Circuit breaker

Abstract

The circuit breaker comprises a circuit breaker shell, an operation knob and an electric operation mechanism, the electric operation mechanism comprises a transmission gear, a driving gear and a driving device, and when the circuit breaker is in an opening state, the driving gear can be driven by the driving device to drive the transmission gear to rotate forwards together. Or the transmission gear can be driven by the operation gear to independently rotate forwards to the switching-on position and then starts to be in contact with the driving gear, or a first rotating gap is formed between the transmission gear and the driving gear; when the circuit breaker is in a closed state, the driving gear can be driven by the driving device to drive the transmission gear to rotate reversely together, or the transmission gear can be driven by the operation gear to independently rotate reversely to an opening position and then starts to be in contact with the driving gear, or a second rotating gap exists between the transmission gear and the driving gear. The utility model relates to the field of low-voltage electric appliances, in particular to a circuit breaker, which is characterized in that an operation gear is arranged on an operation knob, and an electric operation mechanism matched with the operation gear is added, so that electric opening and closing operation and manual opening and closing operation can be realized.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a circuit breaker. Background Art

[0002] If a rotary circuit breaker is located far from personnel and the system detects that the circuit breaker has tripped due to a controllable fault, remote closing of the circuit breaker after the fault is resolved requires an electric operating device. Furthermore, in some situations, manual operation is also required in addition to electric operation. Conventional rotary circuit breakers suffer from interference between electric and manual operation. Utility Model Content

[0003] The purpose of the present utility model is to overcome at least one defect of the prior art and provide a circuit breaker.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The circuit breaker comprises a circuit breaker housing, an operating knob rotatably mounted on the circuit breaker housing and used for manual opening and closing, and an electric operating mechanism for electric opening and closing, wherein the electric operating mechanism comprises a transmission gear, a drive gear and a drive device.

[0006] The transmission gear can be switched between the opening position and the closing position by forward or reverse rotation angle d. The transmission gear is meshed with the operating gear. The operating gear is mounted on the operating knob of the circuit breaker and rotates synchronously with the operating knob. The driving device is drivingly connected to the driving gear, and the driving gear is drivingly matched with the transmission gear.

[0007] When the circuit breaker is in the open state, the driving gear is in the initial position and the transmission gear is in the open position. The driving gear can be driven by the driving device to drive the transmission gear to rotate forward by an angle d to the closed position, or the transmission gear can be driven by the operating gear to rotate forward by an angle d to the closed position and then come into contact with the driving gear or have a first rotational gap between the transmission gear and the driving gear.

[0008] When the circuit breaker is in the closed state, the driving gear is in the initial position and the transmission gear is in the closed position. The driving gear can drive the transmission gear to reverse by an angle d to the open position under the drive of the driving device, or the transmission gear can reverse by an angle d alone under the drive of the operating gear to the open position and then start to contact the driving gear or have a second rotational gap between the transmission gear and the driving gear.

[0009] Optionally, when the circuit breaker is electrically closed, the drive device first drives the drive gear to rotate forward from the initial position to the first position, so that the drive gear drives the transmission gear to rotate forward from the open position to the closed position. After the circuit breaker is closed, the drive device then drives the drive gear to rotate reversely from the first position to reset to the initial position.

[0010] When the circuit breaker is electrically opened, the drive device first drives the drive gear to reverse and switch from the initial position to the second position, so that the drive gear drives the transmission gear to reverse and switch from the closed position to the open position. After the circuit breaker is opened, the drive device drives the drive gear to rotate forward and return from the second position to the initial position.

[0011] Optionally, the angle of the first rotation gap is greater than the angle of the second rotation gap; when the driving gear is in the initial position and the transmission gear is in the closed position, the driving gear can reverse alone by an angle c under the drive of the driving device before contacting the transmission gear, driving the transmission gear to reverse together.

