Residual current operated circuit breaker

Abstract

The present invention provides a residual current operated circuit breaker, which includes a housing, a handle, a driving wheel, a trip frame, a moving contact, a static contact and a leakage trip mechanism. The leakage trip mechanism includes a residual current detector, a residual current trip device and a leakage bracket. The leakage bracket is pivotally connected to the housing, and the leakage bracket has a first position and a second position. In a state where there is no residual current, the leakage bracket is in the first position, the driving wheel and the trip frame are locked, and the trip frame is partially located on the motion trajectory of the trip drive unit. When there is residual current in the circuit, the leakage bracket rotates from the first position to the second position and triggers the trip frame located on its motion trajectory to rotate so that the trip frame is unlocked from the driving wheel, the moving contact and the static contact are separated, and the handle is opened. The leakage bracket rotates to the second position, and the reset drive unit is located on the trajectory of the handle opening rotation or closing rotation. When the handle is opened or closed, the leakage bracket follows the handle and is linked to reset to the first position.

Description

Technical Field

[0001] The present invention relates to a circuit breaker, and in particular to a residual current operated circuit breaker. Background Art

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions, and carrying and interrupting current under abnormal circuit conditions within a specified timeframe. A residual current operated circuit breaker is a type of circuit breaker that connects, carries, and interrupts current under normal circuit conditions. It disconnects the circuit when the residual current reaches a specified value under specified conditions, and also connects, carries, and interrupts current under specified abnormal circuit conditions (such as a short circuit).

[0003] The operating mechanism of existing residual current operated circuit breakers includes components such as a handle, a double U-shaped connecting rod, a tripping catch, a locking catch, a lever, a locking catch spring, a contact spring, a reset spring, a movable contact, a stationary contact, a spring plate, a tripping rod, a reset rod, and an electromagnetic transformer. The reset rod is connected to the tripping catch, the spring plate is connected to the reset rod, and the tripping rod is pivotally connected to the housing and must follow the reset rod and spring plate in conjunction when a residual current trips. The arrangement of the spring plate, tripping rod, reset rod, and electromagnetic transformer is not only complex and costly, but also requires high installation precision. Furthermore, the connection between the reset rod and the tripping catch increases the difficulty of installation.

[0004] Furthermore, existing residual current operated circuit breakers typically only have an on / off indicator to indicate the contact state, without any indication of leakage current, making them inconvenient for users. Furthermore, the electromagnetic transformer in existing residual current operated circuit breakers is fixed inside the housing, making it difficult to replace and demagnetize. Summary of the Invention

[0005] In order to overcome the problems of complex structure and high cost of residual current operated circuit breakers in the prior art, the present invention provides a residual current operated circuit breaker with simple structure, easy assembly and low cost.

[0006] To achieve the above objectives, the present invention provides a residual current operated circuit breaker, comprising a housing, a handle, a drive wheel, a trip frame, a movable contact, a stationary contact, and a leakage trip mechanism. The leakage trip mechanism comprises a residual current detector, a residual current trip device, and a leakage bracket. The residual current detector detects residual current in the circuit. The residual current trip device is electrically connected to the residual current detector and operates based on the detected residual current. The bracket comprises a bracket body, a reset drive unit, a leakage drive unit, and a trip drive unit. The bracket body is pivotally connected to the housing, and the leakage bracket has a first position and a second position.

[0007] In the state of no residual current, the leakage bracket is in the first position, the driving wheel and the trip frame are locked, the moving contact abuts the static contact and the trip frame is partially located on the motion trajectory of the trip drive part;

[0008] When there is residual current in the circuit, the residual current release triggers the leakage drive unit to rotate the leakage bracket from the first position to the second position and triggers the trip frame located on its motion trajectory to rotate so that the trip frame is unlocked from the driving wheel, the moving contact and the static contact are separated, and the handle is opened;

[0009] The leakage bracket rotates to the second position, and the reset drive unit is located on the trajectory of the handle opening or closing rotation. When the handle opens or closes, the leakage bracket follows the handle and resets to the first position.

[0010] According to one embodiment of the present invention, the leakage bracket also includes a leakage indicator portion formed on the bracket body and extending toward the top of the shell, the leakage indicator portion has a first mark indicating a state of no residual current and a second mark indicating a state of residual current tripping, and the top of the shell has a leakage indication observation window, and the leakage indicator portion rotates with the bracket body so that the leakage indication observation window displays the first mark or the second mark.

