A locking structure of a circuit breaker operating mechanism

Abstract

The application relates to a locking structure of a circuit breaker operating mechanism, which comprises a support, a handle lever assembly, a lock catch assembly and a connecting rod mechanism; the handle lever assembly and the lock catch assembly are rotatably arranged on the support, the lock catch assembly is in snap-fit cooperation with the connecting rod mechanism and is used for locking or unlocking the connecting rod mechanism, the handle lever assembly drives the connecting rod mechanism to move to realize the closing and opening of the circuit breaker, and the operating mechanism further comprises a transmission mechanism which is driven by the handle lever assembly and is converted between a first position and a second position; when the handle lever assembly is in the closing or tripping position, the transmission mechanism is in the first position, the transmission mechanism is separated from the lock catch assembly, and the operating mechanism can be tripped; when the handle lever assembly is in the opening position, the transmission mechanism is in the second position, the transmission mechanism acts on the lock catch assembly to make the lock catch assembly remain in the locking position, and the operating mechanism cannot be tripped. The application has the advantages of reasonably reducing the complexity of operation, realizing the unlocking of the operating mechanism in the opening state, keeping the circuit breaker in the snap-fit state and preventing tripping.

Description

Technical Field

[0001] This invention belongs to the field of low-voltage electrical appliance technology, and specifically relates to a locking structure for a circuit breaker operating mechanism. Background Technology

[0002] A typical example of a circuit breaker is the molded case circuit breaker, but it is not limited to molded case circuit breakers. They achieve the purpose of controlling and protecting circuits by closing, opening, and tripping the power supply. The aforementioned closing, opening, and tripping are essentially achieved through the circuit breaker's operating mechanism. Specifically, the circuit breaker trips by unlocking the operating mechanism when the circuit is closed.

[0003] The line is disconnected to protect it.

[0004] As is known in the industry, whether it is an overload or short-circuit trip unit, or a shunt or undervoltage trip unit, they all rely on unlocking the latch of the operating mechanism. Figure 12 The locking part 181 in the middle unlocks the operating mechanism; see details below. Figures 11 to 13The operating mechanism 1 includes a bracket 11, a handle lever assembly 12 rotatably mounted on the bracket 11, a trip lever 13, a first locking member 14, an upper connecting rod 15, a lower connecting rod 16, a second locking member 17, and a traction rod 18. The traction rod 18 and the second locking member 17 are engaged. The second locking member 17 abuts against the first locking member 14 through a second locking member bearing 171. The first locking member 14 and the trip lever 13 are engaged to lock or unlock the trip lever 13. The upper connecting rod 15 and the lower connecting rod 16 are hinged to each other. The upper connecting rod 15 is rotatably connected to the trip lever 13. The lower connecting rod 16 is connected to the rotating shaft 3 that drives the moving contact to rotate and realize the opening and closing of the circuit breaker. In the existing circuit breaker operating mechanism, when the circuit breaker is in the open state, the trip lever 13 is in the latched state. The latching part 131 of the trip lever 13 engages with the latching surface 141 of the first locking member 14. Under the action of the main tension spring of the operating mechanism 1, the trip lever 13 tends to rotate clockwise. Under the reaction force applied by the first locking member 14, the trip lever 13 remains in a balanced and stationary state. The second locking member bearing 171 mounted on the second locking member 17 of the locking assembly abuts against the upper back side 142 of the first locking member 14. Under the force of the trip lever 13, the first locking member 14 tends to rotate counterclockwise. Under the reaction force applied by the second locking member 17, the first locking member 14 remains in a balanced and stationary state. With the traction rod 18 in the reset state, the locking plate 172 of the aforementioned second locking member 17 abuts against the locking part 181 of the traction rod 18. Under the force of the first locking member 14, the second locking member 17 tends to rotate clockwise. Under the reaction force applied by the traction rod 18, the second locking member 17 remains in a balanced and static state. In this state, rotating the traction rod 18 unlocks the operating mechanism 1. The traction rod 18 rotates clockwise, the locking plate 172 of the second locking member 17 disengages from the locking part 181 of the traction rod 18, the reaction force of the traction rod 18 disappears, the balance between the second locking member 17 and the first locking member 14 is broken, the first locking member 14 rotates counterclockwise, the latch part 131 on the jump lever 13 disengages from the latch surface 141 of the first locking member 14, the jump lever 13 rotates clockwise, and the operating mechanism is unlocked and disengaged.

