Manual operation mechanism of circuit breaker, and circuit breaker

Abstract

A manual operation mechanism of a circuit breaker, and a circuit breaker. The manual operation mechanism of the circuit breaker comprises an external rotary handle (1), a transmission mechanism (2), a linkage arm (3) and a rocker arm (4), wherein the external rotary handle (1) is rotatably provided outside a housing (100) of the circuit breaker around a first rotating center; the linkage arm (3) is rotatably provided inside the housing (100) around a second rotating center, and the linkage arm (3) is connected to the external rotary handle (1) by means of the transmission mechanism (2); one end of the rocker arm (4) is rotatably arranged inside the housing (100) around a third rotating center, and the other end of the rocker arm (4) is slidably connected to the linkage arm (3); and the three rotating centers dop not coincide with one another.

Description

[0001] This application claims priority to Chinese Patent Application No. 202310734993.4 filed with the China National Intellectual Property Administration (CNIPA) on Jun. 20, 2023, the disclosure of which is incorporated herein by reference in its entirety.TECHNICAL FIELD

[0002] This application relates to the technical field of low-voltage electrical appliances, for example, to a manual operation mechanism of a circuit breaker and a circuit breaker.BACKGROUND

[0003] As shown in FIG. 1 and FIG. 2, a manual operation mechanism of a circuit breaker includes an external screwing handle 20 disposed outside a housing 10 and a linkage portion disposed inside the housing 10. The outer wall of the housing 10 is marked with a closing region 101, a tripping region 102, and an opening region 103. An indicating end of the external screwing handle 20 rotates among these three regions to indicate the closing, tripping, and opening states of the circuit breaker. The linkage portion includes a rocker arm 30 and a linkage arm 40. One end of the linkage arm 40 is rotatably connected to the housing 10, and is fixedly connected to the external screwing handle 20 so that the linkage arm 40 and the external screwing handle 20 rotate synchronously. The rotation center of the linkage arm 40 is located at the center of the housing 10. One end of the rocker arm 30 is rotatably connected to the housing 10, and the rotation center of the rocker arm 30 is located at one side of the center of the housing 10. An end of the rocker arm 30 away from its rotation center is slidable along the length direction of the linkage arm 40. When the circuit breaker automatically trips, an internal operating handle of the circuit breaker drives the rocker arm 30 to rotate, and the rocker arm 30, via the linkage arm 40, drives the external screwing handle 20 to switch from the closing position to the tripping position. The internal operating handle of the circuit breaker can be driven to move through the external screwing handle 20 to perform actions such as closing, opening, and manual resetting.

[0004] When the circuit breaker switches from the closing state to the tripping state, the external screwing handle 20 is located at the boundary between the closing region 101 and the tripping region 102, making it difficult for a user to intuitively determine whether the circuit breaker is in the closing state or the tripping state. In other words, the external screwing handle 20 has the drawback of indication ambiguity.SUMMARY

[0005] This application provides a manual operation mechanism of a circuit breaker and a circuit breaker that are capable of accurately indicating the closing, tripping, and opening states of the circuit breaker, enabling a user to intuitively determine the current operating state of the circuit breaker.

[0006] This application provides a manual operation mechanism of a circuit breaker. The mechanism includes an external screwing handle, a transmission mechanism, a linkage arm, and a rocker arm.

[0007] The external screwing handle is rotatably disposed outside a housing of the circuit breaker about a first rotation center. The linkage arm is rotatably disposed inside the housing about a second rotation center and is drivingly connected to the external screwing handle via the transmission mechanism. One end of the rocker arm is rotatably disposed inside the housing about a third rotation center, while another end of the rocker arm is slidably connected to the linkage arm. The third rotation center, the second rotation center, and the first rotation center are mutually non-coincident.

[0008] An end of the linkage arm away from the second rotation center is configured to swing along a preset swing arc between a closing position and a tripping position. The second rotation center is located in a sector region enclosed by the preset swing arc and the first rotation center.

[0009] In one or more embodiments, the transmission mechanism includes a first gear and a second gear.

[0010] The first gear is disposed on the linkage arm and configured to rotate coaxially with the linkage arm.

[0011] The second gear meshes with the first gear and is connected to and configured to rotate coaxially with the external screwing handle.

[0012] In one or more embodiments, a total swing angle of the linkage arm is greater than a total swing angle of the external screwing handle, and the number of teeth of the first gear is less than the number of teeth of the second gear.

[0013] In one or more embodiments, the transmission mechanism includes a sector gear and a transmission arm.

[0014] The sector gear is disposed on the linkage arm and configured to rotate coaxially with the linkage arm.

[0015] The transmission arm is connected to the external screwing handle and configured to rotate coaxially with the external screwing handle. The transmission arm is provided with an internal gear ring structure meshing with the sector gear.

[0016] In one or more embodiments, a rotary sleeve is convexly disposed on the linkage arm, is disposed inside the housing and is rotatable about the second rotation center, and the sector gear is connected to an outer wall of the rotary sleeve; the transmission arm is provided with a limiting hole extending along a rotation direction of the transmission arm, and the rotary sleeve penetrates the limiting hole and is slidably engaged with the limiting hole.

[0017] In one or more embodiments, the difference between a swing angle of the linkage arm between the closing position and the tripping position and a swing angle of the linkage arm between the tripping position and an opening position is ±5°.

[0018] In one or more embodiments, a sliding column is disposed at an end of the rocker arm away from the third rotation center, a sliding cavity is disposed on the linkage arm, and the sliding column is slidably disposed in the sliding cavity.

[0019] Alternatively, a sliding sleeve is rotatably disposed at an end of the rocker arm away from the third rotation center and is slidably sleeved on the linkage arm.

[0020] In one or more embodiments, a transmission hole is disposed on the rocker arm and is configured for a swing rod of a circuit breaker operating handle to insert into, the swing rod drives the rocker arm to rotate by pushing a wall of the transmission hole, with a gap formed between the swing rod and the transmission hole.

[0021] In one or more embodiments, an elastic member is connected between the housing and the rocker arm, and the wall of the transmission hole abuts against the swing rod under an elastic force of the elastic member.

[0022] In one or more embodiments, two opposite walls of the transmission hole are each convexly provided with an arc-shaped contact portion, and the swing rod abuts against an arc surface of the arc-shaped contact portion.

[0023] This application also provides a circuit breaker. The circuit breaker includes a housing and the preceding manual operation mechanism of a circuit breaker, and the manual operation mechanism of a circuit breaker is disposed on the housing.BRIEF DESCRIPTION OF DRAWINGS

[0024] FIG. 1 is an external view of a manual operation mechanism of a circuit breaker. FIG. 2 is an internal view of a manual operation mechanism of a circuit breaker. FIG. 3 is a schematic diagram of swing angles of a rocker arm and a linkage arm of a manual operation mechanism of a circuit breaker. FIG. 4 is an external view of a manual operation mechanism of a circuit breaker according to an embodiment of this application. FIG. 5 is an internal view of a manual operation mechanism of a circuit breaker according to embodiment one of this application. FIG. 6 is a schematic diagram illustrating amplification of a swing angle of a linkage arm according to an embodiment of this application. FIG. 7 is a schematic diagram of swing angles of a rocker arm and a linkage arm according to an embodiment of this application. FIG. 8 is a view illustrating the structure of a rocker arm according to an embodiment of this application. FIG. 9 is a view illustrating the structure of a transmission mechanism according to embodiment one of this application. FIG. 10 is a schematic diagram illustrating cooperation between a rocker arm and a circuit breaker operating handle according to an embodiment of this application. FIG. 11 is an internal view of a manual operation mechanism of a circuit breaker according to embodiment two of this application. FIG. 12 is a schematic diagram of a transmission mechanism according to embodiment two of this application. FIG. 13A and FIG. 13B are schematic diagrams of a manual operation mechanism of a circuit breaker indicating a closing position according to embodiment two of this application. FIG. 14A and FIG. 14B are schematic diagrams of a manual operation mechanism of a circuit breaker indicating a tripping position according to embodiment two of this application. FIG. 15A and FIG. 15B are schematic diagrams of a manual operation mechanism of a circuit breaker indicating an opening position according to embodiment two of this application. FIG. 16 is an internal view of another manual operation mechanism according to an embodiment of this application. Reference list

[0025] FIGS. 1 to 3: 10housing 20external screwing handle 30rocker arm 40linkage arm 101closing region 102tripping region 103opening region FIGS. 4 to 16: 1external screwing handle 2transmission mechanism 3linkage arm 4rocker arm 5elastic member 6first fixing member 7second fixing member 8third fixing member 9positioning column 11closing region 12tripping region 13opening region 14stepped column 15hook slot 21first gear 22second gear 23sector gear 24transmission arm 221mounting plate 222first positioning hole 223first fixing hole 241internal gear ring structure 242limiting hole 243second positioning hole 244second fixing hole 245thickened protrusion 31mounting hole 32cylinder 33sliding cavity 34rotary sleeve 41sliding column 42transmission hole 43hanging lug 421arc-shaped contact portion 100housing 200circuit breaker operating handle 101operation mechanism mounting shell 102circuit breaker mounting shell 201swing rod 202arc-shaped swing portion 1000preset swing arc DETAILED DESCRIPTION

[0026] This application is described below in conjunction with drawings and embodiments. The embodiments described herein are only intended to explain and not to limit this application. For ease of description, only part, not all, of structures related to this application are illustrated in the drawings.