[0011] According to one embodiment of the present invention, the leakage drive unit is installed on the shell through the leakage reaction spring. In the closed state with no residual current, the leakage reaction spring is in a natural state to make the leakage bracket in the first steady position; when there is residual current in the circuit, the residual current release triggers the leakage drive unit to make the leakage bracket rotate to the second position and compress the leakage reaction spring.

[0012] According to one embodiment of the present invention, when the leakage current bracket rotates to the second position and the reset drive unit is located on the trajectory of the handle closing rotation, the leakage current tripping mechanism also includes a stop mechanism that locks the leakage current bracket in the second position, and the stop mechanism includes a cam, a stop member, and a stop member compression spring. The cam is pivotally connected to the handle via a cam torsion spring. The stop member includes a triggering portion that engages with the cam and a locking portion that engages or disengages with the leakage current drive unit, and the connection between the triggering portion and the locking portion is pivotally connected to the housing. The stop member compression spring is arranged on one side of the locking portion;

[0013] When the leakage bracket rotates to the first position following the closing of the handle, the locking portion separates from the leakage driving portion and compresses the stopper compression spring;

[0014] When residual current appears in the circuit, the handle is opened, the leakage bracket rotates to the second position and compresses the leakage reaction spring, the restoring force of the stopper compression spring drives the locking part to engage with the leakage drive part, the trigger part engages the cam, and the leakage reaction spring and the cam torsion spring respectively apply opposite forces on the stopper to enable the locking part to lock the leakage drive part.

[0015] When the leakage bracket rotates following the closing of the handle, the locking part and the leakage driving part are unlocked, the restoring force of the stopper compression spring pushes the locking part to drive the stopper to rotate, the trigger part and the cam are disengaged, and the restoring force of the leakage reaction spring is superimposed on the handle thrust to drive the leakage bracket to rotate to the first position.

[0016] According to one embodiment of the present invention, the surface where the leakage driving part contacts the locking part is an arc-shaped curved surface and has a locking step on the curved surface; in the locked state, the end of the locking part abuts against the locking step; when unlocked, the end of the locking part slides out from the locking step.

[0017] According to an embodiment of the present invention, the leakage tripping mechanism further includes a bracket mounting plate, the bracket mounting plate is fixed to the housing, and the leakage bracket is arranged on the bracket mounting plate.

[0018] According to one embodiment of the present invention, the bracket body extends toward the side where the moving contact is located and the extended end is connected to the shell through the bracket pivot, extending the rotation stroke of the leakage drive part to trigger the trip frame; the bracket body also has a movable hole, and the fastener penetrates the movable hole to fix the bracket body to the shell, and the bracket body rotates around the bracket pivot along the trajectory of the movable hole.

[0019] According to one embodiment of the present invention, the reset drive portion is a reset rod, one end of the reset rod is fixedly connected to the bracket body, and the free end extends to the side where the handle rotates to close the circuit breaker. The handle has a handle drive portion that cooperates with the reset rod. When the leakage bracket is in the second position, the end of the free end of the reset rod is located on the trajectory of the closing rotation of the handle drive portion. When the handle is closed, the handle drive portion abuts against the reset rod so that the reset rod rotates in the same direction as the handle to the first position and drives the residual current release to reset.

[0020] According to one embodiment of the present invention, the reset drive portion is connected to the bracket body and extends toward the handle opening side. The handle opening side has a handle drive portion that cooperates with the reset drive portion. When there is residual current in the circuit to cause the handle to open, the handle drive portion drives the reset drive portion to rotate in the opposite direction of the handle to the first position and drives the residual current release to reset.

[0021] According to an embodiment of the present invention, the residual current operated circuit breaker further includes a short-circuit tripping mechanism and an overload tripping mechanism arranged opposite to the trip frame.

[0022] In summary, the residual current operated circuit breaker provided by the present invention has a leakage tripping mechanism that only includes a residual current detection component, a residual current release, and a leakage bracket pivotally connected to the housing. In the closed state with no residual current, the leakage bracket is stable in the first position. When there is residual current in the circuit, the residual current detection component drives the leakage bracket to rotate from the first position to the second position. During the rotation, the tripping drive unit triggers the tripping frame located on its trajectory, the tripping frame and the driving wheel are unlocked, the moving contact and the static contact are separated, and the handle is opened. When the handle is opened or closed again, the leakage bracket is driven to reset to the first position indicating no residual current. The residual current operated circuit breaker provided by the present invention realizes the leakage tripping drive and its own reset through a leakage bracket pivotally connected to the housing, greatly simplifying the structure of the leakage tripping. In addition, the leakage bracket is simply pivotally connected to the housing. During installation, it is only necessary to ensure that a part of the tripping frame is located on the motion trajectory of the reset of the tripping drive unit when the circuit is tripped. The installation is simple and the installation accuracy requirements are low, making the installation very convenient.

