terminal plate and a thermal bimetallic strip, the thermal bimetallic strip is connected to the phase line contact assembly, and the terminal plate, the thermal bimetallic strip and one end of the arc striking plate are abutted against each other.

[0009] Furthermore, the neutral line pole mechanism further comprises a contact unit, the contact unit comprises a moving contact assembly and a stationary contact, the circuit board is in conduction with the stationary contact, and the moving contact assembly is also in communication with the stationary contact.

[0010] Furthermore, a first elastic connector and a second elastic connector are connected to one side of the circuit board, a fixed column is provided on one side of the moving contact assembly, two ends of the first elastic connector are respectively connected to the circuit board and the fixed column, and two ends of the second elastic connector are respectively connected to the fixed column and the moving contact.

[0011] Furthermore, the first elastic connecting member is a torsion spring, a torsion arm on one side of the torsion spring is fixedly connected to the circuit board, and a torsion arm on the other side of the torsion spring is in contact with the fixing column.

[0012] Furthermore, a limiting column is convexly provided on the inner side of the shell, and the middle part of the torsion spring is sleeved on the limiting column.

[0013] Furthermore, a limit stopper is protruding from the inner side of the shell for limiting the torsion arm on one side of the torsion spring away from the fixed column, and the torsion arms on both sides of the torsion spring are elastically compressed and deformed to be engaged between the limit stopper and the fixed column.

[0014] Furthermore, the second elastic connecting member is a tension spring, one end of the tension spring is fixedly connected to the fixing column, and the other end of the tension spring is fixedly connected to the moving contact assembly.

[0015] The beneficial effect of the leakage circuit breaker provided by the present invention is that: compared with the prior art, the leakage circuit breaker of the present invention, the phase line pole mechanism can realize the function of current overload and short circuit protection, the phase line pole mechanism can bear the leakage current for detection and realize the leakage tripping action, the test mechanism can detect whether the leakage circuit breaker can realize the protection function, the button of the test mechanism drives the first elastic member to be pressed down, so that the first elastic member and the second elastic member are connected, that is, the first elastic member and the circuit board can be connected, and the second elastic member, the tripping unit and the circuit board are connected. After the main circuit is connected from the lower end of the leakage circuit breaker, when the test button is pressed, the leakage circuit breaker can be tripped normally, and will not cause the circuit board, the leakage tripping coil and the like in the leakage circuit breaker to burn. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic structural diagram of a neutral line pole mechanism of a leakage circuit breaker provided in an embodiment of the present invention;

[0018] Figure 2 for Figure 1 A local enlarged structural schematic diagram of part A in FIG.

[0019] Figure 3 for Figure 1 A schematic diagram of the local enlarged structure of part B in FIG.

[0020] Figure 4 A schematic structural diagram of a phase line pole mechanism of a leakage circuit breaker provided in an embodiment of the present invention.

[0021] Description of reference numerals:

[0022] 1. Neutral line pole mechanism; 2. Phase line pole mechanism; 3. Test mechanism; 4. Shell; 11. Circuit board; 12. Trip unit; 13. Zero sequence current transformer; 14. Contact unit; 15. First elastic connector; 16. Second elastic connector; 17. Fixed column; 111. Through hole; 141. Moving contact assembly; 142. Static contact; 1411. Moving contact; 1412. Operating unit; 21. Arc-starting plate; 22. Phase line contact assembly; 23. Terminal block; 24. Thermal bimetallic strip; 25. Electromagnetic system; 31. Button; 32. First elastic member; 33. Second elastic member; 34. First lead; 35. Second lead; 36. Third lead; 41. Inlet terminal; 42. Outlet terminal; 43. Limit column; 44. Limit stopper. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] Please also read Figures 1 to 4 The leakage circuit breaker provided by the present invention is now described. The leakage circuit breaker includes a neutral line pole mechanism 1, a phase line pole mechanism 2 and a test mechanism 3. The neutral line pole mechanism 1 includes a circuit board 11 and a trip unit 12; the phase line pole mechanism 2 includes an arc-starting plate 21; the test mechanism 3 includes a button 31, a first elastic member 32 and a second elastic member 33 located on a side of the first elastic member 32 away from the button 31, and the button 31 is pressed down to drive the first elastic member 32 to abut against the second elastic member 33; the first elastic member 32 is connected to the circuit board 11 through a first lead 34, the second elastic member 33 is connected to the arc-starting plate 21 through a second lead 35, and the second elastic member 33 is also connected to a third lead 36, and the third lead 36 is connected to the circuit board 11 through the trip unit 12.

