Residual-current circuit breaker

Abstract

The invention provides a residual-current circuit breaker, relates to the technical field of switches, and is used for improving the use reliability of the residual-current circuit breaker and improving the power utilization safety. The residual-current circuit breaker comprises a shell, a static contact, a moving contact, a first driving structure and a second driving structure, the moving contact has a contact position and a separation position relative to the shell, and a linkage shaft of the first driving structure and the moving contact move synchronously. The linkage shaft is provided with a first position and a second position relative to the shell, and when the linkage shaft is located at the first position, the moving contact is located at the contact position. When the linkage shaft is in the second position, the moving contact is in the disengagement position. A driving limiting piece of the second driving structure is provided with a driving position and a limiting position relative to the shell. When the driving limiting piece is located at the driving position, the linkage shaft is allowed to be switched between the first position and the second position, and when the driving limiting piece is located at the limiting position, the linkage shaft is located at the second position, and the driving limiting piece limits the linkage shaft to be switched from the second position to the first position.

Description

Technical Field

[0001] The present application relates to the technical field of switches, and in particular to a leakage circuit breaker. Background Art

[0002] The leakage circuit breaker generally includes a leakage protection module and a circuit breaker body. The circuit breaker body includes a handle, a moving contact and a stationary contact. When the moving contact contacts the stationary contact, the handle is in the closed position, the leakage circuit breaker is closed, and the circuit where the leakage circuit breaker is located is connected. When leakage occurs in the circuit where the leakage circuit breaker is located, the operating mechanism of the leakage protection module is activated, driving the moving contact to rotate away from the stationary contact, the leakage circuit breaker is disconnected, and the circuit where the leakage circuit breaker is located is disconnected. At this time, the handle is in the disconnected position.

[0003] In the prior art, after eliminating the cause of leakage, when the leakage circuit breaker needs to be closed, the handle on the circuit breaker body can be directly operated to switch the handle from the open position to the closed position, and further, the moving contact is brought into contact with the static contact.

[0004] At this time, the leakage protection module may still be in the disconnected state. That is, when the circuit breaker body is in the closed state, the leakage protection module is still in the disconnected state.

[0005] In this case, when leakage occurs again, the leakage protection module cannot drive the circuit breaker body to disconnect, posing a safety hazard. Summary of the invention

[0006] The present application provides a leakage circuit breaker for improving the reliability of the leakage circuit breaker and improving the safety of electricity use.

[0007] In order to achieve the above-mentioned purpose, the present application provides a leakage circuit breaker, including a housing, a static contact, a moving contact, a first drive structure and a second drive structure, wherein the static contact is arranged on the housing. The moving contact is rotatably arranged on the housing. The moving contact has a contact position and a disengagement position relative to the housing, and when the moving contact is in the contact position, the moving contact is in contact with the static contact. When the moving contact is in the disengagement position, the moving contact is disengaged from the static contact. The moving contact is arranged at the driving end of the first drive structure, and the first drive structure is used to drive the moving contact to rotate and switch between the contact position and the disengagement position. The first drive structure has a linkage shaft, and the linkage shaft moves synchronously with the moving contact. The linkage shaft has a first position and a second position relative to the housing, and when the linkage shaft is in the first position, the moving contact is in the contact position. When the linkage shaft is in the second position, the moving contact is in the disengagement position. The second drive structure is arranged on the housing, and the second drive structure includes a drive limiter, and the drive limiter has a drive position and a limit position relative to the housing. When the driving limiter is in the driving position, the linkage shaft is allowed to switch between the first position and the second position, and when there is leakage current in the circuit where the leakage circuit breaker is located, the driving limiter drives the linkage shaft to rotate and switch from the first position to the second position. When the driving limiter is in the limiting position, the linkage shaft is in the second position, and the driving limiter limits the linkage shaft from switching from the second position to the first position.

[0008] When the above technical solution is adopted, the driving limiter has a driving position and a limiting position relative to the housing. When the driving limiter is in the driving position and there is leakage current in the circuit where the leakage circuit breaker is located, the driving limiter can drive the linkage shaft to rotate from the first position to the second position, and further drive the moving contact to rotate from the contact position to the disengaged position. When leakage current occurs in the circuit where the leakage circuit breaker is located, the current in the circuit where the leakage circuit breaker is located can be cut off in time to avoid serious consequences such as electric shock to human body, electric sparks or even fire.

[0009] Moreover, when there is leakage current in the circuit where the leakage circuit breaker is located, the second driving structure can drive the linkage shaft to rotate and switch from the first position to the second position. That is, under the action of the second driving structure, the driving limiter is in the restricted position, the linkage shaft is in the second position, and after the moving contact is switched from the contact position to the disengaged position, the driving limiter can limit the linkage shaft from switching from the second position to the first position.

[0010] At this time, under the action of the second driving structure, the linkage shaft cannot switch from the second position to the first position. Furthermore, the moving contact cannot switch from the disengaged position to the contact position. In other words, due to the blocking restriction of the driving limiter in the restricted position, even if the operator operates the first driving structure, the moving contact cannot switch from the disengaged position to the contact position.

[0011] When leakage current appears again in the circuit where the leakage circuit breaker is located, the second driving structure can be controlled so that the driving limit member switches from the driving position to the limiting position. During the process of switching the driving limit member from the driving position to the limiting position, the driving limit member can drive the linkage shaft to rotate from the first position to the second position.

[0012] The leakage circuit breaker provided in the embodiment of the present application, after leakage occurs, after investigation, when the leakage circuit breaker needs to be started again, it is necessary to first control the second drive structure so that the drive limiter switches from the limit position to the drive position. Then, the first drive structure can be operated to control the moving contact to switch from the disengaged position to the contact position to connect the current of the circuit where the leakage circuit breaker is located. When leakage occurs once, it can avoid the phenomenon that the operator directly operates the first drive structure to connect the circuit where the leakage circuit breaker is located. When the leakage circuit breaker leaks again, the second drive structure cannot drive the linkage shaft to rotate and switch from the first position to the second position. It can improve the reliability of the use of the leakage circuit breaker and improve the safety of electricity use.

