A residual current circuit breaker

Abstract

A leakage circuit breaker includes an L-phase pole module, an N-phase pole module, a reclosing pole module, and a leakage protection module. An L-pole handle structure and an L-pole operating mechanism are provided between the L-pole incoming line terminal and the L-pole outgoing line terminal of the L-phase pole module. An L-pole moving contact of an L-pole contact mechanism is connected to the L-pole operating mechanism. A current transformer is provided between the L-pole moving contact and the L-pole incoming line terminal. The connecting wire connected between the L-pole moving contact and the L-pole incoming line terminal passes through the current transformer. The current transformer is connected to the circuit board of the reclosing pole module to feedback the current signal of the main circuit. When overloaded, the controller of the circuit board drives the reclosing pole module to act to achieve automatic tripping. The current inductor of the present invention senses the overload current to make the reclosing pole module act to achieve the tripping of the circuit breaker, having the advantages of rapid action, stable performance, and high detection accuracy.

Description

Technical Field

[0001] The present invention relates to a circuit breaker, and more particularly to a leakage circuit breaker. Background Art

[0002] A low-voltage circuit breaker, also known as an automatic air switch or an automatic air circuit breaker, can be used to distribute electric energy, protect circuits and power equipment from overload and short circuit, and can also be used for infrequent conversion of circuits and infrequent starting of motors. At present, the mainstream low-voltage circuit breakers on the market generally consist of a contact system, an arc extinguishing system, an operating mechanism, a bimetallic strip, and a short-circuit release, etc. When an overload occurs in the power consumption circuit where the low-voltage circuit breaker is located, the bimetallic strip is heated and bent to deform, causing the operating mechanism to act, so that the low-voltage circuit breaker trips instantaneously. However, since the action of the bimetallic strip being heated and bent requires a certain amount of time, this tripping method cannot trip in time when an overload occurs, and has poor stability and low detection accuracy. Summary of the Invention

[0003] The object of the present invention is to overcome the defects of the prior art and provide a leakage circuit breaker with a simple structure and high reliability.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A leakage circuit breaker includes an L-phase pole module, an N-phase pole module, a reclosing pole module, and a leakage protection module. The L-phase pole module includes a pair of L-pole incoming line terminals and L-pole outgoing line terminals arranged on both sides of the L-phase pole module. An L-pole handle structure and an L-pole operating mechanism are arranged between the L-pole incoming line terminal and the L-pole outgoing line terminal. An L-pole moving contact of the L-pole contact mechanism is connected to the L-pole operating mechanism. A current transformer is arranged between the L-pole moving contact and the L-pole incoming line terminal. The connecting wire connecting the L-pole moving contact and the L-pole incoming line terminal passes through the current transformer. The current transformer is connected to the circuit board of the reclosing pole module for feeding back the current signal of the main circuit to the controller on the circuit board. When an overload occurs, the controller on the circuit board drives the reclosing pole module to act to achieve automatic tripping.

[0006] Further, the N-phase pole module includes an N-pole handle structure, an N-pole operating mechanism, and an N-pole contact mechanism. The reclosing pole module includes a driving handle and a tripping driving structure. The N-pole handle structure is linked with the L-pole handle structure. The N-pole operating mechanism is the same as the L-pole operating mechanism and is linked and connected through an L-pole locking linkage shaft arranged on the L-pole operating mechanism. The N-pole locking linkage shaft in the N-pole operating mechanism is used to cooperate with the tripping driving structure in the reclosing pole module. The tripping driving structure pushes the N-pole locking linkage shaft in the N-pole operating mechanism to rotate. Under the linkage action of the L-pole locking linkage shaft in the L-pole operating mechanism, the L-pole operating mechanism and the N-pole operating mechanism perform synchronous tripping actions.

[0007] Further, the driving handle is linked with the L-pole handle structure and the N-pole handle structure through a handle linkage shaft. After receiving a closing action instruction, the reclosing pole module enables the L-phase pole module and the N-phase pole module to achieve an automatic closing function under the action of the handle linkage shaft.

[0008] Further, the N-phase pole module is arranged between the L-phase pole module and the reclosing pole module, and the leakage protection modules are dispersedly arranged in the N-phase pole module and the reclosing pole module; the leakage protection module includes a zero-sequence current transformer, a leakage release, and a test button circuit. The zero-sequence current transformer and the leakage release are arranged in the N-phase pole module, the test button circuit is arranged in the reclosing pole module, the leakage release and the test button circuit are connected to the circuit board of the reclosing pole module, and the on-off of the test button circuit is operated by a test button arranged in the reclosing pole module.

[0009] Further, a yoke for enhancing the electromagnetic force of the leakage release is covered on the leakage release.

[0010] Further, the on-off of the test button circuit is controlled by a microswitch, the microswitch is arranged on the circuit board of the reclosing pole module, and the test button is used to operate the on-off of the test button circuit by cooperating with the microswitch.

[0011] Further, the N-phase pole module includes an N-phase pole module housing. Inside the N-phase pole module housing, there are an N-pole handle structure, an N-pole operating mechanism, an N-pole contact mechanism, and a pair of N-pole terminal blocks. The pair of N-pole terminal blocks are respectively arranged on both sides of the N-phase pole module housing. One of the N-pole terminal blocks serves as the N-pole outgoing line terminal, and the other N-pole terminal block serves as the N-pole incoming line terminal. The N-pole handle structure and the N-pole operating mechanism are arranged at the upper part of the N-phase pole module housing. The N-pole moving contact in the N-pole contact mechanism is connected to the N-pole operating mechanism. The N-pole moving contact is connected to the N-pole incoming line terminal through a wire. The N-pole moving contact is located in the middle of the N-phase pole module housing. The N-pole static contact of the N-pole contact mechanism is fixedly installed in the middle of the N-phase pole module housing and is arranged opposite to the N-pole moving contact. The N-pole static contact is connected to the N-pole outgoing line terminal through a wire;

[0012] A third partition board is further arranged in the N-phase pole module housing. The third partition board is arranged between the N-pole moving contact and the N-pole incoming line terminal to prevent the arc from spraying back during the breaking process of the N-pole contact mechanism; an arc extinguishing chamber is arranged between the third partition board and the zero-sequence current transformer, and an arc running channel is arranged at the end of the arc extinguishing chamber. The arc running channel is connected to an exhaust hole arranged on one side of the N-phase pole module housing.