[0028] Compared with the prior art, the leakage circuit breaker provided by the present invention has a phase line pole mechanism 2 that can realize the functions of current overload and short circuit protection, and the phase line pole mechanism 2 can bear the leakage current for detection and realize the leakage tripping action. The test mechanism 3 can detect whether the leakage circuit breaker can realize the protection function. The button 31 of the test mechanism 3 drives the first elastic member 32 to be pressed down, so that the first elastic member 32 and the second elastic member 33 are connected, that is, the first elastic member 32 and the circuit board 11 can be connected, and the second elastic member 33, the tripping unit 12 and the circuit board 11 can be connected. After the main circuit is connected from the lower end of the leakage circuit breaker, when the test button 31 is pressed, the leakage circuit breaker can be tripped normally, and will not cause the circuit board 11, the leakage tripping coil and the like in the leakage circuit breaker to burn out.

[0029] Specifically, the first lead 34, the second lead 35 and the third lead 36 are all ordinary flexible wires, wherein the neutral pole mechanism 1 and the phase pole mechanism 2 are generally distributed on both sides of the leakage circuit breaker, so the second lead 35 needs to pass through the housing 4 between the neutral pole mechanism 1 and the phase pole mechanism 2 to achieve communication. The arc-starting plate 21 and the second elastic member 33 are generally located on opposite sides of the leakage circuit breaker, and the second lead 35 can pass from the bottom or top of the circuit board 11. The first elastic member 32 is an elastic plate body, one end of the first elastic member 32 is arranged on the moving path of the button 31, and the other end can be fixed on a fixing member or fixed on a side wall of the trip unit 12. The second elastic member 33 is also arranged on the moving path of the button 31, and the second elastic member 33 is located on the side of the first elastic member 32 away from the button 31. When the button 31 is pressed down, the first elastic member 32 and the second elastic member 33 can be driven to connect. The first elastic member 32 can be directly connected to the circuit board 11, and the second elastic member 33 has two leads, wherein the second lead 35 is directly connected to the arc-starting plate 21, and the arc-starting plate 21 is connected to the outlet terminal 42. After the circuit breaker is tripped, the outlet terminal 42 and the arc-starting plate 21 are both not energized; the third lead 36 is connected to the circuit board 11 through the tripping unit 12. After the circuit breaker is tripped, the third lead 36 cannot be conductive.

[0030] Please also refer to Figures 1 to 4, as a specific embodiment of the leakage circuit breaker provided by the present invention, it also includes a shell 4, the lower end of the shell 4 is provided with an inlet terminal 41, the lower end of the shell 4 is provided with an outlet terminal 42, the circuit board 11 and the inlet terminal 41 are connected, and the arc-starting plate 21 and the outlet terminal 42 are connected. Specifically, the leakage circuit breaker adopts a leakage circuit breaker with a bottom inlet, that is, at this time, the lower end of the leakage circuit breaker is the inlet terminal 41 connected to the power supply, and the upper end is the outlet terminal 42 connected to the load, which can meet the needs of vertical installation in a distribution box or other leakage circuit breakers requiring a bottom inlet function. The circuit board 11 and the inlet terminal 41 are connected, the arc-starting plate 21 and the outlet terminal 42 are connected, the moving contact 1411 of the phase line pole is connected to the outlet terminal 42, and the static contact 142 of the phase line level is connected to the inlet terminal 41 through the electromagnetic system 25.

