A locking mechanism and circuit breaker

Abstract

The application discloses a locking mechanism and a circuit breaker, and relates to the technical field of switch electric appliances. The locking mechanism comprises a shell, a handle and a buckle arranged in the shell, the handle is rotationally connected with the shell, the handle is connected with the buckle, a through hole is arranged on the shell, the buckle is retracted into the shell when the handle drives an operating mechanism to be tripped, and the buckle protrudes from the shell through the through hole when the handle drives the operating mechanism to be closed. The circuit breaker can prevent misoperation when the circuit breaker is inserted into or withdrawn from a cabinet, and the safety during use is improved.

Description

Technical Field

[0001] This application relates to the field of switchgear technology, and more specifically, to a locking mechanism and a circuit breaker. Background Technology

[0002] Circuit breakers can be used to distribute electrical energy, infrequently start asynchronous motors, and provide real-time protection for power lines and mechanical equipment. When they experience severe overload, short circuit, or undervoltage faults, they can automatically disconnect the circuit. Their function is equivalent to a combination of a fuse switch and an over / under-temperature relay.

[0003] Circuit breakers are classified by installation method into three types: plug-in, fixed, and drawer-type. The use of plug-in circuit breakers can effectively improve the safety of electrical equipment. With the widespread use of plug-in circuit breakers in various electrical equipment, in order to meet the installation needs of various electrical equipment, the structure of plug-in circuit breakers has also developed into various forms.

[0004] The use of plug-in circuit breakers not only provides various safety protection features inherent in circuit breakers for power lines and electrical equipment, but also meets the power quality requirements of different electrical devices. Furthermore, it allows for convenient insertion and removal of the circuit breaker through a plug-in / plug-out mechanism. However, the use of plug-in circuit breakers may carry risks such as accidental insertion into the chassis while the circuit is closed, accidental closing of the circuit breaker before proper installation, or accidental removal from the chassis while the circuit is closed. Summary of the Invention

[0005] The purpose of this application is to provide a locking mechanism and a circuit breaker that can prevent accidental operation when the circuit breaker is inserted into or removed from the chassis, thereby improving safety during use.

[0006] The embodiments of this application are implemented as follows:

[0007] In one aspect of this application, a locking mechanism is provided, including a housing, a handle and a buckle disposed within the housing, the handle being rotatably connected to the housing and the handle being connected to the buckle, the housing having a through hole, the buckle retracting into the housing when the handle drives the operating mechanism to open the circuit breaker, and the buckle protruding out of the housing through the through hole when the handle drives the operating mechanism to close the circuit breaker.

[0008] Optionally, the buckle includes a connecting part, a rotating part, and a holding part connected in sequence. The rotating part is rotatably connected to the housing, and the connecting part is hinged to the handle at an eccentric position toward the connecting part, so that when the handle is rotated, the buckle is driven to rotate.

[0009] Optionally, the handle is provided with a connecting arm, the connecting arm is provided with a positioning hole, the connecting part is provided with a slot hole corresponding to the positioning hole, and the locking mechanism further comprises a trip lever, one end of the trip lever extends out of the shell, and the other end of the trip lever is respectively arranged in the positioning hole and the slot hole.

[0010] Optionally, the buckle is a sliding block, the sliding block is in sliding connection with the shell, and the sliding block is connected with the handle through a connecting rod; when the handle rotates, the sliding block is driven to slide along the shell, so that the sliding block extends out of or retracts into the shell.

[0011] Optionally, the sliding block is provided with a first connecting hole, the handle is provided with a second connecting hole, and two ends of the connecting rod are respectively connected in the first connecting hole and the second connecting hole, so that the connecting rod is hinged with the sliding block and the handle respectively.

[0012] Optionally, the handle is provided with an auxiliary pull rod, one end of the auxiliary pull rod extends out of the shell, and the other end of the auxiliary pull rod is hinged with the handle; when the auxiliary pull rod is pulled, the handle rotates, so that the operating mechanism is opened.

[0013] Optionally, the handle comprises a rotating body, and a knob is arranged on the rotating body, or the handle comprises a rotating body, and a first pressing part and a second pressing part are oppositely arranged on the rotating body.

[0014] Optionally, the shell is provided with a manual pull rod.

[0015] Another aspect of the embodiment of the application provides a circuit breaker, comprising the locking mechanism according to any one of the above, and an operating mechanism arranged in the shell, the operating mechanism being connected with the handle.

