A circuit breaker

Abstract

The present invention provides a circuit breaker, comprising a control module, an L-pole circuit breaker and an N-pole circuit breaker. The static contact assemblies of the L-pole circuit breaker and the N-pole circuit breaker are provided with static contact parts for contacting and cooperating with the moving contact assembly. In a closed state, the current direction of the static contact part in the N-pole circuit breaker and the current direction of the moving contact assembly generate an attractive force, while the current direction of the static contact part in the L-pole circuit breaker and the current direction of the moving contact assembly generate a repulsive force. When the circuit breaker is opened, compared with the L-pole circuit breaker, the static contact assembly and the moving contact assembly in the N-pole circuit breaker have a certain delay in disconnection due to the attraction of the same-direction current, so the generated arc is very small, the arc extinguishing chamber structure of the N-pole circuit breaker can be omitted, and the vacated part can be used to more reasonably arrange other devices.

Description

Technical Field

[0001] The invention relates to the field of circuit breakers, and in particular to a circuit breaker with a compact structure. Background Art

[0002] Leakage circuit breakers are widely used in industrial, commercial, residential and other fields. When leakage occurs in the line, they can quickly cut off the faulty power supply within a very short time to protect the safety of people and electrical equipment.

[0003] In the prior art, in order to avoid arcing when the static contact assembly and the moving contact assembly in the circuit breaker are disconnected, an arc extinguishing chamber is generally provided, such as the 1P+N integrated circuit breaker disclosed in the application number 201420836890.5 and the leakage protection circuit breaker disclosed in the application number 201820808612.7, which makes the internal structure of the circuit breaker complex and the overall volume large. Summary of the invention

[0004] To this end, the present invention provides a circuit breaker to solve the above problems.

[0005] To achieve the above purpose, the technical solution provided by the present invention is as follows:

[0006] A circuit breaker comprises a control module, an L-pole circuit breaker and an N-pole circuit breaker, wherein the L-pole circuit breaker and the N-pole circuit breaker both comprise a shell and a static contact assembly and a moving contact assembly arranged in the shell, wherein the control module is respectively arranged in linkage with the moving contact assemblies of the L-pole circuit breaker and the N-pole circuit breaker to perform an opening / closing action, wherein the static contact assembly is provided with a static contact part for contacting and cooperating with the moving contact assembly, wherein in a closed state, the current direction of the static contact part in the N-pole circuit breaker and the current direction of the moving contact assembly generate an attractive force, while the current direction of the static contact part in the L-pole circuit breaker and the current direction of the moving contact assembly generate a repulsive force.

[0007] When the circuit breaker is opened, compared with the L-pole circuit breaker, the static contact assembly and the moving contact assembly in the N-pole circuit breaker have a certain delay in disconnection due to the attraction force generated by the current. The current is mainly disconnected from the L-pole circuit breaker, and the arc generated by the opening in the N-pole circuit breaker is very small. Therefore, the arc extinguishing chamber and arc striking plate structure of the N-pole circuit breaker can be completely omitted, and the vacant part can be used to arrange other devices more reasonably, thereby simplifying the device arrangement structure in the N-pole circuit breaker, so that the overall circuit breaker volume can be set smaller.

[0008] Furthermore, as a preferred structure for implementing the above scheme, the moving contact assembly is provided with a moving contact part cooperating with the static contact part and a wiring terminal connected with a soft connection, the static contact part in the N-pole circuit breaker is extended upward, and the moving contact part of the moving contact assembly of the N-pole circuit breaker is located below the wiring terminal; and the static contact part in the L-pole circuit breaker is extended downward, and the moving contact part of the moving contact assembly of the L-pole circuit breaker is located below the wiring terminal; so that in the closed state, the static contact part and the moving contact assembly in the N-pole circuit breaker have a unidirectional current that generates an attractive force; and the static contact part and the moving contact assembly in the L-pole circuit breaker have a reverse current that generates a repulsive force.

[0009] Furthermore, in order to make the arc generated by opening the N-pole circuit breaker smaller, in the open state, the distance between the stationary contact part and the moving contact assembly in the N-pole circuit breaker is smaller than the distance between the stationary contact part and the moving contact assembly in the L-pole circuit breaker.