[0023] In addition, the leakage bracket also includes a leakage indicator formed on the bracket body. The leakage indicator synchronously indicates the leakage tripping situation under different states as the position of the leakage bracket changes; that is, the leakage bracket integrates leakage tripping, leakage indication and reset in one component, which greatly simplifies the structure of the residual current operated circuit breaker.

[0024] In order to make the above and other objects, features and advantages of the present invention more clearly understood, preferred embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG2 is a structural diagram of one side of a residual current operated circuit breaker provided in the first embodiment of the present invention in a connected state.

[0026] Figure 2 Shown Figure 1 Schematic diagram of the structure in the disconnected state.

[0027] Figure 3 Shown Figure 2 A structural diagram from another perspective.

[0028] Figure 4 Shown Figure 3 The structural diagram of the other side of the residual current operated circuit breaker is shown.

[0029] Figure 5 Shown Figure 1 Exploded diagram of the leakage bracket and the stop mechanism.

[0030] Figure 6 Shown Figure 1Schematic diagram of the exploded view of the middle handle, drive wheel, trip frame and leakage support.

[0031] Figure 7 FIG2 is a structural diagram of one side of a residual current operated circuit breaker provided in the second embodiment of the present invention in a connected state.

[0032] Figure 8 Shown Figure 7 Schematic diagram of the structure in the disconnected state.

[0033] Figure 9 Shown Figure 8 Schematic diagram of the structure from another perspective. DETAILED DESCRIPTION

[0034] Existing residual current operated circuit breakers rely on the linkage of a spring plate, a trip rod, and a reset rod to achieve leakage tripping. This structure is very complex and requires high precision for each component and its installation. This is not only expensive but also inconvenient to install. In view of this, this embodiment provides a residual current operated circuit breaker with a simple structure, low cost, and very convenient installation.

[0035] like Figures 1 to 3 As shown, the residual current operated circuit breaker provided in this embodiment includes a housing 10, a handle 20, a driving wheel 30, a trip frame 40, a moving contact 50, a static contact 60 and a leakage trip mechanism 70. The leakage trip mechanism 70 includes a residual current detection component 1, a residual current trip device 2 and a leakage bracket 3. The residual current detection component 1 detects the residual current in the circuit. The residual current trip device 2 is electrically connected to the residual current detection component 1 and operates based on the detected residual current. The leakage bracket 3 includes a bracket body 31, a reset drive unit 32, a leakage drive unit 33 and a trip drive unit 34, Figure 1 、 Figure 3 as well as Figure 5 The various parts of the leakage current support are divided by dotted lines. The support body 31 is pivotally connected to the housing 10, and the leakage current support 3 has a first position and a second position.

[0036] like Figure 1 As shown, in the on state without residual current, the leakage support 3 is in the first position, the driving wheel 30 and the trip frame 40 are locked, the moving contact 50 abuts against the static contact 60 and the trip frame 40 is partially located on the motion trajectory of the trip drive part 34.

[0037] When residual current flows through the circuit, the residual current release 2 triggers the leakage driver 33 to rotate the leakage support 3 from the first position to the second position. This triggers the trip frame 40, located along its trajectory, to rotate, unlocking the trip frame 40 from the drive wheel 30. This separates the moving contact 50 from the stationary contact 60, opens the handle 20, and rotates the leakage support 3 to the second position. At this point, the reset driver 32 is located along the trajectory of the handle 20's closing rotation. When the handle 20 is closed again, the leakage support 3 follows the handle 20 and resets to the first position.

[0038] The leakage bracket 3 in the residual current actuator provided in this embodiment integrates the leakage driver 33, the reset driver 32, and the trip driver 34 into one unit. This single component simultaneously triggers and resets the leakage tripping, greatly simplifying the overall structure and installation process of the residual current operated circuit breaker and significantly reducing costs. Furthermore, the leakage bracket 3 is not connected to the trip frame 40 or the drive wheel 30, but only needs to meet the following requirements: in the closed state, the trip frame 40 is partially located on the trajectory of the tripping rotation of the trip driver 34. This arrangement effectively avoids interference between the leakage bracket 3 and other components while achieving stable leakage tripping, thereby ensuring that the residual current operated circuit breaker can trip stably and accurately under each tripping condition (including leakage state, overload state, and short circuit state).