[0027] In the description of this application, unless otherwise specified and limited, the term "connected to each other", "connected", or "secured" is to be construed in a broad sense, for example, as securely connected, detachably connected, or integrated; mechanically connected or electrically connected; directly connected to each other or indirectly connected to each other via an intermediary; or internally connected between two elements or interaction relations between two elements. The specific meanings of these terms in this application may be understood based on actual circumstances.

[0028] In this application, unless otherwise specified and limited, when a first feature is described as "on" or "below" a second feature, the first feature and the second feature may be in direct contact or be in contact via another feature between the two features instead of being in direct contact. Moreover, when the first feature is "on", "above", or "over" the second feature, the first feature is right on, above, or over the second feature, or the first feature is obliquely on, above, or over the second feature, or the first feature is simply at a higher level than the second feature. When the first feature is "under", "below", or "underneath" the second feature, the first feature is right under, below, or underneath the second feature, or the first feature is obliquely under, below, or underneath the second feature, or the first feature is simply at a lower level than the second feature.

[0029] In the description of the embodiments, it is to be noted that orientations or position relations indicated by terms such as "above", "below", "left", and "right" are based on the drawings. These orientations or position relations are intended only to facilitate the description and simplify an operation and not to indicate or imply that a device or element referred to must have such particular orientations or must be configured or operated in such particular orientations. Thus, these orientations or position relations are not to be construed as limiting this application. In addition, terms "first" and "second" are used only to distinguish between descriptions and have no special meaning.

[0030] As shown in FIG. 3, a modeling analysis of a manual operation mechanism of a circuit breaker shows that the swing angle (13°) of the rocker arm 30 in the "closing-tripping" phase is significantly smaller than the swing angle (32°) in the "tripping-opening" phase, resulting in the swing angle (21°) of the linkage arm 40 in the "closing-tripping" phase being significantly smaller than the swing angle (70°) in the "tripping-opening" phase. Since the external screwing handle 20 rotates synchronously with the linkage arm 40 and shares the same rotation center, the swing amplitude of the linkage arm 40 is proportionally mapped to the external screwing handle 20, causing the swing amplitude of the external screwing handle 20 in the "closing-tripping" phase to be significantly smaller than the swing amplitude in the "tripping-opening" phase, with a swing amplitude ratio of 21:70 for the two phases. When the circuit breaker switches from a closing state to a tripping state, the external screwing handle 20 is located at the boundary between the closing region 101 and the tripping region 102, making it difficult for a user to intuitively determine whether the circuit breaker is in the closing state or the tripping state. In other words, the external screwing handle 20 has the drawback of unclear indication.Embodiment one

[0031] As shown in FIG. 4 and FIG. 5, this embodiment provides a manual operation mechanism of a circuit breaker that is capable of accurately indicating the closing, tripping, and opening states of the circuit breaker, enabling a user to intuitively determine the current operating state of the circuit breaker. The manual operation mechanism of a circuit breaker includes an external screwing handle 1, a transmission mechanism 2, a linkage arm 3, and a rocker arm 4. When the circuit breaker switches between the closing state, tripping state, and opening state, the external screwing handle 1, the transmission mechanism 2, the linkage arm 3, and the rocker arm 4 each have corresponding closing, tripping, and opening positions.

[0032] As shown in FIG. 4 to FIG. 7, the external screwing handle 1 is disposed outside a housing 100 of the circuit breaker and rotatable about a first rotation center O1; the linkage arm 3 is rotatably disposed inside the housing 100 about a second rotation center O2 and is drivingly connected to the external screwing handle 1 via the transmission mechanism 2, enabling motion transmission between the linkage arm 3 and the external screwing handle 1; one end of the rocker arm 4 is disposed inside the housing 100 and is rotatable about a third rotation center O3, another end of the rocker arm 4 is slidably connected to the linkage arm 3, and the third rotation center O3, the second rotation center O2, and the first rotation center O1 are not coincident with each other.

[0033] That is, the rocker arm 4 and the linkage arm 3 form a swing guide bar mechanism. The rocker arm 4 can be driven to rotate by a circuit breaker operating handle 200 (with reference to FIG. 10). When the rocker arm 4 rotates, it drives the linkage arm 3 to rotate through the sliding connection with the linkage arm 3, and the linkage arm 3, via the transmission mechanism 2, drives the external screwing handle 1 to switch from the closing position to the tripping position, completing the automatic tripping of the circuit breaker. Conversely, when a user manually rotates the external screwing handle 1, the external screwing handle 1 can drive the linkage arm 3 to rotate via the transmission mechanism 2, and the linkage arm 3, via the rocker arm 4, drives the circuit breaker operating handle 200 to switch to the closing position or the opening position.

[0034] As shown in FIG. 6, an end of the linkage arm 3 away from the second rotation center O2 swings along a preset swing arc 1000 between the closing position and the tripping position, and the second rotation center O2 is located in a sector region enclosed by the preset swing arc 1000 and the first rotation center O1.

[0035] In an embodiment, the rotation center of the linkage arm 3 is set at the first rotation center O1 (that is, the rotation center of the linkage arm 3 coincides with that of the external screwing handle 1), and the swing angle of the linkage arm 3 when the linkage arm 3 sweeps the preset swing arc 1000 is relatively small. In the manual operation mechanism of a circuit breaker provided in this application, the rotation center of the linkage arm 3 is adjusted to be within the sector region enclosed by the preset swing arc 1000 and the first rotation center O1 so that the rotation center of the linkage arm 3 is closer to the preset swing arc 1000 compared with the related art, thereby increasing the swing angle of the linkage arm 3 when the linkage arm 3 sweeps the preset swing arc 1000. That is, the swing angle of the linkage arm 3 between the closing position and the tripping position is increased, and the swing angle, mapped to the external screwing handle 1, enlarges the swing amplitude of the external screwing handle 1 between the closing position and the tripping position, enabling accurate and clear indication of the closing and tripping states of the circuit breaker. A user can intuitively determine the current operating state of the circuit breaker by observing the position of the external screwing handle 1.

[0036] With continued reference to FIG. 6, in an embodiment, when the linkage arm 3 swings from the closing position to the tripping position about the first rotation center O1, the swing angle is α1. In this embodiment, the rotation center of the linkage arm 3 is adjusted to be closer to the preset swing arc 1000, that is, the rotation center of the linkage arm 3 is adjusted to be located at the second rotation center O2 so that the swing angle of the linkage arm 3 from the closing position to the tripping position about the second rotation center O2 is increased to α2.

[0037] Optionally, after the rotation center of the linkage arm 3 is adjusted to be located at the second rotation center O2, the following condition is satisfied: The difference between the swing angle of the linkage arm 3 between the closing position and the tripping position and the swing angle of the linkage arm 3 between the tripping position and the opening position is ±5° so that the ratio of the swing angle of the linkage arm 3 in the "closing-tripping" phase to the swing angle in the "tripping-opening" phase is close to 1:1. This is mapped to the external screwing handle 1, making the closing, tripping, and opening positions of the external screwing handle 1 more distinguishable.

[0038] With reference to FIG. 7, the swing angles of the rocker arm 4 between the closing, tripping, and opening positions are consistent with those in the prior art, determined by the inherent characteristics of the corresponding circuit breaker model. Exemplarily, the swing angle of the rocker arm 4 in the "closing-tripping" phase is 13° and in the "tripping-opening" phase is 32°. After the rotation center of the linkage arm 3 is adjusted to be located at the second rotation center O2, the swing angle of the linkage arm 3 in the "closing-tripping" phase is amplified to 64°, and the swing angle of the linkage arm 3 in the "tripping-opening" phase is adjusted to 61°. The swing angle is mapped to the external screwing handle 1 so that the tripping position of the external screwing handle 1 is located approximately at the midpoint between the closing and opening positions, enabling a user to easily distinguish the three positions of the external screwing handle 1.

