breaker

Abstract

A circuit breaker includes a handle rotatably mounted on a housing, an L-pole contact mechanism, and an N-pole contact mechanism. The L-pole contact mechanism and the N-pole contact mechanism are coaxially pivotally mounted within the housing. The L-pole contact mechanism and the N-pole contact mechanism are driven by the handle to close with corresponding static contacts via a first U-shaped rod and a second U-shaped rod, respectively. The L-pole contact mechanism and the N-pole contact mechanism are driven to open via a first drive spring and a second drive spring, respectively. The L-pole contact mechanism includes an L-pole trip lock mechanism, and the N-pole contact mechanism includes an N-pole trip lock mechanism. The L-pole contact mechanism is further provided with a push portion. When the circuit breaker trips, the L-pole trip lock mechanism is unlocked, and the L-pole contact mechanism opens. The push portion of the L-pole contact mechanism moves a preset distance in the opening direction, triggering the unlocking of the N-pole trip lock mechanism. The N-pole contact mechanism opens later than the L-pole contact mechanism. The circuit breaker of the present invention controls the opening of the N-pole and L-pole contact mechanisms by a preset distance.

Description

Technical Field

[0001] The present invention relates to a circuit protector, in particular to a circuit breaker. Background Art

[0002] The circuit breaker also has protection functions such as overload and short circuit. The circuit breaker can automatically disconnect when the circuit current exceeds the preset value. It is mainly used to ensure electrical safety, protect personal safety, and prevent electric shock accidents.

[0003] From the perspective of safety and space conservation, there is increasing demand for compact 1P+N circuit breakers with a N-pole breakpoint. However, due to the limited space within the circuit breaker housing, the arc-extinguishing capability of the N-pole is limited. Therefore, to protect the N-pole contact, the N-pole contact spacing is typically reduced, allowing it to close before the L-pole contact, resulting in staggered operation of the L-pole and N-pole contacts. Even so, the time difference between the N-pole and L-pole contacts opening is still limited, and the reduced N-pole contact spacing is still not conducive to arc extinguishing during a short circuit. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a circuit breaker with compact structure and high reliability.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A circuit breaker includes a handle rotatably mounted on a housing, an L-pole contact mechanism, and an N-pole contact mechanism. The L-pole contact mechanism and the N-pole contact mechanism are coaxially pivotally mounted in the housing. The L-pole contact mechanism and the N-pole contact mechanism are driven by the handle to close with corresponding static contacts via a first U-shaped rod and a second U-shaped rod, respectively. The L-pole contact mechanism and the N-pole contact mechanism are driven to open via a first drive spring and a second drive spring, respectively. The L-pole contact mechanism includes an L-pole trip locking mechanism, and the N-pole contact mechanism includes an N-pole trip locking mechanism. The L-pole contact mechanism is further provided with a pushing portion. When the circuit breaker trips, the L-pole trip locking mechanism is unlocked and the L-pole contact mechanism is opened. The pushing portion of the L-pole contact mechanism moves a preset distance in the opening direction, thereby triggering the unlocking of the N-pole trip locking mechanism, and the N-pole contact mechanism is opened. The N-pole contact mechanism is opened later than the L-pole contact mechanism.

[0007] Furthermore, the L-pole contact mechanism includes a lever and an L-pole moving contact, the lever is connected to the L-pole moving contact, and the pushing portion is arranged on a side of the lever close to the N-pole contact mechanism.

[0008] Furthermore, the L-pole trip locking mechanism also includes a trip buckle and a lock buckle, which are pivotally arranged on a lever. After closing the switch, the trip buckle and the lock buckle are buckled and locked with the lever as a whole. When tripping, the trip buckle and the lock buckle are unlocked, and the L-pole moving contact and the static contact are separated.

[0009] Furthermore, one end of the second U-shaped rod is connected to the handle, and the other end is connected to the N-pole contact mechanism. The end of the second U-shaped rod connected to the N-pole contact mechanism serves as a sliding end. The N-pole trip locking mechanism includes a limiting portion arranged on the N-pole contact mechanism and a sliding end arranged on the second U-shaped rod. When closing the circuit, the handle pushes the second U-shaped rod, and the sliding end of the second U-shaped rod abuts against the limiting portion on the N-pole contact mechanism, and pushes the N-pole contact mechanism to close the circuit by pushing the limiting portion; after closing the circuit, the sliding end maintains a limiting fit with the limiting portion, and the N-pole trip locking mechanism is locked; when tripping, the pushing portion on the L-pole contact mechanism pushes the sliding end of the second U-shaped rod to release the limiting fit with the limiting portion, and the N-pole trip locking mechanism is unlocked.