[0013] Furthermore, the arc extinguishing chamber includes a first chamber wall and a second chamber wall, the head end of the first chamber wall is located in the middle of the N-phase pole module housing, the middle of the first chamber wall is arranged around one side of the zero-sequence transformer, and a gap is left between the part of the first chamber wall close to the tail end and the inner wall of the N-phase pole module housing as an arc running channel, the tail end of the first chamber wall is opposite to the exhaust hole of the N-phase pole module housing, the head end of the second chamber wall is connected to the third partition plate, and the tail end of the second chamber wall is connected to the inner wall of one side of the N-phase pole module housing provided with the exhaust hole.

[0014] Furthermore, the L-phase pole module includes an L-phase pole module housing, and an arc isolation structure is provided in the middle of the L-phase pole module housing, and the arc isolation structure includes a first partition and multiple second partitions, the first partition is arranged between the L-pole moving contact and the current transformer, and is used to prevent the electric arc or high-temperature gas from flowing into the space where the current transformer is located; the multiple second partitions are arranged at intervals to form an unclosed buffer chamber, and the buffer chamber is located between the L-pole output terminal and the arc extinguishing chamber.

[0015] Furthermore, a switching switch is also provided in the reclosing gate module, and the switching switch is located between the driving handle and the test button. The switching switch drive is used to set the circuit breaker module to manual mode or automatic mode; the switching switch includes a toggle switch and a push plate, the toggle switch is arranged on the circuit board, the push plate is arranged on the surface of the toggle switch and is used to push the toggle switch, and an opening corresponding to the push plate is provided in the reclosing gate module for pushing the push plate.

[0016] Furthermore, the reclosing gate module includes a reclosing gate module housing, and a driving handle, a gear transmission device, a tripping driving structure, a motor, and a circuit board are arranged inside the reclosing gate module housing; the driving handle, the gear transmission device and the motor are arranged on the surface of the circuit board; the driving handle and the gear transmission device cooperate to rotate through a driving connecting rod, the gear transmission device is connected to the motor, and the motor drives the driving connecting rod through the gear transmission device to drive the driving handle to realize automatic closing; the tripping driving structure is arranged on the side of the gear transmission device facing the circuit board, the tripping driving structure includes a driving boss arranged on the gear transmission device and a tripping driving member rotatably installed on the reclosing gate module housing, one end of the tripping driving member is rotatably installed on the reclosing gate module housing, and the other end of the tripping driving member is arranged corresponding to the N-pole lock linkage shaft of the N-pole operating mechanism.

[0017] A leakage circuit breaker of the present invention is provided with a current transformer in the L-phase pole module. The current transformer feeds back the current of the main circuit of the circuit breaker to the circuit board of the reclosing pole module. The controller of the circuit board in the reclosing pole module determines overload and then drives the reclosing pole module to operate to achieve the tripping of the circuit breaker. Through the automatic tripping function of the reclosing pole module, overload protection is realized. Compared with the existing overload protection mechanism composed of bimetal sheets, it has the advantages of rapid action, stable performance and high detection accuracy, and there is no need to set up a special overload protection mechanism, so the volume is greatly reduced.

[0018] In addition, the N-phase pole module is arranged between the L-phase pole module and the reclosing pole module, and the leakage protection module is dispersedly arranged in the N-phase pole and the reclosing pole module, which improves the assembly and welding efficiency and reduces the length of the electrical connection wire loop, making the circuit breaker have the leakage protection function and being conducive to miniaturization design.

[0019] In addition, a first partition is arranged between the L-pole moving contact of the L-phase pole module and the current transformer to prevent the arc or high-temperature gas from pouring into the space where the current transformer is located and affecting the detection accuracy of the current transformer; a plurality of second partitions are arranged between the arc extinguishing chamber and the L-pole outgoing terminal, and an unclosed buffer chamber surrounded by the plurality of second partitions is used to cool the arc exhaust gas.

[0020] In addition, a third partition is arranged in the N-phase pole module. The third partition is used to prevent the arc from spraying back when the N-pole contact mechanism is disconnected. An arc extinguishing chamber is arranged between the third partition and the zero-sequence current transformer, and an arc running channel is formed at the end of the arc extinguishing chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of a leakage circuit breaker of the present invention;

[0022] Figure 2 is Figure 1 a cross-sectional view of;

[0023] Figure 3 is an internal structure schematic diagram of a leakage circuit breaker of the present invention;

[0024] Figure 4 is a structural schematic diagram of the L-phase pole module of a leakage circuit breaker of the present invention;

[0025] Figure 5 is a structural schematic diagram of the L-phase pole cover of a leakage circuit breaker of the present invention;

[0026] Figures 6-7 is a structural schematic diagram of the N-phase pole module of a leakage circuit breaker of the present invention;

[0027] Figure 8 is a structural schematic diagram of the N-phase pole cover of a leakage circuit breaker of the present invention;

[0028] Figure 9 is a schematic structural diagram of a reclosing pole module of a leakage circuit breaker according to the present invention;

[0029] Figure 10 is Figure 9 an enlarged view of part A of;

[0030] Figure 11 is a schematic structural diagram of a reclosing pole module of a leakage circuit breaker according to the present invention;

[0031] Figure 12 is a schematic structural diagram of a circuit board of a leakage circuit breaker according to the present invention. Specific embodiments

[0032] The following is combined with the attached Figures 1 to 12 The given embodiments are used to further illustrate the specific embodiments of a leakage circuit breaker according to the present invention. The leakage circuit breaker according to the present invention is not limited to the description of the following embodiments.