[0010] When closing, the static contact part and the moving contact assembly in the N-pole circuit breaker can close contact first, and then move closer during the closing process, resulting in a larger overtravel. When opening, the static contact assembly and the moving contact assembly in the N-pole circuit breaker have a longer delay in disconnecting due to the attraction force generated by the current and the larger overtravel structure, and the arc generated by the opening of the N-pole circuit breaker is smaller and safer.

[0011] Furthermore, it also includes a leakage tripping mechanism, which includes a zero-sequence current transformer, a leakage circuit board and a tripping device cooperating with the moving contact assembly; the soft connection connecting the moving contact assembly of the L-pole circuit breaker and the soft connection connecting the moving contact assembly of the N-pole circuit breaker both pass through the zero-sequence current transformer, the zero-sequence current transformer is connected to the leakage circuit board, and the leakage circuit board is connected to the tripping device.

[0012] Furthermore, the leakage circuit board is arranged in the housing of the N-pole circuit breaker to fully utilize the space in the housing of the N-pole circuit breaker.

[0013] Furthermore, the housing of the N-pole circuit breaker and the housing of the L-pole circuit breaker are provided with interconnected installation openings, and the zero-sequence current transformer is installed on the installation openings.

[0014] Furthermore, the installation opening is located between the moving contact assembly and the outlet terminal.

[0015] Furthermore, the zero-sequence current transformer is also connected to the control module.

[0016] Furthermore, the zero-sequence current transformer is composed of two groups of overlapping zero-sequence current transformer units, one of which is connected to the leakage circuit board, and the other is connected to the control module.

[0017] Furthermore, the control module is an intelligent control module, which includes a shell and a control circuit board and an opening and closing drive device arranged in the shell. The shell of the control module, the shell of the L-pole circuit breaker and the shell of the N-pole circuit breaker are arranged side by side, and also includes a driving shaft, which passes through the three shells. The opening and closing drive device drives and connects to the driving shaft, and the driving shaft is respectively linked to the moving contact assemblies of the L-pole circuit breaker and the N-pole circuit breaker, and the control circuit board is connected to the opening and closing drive device.

[0018] Furthermore, the static contact assembly of the L-pole circuit breaker and the N-pole circuit breaker each has a conductive plate, the static contact part is formed on the conductive plate, a manganese copper sheet is connected in series on the conductive plate, and pins are formed at both ends of the manganese copper sheet, and are connected to the control module through the pins.

[0019] Furthermore, the N-pole circuit breaker is also provided with a leakage test assembly, which includes a conductive part, a conductive elastic part and a test button, the conductive part is connected to the moving contact assembly of the N-pole circuit breaker, and extends a fixed arm that does not move with the moving contact assembly of the N-pole circuit breaker, the conductive elastic part is arranged in the housing of the N-pole circuit breaker and connected to the L-phase power supply, the test button is arranged on the housing of the N-pole circuit breaker, the conductive elastic part extends an elastic arm that abuts against the test button, pressing the test button can drive the elastic arm of the conductive elastic part to move to contact the fixed arm of the conductive part, and the elastic arm of the conductive elastic part can be reset to the fixed arm separated from the conductive part under its own elastic recovery action when the pressing force of the test button is lost.

[0020] Furthermore, the housing of the N-pole circuit breaker is provided with a hinge shaft, the moving contact assembly of the N-pole circuit breaker is hinged on the hinge shaft, the conductive member is a torsion spring, the torsion spring is sleeved on the hinge shaft, its first arm is connected to the moving contact assembly of the N-pole circuit breaker, and its second arm extends outward and is positioned and restricted, thereby forming the fixed arm.

[0021] The technical solution provided by the present invention has the following beneficial effects:

[0022] The current direction of the static contact part in the N-pole circuit breaker and the current direction of the moving contact assembly generate an attractive force, while the current direction of the static contact part in the L-pole circuit breaker and the current direction of the moving contact assembly generate a repulsive force; when the circuit breaker is opened, compared with the L-pole circuit breaker, the static contact assembly and the moving contact assembly in the N-pole circuit breaker have a certain delayed disconnection due to the attraction force generated by the current, and the current is mainly disconnected from the L-pole circuit breaker. The arc generated by the opening in the N-pole circuit breaker is very small. Therefore, the arc extinguishing chamber and the arc striking plate structure of the N-pole circuit breaker can be completely omitted, and the vacant part can be used to arrange other devices more reasonably, thereby simplifying the device arrangement structure in the N-pole circuit breaker, so that the overall circuit breaker volume can be set smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The figure shows the appearance of the circuit breaker in the embodiment;