[0010] Furthermore, the pushing portion is a protrusion extending from the L-pole contact mechanism toward the N-pole contact mechanism, the protrusion is wedge-shaped with a thin top and a thick bottom, and the contact surface between the pushing portion and the sliding end is an inclined surface.

[0011] Furthermore, the N-pole contact mechanism includes an N-pole moving contact, the limiting portion is arranged on the N-pole moving contact, and a slide groove is also arranged on the upper end of the N-pole moving contact, the slide groove is connected by a first section groove and a second section groove of different heights to form a step-shaped slide groove, the first section groove is higher than the second section groove, the first section groove is located on the side of the N-pole moving contact away from the static contact, and the second section groove is located on the side of the N-pole moving contact close to the static contact, and the limiting portion is formed by the connection between the first section groove and the second section groove.

[0012] Furthermore, the slide groove is an open slide groove with an opening on one side, and the opening is provided on the side close to the static contact. The inner diameter of the slide groove is larger than the outer diameter of the sliding end so that the sliding end can slide relative to the slide groove.

[0013] Furthermore, one end of the first U-shaped rod is connected to the handle, and the other end is connected to the jump button. The L-pole moving contact is connected to the lever and coaxially installed on the shell. One end of the first drive spring is connected to the shell, and the other end is connected to the L-pole moving contact.

[0014] Furthermore, one end of the second drive spring is connected to the housing, and the other end is connected to the N-pole moving contact.

[0015] In the circuit breaker of the present invention, the L-pole contact mechanism and the N-pole contact mechanism are directly driven by the first U-shaped rod and the second U-shaped rod, respectively, and the closing times of the L-pole contact mechanism and the N-pole contact mechanism do not affect each other; the L-pole trip locking mechanism and the N-pole trip locking mechanism are respectively provided on the L-pole contact mechanism and the N-pole contact mechanism, and the pushing portion of the L-pole trip locking mechanism moves a preset distance in the opening direction to trigger the unlocking of the N-pole trip locking mechanism, so that the opening of the N-pole contact mechanism is later than the opening of the L-pole contact mechanism, and the opening time difference between the N-pole contact mechanism and the L-pole contact mechanism can be controlled by adjusting the preset distance.

[0016] In addition, in order to prevent the position of the handle from affecting the opening speed of the N-pole contact mechanism, a step-shaped slide groove is provided on the N-pole moving contact, and the connecting surface of the step is used as a limiting part to cooperate with the N-pole moving contact to ensure smooth closing of the N-pole moving contact; when opening, the height difference of the step structure is utilized, and the sliding end avoids the limiting part and slides under the rotation of the N-pole moving contact, which not only ensures the overall smooth operation of the operating mechanism, but also ensures the compactness of the operating mechanism; by arranging a pushing part for pushing the second U-shaped rod on the lever, and arranging a slide groove and a limiting part cooperating with the second U-shaped rod on the N-pole moving contact, the overall structure is compact, which is conducive to saving space in the shell and is suitable for the production of compact products. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the circuit breaker of the present invention when it is open;

[0018] Figure 2 It is a structural schematic diagram of the circuit breaker of the present invention when it is closed;

[0019] Figure 3 Schematic diagram of the structure of the N-pole moving contact of the circuit breaker of the present invention;

[0020] Figure 4 This is a schematic structural diagram of the circuit breaker of the present invention when the N-pole moving contact begins to close;

[0021] Figure 5 This is a structural diagram of the circuit breaker of the present invention when the N-pole moving contact is closed;

[0022] Figure 6 This is a schematic structural diagram of the circuit breaker of the present invention when the N-pole moving contact is open;

[0023] Figure 7 This is a schematic structural diagram of the circuit breaker of the present invention after the N-pole moving contact is opened;

[0024] Figure 8 It is a structural schematic diagram of the driving portion of the circuit breaker of the present invention;

[0025] Figure 9 It is a schematic diagram of the exploded structure of the L-pole contact mechanism and the N-pole contact mechanism of the circuit breaker of the present invention. DETAILED DESCRIPTION

[0026] The following is combined with Figures 1 to 8 The following examples are provided to further illustrate the specific implementation of the circuit breaker of the present invention. The circuit breaker of the present invention is not limited to the description of the following examples.