[0039] In this embodiment, the residual current detector 1 is an electromagnetic transformer removably mounted within the housing 10 from the bottom thereof and used to detect residual current in the circuit. The residual current release 2 is an electromagnetic relay disposed above the leakage driver 33 and driving the leakage driver 33 to rotate when a residual current is present. Specifically, when a residual current is present, the electromagnetic relay's push rod 21 pushes against the leakage driver 33.

[0040] like Figure 1 and Figure 5 As shown, the bracket body 31 extends toward the side where the moving contact 50 is located, and the extended end is connected to the housing 10 via the bracket pivot 36. This arrangement effectively extends the radius of rotation of the tripping drive unit 34 about the bracket pivot 36 during tripping, thereby extending its tripping rotation stroke and ensuring that it strikes the trip frame 40 during rotation. The extended tripping stroke of the tripping drive unit 34 increases the distance between the tripping drive unit 34 and the trip frame 40 when the leakage current bracket 3 is in the first position, thereby further preventing interference between the leakage current bracket 3 and the trip frame 40. It also reduces the installation precision requirements for the leakage current bracket 3, improving product stability while further reducing processing requirements.

[0041] like Figure 1As shown, the leakage driving unit 33 is mounted on the housing 10 via the leakage reaction spring 4. To ensure the stability of the leakage bracket 3, the bracket body 31 is also provided with a movable hole 311. The fastener 37 penetrates the movable hole 311 to fix the bracket body 31 to the housing 10. The bracket body 31 rotates stably around the bracket pivot 36 between the first position and the second position along the trajectory of the movable hole 311. Specifically, when the fastener 37 is located at the lower end of the movable hole 311, as shown in FIG. Figure 1 As shown, the leakage bracket 3 is in the first position; when the fastener 37 is located at the upper end of the movable hole 311, as shown Figure 3 As shown, the leakage support 3 is in the second position.

[0042] like Figure 1 As shown, the leakage current support 3 is mounted overlying the operating mechanism (which includes components such as the trip frame 40 and the drive wheel 30), with the operating mechanism separated from the leakage current support 3 and the housing 10. To facilitate installation of the leakage current support 3, in this embodiment, the leakage current trip mechanism 70 also includes a support mounting plate 6 fixed to the housing 10 and inserted horizontally between the leakage current support 3 and the operating mechanism. The leakage current support 3 is attached to the support mounting plate 6 via a support pivot 36 and fasteners 37.

[0043] like Figure 1 and Figure 5 As shown, the reset drive unit 32 is a reset rod, one end of which is fixedly connected to the bracket body 31, and the free end extends to the side where the handle 20 rotates to close the switch. The handle 20 has a handle drive unit 201 that cooperates with the reset rod (reset drive unit 32). Figure 2 As shown, when the leakage support 3 is in the second position, the free end of the reset rod is located on the track of the handle driving part 201 when the switch is closed. When the handle 20 is closed, the handle driving part 201 abuts against the reset rod so that the reset rod follows the handle 20 in the same direction ( Figure 2 The reset driver rotates (clockwise) to the first position and resets the ejector pin 21 in the residual current release 2. However, the present invention does not impose any limitations on the specific structure of the reset driver. In other embodiments, the reset driver may have a different shape; it only needs to follow the handle driver's rotation in the closing direction to reset to the first position when the handle is closed.

[0044] The configuration of the leakage bracket 3 described above enables tripping when residual current exists in the circuit. Furthermore, in this embodiment, the leakage bracket 3 also includes a leakage indicator 35 formed on the bracket body 31 and extending toward the top of the housing 10. The leakage indicator 35 has a first mark 351 indicating a state without residual current and a second mark 352 indicating a state of tripping with residual current. Specifically, in this embodiment, the first mark 351 is green, and the second mark 352 is red. The top of the housing 10 has a leakage indication observation window 101. The leakage indicator 35 rotates with the bracket body 31 so that the leakage indication observation window 101 displays the first mark 351 or the second mark 352. The configuration of the leakage indicator 35 enables simultaneous and rapid indication of leakage tripping and leakage indication. Compared to existing residual current operated circuit breakers that use multiple levers to achieve leakage indication, this configuration further simplifies the structure of the residual current operated circuit breaker.