[0013] In a possible implementation, the leakage circuit breaker further includes a detection module and a control module, wherein the detection module is used to detect the leakage current of the circuit where the leakage circuit breaker is located and generate a leakage current signal. The control module is electrically connected to the detection module and the second driving structure, and the control module is used to receive the leakage current signal and control the second driving structure to operate according to the leakage current signal.

[0014] When the above technical solution is adopted, the setting of the detection module and the control module can timely detect the leakage current in the circuit where the leakage circuit breaker is located. When the leakage current is large, the circuit can be cut off in time, which plays a role of protection and monitoring and improves the safety of electricity use.

[0015] In a possible implementation, the drive limiter includes a drive portion and a limiter portion, and when the linkage shaft is in the first position, the linkage shaft contacts the drive portion. When there is leakage current in the circuit where the leakage circuit breaker is located, the drive assembly included in the second drive structure drives the drive limiter to switch from the drive position to the limit position, and the drive portion is used to drive the linkage shaft to switch from the first position to the second position. When the drive limiter is in the limit position, the limiter portion contacts the linkage shaft in the second position, and the limiter portion is used to limit the linkage shaft from switching from the second position to the first position.

[0016] When the above technical solution is adopted, the surface of the driving part used for contacting the linkage shaft is an inclined surface. When leakage occurs, the control module controls the driving component to drive the driving limiter to move in the direction from the driving part to the supporting part, so that the driving limiter switches from the driving position to the limiting position. In the process of switching the driving limiter from the driving position to the limiting position, the driving part drives the linkage shaft to move upward along the inclined surface, so that the linkage shaft switches from the first position to the second position, and further, the moving contact switches from the contact position to the disengaged position.

[0017] Furthermore, when the linkage shaft is in the second position, the linkage shaft is located above the limiting portion, and the limiting portion can prevent the linkage shaft from switching from the second position to the first position.

[0018] In a possible implementation, the second driving structure further includes a blocking limiter and a first elastic member, wherein the blocking limiter is slidably disposed on the housing, and the blocking limiter has a limit hole. The two ends of the first elastic member elastically act on the housing and the blocking limiter, respectively, to apply a force to the blocking limiter away from the linkage shaft.

[0019] The driving limiter also includes a protrusion matched with the limit hole, and when the driving limiter is in the driving position, the protrusion extends into the limit hole. When the driving limiter is in the limiting position, the protrusion escapes from the limit hole and is blocked and limited on the wall surface of the blocking limiter.

[0020] The housing has a housing cavity, and the driving assembly includes a leakage tripping coil, a moving iron core, and a second elastic member. The leakage tripping coil is arranged in the housing cavity. The moving iron core is axially sleeved in the leakage tripping coil, and the driving limit member is arranged at one end of the moving iron core. When there is leakage current in the circuit where the leakage circuit breaker is located, the moving iron core drives the driving limit member to switch from the driving position to the limiting position. The second elastic member is arranged in the housing cavity, and the two ends of the second elastic member elastically act on the housing and the moving iron core respectively, so as to apply a force close to the linkage shaft to the moving iron core.

[0021] When the above technical solution is adopted, when the residual current circuit breaker is in the closed state, the linkage shaft is in the first position. Under the action of the second elastic member, the moving iron core has a force to approach the linkage shaft, the driving limiter is in the driving position, the protrusion extends into the limit hole, and the driving part contacts the linkage shaft.

[0022] When leakage occurs in the circuit where the leakage circuit breaker is located, the detection module can monitor the leakage current of the circuit where the leakage circuit breaker is located, generate a leakage current signal, and transmit the leakage current signal to the control module. After receiving the leakage current signal, the control module compares it with the pre-stored leakage current threshold. When the leakage current detected by the detection module is greater than the leakage current threshold, the leakage trip coil is energized to generate a magnetic field force, driving the moving iron core to move in the direction close to the second elastic member, so that the second elastic member is further compressed. At the same time, the moving iron core drives the drive limit member to move in the direction close to the second elastic member, so that the drive limit member switches from the driving position to the limiting position.

[0023] When the limiter is driven to switch from the driving position to the limiting position, the protrusion escapes from the limiting hole, preventing the limiter from moving away from the linkage shaft under the action of the first elastic member. At the same time, the linkage shaft moves upward along the inclined surface of the driving part, driving the linkage shaft to switch from the first position to the second position.

[0024] At this time, the moving contact switches from the contact position to the disengaged position, the current in the circuit where the leakage circuit breaker is located is disconnected, and the leakage circuit breaker is in the disconnected state. At the same time, the leakage trip coil is de-energized, the electromagnetic force disappears, and the moving iron core has a force to approach the linkage shaft under the action of the second elastic member. Furthermore, the protrusion of the drive limit member has a force to approach the linkage shaft, and the protrusion is limited on the wall surface of the blocking limit member. The drive limit member is in the restricted position, and the limit member blocks the linkage shaft from switching from the second position to the first position.

[0025] In a possible implementation, when the driving limiting member is in the limiting position, one end of the blocking limiting member protrudes from the housing.

[0026] When the above technical solution is adopted, the blocking limiter partially extends out of the shell, which is convenient for informing the operator that the leakage circuit breaker has tripped and disconnected the circuit due to a leakage fault, and the cause of the leakage fault needs to be checked.

[0027] In a possible implementation, the detection module includes a zero-sequence current transformer, which is used to detect the leakage current of the circuit where the leakage circuit breaker is located and generate a leakage current signal.

[0028] In a possible implementation, the first driving structure includes a handle, a connecting rod, a support frame, a locking assembly and a contact support, and the handle is rotatably arranged on the housing. The handle has an open position and a closed position relative to the housing, and when the handle is in the open position, the moving contact is in a disengaged position. When the handle is in the closed position, the moving contact is in a contact position. One end of the connecting rod is rotatably connected to the handle. The support frame is rotatably arranged on the housing. The locking assembly is rotatably arranged on the support frame. The other end of the connecting rod is rotatably arranged on the locking assembly. The linkage shaft is movably arranged on the locking assembly. The contact support is movably arranged on the support frame, and the moving contact is movably arranged on the contact support.