[0027] A circuit breaker includes a handle 1 rotatably mounted on a housing, an L-pole contact mechanism, and an N-pole contact mechanism. The L-pole contact mechanism and the N-pole contact mechanism are coaxially pivotally mounted within the housing. The L-pole contact mechanism and the N-pole contact mechanism are driven by the handle 1 to close with corresponding static contacts 6 via a first U-shaped rod 4 and a second U-shaped rod 5, respectively. The L-pole contact mechanism and the N-pole contact mechanism are driven to open via a first drive spring 2 and a second drive spring 3, respectively. The L-pole contact mechanism includes an L-pole trip locking mechanism, and the N-pole contact mechanism includes an N-pole trip locking mechanism. The L-pole contact mechanism is further provided with a pushing portion 71. When the circuit breaker trips, the L-pole trip locking mechanism is unlocked, and the L-pole contact mechanism is opened. The pushing portion 71 of the L-pole contact mechanism moves a preset distance in the opening direction, triggering the unlocking of the N-pole trip locking mechanism, and the N-pole contact mechanism is opened, so that the N-pole contact mechanism is opened later than the L-pole contact mechanism.

[0028] In the circuit breaker of the present invention, the L-pole contact mechanism and the N-pole contact mechanism are directly driven by the first U-shaped rod 4 and the second U-shaped rod 5, respectively, and the closing time of the L-pole contact mechanism and the N-pole contact mechanism do not affect each other; the L-pole trip locking mechanism and the N-pole trip locking mechanism are respectively provided on the L-pole contact mechanism and the N-pole contact mechanism. The pushing portion 71 of the L-pole trip locking mechanism moves a preset distance in the opening direction to trigger the unlocking of the N-pole trip locking mechanism, so that the opening of the N-pole contact mechanism is later than the opening of the L-pole contact mechanism. The opening time difference between the N-pole contact mechanism and the L-pole contact mechanism can be controlled by adjusting the preset distance.

[0029] like Figure 1-3As shown, the circuit breaker includes a handle 1 rotatably mounted on the housing, an L-pole contact mechanism and an N-pole contact mechanism, the L-pole contact mechanism and the N-pole contact mechanism are coaxially pivotally mounted in the housing, and the L-pole contact mechanism and the N-pole contact mechanism are driven by the handle 1 to close with the corresponding static contact 6 through the first U-shaped rod 4 and the second U-shaped rod 5 respectively. The handle 1 operates the L-pole contact mechanism to close through the first U-shaped rod 4, and the handle 1 operates the N-pole operating mechanism to close through the second U-shaped rod 5. Therefore, the closing times of the L-pole contact mechanism and the N-pole contact mechanism do not affect each other. The N-pole contact mechanism can be designed to close at the same time as the L-pole contact mechanism or at different times. Of course, the first U-shaped rod 4 and the second U-shaped rod 5 can be operated by one handle 1, or can be operated independently by two linked handles 1. The L-pole contact mechanism and the N-pole contact mechanism are driven to open by the first drive spring 2 and the second drive spring 3 respectively. The L-pole contact mechanism includes an L-pole trip locking mechanism, and the N-pole contact mechanism includes an N-pole trip locking mechanism. The L-pole contact mechanism includes a lever 7c and an L-pole moving contact 7 connected to the lever 7c. The pushing portion 71 is arranged on a side close to the N-pole contact mechanism, preferably on the lever 7c, and of course can also be arranged on the L-pole moving contact 7. When the circuit breaker trips, the L-pole trip locking mechanism is unlocked, causing the L-pole contact mechanism to open. The pushing portion 71 of the L-pole contact mechanism moves a preset distance in the opening direction and then triggers the N-pole trip locking mechanism to unlock, causing the N-pole contact mechanism to open. The N-pole contact mechanism opens later than the L-pole contact mechanism.

[0030] Specifically, the L-pole trip lock mechanism also includes a trip latch 7a and a lock latch 7b, which are pivotally mounted on a lever 7c. The lock latch 7b is preferably hinged to the lever 7c through an axial hole. The L-pole moving contact 7 is connected to the lever 7c and coaxially mounted on the housing. After closing the circuit breaker, the trip latch 7a and the lock latch 7b snap together and lock together with the lever 7c. During tripping, the trip latch 7a and the lock latch 7b unlock, separating the L-pole moving contact 7 from the static contact 6. The L-pole contact mechanism is connected to the handle 1 via a first U-shaped rod 4. Specifically, one end of the first U-shaped rod 4 is connected to the handle 1, and the other end is connected to the trip latch 7a. A first drive spring 2 is connected to the housing at one end and to the L-pole moving contact 7 at the other end.