[0045] In this embodiment, the leakage driver 33 is mounted to the bracket mounting plate 6 via a leakage reaction spring 4. In the closed state with no residual current, the leakage reaction spring 4 is in a natural state, causing the leakage bracket 3 to be in the stable first position and the green first mark 351 on the leakage indicator 35 to be stably located within the leakage indication observation window 101. When residual current exists in the circuit, the push rod 21 within the residual current release 2 pushes against the leakage driver 33 and compresses the leakage reaction spring 4, causing the leakage bracket 3 to rotate counterclockwise to trip. Due to the reaction force of the leakage reaction spring 4, the leakage bracket 3 cannot be stably maintained in the second position. At this time, the second mark 352 on the leakage indicator 35 will not be stably located within the leakage indication observation window 101. In view of this, in this embodiment, the leakage trip mechanism 70 also includes a stop mechanism 5 that locks the leakage bracket 3 in the second position. However, the present invention is not limited to this. In other embodiments, the stop mechanism may not be required when leakage indication is not required.

[0046] In this embodiment, the stop mechanism 5 includes a cam 51, a stopper 52, and a stopper compression spring 53. The cam 51 is pivotally connected to the handle 20 via a cam torsion spring 511. The stopper 52 includes a trigger portion 521 that engages with the cam 51 and a locking portion 522 that engages or disengages with the leakage current driver 33. The connection between the trigger portion 521 and the locking portion 522 is pivotally connected to the bracket mounting plate 6. The stopper compression spring 53 is disposed on the bracket mounting plate 6 and is located on one side of the locking portion 522. The surface where the leakage current driver 33 contacts the locking portion 522 is an arc-shaped curved surface with a locking step 331 formed thereon.

[0047] like Figure 2 As shown, when the leakage support 3 follows the handle 20 to close and rotate ( Figure 2), relative motion occurs between the handle 20 and the cam 51, the cam torsion spring 511 is slightly compressed, and the reaction force of the cam torsion spring 511 drives the cam 51 to rotate counterclockwise by a very small angle. This small angle of rotation pushes the trigger portion 521 to cause the stopper 52 to rotate clockwise, and the cam 51 and the trigger portion 521 separate. The cam 51 follows the clockwise rotation of the handle 20, and the end of the lock portion 522 slides out of the locking step 331, and the stop mechanism 5 is unlocked from the leakage drive portion 33. The force of the cam 51 acting on the leakage drive portion 33 disappears, and the leakage bracket 3 rotates clockwise to the first position under the restoring force of the leakage reaction spring 4 and the handle 20. At the same time, the arc-shaped surface of the leakage drive portion 33 pushes the lock portion 522 and slightly presses the stopper compression spring 53.

[0048] When residual current appears in the circuit, the handle 20 opens, and the leakage driver 33 is pushed by the push rod 21, rotating counterclockwise and compressing the leakage reaction spring 4. The restoring force of the stopper compression spring 53 drives the locking portion 522 to slide along the curved surface of the leakage driver 33 into the locking step 331, and the triggering portion 521 engages with the cam 51. The leakage reaction spring 4 applies an upward pushing force to the stopper 52 through the leakage driver 33, while the cam 51 applies downward pressure to the stopper 52. The two opposing forces cause the locking portion 522 to lock the leakage driver 33, and the leakage bracket 3 is confined to the second position. The leakage indicator observation window 101 displays a second red mark to indicate that the residual current operated circuit breaker is currently in the leakage trip state.

[0049] In this embodiment, if Figure 4 As shown, the residual current operated circuit breaker also includes a short-circuit trip mechanism 80 and an overload trip mechanism 90, which are arranged opposite the trip frame 40. The short-circuit trip mechanism 80 is a magnetic trip device. When a short circuit occurs in the circuit, the magnetic trip device pushes the trip frame 40 to rotate and trip. The overload trip mechanism 90 includes a bimetallic strip 901 and a tripping rod 902. When an overload occurs in the circuit, the bimetallic strip deforms and pulls the trip frame 40 to trip. During a short-circuit trip or an overload trip, since there is no residual current in the circuit, the residual current trip device 2 does not operate, the leakage bracket 3 does not rotate, and the leakage indicator 35 does not follow the handle 20 to open the circuit, but continues to display the green first mark 351.

[0050] Figure 1 This is a structural diagram of the residual current operated circuit breaker in the connected state. Figure 2 The following is a schematic diagram of the structure in the disconnected state. Figures 1 to 6 The structure and working principle of the residual current operated circuit breaker provided in this embodiment are described in detail.