[0033] A leakage circuit breaker, as Figures 1-3 shown, includes an L-phase pole module 1, an N-phase pole module 2, a reclosing pole module 3, and a leakage protection module. The N-phase pole module 2 is arranged between the L-phase pole module 1 and the reclosing pole module 3. The leakage protection module is dispersedly arranged in the N-phase pole module 2 and the reclosing pole module 3, shortening the wire connection length between the leakage protection module and the reclosing pole module 3, improving the assembly and welding efficiency, and facilitating the overall miniaturized design. The L-phase pole module 1 includes an L-pole handle structure 14, an L-pole operating mechanism 15, and an L-pole contact mechanism 16. The N-phase pole module 2 includes an N-pole handle structure 24, an N-pole operating mechanism 25, and an N-pole contact mechanism 26. The reclosing pole module 3 includes a driving handle 31. The driving handle 31 is linked with the L-pole handle structure 14 and the N-pole handle structure 24 through a handle linkage shaft. After receiving a closing action instruction, the reclosing pole module 3 enables the L-phase pole module 1 and the N-phase pole module 2 to realize an automatic closing function under the action of the handle linkage shaft. Of course, the L-phase pole module can also be arranged between the N-phase pole module and the reclosing pole module, and the same function can also be realized.

[0034] As Figure 3 、 8-11 In the reclosing pole module 3, a driving handle 31, a circuit board 35, a gear transmission device 32, a tripping drive structure and a motor 33 are installed. The driving handle 31 is linked with the L-pole handle structure 14 and the N-pole handle structure 24. The L-pole operating mechanism 15 is linked with the N-pole operating mechanism 25 and is also linked with the tripping drive structure. The driving handle 31 is drivingly connected to the gear transmission device 32 through a driving link 34. When the controller on the circuit board 35 receives a closing action signal, the motor 33 and the gear transmission device 32 rotate and drive the driving link 34 to rotate. The driving link 34 causes the driving handle 31 to rotate. The driving handle 31 drives the L-pole handle structure 14 and the N-pole handle structure 24 to rotate and makes the L-pole operating mechanism 15 and the N-pole operating mechanism 25 act to achieve automatic closing. When the controller on the circuit board 35 receives a tripping action signal, the motor 33 and the gear transmission device 32 and through the tripping drive structure make the L-pole operating mechanism 15 and the N-pole operating mechanism 25 act synchronously to achieve automatic tripping.

[0035] The leakage protection module realizes the automatic tripping function through the reclosing pole module 3. After the leakage protection module detects a leakage signal, the leakage protection module makes the circuit breaker trip through the reclosing pole module 3. The leakage protection module further includes a test button circuit. When the test button circuit is turned on, the leakage protection module can also drive the circuit breaker to trip through the reclosing pole module 3.

[0036] As Figure 6 , 9 shown in Figure 10, the leakage protection module includes a zero-sequence current transformer 41, a leakage tripping device 42 and a test button circuit. The zero-sequence current transformer 41 and the leakage tripping device 42 are arranged in the N-phase pole module 2. The test button circuit is arranged in the reclosing pole module 3. The leakage tripping device 42 and the test button circuit are connected to the circuit board 35 in the reclosing pole module 3. The conduction and disconnection of the test button circuit are controlled by a micro switch 44. The micro switch 44 is arranged on the circuit board 35 in the reclosing pole module 3. A test button 43 is arranged in the reclosing pole module 3. The test button 43 is used to cooperate with the micro switch 44 to turn on or off the test button circuit. After the zero-sequence current transformer 41 detects a leakage current, the controller on the circuit board 35 of the reclosing pole module 3 drives the leakage tripping device 42 to act to make the circuit breaker trip. When the test button circuit is turned on, the zero-sequence current transformer 41 detects an analog leakage current generated by the test button circuit. The controller on the circuit board 35 of the reclosing pole module 3 drives the leakage tripping device 42 to act and makes the circuit breaker trip.

[0037] One improvement of this application lies in that in the L-phase pole module 1, a double-metal component for implementing overload protection is not provided. Instead, an electric current transformer 19 is set to collect current signals to determine whether an overload occurs in the main circuit of the circuit breaker. The electric current transformer 19 is connected to the circuit board 35 of the reclosing pole module 3 for feeding back the current signal of the main circuit, and the controller on the circuit board 35 can feed back the power consumption situation of the main circuit to the user terminal. When an overcurrent occurs in the main circuit of the circuit breaker, the electric current transformer 19 feeds back the main circuit current magnitude signal to the controller of the circuit board 45. After the controller determines that an overload occurs, the controller of the circuit board 35 drives the reclosing pole module 3 to act within a specified time to achieve automatic tripping of the circuit breaker. The controller is provided with a control module, and the control module is used to judge whether the current fed back by the electric current transformer is an overload current and control the motor 3 of the reclosing pole module 3. Preferably, the control module of the controller can trigger the action of the reclosing pole module 3 within a specified time according to the set program. This kind of overload protection has higher stability and accuracy compared with the existing double-metal component. The controller of the reclosing pole module 3 can be a microprocessor MCU or a control circuit composed of electronic components, preferably a microprocessor MCU.

[0038] As Figure 4 、 5 shown, the L-phase pole module 1 includes a pair of L-pole incoming line terminals 12 and L-pole outgoing line terminals 13 arranged on both sides of the L-phase pole module 1. An L-pole handle structure 14 and an L-pole operating mechanism 15 are arranged between the L-pole incoming line terminal 12 and the L-pole outgoing line terminal 13. An L-pole moving contact of the L-pole contact mechanism 16 is connected to the L-pole operating mechanism 15. An electric current transformer 19 is arranged between the L-pole moving contact and the L-pole incoming line terminal 12. The connecting wire 1a connected between the L-pole moving contact and the L-pole incoming line terminal 12 passes through the electric current transformer 19. The electric current transformer 19 is connected to the circuit board 35 of the reclosing pole module 3 for feeding back the current signal of the main circuit to the controller of the circuit board 35.

