circuit breaker

Abstract

A kind of circuit breaker, including operating mechanism and contact system, operating mechanism adds locking mechanism, it is by interlock, elastic piece driven locking assembly and the unlocking piece linked with opening half shaft, interlock is fixed to main shaft, when closing, elastic piece drives locking assembly to insert the locking space between interlock and base side plate, locking main shaft to provide rigid support, inhibit contact back-off;When opening, opening half shaft triggers tripping and unlocking component synchronously, release locking, can effectively improve short-time withstand current capacity, simplify assembly process, and significantly improve product reliability and service life.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, and more specifically to a circuit breaker. Background Technology

[0002] Circuit breakers and disconnect switches are the most important electrical equipment in power distribution systems and new energy systems. With the continuous increase in system voltage, the performance requirements for circuit protection switches are also getting higher and higher. Miniaturization, high performance, modularization, and high reliability are the main development directions of air circuit breakers and disconnect switches at present.

[0003] With the development of the power industry, the capacity of DC inverter cabinets is gradually increasing, and the requirements for the short-term withstand capability of DC products are also constantly increasing. Current mainstream products generally exhibit contact retraction when subjected to short-term high-current impacts: when a product is subjected to a short-term high-current withstand capability, the electrodynamic repulsion force can cause the contacts to retract, reducing the final contact pressure, which in turn leads to a surge in contact resistance, resulting in a decrease in the short-term withstand current that can be withstood. Under long-term chain reactions, it falls into a vicious cycle of "contact retraction, contact deterioration, decreased withstand capability, and even higher retraction". If this vicious cycle cannot be broken, it will be difficult to improve the product's withstand capability. Summary of the Invention

[0004] The purpose of this invention is to overcome at least one defect of the prior art and provide a circuit breaker.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A circuit breaker includes an operating mechanism and a contact system. The operating mechanism includes a main shaft rotatable between a closed position and an open position. The contact system includes a moving contact and a stationary contact. The main shaft is connected to the moving contact. The circuit breaker is characterized in that...

[0007] The operating mechanism further includes a locking mechanism, the locking mechanism comprising:

[0008] The interlocking component is fixedly mounted on the main shaft and can rotate with the main shaft between the closed and open positions;

[0009] The locking component, driven by the elastic element, locks the interlocking element that rotates with the main shaft to the closed position, preventing the main shaft from rotating to the open position.

[0010] The unlocking component is linked to the operating mechanism. When the circuit breaker is opened, the operating mechanism unlocks the interlocking component by driving the locking component.

[0011] Preferably, the operating mechanism includes a tripping half-shaft for triggering the tripping of the operating mechanism, and the tripping half-shaft simultaneously drives the locking component to unlock the interlocking parts.

[0012] Preferably, the interlocking element includes:

[0013] The rotating part is sleeved on the main shaft and rotates synchronously with the main shaft.

[0014] A locking part is provided on the rotating part in a radially protruding manner for limiting engagement with the locking assembly.

[0015] Preferably, the interlocking component is a contact cantilever, which further includes a contact head. The contact head is connected to a contact support, and the contact support drives the moving contact to contact and separate from the stationary contact.

[0016] Preferably, the contact system is installed inside the base, the operating mechanism is installed on the base, and the base includes a base side plate disposed between the main shaft and the contact system. After the circuit breaker is closed, the interlocking component and the base side plate form a locking space. The path of the interlocking component rotating from the closed position to the open position covers the locking space, and the locking component is inserted into the locking space to lock the interlocking component.

[0017] Preferably, when the locking component is inserted into the locking space, its two sides respectively contact and engage with the interlocking component and the base side plate.

[0018] Preferably, the base side plate is provided with a clearance hole. When the circuit breaker is tripped, the interlocking part is embedded in the clearance hole. After the circuit breaker is closed, the locking component is inserted into the locking space and covers part of the clearance hole.

[0019] Preferably, the locking component includes:

[0020] The rotating component is rotatably configured such that its axis of rotation is perpendicular to the axis of rotation of the interlocking component.