[0016] Optionally, the shell is further provided with a short-circuit protector, the short-circuit protector and the operating mechanism are respectively located on opposite sides of the shell in the width direction, and the short-circuit protector is arranged along the width direction of the circuit breaker; one side of the shell in the length direction is further provided with an input terminal and an output terminal, wherein the input terminal is connected with a moving contact, and the output terminal is connected with a static contact.

[0017] The beneficial effects of the embodiment of the application include:

[0018] The locking mechanism and circuit breaker provided by the embodiment of the present application comprises a shell, a handle and a buckle arranged in the shell, the handle is rotationally connected with the shell, and the handle can drive the operating mechanism to act when the handle rotates, so as to open or close the circuit breaker. Meanwhile, the handle is connected with the buckle, and the buckle synchronously acts when the handle drives the operating mechanism to act. When the circuit breaker is in the open state, the buckle is retracted into the shell, and the buckle does not interfere with the cabinet during the process of inserting or extracting the circuit breaker into the cabinet, so that the circuit breaker can be smoothly inserted or extracted into the cabinet. When the circuit breaker is in the closed state, the buckle protrudes from the shell through the through hole, at this time, the circuit breaker cannot be inserted into the cabinet if it has not been inserted into the cabinet, and the circuit breaker cannot be extracted if it has been installed in the cabinet. During the process of inserting the circuit breaker into the cabinet, if the handle is rotated to drive the operating mechanism to act for closing operation, the circuit breaker cannot protrude from the shell if it has not been pushed into place, so that the rotation of the handle is limited, and the closing operation cannot be performed. By using the above method, the misoperation of the circuit breaker during the process of inserting or extracting the circuit breaker into the cabinet can be prevented, and the safety during use is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0020] Figure 1 One of the structure schematic diagrams of the locking mechanism provided by the embodiment of the present application;

[0021] Figure 2 The second structure schematic diagram of the locking mechanism provided by the embodiment of the present application;

[0022] Figure 3 The third structure schematic diagram of the locking mechanism provided by the embodiment of the present application;

[0023] Figure 4 The fourth structure schematic diagram of the locking mechanism provided by the embodiment of the present application;

[0024] Figure 5 The fifth structure schematic diagram of the locking mechanism provided by the embodiment of the present application;

[0025] Figure 6 The sixth structure schematic diagram of the locking mechanism provided by the embodiment of the present application;

[0026] Figure 7 The seventh structure schematic diagram of the locking mechanism provided by the embodiment of the present application;

[0027] Figure 8 Eighth schematic diagram of the locking mechanism provided in the embodiments of this application;

[0028] Figure 9 This is a schematic diagram of the circuit breaker provided in an embodiment of this application.

[0029] Icons: 100-Locking mechanism; 110-Housing; 112-Through hole; 120-Handle; 122-Connecting arm; 124-Second connecting hole; 126-Rotating body; 127-Toggle; 128-First pressing part; 129-Second pressing part; 1222-Positioning hole; 130-Snap-on; 132-Connecting part; 134-Rotating part; 136-Holding part; 138-First connecting hole; 140-Operating mechanism; 150-Trigger lever; 160-Linking rod; 170-Auxiliary lever; 180-Manual lever; 200-Circuit breaker; 210-Short circuit protector; 220-Input terminal; 230-Output terminal. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0032] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] In the description of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] In the case of using plug-in circuit breaker, there is a risk that the circuit breaker is misoperated to be inserted into the cabinet in the closed state, the circuit breaker is closed when not installed in place, or the circuit breaker is directly pulled out of the cabinet in the closed state. To solve the above problems, the embodiments of the present application provide the following solutions to prevent misoperation when the circuit breaker is inserted or withdrawn from the cabinet, and improve the safety during use.

[0035] Please refer to Figure 1 and Figure 2 The embodiments of the present application provide a locking mechanism 100, which comprises a shell 110, a handle 120 and a buckle 130 arranged in the shell 110, the handle 120 is rotatably connected with the shell 110, and the handle 120 is connected with the buckle 130, the shell 110 is provided with a through hole 112, in the state that the handle 120 drives the operating mechanism 140 to open, the buckle 130 is retracted into the shell 110, and in the state that the handle 120 drives the operating mechanism 140 to close, the buckle 130 protrudes from the shell 110 through the through hole 112.