[0039] Specifically as Figure 4As shown in the figure, the L-phase pole module 1 includes an L-phase pole module housing. Inside the phase pole module housing, there are a pair of L-pole connection terminals, an L-pole operating mechanism 15, an L-pole contact mechanism 16, a short-circuit protection mechanism 17, an arc extinguishing chamber 18, and a current transformer 19. The pair of L-pole connection terminals are respectively arranged on both sides of the L-phase pole module 1 as the L-pole incoming line terminal 12 and the L-pole outgoing line terminal 13. The L-pole operating mechanism 15 is arranged in the upper part inside the L-phase pole module housing and is located between the L-pole incoming line terminal 12 and the L-pole outgoing line terminal 13. The short-circuit protection mechanism 17 and the arc extinguishing chamber 18 are arranged on one side of the L-pole operating mechanism 15, and the arc extinguishing chamber 18 is located below the short-circuit protection mechanism 17. An L-pole contact mechanism 16 is arranged on one side of the arc extinguishing chamber 18. Among them, the L-pole static contact of the L-pole contact mechanism 16 is fixed on one side of the arc extinguishing chamber 18, the L-pole moving contact in the L-pole contact mechanism 16 is connected to the L-pole operating mechanism 15, and the L-pole moving contact and the L-pole static contact are arranged opposite to each other. The current transformer 19 is arranged on the other side of the L-pole moving contact. The connecting wire 1a connecting the L-pole moving contact and the L-pole incoming line terminal 12 passes through the current transformer 19. The current transformer 19 is connected to the circuit board 35 of the reclosing pole module 3 through a wire. A first arcing plate 1b is arranged below the current transformer 19. One end of the first arcing plate 1b is connected to the L-pole incoming line terminal 12 through a wire, and the other end of the first arcing plate 1b extends into the arc extinguishing chamber 18.

[0040] The L-pole operating mechanism 15 includes a support, a lever, a tripping latch, a locking latch, and a contact support. The support is rotatably installed inside the L-phase pole module housing. The tripping latch and the locking latch are rotatably installed on the support. The contact support is connected to the support. One end of the lever is connected to the L-pole handle structure 141, and the other end is connected to the tripping latch. The tripping latch is latched and connected to an end arm of the locking latch. One end of the contact support is connected to the L-pole moving contact of the L-pole contact mechanism 16. The L-pole moving contact and the L-pole static contact fixedly arranged inside the L-phase pole module housing are arranged opposite to each other. One side of the other end arm of the locking latch is arranged opposite to the electromagnetic release in the short-circuit protection mechanism 17. An assembly hole is provided in the middle of the locking latch. An L-pole locking latch linkage shaft 151 is installed in the assembly hole, and the L-pole locking latch linkage shaft 151 connects the L-pole operating mechanism 15 and the N-pole locking latch linkage 251 of the N-pole operating mechanism 25.

[0041] The short-circuit protection mechanism 17 includes an electromagnetic release. The electromagnetic release includes an electromagnetic coil. One end of the electromagnetic coil is provided with a striker. The striker is opposite to an end arm of the locking latch. When a short circuit occurs in the main circuit, the striker moves to make the locking latch rotate, and the latched connection between the locking latch and the tripping latch is unlocked, and the circuit breaker module trips.

[0042] As Figure 4 、 5As shown, an arc isolation structure is provided in the middle of the housing of the L-phase pole module. The arc isolation structure includes a first partition plate 111 and a plurality of second partition plates 112. The first partition plate 111 is disposed between the moving contact of the L-pole and the current transformer 19 to prevent the influx of electric arcs or high-temperature gases into the space where the current transformer 19 is located, and to prevent the electric arcs or high-temperature gases from affecting the current transformer 19. The plurality of second partition plates 112 are arranged at intervals to form an unclosed buffer chamber 113. The buffer chamber 113 is located between the outgoing line terminal 13 of the L-pole and the arc extinguishing chamber 18. The electric arcs discharged from the arc extinguishing chamber 18 are cut into multiple segments by the plurality of second partition plates 112 arranged at intervals. Part of the electric arcs flow into the buffer chamber 113 to cool the exhaust gas of the electric arc. Preferably, the buffer chamber 113 formed by the plurality of second partition plates 112 arranged at intervals has multiple inlets for the exhaust gas of the electric arc. In Figure 4 , 5 , the buffer chamber 113 has two inlets. One inlet faces the arc extinguishing chamber 18, which is conducive to the smooth inflow of the exhaust gas of the electric arc discharged from the arc extinguishing chamber 18 into the buffer chamber 113 to be cooled and buffered. The other inlet corresponds to the exhaust hole of the housing of the L-phase pole module.

[0043] Preferably, the housing of the L-phase pole module is composed of an L-phase pole cover 11b and an L-phase pole base 11a. The first partition plate 111 is provided on both the L-phase pole cover 11b and the L-phase pole base 11a. A plurality of second partition plates 112 are provided on both the L-phase pole cover 11b and the L-phase pole base 11a. When the L-phase pole cover 11b and the L-phase pole base 11a are closed to form the housing of the L-phase pole module, the first partition plates 111 provided on the L-phase pole cover 11b and the L-phase pole base 11a are butt-jointed to block electric arcs or high-temperature gases, and the plurality of second partition plates 112 provided on the L-phase pole cover 11b and the L-phase pole base 11a are butt-jointed to form a buffer chamber. Of course, the first partition plate 111 and the second partition plate 112 can be provided only on the L-phase pole base 11a. When the L-phase pole cover 11b is closed on the L-phase pole base 11a, the first partition plate 111 and the second partition plate 112 are in contact with the L-phase pole cover 11b. It should be noted that at least two through holes are provided on the L-phase pole cover 11b. One through hole is for the L-pole lock linkage shaft 151 to pass through, and the other through hole is for realizing the linkage of the L-pole handle structure 14 and the N-pole handle structure 24.

[0044] As Figure 3 , 6 , 7 shows, the N-phase pole module 2 includes a housing of the N-phase pole module. Inside the housing of the N-phase pole module, an N-pole handle structure 24, an N-pole operating mechanism 25, an N-pole contact mechanism 26, and a pair of N-pole connection terminals are provided. The structures and installation positions of the four are the same as those of the L-pole handle structure 14, the L-pole operating mechanism 15, the L-pole contact mechanism 16, and the L-pole connection terminals in the L-phase pole module 1.

[0045] AsFigure 6 , 7 As shown, the N-pole handle structure 24 is linked with the L-pole handle structure 14. The N-pole operating mechanism 25 is the same as the L-pole operating mechanism 15 and is linked through the L-pole latch linkage shaft 151 provided on the L-pole operating mechanism 15. The N-pole latch linkage shaft 251 in the N-pole operating mechanism 25 is used to cooperate with the tripping drive structure in the reclosing pole module 3. The tripping drive structure pushes the N-pole latch linkage shaft 251 of the N-pole operating mechanism 25 to rotate. Under the linkage action of the L-pole latch linkage shaft 151 of the L-pole operating mechanism 15, the L-pole operating mechanism 15 and the N-pole operating mechanism 25 perform tripping actions synchronously, realizing the synchronous opening of the L-phase pole module 1 and the N-phase pole module 2.