[0021] The locking shaft is fixedly connected to the rotating component and swings synchronously with the rotating component.

[0022] Preferably, the locking component includes:

[0023] The rotating component has its axis of rotation perpendicular to the axis of rotation of the interlocking component;

[0024] The locking shaft is fixedly connected to the rotating component and swings synchronously with the rotating component. The diameter of the locking shaft is greater than the thickness of the rotating component. After the switch is closed, the rotating component drives the locking shaft to be inserted into the locking space. The two radial sides of the locking shaft contact the interlocking component and the base side plate, respectively.

[0025] Preferably, the locking shaft is a half-shaft structure, the locking shaft has a cross-section, and two arc-shaped guide flanges are formed on both radial sides of the locking shaft. The two guide flanges are in line contact with the interlocking component and the base side plate, respectively.

[0026] Preferably, the guide flange surface is provided with a wear-resistant coating.

[0027] Preferably, the operating mechanism includes two oppositely arranged mechanism side plates, the mechanism side plates being perpendicular to the base side plate, and the locking mechanism being located on the outside of the two mechanism side plates; the locking assembly further includes a bracket, the bracket being fixedly connected to the mechanism side plate and / or the base side plate, and a rotating component being rotatably mounted on the rotating component.

[0028] Preferably, the rotating member includes:

[0029] The pivot part is rotatably connected to the bracket, and the locking shaft is located at the end of the pivot part away from the operating mechanism;

[0030] The swing part is vertically connected to the end of the pivot part near the operating mechanism and is used to cooperate with the unlocking part.

[0031] Preferably, the locking shaft is provided with an extension plate that is perpendicular to the cut surface. The extension plate is inserted between the pivot and the base side plate and fixed to the end of the pivot. The diameter of the locking shaft is larger than the thickness of the extension plate, and a stepped surface is formed at the end of the locking shaft.

[0032] The rotating component is rotatably connected to the bracket via a rotating shaft. The middle part of the rotating shaft passes through the rotating component and the bracket. One end is located in the bracket gap between the bracket and the base side plate, and the other end is provided with a limiting plate spaced apart from the pivot part.

[0033] The elastic element is a torsion spring. The spiral part of the elastic element is sleeved on the rotating shaft and located between the limiting plate and the rotating part. The first end of the elastic element is connected to the side plate of the mechanism, and the second end is connected to the stepped surface of the locking shaft.

[0034] Preferably, the edge of the mechanism side plate extends into a connecting plate parallel to the base side plate. The bracket includes a longitudinal support plate and a transverse support plate. The longitudinal support plate is in contact with the side of the connecting plate. The connecting plate is located between the longitudinal support plate and the base side plate. The longitudinal support plate, the connecting plate, and the base side plate are fixed by fasteners.

[0035] Preferably, the top of the longitudinal support plate extends above the top of the side plate of the mechanism and is provided with a reverse-locking limiting hook. The limiting hook is locked onto the top edge of the side plate of the mechanism to form a limit. The side of the longitudinal support plate near the operating mechanism contacts and cooperates with the outer surface of the side plate of the mechanism. The transverse support plate is located on the side of the longitudinal support plate away from the operating mechanism.

[0036] The circuit breaker of this embodiment has the following beneficial effects:

[0037] (1) After closing, the interlocking component is locked in the closed position by the elastic element driving the locking component, so that the main shaft cannot rotate. If a large current passes through the contact system at this time, but the current will not trigger the tripping due to the short circuit protection, the main shaft can replace the linkage mechanism to provide rigid support for the contact system and effectively withstand the electrodynamic impact generated by the short-term large current. This avoids insufficient support for the moving contact due to the accumulated tolerance of the linkage mechanism, reduces the risk of moving contact retraction, and thus avoids the overtravel reduction of the moving contact. This ensures that the moving contact and the stationary contact can still make reliable contact under the impact of the short-term large current, and improves the short-term resistance index of the product.

[0038] (2) When the circuit breaker is tripped, the unlocking component drives the locking component to unlock the interlocking component, ensuring reliable tripping of the product;

[0039] (3) By providing a continuous and stable driving force to the locking component through the elastic element, it can be ensured that the locking component is quickly reset to the position of the locking interlock after the circuit is closed.