[0039] With reference to FIG. 4, the housing 100 of the circuit breaker includes an operation mechanism mounting shell 101 and a circuit breaker mounting shell 102. The external screwing handle 1, the transmission mechanism 2, the linkage arm 3, and the rocker arm 4 are all disposed on the operation mechanism mounting shell 101 and are connected as an integral unit. The circuit breaker operating handle 200 is disposed on the circuit breaker mounting shell 102. The operation mechanism mounting shell 101 is installed to the circuit breaker mounting shell 102 via screws and the circuit breaker operating handle 200 is engaged with the rocker arm 4 so that the manual operation mechanism of the circuit breaker can be installed on the circuit breaker.

[0040] In this embodiment, with reference to the orientation in FIG. 5, the first rotation center O1 is the center of the operation mechanism mounting shell 101, the second rotation center O2 is located to the upper right of the first rotation center O1, and the third rotation center O3 is located to the left of the first rotation center O1. The linkage arm 3 is rotatably connected to the operation mechanism mounting shell 101 via a first fixing member 6. One end of the external screwing handle 1 rotatably penetrates the operation mechanism mounting shell 101 and is connected to the transmission mechanism 2 via a second fixing member 7. The rocker arm 4 is rotatably mounted on the operation mechanism mounting shell 101 via a third fixing member 8. The first fixing member 6, the second fixing member 7, and the third fixing member 8 may each be a screw.

[0041] In this embodiment, with reference to FIG. 5 and FIG. 9, the transmission mechanism 2 includes a first gear 21 and a second gear 22; the first gear 21 is disposed on the linkage arm 3 and rotates coaxially with the linkage arm 3; the second gear 22 meshes with the first gear 21, and the second gear 22 is connected to the external screwing handle 1 and rotates coaxially with the external screwing handle 1. The transmission mechanism 2 includes the first gear 21 and the second gear 22 that mesh with each other. The linkage arm 3 is provided with a mounting hole 31. One side of the linkage arm 3 is convexly provided with a cylinder 32 at a position directly opposite the mounting hole 31, and the axis of the cylinder 32 is aligned with the axis of the mounting hole 31. The first fixing member 6 passes through the mounting hole 31 and the cylinder 32 and is connected to the operation mechanism mounting shell 101. The first gear 21 is coaxially disposed on the cylinder 32, enabling the first gear 21 and the linkage arm 3 to rotate coaxially. The second gear 22 is connected to the external screwing handle 1 via the second fixing member 7 and rotates coaxially with the external screwing handle 1. The first gear 21 and the second gear 22 that mesh with each other can achieve motion transmission between the linkage arm 3 and the external screwing handle 1.

[0042] In this embodiment, the total swing angle of the linkage arm 3 is greater than the total swing angle of the external screwing handle 1. Exemplarily, the total swing angle (the swing angle from the closing position to the opening position) of the external screwing handle 1 is 90°, and two extreme positions of the external screwing handle 1 are in the horizontal and vertical directions, respectively, making the indication more intuitive. The total swing angle of the linkage arm 3 is an obtuse angle. For example, as shown in FIG. 7 of this embodiment, the total swing angle of the linkage arm 3 is 64° + 61° = 125°. To reduce the total swing angle of the external screwing handle 1 to 90°, in this embodiment, the number of teeth of the first gear 21 is set to be less than the number of teeth of the second gear 22. When the linkage arm 3 rotates through a certain angle, the rotation angle of the first gear 21 is greater than that of the second gear 22, thereby reducing the total swing angle of the external screwing handle 1.

[0043] Moreover, when the first gear 21 transmits motion to the second gear 22 with a greater number of teeth, the torque of the second gear 22 is increased, facilitating the rotation of the external screwing handle 1 and avoiding rotation jamming of the external screwing handle 1.

[0044] With reference to FIG. 9 and FIG. 16, the second gear 22 is provided with a first positioning hole 222 and a first fixing hole 223, an end of the external screwing handle 1 close to the second gear 22 is convexly provided with a positioning column 9, and the positioning column 9 is inserted into the first positioning hole 222 to position the mounting position of the second gear 22; the second fixing member 7 passes through the first fixing hole 223 and is connected to the external screwing handle 1.

[0045] With continued reference to FIG. 9, the second gear 22 is coaxially provided with a mounting plate 221, and the mounting plate 221 can provide a reference for the processing positions of the first positioning hole 222 and the first fixing hole 223, ensuring the accuracy of the processing positions.

[0046] To achieve the sliding connection between the rocker arm 4 and the linkage arm 3, in an optional embodiment, with reference to FIG. 5 and FIG. 8, a sliding column 41 is disposed on an end of the rocker arm 4 away from the third rotation center O3, a sliding cavity 33 is disposed on the linkage arm 3, and the sliding column 41 is slidably disposed in the sliding cavity 33. The cooperation of the sliding column 41 and the sliding cavity 33 can guide the sliding between the rocker arm 4 and the linkage arm 3 and prevent the separation between the rocker arm 4 and the linkage arm 3.

[0047] In another alternative embodiment, a sliding sleeve may be rotatably disposed on an end of the rocker arm 4 away from the third rotation center O3 and may be slidably sleeved on the linkage arm 3, which also achieves a sliding connection between the rocker arm 4 and the linkage arm 3.

[0048] With reference to FIG. 5, FIG. 8, and FIG. 10, a transmission hole 42 is disposed on the rocker arm 4. The circuit breaker operating handle 200 includes an arc-shaped swing portion 202 and a swing rod 201, and the swing rod 201 is disposed on the back side of the arc-shaped swing portion 202. The arc-shaped swing portion 202 extends into the interior of the circuit breaker mounting shell 102 and is connected to a four-bar linkage mechanism of the circuit breaker. The swing rod 201 extends outside the circuit breaker mounting shell 102 and is inserted into the transmission hole 42 of the rocker arm 4. When the circuit breaker switches states, the four-bar linkage mechanism drives the arc-shaped swing portion 202 to swing, causing the swing rod 201 to drive the rocker arm 4 to rotate by pushing the wall of the transmission hole 42. A gap is formed between the swing rod 201 and the transmission hole 42, facilitating the insertion of the swing rod 201 into the transmission hole 42 on one hand, and avoiding interfering with the rotation of the rocker arm 4 about the third rotation center O3 on the other hand (if no gap exists between the swing rod 201 and the transmission hole 42, the swing of the swing rod 201 causes the rocker arm 4 to twist).

[0049] In one or more embodiments, with reference to FIG. 5, an elastic member 5 is connected between the housing 100 and the rocker arm 4. The elastic member 5 is connected between the operation mechanism mounting shell 101 and the rocker arm 4, and the wall of the transmission hole 42 abuts against the swing rod 201 under the elastic force of the elastic member 5, preventing the swing rod 201 from shaking in the transmission hole 42. In one or more embodiments, two opposite walls of the transmission hole 42 are each convexly provided with an arc-shaped contact portion 421, and the swing rod 201 abuts against the arc surface of the arc-shaped contact portion 421, driving the rocker arm 4 to rotate by pushing the arc surface of the arc-shaped contact portion 421. The arrangement of the arc-shaped contact portion 421 prevents the swing rod 201 from contacting sharp parts within the transmission hole 42. The elastic member 5 may be a spring.

[0050] As shown in FIG. 5 and FIG. 10, the rocker arm 4 is provided with a hanging lug 43, and a hook at one end of the spring is hooked into a hook hole of the hanging lug 43. The inner wall of the operation mechanism mounting shell 101 is provided with a stepped column 14, and a screw is threaded onto the stepped column 14. A hook slot 15 is formed between the head of the screw and the stepped surface of the stepped column 14, and a hook at the other end of the spring is hooked into the hook slot 15.

[0051] This embodiment also provides a circuit breaker, including a housing 100 and the preceding manual operation mechanism of a circuit breaker. The manual operation mechanism of a circuit breaker is disposed on the housing 100 and linked with the circuit breaker operating handle 200. The closing, tripping, and opening positions of the external screwing handle 1 of the circuit breaker are distinguishable, accurately indicating the current operating state of the circuit breaker.Embodiment two

[0052] With reference to the orientation in FIG. 4, the external screwing handle 1 of an original circuit breaker is in the vertical direction at the closing position and in the horizontal direction at the opening position, and the screwing direction from the opening position to the closing position is clockwise, facilitating user operation. With reference to FIG. 5, if the rocker arm 4 rotates upward to the closing position, the linkage arm 3 and the first gear 21 both rotate counterclockwise, and the second gear 22 drives the external screwing handle 1 to rotate clockwise. With reference to FIG. 4, the external screwing handle 1 needs to be rotated counterclockwise to switch to the closing position. Therefore, with reference to the orientation in FIG. 4, the closing region 11, tripping region 12, and opening region 13 are sequentially arranged in a clockwise direction, requiring counterclockwise rotation from the opening position to the closing position, which is inconsistent with user operation habits. That is, the opposite rotation directions of the linkage arm 3 and the external screwing handle 1 cause the preceding issue.