[0012] Optionally, the transmission gear is provided with a closing actuated portion and an opening actuated portion, the drive gear is provided with a driving block, the driving block rotation limit is located between the closing actuated portion and the opening actuated portion, and the driving block has a closing driving surface drivingly matched with the closing actuated portion and an opening driving surface drivingly matched with the opening actuated portion;

[0013] When the circuit breaker is in the open state, the drive gear is in the initial position and the transmission gear is in the open position, the closing drive surface and the closing actuated part are in contact with or spaced apart from each other, and the angle between the opening drive surface and the opening actuated part is angle a, which is greater than or equal to angle d;

[0014] When the circuit breaker is in the closed state, the drive gear is in the initial position and the transmission gear is in the closed position, the angle between the closing drive surface and the closing actuated part is angle b, and the angle between the opening drive surface and the opening actuated part is angle c, and angle b is greater than or equal to angle d.

[0015] Optionally, the transmission gear and the driving gear are stacked and spaced apart, and an actuated groove is provided on the side of the transmission gear facing the driving gear, and the opposite side walls of the actuated groove are the closing actuated part and the opening actuated part, and the driving block is provided on the side of the driving gear facing the transmission gear.

[0016] Optionally, the actuated groove is a fan ring groove, and the actuated groove has two straight side walls, which are respectively used as the closing actuated part and the opening actuated part; the driving block is a fan ring block, and the driving block has two side planes, which are respectively used as the closing driving surface and the opening driving surface.

[0017] Optionally, the electric operating mechanism also includes a mechanism housing, the transmission gear, drive gear and drive device are installed in the mechanism housing, the contour edge of the transmission gear is provided with a first tooth portion, the mechanism housing is provided with a through-hole corresponding to the first tooth portion, and the mechanism housing is installed on one side of the circuit breaker housing along the axial direction of the transmission gear; the operating knob is rotatably installed on the top surface of the circuit breaker housing, the contour edge of the operating gear is provided with a second tooth portion, and the second tooth portion passes through the through-hole and is meshed with the first tooth portion.

[0018] Optionally, the transmission gear and the operating gear are both bevel gears, and the rotation axis of the transmission gear and the rotation axis of the operating gear are perpendicular to each other.

[0019] Optionally, the transmission gear includes a sector-shaped portion stacked and spaced apart from the driving gear and a protruding portion protruding from the driving gear, the sector-shaped portion is coaxial with the driving gear and rotates asynchronously, and the first tooth portion is arranged on the contour edge of the protruding portion.

[0020] Optionally, the driving device is connected to the driving gear through at least one gear set, and the gear set includes a large gear and a small gear that are coaxial and rotate synchronously. The large gear of the gear set located at the front end of the transmission is meshed with the driving shaft of the driving device, and the small gear of the gear set located at the end of the transmission is meshed with the driving gear. The large gear of one gear set in the two adjacent gear sets is meshed with the small gear of the other gear set.

[0021] The circuit breaker of the utility model is provided with an operating gear on the operating knob, and an electric operating mechanism cooperating with the operating gear is added. Without changing the internal structure of the circuit breaker, electric opening and closing operations can be reliably realized, and manual opening and closing operations are not hindered.

[0022] In addition, the setting of angle c prevents the driving gear from accidentally touching the transmission gear due to an error when returning from the first position to the initial position, thereby preventing the circuit breaker from tripping accidentally. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an assembly drawing of the circuit breaker and the electric operating mechanism of the utility model;

[0024] Figure 2 This is an exploded view of the circuit breaker and the electric operating mechanism of the utility model;

[0025] Figure 3 This is a front view of the electric operating mechanism of the utility model circuit breaker in the open state;

[0026] Figure 4 This is a partial cross-sectional view of the electric operating mechanism of the utility model circuit breaker in the open state;

[0027] Figure 5 It is a front view of the electric operating mechanism of the utility model when the driving gear is in the first position and the transmission gear is in the closed position;

[0028] Figure 6 It is a partial cross-sectional view of the electric operating mechanism of the utility model when the driving gear is in the first position and the transmission gear is in the closing position;

[0029] Figure 7 This is a front view of the electric operating mechanism of the utility model circuit breaker in the closed state;

[0030] Figure 8 It is a partial cross-sectional view of the electric operating mechanism of the utility model circuit breaker in the closed state;

[0031] Figure 9 This is a front view of the electric operating mechanism of the utility model when the driving gear is in the second position and the transmission gear is in the open position;

[0032] Figure 10 It is a partial cross-sectional view of the electric operating mechanism of the utility model when the driving gear is in the second position and the transmission gear is in the open position;

[0033] Figure 11 This is a front view of the drive gear of the utility model;

[0034] Figure 12 It is a three-dimensional diagram of the driving gear of the utility model;

[0035] Figure 13 It is a structural diagram of the transmission gear of the utility model.