[0005] However, in many cases, there is a requirement that the operating mechanism should not unlock when the circuit breaker is in the open state or when the undervoltage release is de-energized or undervoltage occurs. The reason for this can be explained as follows: Before the generator stops, the electric operating mechanism issues a trip command to trip the circuit breaker (disconnect the load). When the generator stops, the undervoltage release is de-energized, and the operating mechanism's traction rod unlocks. From the perspective of electrical operation characteristics, when the circuit breaker is in the tripped state, the trip button must be pressed first, and only after tripping can the closing button be pressed to close the circuit. The existing system's closing operation is complex and time-consuming.

[0006] In view of the aforementioned existing technology, it is necessary to make reasonable improvements to the operating mechanism of the existing circuit breaker. To this end, the applicant has made a beneficial design, and the technical solution described below is the result of this design. Summary of the Invention

[0007] The objective of this invention is to provide a locking structure for a circuit breaker operating mechanism, which reasonably reduces the complexity of the system closing operation and ensures that the operating mechanism remains in the latched state when the undervoltage strikes the traction rod in the open state, without disengaging.

[0008] The present invention achieves its objective by providing a locking structure for a circuit breaker operating mechanism. The operating mechanism includes a bracket, a handle lever assembly, a latching assembly, and a linkage mechanism. The handle lever assembly and the latching assembly are rotatably mounted on the bracket. The latching assembly engages with the linkage mechanism to lock or unlock the linkage mechanism. The rotation of the handle lever assembly drives the linkage mechanism to achieve the closing and opening of the circuit breaker. The operating mechanism further includes a transmission mechanism driven by the handle lever assembly and switching between a first position and a second position. When the handle lever assembly is in the closed or tripped position, the transmission mechanism is in the first position, separating from the latching assembly, allowing the operating mechanism to trip. When the handle lever assembly is in the tripped position, the transmission mechanism is in the second position, acting on the latching assembly to hold it in the locked position, preventing the operating mechanism from tripping.

[0009] In a specific embodiment of the present invention, the transmission mechanism is a rigid component, including a first transmission member and a second transmission member that rotates with the first transmission member. The handle lever assembly drives the second transmission member to rotate, thereby causing the first transmission member to rotate and abut against the locking assembly.

[0010] In another specific embodiment of the present invention, the first transmission member is provided with a first mounting portion, and the second transmission member is provided with a second mounting portion concentric with the first mounting portion. The transmission mechanism is mounted on the operating mechanism via the first mounting portion and the second mounting portion.

[0011] In another specific embodiment of the present invention, the handle lever assembly includes an operating handle, the operating handle is provided with a driving part, the second transmission member is provided with a pressing part, and the driving part contacts the pressing part to drive the transmission mechanism to move.

[0012] In another specific embodiment of the present invention, the locking assembly includes a first locking member, a second locking member, and a traction rod. The traction rod is fastened to the second locking member, and the second locking member abuts against the first locking member through a second locking member bearing disposed thereon.

[0013] In another specific embodiment of the present invention, the second locking member has a bent portion, the first transmission member has a first connecting portion, and the first connecting portion abuts against the bent portion of the second locking member.

[0014] In a further specific embodiment of the present invention, the linkage mechanism includes an upper linkage and a lower linkage that are hinged to each other, and a trip lever that is rotatably mounted on a bracket; the first locking element and the trip lever are fastened together to lock or unlock the trip lever; the upper linkage is rotatably connected to the trip lever; and the lower linkage is connected to the shaft that drives the moving contact to rotate and realize the opening and closing of the circuit breaker.