[0053] Based on the preceding issue and the same inventive concept as embodiment one, as shown in FIG. 11 to FIG. 15, this embodiment provides a manual operation mechanism of a circuit breaker, differing from embodiment one in the following:

[0054] In this embodiment, with reference to FIG. 11 and FIG. 12, the transmission mechanism 2 includes a sector gear 23 and a transmission arm 24. The sector gear 23 is disposed on the linkage arm 3 and rotates coaxially with the linkage arm 3. The transmission arm 24 is connected to the external screwing handle 1 and rotates coaxially with the external screwing handle 1. The transmission arm 24 is provided with an internal gear ring structure 241 meshing with the sector gear 23. When the linkage arm 3 rotates, the sector gear 23 meshes with the internal gear ring structure 241 to drive the transmission arm 24 to rotate, and the transmission arm 24 in turn drives the external screwing handle 1 to rotate. The rotation directions of the linkage arm 3, the transmission arm 24, and the external screwing handle 1 are the same, ensuring that the screwing direction of the external screwing handle 1 from tripping to opening and from tripping to closing is consistent with that of the original circuit breaker, which aligns with user operation habits.

[0055] As shown in FIG. 13A, FIG. 14A, and FIG. 15A, these are schematic diagrams of the manual operation mechanism of a circuit breaker in the closing state, tripping state, and opening state, respectively. When the circuit breaker automatically switches from the closing state to the tripping state and from the tripping state to the opening state, as shown in FIG. 13B, FIG. 14B, and FIG. 15B, the external screwing handle 1 rotates counterclockwise. When a user rotates the external screwing handle 1 to achieve opening or closing, the screwing direction aligns with user operation habits, avoiding misoperation.

[0056] With reference to FIG. 12, a rotary sleeve 34 is convexly disposed on the linkage arm 3 and is coaxially aligned with a mounting hole 31 of the linkage arm 3, and a first fixing member 6 passes through the mounting hole 31 and the rotary sleeve 34 and is connected to the operation mechanism mounting shell 101. The rotary sleeve 34 is rotatably disposed in the housing 100 about the second rotation center O2, and the sector gear 23 is connected to an outer wall of the rotary sleeve 34. The transmission arm 24 is provided with a limiting hole 242 extending along the rotation direction of the transmission arm 24. The rotary sleeve 34 penetrates the limiting hole 242 and is slidably engaged with the limiting hole 242, restricting over-rotation of the transmission arm 24.

[0057] The transmission arm 24 is provided with a second positioning hole 243 and a second fixing hole 244. The second positioning hole 243 engages with a positioning column 9 on the external screwing handle 1 for pre-positioning the installation of the transmission arm 24, and the second fixing member 7 passes through the second fixing hole 244 and is screwed to the external screwing handle 1.

[0058] In one or more embodiments, the transmission arm 24 is provided with a circular thickened protrusion 245, which enhances the strength of the transmission arm 24 on the one hand and facilitates positioning the processing positions of the second positioning hole 243 and the second fixing hole 244 on the other hand.

[0059] In summary, in this application, by adjusting the rotation center of the linkage arm 3 the tripping position of the external screwing handle 1 is adjusted to the midpoint between the closing position and the opening position under the premise of maintaining the total swing angle of the external screwing handle 1 unchanged. That is, when the external screwing handle 1 is in the tripping position, it is located at the middle of the tripping region 12, rather than at the boundary with the closing region 11 so that a user can intuitively determine the current state of the circuit breaker.

[0060] This application provides a manual operation mechanism of a circuit breaker and a circuit breaker including the manual operation mechanism. The rocker arm 4 can be driven to rotate by the circuit breaker operating handle 200. When the rocker arm rotates, it drives the linkage arm to rotate through the sliding connection with the linkage arm, and the linkage arm, via the transmission mechanism, drives the external screwing handle to switch from the closing position to the tripping position, completing the automatic tripping of the circuit breaker. Conversely, when a user manually rotates the external screwing handle, the external screwing handle can drive the linkage arm to rotate via the transmission mechanism, and the linkage arm, via the rocker arm, drives the circuit breaker operating handle to switch to the closing position or the opening position. In an embodiment, the rotation center of the linkage arm is set at the first rotation center (that is, the rotation center of the linkage arm coincides with that of the external screwing handle), the swing angle of the linkage arm when the linkage arm sweeps the preset swing arc is relatively small. In the manual operation mechanism provided in this application, the rotation center of the linkage arm is adjusted to be within the sector region enclosed by the preset swing arc and the first rotation center so that the rotation center of the linkage arm is closer to the preset swing arc, thereby increasing the swing angle of the linkage arm when the linkage arm sweeps the preset swing arc. That is, the swing angle of the linkage arm between the closing position and the tripping position is increased, and the swing angle, mapped to the external screwing handle, enlarges the swing amplitude of the external screwing handle between the closing position and the tripping position, enabling accurate and clear indication of the closing and tripping states of the circuit breaker. A user can intuitively determine the current operating state of the circuit breaker by observing the position of the external screwing handle.

Examples

embodiment one

Embodiment one

[0031]As shown in FIG. 4 and FIG. 5, this embodiment provides a manual operation mechanism of a circuit breaker that is capable of accurately indicating the closing, tripping, and opening states of the circuit breaker, enabling a user to intuitively determine the current operating state of the circuit breaker. The manual operation mechanism of a circuit breaker includes an external screwing handle 1, a transmission mechanism 2, a linkage arm 3, and a rocker arm 4. When the circuit breaker switches between the closing state, tripping state, and opening state, the external screwing handle 1, the transmission mechanism 2, the linkage arm 3, and the rocker arm 4 each have corresponding closing, tripping, and opening positions.

[0032]As shown in FIG. 4 to FIG. 7, the external screwing handle 1 is disposed outside a housing 100 of the circuit breaker and rotatable about a first rotation center O1; the linkage arm 3 is rotatably disposed inside the housing 100 about a second r...

embodiment two

Embodiment two

[0052]With reference to the orientation in FIG. 4, the external screwing handle 1 of an original circuit breaker is in the vertical direction at the closing position and in the horizontal direction at the opening position, and the screwing direction from the opening position to the closing position is clockwise, facilitating user operation. With reference to FIG. 5, if the rocker arm 4 rotates upward to the closing position, the linkage arm 3 and the first gear 21 both rotate counterclockwise, and the second gear 22 drives the external screwing handle 1 to rotate clockwise. With reference to FIG. 4, the external screwing handle 1 needs to be rotated counterclockwise to switch to the closing position. Therefore, with reference to the orientation in FIG. 4, the closing region 11, tripping region 12, and opening region 13 are sequentially arranged in a clockwise direction, requiring counterclockwise rotation from the opening position to the closing position, which is inco...

[0001] This application claims priority to Chinese Patent Application No. 202310734993.4 filed with the China National Intellectual Property Administration (CNIPA) on Jun. 20, 2023, the disclosure of which is incorporated herein by reference in its entirety.TECHNICAL FIELD

[0002] This application relates to the technical field of low-voltage electrical appliances, for example, to a manual operation mechanism of a circuit breaker and a circuit breaker.BACKGROUND

[0003] As shown in FIG. 1 and FIG. 2, a manual operation mechanism of a circuit breaker includes an external screwing handle 20 disposed outside a housing 10 and a linkage portion disposed inside the housing 10. The outer wall of the housing 10 is marked with a closing region 101, a tripping region 102, and an opening region 103. An indicating end of the external screwing handle 20 rotates among these three regions to indicate the closing, tripping, and opening states of the circuit breaker. The linkage portion includes a rocker arm 30 and a linkage arm 40. One end of the linkage arm 40 is rotatably connected to the housing 10, and is fixedly connected to the external screwing handle 20 so that the linkage arm 40 and the external screwing handle 20 rotate synchronously. The rotation center of the linkage arm 40 is located at the center of the housing 10. One end of the rocker arm 30 is rotatably connected to the housing 10, and the rotation center of the rocker arm 30 is located at one side of the center of the housing 10. An end of the rocker arm 30 away from its rotation center is slidable along the length direction of the linkage arm 40. When the circuit breaker automatically trips, an internal operating handle of the circuit breaker drives the rocker arm 30 to rotate, and the rocker arm 30, via the linkage arm 40, drives the external screwing handle 20 to switch from the closing position to the tripping position. The internal operating handle of the circuit breaker can be driven to move through the external screwing handle 20 to perform actions such as closing, opening, and manual resetting.