[0040] Furthermore, the linkage design between the unlocking component and the tripping half shaft not only enables the locking component to unlock the interlocking component and the linkage mechanism to unlock synchronously, avoiding interference caused by disordered action sequence, but also eliminates the need to add new components, making the structure simpler.

[0041] Furthermore, the cantilever arm of the drive contact, which is independently supported by the traditional design, is integrated with the function of the interlocking component. This not only reduces the number of parts, simplifies the assembly process, and lowers the cost of parts processing and management, but also allows the main shaft to act as the rotation fulcrum of the interlocking component when the circuit is closed. Through the coaxially set locking part and contact head, the limiting force of the locking component is directly applied to the contact support, avoiding the attenuation of the support force due to transmission through multiple linkages in the traditional design. This effectively suppresses the retraction of the moving contact.

[0042] In addition, after the locking component is inserted into the locking space, its two sides contact the outer surface of the interlocking component and the base side plate respectively, so that the base side plate participates in the support force of the contact support through the locking component and serves as the final load-bearing structure. Its thickness and strength are much higher than the independent support scheme of the locking component, which can significantly improve the impact force and service life. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the locking mechanism of the present invention;

[0044] Figure 2 This is a schematic diagram of the circuit breaker structure after it is closed according to the present invention;

[0045] Figure 3 This is a schematic diagram of the locking mechanism of the present invention after it is closed;

[0046] Figure 4 This is a schematic diagram of the circuit breaker structure after it has been tripped according to the present invention;

[0047] Figure 5 This is a schematic diagram of the locking mechanism of the present invention after it is tripped;

[0048] In the picture:

[0049] 1 operating mechanism 15 connecting plate

[0050] 4 elastic elements 21 moving contacts

[0051] 5 Locking Components 22 Stationary Contacts

[0052] 7 bases and 23 contact supports

[0053] 8-bracket 24-wire mechanism

[0054] 11 Mechanism side plate 25 Contact connecting rod

[0055] 12 spindles 41 first end

[0056] 13 Contact cantilever 42 Second end

[0057] 14 tripping half-shafts, 51 rotating parts

[0058] 52 Locking Shaft 511 Pivoting Part

[0059] 71 Base side plate 512 Swinging part

[0060] 72 Locking Space 513 Spindle

[0061] 73 clearance hole 514 limit plate

[0062] 81 Longitudinal support plate 521 cross section

[0063] 82 Horizontal Support Plate 522 Guide Flange

[0064] 83 Limit Hook 523 Extension Plate

[0065] 131 Rotating Part 524 Rivets

[0066] 132 Locking Part 525 Step Surface

[0067] 133 contact head Detailed Implementation

[0068] The following embodiments, in conjunction with the accompanying drawings, further illustrate specific implementations of the circuit breaker of the present invention. The circuit breaker of the present invention is not limited to the descriptions in the following embodiments.

[0069] like Figure 2As shown, the circuit breaker in this embodiment is a universal circuit breaker (frame circuit breaker), including a housing, an operating mechanism 1, a protection mechanism, a drive mechanism, and at least one switch module. The switch module includes a contact system, an arc extinguishing mechanism, and two wiring mechanisms 24. The contact system includes a moving contact 21, a stationary contact 22, a contact support 23, and a contact spring. The moving contact 21 is mounted on the contact support 23 and connected to the contact spring. The moving contact 21 and the stationary contact 22 are respectively connected to the line through the corresponding wiring mechanism 24. The contact support 23 can drive the moving contact 21 to contact and separate from the stationary contact 22, so as to conduct and disconnect the connected line respectively, realizing closing and opening.

[0070] The circuit breaker housing includes a base 7, the switch module is installed inside the base 7, and the operating mechanism 1 is installed on the base 7. The operating mechanism 1 includes two opposing mechanism side plates 11, and a main shaft 12 and a drive shaft respectively rotatably mounted on the two mechanism side plates 11. The main shaft 12 can rotate between the closed position and the open position. A contact cantilever 13 is installed on the main shaft 12, and the contact cantilever 13 is connected to the contact support 23 through a contact connecting rod 25. A connection is provided between the two mechanism side plates 11.

