Alarm structure of circuit breaker and circuit breaker

Abstract

The invention relates to a circuit breaker, in particular to an alarm structure of a circuit breaker and the circuit breaker. According to the alarm structure of the circuit breaker, for example, a short circuit tripping alarm module, an overload tripping alarm module or an overload alarm non-tripping module is installed and acts on the accessory cavity, the replaceability and interchangeability of the function are improved, and the expandability of the function of the circuit breaker is effectively improved.

Description

Technical Field

[0001] The present application relates to a circuit breaker, in particular to an alarm structure of a circuit breaker and a circuit breaker. Background Art

[0002] In the field of low-voltage electrical appliances, circuit breakers face diverse requirements for use in diverse scenarios to cope with diverse and complex application environments. When a line fault occurs and the circuit breaker trips, it can output the fault type and send an alarm signal. Therefore, thermal overload alarms and magnetic overload alarm trips are available. When a short circuit or overload occurs, the fault current triggers a trip, cutting off the fault current and providing protection. An alarm signal is also output.

[0003] Chinese Patent CN 210129473 U discloses a thermal overload alarm non-tripping device for a molded case circuit breaker, comprising a bracket, a bimetallic assembly, a drawbar rotatably mounted on the bracket, an alarm switch fixedly mounted on the bracket, and a return spring acting on the drawbar. A trigger block for triggering the alarm switch is disposed on the drawbar at a position corresponding to the alarm switch. When the circuit breaker is not overloaded, the return spring pulls the drawbar, causing the trigger block to actuate the alarm switch, placing the alarm switch in a first state. When the circuit breaker is overloaded, the bimetallic assembly rotates the drawbar. After the drawbar rotates a certain angle, the trigger block releases the alarm switch, placing it in a second state, thereby outputting an overload alarm signal. This tripping overload alarm operates at the rear end of the circuit breaker, and the alarm signal passes through the accessory cavity via complex wiring. This makes the installation process complex, inconvenient, and increases the number of assembly steps required for the product.

[0004] Chinese Patent CN 219658640 U discloses an overload alarm non-tripping device comprising a base, a thermal element, a bimetallic strip that bends when heated, an actuating rod, a microswitch, and a bracket for mounting the microswitch. The thermal element is mounted on the base and contacts one end of the bimetallic strip. The actuating rod is connected to the other end of the bimetallic strip. The microswitch is mounted on the base via a bracket. Its operating principle is as follows: when the current in the circuit breaker reaches a set value, the thermal element heats the bimetallic strip until it deforms sufficiently, which in turn drives the actuating rod to move and activate the microswitch. The microswitch closes, activating the alarm circuit and signaling the user. As the thermal element cools, the bimetallic strip gradually recovers its deformation, driving the actuating rod away from the microswitch and releasing the alarm. Alternatively, the actuating rod can be omitted, and the heated end of the bimetallic strip directly contacts the microswitch to activate the alarm circuit. Alternatively, a push rod can be connected to the end of the bimetallic strip, which contacts the microswitch to activate the alarm circuit. This trip overload alarm mode acts on the rear end of the circuit breaker. The alarm signal passes through the accessory cavity through complex wiring. The installation process is complicated, inconvenient to assemble, and increases the assembly process of the product. Summary of the Invention

[0005] In order to solve the above technical problems, this application provides the following technical solutions:

[0006] An alarm structure for a circuit breaker comprises a push rod, a reset compression spring sleeved on the push rod, and a micro switch triggered by the push rod.

[0007] Preferably, the push rod comprises a body and a knock-off portion.

[0008] Preferably, after the knockable portion of the push rod is knocked off, a lock buckle is provided between the push rod and the micro switch, which is pushed and rotated by the push rod, and the end of the lock buckle cooperates with the end of the striking rod to lock the striking rod so that the striking rod cannot move to the right, and the striking rod sleeve is provided with a striking compression spring with a rightward pushing force;

[0009] When the push rod applies a thrust to the right, the striking rod unlocks the lock catch and moves to the right to trigger the micro switch;

[0010] The front end of the striking rod is provided with a re-buckle striking point. When the re-buckle striking point applies a leftward pulling force, the striking rod and the lock buckle are re-interlocked.