[0031] For further information, see Figures 1 to 4 As a specific embodiment of the leakage circuit breaker provided by the present invention, a zero-sequence current transformer 13 is further provided on one side of the circuit board 11, and the first lead 34 is connected to the circuit board 11 through the zero-sequence current transformer 13. Specifically, when an electric shock or leakage fault occurs in the circuit of the zero-sequence current transformer 13, the secondary side of the zero-sequence current transformer 13 outputs a zero-sequence current, so that the equipment protection on the connected secondary circuit is actuated, and the first lead 34 can pass through the zero-sequence current transformer 13 and be connected to the circuit board 11, so that the electric shock or leakage accident of the entire circuit of the entire test mechanism 3 is protected by the zero-sequence current transformer 13, and the burning of the circuit board 11, the leakage tripping coil, etc. in the leakage circuit breaker can be further avoided, and the entire leakage circuit breaker is protected.

[0032] Further, see Figures 1 to 4 As a specific embodiment of the leakage circuit breaker provided by the present invention, the phase line pole mechanism 2 also includes a phase line contact assembly 22, a terminal board 23 and a thermal bimetal 24, the thermal bimetal 24 is connected to the phase line contact assembly 22, and the terminal board 23, the thermal bimetal 24 and one end of the arc-starting plate 21 are in contact with each other. Specifically, the phase line contact assembly 22 also includes a moving contact, a static contact and an operating unit for controlling the static contact to move toward the static contact, which are all conventional technologies in the prior art. An electromagnetic system 25 is also connected to one side of the static contact, and the electromagnetic system 25 can be connected to the incoming line terminal 41, and the terminal board 23 can be connected to the outgoing line terminal 42. The thermal bimetal 24 and the terminal block 23 form a thermal tripping system, and the thermal bimetal 24 and the thermal tripping system also have a feedback rod that can be connected to the phase line contact assembly 22. The thermal bimetal 24 will separate from the terminal block 23 when overheated, and the feedback rod body can drive the moving contact and the static contact to separate by using the principle of the connecting rod mechanism, thereby achieving the effect of thermal tripping. Among them, the thermal tripping system can also be a conventional thermal tripping system in the prior art.

[0033] For further information, see Figures 1 to 4 As a specific embodiment of the leakage circuit breaker provided by the present invention, the neutral line pole mechanism 1 further includes a contact unit 14, the contact unit 14 includes a moving contact assembly 141 and a stationary contact 142, the circuit board 11 is in conduction with the stationary contact 142, and the moving contact assembly 141 is also in communication with the stationary contact 142. Specifically, the moving contact assembly 141 includes a moving contact 1411 and an operating unit 1412 for driving the moving contact 1411 to move, the operating unit 1412 can be linked with the operating unit 1412 of the phase line pole mechanism 2, the moving contact 1411 is in communication with the outlet terminal 42, the stationary contact 142 is in communication with the inlet terminal 41 through the circuit board 11, and the moving contact 1411 and the stationary contact 142 can be connected when they abut against each other, and the moving contact 1411 can also be in communication with the moving contact 1411 through a wire or a connecting member.

[0034] Specifically, the neutral line pole mechanism 1 further includes a reset device, which cooperates with the operating unit 1412 to drive the moving contact 1411 to move, thereby separating the moving contact 1411 from the static contact 142. The specific structure of the reset device may be the prior art.