[0015] In a further specific embodiment of the present invention, the transmission mechanism is an elastic component, the elastic component is a torsion spring, the torsion spring includes a helically arranged spring body, and the two ends of the spring body are respectively formed with a first torsion arm and a second torsion arm. The spring body is rotatably mounted on the bracket. When the transmission mechanism is in the second position, the first torsion arm abuts against the handle lever assembly, and the second torsion arm abuts against the second locking member.

[0016] The present invention, due to the above-mentioned structure, has the following beneficial effects: When the operating mechanism is in the open state, the operating handle is in the open position, that is, the transmission mechanism is in the second position. When the trip lever engages with the first locking member, the driving part on the operating handle abuts against the pressing part on the second transmission member. The transmission mechanism applies an auxiliary force to the second locking member, causing the second locking member to have a counterclockwise rotation tendency. Under the auxiliary force of the first locking member and the transmission mechanism, the second locking member continues to remain balanced and stationary. At this time, pushing the traction rod does not unlock or trip, and the operating mechanism remains in the latched state. This achieves the requirement that the operating mechanism does not unlock when the circuit breaker is in the open state or when the undervoltage trip unit loses power or is undervoltage. This structure only requires the operating handle to be in the open position, which reasonably reduces the complexity of system operation. It ensures that when the circuit breaker is in the open state, the circuit breaker remains in the latched state and does not trip when the undervoltage trip unit strikes the traction rod, thus ensuring the safety of the circuit breaker. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the transmission mechanism of the operating mechanism described in this invention when the operating mechanism is closed.

[0018] Figure 2 This is a schematic diagram of the transmission mechanism of the operating mechanism described in this invention when the operating mechanism is tripped.

[0019] Figure 3 This is a schematic diagram of the operating mechanism of the present invention performing a re-fastening operation in a disengaged state.

[0020] Figure 4 This is an exploded view of the assembly of the operating mechanism described in this invention.

[0021] Figure 5 This is a cross-sectional view of the operating mechanism of the present invention in the open position.

[0022] Figure 6 This is a schematic diagram of the assembly of the second locking element and the transmission mechanism of the operating mechanism described in this invention.

[0023] Figure 7 This is a schematic diagram showing the cooperation between the second locking element and the traction rod when the operating mechanism of the present invention is in the open position.

[0024] Figure 8 This is a schematic diagram of the structure of the first transmission component in an embodiment of the transmission mechanism described in this invention.

[0025] Figure 9 This is a schematic diagram of the structure of the second transmission component in an embodiment of the transmission mechanism described in this invention.

[0026] Figure 10 This is a schematic diagram of the assembly structure of another embodiment of the transmission mechanism described in this invention.

[0027] Figure 11 This is an assembly diagram of the existing operating mechanism.

[0028] Figure 12 A schematic diagram showing the interaction between the second locking element and the traction rod when the existing operating mechanism is in the open position.

[0029] Figure 13 This is a cross-sectional view of the operating mechanism in the open position as described in the prior art.

[0030] In the diagram: 1. Operating mechanism; 11. Bracket; 12. Handle lever assembly; 121. Handle lever; 122. Operating handle; 1221. Drive unit; 13. Jumper lever; 131. Hook and latch part; 14. First locking element; 141. Hook and latch surface; 142. Upper back part; 15. Upper connecting rod; 16. Lower connecting rod; 17. Second locking element; 171. Second locking element bearing; 172. Locking plate; 173. Bending part; 18. Traction rod; 181. Locking part; 19. Upper and lower connecting rod hinge. 1. Connecting shaft; 2. Transmission mechanism; 21. First transmission component; 211. First mounting part; 212. First connecting part; 2121. Upper end face; 2122. Lower end face; 22. Second transmission component; 221. Second mounting part; 222. Second connecting part; 223. Pressing part; 20. Torsion spring; 20a. Spring body; 20b. First torsion arm; 20c. Second torsion arm; 3. Rotating shaft; 4. Moving contact; 5. Stationary contact; 6. Base; 7. Pivoting shaft; 8. Traction rod hinge shaft; 10. Torsion spring. Detailed Implementation

[0031] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of the present invention should be considered within the scope of protection of the present invention.