[0036] Specifically, through the shell 110 and the handle 120 arranged in the shell 110, the handle 120 is rotatably connected with the shell 110, for example, when the handle 120 is forward rotated, the operating mechanism 140 is driven to act, so that the circuit breaker is closed, and when the handle 120 is reversely rotated, the operating mechanism 140 is driven to act again, so that the circuit breaker is opened. In the open state of the circuit breaker, the circuit breaker can be inserted into or withdrawn from the cabinet (as shown in Figure 1 In the closed state of the circuit breaker, the buckle 130 protrudes from the shell 110 through the through hole 112, so that the buckle 130 is clamped with the cabinet, avoiding being withdrawn from the cabinet in the closed state of the circuit breaker, and being beneficial to improving the safety during use.

[0037] Through the buckle 130 connected with the handle 120, when the handle 120 is forward or reversely rotated, the buckle 130 is driven to act synchronously, so that in the open state, the buckle 130 is retracted into the shell 110, and in the closed state, the buckle 130 protrudes from the shell 110 through the through hole 112. Since the handle 120 is connected with the buckle 130, the handle 120 can act on the buckle 130 to drive the buckle 130 to act. Similarly, the buckle 130 can also act on the handle 120, for example, when the circuit breaker is inserted into the cabinet, the buckle 130 is limited by the inner wall of the cabinet and cannot protrude from the shell 110, the handle 120 is blocked by the buckle 130 and cannot drive the operating mechanism 140 to close, avoiding the circuit breaker being closed when not installed in place.

[0038] The locking mechanism 100 provided by the embodiment of the present application is connected with the handle 120 and the buckle 130 arranged in the shell 110, and the handle 120 is rotationally connected with the shell 110. When the handle 120 rotates, the operating mechanism 140 can be driven to act to open or close the circuit breaker. Meanwhile, the handle 120 is connected with the buckle 130, and when the handle 120 drives the operating mechanism 140 to act, the buckle 130 is also driven to act synchronously. When the circuit breaker is in the open state, the buckle 130 is retracted into the shell 110, and during the process of inserting or extracting the circuit breaker into the cabinet, the buckle 130 does not interfere with the cabinet, and the circuit breaker can be smoothly inserted or extracted into the cabinet. When the circuit breaker is in the closed state, the buckle 130 protrudes from the shell 110 through the through hole 112, and at this time, if the circuit breaker has not been inserted into the cabinet, it cannot be inserted; if the circuit breaker has been installed in the cabinet, the buckle 130 is clamped and matched with the limiting hole of the cabinet, and the circuit breaker cannot be extracted. During the process of inserting the circuit breaker into the cabinet, if the handle 120 is rotated to drive the operating mechanism 140 to act to close the circuit breaker, and if the circuit breaker has not been pushed into place, the buckle 130 is resisted by the inner wall of the cabinet and cannot protrude from the shell 110, thereby limiting the rotation of the handle 120 and preventing the circuit breaker from being closed. In the above manner, the circuit breaker can be prevented from being misoperated during the process of being inserted or extracted into the cabinet, and the safety during use is improved.

[0039] As shown in Figure 1 and Figure 2 The buckle 130 includes a connecting portion 132, a rotating portion 134 and a clamping portion 136 connected in sequence, the rotating portion 134 is rotationally connected with the shell 110, and the connecting portion 132 is hingedly connected with the eccentric position of the handle 120 towards the connecting portion 132, so that when the handle 120 rotates, the buckle 130 is driven to rotate.

[0040] For example, the rotating portion 134 is provided with a rotating shaft or a connecting hole, so that the rotating portion 134 is rotationally connected with the shell 110 through the rotating shaft or the connecting hole. When the buckle 130 is rotationally connected with the shell 110 through the rotating portion 134, in the case that the rotating portion 134 is provided with the rotating shaft, a sleeve can be correspondingly arranged in the shell 110, so that the rotating shaft is inserted into the sleeve, thereby enabling the relative rotation between the buckle 130 and the shell 110. It can be understood that in the case that the rotating portion 134 is provided with the connecting hole, a rotating shaft can be correspondingly arranged in the shell 110, so that the rotating portion 134 is sleeved on the rotating shaft through the connecting hole, thereby enabling the relative rotation between the buckle 130 and the shell 110.