[0029] When the above technical solution is adopted, when the handle is turned, one end of the connecting rod rotatably connected to the handle rotates with the handle, and further, the position of the other end of the connecting rod rotatably connected to the lock assembly changes relative to the housing, and the lock assembly rotates relative to the housing. The linkage shaft rotates synchronously relative to the housing. When the handle continues to be turned, the support frame is driven to rotate relative to the housing, and further, the moving contact is driven to move in a direction close to or away from the static contact, so that the moving contact switches between the contact position and the disengaged position.

[0030] In a possible implementation, the first driving structure further includes a third elastic member disposed on the housing, wherein two ends of the third elastic member elastically act on the support frame and the contact support respectively, and are used to apply a torque force to the moving contact to approach the static contact.

[0031] When the above technical solution is adopted, the movable contact and the stationary contact are in elastic contact, which can improve the contact stability between the movable contact and the stationary contact.

[0032] In a possible implementation, the lock assembly includes a jumper and a lock, wherein the jumper is rotatably arranged on a support frame, the other end of the connecting rod is rotatably arranged on the jumper, the lock is rotatably arranged on the support frame, the lock has a locking part, one end of the locking part is located on the rotation track of the jumper, and the linkage shaft is rotatably arranged on the lock.

[0033] In a possible implementation, the first driving structure further includes a rotating shaft and a fourth elastic member, wherein the rotating shaft is disposed on the housing. The axis of the rotating shaft is colinear with the rotating axis of the support frame. The two ends of the fourth elastic member elastically act on the rotating shaft and the lock buckle respectively, so as to apply a force to the locking portion to approach the jump buckle.

[0034] When the above technical solution is adopted, the stability of the lock buckle and the jump buckle when locked can be ensured, and the firmness of the contact between the moving contact and the static contact can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the leakage circuit breaker provided in the embodiment of the present application Figure 1 .

[0036] Figure 2 Schematic diagram of the leakage circuit breaker provided in the embodiment of the present application Figure 2 .

[0037] Figure 3 A partial schematic diagram of a leakage circuit breaker provided in an embodiment of the present application in an off state Figure 1 .

[0038] Figure 4 A partial schematic diagram of a leakage circuit breaker provided in an embodiment of the present application in a closed state Figure 1 .

[0039] Figure 5 A partial schematic diagram of a leakage circuit breaker provided in an embodiment of the present application in an off state Figure 2 .

[0040] Figure 6 A partial schematic diagram of a leakage circuit breaker provided in an embodiment of the present application in an off state Figure 3 .

[0041] Figure 7 A partial schematic diagram of a leakage circuit breaker provided in an embodiment of the present application in a closed state Figure 2 .

[0042] Figure 8 A partial cross-sectional schematic diagram of the leakage circuit breaker provided in an embodiment of the present application when in a disconnected state.

[0043] Fig. 9 A schematic diagram of a drive limiter in an example provided in an embodiment of the present application.

[0044] Fig.10 A schematic diagram of a blocking and limiting member provided in an embodiment of the present application.

[0045] Description of reference numerals:

[0046] 1-housing, 12-first housing, 13-second housing, 2-static contact, 3-moving contact, 4-first driving structure,

[0047] 41- linkage shaft, 42- handle, 43- connecting rod, 44- support frame, 45- lock assembly, 451- lock, 452- jump buckle,

[0048] 46-contact support, 47-third elastic member, 48-rotation shaft, 49-fourth elastic member, 5-second driving structure,

[0049] 51-driving assembly, 511-leakage tripping coil, 512-moving iron core, 513-second elastic member, 52-driving limit member,

[0050] 521 - driving part, 522 - limiting part, 523 - protruding part, 53 - blocking and limiting member, 531 - limiting hole. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions.

[0053] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiments" in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0054] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the leakage circuit breaker of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present application.

[0055] In addition, the terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0056] In the description of the present application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two groups (including two).

[0057] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, the "connection" or "connection" of a mechanical structure may refer to a physical connection. For example, the physical connection may be a fixed connection, such as a fixed connection through a barrier, such as a fixed connection through screws, bolts or other barrier; the physical connection may also be a detachable connection, such as a mutual snap-on or snap-fit ​​connection; the physical connection may also be an integral connection, such as a connection formed by welding, bonding or integral molding. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0058] See also Figures 1 to 6 As shown, an embodiment of the present application provides a leakage circuit breaker, including a housing 1, a static contact 2, a moving contact 3, a first driving structure 4 and a second driving structure 5, wherein the static contact 2 is arranged on the housing 1.

[0059] In a specific implementation, the housing 1 may include a first housing 12 and a second housing 13 adjacent to each other. The first housing 12 and the second housing 13 may be fixed together by bonding, welding, or clamping.

[0060] Of course, in practice, the connection method between the first shell 12 and the second shell 13 is not limited thereto.

[0061] In addition, the material and specific structure of the first shell 12 and the second shell 13 are not specifically limited here.

[0062] The stationary contact 2, the moving contact 3 and the first driving structure 4 are mounted on the first housing 12. Figures 3 to 5 The second driving structure 5 is mounted on the second housing 13, as shown. Figure 6 and Figure 7 shown.

[0063] Specifically, the stationary contact 2 can be fixedly installed in the first housing 12, and the stationary contact 2 can be fixedly installed on the first housing 12 by welding, bonding or screws. The structure of the stationary contact 2 is not specifically limited here, and is subject to actual conditions.

[0064] The movable contact 3 is rotatably disposed in the housing 1. In fact, the movable contact 3 is rotatably disposed in the cavity of the first housing 12. The movable contact 3 can rotate relative to the housing 1. During the rotation of the movable contact 3 relative to the housing 1, the movable contact 3 has a contact position and a disengagement position relative to the housing 1.

[0065] When the moving contact 3 is in the contact position, the moving contact 3 is in contact with the stationary contact 2. Figure 4 At this time, the leakage circuit breaker provided by the embodiment of the present application is in a closed state.

[0066] When the moving contact 3 is in the disengaged position, the moving contact 3 is out of contact with the stationary contact 2. Figure 3 At this time, the leakage circuit breaker provided by the embodiment of the present application is in a disconnected state.