[0036] Mechanism housing 1; perforation 11; drive device 2; gear set 3; large gear 31; small gear 32; drive gear 4; drive block 41; closing drive surface 411; opening drive surface 412; transmission gear 5; actuated groove 51; closing actuated portion 52; opening actuated portion 53; first tooth portion 54; sector portion 55; protruding portion 56; arc-shaped rib 57; operating gear 6; second tooth portion 61; operating knob 7; circuit breaker housing 8. DETAILED DESCRIPTION

[0037] The following embodiments are given in conjunction with the accompanying drawings 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 embodiments.

[0038] like Figure 1 and Figure 2As shown, the circuit breaker of this embodiment is a rotary circuit breaker, comprising a circuit breaker housing 8, an operating knob 7 rotatably mounted on the circuit breaker housing 8 and used for manual opening and closing, and an electric operating mechanism for electric opening and closing. It should be noted that the manual opening and closing technology of the circuit breaker of this embodiment is prior art. A circuit breaker generally comprises an operating mechanism and a contact mechanism. Rotating the operating knob 7 causes the operating mechanism to connect or disconnect the movable contact of the contact mechanism with the static contact, thereby achieving opening and closing of the circuit breaker. A circuit breaker generally also comprises a protection mechanism. In the event of a fault such as a short circuit or overload, the protection mechanism trips the operating mechanism and drives the movable contact of the contact mechanism to disconnect from the static contact, thereby tripping and opening the circuit breaker to protect the main circuit of the circuit breaker.

[0039] like Figures 1-4 As shown, the electric operating mechanism of this embodiment includes a transmission gear 5, a drive gear 4 and a drive device 2. The transmission gear 5 rotates forward or reversely by an angle d (not shown in the figure) to switch between the open position and the closed position. The transmission gear 5 is meshed with the operating gear 6. The operating gear 6 is mounted on the operating knob 7 of the circuit breaker and rotates synchronously with the operating knob 7. The drive device 2 is driven by the drive gear 4, and the drive gear 4 is driven by the transmission gear 5.

[0040] The driving gear 4 and the transmission gear 5 do not rotate synchronously. When the transmission gear 5 is manually driven by the operating gear 6 to rotate between the closing position and the opening position, it will not be limited by the driving gear 4.

[0041] like Figure 3 and Figure 4 As shown, the circuit breaker is in the open state, the driving gear 4 is in the initial position and the transmission gear 5 is in the open position, and the transmission gear 5 can rotate forward by an angle d to the closed position. At this time, there is a gap between the transmission gear 5 and the driving gear 4 in the forward direction. The driving gear 4 can drive the transmission gear 5 to rotate forward (counterclockwise in the figure) by an angle d to the closed position under the drive of the driving device 2; or the transmission gear 5 can be driven by the operating gear 6 to rotate forward by an angle d to the closed position and then start to contact the drive gear 4 or have a first rotation gap between the transmission gear 5 and the drive gear 4, that is, when the drive gear 4 remains stationary, the transmission gear 5 can be driven by the operating gear 6 to rotate forward alone to realize manual closing of the circuit breaker; Figure 7 and Figure 8As shown, the circuit breaker is in the closed state, the drive gear 4 is in the initial position and the transmission gear 5 is in the closed position. The transmission gear 5 can reverse by an angle d to the open position. At this time, there is a gap between the transmission gear 5 and the drive gear 4 in the reverse direction. The drive gear 4 can drive the transmission gear 5 to reverse together (rotate clockwise in the figure) by an angle d to the open position under the drive of the drive device 2, or the transmission gear 5 can be driven by the operating gear 6 to reverse by an angle d to the open position and then begin to contact the drive gear 4 or have a second rotational gap between the transmission gear 5 and the drive gear 4. That is, when the drive gear 4 remains stationary, the transmission gear 5 can be driven by the operating gear 6 to reverse alone to achieve manual opening of the circuit breaker. The circuit breaker of this embodiment is provided with an operating gear 6 on the operating knob 7, and an electric operating mechanism is added to cooperate with the operating gear 6. Without changing the internal structure of the circuit breaker, it can reliably achieve electric opening and closing operations while not hindering manual opening and closing operations.