[0046] The pair of N-pole terminal blocks are respectively arranged on both sides of the N-phase pole module housing. One N-pole terminal block serves as the N-pole outgoing line terminal 23, and the other N-pole terminal block serves as the N-pole incoming line terminal 22. The N-pole handle structure 24 and the N-pole operating mechanism 25 are arranged on the upper part of the N-phase pole module housing. The N-pole moving contact in the N-pole contact mechanism 26 is connected to the N-pole operating mechanism 25. The N-pole moving contact is connected to the N-pole incoming line terminal 22 through a wire. The N-pole moving contact is located in the middle of the N-phase pole module housing. The N-pole static contact of the N-pole contact mechanism 26 is fixedly installed in the middle of the N-phase pole module housing and is arranged opposite to the N-pole moving contact. The N-pole static contact is connected to the N-pole outgoing line terminal 23 through a wire; a second arcing plate 2b is also arranged in the N-phase pole module housing. One end of the second arcing plate 2b is connected to the N-pole incoming line terminal 22 through a wire.

[0047] In the N-phase pole module 2, a zero-sequence current transformer 41 and a leakage tripping device 42 of the leakage protection module are provided. The zero-sequence current transformer 41 and the leakage tripping device 42 are arranged between the N-pole outgoing line terminal 23 and the N-pole static contact. The main circuit wires of the L-phase pole module 1 and the main circuit wires in the N-phase pole module 2 need to pass through the zero-sequence current transformer 41. The zero-sequence current transformer 41 and the leakage tripping device 42 are connected to the circuit board 35 in the reclosing pole module 3 through wires. The leakage tripping device 42 is arranged between the zero-sequence current transformer 41 and the N-pole handle structure 24. The tripping iron core of the leakage tripping device 42 is opposite to the latch of the N-pole operating mechanism 25. When the tripping iron core of the leakage tripping device 42 acts, it can trigger the unlocking of the latch and the trip of the N-pole operating mechanism 25. At the same time, under the linkage action of the N-pole operating mechanism 25 and the L-pole operating mechanism 15, synchronous opening is realized; preferably, a magnetic yoke 421 is covered on the leakage tripping device 42. The magnetic yoke 421 covers the leakage tripping device 42 and is used to enhance the electromagnetic force of the leakage tripping device 42, so that the leakage tripping device 42 can be miniaturized or can still operate reliably at a low voltage (such as 12V).

[0048] As Figure 6 , 7As shown, a third partition plate 211 is further provided in the N-phase pole module housing. The third partition plate 211 is disposed between the N-pole moving contact and the N-pole incoming line terminal 22, and is used to prevent the arc backspray that occurs during the breaking process of the N-pole contact mechanism 26. Preferably, an arc extinguishing chamber 212a is provided between the third partition plate 211 and the zero-sequence current transformer 41. One end of the second arc guiding plate 2b extends into the arc extinguishing chamber 212a. An arc running channel 212b is provided at the end of the arc extinguishing chamber 212a. The arc running channel 212b is connected to the exhaust hole provided on one side of the N-phase pole module housing. The arc extinguishing chamber 212a includes a first chamber wall 212 and a second chamber wall 213. The first chamber wall 212 is located in the middle of the N-phase pole module housing. The head end of the first chamber wall 212 is located in the middle of the N-phase pole module housing. The middle part of the first chamber wall 212 is arranged around one side of the zero-sequence current transformer 41. A gap is left between the part of the first chamber wall 212 near the tail end and the inner wall of the N-phase pole module housing as the arc running channel 212b. The tail end of the first chamber wall 212 is opposite to the exhaust hole of the N-phase pole module housing. The head end of the second chamber wall 213 is connected to the third partition plate 211, and the tail end of the second chamber wall 213 is connected to the inner wall of the side of the N-phase pole module housing provided with the exhaust hole.

[0049] Preferably, the N-phase pole module housing is composed of an N-phase pole cover 21b and an N-phase pole base 21a. The third partition plate 211 is provided on both the N-phase pole cover 21b and the N-phase pole base 21a. The first chamber wall 212 and the second chamber wall 213 are provided on both the N-phase pole cover 21b and the N-phase pole base 21a. When the N-phase pole cover 21b and the N-phase pole base 21a are closed to form the N-phase pole module housing, the third partition plates 211 provided on the N-phase pole cover 21b and the N-phase pole base 21a are butted to form a structure for preventing arc backspray. The first chamber walls 212 and the second chamber walls 213 provided on the L-phase pole cover 11b and the L-phase pole base 11a are respectively butted to form the arc extinguishing chamber 212a. Of course, the third partition plate 211, the first chamber wall 212 and the second chamber wall 213 can be only provided on the N-phase pole base 21a. When the N-phase pole cover 21b is closed on the N-phase pole base 21a, the third partition plate 211, the first chamber wall 212 and the second chamber wall 213 are in contact with the N-phase pole cover 21b. It should be noted that a through hole is provided on the N-phase pole cover 21b for the N-pole handle structure 24 to be linked with the driving handle 31 of the reclosing pole module 3.

[0050] As Figure 3 , 9 -12 shows, the reclosing pole module 3 includes a reclosing pole module housing. Inside the reclosing pole module housing, there are provided a driving handle 31, a gear transmission device 32, a tripping driving structure, a motor 33, a circuit board 35 and a test button 43 (for the circuit board 35, reference can be specifically made to Figure 12), the circuit board 35 is arranged inside the housing of the reclosing gate module, and the circuit board 35 is respectively connected to the L-pole incoming line terminal 12 and the N-pole incoming line terminal 22, and is used to control the power supply of the circuit board 35 or the temperature rise data feedback of the incoming line end; the driving handle 31, the gear transmission device 32 and the motor 33 are arranged on the surface of the circuit board 35, and are stacked. The driving handle 31 and the test button 43 are respectively arranged on both sides of the upper part of the housing of the reclosing module, and the driving handle 31 and the gear transmission device 32 are rotated in coordination with a driving connecting rod 34, and the gear transmission device 32 is connected to the motor 33 in transmission. The motor 33 drives the driving connecting rod 34 through the gear transmission device 32 to drive the driving handle 31 to realize automatic closing, and when the controller of the circuit board 35 receives the closing action After the signal is received, the driving motor 33 rotates, and the gear transmission device 32 and the driving connecting rod 34 cooperate with each other to activate the L-pole operating mechanism 15 and the N-pole operating mechanism 25 to realize automatic closing; the tripping driving structure is arranged on the side of the gear transmission device 32 facing the circuit board 35, and the driving motor 33 rotates after the controller of the circuit board 35 receives the opening action signal, and with the cooperation of the gear transmission device 32 and the tripping driving structure, the L-pole operating mechanism 15 and the N-pole operating mechanism 25 are tripped to realize automatic opening; the test button 43 can be arranged on any side of the line, which is used to operate the on and off of the test button circuit in the leakage protection module. When the test button circuit is turned on, the zero-sequence transformer 41 detects the leakage signal and the leakage release 42 triggers the opening of the circuit breaker.