[0051] like Figure 2As shown, when the residual current operated circuit breaker is in the off state, the leakage current support 3 is in the second position, i.e., the fastener 37 is located at the upper end of the movable hole 311. The stop mechanism 5 locks the leakage current driver 33, and the leakage current indicator 35 steadily displays the second red mark 352. Pushing the handle 20 clockwise in the direction indicated by arrow K in the figure closes the circuit. The handle 20 pushes the drive wheel 30 via the double U-shaped connecting rod 100, which engages and locks the double U-shaped connecting rod 100. The handle 20, via the double U-shaped connecting rod 100, drives the drive wheel 30, the trip frame 40, and the moving contact 50 in a coordinated manner, bringing the moving contact 50 into contact with the stationary contact 60. Simultaneously, the handle drive unit 201 on the handle 20 pushes against the upper end of the reset lever (reset drive unit 32), driving the leakage current support 3 clockwise. The cam 51 follows the handle 20 and disengages the trigger unit 521, unlocking the stop mechanism 5 from the leakage current driver 33. The leakage support 3 moves clockwise to the position where the leakage current is generated under the action of the restoring force of the leakage reaction spring 4 and the reset pull rod. Figure 1 In the first position, that is, the fastener 37 is located at the lower end of the movable hole 311, and the green first mark 351 is displayed in the leakage indication observation window 101. The leakage reaction spring 4 returns to its natural state. At the same time, the push rod 21 in the residual current release 2 is pushed upward and retracted by the leakage drive unit 33 rotating clockwise.

[0052] exist Figure 1 In the connected state shown, when the residual current detection component 1 detects the presence of residual current in the circuit, the push rod 21 in the residual current release 2 pushes the leakage drive part 33 downward to rotate the leakage bracket 3 in the counterclockwise direction and compress the leakage reaction spring 4. During the rotation of the leakage bracket 3, the tripping drive part 34 hits the tripping frame fulcrum 401 on the tripping frame 40 located on its motion trajectory to rotate the tripping frame 40 in the counterclockwise direction. The tripping frame 40 and the driving wheel 30 are unlocked, and the driving wheel 30 drives the moving contact 50 to move counterclockwise under the action of the reset tension spring 301 and separates from the static contact 60; and the handle 20 opens the circuit in the counterclockwise direction under the action of the handle torsion spring 202. The locking portion 522 on the stop mechanism 5 slides into the locking step 331 along the arc-shaped surface of the leakage drive part 33, and the triggering portion 521 engages with the cam 51, and the stop mechanism 5 locks the leakage bracket 3 in the second position (such as Figure 2 As shown), a red second mark 352 is displayed in the leakage indication observation window 101.

[0053] In this embodiment, the residual current operated circuit breaker also includes an on / off indicator portion (not shown in the figure due to viewing angle reasons) that is linked to the handle 20 and has different color markings. The on / off indicator portion is used to display the closed or open status of the circuit breaker. The housing 10 has an on / off status observation window 102 corresponding to the on / off indicator portion. That is, the residual current operated circuit breaker provided in this embodiment has both an on / off indicator and a leakage indicator, and the two are independent of each other. Specifically, when the residual current operated circuit breaker is connected, the on / off indicator is red and the leakage indicator is green. When the residual current operated circuit breaker is manually disconnected, short-circuited, or disconnected by overload, the on / off indicator is green, while the leakage indicator remains green; when the residual current operated circuit breaker is disconnected due to residual current in the circuit, the on / off indicator is green and the leakage indicator is red.

[0054] Example 2

[0055] This embodiment is basically the same as the first embodiment and its variations, except that: the residual leakage operated circuit breaker provided in this embodiment has a different reset method for the leakage bracket and has no leakage indicator and stop mechanism.

[0056] like Figures 7 to 9 As shown, in this embodiment, when there is residual current in the circuit, after the leakage bracket 3 rotates to the second position, the reset drive unit 32 is located on the track of the handle 20 opening rotation. When the handle 20 opens, the leakage bracket 3 follows the handle 20 and resets to the first position. Specifically: the reset drive unit 32 is connected to the bracket body 31 and extends toward the opening side of the handle 20 ( Figure 7 The handle 20 has a handle drive unit 201 on the opening side thereof (the direction is along the upper left corner of the housing). The handle 20 has a handle drive unit 201 that cooperates with the reset drive unit 32. When residual current exists in the circuit to open the handle 20, the handle drive unit 201 drives the reset drive unit 32 to rotate in the opposite direction to the opening direction of the handle 20 to the first position, thereby resetting the residual current release 2.

[0057] Figure 7 FIG. 1 is a schematic structural diagram of the residual current operated circuit breaker provided in this embodiment in a connected state; Figure 8 for Figure 7 Schematic diagram of the structure in disconnected state; Figure 9 Shown Figure 8 Schematic diagram of the structure from another perspective.