[0011] A circuit breaker includes a trigger element, a main traction rod, an auxiliary traction rod and an alarm module.

[0012] When the short-circuit tripping and overload alarm are not tripped, in case of overload, the trigger element is a bimetallic element that pushes the auxiliary traction rod, and the auxiliary traction rod pushes the alarm module to realize overload alarm. In case of short circuit, the trigger element is an armature that directly pushes the main traction rod to rotate to realize mechanism tripping;

[0013] In the case of short-circuit tripping alarm and overload tripping, in the case of short-circuit, the trigger element is the armature pushing the auxiliary traction rod, and the auxiliary traction rod pushes the main traction rod to rotate and trip, and at the same time, the auxiliary traction rod pushes the alarm module to realize short-circuit alarm. In the case of overload, the trigger element is the bimetallic element that directly pushes the main traction rod to rotate to realize mechanism tripping;

[0014] When short-circuit tripping and overload tripping alarms occur, in case of overload, the trigger element is a bimetallic element that pushes the auxiliary traction rod, and the auxiliary traction rod pushes the alarm module to realize overload alarm. At the same time, the auxiliary traction rod pushes the main traction rod to rotate and trip. In case of short circuit, the trigger element is the armature that directly pushes the main traction rod to rotate to realize mechanism tripping.

[0015] Preferably, the auxiliary traction rod is provided with a first knock-off portion, a second knock-off portion, a third knock-off portion and a striking push rod portion;

[0016] The main traction rod is provided with a fourth knock-off portion, a fifth knock-off portion and a sixth knock-off portion;

[0017] The third knock-off portion is used to strike the sixth knock-off portion.

[0018] Preferably,

[0019] When used for short-circuit tripping and overload alarm without tripping, the first knock-off portion is knocked off, the fourth knock-off portion is retained, the second knock-off portion is retained, the fifth knock-off portion is knocked off, and the third knock-off portion is knocked off;

[0020] When used for short-circuit trip alarm and overload trip, the fourth knock-off portion and the second knock-off portion are knocked off, and the other knock-off portions are retained;

[0021] When used for short-circuit tripping and overload tripping alarms, the first knock-off portion is knocked off, the fourth knock-off portion is retained, the second knock-off portion is retained, the fifth knock-off portion is knocked off, and the third knock-off portion is retained.

[0022] Preferably,

[0023] When used for short-circuit tripping alarm and overload tripping, the alarm module is an alarm structure of a circuit breaker as claimed in claim 3;

[0024] When used for short-circuit tripping and overload alarm without tripping, the alarm module is an alarm structure of a circuit breaker as claimed in claim 1;

[0025] When used for short-circuit tripping and overload tripping alarms, the alarm module is an alarm structure for a circuit breaker as claimed in claim 3.

[0026] Preferably, the main traction rod is provided with a lever, and the lever is linked to the re-strike point.

[0027] Preferably, the alarm module is arranged in the cavity of the circuit breaker.

[0028] Preferably, the alarm module is arranged in the accessory cavity of the middle cover of the circuit breaker and is located on one side of the handle of the circuit breaker.

[0029] Compared with the prior art, the beneficial effects achieved by the present application are as follows: the magnetic trip alarm structure installed in the accessory cavity is composed of a main traction rod, a secondary traction rod and a magnetic trip alarm module, and the magnetic trip alarm module is composed of a push rod, a lock, a micro switch, a reset tension spring, a striking rod (reset rod), etc.; when a magnetic fault (high current) occurs, the armature strikes the secondary traction rod, and the secondary traction rod simultaneously strikes the main traction rod to trip the mechanism and strikes the push rod of the magnetic trip alarm module, so that the module lock is unlocked, and the striking rod pushes the micro switch to trigger an alarm signal;

[0030] The magnetic overload alarm tripping and thermal overload alarm non-tripping modules are installed in the accessory cavity, which improves the functional replaceability and interchangeability and effectively enhances the scalability of the circuit breaker function.