[0031] The N-pole trip lock mechanism has the same structure as the L-pole trip lock mechanism, but due to the larger space it occupies, the present invention simplifies the design of the N-pole trip lock mechanism. The N-pole trip lock mechanism consists of the sliding end 51 of the second U-shaped rod 5 and the limit portion 82. The N-pole contact mechanism is connected to the handle 1 via the second U-shaped rod 5. One end of the second U-shaped rod 5 is connected to the handle 1, and the other end is connected to the N-pole contact mechanism. One end of the second drive spring 3 is connected to the housing, and the other end is connected to the N-pole moving contact 8. One end of the second U-shaped rod 5 connected to the N-pole contact mechanism serves as a sliding end 51. The N-pole trip locking mechanism includes a limiting portion 82 provided on the N-pole contact mechanism and a sliding end 51 provided on the second U-shaped rod 5. When closing the circuit, the handle 1 pushes the second U-shaped rod 5, and the sliding end 51 of the second U-shaped rod 5 abuts against the limiting portion 82 on the N-pole contact mechanism, and pushes the N-pole contact mechanism to close the circuit by pushing the limiting portion 82; after closing the circuit, the sliding end 51 maintains limiting cooperation with the limiting portion 82, and the N-pole trip locking mechanism is locked; when tripping, the pushing portion 71 on the L-pole contact mechanism pushes the sliding end 51 of the second U-shaped rod 5 to release the limiting cooperation with the limiting portion 82, and the N-pole trip locking mechanism is unlocked.

[0032] The pushing portion 71 is a protrusion extending from the L-pole contact mechanism toward the N-pole contact mechanism. The protrusion is wedge-shaped with a thin top and a thick bottom. The surface where the pushing portion 71 contacts the sliding end 51 is an inclined surface. In the process of the pushing portion 71 pushing the sliding end 51 to release the limiting engagement with the limiting portion 82, the pushing portion 71 provides a force for the sliding end 51 to separate upward from the limiting portion 82.

[0033] like Figure 8 As shown, the pushing portion 71 for pushing the sliding end 51 is preferably protruded and arranged on the side of the L-pole contact mechanism close to the N-pole contact mechanism, and a rotation spacing is left between the pushing portion 71 and the sliding end 51. The setting of the rotation spacing directly affects the contact between the pushing portion 71 between the L-pole moving contact 7 and the N-pole moving contact 8 and the sliding end 51 of the second U-shaped rod 5 during the rotation of the L-pole contact mechanism toward the static contact 6; by providing a pushing portion 71 for pushing the second U-shaped rod 5 on the lever 7c, a sliding groove 81 and a limiting portion 82 that cooperate with the second U-shaped rod 5 are provided on the N-pole moving contact 8, and a preset distance is left between the pushing portion 71 and the limiting portion 82. The length of the preset distance is related to the opening time difference of the L-pole moving contact 7 and the N-pole moving contact 8. Therefore, without affecting the opening distance of the N-pole contact mechanism, the opening time difference of the L-pole moving contact 7 and the N-pole moving contact 8 can be adjusted by controlling the rotation distance, so that the overall structure is compact, which is conducive to saving space in the shell and is suitable for the production of compact products.