[0024] Figure 2 The figure shows the internal structure schematic diagram of the L-pole circuit breaker of the circuit breaker in the embodiment;

[0025] Figure 3 The figure shows a schematic diagram of the internal structure of the N-pole circuit breaker of the electric circuit breaker in the embodiment;

[0026] Figure 4 The figure shows a connection diagram of the static contact assembly and the moving contact assembly of the N-pole circuit breaker in the embodiment in the closed state;

[0027] Figure 5 The figure shows a schematic structural diagram of a stationary contact assembly of an N-pole circuit breaker in an embodiment;

[0028] Figure 6 The figure shows a schematic diagram of the connection structure between the moving contact assembly and the zero-sequence current transformer in the embodiment;

[0029] Figure 7 The figure shows a schematic diagram of the internal structure of the N-pole circuit breaker in the embodiment;

[0030] Figure 8 The figure shows the internal structure schematic diagram of the intelligent control module of the circuit breaker in the embodiment;

[0031] Fig. 9 The figure shows a schematic diagram of the overtravel difference between the L pole and the N pole in the circuit breaker in the embodiment;

[0032] Fig.10 The figure shows a schematic diagram of the structure decomposition of the N-pole circuit breaker in the embodiment;

[0033] Fig.11 The figure shows a schematic diagram of the structure decomposition of the L-pole circuit breaker in the embodiment;

[0034] Fig.12 Shown is a schematic diagram of the structural decomposition of the intelligent control module in the embodiment. DETAILED DESCRIPTION

[0035] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0036] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0037] Reference Figures 1 to 12 As shown, a circuit breaker provided in this embodiment is specifically a 1P+N leakage circuit breaker. Of course, in other embodiments, the application scope of this solution is not limited to the 1P+N leakage circuit breaker.

[0038] The circuit breaker includes a control module 10, an L-pole circuit breaker 20 and an N-pole circuit breaker 30, wherein the L-pole circuit breaker 20 and the N-pole circuit breaker 30 both include a housing and a static contact assembly and a moving contact assembly disposed in the housing, wherein the housing, the static contact assembly and the moving contact assembly of the L-pole circuit breaker 20 are defined as the L-pole housing 21, the L-pole static contact assembly and the L-pole moving contact assembly 23, respectively, and the housing, the static contact assembly and the moving contact assembly of the N-pole circuit breaker 30 are defined as the N-pole housing 31, the N-pole static contact assembly and the N-pole moving contact assembly 33, respectively. The control module 10 is respectively arranged in linkage with the moving contact assemblies of the L-pole circuit breaker 20 and the N-pole circuit breaker 30, that is, the L-pole moving contact assembly 23 and the N-pole moving contact assembly 33 are controlled by the control module 10 to perform opening / closing actions.

[0039] The static contact assembly is provided with a static contact part, and the static contact part on the L-pole static contact assembly is defined as the L-pole static contact part 221, and the static contact part on the N-pole static contact assembly is defined as the N-pole static contact part 321. The moving contact assembly is provided with a moving contact part that cooperates with the static contact part and a terminal connected with a soft connection (a conductive wire in this embodiment), and the moving contact assembly is connected to the output terminal through the soft connection. The moving contact part and the terminal of the L-pole moving contact assembly 23 are defined as the L-pole moving contact part 231 and the L-pole terminal 232, and the moving contact part and the terminal of the N-pole moving contact assembly 33 are defined as the N-pole moving contact part 331 and the N-pole terminal 332.

[0040] Reference Figure 3-5 As shown, the N-pole static contact part 321 extends upward, and the N-pole moving contact part 331 is located below the N-pole terminal 332. Figure 2As shown, the L-pole stationary contact part 221 extends downward, and the L-pole moving contact part 231 is located below the L-pole terminal 232 .