[0042] In the electric opening and closing process of the circuit breaker of this embodiment, when the circuit breaker is electrically closed, the driving device 2 first drives the driving gear 4 to rotate forward from the initial position to the first position, so that the driving gear 4 drives the transmission gear 5 to rotate forward from the opening position to the closing position. Figure 5 and Figure 6 As shown, after the circuit breaker is closed, the driving device 2 receives the closing completion signal and then drives the driving gear 4 to reverse and reset from the first position to the initial position, avoiding the transmission gear 5, so that the transmission gear 5 can be manually driven by the operating gear 6 to perform the opening operation, as shown in FIG. Figure 7 and Figure 8 As shown;

[0043] When the circuit breaker is electrically opened, the driving device 2 first drives the driving gear 4 to reverse and switch from the initial position to the second position, so that the driving gear 4 drives the transmission gear 5 to reverse and switch from the closing position to the opening position. Figure 9 and Figure 10 As shown, after the circuit breaker is opened, the driving device 2 receives the opening completion signal and then drives the driving gear 4 to rotate forward from the second position to the initial position, avoiding the transmission gear 5, so that the transmission gear 5 can be manually driven by the operating gear 6 to perform the closing operation, as shown in FIG. Figure 3 and Figure 4 The drive device 2 of this embodiment is a motor, which is controlled by a control system. The control technology of the control system is achievable in the prior art. The control system can receive the status signal of the circuit breaker and output a control signal to the drive device 2 to control the start, stop, forward rotation and reverse rotation of the drive device 2. The details will not be repeated here.

[0044] like Figure 4 and Figure 8 As shown, the angle of the first rotation gap is greater than the angle of the second rotation gap; Figure 8As shown, when the circuit breaker is in the closed state (i.e., when the drive gear 4 is in the initial position and the transmission gear 5 is in the closed position), the drive gear 4, driven by the drive device 2, can independently rotate through angle c before contacting the transmission gear 5, driving the transmission gear 5 to rotate together. Angle c is the difference between the first rotational gap and the second rotational gap. This angle c prevents the drive gear 4 from accidentally contacting the transmission gear 5 due to error when returning from the first position to the initial position, potentially causing the circuit breaker to trip.

[0045] like Figure 4 、 Figure 6 、 Figure 8 and Figure 10 As shown, the drive matching structure between the drive gear 4 and the transmission gear 5 of this embodiment, the transmission gear 5 is provided with a closing actuated part 52 and an opening actuated part 53, the drive gear 4 is provided with a driving block 41, the rotation limit of the driving block 41 is located between the closing actuated part 52 and the opening actuated part 53, and the driving block 41 has a closing driving surface 411 drivingly matched with the closing actuated part 52 and an opening driving surface 412 drivingly matched with the opening actuated part 53.

[0046] like Figure 4 As shown, when the circuit breaker is in the open state, the drive gear 4 is in the initial position and the transmission gear 5 is in the open position, the closing drive surface 411 is in contact with or spaced from the closing actuated portion 52, and the angle between the opening drive surface 412 and the opening actuated portion 53 is angle a, which is greater than or equal to angle d. If the angle a is equal to the angle d, when the driving gear 4 is in the initial position and the transmission gear 5 is in the opening position, the transmission gear 5 is driven by the operating gear 6 to rotate forward by the angle d (i.e., manual closing is completed) and then the opening driving surface 412 starts to contact the opening actuated part 53, that is, electric opening is performed at this time, and the driving gear 4 drives the transmission gear 5 to reverse together; if the angle a is greater than the angle d, when the driving gear 4 is in the initial position and the transmission gear 5 is in the opening position, when the driving gear 4 is in the initial position and the transmission gear 5 is in the opening position, after the transmission gear 5 is driven by the operating gear 6 to rotate forward by the angle d (i.e., manual closing is completed), there is a first rotational gap between the opening driving surface 412 and the opening actuated part 53, and the angle of the first rotational gap is the difference between the angle a and the angle d, that is, electric opening is performed at this time, and the driving gear 4 first reverses the angle of the first rotational gap and then drives the transmission gear 5 to reverse together.