[0067] See also Figure 3 and Figure 4 As shown, the first driving structure 4 is mounted on the first housing 12. The moving contact 3 is arranged at the driving end of the first driving structure 4, and the first driving structure 4 is used to drive the moving contact 3 to rotate and switch between the contact position and the disengagement position.

[0068] The first driving structure 4 can drive the moving contact 3 to rotate relative to the housing 1. When the first driving structure 4 drives the moving contact 3 to rotate in a direction close to the stationary contact 2 until the moving contact 3 contacts the stationary contact 2, the moving contact 3 is in a contact position. When the first driving structure 4 drives the moving contact 3 to rotate in a direction away from the stationary contact 2 until the moving contact 3 contacts the stationary contact 2, the moving contact 3 is in a disengaged position.

[0069] In one possible implementation, see Figure 3 and Figure 4 As shown, the first driving structure 4 has a linkage shaft 41, and the linkage shaft 41 moves synchronously with the moving contact 3. When the moving contact 3 rotates relative to the housing 1, the linkage shaft 41 and the moving contact 3 rotate synchronously relative to the housing 1.

[0070] During the rotation of the linkage shaft 41 relative to the housing 1, the linkage shaft 41 has a first position and a second position relative to the housing 1. Figure 4 As shown, when the linkage shaft 41 is in the first position, the moving contact 3 is in the contact position. Figure 3 As shown, when the linkage shaft 41 is in the second position, the moving contact 3 is in the disengaged position.

[0071] Specifically, Figure 3 and Figure 4 As an example, when the linkage shaft 41 switches from the second position to the first position, that is, the linkage shaft 41 switches from the second position to the first position. Figure 3 The position shown is Figure 4 During the position switching process shown, the linkage shaft 41 rotates clockwise, and the moving contact 3 rotates clockwise synchronously, and the moving contact 3 switches from the disengaged position to the contact position.

[0072] It can be understood that the moving contact 3 switches between the contact position and the disengagement position under the action of the first driving structure 4. The linkage shaft 41 belongs to the first driving structure 4, and the linkage shaft 41 moves synchronously with the moving contact 3. Therefore, the movement of the moving contact 3 can be controlled by controlling the movement of the linkage shaft 41.

[0073] Specifically, when the moving contact 3 is in the contact position and the linkage shaft 41 is in the first position, the linkage shaft 41 can be controlled so that the linkage shaft 41 switches from the first position to the second position to switch the moving contact 3 from the contact position to the disengaged position.

[0074] The second driving structure 5 is disposed on the housing 1, specifically, the second driving structure 5 is disposed on the second housing 13. In fact, one end of the linkage shaft 41 passes through the first housing 12 and then extends into the cavity of the second housing 13, so that the second driving structure 5 contacts the linkage shaft 41, and the second driving structure 5 is drivingly connected to the linkage shaft 41.

[0075] It should be noted that the second drive structure 5 is drivingly connected to the linkage shaft 41, that is, the second drive structure 5 can drive the linkage shaft 41 to rotate relative to the housing 1, so that the linkage shaft 41 rotates from the first position to the second position, and further drives the moving contact 3 to switch from the contact position to the disengaged position.

[0076] In actual situations, the driving limiter 52 has a driving position and a limiting position relative to the housing 1. When the driving limiter 52 is in the driving position and there is leakage current in the circuit where the leakage circuit breaker is located, the driving limiter 52 can drive the linkage shaft 41 to rotate from the first position to the second position, and further drive the moving contact 3 to rotate from the contact position to the disengaged position. When leakage current occurs in the circuit where the leakage circuit breaker is located, the current in the circuit where the leakage circuit breaker is located can be cut off in time to avoid serious consequences such as electric shock to human body, electric sparks or even fire.

[0077] Moreover, when there is leakage current in the circuit where the leakage circuit breaker is located, the linkage shaft 41 can be driven to rotate and switch from the first position to the second position under the action of the second driving structure 5. That is, under the action of the second driving structure 5, the driving limiter 52 is in the restricted position, the linkage shaft 41 is in the second position, and after the moving contact 3 is switched from the contact position to the disengaged position, the driving limiter 52 can limit the linkage shaft 41 from switching from the second position to the first position.

[0078] At this time, under the limiting effect of the second driving structure 5, the linkage shaft 41 cannot be switched from the second position to the first position. Furthermore, the moving contact 3 cannot be switched from the disengaged position to the contact position. In other words, due to the blocking limit of the driving limiter 52 in the limiting position, even if the operator operates the first driving structure 4, the moving contact 3 cannot be switched from the disengaged position to the contact position.

[0079] Of course, in actual situations, the operator can operate the second drive structure 5 to switch the drive limiter 52 from the restricted position to the drive position. When the drive limiter 52 is in the drive position, the linkage shaft 41 is allowed to switch between the first position and the second position. At this time, the operator can directly operate the first drive structure 4 to switch the moving contact 3 from the disengaged position to the contact position, so that the current in the circuit where the leakage circuit breaker is located is connected. In addition, when the drive limiter 52 is in the drive position, the operator can also directly operate the first drive structure 4 to switch the moving contact 3 from the contact position to the disengaged position without being interfered with by the drive limiter 52.

[0080] When leakage current appears again in the circuit where the leakage circuit breaker is located, the second driving structure 5 can be controlled so that the driving limit member 52 switches from the driving position to the limiting position. In the process of switching the driving limit member 52 from the driving position to the limiting position, the driving limit member 52 can drive the linkage shaft 41 to rotate from the first position to the second position.

[0081] It is understandable that in the embodiment provided in the present application, when the moving contact 3 is in the contact position, the linkage shaft 41 is in the first position, and the drive limiter 52 is in the drive position. Correspondingly, when the moving contact 3 is in the disengaged position, the linkage shaft 41 is in the second position, and the drive limiter 52 is in the restricted position.