[0041] The L-pole static contact assembly and the N-pole static contact assembly are respectively connected to the incoming terminals of the L-pole circuit breaker 20 and the N-pole circuit breaker 30, and the soft connection 24 connecting the moving contact assembly of the L-pole circuit breaker 20 (i.e., the L-pole moving contact assembly 23) and the soft connection 34 connecting the moving contact assembly of the N-pole circuit breaker 30 (i.e., the N-pole moving contact assembly 33) are respectively connected to the outgoing terminals of the L-pole circuit breaker 20 and the N-pole circuit breaker 30.

[0042] When the switch is closed and energized, the L-phase current flows through the L-pole static contact assembly to the L-pole moving contact assembly 23, and then flows out through the soft connection 24 connected to the L-pole moving contact assembly 23. When the current flows through the L-pole static contact part 221 of the L-pole static contact assembly, the current flows downward, and after flowing from the L-pole static contact part 221 to the L-pole moving contact assembly 23, the current flows upward from the L-pole moving contact part 231 to the L-pole terminal 232; the current direction of the L-pole static contact part 221 is opposite to the current direction of the L-pole moving contact assembly 23, forming a reverse current and generating a mutually repelling force.

[0043] The N-phase current flows through the N-pole static contact assembly to the N-pole moving contact assembly 33, and then flows out through the soft connection 34 connected to the N-pole moving contact assembly 33. When flowing through the N-pole static contact part 321 of the N-pole static contact assembly, the current flows upward, and after flowing from the N-pole static contact part 321 to the N-pole moving contact assembly 33, the current flows upward from the N-pole moving contact part 331 to the N-pole terminal 332; the current direction of the N-pole static contact part 321 is the same as the current direction of the N-pole moving contact assembly 33, forming a current in the same direction, generating a force of attraction.

[0044] When the circuit breaker of this scheme is opened, the repulsive force generated by the current between the L-pole static contact assembly 22 and the L-pole moving contact assembly 23 can achieve a quick response to open the circuit; and the attraction force generated by the current between the N-pole static contact assembly 32 and the N-pole moving contact assembly 33 causes a certain delay in disconnection between the N-pole static contact assembly 32 and the N-pole moving contact assembly 33, so that the current is mainly disconnected from the L-pole circuit breaker 20, and the arc generated by the opening in the N-pole circuit breaker 30 is very small. Therefore, the arc extinguishing chamber structure of the N-pole circuit breaker 30 can be completely omitted, and the vacant part can be used to arrange other devices more reasonably, thereby simplifying the device arrangement structure in the N-pole circuit breaker 30, so that the overall circuit breaker volume can be set smaller. The L-pole circuit breaker 20 is normally provided with an arc extinguishing chamber, such as Figure 2 The arc extinguishing chamber 26 is used to extinguish the arc of the L-pole circuit breaker 20.

[0045] Specifically, in this embodiment, the extension direction of the L-pole static contact portion 221 in the L-pole circuit breaker 20 is opposite to the direction from the L-pole moving contact portion 231 of the L-pole moving contact assembly 23 to the L-pole terminal 232, thereby generating a repulsive force when energized, and opening is faster, so that the delay effect of the N-pole circuit breaker 30 is more obvious, the arc generated by the N-pole circuit breaker 30 is smaller, and the components in the N-pole housing 31 of the N-pole circuit breaker 30 are safer, which is the optimal structure. Of course, in other embodiments, the extension direction of the L-pole static contact portion 321 in the L-pole circuit breaker 30 and the direction from the L-pole moving contact portion 331 of the L-pole moving contact assembly 33 to the L-pole terminal 332 do not need to be set opposite, as long as they are set in different directions, so that the opening of the N-pole circuit breaker 30 has a certain delay.

[0046] Further preferably, in the open state, the distance between the N-pole static contact part 321 and the N-pole moving contact assembly 33 in the N-pole circuit breaker 30 is smaller than the distance between the L-pole static contact part 221 and the L-pole moving contact assembly 23 in the L-pole circuit breaker 20; in the closing process, the N-pole static contact part 321 and the N-pole moving contact assembly 33 in the N-pole circuit breaker 30 can first close and contact, and further approach each other in the process of continuing to close, and the overtravel is larger. The larger overtravel makes the stroke larger when disconnecting, the time taken for disconnection will be longer, and the arc generated in the N-pole circuit breaker 30 is smaller and safer. Of course, in other embodiments, if the attraction current of the N-pole circuit breaker 30 and the repulsion current of the L-pole circuit breaker 20 can ensure that the arc generated in the N-pole circuit breaker 30 is safe, there is no need to add an overtravel structure.