[0004] When the circuit breaker switches from the closing state to the tripping state, the external screwing handle 20 is located at the boundary between the closing region 101 and the tripping region 102, making it difficult for a user to intuitively determine whether the circuit breaker is in the closing state or the tripping state. In other words, the external screwing handle 20 has the drawback of indication ambiguity.SUMMARY

[0005] This application provides a manual operation mechanism of a circuit breaker and a circuit breaker that are capable of accurately indicating the closing, tripping, and opening states of the circuit breaker, enabling a user to intuitively determine the current operating state of the circuit breaker.

[0006] This application provides a manual operation mechanism of a circuit breaker. The mechanism includes an external screwing handle, a transmission mechanism, a linkage arm, and a rocker arm.

[0007] The external screwing handle is rotatably disposed outside a housing of the circuit breaker about a first rotation center. The linkage arm is rotatably disposed inside the housing about a second rotation center and is drivingly connected to the external screwing handle via the transmission mechanism. One end of the rocker arm is rotatably disposed inside the housing about a third rotation center, while another end of the rocker arm is slidably connected to the linkage arm. The third rotation center, the second rotation center, and the first rotation center are mutually non-coincident.

[0008] An end of the linkage arm away from the second rotation center is configured to swing along a preset swing arc between a closing position and a tripping position. The second rotation center is located in a sector region enclosed by the preset swing arc and the first rotation center.

[0009] In one or more embodiments, the transmission mechanism includes a first gear and a second gear.

[0010] The first gear is disposed on the linkage arm and configured to rotate coaxially with the linkage arm.

[0011] The second gear meshes with the first gear and is connected to and configured to rotate coaxially with the external screwing handle.

[0012] In one or more embodiments, a total swing angle of the linkage arm is greater than a total swing angle of the external screwing handle, and the number of teeth of the first gear is less than the number of teeth of the second gear.

[0013] In one or more embodiments, the transmission mechanism includes a sector gear and a transmission arm.

[0014] The sector gear is disposed on the linkage arm and configured to rotate coaxially with the linkage arm.

[0015] The transmission arm is connected to the external screwing handle and configured to rotate coaxially with the external screwing handle. The transmission arm is provided with an internal gear ring structure meshing with the sector gear.

[0016] In one or more embodiments, a rotary sleeve is convexly disposed on the linkage arm, is disposed inside the housing and is rotatable about the second rotation center, and the sector gear is connected to an outer wall of the rotary sleeve; the transmission arm is provided with a limiting hole extending along a rotation direction of the transmission arm, and the rotary sleeve penetrates the limiting hole and is slidably engaged with the limiting hole.

[0017] In one or more embodiments, the difference between a swing angle of the linkage arm between the closing position and the tripping position and a swing angle of the linkage arm between the tripping position and an opening position is ±5°.

[0018] In one or more embodiments, a sliding column is disposed at an end of the rocker arm away from the third rotation center, a sliding cavity is disposed on the linkage arm, and the sliding column is slidably disposed in the sliding cavity.

[0019] Alternatively, a sliding sleeve is rotatably disposed at an end of the rocker arm away from the third rotation center and is slidably sleeved on the linkage arm.

[0020] In one or more embodiments, a transmission hole is disposed on the rocker arm and is configured for a swing rod of a circuit breaker operating handle to insert into, the swing rod drives the rocker arm to rotate by pushing a wall of the transmission hole, with a gap formed between the swing rod and the transmission hole.

[0021] In one or more embodiments, an elastic member is connected between the housing and the rocker arm, and the wall of the transmission hole abuts against the swing rod under an elastic force of the elastic member.

[0022] In one or more embodiments, two opposite walls of the transmission hole are each convexly provided with an arc-shaped contact portion, and the swing rod abuts against an arc surface of the arc-shaped contact portion.

[0023] This application also provides a circuit breaker. The circuit breaker includes a housing and the preceding manual operation mechanism of a circuit breaker, and the manual operation mechanism of a circuit breaker is disposed on the housing.BRIEF DESCRIPTION OF DRAWINGS

[0024] FIG. 1 is an external view of a manual operation mechanism of a circuit breaker. FIG. 2 is an internal view of a manual operation mechanism of a circuit breaker. FIG. 3 is a schematic diagram of swing angles of a rocker arm and a linkage arm of a manual operation mechanism of a circuit breaker. FIG. 4 is an external view of a manual operation mechanism of a circuit breaker according to an embodiment of this application. FIG. 5 is an internal view of a manual operation mechanism of a circuit breaker according to embodiment one of this application. FIG. 6 is a schematic diagram illustrating amplification of a swing angle of a linkage arm according to an embodiment of this application. FIG. 7 is a schematic diagram of swing angles of a rocker arm and a linkage arm according to an embodiment of this application. FIG. 8 is a view illustrating the structure of a rocker arm according to an embodiment of this application. FIG. 9 is a view illustrating the structure of a transmission mechanism according to embodiment one of this application. FIG. 10 is a schematic diagram illustrating cooperation between a rocker arm and a circuit breaker operating handle according to an embodiment of this application. FIG. 11 is an internal view of a manual operation mechanism of a circuit breaker according to embodiment two of this application. FIG. 12 is a schematic diagram of a transmission mechanism according to embodiment two of this application. FIG. 13A and FIG. 13B are schematic diagrams of a manual operation mechanism of a circuit breaker indicating a closing position according to embodiment two of this application. FIG. 14A and FIG. 14B are schematic diagrams of a manual operation mechanism of a circuit breaker indicating a tripping position according to embodiment two of this application. FIG. 15A and FIG. 15B are schematic diagrams of a manual operation mechanism of a circuit breaker indicating an opening position according to embodiment two of this application. FIG. 16 is an internal view of another manual operation mechanism according to an embodiment of this application. Reference list

[0025] FIGS. 1 to 3: 10housing 20external screwing handle 30rocker arm 40linkage arm 101closing region 102tripping region 103opening region FIGS. 4 to 16: 1external screwing handle 2transmission mechanism 3linkage arm 4rocker arm 5elastic member 6first fixing member 7second fixing member 8third fixing member 9positioning column 11closing region 12tripping region 13opening region 14stepped column 15hook slot 21first gear 22second gear 23sector gear 24transmission arm 221mounting plate 222first positioning hole 223first fixing hole 241internal gear ring structure 242limiting hole 243second positioning hole 244second fixing hole 245thickened protrusion 31mounting hole 32cylinder 33sliding cavity 34rotary sleeve 41sliding column 42transmission hole 43hanging lug 421arc-shaped contact portion 100housing 200circuit breaker operating handle 101operation mechanism mounting shell 102circuit breaker mounting shell 201swing rod 202arc-shaped swing portion 1000preset swing arc DETAILED DESCRIPTION

[0026] This application is described below in conjunction with drawings and embodiments. The embodiments described herein are only intended to explain and not to limit this application. For ease of description, only part, not all, of structures related to this application are illustrated in the drawings.

[0027] In the description of this application, unless otherwise specified and limited, the term "connected to each other", "connected", or "secured" is to be construed in a broad sense, for example, as securely connected, detachably connected, or integrated; mechanically connected or electrically connected; directly connected to each other or indirectly connected to each other via an intermediary; or internally connected between two elements or interaction relations between two elements. The specific meanings of these terms in this application may be understood based on actual circumstances.

[0028] In this application, unless otherwise specified and limited, when a first feature is described as "on" or "below" a second feature, the first feature and the second feature may be in direct contact or be in contact via another feature between the two features instead of being in direct contact. Moreover, when the first feature is "on", "above", or "over" the second feature, the first feature is right on, above, or over the second feature, or the first feature is obliquely on, above, or over the second feature, or the first feature is simply at a higher level than the second feature. When the first feature is "under", "below", or "underneath" the second feature, the first feature is right under, below, or underneath the second feature, or the first feature is obliquely under, below, or underneath the second feature, or the first feature is simply at a lower level than the second feature.

[0029] In the description of the embodiments, it is to be noted that orientations or position relations indicated by terms such as "above", "below", "left", and "right" are based on the drawings. These orientations or position relations are intended only to facilitate the description and simplify an operation and not to indicate or imply that a device or element referred to must have such particular orientations or must be configured or operated in such particular orientations. Thus, these orientations or position relations are not to be construed as limiting this application. In addition, terms "first" and "second" are used only to distinguish between descriptions and have no special meaning.