[0032] In the following description, all directional or orientational concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this invention.

[0033] Please see Figures 1 to 3 This invention relates to a locking structure for a circuit breaker operating mechanism. The specific structure of the circuit breaker is not shown in the figures, but it is well-known to those skilled in the art. The circuit breaker specifically includes: an operating mechanism 1, a base 6, a rotating shaft 3, and a contact system consisting of a moving contact 4 and a stationary contact 5. The operating mechanism 1 is installed within the base 6, and a handle lever assembly 12 is mounted on the operating mechanism 1. When the operating mechanism 1 switches between closing and opening, the handle lever assembly 12 drives the operating mechanism 1 to move. The movement of the operating mechanism 1 then drives the rotating shaft 3 to move, causing the moving contact 4 to rotate and achieve contact or separation with the stationary contact 5.

[0034] The aforementioned operating mechanism 1 includes open, close, trip, and re-trip states. The trip state refers to the operating mechanism 1 encountering a fault current during operation, causing the circuit breaker's trip unit (not shown in the figure) to operate with a long delay or instantaneous action. The actuator on the trip unit (not shown in the figure) drives the operating mechanism 1 to move, and the aforementioned first locking member 14 unlocks the trip lever 13, causing the operating mechanism 1 to trip. In the trip state, in order for the operating mechanism 1 to re-enter the closeable state, it is necessary to operate the circuit breaker handle lever assembly 12 to cause the operating mechanism 1 to perform a re-trip action and enter the re-trip state.

[0035] Please see Figure 4 And combined Figures 1 to 3 The aforementioned operating mechanism 1 includes a bracket 11, a handle lever assembly 12, a locking assembly, a linkage mechanism, and a transmission mechanism 2. The operating mechanism 1 is fixed to the circuit breaker base 6 via the bracket 11. The handle lever assembly 12 is rotatably mounted on the bracket 11. The locking assembly, linkage mechanism, and transmission mechanism 2 are rotatably mounted on the aforementioned bracket 11.

[0036] The key technical points of the technical solution provided by the present invention are as follows: the aforementioned transmission mechanism 2 is driven by the handle lever assembly 12 and switches between a first position and a second position. When the handle lever assembly 12 is in the closed or released position, the transmission mechanism 2 is in the first position, the transmission mechanism 2 and the locking assembly are separated, and the operating mechanism 1 can be released; when the handle lever assembly 12 is in the open position, the transmission mechanism 2 is in the second position, the transmission mechanism 2 acts on the locking assembly to keep it in the locked position, and the operating mechanism 1 cannot be released.

[0037] like Figures 4 to 6 As shown, the operating mechanism 1 includes a bracket 11, a handle lever assembly 12, a jump-lock lever 13, a first locking element 14, an upper connecting rod 15, a lower connecting rod 16, a second locking element 17, a traction rod 18, and a torsion spring 10. The handle lever assembly 12 is rotatably mounted on the bracket 11. The first locking element 14 and the jump-lock lever 13 are rotatably mounted on the bracket 11. The traction rod 18 and the second locking element 17 are rotatably mounted on the bracket 11. The torsion spring 10 is sleeved on the bracket 11, with one end hooked onto the bracket 11 and the other end abutting against the second locking element 17, providing a restoring force to the second locking element 17. The traction rod 18 and the second locking element 17 engage in a latching cooperation for locking or unlocking. A second locking fastener 17 is engaged with the first locking fastener 14 to lock or unlock the first locking fastener 14. The first locking fastener 14 and the trip lever 13 are engaged to lock or unlock the trip lever 13. The upper connecting rod 15 is rotatably connected to the trip lever 13. The upper connecting rod 15 and the lower connecting rod 16 are hinged together by an upper and lower connecting rod hinge shaft 19. The lower connecting rod 16 is connected to the rotating shaft 3 of the circuit breaker, which drives the moving contact 4 to rotate and realize the circuit breaker's opening and closing. In this embodiment, the linkage mechanism includes the aforementioned hinged upper connecting rod 15 and lower connecting rod 16, and the trip lever 13 rotatably mounted on the bracket 11; the locking assembly includes the aforementioned first locking fastener 14, second locking fastener 17, and traction rod 18.