[0041] In addition, by hingedly connecting the connecting portion 132 to the eccentric position of the handle 120 towards the connecting portion 132, when the handle 120 rotates, the eccentric position of the handle 120 rotates around the rotation center of the handle 120, and since the connecting portion 132 is hingedly connected to the eccentric position, when the handle 120 rotates, the eccentric position has a certain displacement amount, thereby driving the rotating portion 134 to shift position, to provide a driving force for rotating the buckle 130. For example, as shown in Figure 1 When the handle 120 reversely rotates to make the operating mechanism 140 perform the opening operation, the lock buckle positively rotates to make the clamping portion 136 retract into the shell 110. When the handle 120 positively rotates to make the operating mechanism 140 perform the closing operation, the lock buckle reversely rotates to make the clamping portion 136 protrude from the shell 110, so that the clamping portion 136 of the buckle 130 cooperates with the limiting hole of the cabinet.

[0042] It can be understood that, in order to ensure that the clamping portion 136 can normally protrude or retract from the shell 110, the clamping portion 136 and the rotating portion 134 have a certain bending transition, so that when the rotating portion 134 rotates, the clamping portion 136 can exactly form the required corresponding relationship with the through hole 112, so that the clamping portion 136 can protrude or retract from the shell 110 at the through hole 112.

[0043] Please continue to refer to Figure 1 and Figure 1 The handle 120 is provided with a connecting arm 122, the connecting arm 122 is provided with a positioning hole 1222, the connecting portion 132 is provided with a slot hole corresponding to the positioning hole 1222, and the locking mechanism 100 further comprises a tripping lever 150, one end of the tripping lever 150 extends out of the shell 110, and the other end is respectively arranged in the positioning hole 1222 and the slot hole.

[0044] Specifically, the present application does not specifically limit the setting position of the handle 120, as long as it can ensure that the buckle 130 and the operating mechanism 140 are driven to act, for example, when the distance between the handle 120 and the buckle 130 is far, the connecting arm 122 can be arranged on the handle 120, to connect the connecting portion 132 of the buckle 130 through the connecting arm 122. The connecting portion 132 and the connecting arm 122 can be connected by a pin shaft, so as to connect the handle 120 and the buckle 130. For example, Figure 1As shown, when the locking mechanism 100 further comprises a tripping pull rod 150, one end of the tripping pull rod 150 extends out of the shell 110, and the other end of the tripping pull rod 150 is respectively arranged in the positioning hole 1222 and the slot hole, so as to be connected with each other through the tripping pull rod 150. By arranging the slot hole at the connecting portion 132, when the handle 120 drives the buckle 130 to rotate, the slot hole at the connecting portion can be bypassed, so as to prevent the handle 120 from being stuck with the buckle 130, and the stability of the connection is improved. In addition, the other end of the tripping pull rod 150 is arranged in the positioning hole 1222 and the slot hole, and simultaneously acts on the handle 120 and the buckle 130, so as to reduce the parts, facilitate assembly, and reduce the cost.

[0045] In addition, by connecting the tripping pull rod 150 with the connecting arm 122 and the connecting portion 132 respectively, the handle 120 can also be driven to rotate through the tripping pull rod 150, so as to realize the required transmission relationship. For example, by arranging the tripping pull rod 150, when the tripping pull rod 150 is pulled, the handle 120 can be driven to act, the operating mechanism 140 is tripped, and the buckle 130 is retracted into the shell 110. When it is required to pull out the circuit breaker 200 from the cabinet, the tripping pull rod 150 can be used to apply force, so as to facilitate the operation of the operator, thereby reducing the operation difficulty. It can be understood that the tripping pull rod 150 can also be pushed into the shell 110, so that the handle 120 reversely acts, the closing operation of the operating mechanism 140 is realized, and the tripping and closing operations are realized through the tripping pull rod 150 in special situations (such as the fracture of the force application position of the handle 120).

[0046] As shown in Figure 3 and Figure 4 In the optional embodiment of the present application, the buckle 130 is a sliding block, the sliding block is slidably connected with the shell 110, and the sliding block is connected with the handle 120 through the connecting rod 160; when the handle 120 rotates, the sliding block is driven to slide along the shell 110, so that the sliding block extends out of or retracts into the shell 110.

[0047] Specifically, through the sliding block connected with the handle 120, when the handle 120 rotates forward or reversely, the sliding block is driven to synchronously act, so that in the tripped state, the sliding block retracts into the shell 110, and in the closed state, the sliding block extends out of the shell 110 through the through hole 112. Since the handle 120 is connected with the sliding block through the connecting rod 160, the handle 120 can act on the sliding block to drive the sliding block to act. Similarly, the sliding block can also act on the handle 120 reversely, for example, when the sliding block is limited by the inner wall of the cabinet and cannot extend out of the shell 110, the handle 120 is blocked by the sliding block and cannot drive the operating mechanism 140 to perform the closing operation, so as to ensure the safety during use.