[0030] As shown in FIG. 3, a modeling analysis of a manual operation mechanism of a circuit breaker shows that the swing angle (13°) of the rocker arm 30 in the "closing-tripping" phase is significantly smaller than the swing angle (32°) in the "tripping-opening" phase, resulting in the swing angle (21°) of the linkage arm 40 in the "closing-tripping" phase being significantly smaller than the swing angle (70°) in the "tripping-opening" phase. Since the external screwing handle 20 rotates synchronously with the linkage arm 40 and shares the same rotation center, the swing amplitude of the linkage arm 40 is proportionally mapped to the external screwing handle 20, causing the swing amplitude of the external screwing handle 20 in the "closing-tripping" phase to be significantly smaller than the swing amplitude in the "tripping-opening" phase, with a swing amplitude ratio of 21:70 for the two phases. When the circuit breaker switches from a closing state to a tripping state, the external screwing handle 20 is located at the boundary between the closing region 101 and the tripping region 102, making it difficult for a user to intuitively determine whether the circuit breaker is in the closing state or the tripping state. In other words, the external screwing handle 20 has the drawback of unclear indication.Embodiment one

[0031] As shown in FIG. 4 and FIG. 5, this embodiment provides a manual operation mechanism of a circuit breaker that is capable of accurately indicating the closing, tripping, and opening states of the circuit breaker, enabling a user to intuitively determine the current operating state of the circuit breaker. The manual operation mechanism of a circuit breaker includes an external screwing handle 1, a transmission mechanism 2, a linkage arm 3, and a rocker arm 4. When the circuit breaker switches between the closing state, tripping state, and opening state, the external screwing handle 1, the transmission mechanism 2, the linkage arm 3, and the rocker arm 4 each have corresponding closing, tripping, and opening positions.

[0032] As shown in FIG. 4 to FIG. 7, the external screwing handle 1 is disposed outside a housing 100 of the circuit breaker and rotatable about a first rotation center O1; the linkage arm 3 is rotatably disposed inside the housing 100 about a second rotation center O2 and is drivingly connected to the external screwing handle 1 via the transmission mechanism 2, enabling motion transmission between the linkage arm 3 and the external screwing handle 1; one end of the rocker arm 4 is disposed inside the housing 100 and is rotatable about a third rotation center O3, another end of the rocker arm 4 is slidably connected to the linkage arm 3, and the third rotation center O3, the second rotation center O2, and the first rotation center O1 are not coincident with each other.

[0033] That is, the rocker arm 4 and the linkage arm 3 form a swing guide bar mechanism. The rocker arm 4 can be driven to rotate by a circuit breaker operating handle 200 (with reference to FIG. 10). When the rocker arm 4 rotates, it drives the linkage arm 3 to rotate through the sliding connection with the linkage arm 3, and the linkage arm 3, via the transmission mechanism 2, drives the external screwing handle 1 to switch from the closing position to the tripping position, completing the automatic tripping of the circuit breaker. Conversely, when a user manually rotates the external screwing handle 1, the external screwing handle 1 can drive the linkage arm 3 to rotate via the transmission mechanism 2, and the linkage arm 3, via the rocker arm 4, drives the circuit breaker operating handle 200 to switch to the closing position or the opening position.

[0034] As shown in FIG. 6, an end of the linkage arm 3 away from the second rotation center O2 swings along a preset swing arc 1000 between the closing position and the tripping position, and the second rotation center O2 is located in a sector region enclosed by the preset swing arc 1000 and the first rotation center O1.

[0035] In an embodiment, the rotation center of the linkage arm 3 is set at the first rotation center O1 (that is, the rotation center of the linkage arm 3 coincides with that of the external screwing handle 1), and the swing angle of the linkage arm 3 when the linkage arm 3 sweeps the preset swing arc 1000 is relatively small. In the manual operation mechanism of a circuit breaker provided in this application, the rotation center of the linkage arm 3 is adjusted to be within the sector region enclosed by the preset swing arc 1000 and the first rotation center O1 so that the rotation center of the linkage arm 3 is closer to the preset swing arc 1000 compared with the related art, thereby increasing the swing angle of the linkage arm 3 when the linkage arm 3 sweeps the preset swing arc 1000. That is, the swing angle of the linkage arm 3 between the closing position and the tripping position is increased, and the swing angle, mapped to the external screwing handle 1, enlarges the swing amplitude of the external screwing handle 1 between the closing position and the tripping position, enabling accurate and clear indication of the closing and tripping states of the circuit breaker. A user can intuitively determine the current operating state of the circuit breaker by observing the position of the external screwing handle 1.

[0036] With continued reference to FIG. 6, in an embodiment, when the linkage arm 3 swings from the closing position to the tripping position about the first rotation center O1, the swing angle is α1. In this embodiment, the rotation center of the linkage arm 3 is adjusted to be closer to the preset swing arc 1000, that is, the rotation center of the linkage arm 3 is adjusted to be located at the second rotation center O2 so that the swing angle of the linkage arm 3 from the closing position to the tripping position about the second rotation center O2 is increased to α2.

[0037] Optionally, after the rotation center of the linkage arm 3 is adjusted to be located at the second rotation center O2, the following condition is satisfied: The difference between the swing angle of the linkage arm 3 between the closing position and the tripping position and the swing angle of the linkage arm 3 between the tripping position and the opening position is ±5° so that the ratio of the swing angle of the linkage arm 3 in the "closing-tripping" phase to the swing angle in the "tripping-opening" phase is close to 1:1. This is mapped to the external screwing handle 1, making the closing, tripping, and opening positions of the external screwing handle 1 more distinguishable.

[0038] With reference to FIG. 7, the swing angles of the rocker arm 4 between the closing, tripping, and opening positions are consistent with those in the prior art, determined by the inherent characteristics of the corresponding circuit breaker model. Exemplarily, the swing angle of the rocker arm 4 in the "closing-tripping" phase is 13° and in the "tripping-opening" phase is 32°. After the rotation center of the linkage arm 3 is adjusted to be located at the second rotation center O2, the swing angle of the linkage arm 3 in the "closing-tripping" phase is amplified to 64°, and the swing angle of the linkage arm 3 in the "tripping-opening" phase is adjusted to 61°. The swing angle is mapped to the external screwing handle 1 so that the tripping position of the external screwing handle 1 is located approximately at the midpoint between the closing and opening positions, enabling a user to easily distinguish the three positions of the external screwing handle 1.

[0039] With reference to FIG. 4, the housing 100 of the circuit breaker includes an operation mechanism mounting shell 101 and a circuit breaker mounting shell 102. The external screwing handle 1, the transmission mechanism 2, the linkage arm 3, and the rocker arm 4 are all disposed on the operation mechanism mounting shell 101 and are connected as an integral unit. The circuit breaker operating handle 200 is disposed on the circuit breaker mounting shell 102. The operation mechanism mounting shell 101 is installed to the circuit breaker mounting shell 102 via screws and the circuit breaker operating handle 200 is engaged with the rocker arm 4 so that the manual operation mechanism of the circuit breaker can be installed on the circuit breaker.

[0040] In this embodiment, with reference to the orientation in FIG. 5, the first rotation center O1 is the center of the operation mechanism mounting shell 101, the second rotation center O2 is located to the upper right of the first rotation center O1, and the third rotation center O3 is located to the left of the first rotation center O1. The linkage arm 3 is rotatably connected to the operation mechanism mounting shell 101 via a first fixing member 6. One end of the external screwing handle 1 rotatably penetrates the operation mechanism mounting shell 101 and is connected to the transmission mechanism 2 via a second fixing member 7. The rocker arm 4 is rotatably mounted on the operation mechanism mounting shell 101 via a third fixing member 8. The first fixing member 6, the second fixing member 7, and the third fixing member 8 may each be a screw.

[0041] In this embodiment, with reference to FIG. 5 and FIG. 9, the transmission mechanism 2 includes a first gear 21 and a second gear 22; the first gear 21 is disposed on the linkage arm 3 and rotates coaxially with the linkage arm 3; the second gear 22 meshes with the first gear 21, and the second gear 22 is connected to the external screwing handle 1 and rotates coaxially with the external screwing handle 1. The transmission mechanism 2 includes the first gear 21 and the second gear 22 that mesh with each other. The linkage arm 3 is provided with a mounting hole 31. One side of the linkage arm 3 is convexly provided with a cylinder 32 at a position directly opposite the mounting hole 31, and the axis of the cylinder 32 is aligned with the axis of the mounting hole 31. The first fixing member 6 passes through the mounting hole 31 and the cylinder 32 and is connected to the operation mechanism mounting shell 101. The first gear 21 is coaxially disposed on the cylinder 32, enabling the first gear 21 and the linkage arm 3 to rotate coaxially. The second gear 22 is connected to the external screwing handle 1 via the second fixing member 7 and rotates coaxially with the external screwing handle 1. The first gear 21 and the second gear 22 that mesh with each other can achieve motion transmission between the linkage arm 3 and the external screwing handle 1.