[0035] For further information, see Figure 1 and Figure 3 As a specific embodiment of the leakage circuit breaker provided by the present invention, a first elastic connector 15 and a second elastic connector 16 are connected to one side of the circuit board 11, and a fixed column 17 is provided on one side of the moving contact assembly 141. The two ends of the first elastic connector 15 are respectively connected to the circuit board 11 and the fixed column 17, and the two ends of the second elastic connector 16 are respectively connected to the fixed column 17 and the moving contact 1411. Specifically, the first elastic connector 15 can be directly connected to the circuit board 11, and the second elastic connector 16 can be directly connected to the moving contact assembly 141. The first elastic connector 15 and the second elastic connector 16 are both made of conductive materials, generally made of iron wire, copper wire or other conductive metal wire. Since the moving contact assembly 141 needs to move, the second elastic connector 16 can be used to ensure the connection relationship between the fixed column 17 and the moving contact 1411, and can also avoid the direct use of leads resulting in too many leads mixed and entangled inside. The first elastic connector 15 directly connects the fixing column 17 and the circuit board 11. The first elastic connector 15 can also be used to have a certain elasticity, so that the welding position will not break even under the action of a slight external force, thereby ensuring the stability of the power supply structure between the fixing column 17 and the circuit board 11 and ensuring the stable and normal operation of the leakage circuit breaker.

[0036] Further, see Figure 3 As a specific embodiment of the leakage circuit breaker provided by the present invention, the first elastic connecting member 15 is a torsion spring, one side of the torsion spring is fixedly connected to the circuit board 11, and the other side of the torsion spring is in contact with the fixing column 17. Specifically, the torsion spring is a standard part, which can be purchased directly, with lower production cost, and can play a better conduction effect, and the torsion arms on both sides of the torsion arm are fixedly connected to the circuit board 11 and the fixing column 17 respectively, which can play a better conduction effect, and the torsion arms on both sides of the torsion spring are also elastic, which can meet the need for mobility during welding or installation, and has stronger applicability.

[0037] The circuit board 11 is provided with a through hole 111, and the torsion arm on one side is inserted into the through hole 111 and the outer edge of the torsion arm is welded to the through hole 111. The through hole 111 on the circuit board 11 is a welding hole provided when the circuit board 11 is produced, and the torsion arm can be inserted therein, and then the outer edge of the torsion arm and the inner edge of the through hole 111 are welded, so as to realize the conduction between the torsion arm and the circuit board 11. Compared with the flattening welding in the prior art, the stability after welding is higher and it is not easy to break, and the torsion arm will not become flat, which facilitates the flow of current.

[0038] Further, see Figure 3 As a specific embodiment of the leakage circuit breaker provided by the present invention, a limiting column 43 is convexly provided on the inner side of the housing 4, and the middle part of the torsion spring is sleeved on the limiting column 43. Specifically, the middle part of the torsion spring is formed by winding the spring strip in a ring shape, and the limiting column 43 is convexly provided on the inner side of the housing 4, and the middle part can be directly sleeved on the limiting column 43, so as to limit the position of the torsion spring and prevent the torsion spring from being offset when fixed to affect the connection effect.

[0039] Further, see Figures 1 to 4 As a specific embodiment of the leakage circuit breaker provided by the present invention, a limit stopper 44 is also protruded on the inner side of the shell 4 for limiting the torsion arm on one side of the torsion spring away from the fixed column 17, and the torsion arms on both sides of the torsion spring are elastically compressed and deformed to be engaged between the limit stopper 44 and the fixed column 17. Specifically, the two torsion arms on both sides are elastically compressed, and the outer edge of the torsion arm on one side abuts against the limit stopper 44, and the outer edge of the torsion arm on the other side abuts against the fixed column 17. At this time, there is an elastic restoring force that expands outward between the torsion arms on both sides, which can ensure the stability of the fixation of the entire torsion spring and avoid loosening and poor contact. Among them, the limit stopper 44 can be set only on the side of the torsion arm away from the fixed column 17, and can also be set on the opposite sides of the torsion arm, which is not limited here.