[0031] The magnetic alarm structure of this application is simple to manufacture, easy to install and maintain, and facilitates intelligent product applications. It is assembled with the circuit breaker body as an accessory. This function can be retrofitted onto conventional circuit breakers as an accessory, effectively solving the need to add this function to an already installed product. This is especially true when the entire product needs to implement this function. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings:

[0033] Figure 1 This is a schematic diagram of the module installation of the present invention;

[0034] Figure 2 This is a structural diagram of the alarm module according to embodiment 1 of the present invention;

[0035] Figure 3 This is a structural diagram of an alarm module according to embodiment 2 of the present invention;

[0036] Figure 4 Schematic diagram of the push rod structure of the present invention;

[0037] Figure 5 This is a schematic diagram of the main traction rod structure of the present invention;

[0038] Figure 6 This is a schematic diagram of the auxiliary traction rod structure of the present invention;

[0039] Figure 7 Schematic diagram of the impact point of the auxiliary traction rod and the impact point of the lever re-buckle according to the present invention;

[0040] Figure 8 Schematic diagram of the thermal alarm and magnetic alarm strike points of the present invention;

[0041] Figure 9 A three-dimensional schematic diagram of embodiment 1 of the present invention Figure 1 ;

[0042] Figure 10 A three-dimensional schematic diagram of embodiment 1 of the present invention Figure 2 ;

[0043] Figure 11 A three-dimensional diagram of embodiment 2 of the present invention Figure 1 ;

[0044] Figure 12 A three-dimensional diagram of embodiment 2 of the present invention Figure 2 ;

[0045] Among them, the micro switch trigger point 51; the first knock-off part a; the second knock-off part b; the third knock-off part 22; the striking push rod part 21; the fourth knock-off part a1; the fifth knock-off part b1; and the sixth knock-off part 221. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0047] In the description of this application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0049] Usually, the circuit breaker overload non-tripping function is installed at the rear end of the circuit breaker. This structure has a single function and is relatively complex to implement. The function is not scalable.

[0050] like Figures 1 to 12 As shown, the alarm module 10 can be designed as a short circuit alarm module in Example 1 or an overload alarm module in Example 2 based on different triggering modes.

[0051] Example 1

[0052] Alarm module for short circuit trip alarm or overload trip alarm:

[0053] The circuit breaker structure includes a main traction rod 1, an auxiliary traction rod 2 and a short-circuit alarm module. The short-circuit alarm module is composed of a push rod 3, a lock 4, a reset compression spring 6, a striking rod 7 (reset rod), a striking compression spring 8, a micro switch 5, etc. The push rod 3 includes a main body and a knock-off part. In this embodiment, the knock-off part of the push rod 3 is knocked off. The circuit breaker also includes an armature 9 and a lever 12. When a short-circuit fault occurs (large current), the armature 9 is attracted by the magnetic yoke to strike the auxiliary traction rod 2, and the auxiliary traction rod 2 strikes the main traction rod 1 to trip the mechanism. One end of the lock 4 rotates around the rotation center, and the end of the other end is hook-shaped, which cooperates with the end of the striking rod 7 to lock the striking rod 7 so that the striking rod 7 cannot move to the right. The auxiliary traction rod 2 strikes the sixth knock-down portion 221 of the main traction rod 1 through the third knock-down portion 22 of the auxiliary traction rod, and simultaneously strikes the push rod 3 through the striking push rod portion 21, so that the push rod 3 overcomes the spring force of the return compression spring 6 and pushes the lock catch 4 to rotate counterclockwise, so that the striking rod 7 is unlocked. The striking rod 7 moves to the right under the push of the striking compression spring 8, triggering the micro switch 5 to output an alarm signal;

[0054] When a short-circuit alarm occurs, a short-circuit trip must occur. After the short-circuit trip, the circuit breaker opens and the armature 9 resets, but the fault causing the short circuit has not yet been eliminated, so the short-circuit alarm cannot be released. Therefore, the striking rod 7 cannot automatically reset after triggering the microswitch 5 to output the alarm signal, and must be reset by a mechanism.