[0042] In this embodiment, the total swing angle of the linkage arm 3 is greater than the total swing angle of the external screwing handle 1. Exemplarily, the total swing angle (the swing angle from the closing position to the opening position) of the external screwing handle 1 is 90°, and two extreme positions of the external screwing handle 1 are in the horizontal and vertical directions, respectively, making the indication more intuitive. The total swing angle of the linkage arm 3 is an obtuse angle. For example, as shown in FIG. 7 of this embodiment, the total swing angle of the linkage arm 3 is 64° + 61° = 125°. To reduce the total swing angle of the external screwing handle 1 to 90°, in this embodiment, the number of teeth of the first gear 21 is set to be less than the number of teeth of the second gear 22. When the linkage arm 3 rotates through a certain angle, the rotation angle of the first gear 21 is greater than that of the second gear 22, thereby reducing the total swing angle of the external screwing handle 1.

[0043] Moreover, when the first gear 21 transmits motion to the second gear 22 with a greater number of teeth, the torque of the second gear 22 is increased, facilitating the rotation of the external screwing handle 1 and avoiding rotation jamming of the external screwing handle 1.

[0044] With reference to FIG. 9 and FIG. 16, the second gear 22 is provided with a first positioning hole 222 and a first fixing hole 223, an end of the external screwing handle 1 close to the second gear 22 is convexly provided with a positioning column 9, and the positioning column 9 is inserted into the first positioning hole 222 to position the mounting position of the second gear 22; the second fixing member 7 passes through the first fixing hole 223 and is connected to the external screwing handle 1.

[0045] With continued reference to FIG. 9, the second gear 22 is coaxially provided with a mounting plate 221, and the mounting plate 221 can provide a reference for the processing positions of the first positioning hole 222 and the first fixing hole 223, ensuring the accuracy of the processing positions.

[0046] To achieve the sliding connection between the rocker arm 4 and the linkage arm 3, in an optional embodiment, with reference to FIG. 5 and FIG. 8, a sliding column 41 is disposed on an end of the rocker arm 4 away from the third rotation center O3, a sliding cavity 33 is disposed on the linkage arm 3, and the sliding column 41 is slidably disposed in the sliding cavity 33. The cooperation of the sliding column 41 and the sliding cavity 33 can guide the sliding between the rocker arm 4 and the linkage arm 3 and prevent the separation between the rocker arm 4 and the linkage arm 3.

[0047] In another alternative embodiment, a sliding sleeve may be rotatably disposed on an end of the rocker arm 4 away from the third rotation center O3 and may be slidably sleeved on the linkage arm 3, which also achieves a sliding connection between the rocker arm 4 and the linkage arm 3.

[0048] With reference to FIG. 5, FIG. 8, and FIG. 10, a transmission hole 42 is disposed on the rocker arm 4. The circuit breaker operating handle 200 includes an arc-shaped swing portion 202 and a swing rod 201, and the swing rod 201 is disposed on the back side of the arc-shaped swing portion 202. The arc-shaped swing portion 202 extends into the interior of the circuit breaker mounting shell 102 and is connected to a four-bar linkage mechanism of the circuit breaker. The swing rod 201 extends outside the circuit breaker mounting shell 102 and is inserted into the transmission hole 42 of the rocker arm 4. When the circuit breaker switches states, the four-bar linkage mechanism drives the arc-shaped swing portion 202 to swing, causing the swing rod 201 to drive the rocker arm 4 to rotate by pushing the wall of the transmission hole 42. A gap is formed between the swing rod 201 and the transmission hole 42, facilitating the insertion of the swing rod 201 into the transmission hole 42 on one hand, and avoiding interfering with the rotation of the rocker arm 4 about the third rotation center O3 on the other hand (if no gap exists between the swing rod 201 and the transmission hole 42, the swing of the swing rod 201 causes the rocker arm 4 to twist).

[0049] In one or more embodiments, with reference to FIG. 5, an elastic member 5 is connected between the housing 100 and the rocker arm 4. The elastic member 5 is connected between the operation mechanism mounting shell 101 and the rocker arm 4, and the wall of the transmission hole 42 abuts against the swing rod 201 under the elastic force of the elastic member 5, preventing the swing rod 201 from shaking in the transmission hole 42. In one or more embodiments, two opposite walls of the transmission hole 42 are each convexly provided with an arc-shaped contact portion 421, and the swing rod 201 abuts against the arc surface of the arc-shaped contact portion 421, driving the rocker arm 4 to rotate by pushing the arc surface of the arc-shaped contact portion 421. The arrangement of the arc-shaped contact portion 421 prevents the swing rod 201 from contacting sharp parts within the transmission hole 42. The elastic member 5 may be a spring.

[0050] As shown in FIG. 5 and FIG. 10, the rocker arm 4 is provided with a hanging lug 43, and a hook at one end of the spring is hooked into a hook hole of the hanging lug 43. The inner wall of the operation mechanism mounting shell 101 is provided with a stepped column 14, and a screw is threaded onto the stepped column 14. A hook slot 15 is formed between the head of the screw and the stepped surface of the stepped column 14, and a hook at the other end of the spring is hooked into the hook slot 15.

[0051] This embodiment also provides a circuit breaker, including a housing 100 and the preceding manual operation mechanism of a circuit breaker. The manual operation mechanism of a circuit breaker is disposed on the housing 100 and linked with the circuit breaker operating handle 200. The closing, tripping, and opening positions of the external screwing handle 1 of the circuit breaker are distinguishable, accurately indicating the current operating state of the circuit breaker.Embodiment two

[0052] With reference to the orientation in FIG. 4, the external screwing handle 1 of an original circuit breaker is in the vertical direction at the closing position and in the horizontal direction at the opening position, and the screwing direction from the opening position to the closing position is clockwise, facilitating user operation. With reference to FIG. 5, if the rocker arm 4 rotates upward to the closing position, the linkage arm 3 and the first gear 21 both rotate counterclockwise, and the second gear 22 drives the external screwing handle 1 to rotate clockwise. With reference to FIG. 4, the external screwing handle 1 needs to be rotated counterclockwise to switch to the closing position. Therefore, with reference to the orientation in FIG. 4, the closing region 11, tripping region 12, and opening region 13 are sequentially arranged in a clockwise direction, requiring counterclockwise rotation from the opening position to the closing position, which is inconsistent with user operation habits. That is, the opposite rotation directions of the linkage arm 3 and the external screwing handle 1 cause the preceding issue.

[0053] Based on the preceding issue and the same inventive concept as embodiment one, as shown in FIG. 11 to FIG. 15, this embodiment provides a manual operation mechanism of a circuit breaker, differing from embodiment one in the following:

[0054] In this embodiment, with reference to FIG. 11 and FIG. 12, the transmission mechanism 2 includes a sector gear 23 and a transmission arm 24. The sector gear 23 is disposed on the linkage arm 3 and rotates coaxially with the linkage arm 3. The transmission arm 24 is connected to the external screwing handle 1 and rotates coaxially with the external screwing handle 1. The transmission arm 24 is provided with an internal gear ring structure 241 meshing with the sector gear 23. When the linkage arm 3 rotates, the sector gear 23 meshes with the internal gear ring structure 241 to drive the transmission arm 24 to rotate, and the transmission arm 24 in turn drives the external screwing handle 1 to rotate. The rotation directions of the linkage arm 3, the transmission arm 24, and the external screwing handle 1 are the same, ensuring that the screwing direction of the external screwing handle 1 from tripping to opening and from tripping to closing is consistent with that of the original circuit breaker, which aligns with user operation habits.

[0055] As shown in FIG. 13A, FIG. 14A, and FIG. 15A, these are schematic diagrams of the manual operation mechanism of a circuit breaker in the closing state, tripping state, and opening state, respectively. When the circuit breaker automatically switches from the closing state to the tripping state and from the tripping state to the opening state, as shown in FIG. 13B, FIG. 14B, and FIG. 15B, the external screwing handle 1 rotates counterclockwise. When a user rotates the external screwing handle 1 to achieve opening or closing, the screwing direction aligns with user operation habits, avoiding misoperation.

[0056] With reference to FIG. 12, a rotary sleeve 34 is convexly disposed on the linkage arm 3 and is coaxially aligned with a mounting hole 31 of the linkage arm 3, and a first fixing member 6 passes through the mounting hole 31 and the rotary sleeve 34 and is connected to the operation mechanism mounting shell 101. The rotary sleeve 34 is rotatably disposed in the housing 100 about the second rotation center O2, and the sector gear 23 is connected to an outer wall of the rotary sleeve 34. The transmission arm 24 is provided with a limiting hole 242 extending along the rotation direction of the transmission arm 24. The rotary sleeve 34 penetrates the limiting hole 242 and is slidably engaged with the limiting hole 242, restricting over-rotation of the transmission arm 24.