[0047] Specifically, in this embodiment, the structure for achieving a larger overtravel in the N-pole circuit breaker 30 is as follows: Fig. 9 As shown, specifically: in the open state, the L-pole moving contact assembly 23 of the L-pole circuit breaker 20 and the N-pole moving contact assembly 33 of the N-pole circuit breaker 30 overlap on the vertical projection plane, that is, the positions are the same. The N-pole static contact part 321 will be arranged more forward than the N-pole moving contact assembly 33, so that the distance between the N-pole static contact part 321 and the N-pole moving contact assembly 33 will be smaller. When the moving contact assembly approaches the static contact part at the same speed, the contact between the N-pole moving contact assembly 33 and the N-pole static contact part 321 will precede the contact between the L-pole moving contact assembly 23 and the L-pole static contact part 221. Of course, in other embodiments, the positions of the N-pole static contact part 321 and the L-pole static contact part 221 may also overlap, and the positions of the L-pole moving contact assembly 23 and the N-pole moving contact assembly 33 may be changed to achieve the above.

[0048] The circuit breaker also includes a leakage tripping mechanism for realizing leakage disconnection, and the leakage tripping mechanism includes a zero-sequence current transformer 40, a leakage circuit board 50 and a tripping device cooperating with the moving contact assembly; specifically, both the N-pole circuit breaker 30 and the L-pole circuit breaker 20 are provided with a tripping device, and the tripping device arranged in the N-pole circuit breaker 30 and cooperating with the N-pole moving contact assembly 33 is defined as the N-pole tripping device 35, and the tripping device arranged in the L-pole circuit breaker 20 and cooperating with the L-pole moving contact assembly 23 is defined as the L-pole tripping device 25.

[0049] The soft connection 24 connected to the moving contact assembly 23 of the L-pole circuit breaker 20 and the soft connection 34 connected to the moving contact assembly 33 of the N-pole circuit breaker 30 both pass through the zero-sequence current transformer 40. The zero-sequence current transformer 40 is connected to the leakage circuit board 50 to output the induction signal to the leakage circuit board 50. The leakage circuit board 50 is respectively connected to the tripping devices of the L-pole circuit breaker 20 and the N-pole circuit breaker 30. When leakage occurs, the leakage circuit board 50 controls the L-pole tripping device 25 of the L-pole circuit breaker 20 and the N-pole tripping device 35 of the N-pole circuit breaker 30 to operate, thereby realizing leakage detection and leakage control tripping.

[0050] Specifically, the leakage circuit board 50 is arranged in the housing (i.e., N-pole housing 31) of the N-pole circuit breaker 30. Since the arc generated by the N-pole circuit breaker 30 is small and insufficient to have a substantial impact on the device, the N-pole circuit breaker 30 is provided with the leakage circuit board 50 in the housing (i.e., N-pole housing 31) of the N-pole circuit breaker 30 without the arc extinguishing chamber, so that the space can be fully utilized for layout, and the structure is compact. At the same time, the leakage circuit board 50 belongs to a strong current circuit board, that is, it directly connects the power supply of the L phase and the N phase for driving, such as directly connecting the incoming line end of the L-pole circuit breaker 20 and the N-pole circuit breaker 30, and can also be isolated from the control module 10 of the weak current drive (such as 12V) to avoid affecting the control module 10, so that the operation of the circuit breaker is more stable. Specifically, the leakage circuit board 50 is a prior art, and its specific integrated circuits, etc. have been mastered and used by technicians in this field for a long time, and will not be described in detail here.