[0048] As shown in Figure 3As shown, the sliding block is provided with a first connecting hole 138, the handle 120 is provided with a second connecting hole 124, and the two ends of the connecting rod 160 are connected to the first connecting hole 138 and the second connecting hole 124 respectively, so that the connecting rod 160 is hinged to the sliding block and the handle 120 respectively.

[0049] Specifically, by using the above form, when assembling, the two ends of the connecting rod 160 are directly matched with the first connecting hole 138 and the second connecting hole 124 respectively, which is beneficial to reduce the assembly difficulty. It can be understood that the two ends of the connecting rod 160 can be respectively provided with a bent head to facilitate assembly alignment. In addition, by hinging the connecting rod 160 to the sliding block and the handle 120 respectively, the required connection relationship is established, avoiding the jamming between the sliding block and the handle 120, which is beneficial to improve the stability during use.

[0050] As shown in Figure 3 and Figure 4 , the handle 120 is provided with an auxiliary pull rod 170, one end of the auxiliary pull rod 170 extends out of the shell 110, and the other end is hinged to the handle 120. Pulling the auxiliary pull rod 170 makes the handle 120 rotate to separate the operating mechanism 140.

[0051] Specifically, the auxiliary pull rod 170 facilitates the application of force when the circuit breaker is pulled out of the shell 110. In order to ensure that the circuit breaker is in the open state when the auxiliary pull rod 170 is pulled out to pull out the circuit breaker, the hinged position of the auxiliary pull rod 170 and the handle 120 needs to be set at the position where the handle 120 is rotated when the force is applied to the handle 120, and the direction of rotation can make the circuit breaker open. At the same time, when the handle 120 rotates to make the circuit breaker open, the handle 120 drives the buckle 130 to act, so that the buckle 130 retracts into the shell 110, ensuring that the circuit breaker can be smoothly pulled out.

[0052] As shown in Figure 3 and Figure 4 , in the optional embodiment of the present application, the handle 120 includes a rotating body 126 and a knob 127 arranged on the rotating body 126.

[0053] Specifically, when the handle 120 adopts the rotating body 126 and the knob 127 arranged on the rotating body 126, when the handle 120 needs to be rotated, the knob 127 can be directly pushed. When the handle 120 rotates, the opening or closing operation of the circuit breaker 200 can be controlled, and the buckle 130 can be retracted or protruded from the shell 110.

[0054] As shown in Figure 5 , Figure 6 and Figure 7As shown, in an optional embodiment of this application, the handle 120 includes a rotating body 126, and a first pressing part 128 and a second pressing part 129 disposed opposite to each other on the rotating body 126.

[0055] When the handle 120 adopts a rotating body 126, and has a first pressing part 128 and a second pressing part 129 on the rotating body 126, when the handle 120 needs to be rotated, it is only necessary to press the first pressing part 128 or the second pressing part 129. When the handle 120 is rotated, the opening or closing operation of the circuit breaker 200 can be controlled, and the latch 130 can be retracted or protruded from the housing 110 at the same time.

[0056] like Figure 7 and Figure 8 As shown, in an optional embodiment of this application, a manual pull rod 180 is provided on the housing 110. The manual pull rod 180 is mainly used to facilitate applying force to the circuit breaker when pulling it out of the chassis, thereby reducing the difficulty of operation. Using the above method, when the circuit breaker is in the open state, the latch 130 retracts into the housing 110, releasing the locking state between it and the chassis, so that the circuit breaker can be smoothly pulled out by the manual pull rod 180.

[0057] like Figure 9 As shown in the illustration, this application also discloses a circuit breaker 200, including the locking mechanism 100 from the foregoing embodiments, and an operating mechanism 140 disposed within a housing 110, the operating mechanism 140 being connected to a handle 120. This circuit breaker 200 incorporates the same structure and beneficial effects as the locking mechanism 100 from the foregoing embodiments. The structure and beneficial effects of the locking mechanism 100 have been described in detail in the foregoing embodiments and will not be repeated here.