[0082] The leakage circuit breaker provided in the embodiment of the present application, after leakage occurs, after investigation, when the leakage circuit breaker needs to be started again, it is necessary to first control the second drive structure 5 so that the drive limit member 52 switches from the limit position to the drive position. Then, the first drive structure 4 can be operated to control the moving contact 3 to switch from the disengaged position to the contact position, and connect the current of the circuit where the leakage circuit breaker is located. When a leakage occurs once, it can avoid the phenomenon that the operator directly operates the first drive structure 4 to connect the circuit where the leakage circuit breaker is located. When the leakage circuit breaker has leakage again, the second drive structure 5 cannot drive the linkage shaft 41 to rotate and switch from the first position to the second position. It can improve the reliability of the use of the leakage circuit breaker and improve the safety of electricity use.

[0083] In some embodiments, the leakage circuit breaker provided in the embodiments of the present application further includes a detection module and a control module, wherein the detection module is used to detect the leakage current of the circuit in which the leakage circuit breaker is located and generate a leakage current signal. The control module is electrically connected to the detection module and the second driving structure 5, and the control module is used to receive the leakage current signal and control the second driving structure 5 to operate according to the leakage current signal.

[0084] During specific implementation, the detection module is electrically connected to the control module, and the control module is also electrically connected to the second drive structure 5. When a leakage fault occurs in the circuit where the leakage circuit breaker is located, the detection module can detect the leakage current and generate a leakage current signal based on the leakage current. Since the detection module is electrically connected to the control module, the detection module can transmit the leakage current signal to the control module. After receiving the leakage current signal, the control module compares it with the pre-stored leakage current threshold. When the leakage current detected by the detection module is greater than the leakage current threshold, the control module sends a control signal to the second drive structure 5 to control the second drive structure 5 to operate, so that the drive limit member 52 switches from the driving position to the limiting position. The drive limit member 52 can drive the linkage shaft 41 to rotate and switch from the first position to the second position, so that the moving contact 3 switches from the contact position to the disengaged position, disconnecting the current of the circuit where the leakage circuit breaker is located.

[0085] The setting of the detection module and the control module can timely detect the leakage current in the circuit where the leakage circuit breaker is located. When the leakage current is large, the circuit can be cut off in time to play a role of protection and monitoring and improve the safety of electricity use.

[0086] In a specific implementation, the detection module may include a zero-sequence current transformer, which is used to detect the leakage current of the circuit where the leakage circuit breaker is located and generate a leakage current signal.

[0087] As a possible implementation, Figures 6 to 9 As shown, the driving limiter 52 includes a driving portion 521 and a limiter 522. When the linkage shaft 41 is in the first position, the linkage shaft 41 contacts the driving portion 521. When there is leakage current in the circuit where the leakage circuit breaker is located, the driving assembly 51 included in the second driving structure 5 drives the driving limiter 52 to switch from the driving position to the limiting position, and the driving portion 521 is used to drive the linkage shaft 41 to switch from the first position to the second position.

[0088] When the driving limit member 52 is in the limiting position, the limiting portion 522 contacts the linkage shaft 41 in the second position, and the limiting portion 522 is used to limit the linkage shaft 41 from switching from the second position to the first position. Figure 6 .

[0089] When implementing it, Figures 6 to 9 As shown, the driving limiter 52 also includes a support portion, which is fixedly mounted on the driving end of the driving assembly 51. The surface of the driving portion 521 for contacting the linkage shaft 41 is an inclined surface, and the inclined surface is inclined upward from the support portion to the driving portion 521.

[0090] like Figure 7 As shown, the leakage circuit breaker is in a closed state, and the linkage shaft 41 is in the first position. At this time, the linkage shaft 41 is in contact with the driving part 521, and the linkage shaft 41 is in contact with the lower end of the inclined surface.

[0091] When leakage occurs, the control module controls the driving component 51 to drive the driving limiter 52 to move along the direction from the driving part 521 to the supporting part, that is, the driving component 51 drives the driving limiter 52 to move leftward, so that the driving limiter 52 moves from the driving part 521 to the supporting part. Figure 7 The drive position shown is switched to Figure 6 In the process of driving the limit member 52 to switch from the driving position to the limiting position, the driving part 521 drives the linkage shaft 41 to move upward along the inclined surface, so that the linkage shaft 41 moves from the driving position to the limiting position. Figure 7 and Figure 4 The first position shown is switched to Figure 6 and Figure 3 The second position shown, further, the moving contact 3 from Figure 4 The contact position shown is switched to Figure 3 Disengaged position shown.

[0092] Furthermore, if Figure 6 As shown, when the linkage shaft 41 is in the second position, the linkage shaft 41 is located above the limiting portion 522. The limiting portion 522 can prevent the linkage shaft 41 from switching from the second position to the first position.

[0093] In addition, it should be noted that Figure 7 As shown, when the driving limit member 52 is in the driving position, the linkage shaft 41 is allowed to switch between the first position and the second position.

[0094] In a specific implementation, the support portion may be a plate-shaped structure, and the limiting portion 522 may be a boss disposed on the top of the driving portion 521 . Of course, the invention is not limited thereto.

[0095] In one example, the driving component 51 may be a mechanical structure capable of achieving reciprocating motion, such as a linear module or a driving cylinder.

[0096] When the driving assembly 51 is a linear module, the track of the linear module can be installed on the second housing 13, and the driving limiter 52 can be installed on the slider of the linear module indirectly or directly. When leakage current occurs in the circuit where the residual current circuit breaker is located, the control module controls the linear module to start, and drives the driving limiter 52 to move from the driving part 521 to the supporting part through the slider, so that the driving limiter 52 switches from the driving position to the limiting position.

[0097] When the leakage phenomenon is checked and the leakage circuit breaker needs to be started again, the control module can control the linear module to start, and drive the drive limit member 52 to move along the direction from the support part to the drive part 521 through the slider, so that the drive limit member 52 switches from the restricting position to the driving position.

[0098] At this time, the first driving structure can be controlled to drive the moving contact 3 to switch from the disengaged position to the contact position, thereby connecting the current of the circuit where the leakage circuit breaker is located.

[0099] When the driving assembly 51 is a driving cylinder, the cylinder body of the driving cylinder can be installed on the second housing 13, and the driving limiter 52 can be indirectly or directly installed on the telescopic end of the driving cylinder. When leakage current occurs in the circuit where the leakage circuit breaker is located, the control module controls the driving cylinder to start, specifically, controls the telescopic end of the driving cylinder to retract, so that the driving limiter 52 switches from the driving position to the limiting position.