[0055] When the overload trip alarm is triggered, the circuit breaker is disconnected and the bimetallic element 11 is reset. However, the fault that caused the overload has not been eliminated, so the overload alarm cannot be released. Therefore, the striking rod 7 cannot automatically reset after triggering the micro switch 5 to output the alarm signal, and needs to be reset by the mechanism.

[0056] The striking rod 7 (reset rod) is provided with a lever re-engagement striking point 71 that contacts the lever 12. When the lever 12 re-engages, the short-circuit alarm module 10 is reset. When the lever 12 re-engages, the lever 12 drives the striking rod 7 (reset rod) to the left to the reset position. One end of the lock 4 rotates clockwise around the rotation center until the hook-shaped end of the other end engages the end of the striking rod 7, locking the striking rod 7.

[0057] Example 2

[0058] Alarm module when overload alarm does not trip

[0059] The circuit breaker structure includes a main traction rod 1, an auxiliary traction rod 2 and an overload alarm module. The overload alarm module is composed of a push rod 3, a reset compression spring 6, a micro switch 5, etc. The push rod 3 includes a main body and a knock-off part. The circuit breaker also includes a bimetallic element 11. When an overload fault occurs, the bimetallic element 11 bends and hits the auxiliary traction rod 2, and the auxiliary traction rod 2 does not hit the main traction rod 1. At this time, the third knock-off part 22 of the auxiliary traction rod 2 is knocked off, and the mechanism does not trip when overloaded. The auxiliary traction rod 2 hits the push rod 3, and the push rod 3 moves to the right under the impact of the hitting push rod part 21 of the auxiliary traction rod 2. The knock-off part of the push rod 3 triggers the micro switch 5 to output an alarm signal. In this embodiment, the circuit breaker alarms for overload, but the mechanism does not trip when overloaded.

[0060] When the overload alarm is not tripped, since the overload current always exists, the knockable part of the push rod 3 continues to trigger the micro switch 5. If the overload current returns to normal, the bimetallic element 11 is reset, the push rod 3 is reset, and the alarm signal is released.

[0061] Example 3

[0062] A circuit breaker includes a short-circuit alarm module or an overload alarm module.

[0063] The short circuit tripping function must be available. The first knock-off portion a and the second knock-off portion b are on the same auxiliary traction rod 2, and only one of the tripping alarm and the overload alarm can be used.

[0064] The auxiliary traction rod 2 has a striking push rod portion 21 and a third knock-off portion 22. The second knock-off portion b corresponds to the bimetallic element 11, and the first knock-off portion a corresponds to the armature 9. The main traction rod 1 has a fourth knock-off portion a1 corresponding to the first knock-off portion a, and a fifth knock-off portion b1 corresponding to the second knock-off portion b. Only one of the first knock-off portion a and the fourth knock-off portion a1, or the second knock-off portion b and the fifth knock-off portion b1 can exist at the same time (that is, when the first knock-off portion a exists, the fourth knock-off portion a1 needs to be knocked out, and when the second knock-off portion b exists, the fifth knock-off portion b1 needs to be knocked out), and the end faces of the first knock-off portion a and the fourth knock-off portion a1 are consistent with the corresponding positions of the armature 9, and the end faces of the second knock-off portion b and the fifth knock-off portion b1 are consistent with the corresponding positions of the bimetallic element 11, so the first knock-off portion a, the fourth knock-off portion a1, the second knock-off portion b, and the fifth knock-off portion b1 are all knockable portions. The main traction rod 1 is provided with a sixth knock-off portion 221 corresponding to the third knock-off portion 22 , and the third knock-off portion 22 is a knock-off portion.