[0051] Specifically, the N-pole housing 31 of the N-pole circuit breaker 30 and the L-pole housing 21 of the L-pole circuit breaker 20 are provided with interconnected installation openings (i.e., the installation opening 314 of the N-pole housing 31 and the installation opening 211 of the L-pole housing 21), and the zero-sequence current transformer 40 is installed on the installation openings, so that the inner ring of the zero-sequence current transformer 40 can be simultaneously in the N-pole housing 31 and the L-pole housing 21, which facilitates the penetration and connection of the soft connections 24 and 34 of the L pole and the N pole. More specifically, the installation opening is located between the moving contact assembly and the outlet terminal. For example, in the N-pole circuit breaker 30, the zero-sequence current transformer 40 installed on the installation opening is located between the N-pole moving contact assembly 33 and the N-pole outlet terminal. In the L-pole circuit breaker 20, the zero-sequence current transformer 40 is located between the L-pole moving contact assembly 23 and the L-pole outlet terminal. At the same time, the axial line of the zero-sequence current transformer 40 is in the same direction as the connecting line of the incoming and outgoing terminals, so that the soft connection can be completed with the shortest length, and the structural setting is more optimized. Of course, in other embodiments, the setting structure of the zero-sequence current transformer 40 is not limited to this, and the entire zero-sequence current transformer 40 can also be directly placed in the N-pole housing 31, etc.

[0052] For details, please refer to Figure 8 As shown, the control module 10 is the intelligent control module, and the control module 10 includes a shell, a control circuit board 12 and an opening and closing drive device arranged in the shell. The shell of the intelligent control module is defined as the control shell 11. The shell of the intelligent control module (i.e., the control shell 11), the shell of the L-pole circuit breaker 20 (i.e., the L-pole shell 21) and the shell of the N-pole circuit breaker 30 (i.e., the N-pole shell 31) are arranged side by side, and also include a driving shaft (not shown), which runs through the three shells. The opening and closing drive device drives and connects the driving shaft, and the driving shaft is respectively linked to the moving contact assemblies of the L-pole circuit breaker 20 and the N-pole circuit breaker 30. The control circuit board 12 is connected to the opening and closing drive device to control the operation of the opening and closing drive device. More specifically, in this embodiment, the opening and closing drive device includes a drive motor 13 and a gear transmission assembly 14. The control circuit board 12 is connected to the drive motor 13 to control the rotation of the drive motor 13. The rotation of the drive motor 13 drives the drive shaft to rotate through the gear transmission assembly 14, thereby controlling the opening and closing of the switch.

[0053] Further, the stationary contact assembly of the L-pole circuit breaker 20 and the N-pole circuit breaker 30 both have a conductive plate, such as the conductive plate 22 of the L-pole stationary contact assembly and the conductive plate 32 of the N-pole stationary contact assembly, so as to Figure 4 , Figure 5Take the N-pole static contact assembly as an example (the structure of the L-pole static contact assembly is the same), the N-pole static contact part 321 is formed on the conductive plate 32, a manganese copper sheet 322 is connected in series on the conductive plate 32, and pins 323 are formed at both ends of the manganese copper sheet 322, and connected to the control module 10 through the pins 323, specifically connected to the control circuit board 12 of the control module 10, the control circuit board 12 collects the electrical signals of the L phase and the N phase (such as voltage, current, etc.) through the manganese copper sheet, measures the voltage, current and other electrical signals for external output, and the structure is simple. Of course, in other embodiments, the conductive plate structure of the static contact assembly is not limited to this.

[0054] The control circuit board 12 collects the electrical signals of the L phase and the N phase through the manganese copper sheet, performs metering, and determines whether it is overloaded. If overload occurs, the opening operation is controlled. In this way, there is no need for the structure of controlling the overload tripping by the bimetallic sheet in the prior art. The position for setting the bimetallic sheet between the moving contact assembly and the outlet terminal is vacated, and this position is used to place the zero-sequence current transformer 40. The moving contact needs to cooperate with the opening and closing movement of the circuit breaker, so the moving contact is connected to the soft connection, and the soft connections 24 and 34 on the L-pole circuit breaker 20 and the N-pole circuit breaker 30 simultaneously pass through the zero-sequence current transformer 40 to measure the leakage current. This structural design meets the market demand for short circuit breakers, small external dimensions, compact structure, and low cost.

[0055] Furthermore, the zero-sequence current transformer 40 is also connected to the control module 10, specifically connected to the control circuit board 12 of the control module 10, and the control circuit board 12 collects the output signal of the zero-sequence current transformer 40, determines whether leakage occurs, and outputs it externally.

[0056] Specifically, the integrated circuit structure of the control circuit board 12 and the connection relationship with external devices (such as the zero-sequence current transformer 40, the drive motor 13, etc.) are all existing technologies and will not be described in detail here.