[0038] like Figure 4 As shown, the operating mechanism 1 also includes a pivot shaft 7, which is mounted on the bracket 11. The second locking member 17 is hinged to the pivot shaft 7, and the torsion spring 10 is sleeved on the pivot shaft 7, with one end hooked to the bracket 11 and the other end abutting against the second locking member 17. The transmission mechanism 2 is rotatably mounted on the pivot shaft 7, that is, the transmission mechanism 2 is rotatably mounted on the bracket 11 and located on one side of the second locking member 17. When the operating mechanism 1 moves to the open position, as... Figure 2In the open position shown, the handle lever assembly 12 pushes the transmission mechanism 2 to rotate. When the operating mechanism 1 moves to the open position, the handle lever assembly 12 drives the transmission mechanism 2 to the second position. The transmission mechanism 2 abuts against the second locking member 17 to keep the locking assembly in the locked position. At this time, if the traction rod 18 is actuated to unlock the operating mechanism 1, the operating mechanism 1 will not disengage.

[0039] like Figure 4 As shown, the aforementioned handle lever assembly 12 includes a handle lever 121 and an operating handle 122 mounted on the handle lever 121. The operating handle 122 drives the handle lever 121 to rotate, thereby driving the operating mechanism 1 to move and realize the closing and opening of the circuit breaker. At the same time as the handle lever 121 rotates, it drives the trip lever 13 to rotate counterclockwise.

[0040] like Figure 5 As shown, the aforementioned first locking member 14 has a latching surface 141, and the aforementioned jump lever 13 has a latching portion 131. The latching surface 141 and the latching portion 131 engage to lock the jump lever 13. The aforementioned operating mechanism 1 also includes a traction rod hinge shaft 8. The aforementioned traction rod 18 is hinged to the bracket 11 via the traction rod hinge shaft 8, so that the aforementioned traction rod 18 rotates about the traction rod hinge shaft 8 as the rotation center.

[0041] like Figures 5 to 7 As shown, the second locking member 17 has a locking plate 172, and the traction rod 18 has a locking part 181. The locking plate 172 and the locking part 181 engage in a latching cooperation to lock or unlock the traction rod 18 onto the second locking member 17. A second locking member bearing 171 is installed on the second locking member 17. When the operating mechanism 1 is in the latched state, such as... Figure 5 , Figure 6 As shown, the torsion spring 10 provides a restoring force to the second locking member 17. The second locking member 17 is in contact with the first locking member 14, that is, the bearing 171 of the second locking member and the upper back surface 142 of the first locking member 14 form a rolling pair. In other words, the bearing 171 of the second locking member and the upper back surface 142 of the first locking member 14 roll into each other. Under the action force applied by the first locking member 14 and the reaction force applied by the traction rod 18, the second locking member 17 remains in balance. When the traction rod 18 is rotated, the locking plate 172 of the second locking member 17 disengages from the locking part 181 of the traction rod 18, the reaction force of the traction rod 18 disappears, the balance between the second locking member 17 and the first locking member 14 is broken, and the second locking member 17 is unlocked.

[0042] The aforementioned operating mechanism 1 employs a two-stage locking structure where the second locking element 17 engages with the first locking element 14, and the first locking element 14 engages with the jump lever 13 to lock or unlock the operating mechanism 1. Alternatively, the operating mechanism 1 can also employ a single-stage locking structure, where the traction rod 18 directly engages with the first locking element 14, and the first locking element 14 engages with the jump lever 13 to lock or unlock the operating mechanism 1.