[0051] The driving handle 31 is arranged at the upper part of the reclosing gate module 3, the motor 33 is arranged at the lower part of the reclosing gate module 3, the gear transmission device 32 is arranged in the middle part of the housing of the reclosing gate module, one end of the gear transmission device 32 is connected to the motor 33, and the other end of the gear transmission device 32 is connected to the driving handle 31 through a driving connecting rod 34. A tripping driving structure is provided on the side of the gear transmission device 32 facing the circuit board 35. The tripping driving structure is used to cooperate with the N-pole locking linkage shaft 251 of the N-pole operating mechanism 25. The tripping driving structure drives the N-pole locking linkage shaft 251 of the N-pole operating mechanism 25 to move and realize synchronous opening of the N-phase pole module 2 and the L-phase pole module 1 under the linkage action.

[0052] like Figure 11As shown, the gear transmission device 32 includes three successively meshing first gear 321, second gear 322 and third gear 323. The first gear 321 is meshed with the motor 33 through a worm. On one side of the third gear 323 facing away from the circuit board 35, a driving link 34 is provided. One end of the driving link 34 is connected to one side of the third gear 323 as a connection end, and the other end of the driving link 34 is a driving end that cooperates with the third gear 323 to drive the driving handle 31 to rotate. On the side of the third gear 323 facing the circuit board 35, a tripping driving structure is provided. The tripping driving structure includes a tripping driving member 36 and a driving protrusion (not shown). One end of the tripping driving member 36 is rotatably installed on the reclosing pole module housing, and the other end of the tripping driving member 36 is correspondingly arranged with the N-pole locking linkage shaft 251 of the N-pole operating mechanism 25. The driving protrusion is arranged on the side of the third gear 323 facing the circuit board 35 and is in contact connection with the tripping driving member 36 through rotation, so as to drive the tripping driving member 36 to push the N-pole locking linkage shaft 251 of the N-pole operating mechanism 25 to unlock the lock and trip latch in the N-pole operating mechanism 25, and complete the tripping action. In this way, the tripping driving structure has the advantages of simple and reliable structure and being convenient for resetting after tripping.

[0053] Combine Figures 9-11 Provide an embodiment in which the driving handle 31 cooperates with the gear transmission device 32. The driving handle 31 has a protruding handle portion 311. A track groove 371 for cooperating with the driving end of the driving link 34 is provided below the driving handle 31. As the third gear 323 rotates for closing and opening, the driving link 34 slides along the track groove 371, and the driving end rotates the driving handle 31 by pushing the handle portion 311; when the motor 33 drives the gear transmission device 32 to rotate for closing, Figure 11 the rotation direction of the third gear 323 is counterclockwise. At this time, the driving end of the driving link 34 slides from the inner end of the track groove 371 to the outer end of the track groove 371. After the driving end contacts the handle portion 311, the driving handle 31 is rotated for closing by pushing the handle portion 311, and the closing rotation direction of the driving handle 31 is clockwise; when the motor 33 drives the gear transmission device 32 to rotate for opening, Figure 11The rotation direction of the third gear 323 is clockwise. At this time, the gear transmission device 32 causes the tripping drive structure to drive the N-pole locking linkage shaft 251 of the N-pole operating mechanism 25, and under the linkage action, the L-phase pole module 1 and the N-phase pole module 2 synchronously complete the tripping action. At the same time, the gear transmission device 32 drives the driving end of the connecting rod 34 to slide from the outer end of the track groove 371 to the inner end of the track groove 371, and the handle part 311 rotates counterclockwise for opening after the pushing action of the driving end is removed. It should be noted that an avoidance groove 352 for the driving protrusion of the third gear 323 to move is provided on the circuit board 35, and through holes for the respective locking linkage shafts to achieve linkage and rotation are provided on the reclosing pole module housing, the N-phase pole module housing, and the L-phase pole module housing.

[0054] Different from the installation position of the existing test button 43, as Figure 1 、 2 shown in FIGS. 9 - 11, the test button 43 of the present application is arranged on the reclosing pole module 3. The test button 43 penetrates through the upper part of the reclosing pole module 3 and is located on the side opposite to the driving handle 31. The test button circuit of the leakage protection module is connected to the circuit board 35, and the micro switch 44 for controlling the on-off of the test button circuit is also arranged on the circuit board 35. One end of the test button 43 extending into the reclosing module is used to press the micro switch 44 on the circuit board 35.

[0055] The test button 43 has two pressing parts. One pressing part, as the first pressing part, slides through an installation groove provided on the reclosing pole module housing, and the other pressing part, as the second pressing part, is used to press the micro switch 44 of the circuit board 35 and is located inside the reclosing pole module housing. Preferably, a limiting structure that cooperates with each other is provided between the test button 43 and the reclosing pole module housing. The limiting structure is used to limit the stroke of the test button 43 extending out of the reclosing pole module housing. Under the action of the limiting structure, when the test button 43 is pressed, it can avoid excessive protrusion of the test button 43.