[0034] Specifically, such as Figure 8 、 9As shown, the middle part of the lever 7c is provided with a connection hole for installation, preferably a waist-shaped hole as the connection hole. The middle and lower part of the lever 7c is connected to the L-pole moving contact 7. The side of the lever 7c close to the L-pole moving contact 7 is installed with a jump buckle 7a and a lock buckle 7b that cooperate and lock with each other. The jump buckle 7a and the lock buckle 7b are located in the space between the upper end of the L-pole moving contact 7 and the upper end of the lever 7c. The pushing portion 71 is located on the edge away from the static contact 6. It is preferably a protrusion formed by the edge of the lever 7c away from the static contact 6 extending toward the N-pole moving contact 8. The protrusion is wedge-shaped with a thin top and a thick bottom. The surface where the pushing portion 71 contacts the sliding end 51 is an inclined surface. In the process of pushing the sliding end 51 to release the limiting cooperation with the limiting portion 82, the pushing portion 71 provides the sliding end 51 with a force to disengage the limiting portion 82 upward. When a line fault such as a time-delay, instantaneous, or leakage fault occurs, the circuit breaker needs to open to protect the line. The time-delay, instantaneous, or leakage fault protection component triggers the rotation of latch 7b, disengaging trip latch 7a from latch 7b. Lever 7c and L-pole moving contact 7, acting under the action of first drive spring 2, rotate to the open position. During the opening process of L-pole moving contact 7, the push portion 71 of lever 7c pushes the extended sliding end 51 of the second U-shaped rod 5, separating the contact surface between the second U-shaped rod 5 and the stopper 82. This disengages the latch structure formed on the N-pole contact mechanism, allowing N-pole moving contact 8, acting under the action of second drive spring 3, to rotate to the open position. Therefore, N-pole contact 8 is triggered to open only a certain time after L-pole moving contact 7 opens. The time between the opening of the L-pole and N-pole contact mechanisms can be adjusted by adjusting the distance between the push portion 71 of lever 7c and the sliding end 51 of the second U-shaped rod 5.

[0035] like Figure 3-7 and Figure 9As shown, in order to prevent the position of the handle from affecting the opening speed of the N-pole contact mechanism, a slide groove 81 is provided on the N-pole moving contact, and the sliding end 51 of the second U-shaped rod 5 is slidably connected to the slide groove 81, and a limiting portion 82 for limiting the sliding of the second U-shaped rod 5 is provided on the slide groove 81; a slide groove 81 is provided on the N-pole contact mechanism, and when closing, the first U-shaped rod 4 drives the L-pole contact mechanism to rotate toward the static contact 6 under the operation of the handle 1; the sliding end 51 of the second U-shaped rod 5 contacts the limiting portion 82, and the second U-shaped rod 5 drives the N-pole contact mechanism to rotate toward the static contact 6 under the operation of the handle 1; when opening, the L-pole contact mechanism rotates toward away from the static contact 6 under the action of the first driving spring 2, and during the rotation process of the L-pole contact mechanism, the pushing portion 71 pushes the sliding end 51 of the second U-shaped rod 5 and the limiting portion of the slide groove 81. 82 is separated, and the N-pole contact mechanism rotates away from the static contact 6 under the drive of the second driving spring 3 and makes the sliding end 51 of the second U-shaped rod 5 slide with the slide groove 81. When opening, after the second U-shaped rod 5 is separated from the limit of the slide groove, relative to the shell, the second U-shaped rod 5 is basically motionless for a short time, only the N-pole moving contact is rotating, and the side of the slide groove 81 away from the static contact slides toward the sliding end 51 of the second U-shaped rod 5, and the sliding end 51 slides relative to the slide groove 81. Since the opening speed of the N-pole contact mechanism is faster and will reach the opening position before the handle 1, the slide groove 81 provides a sliding space for the sliding end 51 while the handle 1 has not reached the opening position. When the handle 1 returns to its position, the handle 1 drives the sliding end 51 of the second U-shaped rod 5 from the side of the slide groove 81 away from the static contact 6 to the side close to the static contact 6.

[0036] Preferred implementations include Figure 4-7 As shown, the chute 81 is preferably provided on the upper portion of the N-pole moving contact 8, thereby placing the second U-shaped rod 5 and the first U-shaped rod 4 at the same horizontal height, facilitating the simultaneous operation of the first U-shaped rod 4 and the second U-shaped rod 5 by the handle 1, so that the forces on the first U-shaped rod 4 and the second U-shaped rod 5 are balanced. A mounting hole for mounting on the housing is provided in the middle portion of the N-pole moving contact 8. The mounting hole is a long, waist-shaped hole that facilitates overtravel coordination between the moving and static contacts. A contact point is provided on the side of the lower end of the N-pole moving contact 8 close to the static contact 6, and a fan-shaped connecting portion 8a with a smaller bottom and a larger top is provided on the side of the upper end of the N-pole moving contact 8 away from the static contact 6. The chute 81 is provided on the fan-shaped connecting portion 8a. Of course, the fan-shaped connecting portion 8a can also be replaced by a connecting portion of other shapes.