[0043] like Figure 4 , Figure 6 , Figure 8 As shown, the aforementioned second locking member 17 also has a bent portion 173 opposite to the traction direction. The aforementioned transmission mechanism 2 is a rigid component, including a first transmission member 21. An upper end face 2121 is provided on the first connecting portion 212 of the first transmission member 21. The first transmission member 21 is sleeved on the pivot shaft 7 through a first mounting portion 211 provided thereon, and its upper end face 2121 abuts against the bent portion 173.

[0044] like Figures 4 to 9 As shown, the aforementioned operating handle 122 is provided with a driving part 1221, and the aforementioned transmission mechanism 2 includes a second transmission member 22 that is connected and cooperates with the first transmission member 21. A pressing part 223 is provided on the second transmission member 22. The second transmission member 22 is sleeved on the pivot shaft 7 through a second mounting part 221 provided thereon. The lower end face 2122 of the first transmission member 21 cooperates with a second connecting part 222 that protrudes from the second transmission member 22. When the operating handle 122 is pushed to the open position, the driving part 1221 abuts against the pressing part 223 and drives the second transmission member 22 to rotate. The second connecting part 222 on the second transmission member 22 abuts against the lower end face 2122 of the first transmission member 21 and drives the first transmission member 21 to rotate. At this time, the upper end face 2121 on the first connecting part 212 of the first transmission member 21 abuts against the bent part 173 on the second locking member 17 and drives the second locking member 17 to rotate counterclockwise. At this time, the transmission mechanism 2 changes from the first position to the second position. At this time, the locking plate 172 is either locked or separated from the locking part 181.

[0045] The above-mentioned transmission mechanism 2 adopts a technical solution that combines the first transmission component 21 and the second transmission component 22. At the same time, the transmission mechanism 2 can also adopt a technical solution that integrates the first transmission component 21 and the second transmission component 22.

[0046] Please see Figure 10In another embodiment of the present invention, the transmission mechanism 2 is a spring component, and the elastic component is a torsion spring 20. The torsion spring 20 includes a helically arranged spring body 20a. The two ends of the spring body 20a are respectively formed with a first torsion arm 20b and a second torsion arm 20c. The spring body 20a is sleeved on the pivot shaft 7 and located on one side of the second locking member 17. When the operating handle 122 is pushed to the open position, the first torsion arm 20b abuts against the driving part 1221, and the second torsion arm 20c abuts against the bending part 173. Under the action of the torsion spring force, the second locking member 17 rotates counterclockwise, and the locking plate 172 is either locked or separated from the locking part 181.

[0047] Please see Figure 4 , Figure 5 and combined Figure 1 This invention adds a transmission mechanism 2 to the existing operating mechanism. The operating mechanism 1 performs the unlocking operation in the closed state, see [link to relevant documentation]. Figure 1 With the handle lever 12 in the closed position, the moving contact 3 contacts the stationary contact 4 under the action of the main spring force. The latching part 131 of the aforementioned jump lever 13 overlaps with the latching surface 141 on the first locking member 14. Under the action of the main spring force of the operating mechanism 1, the jump lever 13 tends to rotate clockwise. Under the reaction force applied by the first locking member 14, the jump lever 13 remains in a balanced and stationary state. The second locking member bearing 171 installed on the aforementioned second locking member 17 abuts against the upper back side 142 of the first locking member 14. Under the force of the jump lever 13, the first locking member 14 tends to rotate counterclockwise. Under the reaction force applied by the second locking member 17, the first locking member 14 remains in a balanced and stationary state. The aforementioned traction rod 18 is in the reset state, and the locking plate 172 of the aforementioned second locking member 17 abuts against the locking part 181 of the traction rod 18. Under the action of the first locking member 14, the second locking member 17 tends to rotate clockwise. Under the reaction force applied by the traction rod 18, the second locking member 17 remains in a balanced and static state.