[0065] When short circuit tripping and overload alarm are not tripped, see Figure 5 、 Figure 6 、 Figure 11 and Figure 12, knocking off the first knock-off part a, the fifth knock-off part b1 and the third knock-off part 22. When overloaded, the bimetallic element 11 pushes the second knock-off part b of the auxiliary traction rod 2, and the second knock-off part b of the auxiliary traction rod 2 pushes the alarm module to realize overload alarm by hitting the push rod part 21. Since the first knock-off part a, the fifth knock-off part b1 and the third knock-off part 22 are knocked off, when the bimetallic element 11 pushes the second knock-off part b of the auxiliary traction rod 2, the auxiliary traction rod 2 cannot push the main traction rod 1 to realize tripping. When short-circuited, the armature directly pushes the fourth knock-off part a1 to rotate the main traction rod 1 to realize mechanism tripping. This situation corresponds to the overload alarm module of Example 2.

[0066] To realize short circuit trip alarm and overload trip, see Figure 5 、 Figure 6 、 Figure 9 and Figure 10 , knocking off the fourth knock-off part a1 and the second knock-off part b. When short-circuited, the armature 9 pushes the first knock-off part a of the auxiliary traction rod 2, and the first knock-off part a pushes the sixth knock-off part 221 through 22 to drive the main traction rod 1 to rotate and trip. At the same time, the auxiliary traction rod 2 pushes the alarm module to realize a short-circuit alarm by hitting the push rod part 21. When overloaded, the bimetallic element 11 directly pushes the fifth knock-off part b1 to rotate the main traction rod 1 to realize the mechanism tripping. Since the second knock-off part b has been knocked off, the alarm signal can only be a short-circuit alarm. This situation corresponds to the short-circuit alarm module of Example 1.

[0067] When short circuit tripping and overload tripping alarm are realized, see Figure 5 、 Figure 6 、 Figure 11 and Figure 12 , knocking off the first knock-off portion a and the fifth knock-off portion b1. In the event of an overload, the bimetallic element 11 pushes the second knock-off portion b of the secondary traction rod 2. This strikes the push rod 21, pushing the alarm module to trigger an overload alarm. The third knock-off portion 22 pushes the sixth knock-off portion 221, triggering an overload trip. In the event of a short circuit, the armature directly pushes the fourth knock-off portion a1, rotating the main traction rod 1 and tripping the mechanism. This scenario corresponds to the overload alarm module of Example 1.

[0068] By setting different knockout parts on the main traction rod 1 and the auxiliary traction rod 2, only one set of molds is needed to produce accessories for products with different functions, thereby improving production efficiency and reducing production costs.

[0069] It should be noted that, in this document, relational terms such as first and second, etc., are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or device. Finally, it should be noted that the above are only preferred embodiments of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An alarm structure for a circuit breaker, characterized in that: The invention comprises a push rod (3), a return compression spring (6) sleeved on the push rod (3), and a micro switch (5) triggered by the push rod (3).

2. The alarm structure of a circuit breaker according to claim 2, characterized in that: The push rod (3) comprises a body and a knockable portion.

3. The alarm structure of a circuit breaker according to claim 2, characterized in that: After the knockable portion of the push rod (3) is knocked off, a lock buckle (4) is provided between the push rod (3) and the micro switch, and the lock buckle is rotated by the push rod (3). The end of the lock buckle cooperates with the end of the striking rod 7 to lock the striking rod (7) so that the striking rod (7) cannot move to the right. The striking rod (7) is provided with a striking compression spring (8) that pushes the striking rod (7) to the right. When the push rod (3) applies a thrust to the right, the striking rod (7) unlocks the lock catch (4) and moves to the right to trigger the micro switch (5); The front end of the striking rod (7) is provided with a re-buckle striking point (71). When the re-buckle striking point (71) applies a leftward pulling force, the striking rod (7) and the lock buckle (4) are re-interlocked.