[0047] like Figure 8As shown, when the circuit breaker is in the closed state, the drive gear 4 is in the initial position and the transmission gear 5 is in the closed position, the angle between the closing drive surface 411 and the closing actuated portion 52 is angle b, and the angle between the opening drive surface 412 and the opening actuated portion 53 is angle c, and the angle b is greater than or equal to angle d. If the angle b is equal to the angle d, when the drive gear 4 is in the initial position and the transmission gear 5 is in the closing position, the transmission gear 5 is driven by the operating gear 6 to reverse the angle d alone (i.e., manual opening is completed), and then the closing drive surface 411 starts to contact the closing actuated part 52, that is, electric closing is performed at this time, and the drive gear 4 drives the transmission gear 5 to rotate forward together; if the angle b is greater than the angle d, when the drive gear 4 is in the initial position and the transmission gear 5 is in the closing position, the transmission gear 5 is driven by the operating gear 6 to reverse the angle d alone (i.e., manual opening is completed), and there is a second rotation gap between the closing drive surface 411 and the closing actuated part 52, and the angle of the second rotation gap is the difference between the angle b and the angle d, that is, electric closing is performed at this time, and the drive gear 4 first rotates forward alone by the angle of the second rotation gap and then drives the transmission gear 5 to rotate forward together.

[0048] During electric closing, as the drive gear 4 drives the transmission gear 5 to rotate toward the closed position, the closing drive surface 411 of the drive gear 4 abuts the closing actuated portion 52 of the transmission gear 5. During electric opening, as the drive gear 4 drives the transmission gear 5 to rotate toward the open position, the opening drive surface 412 of the drive gear 4 abuts the opening actuated portion 53 of the transmission gear 5. The drive structure between the drive gear 4 and the transmission gear 5 of this embodiment is simple, and the abutting drive method ensures reliable and stable drive.

[0049] Further, such as Figures 9-13 As shown, the transmission gear 5 and the drive gear 4 are stacked and spaced apart. An actuated groove 51 is provided on the side of the transmission gear 5 facing the drive gear 4. The opposite side walls of the actuated groove 51 serve as the closing actuated portion 52 and the opening actuated portion 53. The driving block 41 is provided on the side of the drive gear 4 facing the transmission gear 5. Preferably, the actuated groove 51 is a sector ring groove having two straight sidewalls, which serve as the closing actuated portion 52 and the opening actuated portion 53, respectively. The driving block 41 is a sector ring block having two side planes, which serve as the closing actuated portion 411 and the opening actuated portion 412, respectively.

[0050] like Figure 3As shown, the drive structure between the drive device 2 and the drive gear 4 of this embodiment is connected to the drive gear 4 through at least one gear set 3. The gear set 3 includes a large gear 31 and a small gear 32 that are coaxial and rotate synchronously. The large gear 31 of the gear set 3 located at the transmission head end is meshed with the drive shaft of the drive device 2, and the small gear 32 of the gear set 3 located at the transmission end is meshed with the drive gear 4. The large gear 31 of one gear set 3 of two adjacent gear sets 3 is meshed with the small gear 32 of the other gear set 3. The drive is reliable and stable, and the layout is compact, which is conducive to the miniaturization design of the electric operating mechanism. Obviously, one or more gears can be set between the drive device 2 and the drive gear 4 for transmission.