[0048] The trigger lever 18 unlocks the operating mechanism 1. The lever 18 rotates clockwise, and the locking plate 172 of the second locking member 17 disengages from the locking part 181 of the lever 18. The reaction force of the lever 18 disappears, and the balance between the second locking member 17 and the first locking member 14 is broken. The first locking member 14 rotates counterclockwise, and the latch part 131 on the jump lever 13 disengages from the latch surface 141 of the first locking member 14. The jump lever 13 rotates clockwise, and the operating mechanism 1 is unlocked and disengaged, that is, the transmission mechanism 2 is in the first position.

[0049] Please continue reading Figure 4 , Figure 5 and combined Figure 3 Operating mechanism 1 performs a re-engagement operation while in the disengaged state, see [link / reference]. Figure 3 Rotating the circuit breaker's operating handle 122 causes the handle lever 121 to rotate, which in turn causes the trip lever 13 to rotate counterclockwise. The latching part 131 of the trip lever 13 moves downward and contacts the latching surface 141 on the first locking member 14, causing the first locking member 14 to rotate counterclockwise. At the same time, the second locking member 17 rotates clockwise under the action of the torsion spring 10 until the latching part 131 of the trip lever 13 latches with the latching surface 141 of the first locking member 14. Under the action of the main spring force, the trip lever 13 tends to rotate clockwise. Under the reaction force applied by the first locking member 14, the trip lever 13 remains in a balanced and static state. The second locking member bearing 171 installed on the aforementioned second locking member 17 abuts against the upper back side 142 of the first locking member 14. Under the action of the jump lever 13, the first locking member 14 tends to rotate counterclockwise. Under the reaction force applied by the second locking member 17, the first locking member 14 remains in a balanced and static state.

[0050] At this time, the driving part 1221 on the aforementioned operating handle 122 abuts against the pressing part 223 on the second transmission member 22, and drives the second transmission member 22 to rotate. The second transmission member 22 is provided with a second connecting part 222, which is attached to the lower end face 2122 of the first transmission member 21 and drives the first transmission member 21 to rotate. At this time, the upper end face 2121 on the first transmission member 21 abuts against the bent part 173 on the second locking member 17 and drives the second locking member 17 to rotate counterclockwise. At this time, the locking plate 172 is either locked or separated from the locking part 181. The operating mechanism 1 completes the re-locking operation, and the operating mechanism 1, i.e., the transmission mechanism 2, is in the second position. Preferably, the driving part 1221 has an arc surface structure. When the operating mechanism 1 moves from the open position to the re-locking position, the transmission mechanism 2 remains in the second position.

[0051] Please continue reading Figure 4 , Figure 5 and combined Figure 2 Operating mechanism 1 performs the unlocking operation while the circuit breaker is in the open state. See [link / reference]. Figure 2With the operating handle 122 in the open position, the moving contact 4 disengages from the stationary contact 5 under the force of the main spring, returning to the open state. The aforementioned trip lever 13 is in the latched state, with the latching part 131 of the trip lever 13 engaging with the latching surface 141 of the first locking member 14. Under the force of the main tension spring, the trip lever 13 tends to rotate clockwise. Under the reaction force applied by the first locking member 14, the trip lever 13 remains in a balanced and stationary state. The second locking member bearing 171 mounted on the aforementioned second locking member 17 abuts against the upper back surface 142 of the first locking member 14. Under the action of the trip lever 13, the first locking member 14 tends to rotate counterclockwise. Under the reaction force applied by the second locking member 17, the first locking member 14 remains in a balanced and stationary state. The aforementioned traction rod 18 is in the reset state, and the aforementioned second locking member 17 abuts against the traction rod 18. The locking plate 172 is either latched or separated from the locking part 181. If the traction rod 18 is pushed to unlock at this time, the driving part 1221 on the operating handle 122 continues to abut against the pressing part 223 on the second transmission member 22. The transmission mechanism 2 applies an auxiliary force to the second locking member 17, causing the second locking member 17 to have a counterclockwise rotation tendency. The second locking member 17 continues to remain balanced and stationary under the auxiliary force of the first locking member 14 and the transmission mechanism 2. The operating mechanism remains in the latched state, and pushing the traction rod 18 does not unlock or release the trip. This achieves the requirement that the operating mechanism does not unlock when the circuit breaker is in the open state and when the undervoltage trip device loses power or is undervoltage. This structure only requires the operating handle 122 to be in the open position, which reduces the complexity of system operation to a certain extent.