[0071] The energy storage mechanism includes a closing spring and a opening spring, which are used to provide closing driving force and opening driving force, respectively. The energy storage mechanism drives the main shaft 12 to rotate between the closing position and the opening position through a linkage mechanism. When the main shaft 12 rotates, it drives the moving contact 21 to contact and separate from the stationary contact 22, so as to realize closing and opening respectively.

[0072] The linkage mechanism includes a transmission component, a trip latch, and a locking latch. The transmission component and the trip latch are connected by a hinge shaft. The locking latch is used to lock the position of the trip latch and lock the trip spring in a compressed state through the trip latch.

[0073] The cam mechanism is connected to the drive shaft. Under the drive of the drive shaft, it compresses the closing spring, causing the energy storage mechanism to store energy.

[0074] The tripping half-shaft 14 is used to trigger the tripping of the operating mechanism. It can be driven by the tripping button, tripping device, protection mechanism or other mechanism to trigger the latch and tripping latch to unlock and release the tripping spring, even if the operating mechanism trips.

[0075] The closing process of the circuit breaker in this embodiment is as follows: (1) Energy storage stage: The drive shaft rotates under the drive of the drive mechanism, and the cam mechanism compresses the closing spring, so that the closing spring enters the energy storage state. The drive mechanism is a manual operating handle and / or a motor. (2) When the circuit breaker is in the open state and the operating mechanism is in the energy storage state, the closing button can be pressed to drive the energy storage mechanism to release energy. The released closing spring pushes the linkage mechanism to drive the main shaft 12 to rotate. The main shaft 12 drives the contact support 23 to rotate through the contact cantilever 13, so that the contact support 23 drives the moving contact 21 to close with the stationary contact 22 to achieve closing. At this time, the trip latch and the lock latch are in the interlocked state, and the opening spring is locked in the compressed state.

[0076] The manual tripping process is as follows: (1) Press the tripping button, the tripping half shaft 14 triggers the latch and tripping latch to unlock and release the tripping spring; (2) The released tripping spring drives the main shaft 12 to rotate through the linkage mechanism, and the main shaft 12 drives the contact support 23 to rotate through the contact cantilever 13, so that the contact support 23 drives the moving contact 21 to separate from the stationary contact 22 to achieve tripping.

[0077] The tripping process caused by the fault trip is as follows: (1) The overload trip or short circuit trip as the protection mechanism is activated, driving the tripping half shaft 14 to trigger the latch and trip latch to unlock and release the tripping spring; (2) The released tripping spring drives the main shaft 12 to rotate through the linkage mechanism, and the main shaft 12 drives the contact support 23 to rotate through the contact cantilever 13, so that the contact support 23 drives the moving contact 21 to separate from the stationary contact 22 to achieve tripping.

[0078] This is existing technology in this field and will not be elaborated further. The short-term withstand capability requirements of existing circuit breakers are also constantly increasing. Circuit breakers should not trip when subjected to short-term high withstand current. However, the electrodynamic repulsion force generated by the short-term high current can cause the contacts to overtravel and retract, resulting in a decrease in the final contact pressure and a surge in contact resistance.

[0079] like Figure 1-5 As shown, an improvement in this embodiment is that the operating mechanism further includes a locking mechanism, which includes:

[0080] The interlocking component is fixedly mounted on the main shaft 12 and can rotate with the main shaft 12 between the closed and open positions.

[0081] The locking component 5, driven by the elastic element 4, locks the interlocking element that rotates with the main shaft 12 to the closed position, so that the main shaft 12 cannot rotate to the open position.

[0082] The unlocking component is linked with the operating mechanism 1. When the circuit breaker is opened, the operating mechanism 1 uses the unlocking component to drive the locking component 5 to release the lock on the interlocking component.