[0058] like Figure 9 As shown, a short-circuit protector 210 is also provided inside the housing 110. The short-circuit protector 210 and the operating mechanism 140 are located on opposite sides of the width direction of the housing 110, and the short-circuit protector 210 is arranged along the width direction of the circuit breaker 200. An input terminal 220 and an output terminal 230 are also provided on one side of the length direction of the housing 110, wherein the input terminal 220 is connected to the moving contact and the output terminal 230 is connected to the stationary contact.

[0059] Specifically, the short-circuit protector 210 is mainly used for short-circuit protection of the load circuit. When the current in the load circuit in series with the circuit breaker 200 suddenly increases to a preset value, the short-circuit protector 210 acts to make the operating mechanism 140 perform the tripping operation to protect the circuit. By respectively arranging the short-circuit protector 210 and the operating mechanism 140 on opposite sides of the shell 110 in the width direction of the circuit breaker 200, and arranging the short-circuit protector 210 along the width direction of the circuit breaker 200, the limited space in the shell 110 can be fully utilized, and the compactness between the short-circuit protector 210 and the operating mechanism 140 is improved, so as to reduce the volume of the circuit breaker 200.

[0060] In addition, the input terminal 220 and the output terminal 230 are respectively arranged on one side of the shell 110 in the length direction. When the circuit breaker 200 is inserted into the cabinet, the required electrical connection relationship can be completed. Compared with the structure in which the input terminal and the output terminal are respectively arranged on opposite sides of the shell in the conventional form, the wiring is omitted, the operation difficulty is reduced, and the convenience during use is improved. It can be understood that the input terminal 220 can be connected with the static contact, and the output terminal 230 can be connected with the moving contact.

[0061] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A locking mechanism, characterized in that The locking mechanism comprises a shell, a handle and a buckle arranged in the shell, the handle is rotationally connected with the shell, and the handle is connected with the buckle, a through hole is arranged on the shell, the buckle is retracted into the shell when the handle drives the operating mechanism to be open, and the buckle protrudes from the shell through the through hole when the handle drives the operating mechanism to be closed. The buckle comprises a connecting portion, a rotating portion and a clamping portion which are sequentially connected, the rotating portion is rotationally connected with the shell, and the connecting portion is hingedly connected with the eccentric position of the handle towards the connecting portion, so that the handle drives the buckle to rotate when the handle rotates. A connecting arm is arranged on the handle, a positioning hole is arranged on the connecting arm, the connecting portion is provided with a slot hole corresponding to the positioning hole, and the locking mechanism further comprises a tripping lever, one end of the tripping lever protrudes from the shell, and the other end of the tripping lever is arranged in the positioning hole and the slot hole respectively.

2. The locking mechanism of claim 1, wherein, The buckle is a sliding block, the sliding block is slidingly connected with the shell, and the sliding block is connected with the handle through a connecting rod; the handle drives the sliding block to slide along the shell when the handle rotates, so that the sliding block protrudes from or is retracted into the shell.

3. The locking mechanism of claim 2, wherein, A first connecting hole is arranged on the sliding block, a second connecting hole is arranged on the handle, and two ends of the connecting rod are connected in the first connecting hole and the second connecting hole respectively, so that the connecting rod is hingedly connected with the sliding block and the handle respectively.

4. A locking mechanism according to claim 2 or 3, characterised in that, An auxiliary pulling rod is arranged on the handle, one end of the auxiliary pulling rod protrudes from the shell, and the other end of the auxiliary pulling rod is hingedly connected with the handle; the handle rotates when the auxiliary pulling rod is pulled, so that the operating mechanism is open.

5. A locking mechanism according to claim 2 or 3, characterised in that, The handle comprises a rotating body and a knob arranged on the rotating body, or the handle comprises a rotating body and a first pressing portion and a second pressing portion which are oppositely arranged on the rotating body.

6. The locking mechanism of any one of claims 1-3, wherein, A manual pulling rod is arranged on the shell.

7. A circuit breaker characterized by, The locking mechanism comprises the handle and the buckle according to any one of claims 1-6, and an operating mechanism arranged in the shell, the operating mechanism is connected with the handle.

8. The circuit breaker of claim 7, wherein, A short-circuit protector is further arranged in the shell, the short-circuit protector and the operating mechanism are located on opposite sides of the shell in the width direction, and the short-circuit protector is arranged along the width direction of the circuit breaker; an input terminal and an output terminal are further arranged on one side of the shell in the length direction, the input terminal is connected with a moving contact, and the output terminal is connected with a stationary contact.

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