[0100] When the leakage phenomenon is checked and the leakage circuit breaker needs to be started again, the control module can control the drive cylinder to start, specifically, control the telescopic end of the drive cylinder to extend so that the drive limit member 52 switches from the restricting position to the driving position.

[0101] At this time, the first driving structure can be controlled to drive the moving contact 3 to switch from the disengaged position to the contact position, thereby connecting the current of the circuit where the leakage circuit breaker is located.

[0102] In the embodiments provided in this application, Figures 6 to 10 As shown, the second driving structure 5 further includes a blocking and limiting member 53 and a first elastic member. The blocking and limiting member 53 is slidably disposed on the housing 1 , and the blocking and limiting member 53 has a limiting hole 531 .

[0103] Specifically, the blocking and limiting member 53 can be slidably disposed on the second housing 13. A mounting groove can be provided on the second housing 13, the mounting groove being communicated with the cavity of the second housing 13, and the first elastic member and the blocking and limiting member 53 are both disposed in the mounting groove.

[0104] The first elastic member may be a spring or a spring, etc., which is of course only an example and not a specific limitation. The first elastic member is in a compressed state.

[0105] It should be pointed out that, combined with Figures 6 to 8 As shown, when the driving limit member 52 switches between the driving position and the limiting position, the moving direction is perpendicular to the extending direction of the axis of the linkage shaft 41. When the blocking limit member 53 slides relative to the housing 1, the sliding direction of the blocking limit member 53 is perpendicular to the moving direction of the driving limit member 52 and the extending direction of the axis of the linkage shaft 41. In other words, the sliding direction of the blocking limit member 53, the moving direction of the driving limit member 52, and the extending direction of the axis of the linkage shaft 41 are perpendicular to each other.

[0106] Two ends of the first elastic member elastically act on the housing 1 and the blocking and limiting member 53 respectively, so as to apply a force to the blocking and limiting member 53 away from the linkage shaft 41 .

[0107] The driving limiter 52 further includes a protrusion 523 matched with the limit hole 531. When the driving limiter 52 is in the driving position, the protrusion 523 extends into the limit hole 531, and the driving part 521 contacts the linkage shaft 41. When the driving limiter 52 is in the limiting position, the protrusion 523 escapes from the limit hole 531 and is stopped and limited on the wall surface of the blocking limiter 53, and the limiter 522 contacts the linkage shaft 41 in the second position.

[0108] Thus, when the driving limit member 52 is in the driving position, the protrusion 523 extends into the limit hole 531, so that the driving portion 521 contacts the linkage shaft 41. Figure 7 When the driving limit member 52 is in the limiting position, the protrusion 523 escapes from the limiting hole 531. At this time, the blocking limit member 53 slides away from the linkage shaft 41 under the action of the first elastic member, so as to Figure 6 and Figure 7 Taking the position shown in the figure as an example, the blocking and limiting member 53 moves upward under the action of the first elastic member, so that the protrusion 523 and the limiting hole 531 are staggered, the protrusion 523 is blocked and limited on the wall surface of the blocking and limiting member 53, and the limiting portion 522 contacts the linkage shaft 41 in the second position, as shown in FIG. Figure 6 shown.

[0109] Furthermore, if Figures 6 to 8 As shown, the housing 1 has a receiving cavity, the driving assembly 51 includes a leakage tripping coil 511, a moving iron core 512 and a second elastic member 513, the leakage tripping coil 511 is arranged in the receiving cavity, and the driving limiter 52 is arranged at one end of the moving iron core 512. Specifically, the driving limiter 52 is located outside the receiving cavity, and one end of the moving iron core 512 extends out of the receiving cavity. The support part is fixedly mounted on the end of the moving iron core 512 extending out of the receiving cavity.

[0110] The moving iron core 512 is axially sleeved in the leakage tripping coil 511. When there is leakage current in the circuit where the leakage circuit breaker is located, the moving iron core 512 drives the driving limiter 52 to switch from the driving position to the limiting position. The second elastic member 513 is arranged in the accommodating cavity, and the two ends of the second elastic member 513 elastically act on the housing 1 and the moving iron core 512 respectively, so as to apply a force to the moving iron core 512 close to the linkage shaft 41.

[0111] At this time, if Figure 7 As shown, when the leakage circuit breaker provided in the embodiment of the present application is in the closed state, the linkage shaft 41 is located in the first position. Under the action of the second elastic member 513, the moving iron core 512 has a force to approach the linkage shaft 41, the driving limit member 52 is in the driving position, the protrusion 523 extends into the limit hole 531, and the driving part 521 contacts the linkage shaft 41.

[0112] When leakage occurs in the circuit where the leakage circuit breaker is located, the detection module can detect the leakage current of the circuit where the leakage circuit breaker is located, generate a leakage current signal, and transmit the leakage current signal to the control module. After receiving the leakage current signal, the control module compares it with the pre-stored leakage current threshold.

[0113] When the leakage current detected by the detection module is greater than the leakage current threshold, the leakage tripping coil 511 is energized to generate a magnetic field force, driving the moving iron core 512 to move toward the direction close to the second elastic member 513, so that the second elastic member 513 is further compressed. At the same time, the moving iron core 512 drives the driving limit member 52 to move toward the direction close to the second elastic member 513, so that the driving limit member 52 switches from the driving position to the limiting position.

[0114] When the limiting member 52 is driven to switch from the driving position to the limiting position, the protrusion 523 escapes from the limiting hole 531, and the limiting member 53 is prevented from moving away from the linkage shaft 41 under the action of the first elastic member. At the same time, the linkage shaft 41 moves upward along the inclined surface of the driving portion 521, driving the linkage shaft 41 to switch from the first position to the second position.