[0083] The working process of the locking mechanism is as follows: when the circuit breaker is closed, the main shaft 12 drives the interlocking component to rotate to the closed position, and the elastic component 4 drives the locking assembly 5 to lock the interlocking component in the closed position, so that the main shaft 12 cannot rotate to the open position. The main shaft 12 provides rigid support for the moving contact 21, avoiding the electric repulsion force generated by the short-term large current from causing the contact to overtravel and retract.

[0084] When the circuit breaker is tripped (manual tripping or fault tripping), the tripping action of the operating mechanism 1 drives the locking component 5 to unlock the interlocking component through the unlocking component, so that the main shaft 12 can rotate, so that the main shaft 12 can complete the tripping action and drive the interlocking component to rotate to the tripping position.

[0085] The circuit breaker of this embodiment has the following beneficial effects:

[0086] (1) After closing, the locking component 5 is driven by the elastic element 4 to lock the interlocking component in the closed position, so that the main shaft 12 cannot rotate. If a large current passes through the contact system, but the current will not trigger the tripping due to the short circuit protection, the main shaft 12 can replace the linkage mechanism to provide rigid support for the contact system and effectively withstand the electrodynamic impact generated by the short-term large current. This avoids the linkage mechanism from being insufficiently supported by the moving contact 21 due to accumulated tolerances, reduces the risk of the moving contact 21 retraction, and thus avoids the overtravel reduction of the moving contact 21. This ensures that the moving contact 21 and the stationary contact 22 can still make reliable contact under the impact of the short-term large current, and improves the short-term resistance index of the product.

[0087] (2) When the circuit breaker is tripped, the locking component 5 is driven by the unlocking component to unlock the interlocking component, ensuring reliable tripping of the product;

[0088] (3) The elastic element 4 provides a continuous and stable driving force to the locking component 5, which can ensure that the locking component 5 is quickly reset to the position of the locking interlock after the circuit is closed.

[0089] like Figure 2-4 As shown, in this embodiment, the tripping half-shaft 14 constitutes the unlocking component. Specifically, the tripping half-shaft 14 simultaneously triggers the locking latch and trip latch to unlock, and drives the locking assembly 5 to unlock the interlocking component. During tripping (manual tripping or fault tripping), the tripping button, trip unit, or protection mechanism drives the tripping half-shaft 14 of the operating mechanism to rotate. The tripping half-shaft 14 triggers the tripping of the operating mechanism 1, i.e., triggers the locking latch and trip latch to unlock, and simultaneously drives the locking assembly 5 to unlock the interlocking component. The locking mechanism is located on the outer side of the mechanism side plate 11, and the tripping half-shaft 14 body is located on the inner side of the operating mechanism 1. The tripping half-shaft 14 has an unlocking end extending outward to cooperate with the locking assembly 5. The tripping half-shaft 14 pushes the locking assembly 5 to unlock the interlocking component through the unlocking end. Through the linkage design of the unlocking component and the tripping half-shaft 14, not only is the unlocking of the interlocking component by the locking assembly 5 synchronized with the unlocking of the linkage mechanism, avoiding interference caused by disordered action sequence, but also no new components are needed, resulting in a simpler structure.

[0090] In other embodiments, the unlocking component can be an independently configured unlocking electromagnet or trip unit. When the opening electromagnet drives the opening half-shaft 14 to perform the opening action, it simultaneously drives the locking component 5 to separate from the interlocking component directly or indirectly through the unlocking electromagnet. Alternatively, the unlocking component can also be an extension of the linkage mechanism of the operating mechanism 1. When the linkage mechanism is unlocked, the extension structure directly or indirectly drives the locking component 5 to separate from the interlocking component.

[0091] like Figure 2-4 As shown, the contact cantilever 13 in this embodiment constitutes the interlocking member, and the contact cantilever 13 includes:

[0092] The rotating part 131 is sleeved on the main shaft 12 and rotates synchronously with the main shaft 12.

[0093] The locking part 132 is radially protruding on the rotating part 131 and is limited to the locking assembly 5 after the circuit is closed;

[0094] The contact head 133 is connected to the contact support 23 via the contact connecting rod 25. It is used to drive the contact support 23 to rotate, and through the contact support 23, it drives the moving contact 21 to contact and separate from the stationary contact 22, thereby realizing the closing and opening of the circuit breaker respectively.