Claims

1. A locking structure for a circuit breaker operating mechanism, wherein the operating mechanism (1) includes a bracket (11), a handle lever assembly (12), a latch assembly, and a linkage mechanism; the handle lever assembly (12) and the latch assembly are rotatably mounted on the bracket (11), the latch assembly engages with the linkage mechanism to lock or unlock the linkage mechanism, and the rotation of the handle lever assembly (12) drives the linkage mechanism to move to realize the closing and opening of the circuit breaker, characterized in that: The operating mechanism (1) further includes a transmission mechanism (2), which is driven by the handle lever assembly (12) and switches between a first position and a second position. When the handle lever assembly (12) is in the closed or released position, the transmission mechanism (2) is in the first position, the transmission mechanism (2) and the locking assembly are separated, and the operating mechanism (1) can be released. When the handle lever assembly (12) is in the open position, the transmission mechanism (2) is in the second position, the transmission mechanism (2) acts on the locking assembly to keep it in the locked position, and the operating mechanism (1) cannot be released.

2. The locking structure of a circuit breaker operating mechanism according to claim 1, characterized in that: The transmission mechanism (2) is a rigid component, including a first transmission component (21) and a second transmission component (22) that rotates with the first transmission component (21). The handle lever assembly (12) drives the second transmission component (22) to rotate, thereby causing the first transmission component (21) to rotate and abut against the locking assembly.

3. The locking structure of a circuit breaker operating mechanism according to claim 2, characterized in that: The first transmission member (21) has a first mounting portion (211), and the second transmission member (22) has a second mounting portion (221) concentric with the first mounting portion (211). The transmission mechanism (2) is mounted on the operating mechanism (1) through the first mounting portion (211) and the second mounting portion (221).

4. The locking structure of a circuit breaker operating mechanism according to claim 3, characterized in that: The handle lever assembly (12) includes an operating handle (122), on which a driving part (1221) is provided, and on the second transmission member (22) a pressing part (223) is provided. The driving part (1221) contacts the pressing part (223) to drive the transmission mechanism (2) to move.

5. The locking structure of a circuit breaker operating mechanism according to claim 2, characterized in that: The locking assembly includes a first locking member (14), a second locking member (17), and a traction rod (18). The traction rod (18) is fastened to the second locking member (17), and the second locking member (17) abuts against the first locking member (14) through a second locking member bearing (171) disposed thereon.

6. The locking structure of a circuit breaker operating mechanism according to claim 5, characterized in that: The second locking member (17) has a bent portion (173), and the first transmission member (21) has a first connecting portion (212). The first connecting portion (212) abuts against the bent portion (173) of the second locking member (17).

7. The locking structure of a circuit breaker operating mechanism according to claim 5, characterized in that: The linkage mechanism includes an upper linkage (15) and a lower linkage (16) that are hinged to each other, and a trip lever (13) that is rotatably mounted on a bracket (11); the first locking member (14) and the trip lever (13) are fastened together to lock or unlock the trip lever (13); the upper linkage (15) is rotatably connected to the trip lever (13); and the lower linkage (16) is connected to the rotating shaft (3) that drives the moving contact to rotate to realize the opening and closing of the circuit breaker.

8. The locking structure of a circuit breaker operating mechanism according to claim 1, characterized in that: The transmission mechanism (2) is an elastic component, which is a torsion spring (20). The torsion spring (20) includes a spirally arranged spring body (20a). The two ends of the spring body (20a) are respectively formed by a first torsion arm (20b) and a second torsion arm (20c). The spring body (20a) is rotatably mounted on the bracket (11). When the transmission mechanism (2) is in the second position, the first torsion arm (20b) abuts against the handle lever assembly (12), and the second torsion arm (20c) abuts against the second locking member (17).

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