[0037] The inner diameter of the slide groove 81 needs to be larger than the outer diameter of the sliding end 51 to ensure that the sliding end 51 will not be stuck when the two slide relative to each other; when the sliding end 51 slides relative to the slide groove 81, the sliding end 51 only contacts the lower part of the slide groove 81, and the upper part of the slide groove 81 is only used to enable the sliding end 51 to return to the initial position according to the defined trajectory after the switch is opened. The second section of the groove is provided with an opening at the end close to the static contact 6, and the bottom edge of the second section of the groove is the arc-shaped top of the N-pole moving contact 8 that bends downward; of course, the opening can also be omitted, and both ends of the slide groove 81 are closed.

[0038] The slide groove 81 is connected by a first groove section and a second groove section of different heights to form a step-shaped slide groove 81. The first groove section is higher than the second groove section. The first groove section is located on the side of the N-pole moving contact 8 away from the static contact 6, and the second groove section is located on the side of the N-pole moving contact 8 close to the static contact 6. The limiting portion 82 is formed by the connection between the first groove section and the second groove section. A gap is left between the upper part of the limiting portion 82 and the upper edge of the slide groove 81 for the sliding end 51 to pass through, which is beneficial for the sliding end 51 to avoid the limiting portion 82 and slide during the rotation of the N-pole moving contact 8; in order to ensure the limiting cooperation between the sliding end 51 and the limiting portion 82, it is preferred that the side wall of the limiting portion 82 in contact with the sliding end 51 is set to a concave surface. Of course, the side wall in contact with the sliding end 51 can also be a straight edge. The slide groove 81 can be a slide groove 81 with closed ends or an open slide groove 81 with one side open. Preferably, it is an open slide groove 81 with an opening on one side, and the opening is provided on the side close to the static contact 6. The inner diameter of the slide groove 81 is larger than the outer diameter of the sliding end 51 so that the sliding end 51 can slide relative to the slide groove 81 in the slide groove 81.

[0039] like Figure 4 、 5 As shown, when closing, the connecting surface of the stepped sliding groove 81 is used as the limiting portion 82 to cooperate with the N-pole moving contact 8 to limit the N-pole moving contact 8 so that the N-pole moving contact 8 can be closed smoothly. In addition, the arc-shaped bottom edge of the second groove section facilitates the sliding end 51 to slide toward the limiting portion 82. The sliding end 51 contacts the limiting portion 82, causing the N-pole moving contact 8 to rotate toward the static contact 6. Figure 6As shown, when the switch is opened, the sliding end 51 is separated from the limiting portion 82 under the action of the pushing portion 71. Relative to the housing, the sliding end 51 is basically motionless for a short period of time, and only the N-pole moving contact is rotating. By utilizing the height difference of the step structure, the N-pole moving contact 8 rotates so that the sliding end 51 avoids the limiting portion 82 and enters the higher first section of the groove and slides therein in a direction away from the static contact 6, which not only ensures the overall smooth operation of the operating mechanism, but also ensures the compactness of the operating mechanism. When tripping occurs, due to the fast speed of the N-pole moving contact 8, it reaches the opening position before the handle 1. The second U-shaped rod 5 cannot return to the initial position due to the action of the handle 1. Under the rotation of the N-pole contact 8, the sliding end 51 slides relative to the slide groove 81 and is in the first section of the slide groove 81; when the handle 1 returns to the initial position, it drives the second U-shaped rod 5 so that its sliding end 51 leaves the first section of the slide groove 81 and enters the second section of the groove, and finally as shown in FIG. Figure 7 shown.

[0040] The circuit breaker's opening is divided into two modes: manual and driven. Manual opening involves directly opening the L-pole and N-pole contact mechanisms via handle 1, allowing both to open simultaneously. Driven opening occurs when a fault current or a drive signal is present in the circuit, causing the L-pole and N-pole contact mechanisms to open, respectively, via drive springs. Opening, as described in the present invention, refers to the situation where the L-pole and N-pole contact mechanisms are driven by the first and second drive springs 2 and 3, respectively, when a fault occurs in the circuit.