[0095] By directly using the contact cantilever 13 as an interlocking component, the contact cantilever 13 of the independent drive contact support 23 in the traditional design is integrated into the function of an interlocking component. This not only reduces the number of parts, simplifies the assembly process, and reduces the cost of parts processing and management, but also allows the main shaft 12 to act as the rotation fulcrum of the interlocking component in the closed state. The interlocking component is formed through the contact cantilever 13, so that the limiting force of the locking component 5 is directly applied to the contact support 23 through the integrated contact cantilever 13. At the same time, it prevents the closing angle φ of the contact cantilever 13 from decreasing, avoiding the attenuation of the support force due to the multi-stage transmission of the linkage mechanism in the traditional design, thereby effectively suppressing the retraction of the moving contact 21.

[0096] In other embodiments, the locking part 132 may be a cantilever structure independently set on the spindle 12, with no mechanical connection to the contact support 23 (equivalent to a contact cantilever 13 without a contact head 133), or the locking part 132 may be a boss structure integrally formed on the surface of the spindle 12, with the side of the boss serving as the locking contact surface.

[0097] Furthermore, such as Figure 3-4As shown, the base 7 includes a base body and a base side plate 71 disposed between the main shaft 12 and the contact support 23. The operating mechanism is mounted on the base side plate 71. After the circuit breaker is closed, the interlocking component and the base side plate 71 form a locking space 72. The interlocking component covers the locking space 72 as the main shaft 12 rotates from the closed position to the open position. After the locking component 5 is inserted into the locking space 72, its two sides contact the outer surface of the interlocking component and the base side plate 71 respectively, locking the interlocking component, so that the base side plate 71 participates in the support force of the contact support 23 through the locking component 5. At this time, the transmission path of the backlash force generated by the short-circuit current is: moving contact 21, contact support 23, interlocking component, locking component 5, base side plate 71, base body. The base body serves as the final load-bearing structure, and its thickness and strength are much higher than the independent support scheme of the locking component 5, which can significantly improve the impact force and service life. Figure 2 As shown, after the circuit breaker is closed, the locking component 5, driven by the elastic element 4, inserts into the locking space 72 to lock the interlocking element; as Figure 4 As shown, after the circuit breaker trips, the tripping half-shaft 14 drives the locking assembly 5 to overcome the force of the elastic element 4 and move out of the locking space 72, thus releasing the locking of the interlocking element.

[0098] Furthermore, such as Figure 3 As shown, the base side plate 71 has a clearance hole 73 on the side of the locking space 72. When the circuit is opened, the interlocking part is embedded in the clearance hole 73, which reduces the distance between the interlocking part and the inner wall of the base side plate 71. When the locking assembly 5 is inserted into the locking space 72, its end covers part of the clearance hole 73. The clearance hole 73 design not only makes the axial installation space of the main shaft 12 and the contact support 23 more compact, adapting to the layout requirements of compact circuit breakers, but also reduces the contact between the locking assembly 5 and the base side plate 71 when it covers the clearance hole 73, thus reducing the friction between the locking assembly 5 and the base side plate 71.

[0099] like Figure 1-4 As shown, the mechanism side plate 11 is perpendicular to the base side plate 71. The locking mechanism is located outside the mechanism side plate 11 and within the right-angle space formed by one of the mechanism side plates 11 and the base side plate 71. The edge of the mechanism side plate 11 extends into a connecting plate 15 parallel to the base side plate 71. The locking mechanism also includes a bracket 8, and the locking assembly 5 is mounted on the bracket 8 and / or the base side plate 71. In this embodiment, the bracket 8 includes a longitudinal support plate 81 and a transverse support plate 82. The longitudinal support plate 81 is in contact with the side of the connecting plate 15. The connecting plate 15 is located between the longitudinal support plate 81 and the base side plate 71. The longitudinal support plate 81, the connecting plate 15, and the base side plate 71 are fixed by fasteners, forming a bracket gap between the transverse support plate 82 and the base side plate 71 with a width approximately equal to the thickness of the connecting plate 15.