[0040] For further information, see Figures 1 to 4As a specific embodiment of the leakage circuit breaker provided by the present invention, the second elastic connector 16 is a tension spring, one end of which is fixedly connected to the fixed column 17, and the other end is fixedly connected to the moving contact assembly 141. Specifically, the tension spring is an elastic member with fixed parts at both ends, and its two ends can be fixedly connected to the fixed column 17 and the moving contact assembly 141 respectively, that is, when the moving contact assembly 141 moves, the connection stability between the two can still be guaranteed. Among them, the tension spring can also be replaced by other elastic and conductive connecting rods or connecting rings.

[0041] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. Leakage circuit breaker, characterized by: include, A neutral line pole mechanism (1), the neutral line pole mechanism (1) comprising a circuit board (11) and a trip unit (12); A phase line pole mechanism (2), the phase line pole mechanism (2) comprising an arc starting plate (21); and A test mechanism (3), the test mechanism (3) comprising a button (31), a first elastic member (32), and a second elastic member (33) located on a side of the first elastic member (32) away from the button (31), wherein the button (31) is pressed downward to drive the first elastic member (32) to abut against the second elastic member (33); The first elastic member (32) is connected to the circuit board (11) via a first lead (34), the second elastic member (33) is connected to the arc-starting plate (21) via a second lead (35), the second elastic member (33) is also connected to a third lead (36), and the third lead (36) is connected to the circuit board (11) via a trip unit (12); The neutral line pole mechanism (1) further comprises a contact unit (14), the contact unit (14) comprising a moving contact assembly (141) and a stationary contact (142), the circuit board (11) is in electrical communication with the stationary contact (142), and the moving contact assembly (141) is also in electrical communication with the stationary contact (142); A first elastic connector (15) and a second elastic connector (16) are connected to one side of the circuit board (11); a fixing column (17) is provided on one side of the moving contact assembly (141); two ends of the first elastic connector (15) are respectively connected to the circuit board (11) and the fixing column (17); and two ends of the second elastic connector (16) are respectively connected to the fixing column (17) and the moving contact (1411).

2. The residual current circuit breaker according to claim 1, characterized in that: It also comprises a shell (4), the lower end of the shell (4) being provided with an inlet terminal (41), the lower end of the shell (4) being provided with an outlet terminal (42), the circuit board (11) being electrically connected to the inlet terminal (41), and the arc-starting plate (21) being electrically connected to the outlet terminal (42).

3. The residual current circuit breaker according to claim 1, characterized in that: A zero-sequence current transformer (13) is also provided on one side of the circuit board (11), and the first lead (34) is connected to the circuit board (11) via the zero-sequence current transformer (13).

4. The residual current circuit breaker according to claim 1, characterized in that: The phase line pole mechanism (2) further comprises a phase line contact assembly (22), a terminal block (23) and a thermal bimetallic strip (24); the thermal bimetallic strip (24) is connected to the phase line contact assembly (22); the terminal block (23), the thermal bimetallic strip (24) and one end of the arc striking plate (21) are in contact with each other.

5. The residual current circuit breaker according to claim 2, characterized in that: The first elastic connecting member (15) is a torsion spring, one torsion arm of the torsion spring is fixedly connected to the circuit board (11), and the other torsion arm of the torsion spring is in contact with the fixed column (17).

6. The residual current circuit breaker according to claim 5, characterized in that: A limiting column (43) is convexly provided on the inner side of the housing (4), and the middle portion of the torsion spring is sleeved on the limiting column (43).

7. The residual current circuit breaker according to claim 6, characterized in that: A limit stopper (44) is also provided on the inner side of the shell (4) for limiting the torsion arm on one side of the torsion spring away from the fixed column (17); the torsion arms on both sides of the torsion spring are elastically compressed and deformed to be engaged between the limit stopper (44) and the fixed column (17).

8. The residual current circuit breaker according to any one of claims 5 to 7, characterized in that: The second elastic connecting member (16) is a tension spring, one end of which is fixedly connected to the fixing column (17), and the other end of which is fixedly connected to the moving contact assembly (141).

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