4. A circuit breaker, characterized in that: It comprises a trigger element, a main traction rod (1), an auxiliary traction rod (2) and an alarm module (10). When the short circuit tripping and overload alarm are not tripped, in the case of overload, the trigger element is a bimetallic element (11) that pushes the auxiliary traction rod (2), and the auxiliary traction rod (2) pushes the alarm module (10) to realize the overload alarm. In the case of short circuit, the trigger element is an armature (9) that directly pushes the main traction rod (1) to rotate to realize the mechanism tripping; During short-circuit tripping alarm and overload tripping, in case of short-circuit, the trigger element is the armature (9) pushing the auxiliary traction rod (2), and the auxiliary traction rod (2) pushes the main traction rod (1) to rotate and trip, and at the same time, the auxiliary traction rod (2) pushes the alarm module (10) to realize short-circuit alarm, and in case of overload, the trigger element is the bimetallic element (11) directly pushing the main traction rod (1) to rotate and realize mechanism tripping; When short-circuit tripping and overload tripping alarms are triggered, in the case of overload, the trigger element is a bimetallic element (11) that pushes the auxiliary traction rod (2), and the auxiliary traction rod (2) pushes the alarm module (10) to realize overload alarm. At the same time, the auxiliary traction rod (2) pushes the main traction rod (1) to rotate and trip. In the case of short-circuit, the trigger element is an armature (9) that directly pushes the main traction rod (1) to rotate and realize mechanism tripping.

5. A circuit breaker according to claim 4, characterized in that: The auxiliary traction rod (2) is provided with a first knock-off portion (a), a second knock-off portion (b), a third knock-off portion (22) and a striking push rod portion (21); The main traction rod (1) is provided with a fourth knock-off portion (a1), a fifth knock-off portion (b1) and a sixth knock-off portion (221); The third knock-off portion (22) is used to strike the sixth knock-off portion (221).

6. A circuit breaker according to claim 5, characterized in that: When used for short-circuit tripping and overload alarm without tripping, the first knock-off portion (a) is knocked off, the fourth knock-off portion (a1) is retained, the second knock-off portion (b) is retained, the fifth knock-off portion (b1) is knocked off, and the third knock-off portion (22) is knocked off; When used for short-circuit tripping alarm and overload tripping, the fourth knock-off portion (a1) and the second knock-off portion (b) are knocked off, and the other knock-off portions are retained; When used for short-circuit tripping and overload tripping alarms, the first knock-off portion (a) is knocked off, the fourth knock-off portion (a1) is retained, the second knock-off portion (b) is retained, the fifth knock-off portion (b1) is knocked off, and the third knock-off portion (22) is retained.

7. A circuit breaker according to any one of claims 4 to 6, characterized in that: When used for short-circuit tripping alarm and overload tripping, the alarm module (10) is an alarm structure of a circuit breaker as claimed in claim 3; When used for short-circuit tripping and overload alarm without tripping, the alarm module (10) is an alarm structure of a circuit breaker as claimed in claim 1; When used for short-circuit tripping and overload tripping alarms, the alarm module (10) is an alarm structure for a circuit breaker as claimed in claim 3.

8. A circuit breaker according to claim 7, characterized in that: The main traction rod (1) is provided with a lever (12), and the lever (12) is linked with the re-clamping striking point (71).

9. The circuit breaker according to claim 4, characterized in that: The alarm module (10) is arranged in the cavity of the circuit breaker.

10. A circuit breaker according to claim 9, characterized in that: The alarm module (10) is arranged in the accessory cavity of the middle cover of the circuit breaker and is located on one side of the handle of the circuit breaker.

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