[0057] The transmission arm 24 is provided with a second positioning hole 243 and a second fixing hole 244. The second positioning hole 243 engages with a positioning column 9 on the external screwing handle 1 for pre-positioning the installation of the transmission arm 24, and the second fixing member 7 passes through the second fixing hole 244 and is screwed to the external screwing handle 1.

[0058] In one or more embodiments, the transmission arm 24 is provided with a circular thickened protrusion 245, which enhances the strength of the transmission arm 24 on the one hand and facilitates positioning the processing positions of the second positioning hole 243 and the second fixing hole 244 on the other hand.

[0059] In summary, in this application, by adjusting the rotation center of the linkage arm 3 the tripping position of the external screwing handle 1 is adjusted to the midpoint between the closing position and the opening position under the premise of maintaining the total swing angle of the external screwing handle 1 unchanged. That is, when the external screwing handle 1 is in the tripping position, it is located at the middle of the tripping region 12, rather than at the boundary with the closing region 11 so that a user can intuitively determine the current state of the circuit breaker.

[0060] This application provides a manual operation mechanism of a circuit breaker and a circuit breaker including the manual operation mechanism. The rocker arm 4 can be driven to rotate by the circuit breaker operating handle 200. When the rocker arm rotates, it drives the linkage arm to rotate through the sliding connection with the linkage arm, and the linkage arm, via the transmission mechanism, drives the external screwing handle to switch from the closing position to the tripping position, completing the automatic tripping of the circuit breaker. Conversely, when a user manually rotates the external screwing handle, the external screwing handle can drive the linkage arm to rotate via the transmission mechanism, and the linkage arm, via the rocker arm, drives the circuit breaker operating handle to switch to the closing position or the opening position. In an embodiment, the rotation center of the linkage arm is set at the first rotation center (that is, the rotation center of the linkage arm coincides with that of the external screwing handle), the swing angle of the linkage arm when the linkage arm sweeps the preset swing arc is relatively small. In the manual operation mechanism provided in this application, the rotation center of the linkage arm is adjusted to be within the sector region enclosed by the preset swing arc and the first rotation center so that the rotation center of the linkage arm is closer to the preset swing arc, thereby increasing the swing angle of the linkage arm when the linkage arm sweeps the preset swing arc. That is, the swing angle of the linkage arm between the closing position and the tripping position is increased, and the swing angle, mapped to the external screwing handle, enlarges the swing amplitude of the external screwing handle between the closing position and the tripping position, enabling accurate and clear indication of the closing and tripping states of the circuit breaker. A user can intuitively determine the current operating state of the circuit breaker by observing the position of the external screwing handle.

Examples

embodiment one

Embodiment one

[0031]As shown in FIG. 4 and FIG. 5, this embodiment provides a manual operation mechanism of a circuit breaker that is capable of accurately indicating the closing, tripping, and opening states of the circuit breaker, enabling a user to intuitively determine the current operating state of the circuit breaker. The manual operation mechanism of a circuit breaker includes an external screwing handle 1, a transmission mechanism 2, a linkage arm 3, and a rocker arm 4. When the circuit breaker switches between the closing state, tripping state, and opening state, the external screwing handle 1, the transmission mechanism 2, the linkage arm 3, and the rocker arm 4 each have corresponding closing, tripping, and opening positions.

[0032]As shown in FIG. 4 to FIG. 7, the external screwing handle 1 is disposed outside a housing 100 of the circuit breaker and rotatable about a first rotation center O1; the linkage arm 3 is rotatably disposed inside the housing 100 about a second r...

embodiment two

Embodiment two

[0052]With reference to the orientation in FIG. 4, the external screwing handle 1 of an original circuit breaker is in the vertical direction at the closing position and in the horizontal direction at the opening position, and the screwing direction from the opening position to the closing position is clockwise, facilitating user operation. With reference to FIG. 5, if the rocker arm 4 rotates upward to the closing position, the linkage arm 3 and the first gear 21 both rotate counterclockwise, and the second gear 22 drives the external screwing handle 1 to rotate clockwise. With reference to FIG. 4, the external screwing handle 1 needs to be rotated counterclockwise to switch to the closing position. Therefore, with reference to the orientation in FIG. 4, the closing region 11, tripping region 12, and opening region 13 are sequentially arranged in a clockwise direction, requiring counterclockwise rotation from the opening position to the closing position, which is inco...

Claims

1. A manual operation mechanism of a circuit breaker, comprising an external screwing handle (1), a transmission mechanism (2), a linkage arm (3), and a rocker arm (4); wherein the external screwing handle (1) is disposed outside a housing (100) of the circuit breaker and is rotatable about a first rotation center; the linkage arm (3) is disposed inside the housing (100), is rotatable about a second rotation center and is drivingly connected to the external screwing handle (1) via the transmission mechanism (2); one end of the rocker arm (4) is disposed inside the housing (100) and is rotatable about a third rotation center, and another end of the rocker arm (4) is slidably connected to the linkage arm (3); the third rotation center, the second rotation center and the first rotation center are not coincident with each other; and an end of the linkage arm (3) away from the second rotation center is configured to swing along a preset swing arc (1000) between a closing position and a tripping position, and the second rotation center is located in a sector region enclosed by the preset swing arc (1000) and the first rotation center.

2. The manual operation mechanism according to claim 1, wherein the transmission mechanism (2) comprises: a first gear (21) disposed on the linkage arm (3) and configured to rotate coaxially with the linkage arm (3); and a second gear (22) meshing with the first gear (21), wherein the second gear (22) is connected to the external screwing handle (1) and configured to rotate coaxially with the external screwing handle (1).

3. The manual operation mechanism according to claim 2, wherein a total swing angle of the linkage arm (3) is greater than a total swing angle of the external screwing handle (1), and a number of teeth of the first gear (21) is less than a number of teeth of the second gear (22).

4. The manual operation mechanism according to claim 1, wherein the transmission mechanism (2) comprises: a sector gear (23) disposed on the linkage arm (3) and configured to rotate coaxially with the linkage arm (3); and a transmission arm (24) connected to and configured to rotate coaxially with the external screwing handle (1), wherein the transmission arm (24) is provided with an internal gear ring structure (241) meshing with the sector gear (23).

5. The manual operation mechanism according to claim 4, wherein a rotary sleeve (34) is convexly disposed on the linkage arm (3), is disposed inside the housing (100) and is rotatable about the second rotation center, and the sector gear (23) is connected to an outer wall of the rotary sleeve (34); and the transmission arm (24) is provided with a limiting hole (242) extending along a rotation direction of the transmission arm (24), and the rotary sleeve (34) penetrates the limiting hole (242) and is slidably engaged with the limiting hole (242).

6. The manual operation mechanism according to any one of claims 1 to 5, wherein a difference between a swing angle of the linkage arm (3) between the closing position and the tripping position and a swing angle of the linkage arm (3) between the tripping position and an opening position is ±5°.

7. The manual operation mechanism according to any one of claims 1 to 5, wherein a sliding column (41) is disposed on an end of the rocker arm (4) away from the third rotation center, a sliding cavity (33) is disposed on the linkage arm (3), and the sliding column (41) is slidably disposed in the sliding cavity (33); or a sliding sleeve is rotatably disposed on an end of the rocker arm (4) away from the third rotation center and is slidably sleeved on the linkage arm (3).

8. The manual operation mechanism according to any one of claims 1 to 5, wherein a transmission hole (42) is disposed on the rocker arm (4) and is configured for a swing rod (201) of a circuit breaker operating handle (200) to insert into, the swing rod (201) drives the rocker arm (4) to rotate by pushing a wall of the transmission hole (42), and a gap is formed between the swing rod (201) and the transmission hole (42).

9. The manual operation mechanism according to claim 8, wherein an elastic member (5) is connected between the housing (100) and the rocker arm (4), and the wall of the transmission hole (42) abuts against the swing rod (201) under an elastic force of the elastic member (5).

10. The manual operation mechanism according to claim 9, wherein two opposite walls of the transmission hole (42) are each convexly provided with an arc-shaped contact portion (421), and the swing rod (201) abuts against an arc surface of the arc-shaped contact portion (421).

11. A circuit breaker, comprising a housing (100) and the manual operation mechanism of a circuit breaker according to any one of claims 1 to 10, wherein the manual operation mechanism of a circuit breaker is disposed on the housing (100).

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