[0056] As Figure 2 、 10, as shown in FIGS. 11, the limiting structure includes a first limiting boss 372 disposed inside the housing of the reclosing pole module and a second limiting boss 431 disposed on the test button 43. The first limiting boss 372 faces the first pressing portion. Preferably, a return spring 373 is disposed between the first limiting boss 372 and the first pressing portion. The second limiting boss 431 protrudes from one side of the test button 43 for limiting and cooperating with the inner wall of the housing of the reclosing pole module. The structure for limiting and cooperating with the second limiting boss 431 can be a protruding structure, a groove structure or other structures capable of realizing limiting cooperation disposed inside the housing of the reclosing pole module. In this application, the limiting cooperation is achieved by means of the shape of the housing of the reclosing pole module and the second limiting boss 431. The upper side wall of the housing of the reclosing pole module protrudes outward, making the overall shape of the housing of the reclosing pole module "convex". The upper side wall of the reclosing pole module 3 is a stepped surface that is high in the middle and low on both sides. The housing of the reclosing pole module is composed of a base 37 and an upper cover 38. The first limiting boss 372 is disposed on the base 37, and a return spring 373 is disposed between the first limiting boss 372 and the first pressing portion. The test button 43 is inserted through the upper part of the base. Preferably, the second limiting boss 431 is disposed on one side of the second pressing portion. The second limiting boss 431 is engaged with the stepped surface of the upper cover 38 to limit the travel of the test button 43 protruding from the housing of the reclosing pole module. This structure in which the first limiting boss 372 and the structure for limiting and cooperating with the second limiting boss 431 are respectively disposed on the base 37 and the test button 43 facilitates the installation of the test button 43. Of course, the second limiting boss 431 can also be disposed at other positions of the test button 43, and the second limiting boss 431 can also cooperate with other structures of the housing of the reclosing pole module to limit the travel of the test button 43.

[0057] An indicator light is provided on the reclosing pole module 3, and the indicator light is used to display the working state of the circuit breaker. The indicator light includes a test button 43 inserted through the reclosing pole module 3 and a light-emitting element 351 disposed inside the reclosing pole module 3 (see Figure 10 ). The test button 43 is disposed near the light-emitting element 351. The test button 43 serves as a light guide column to export the working state of the light-emitting element 351 outside the reclosing pole module 3 for displaying the working state of the circuit breaker. This structure in which the test button 43 also serves as a light guide column, compared with placing the indicator light in the test button 43, when the test button 43 is pressed, the indicator light will not pop out, and this structure is beneficial to reducing the volume of the circuit breaker and can also avoid opening too many mounting holes on the circuit breaker.

[0058] Preferably, the light-emitting element 351 in the indicator light is a light-emitting diode, and the test button 43 is a translucent part made of PC material. Of course, other translucent materials can also be used to make the test button 43. The light-emitting diode is arranged at a position on the circuit board 35 close to the test button 43. In Figure 10 it, the light-emitting diode is arranged at the upper part of the circuit board 35, and the test button 43 transmits the lighting condition of the light-emitting diode to the outside of the reclosing pole module 3 to indicate the state of the circuit breaker. Preferably, different colors or different brightness or flashing frequencies of the light-emitting diode are used to display different states of the circuit breaker, that is, the indicator light can indicate that the circuit breaker is in a normal working state, a leakage state, an overload state, a short circuit or over / under voltage state, or can also display an arrears or normal charge state. Of course, the number of the light-emitting elements 351 can be multiple, corresponding to different working states of the circuit breaker respectively.

[0059] As Figure 1 、 9 shown, a change-over switch 39 is further arranged in the reclosing pole module 3. The change-over switch 39 is located between the driving handle 31 and the test button 43. The change-over switch 39 is used to drive the circuit breaker module to be set to a manual mode or an automatic mode. In the manual mode, the product cannot be automatically switched on, and manual switching-on is required. The change-over switch 39 includes a toggle switch 391 and a push plate 392. The toggle switch 391 is arranged on the circuit board 35, and the push plate 392 is arranged on the surface of the toggle switch 391 to push the toggle switch 391. Preferably, the push plate 392 is located between the toggle switch 391 and the reclosing pole module housing and can slide between the toggle switch 391 and the reclosing pole module. An opening corresponding to the push plate 392 is provided in the reclosing pole module housing to push the push plate 392, and the manual mode or the automatic mode is switched by pushing the push plate 392. The toggle switch 391 is connected to the power supply return circuit of the motor 33, or the control circuit of the automatic opening control circuit, or is connected to the controller in the reclosing pole module 3 as a parameter signal

[0060] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A leakage circuit breaker, comprising an L-phase pole module (1), an N-phase pole module (2), a reclosing pole module (3) and a leakage protection module, characterized in that: The L-phase pole module (1) includes a pair of L-pole incoming terminals (12) and L-pole outgoing terminals (13) arranged on both sides of the L-phase pole module (1). An L-pole handle structure (14) and an L-pole operating mechanism (15) are arranged between the L-pole incoming terminal (12) and the L-pole outgoing terminal (13). The moving contact of the L-pole contact mechanism (16) is connected to the L-pole operating mechanism (15). A current transformer (19) is arranged between the moving contact of the L-pole and the L-pole incoming terminal (12). The connecting wire (1a) connecting the moving contact of the L-pole and the L-pole incoming terminal (12) passes through the current transformer (19). The current transformer (19) is connected to the circuit board (35) of the reclosing pole module (3) to feedback the current signal of the main line to the controller on the circuit board (35). When overloaded, the controller of the circuit board (35) drives the reclosing pole module (3) to act to achieve automatic tripping. The leakage protection module includes a zero-sequence current transformer (41) and a leakage tripping device (42). The zero-sequence current transformer (41) and the leakage tripping device (42) are arranged in the N-phase pole module (2). The N-phase pole module (2) includes an N-phase pole module housing. An N-pole operating mechanism (25), an N-pole contact mechanism (26), a pair of N-pole connection terminals and a third partition (211) are arranged inside the N-phase pole module housing. The N-pole handle structure (24) and the N-pole operating mechanism (25) are arranged at the upper part of the N-phase pole module housing. The moving contact of the N-pole in the N-pole contact mechanism (26) is connected to the N-pole operating mechanism (25). The moving contact of the N-pole is located in the middle of the N-phase pole module housing. The static contact of the N-pole in the N-pole contact mechanism (26) is fixedly installed in the middle of the N-phase pole module housing and is arranged opposite to the moving contact of the N-pole. The leakage tripping device (42) is arranged between the zero-sequence current transformer (41) and the N-pole handle structure (24). An arc extinguishing chamber (212a) is arranged between the third partition (211) and the zero-sequence current transformer (41). The arc extinguishing chamber (212a) includes a first chamber wall (212) and a second chamber wall (213). The head end of the first chamber wall (212) is located in the middle of the N-phase pole module housing. The middle part of the first chamber wall (212) is arranged around one side of the zero-sequence current transformer (41). A gap is left between the part of the first chamber wall (212) near the tail end and the inner wall of the N-phase pole module housing as an arc running channel (212b). The tail end of the first chamber wall (212) is opposite to the exhaust hole of the N-phase pole module housing. The head end of the second chamber wall (213) is connected to the third partition (211). The tail end of the second chamber wall (213) is connected to the inner wall of one side of the N-phase pole module housing provided with an exhaust hole.