[0100] Preferably, the top of the longitudinal support plate 81 extends above the top of the mechanism side plate 11 and is provided with a reverse-locking limiting hook 83. The limiting hook 83 is locked onto the top edge of the mechanism side plate 11 to form a limit. The side of the longitudinal support plate 81 near the operating mechanism 1 is in contact with the outer surface of the mechanism side plate 11. The transverse support plate 82 is provided on the side of the longitudinal support plate 81 away from the operating mechanism 1.

[0101] like Figure 1 As shown, the locking component 5 includes:

[0102] Rotating component 51 is rotatably mounted on bracket 8, and its rotation axis is perpendicular to the axis of rotation path of interlocking component;

[0103] The locking shaft 52 is fixedly connected to the rotating part 51 and swings synchronously with the rotating part 51. The diameter of the locking shaft 52 is greater than the thickness of the rotating part 51. After the circuit is closed, the rotating part 51 drives the locking shaft 52 to be inserted into the locking space 72. The two radial sides of the locking shaft 52 contact the interlocking part and the base side plate 71, respectively.

[0104] Furthermore, the locking shaft 52 is a half-shaft structure. The locking shaft 52 has a tangent 521 arranged parallel to the axis, and the depth of the tangent 521 is less than the radius. Two arc-shaped guide flanges 522 are formed on both radial sides of the locking shaft 52. The two guide flanges 522 are in line contact with the interlocking member and the base side plate 71, respectively. The line contact can reduce the friction between the interlocking member and the base side plate 71.

[0105] Preferably, the surface of the guide flange 522 is provided with a wear-resistant coating, such as a chromium coating, which can not only reduce friction but also reduce wear on the locking shaft 52 and extend its service life.

[0106] It is understood that the locking shaft 52 can also be a complete cylindrical structure, or a rectangular or polygonal column, or other shapes. The locking shaft 52 can also be integrally formed with the rotating component 51, but this would increase the difficulty of parts processing. In addition, the bracket 8 can be omitted, and the locking component 5 can be directly set on the extension structure of the mechanism side plate 11 or on the base side plate 71, both of which fall within the protection scope of this invention.

[0107] Furthermore, the rotating member 51 in this embodiment includes:

[0108] The pivot part 511 is rotatably connected to the bracket 8 via the pivot shaft 513, and the locking shaft 52 is located at the end of the pivot part 511 away from the operating mechanism 1;

[0109] The swing part 512 is vertically connected to the end of the pivot part 511 near the operating mechanism 1 and is used to cooperate with the unlocking member. The swing part 512 is located below the unlocking end and is set vertically to the unlocking end. The opening half shaft 14 serves as the unlocking member. When the circuit is opened, the swing part 512 is pushed through the unlocking end, causing the pivot part 511 to rotate and drive the locking shaft 52 out of the locking space 72.

[0110] Among them, the locking shaft 52 is provided with an extension plate 523 that is perpendicular to the cut surface 521. The extension plate 523 is inserted between the pivot part 511 and the base side plate 71 and is fixed to the end of the pivot part 511 by rivets 524. The diameter of the locking shaft 52 is larger than the thickness of the extension plate 523, and a stepped surface 525 is formed at the end of the locking shaft 52.

[0111] The pivot 513 passes through the pivot 511 and the transverse support plate 82 in the middle. One end is located in the bracket gap between the transverse support plate 82 and the base side plate 71 of the bracket 8, and the other end is provided with a limiting plate 514 spaced apart from the pivot 511.

[0112] In this embodiment, the elastic element 4 is a torsion spring. The helical portion of the elastic element 4 is sleeved on the rotating shaft 513 and located between the limiting plate 514 and the rotating member 51. The first end 41 of the elastic element 4 is connected to the side plate 11 of the mechanism, and the second end 42 is connected to the stepped surface 525 of the locking shaft 52. The driving force of the elastic element 4 causes the locking shaft 52 to rotate with the pivot part 511 around the rotating shaft 513. Obviously, the elastic element 4 can also be a tension spring, compression spring, leaf spring, or other elastic elements.