[0058] When the residual current operated circuit breaker is in the on state ( Figure 7 When the residual current detection element 1 in the residual current release 2 detects the presence of residual current in the circuit, the top rod 21 of the residual current release 2 pushes the leakage driving part 33 downward so that the leakage bracket 3 moves along the Figure 7The middle part rotates counterclockwise to the second position, the leakage reaction spring 4 is compressed, and the fastener 37 is located at the upper end position of the movable hole 311. During the counterclockwise rotation of the leakage bracket 3, the tripping drive part 34 hits the tripping frame fulcrum 401 located on its motion trajectory, the tripping frame 40 and the driving wheel 30 are unlocked, and the driving wheel 30 drives the moving contact 50 to move counterclockwise under the action of the reset tension spring 301 and separates from the static contact 60; and the handle 20 is reset by rotating counterclockwise under the action of the handle torsion spring 202. At the same time, in the process of the handle opening, the handle drive part 201 rotating counterclockwise pushes the reset drive part 32 to make the reset drive part 32 rotate clockwise around the bracket pivot 36. Under the joint action of the reset drive part 32 and the leakage reaction spring 4, the leakage drive part 33 rotates clockwise and pushes the top rod 21 of the residual current release 2 upward to reset, and the leakage bracket 3 rotates back to Figure 8 The first position in .

[0059] That is, during the entire leakage tripping process, the leakage bracket 3 only moves to the second position instantaneously at the initial moment of the leakage tripping to hit the tripping frame support 401. During the tripping process, the leakage bracket 3 is reset to the second position by the handle in the open state. Figure 8 In this embodiment, since the leakage support 3 only moves briefly in the second position, the figure does not show its state in the second position. However, its state is the same as that in the first embodiment. Figure 2 Similarly, at this time, the leakage reaction spring 4 is compressed and the fastener 37 is located at the upper end of the movable hole 311 .

[0060] exist Figure 8 In the state shown, the handle 20 is pushed clockwise in the direction indicated by the arrow K to close the circuit breaker. The handle 20 drives the drive wheel 30 and the trip frame 40 to lock via the double U-shaped connecting rod 100, thereby causing the moving contact 50 to abut against the static contact 60. During the closing process, the state of the leakage support 3 does not change.

[0061] The residual current operated circuit breaker provided in this embodiment is the same as that in the first embodiment and its variations. Leakage indication and reset are achieved only by a simple component, the leakage bracket 3. At the same time, it does not directly contact the drive wheel or the trip frame. It has a simple structure, is easy to install, and has a lower cost.

[0062] In summary, the residual current operated circuit breaker provided by the present invention has a leakage tripping mechanism that only includes a residual current detector, a residual leakage tripper, and a leakage bracket pivotally connected to the housing. In the closed state with no residual current, the leakage bracket is stable in the first position. When residual current exists in the circuit, the residual current tripper drives the leakage bracket to rotate from the first position to the second position. During the rotation, the tripping drive unit triggers the tripping frame located on its trajectory, the tripping frame and the driving wheel are unlocked, the moving contact and the static contact are separated, and the handle is opened. When the handle is opened or closed again, the leakage bracket is driven to reset to the first position indicating no residual current. The residual current operated circuit breaker provided by the present invention realizes the leakage tripping drive and its own reset through a leakage bracket pivotally connected to the housing, greatly simplifying the structure of the leakage tripping. In addition, the leakage bracket is simply pivotally connected to the housing. During installation, it is only necessary to ensure that a part of the tripping frame is located on the motion trajectory of the reset of the tripping drive unit when the circuit is tripped. The installation is simple and the installation accuracy requirements are low, making the installation very convenient.

[0063] In addition, the leakage bracket also includes a leakage indicator formed on the bracket body. The leakage indicator synchronously indicates the leakage tripping situation under different states as the position of the leakage bracket changes; that is, the leakage bracket integrates leakage tripping, leakage indication and reset in one component, which greatly simplifies the structure of the residual current operated circuit breaker.

[0064] Although the present invention has been disclosed above by means of preferred embodiments, this is not intended to limit the present invention. Anyone skilled in the art may make slight changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of protection required by the claims.

Claims

1. A residual current operated circuit breaker, characterized in that: It includes a housing, a handle, a driving wheel, a trip frame, a moving contact, a static contact and a leakage trip mechanism; the leakage trip mechanism includes: Residual current detection device, detecting residual current in the circuit; a residual current release electrically connected to the residual current detection element and actuated based on the detected residual current; The leakage bracket comprises a bracket body, a reset drive unit, a leakage drive unit and a trip drive unit, wherein the bracket body is pivotally connected to the housing, and the leakage bracket has a first position and a second position; In the state of no residual current, the leakage bracket is in the first position, the driving wheel and the trip frame are locked, the moving contact abuts the static contact and the trip frame is partially located on the motion trajectory of the trip drive part; When there is residual current in the circuit, the residual current release triggers the leakage drive unit to rotate the leakage bracket from the first position to the second position and triggers the trip frame located on its motion trajectory to rotate so that the trip frame is unlocked from the driving wheel, the moving contact and the static contact are separated, and the handle is opened; The leakage bracket rotates to the second position, and the reset drive unit is located on the trajectory of the handle opening or closing rotation. When the handle opens or closes, the leakage bracket follows the handle and resets to the first position.