2. The leakage circuit breaker according to claim 1, characterized in that: The N-phase pole module (2) includes an N-pole operating mechanism (25) and an N-pole contact mechanism (26), and the reclosing pole module (3) includes a driving handle (31) and a tripping drive structure; the N-pole handle structure (24) is linked with the L-pole handle structure (14), the N-pole operating mechanism (25) is the same as the L-pole operating mechanism (15) and is linked and connected through an L-pole latch linkage shaft (151) provided on the L-pole operating mechanism (15), and the N-pole latch linkage shaft (251) in the N-pole operating mechanism (25) is used to cooperate with the tripping drive structure in the reclosing pole module (3). The tripping drive structure pushes the N-pole latch linkage shaft (251) of the N-pole operating mechanism (25) to rotate, and under the linkage action of the L-pole latch linkage shaft (151) of the L-pole operating mechanism (15), the L-pole operating mechanism (15) and the N-pole operating mechanism (25) perform tripping actions synchronously.

3. The leakage circuit breaker according to claim 2, wherein: The driving handle (31) is linked with the L-pole handle structure (14) and the N-pole handle structure (24) through a handle linkage shaft. After receiving a closing action instruction, the reclosing pole module (3) enables the L-phase pole module (1) and the N-phase pole module (2) to realize an automatic closing function under the action of the handle linkage shaft.

4. A leakage circuit breaker according to claim 1, characterized in that: The N-phase pole module (2) is arranged between the L-phase pole module (1) and the reclosing pole module (3), and the leakage protection modules are dispersedly arranged in the N-phase pole module (2) and the reclosing pole module (3); the leakage protection module includes a test button circuit. The test button circuit is arranged in the reclosing pole module (3), and the leakage tripping device (42) and the test button circuit are connected to the circuit board (35) of the reclosing pole module (3). The on-off of the test button circuit is operated by a test button (43) provided in the reclosing pole module (3).

5. A leakage circuit breaker according to claim 4, characterized in that: A yoke (421) for enhancing the electromagnetic force of the leakage tripping device (42) is covered on the leakage tripping device (42).

6. A leakage circuit breaker according to claim 4, characterized in that: The on-off of the test button circuit is controlled by a microswitch (44). The microswitch (44) is arranged on the circuit board (35) of the reclosing pole module (3), and the test button (43) is used to operate the on-off of the test button circuit by cooperating with the microswitch (44).

7. The leakage circuit breaker according to claim 1, characterized in that: A pair of N-pole terminal blocks are respectively arranged on both sides of the N-phase pole module housing. One of the N-pole terminal blocks serves as the N-pole outgoing line terminal (23), and the other N-pole terminal block serves as the N-pole incoming line terminal (22). The N-pole moving contact is connected to the N-pole incoming line terminal (22) through a wire, and the N-pole static contact is connected to the N-pole outgoing line terminal (23) through a wire; The third partition plate (211) is arranged between the N-pole moving contact and the N-pole incoming line terminal (22) to prevent the arc backspray that occurs during the breaking process of the N-pole contact mechanism (26).

8. A leakage circuit breaker according to claim 1, characterized in that: The L-phase pole module (1) comprises an L-phase pole module housing, an arc isolation structure is provided in the middle of the L-phase pole module housing, the arc isolation structure comprises a first partition (111) and a plurality of second partitions (112), the first partition (111) being arranged between the L-pole moving contact and the current transformer (19) to prevent an electric arc or high-temperature gas from flowing into a space where the current transformer (19) is located; the plurality of second partitions (112) are arranged in a spaced-apart manner to form an unenclosed buffer chamber (113), the buffer chamber (113) being located between the L-pole outlet terminal (13) and the arc extinguishing chamber (18).

9. A leakage circuit breaker according to claim 1, characterized in that: The reclosing gate module (3) is also provided with a switching switch (39), the switching switch (39) is located between the driving handle (31) and the test button (43), and the switching switch (39) is driven to set the circuit breaker module to a manual mode or an automatic mode; the switching switch (39) comprises a toggle switch (391) and a push plate (392), the toggle switch (391) is arranged on the circuit board (35), the push plate (392) is arranged on the surface of the toggle switch (391) and is used to push the toggle switch (391), and an opening corresponding to the push plate (392) is provided on the reclosing gate module (3) and is used to push the push plate (392).

10. A leakage circuit breaker according to claim 1, characterized in that: The reclosing gate module (3) comprises a reclosing gate module housing, and a driving handle (31), a gear transmission device (32), a tripping driving structure, a motor (33), and a circuit board (35) are arranged inside the reclosing gate module housing; the driving handle (31), the gear transmission device (32), and the motor (33) are arranged on the surface of the circuit board (35); the driving handle (31) and the gear transmission device (32) are rotated in coordination with each other through a driving connecting rod (34); the gear transmission device (32) and the motor (33) are connected in driving connection; the motor (33) is connected in driving connection through a gear transmission device The device (32) drives the driving connecting rod (34) to drive the driving handle (31) to realize automatic closing; the tripping driving structure is arranged on the side of the gear transmission device (32) facing the circuit board, and the tripping driving structure includes a driving boss arranged on the gear transmission device (32) and a tripping driving member (36) rotatably mounted on the housing of the reclosing gate module, one end of the tripping driving member (36) is rotatably mounted on the housing of the reclosing gate module, and the other end of the tripping driving member (36) is arranged corresponding to the N-pole locking linkage shaft (251) of the N-pole operating mechanism (25).

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