[0051] like Figure 1 and Figure 2 、 13 As shown, the electric operating mechanism of this embodiment also includes a mechanism housing 1. The transmission gear 5, drive gear 4, gear set 3, and drive device 2 are installed in the mechanism housing 1. The outline edge of the transmission gear 5 is provided with a first tooth portion 54. The mechanism housing 1 is provided with a through hole 11 corresponding to the first tooth portion 54. The mechanism housing 1 is installed on one side of the circuit breaker housing 8 along the axial direction of the transmission gear 5. The mechanism housing 1 is composed of two half shells covering each other. The circuit breaker housing 8 is composed of a base, a pedestal, and a cover that are stacked and fixed. The operating knob 7 is rotatably mounted on the top surface of the circuit breaker housing 8. The outline edge of the operating gear 6 is provided with a second tooth portion 61. The second tooth portion 61 passes through the through hole 11 and meshes with the first tooth portion 54. The layout structure between the circuit breaker and the electric operating mechanism is simple and compact, reducing the occupied space. Preferably, the transmission gear 5 and the operating gear 6 are both bevel gears, and the rotation axis of the transmission gear 5 is perpendicular to the rotation axis of the operating gear 6, that is, the rotation axis of the transmission gear 5 is also perpendicular to the rotation axis of the operating knob 7. The operating gear 6 radially occupies the space in the width direction of the circuit breaker, so that the gears of the electric operating mechanism (including the transmission gear 5, the drive gear 4 and the gear set 3) can be designed to occupy the space in the height direction of the mechanism housing 1 (that is, the height direction of the circuit breaker) in the radial direction, making the structure more compact and reasonable.

[0052] like Figure 13 As shown, the transmission gear 5 is a special-shaped bevel gear, including a sector-shaped portion 55 stacked and spaced apart with the driving gear 4 and a protruding portion 56 protruding from the driving gear 4. The sector-shaped portion 55 is coaxial with the driving gear 4 and rotates asynchronously. The driven groove 51 is provided on the sector-shaped portion 55, and the first tooth portion 54 is provided on the contour edge of the protruding portion 56. The side of the protruding portion 56 facing the driving gear 4 is provided with an arc-shaped rib 57 spaced apart from the contour edge of the driving gear 4.

[0053] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, or are conventionally placed directions or positional relationships during use. They are intended solely for ease of description and do not imply that the devices or components referred to must have a specific direction. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and description and should not be construed as indicating relative importance.

[0054] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot 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 circuit breaker housing (8), an operating knob (7) rotatably mounted on the circuit breaker housing (8) and used for manual opening and closing, and an electric operating mechanism for electric opening and closing, the electric operating mechanism comprising a transmission gear (5), a drive gear (4) and a drive device (2), Its characteristics are: The transmission gear (5) can be switched between the opening position and the closing position by forward or reverse rotation angle d, the transmission gear (5) is meshedly connected with the operating gear (6), the operating gear (6) is mounted on the operating knob (7) of the circuit breaker and rotates synchronously with the operating knob (7), the driving device (2) is drivingly connected with the driving gear (4), and the driving gear (4) is drivingly matched with the transmission gear (5). When the circuit breaker is in an open state, the driving gear (4) is located at an initial position and the transmission gear (5) is located at an open position. The driving gear (4) can drive the transmission gear (5) to rotate forward by an angle d to a closed position under the drive of the driving device (2), or the transmission gear (5) can rotate forward by an angle d alone under the drive of the operating gear (6) to a closed position and then come into contact with the driving gear (4) or have a first rotation gap with the driving gear (4). When the circuit breaker is in a closed state, the driving gear (4) is located at an initial position and the transmission gear (5) is located at a closed position. The driving gear (4) can drive the transmission gear (5) to reverse by an angle d to an opening position under the drive of the driving device (2), or the transmission gear (5) can reverse by an angle d to an opening position under the drive of the operating gear (6) and then come into contact with the driving gear (4) or have a second rotation gap with the driving gear (4).

2. The circuit breaker according to claim 1, wherein: When the circuit breaker is electrically closed, the drive device (2) first drives the drive gear (4) to rotate forward from the initial position to the first position, so that the drive gear (4) drives the transmission gear (5) to rotate forward from the opening position to the closing position. After the circuit breaker is closed, the drive device (2) then drives the drive gear (4) to rotate backward from the first position to reset to the initial position. When the circuit breaker is electrically opened, the drive device (2) first drives the drive gear (4) to reverse and switch from the initial position to the second position, so that the drive gear (4) drives the transmission gear (5) to reverse and switch from the closing position to the opening position. After the circuit breaker is opened, the drive device (2) then drives the drive gear (4) to rotate forward and return from the second position to the initial position.