[0115] At this time, the moving contact 3 switches from the contact position to the disengaged position, the current in the circuit where the leakage circuit breaker is located is disconnected, and the leakage circuit breaker is in the disconnected state. At the same time, the leakage trip coil 511 is de-energized, the electromagnetic force disappears, and the moving iron core 512 has a force to approach the linkage shaft 41 under the action of the second elastic member 513. Furthermore, the protrusion 523 of the driving limit member 52 has a force to approach the linkage shaft 41, and the protrusion 523 is blocked and limited on the wall surface of the blocking limit member 53. The driving limit member 52 is in the restricted position, and the limit member 522 blocks the linkage shaft 41 from switching from the second position to the first position. Figure 6 shown.

[0116] After the inspection is completed, when the residual current circuit breaker needs to be started again, the blocking limiter 53 can be pressed to further compress the first elastic member. When the limit hole 531 is aligned with the protrusion 523, the protrusion 523 extends into the limit hole 531, the driving limiter 52 is in the driving position, and the limiter 522 releases the limit on the linkage shaft 41, allowing the linkage shaft 41 to switch between the first position and the second position.

[0117] In this case, the first driving structure 4 can be controlled to drive the moving contact 3 to switch from the disengaged position to the contact position, so that the circuit where the leakage circuit breaker is located is connected and the leakage circuit breaker is in a closed state.

[0118] The second elastic member 513 may be a spring or a spring, etc., which is of course only an example and not a specific limitation. The second elastic member 513 is in a compressed state.

[0119] In some embodiments, when the driving limit member 52 is in the limiting position, one end of the blocking limit member 53 protrudes from the housing 1 .

[0120] In this way, the blocking limiter 53 partially extends out of the housing 1, so as to inform the operator that the leakage circuit breaker has tripped and disconnected the circuit due to a leakage fault, and the cause of the leakage fault needs to be checked.

[0121] As a possible implementation, combining Figures 3 to 5 As shown, the first driving structure 4 includes a handle 42, a connecting rod 43, a support frame 44, a locking assembly 45 and a contact support 46. The handle 42 is rotatably arranged on the housing 1. The handle 42 has an open position and a closed position relative to the housing 1. When the handle 42 is in the open position, the moving contact 3 is in the disengaged position. Figure 3 When the handle 42 is in the closed position, the moving contact 3 is in the contact position, as shown in FIG. Figure 4 shown.

[0122] One end of the connecting rod 43 is rotatably connected to the handle 42, and the other end of the connecting rod 43 is rotatably arranged in the lock assembly 45. In fact, the connecting rod 43 can be a U-shaped structure. The handle 42 is provided with a socket that matches one end of the connecting rod 43, and one end of the connecting rod 43 is rotatably inserted in the socket. Similarly, the lock assembly 45 is provided with a socket that matches the other end of the connecting rod 43, and the other end of the connecting rod 43 is rotatably inserted in the socket. When the handle 42 is rotated, the lock assembly 45 can be driven to rotate through the action of the connecting rod 43.

[0123] The support frame 44 is rotatably disposed on the housing 1. The lock assembly 45 is rotatably disposed on the support frame 44. The linkage shaft 41 is movably disposed on the lock assembly 45, that is, the linkage shaft 41 moves synchronously with the movement of the lock assembly 45. The contact support 46 is movably disposed on the support frame 44, and the moving contact 3 is movably disposed on the contact support 46.

[0124] When the above technical solution is adopted, when the handle 42 is rotated, one end of the connecting rod 43 rotatably connected to the handle 42 rotates along with the handle 42, and further, the position of the other end of the connecting rod 43 rotatably connected to the lock assembly 45 changes relative to the housing 1, and the lock assembly 45 rotates relative to the housing 1. The linkage shaft 41 rotates synchronously relative to the housing 1. When the handle 42 continues to be rotated, the support frame 44 is driven to rotate relative to the housing 1, and further, the moving contact 3 is driven to move in a direction close to or away from the static contact 2, so that the moving contact 3 switches between the contact position and the disengaged position.

[0125] Furthermore, if Figure 5As shown, the first driving structure 4 further includes a third elastic member 47 disposed on the housing 1. Two ends of the third elastic member 47 elastically act on the support frame 44 and the contact support 46 respectively, so as to apply a torsional force to the moving contact 3 to approach the stationary contact 2.

[0126] In this way, the movable contact 3 and the stationary contact 2 are in elastic contact, which can improve the contact stability between the movable contact 3 and the stationary contact 2 .

[0127] like Figure 3 and Figure 4 As shown, the lock assembly 45 includes a jumper 452 and a lock 451, and the jumper 452 is rotatably arranged on the support frame 44. The other end of the connecting rod 43 is rotatably arranged on the jumper 452. The lock 451 is rotatably arranged on the support frame 44, and the lock 451 has a locking part, one end of which is located on the rotation track of the jumper 452, and the linkage shaft 41 is rotatably arranged on the lock 451.

[0128] Also, if Figures 3 to 5 As shown, the first driving structure 4 further includes a rotating shaft 48 and a fourth elastic member 49, the rotating shaft 48 is disposed on the housing 1, and the third elastic member 47 is sleeved outside the rotating shaft 48. The axis of the rotating shaft 48 is colinear with the rotating axis of the support frame 44, and the support frame 44 rotates relative to the housing 1 with the rotating shaft 48 as the axis. The two ends of the fourth elastic member 49 elastically act on the rotating shaft 48 and the lock buckle 451 respectively, so as to apply a force to the locking portion to approach the jump buckle 452.

[0129] In this way, the stability of the locking of the lock buckle 451 and the jump buckle 452 can be ensured, and the firmness of the contact between the moving contact 3 and the stationary contact 2 can be improved.

[0130] In specific implementation, when the handle 42 is in the disconnected position, the leakage circuit breaker is in the disconnected state. Figure 3 The disconnected state shown switches to Figure 4 In the closed state shown, the handle 42 can be rotated clockwise, and the trip button 452 can be driven to rotate through the connecting rod 43. When the trip button 452 is locked with the locking part, the support frame 44 can be driven to rotate clockwise relative to the housing 1, and at this time, the linkage shaft 41 rotates clockwise. Specifically, the support frame 44 rotates around the rotation axis 48 with the rotation axis 48 as the center. When the support frame 44 rotates, under the action of the third elastic member 47, the driving contact 3 supports clockwise rotation, and synchronously drives the moving contact 3 to rotate clockwise until the handle 42 is in the closed position, the moving contact 3 is in the contact position, and the linkage shaft 41 is in the first position. At this time, the leakage circuit breaker is in the closed state.