2. The residual current operated circuit breaker according to claim 1, characterized in that: The leakage bracket also includes a leakage indicator formed on the bracket body and extending toward the top of the shell. The leakage indicator has a first mark indicating a state of no residual current and a second mark indicating a state of residual current tripping. The top of the shell is provided with a leakage indication observation window. The leakage indicator rotates with the bracket body so that the leakage indication observation window displays the first mark or the second mark.

3. The residual current operated circuit breaker according to claim 1 or 2, characterized in that: The leakage drive unit is installed on the housing through the leakage reaction spring. In the closed state with no residual current, the leakage reaction spring is in a natural state to keep the leakage bracket in the first steady position; when there is residual current in the circuit, the residual current release triggers the leakage drive unit to rotate the leakage bracket to the second position and compress the leakage reaction spring.

4. The residual current operated circuit breaker according to claim 3, characterized in that: When the reset drive unit is located on the track of the handle closing rotation after the leakage support rotates to the second position, the leakage tripping mechanism further includes a stopping mechanism for locking the leakage support in the second position, and the stopping mechanism includes: a cam pivotally connected to the handle via a cam torsion spring; The stopper comprises a triggering portion engaged with the cam and a locking portion engaged with or separated from the leakage driving portion, wherein the connection between the triggering portion and the locking portion is pivotally connected to the housing; A stopper compression spring is provided on one side of the locking portion; When the leakage current bracket rotates following the closing of the handle, the cam torsion spring drives the cam to push the trigger part in the opposite direction to rotate the stopper, and the locking part separates from the leakage current driving part and compresses the stopper compression spring; When residual current appears in the circuit, the handle is opened, the leakage bracket rotates to the second position and compresses the leakage reaction spring, the restoring force of the stopper compression spring drives the locking part to engage with the leakage drive part, the trigger part engages with the cam, and the leakage reaction spring and the cam torsion spring respectively apply opposite forces on the stopper to enable the locking part to lock the leakage drive part.

5. The residual current operated circuit breaker according to claim 4, characterized in that: The surface where the leakage driving part contacts the locking part is an arc-shaped curved surface with a locking step on the curved surface; in the locked state, the end of the locking part abuts against the locking step; when unlocked, the end of the locking part slides out from the locking step.

6. The residual current operated circuit breaker according to claim 1, characterized in that: The leakage tripping mechanism further includes a bracket mounting plate, the bracket mounting plate is fixed to the shell, and the leakage bracket is arranged on the bracket mounting plate.

7. The residual current operated circuit breaker according to claim 1, characterized in that: The bracket body extends toward the side where the moving contact is located and the extended end is connected to the shell through a bracket pivot, extending the rotation stroke of the leakage drive unit to trigger the trip frame; the bracket body also has a movable hole, and a fastener penetrates the movable hole to fix the bracket body to the shell, and the bracket body rotates around the bracket pivot along the trajectory of the movable hole.

8. The residual current operated circuit breaker according to claim 1, characterized in that: The reset drive part is a reset rod, one end of which is fixedly connected to the bracket body, and the free end extends to the side where the handle rotates to close the circuit breaker. The handle is provided with a handle drive part that cooperates with the reset rod. When the leakage bracket is in the second position, the end of the free end of the reset rod is located on the trajectory of the closing rotation of the handle drive part. When the handle is closed, the handle drive part abuts against the reset rod so that the reset rod rotates in the same direction as the handle to the first position and drives the residual current release to reset.

9. The residual current operated circuit breaker according to claim 1, characterized in that: The reset drive part is connected to the bracket body and extends toward the handle opening side. The handle opening side is provided with a handle drive part that cooperates with the reset drive part. When there is residual current in the circuit to open the handle, the handle drive part drives the reset drive part to rotate in the opposite direction of the handle to the first position and drives the residual current release to reset.

10. The residual current operated circuit breaker according to claim 1, characterized in that: The residual current operated circuit breaker further comprises a short circuit tripping mechanism and an overload tripping mechanism which are arranged opposite to the tripping frame.

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