[0041] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A circuit breaker, comprising a handle (1) rotatably mounted on a housing, an L-pole contact mechanism and an N-pole contact mechanism, wherein the L-pole contact mechanism and the N-pole contact mechanism are coaxially pivotally mounted in the housing, wherein the L-pole contact mechanism and the N-pole contact mechanism are driven by the handle (1) to close the circuit with corresponding static contacts (6) via a first U-shaped rod (4) and a second U-shaped rod (5), respectively, and the L-pole contact mechanism and the N-pole contact mechanism are driven to open the circuit via a first drive spring (2) and a second drive spring (3), respectively, wherein: The L-pole contact mechanism includes an L-pole trip locking mechanism, and the N-pole contact mechanism includes an N-pole trip locking mechanism. The L-pole contact mechanism is further provided with a pushing portion (71). When the circuit breaker trips, the L-pole trip locking mechanism is unlocked, and the L-pole contact mechanism is opened. The pushing portion (71) of the L-pole contact mechanism moves a preset distance in the opening direction, triggering the unlocking of the N-pole trip locking mechanism, and the N-pole contact mechanism is opened. The N-pole contact mechanism is opened later than the L-pole contact mechanism. The N-pole trip locking mechanism comprises a limiting portion (82) provided on the N-pole contact mechanism and a sliding end (51) provided on the second U-shaped rod (5); when closing the switch, the handle (1) pushes the second U-shaped rod (5), the sliding end (51) of the second U-shaped rod (5) abuts against the limiting portion (82) on the N-pole contact mechanism, and pushes the limiting portion (82) to push the N-pole contact mechanism to close the switch; after closing the switch, the sliding end (51) and the limiting portion (82) maintain limiting engagement, and the N-pole trip locking mechanism is locked; when tripping, the pushing portion (71) on the L-pole contact mechanism pushes the sliding end (51) of the second U-shaped rod (5) and the limiting portion (82) to release limiting engagement, and the N-pole trip locking mechanism is unlocked.

2. The circuit breaker according to claim 1, wherein: The L-pole contact mechanism comprises a lever (7c) and an L-pole movable contact (7); the lever (7c) is connected to the L-pole movable contact (7); and the pushing portion (71) is arranged on a side of the lever (7c) close to the N-pole contact mechanism.

3. The circuit breaker according to claim 2, wherein: The L-pole trip locking mechanism further comprises a trip buckle (7a) and a lock buckle (7b), wherein the trip buckle (7a) and the lock buckle (7b) are pivotally arranged on a lever (7c); after closing the circuit, the trip buckle (7a) and the lock buckle (7b) are snapped together and locked with the lever (7c) as a whole; when tripping, the trip buckle (7a) and the lock buckle (7b) are unlocked, and the L-pole moving contact (7) and the static contact (6) are separated.

4. The circuit breaker according to any one of claims 1 to 3, characterized in that: One end of the second U-shaped rod (5) is connected to the handle (1), and the other end is connected to the N-pole contact mechanism. The end of the second U-shaped rod (5) connected to the N-pole contact mechanism serves as a sliding end (51).

5. The circuit breaker according to claim 4, characterized in that The pushing portion (71) is a protrusion formed on the L-pole contact mechanism and extending in the direction of the N-pole contact mechanism. The protrusion is wedge-shaped with a thin top and a thick bottom. The surface where the pushing portion (71) contacts the sliding end (51) is an inclined surface.

6. The circuit breaker according to claim 4, characterized in that The N-pole contact mechanism includes an N-pole movable contact (8), the limiting portion (82) is arranged on the N-pole movable contact (8), and a slide groove (81) is further arranged on the upper end of the N-pole movable contact (8), the slide groove (81) is formed by connecting a first section groove and a second section groove of different heights to form a step-shaped slide groove (81), the first section groove is higher than the second section groove, the first section groove is located on the side of the N-pole movable contact (8) away from the static contact (6), and the second section groove is located on the side of the N-pole movable contact (8) close to the static contact (6), and the limiting portion (82) is formed by the connection between the first section groove and the second section groove.

7. The circuit breaker according to claim 6, characterized in that The slide groove (81) is an open slide groove (81) with an opening on one side, and the opening is provided on the side close to the static contact (6). The inner diameter of the slide groove (81) is larger than the outer diameter of the sliding end (51) so that the sliding end (51) can slide relative to the slide groove (81) in the slide groove (81).

8. The circuit breaker according to claim 3, wherein: One end of the first U-shaped rod (4) is connected to the handle (1), and the other end is connected to the trip button (7a); the L-pole moving contact (7) is connected to the lever (7c) and is coaxially mounted on the housing; one end of the first drive spring (2) is connected to the housing, and the other end is connected to the L-pole moving contact (7).

9. The circuit breaker according to claim 6, wherein: One end of the second driving spring (3) is connected to the housing, and the other end is connected to the N-pole moving contact (8).

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