[0131] When leakage current occurs in the circuit where the leakage circuit breaker is located, the second driving structure 5 drives the linkage shaft 41 to switch from the first position to the second position, driving the lock buckle 451 to rotate counterclockwise, so that the lock buckle 451 is disengaged from the jump buckle 452, the moving contact 3 is in the disengaged position, and the leakage circuit breaker is in the disconnected state.

Claims

1. A leakage circuit breaker, characterized in that: include: case; A static contact, arranged on the housing; A moving contact, rotatably disposed on the housing; The movable contact has a contact position and a disengagement position relative to the housing. When the movable contact is in the contact position, the movable contact is in contact with the stationary contact; when the movable contact is in the disengagement position, the movable contact is disengaged from the stationary contact. a first driving structure, wherein the movable contact is arranged at a driving end of the first driving structure, and the first driving structure is used to drive the movable contact to rotate and switch between the contact position and the disengagement position; The first driving structure has a linkage shaft, and the linkage shaft moves synchronously with the moving contact; the linkage shaft has a first position and a second position relative to the housing; when the linkage shaft is in the first position, the moving contact is in the contact position; when the linkage shaft is in the second position, the moving contact is in the disengagement position; A second driving structure is disposed on the housing; The second driving structure comprises a driving limiter, wherein the driving limiter has a driving position and a limiting position relative to the housing; When the drive limit member is in the drive position, the linkage shaft is allowed to switch between the first position and the second position, and when there is leakage current in the circuit where the leakage circuit breaker is located, the drive limit member drives the linkage shaft to rotate from the first position to the second position; when the drive limit member is in the limiting position, the linkage shaft is in the second position, and the drive limit member limits the linkage shaft from switching from the second position to the first position.

2. The residual current circuit breaker according to claim 1, characterized in that: The leakage circuit breaker also includes: A detection module, the detection module is used to detect the leakage current of the circuit where the leakage circuit breaker is located and generate a leakage current signal; A control module is electrically connected to the detection module and the second driving structure; the control module is used to receive the leakage current signal and control the action of the second driving structure according to the leakage current signal.

3. The residual current circuit breaker according to claim 1, characterized in that: The drive limit member includes a driving part and a limiting part. When the linkage shaft is in the first position, the linkage shaft contacts the driving part. When there is leakage current in the circuit where the leakage circuit breaker is located, the driving component included in the second driving structure drives the drive limit member to switch from the driving position to the limiting position. The driving part is used to drive the linkage shaft to switch from the first position to the second position. When the drive limit member is in the limiting position, the limiting part contacts the linkage shaft in the second position. The limiting part is used to limit the linkage shaft from switching from the second position to the first position.

4. The residual current circuit breaker according to claim 3, characterized in that: The second driving structure further includes a blocking and limiting member and a first elastic member, wherein the blocking and limiting member is slidably disposed on the housing, and the blocking and limiting member has a limiting hole; two ends of the first elastic member elastically act on the housing and the blocking and limiting member respectively, so as to apply a force to the blocking and limiting member away from the linkage shaft; The driving limiter also includes a protrusion matched with the limit hole, and when the driving limiter is in the driving position, the protrusion extends into the limit hole; when the driving limiter is in the limiting position, the protrusion escapes from the limit hole and is stopped and limited on the wall surface of the blocking limiter; The housing has a receiving cavity, and the driving assembly includes: A leakage tripping coil is arranged in the accommodating cavity; The moving iron core is axially sleeved in the leakage tripping coil; the driving limiter is arranged at one end of the moving iron core; when there is leakage current in the circuit where the leakage circuit breaker is located, the moving iron core drives the driving limiter to switch from the driving position to the limiting position; The second elastic member is arranged in the accommodating cavity; the two ends of the second elastic member elastically act on the housing and the moving iron core respectively, so as to apply a force to the moving iron core close to the linkage shaft.

5. The residual current circuit breaker according to claim 4, characterized in that: When the driving limiting member is at the limiting position, one end of the blocking limiting member protrudes from the housing.

6. The residual current circuit breaker according to claim 2, characterized in that: The detection module includes a zero-sequence current transformer, which is used to detect the leakage current of the circuit where the leakage circuit breaker is located and generate a leakage current signal.

7. The residual current circuit breaker according to claim 1, characterized in that: The first driving structure comprises: A handle is rotatably arranged on the housing; the handle has an open position and a closed position relative to the housing, when the handle is in the open position, the moving contact is in the disengaged position; when the handle is in the closed position, the moving contact is in the contact position; A connecting rod, one end of which is rotatably connected to the handle; A support frame, rotatably disposed on the housing; A lock assembly is rotatably disposed on the support frame; the other end of the connecting rod is rotatably disposed on the lock assembly; and the linkage shaft is rotatably disposed on the lock assembly; The contact support is movably arranged on the support frame; the moving contact is movably arranged on the contact support.

8. The residual current circuit breaker according to claim 7, characterized in that: The first driving structure further includes a third elastic member, which is disposed on the housing; two ends of the third elastic member elastically act on the support frame and the contact support respectively, so as to apply a torsional force to the moving contact to approach the static contact.

9. The residual current circuit breaker according to claim 7, characterized in that: The lock assembly comprises: A jump buckle is rotatably arranged on the support frame; the other end of the connecting rod is rotatably arranged on the jump buckle; The lock buckle is rotatably arranged on the support frame; the lock buckle has a locking portion, one end of which is located on the rotation track of the jump buckle; and the linkage shaft is rotatably arranged on the lock buckle.

10. The residual current circuit breaker according to claim 9, characterized in that: The first driving structure further includes: A rotating shaft is disposed on the housing; the axis of the rotating shaft is colinear with the rotating axis of the support frame; A fourth elastic member, two ends of which elastically act on the rotating shaft and the lock buckle respectively, so as to apply a force to the locking portion to approach the jump buckle.

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