[0057] Furthermore, in this embodiment, the zero-sequence current transformer 40 is composed of two groups of overlapping zero-sequence current mutual inductance units, one of which is connected to the leakage circuit board 50, and the other is connected to the control module 10, and the signal outputs of the two groups of zero-sequence current mutual inductance units will not interfere with each other. Of course, in other embodiments, the zero-sequence current transformer 40 can also be directly implemented by using a zero-sequence current mutual inductance unit, and two groups of output terminals are connected in parallel at its output terminal to respectively connect the leakage circuit board 50 and the control module 10, but the two groups of output terminals connected in parallel may interfere with each other, which is not the most preferred.

[0058] For details, please refer to Figure 7As shown, the N-pole circuit breaker 30 is also provided with a leakage test assembly, which includes a conductive member 38, a conductive elastic member 37 and a test button 36. The conductive member 38 is connected to the N-pole moving contact assembly 33 of the N-pole circuit breaker 30, and extends with a fixed arm 383 that does not move with the N-pole moving contact assembly 33 of the N-pole circuit breaker 30. The conductive elastic member 37 is arranged in the housing (i.e., the N-pole housing 31) of the N-pole circuit breaker 30 and connected to the L-phase power supply. The test button 36 The conductive elastic member 37 is provided on the housing of the N-pole circuit breaker 30, and the conductive elastic member 37 extends with an elastic arm 373 that contacts the test button 36. Pressing the test button 36 can drive the elastic arm 372 of the conductive elastic member 37 to move to contact the fixed arm 383 of the conductive member 38, thereby forming a leakage test circuit. The zero-sequence current transformer 40 senses and outputs a signal to the leakage circuit board 50, and the leakage circuit board 50 controls the tripping device to perform a tripping action to achieve a leakage tripping test. When the test button 36 loses the pressing force and rebounds, the elastic arm 373 of the conductive elastic member 37 loses the pressing force of the test button 36, and at this time can be reset to the fixed arm 383 separated from the conductive member 38 under the action of its own elastic recovery.

[0059] Specifically, in this embodiment, the leakage circuit board 50 located in the N-pole housing 31 is connected to the L-phase power supply, so the conductive elastic member 37 can be directly connected to the L-phase power supply connection terminal 501 of the leakage circuit board 50 through a conductive wire 39, simplifying the circuit structure. Of course, in other embodiments, the conductive elastic member 37 can also be connected to the L-pole static contact assembly of the L-pole circuit breaker 20, or to the L-pole moving contact assembly 23 of the L-pole circuit breaker 20, or to the incoming or outgoing terminal of the L-pole circuit breaker 20, as long as it can be connected to the L-phase power supply.

[0060] Specifically, the conductive elastic member 37 is a torsion spring, which is defined as a first torsion spring. A first fixed boss 312 and a second fixed boss 311 located between the first fixed boss 312 and the test button 36 are provided in the shell of the N-pole circuit breaker 30. The first torsion spring is sleeved on the second fixed boss 311, and its first arm 371 abuts against the first fixed boss 312, and its second arm 372 abuts against the test button 36. The second arm 372 is an elastic arm 373. In this way, the fixed setting of the conductive elastic member 37 can be completed without the need for auxiliary fixation by other fixing members.

[0061] To be more specific, the housing of the N-pole circuit breaker 30 is provided with a hinge shaft 313, and the moving contact assembly of the N-pole circuit breaker 30 (i.e., the N-pole moving contact assembly 33) is hinged on the hinge shaft 313, and the opening and closing actions are realized by swinging along the hinge shaft 313. The conductive member 38 is a torsion spring, and the torsion spring is defined as a second torsion spring. The second torsion spring 38 is sleeved on the hinge shaft 313, and its first arm 381 is connected to the N-pole moving contact assembly 33, and its second arm 382 extends outward and is positioned and restricted, thereby forming the fixed arm 383; when the N-pole moving contact assembly 33 opens and closes, it drives the first arm 381 of the second torsion spring 38 to move synchronously, and the second torsion spring 38 then produces a corresponding degree of deformation, and its second arm 382 can always maintain the current position. At the same time, the second torsion spring 38 also serves as a switch-off energy storage component. When the N-pole moving contact assembly 33 is closed, it overcomes the torsion of the second torsion spring 38 to swing, thereby causing the second torsion spring 38 to produce a large elastic deformation. When tripping, the second torsion spring 38 recovers the deformation and synchronously drives the N-pole moving contact assembly 33 to swing back to the position to open the switch. The test circuit has a simple structure, uses few components and is easy to assemble. Of course, in other embodiments, other existing leakage test components can also be used.