[0113] It should be noted that in the description of this invention, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship conventionally placed during use. They are used only for ease of description and do not indicate that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating relative importance.

[0114] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A circuit breaker, comprising an operating mechanism (1) and a contact system, the operating mechanism (1) comprising a main shaft (12) rotatable between a closed position and an open position, the contact system comprising a moving contact (21) and a stationary contact (22), the main shaft (12) being connected to the moving contact (21), characterized in that, The operating mechanism (1) further includes a locking mechanism, which includes: The interlocking component is fixedly mounted on the main shaft (12) and can rotate with the main shaft (12) between the closed position and the open position; The locking component (5) locks the interlocking component that rotates with the main shaft (12) to the closed position under the drive of the elastic element (4), so that the main shaft (12) cannot rotate to the open position; The unlocking component is linked with the operating mechanism (1). When the circuit breaker is opened, the operating mechanism (1) unlocks the interlocking component by driving the locking component (5).

2. The circuit breaker according to claim 1, characterized in that, The operating mechanism (1) includes a tripping half shaft (14) for triggering the tripping of the operating mechanism (1). The tripping half shaft (14) triggers the tripping of the operating mechanism (1) while driving the locking component (5) to unlock the interlocking component.

3. The circuit breaker according to claim 1, characterized in that, The interlocking component includes: The rotating part (131) is sleeved on the main shaft (12) and rotates synchronously with the main shaft (12); A locking part (132) is provided on the rotating part (131) in a radial protrusion for limiting engagement with the locking assembly (5).

4. The circuit breaker according to claim 3, characterized in that, The interlocking component is a contact cantilever (13), which also includes a contact head (133). The contact head (133) is connected to a contact support (23), and the contact support (23) drives the moving contact (21) to contact and separate from the stationary contact (22).

5. The circuit breaker according to any one of claims 1-4, characterized in that, The contact system is installed in the base (7), and the operating mechanism (1) is installed on the base (7). The base (7) includes a base side plate (71) disposed between the main shaft (12) and the contact system. After the circuit breaker is closed, the interlocking member and the base side plate (71) form a locking space (72) at intervals. The path of the interlocking member rotating from the closed position to the open position covers the locking space (72). The locking component (5) is inserted into the locking space (72) to lock the interlocking member.

6. The circuit breaker according to claim 5, characterized in that, When the locking component (5) is inserted into the locking space (72), it contacts and engages with the interlocking component and the base side plate (71) on both sides respectively.

7. The circuit breaker according to claim 5, characterized in that, The base side plate (71) is provided with a clearance hole (73). When the circuit breaker is tripped, the interlocking part is embedded in the clearance hole (73). After the circuit breaker is closed, the locking component (5) is inserted into the locking space (72) and covers part of the clearance hole (73).

8. The circuit breaker according to claim 1, characterized in that, The locking component (5) includes: Rotating component (51) is rotatably configured such that its rotation axis is perpendicular to the axis of the rotation path of the interlocking component; The locking shaft (52) is fixedly connected to the rotating part (51) and swings synchronously with the rotating part (51).

9. The circuit breaker according to claim 5, characterized in that, The locking component (5) includes: The rotating component (51) has its rotation axis perpendicular to the axis of the rotation path of the interlocking component; The locking shaft (52) is fixedly connected to the rotating part (51) and swings synchronously with the rotating part (51). The diameter of the locking shaft (52) is greater than the thickness of the rotating part (51). After the switch is closed, the rotating part (51) drives the locking shaft (52) to be inserted into the locking space (72). The two radial sides of the locking shaft (52) contact the interlocking part and the base side plate (71) respectively.

10. The circuit breaker according to claim 9, characterized in that, The locking shaft (52) is a half-shaft structure. The locking shaft (52) has a cut surface (521). Two arc-shaped guide flanges (522) are formed on both radial sides of the locking shaft (52). The two guide flanges (522) are in line contact with the interlocking component and the base side plate (71), respectively.

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