3. The circuit breaker according to claim 1, wherein: The angle of the first rotational gap is greater than the angle of the second rotational gap; when the driving gear (4) is in the initial position and the transmission gear (5) is in the closed position, the driving gear (4) can be driven by the driving device (2) to reverse by an angle c before contacting the transmission gear (5), thereby driving the transmission gear (5) to reverse together.

4. The circuit breaker according to any one of claims 1 to 3, characterized in that: The transmission gear (5) is provided with a closing actuated portion (52) and an opening actuated portion (53); the driving gear (4) is provided with a driving block (41); the driving block (41) is rotationally limited between the closing actuated portion (52) and the opening actuated portion (53); and the driving block (41) has a closing driving surface (411) drivingly matched with the closing actuated portion (52) and an opening driving surface (412) drivingly matched with the opening actuated portion (53); When the circuit breaker is in an open state, the driving gear (4) is located at the initial position and the transmission gear (5) is located at the open position, the closing driving surface (411) and the closing actuated portion (52) are in contact with or spaced apart from each other, and the angle between the opening driving surface (412) and the opening actuated portion (53) is angle a, which is greater than or equal to angle d; When the circuit breaker is in a closed state, the drive gear (4) is located at an initial position and the transmission gear (5) is located at a closed position, the angle between the closing drive surface (411) and the closing actuated portion (52) is angle b, the angle between the opening drive surface (412) and the opening actuated portion (53) is angle c, and angle b is greater than or equal to angle d.

5. The circuit breaker according to claim 4, characterized in that: The transmission gear (5) and the drive gear (4) are stacked and spaced apart. An actuated groove (51) is provided on the side of the transmission gear (5) facing the drive gear (4). The opposite side walls of the actuated groove (51) are the closing actuated portion (52) and the opening actuated portion (53). The drive block (41) is provided on the side of the drive gear (4) facing the transmission gear (5).

6. The circuit breaker according to claim 5, characterized in that: The actuated groove (51) is a fan ring groove, and the actuated groove (51) has two straight side walls, which are respectively used as the closing actuated portion (52) and the opening actuated portion (53); the driving block (41) is a fan ring block, and the driving block (41) has two side planes, which are respectively used as the closing driving surface (411) and the opening driving surface (412).

7. The circuit breaker according to claim 1, wherein: The electric operating mechanism further comprises a mechanism housing (1), the transmission gear (5), the drive gear (4) and the drive device (2) are installed in the mechanism housing (1), the contour edge of the transmission gear (5) is provided with a first tooth portion (54), the mechanism housing (1) is provided with a through hole (11) corresponding to the first tooth portion (54), and the mechanism housing (1) is installed on one side of the circuit breaker housing (8) along the axial direction of the transmission gear (5); the operating knob (7) is rotatably installed on the top surface of the circuit breaker housing (8), the contour edge of the operating gear (6) is provided with a second tooth portion (61), and the second tooth portion (61) passes through the through hole (11) and is meshed with the first tooth portion (54).

8. The circuit breaker according to claim 7, wherein: The transmission gear (5) and the operating gear (6) are both bevel gears, and the rotation axis of the transmission gear (5) and the rotation axis of the operating gear (6) are perpendicular to each other.

9. The circuit breaker according to claim 7, wherein: The transmission gear (5) comprises a sector-shaped portion (55) stacked and spaced apart from the driving gear (4) and a protruding portion (56) protruding from the driving gear (4); the sector-shaped portion (55) is coaxial with the driving gear (4) and rotates asynchronously; the first tooth portion (54) is arranged on the contour edge of the protruding portion (56).

10. The circuit breaker according to claim 1, wherein: The driving device (2) is connected to the driving gear (4) through at least one gear set (3). The gear set (3) comprises a large gear (31) and a small gear (32) which are coaxial and synchronously rotated. The large gear (31) of the gear set (3) at the transmission head end is meshed with the driving shaft of the driving device (2). The small gear (32) of the gear set (3) at the transmission end end is meshed with the driving gear (4). The large gear (31) of one gear set (3) of two adjacent gear sets (3) is meshed with the small gear (32) of the other gear set (3).

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