[0062] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A circuit breaker, comprising a control module, an L-pole circuit breaker and an N-pole circuit breaker, wherein the L-pole circuit breaker and the N-pole circuit breaker each comprise a housing and a static contact assembly and a moving contact assembly disposed in the housing, wherein the control module is respectively linked with the moving contact assemblies of the L-pole circuit breaker and the N-pole circuit breaker to perform an opening / closing action, characterized in that: The static contact assembly is provided with a static contact part for contacting and cooperating with the moving contact assembly. In the closed state, the current direction of the static contact part in the N-pole circuit breaker and the current direction of the moving contact assembly generate an attractive force, while the current direction of the static contact part in the L-pole circuit breaker and the current direction of the moving contact assembly generate a repulsive force; The moving contact assembly is provided with a moving contact part matched with a static contact part and a wiring terminal connected with a flexible connection. The static contact part in the N-pole circuit breaker is extended upward, and the moving contact part of the moving contact assembly of the N-pole circuit breaker is located below the wiring terminal; while the static contact part in the L-pole circuit breaker is extended downward, and the moving contact part of the moving contact assembly of the L-pole circuit breaker is located below the wiring terminal; so that in the closed state, the static contact part in the N-pole circuit breaker and the moving contact assembly have a same-direction current that generates an attraction; while the static contact part in the L-pole circuit breaker and the moving contact assembly have a reverse current that generates a repulsion.

2. The circuit breaker according to claim 1, characterized in that: In the open state, the distance between the stationary contact part and the moving contact assembly in the N-pole circuit breaker is smaller than the distance between the stationary contact part and the moving contact assembly in the L-pole circuit breaker.

3. The circuit breaker according to claim 1, characterized in that: It also includes a leakage tripping mechanism, which includes a zero-sequence current transformer, a leakage circuit board and a tripping device cooperating with a moving contact assembly; the soft connection connecting the moving contact assembly of the L-pole circuit breaker and the soft connection connecting the moving contact assembly of the N-pole circuit breaker both pass through the zero-sequence current transformer, the zero-sequence current transformer is connected to the leakage circuit board, and the leakage circuit board is connected to the tripping device.

4. The circuit breaker according to claim 3, characterized in that: The leakage circuit board is arranged in the housing of the N-pole circuit breaker.

5. The circuit breaker according to claim 3, characterized in that: The housing of the N-pole circuit breaker and the housing of the L-pole circuit breaker are provided with interpenetrating installation openings, and the zero-sequence current transformer is installed on the installation openings.

6. The circuit breaker according to claim 5, characterized in that: The installation opening is located between the moving contact assembly and the outlet terminal.

7. The circuit breaker according to claim 3, characterized in that: The control module is an intelligent control module, which includes a shell, a control circuit board and an opening and closing drive device arranged in the shell. The shell of the control module, the shell of the L-pole circuit breaker and the shell of the N-pole circuit breaker are arranged side by side, and also includes a driving shaft. The driving shaft runs through the three shells. The opening and closing drive device is driven and connected to the driving shaft. The driving shaft is respectively linked to the moving contact assemblies of the L-pole circuit breaker and the N-pole circuit breaker. The control circuit board is connected to the opening and closing drive device, and the zero-sequence current transformer is also connected to the control module.

8. The circuit breaker according to claim 7, characterized in that: The zero-sequence current transformer is composed of two groups of overlapping zero-sequence current transformer units, one of which is connected to the leakage circuit board, and the other is connected to the control module.

9. The circuit breaker according to claim 7, characterized in that: The static contact assembly of the L-pole circuit breaker and the N-pole circuit breaker both have a conductive plate, the static contact part is formed on the conductive plate, a manganese copper sheet is connected in series on the conductive plate, and pins are formed at both ends of the manganese copper sheet, and connected to the control module through the pins.

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