Alarm structure of circuit breaker and circuit breaker

Abstract

The application relates to a circuit breaker, in particular to a circuit breaker alarm structure and a circuit breaker. The circuit breaker alarm structure of the application, for example, short-circuit tripping alarm, overload tripping alarm or overload alarm non-tripping module installation acts on an accessory cavity, improves the replaceability and interchangeability of functions, and effectively improves the expandability of the functions of the circuit breaker.

Description

Technical Field

[0001] This application relates to a circuit breaker, specifically an alarm structure for a circuit breaker and the circuit breaker itself. Background Technology

[0002] In the field of low-voltage electrical appliances, to cope with various complex application environments, there are diverse requirements for the use of circuit breakers. When a line fault trips, the circuit breaker can output the fault type and issue an alarm signal. Therefore, there are application scenarios where thermal overload alarm and magnetic overload alarm tripping can be selected. When there is a short circuit or overload fault in the circuit, the fault current triggers the tripping, the circuit breaker cuts off the fault current, protects the circuit breaker, and outputs an alarm signal.

[0003] Chinese Patent CN 210129473 U discloses a thermal overload alarm non-tripping device for a molded case circuit breaker. The device includes a bracket, a bimetallic strip assembly, a traction rod rotatably mounted on the bracket, an alarm switch fixedly mounted on the bracket, and a return spring acting on the traction rod. A trigger block is provided on the traction rod corresponding to the alarm switch to activate it. When the circuit breaker is not overloaded, the return spring pulls the traction rod, causing the trigger block to actuate the alarm switch, placing it in a first state. When the circuit breaker is overloaded, the bimetallic strip assembly drives the traction rod to rotate. After the traction rod rotates a certain angle, the trigger block releases the alarm switch, placing it in a second state and outputting an overload alarm signal. This tripping overload alarm method operates at the rear end of the circuit breaker. The alarm signal passes through the accessory cavity via complex wiring, making installation complicated, inconvenient to assemble, and increasing the product assembly steps.

[0004] Chinese Patent CN 219658640 U describes an overload alarm non-tripping device comprising a base, a heating element, a bimetallic strip that bends upon heating, an actuating rod, a microswitch, and a bracket for mounting the microswitch. The heating 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 the bracket. Its working principle is as follows: When the current in the circuit containing the circuit breaker reaches a set value, the bimetallic strip is heated by the heating element to produce sufficient deformation, which in turn moves the actuating rod to activate the microswitch. The microswitch closes, thus connecting the alarm circuit and sending an alarm signal to the user. After the heating element cools down, the bimetallic strip gradually recovers its deformation, causing the actuating rod to move away from the microswitch and deactivate the alarm. Alternatively, the actuating rod can be omitted, and the end of the bimetallic strip, after heating, directly contacts the microswitch to connect the alarm circuit. Or, a push rod can be connected to the end of the bimetallic strip, and the push rod contacts the microswitch after the bimetallic strip is heated to connect the alarm circuit. This trip overload alarm method operates at the back end of the circuit breaker. The alarm signal passes through the accessory cavity through complex wiring, making the installation process complicated, inconvenient to assemble, and increasing the product assembly steps. Utility Model Content

[0005] To solve the above-mentioned technical problems, this application provides the following technical solution:

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

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

[0008] Preferably, after the knockable part of the push rod is knocked off, a latch is provided between the push rod and the micro switch, which is rotated by the push rod. The end of the latch cooperates with the end of the striking rod to lock the striking rod so that the striking rod cannot move to the right. The striking rod is fitted with a striking spring that exerts a rightward pushing force.

[0009] When the push rod applies a push force to the right, the striking rod unlocks from the latch and moves to the right to trigger the micro switch;

[0010] The front end of the striking rod is provided with a re-clamping striking point. When a leftward pulling force is applied to the re-clamping striking point, the striking rod and the latch re-interlock.

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

[0012] When the short circuit trip and overload alarm do not trip, in case of overload, the triggering element is a bimetallic element that pushes the auxiliary traction rod, and the auxiliary traction rod pushes the alarm module to realize the overload alarm. In case of short circuit, the triggering element is an armature that directly pushes the main traction rod to rotate to realize the mechanism trip.

[0013] In the event of a short circuit trip alarm and overload trip, during a short circuit, the triggering element is an armature that pushes the auxiliary traction rod, which in turn pushes the main traction rod to rotate and trip. At the same time, the auxiliary traction rod pushes the alarm module to trigger a short circuit alarm. During an overload, the triggering element is a bimetallic element that directly pushes the main traction rod to rotate and trip the mechanism.

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

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

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

[0017] The third knockdown section is used to strike the sixth knockdown section.

[0018] Preferably,

[0019] When the short-circuit tripping and overload alarm do not trip, the first knock-off part is knocked off, the fourth knock-off part is retained, the second knock-off part is retained, the fifth knock-off part is knocked off, and the third knock-off part is knocked off.

[0020] When used for short-circuit trip alarm and overload trip, the fourth knock-out part and the second knock-out part are knocked out, while the other knock-out parts are retained.

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

[0022] Preferably,

[0023] When used for short-circuit trip alarm and overload trip, the alarm module is an alarm structure of a circuit breaker as described above.

[0024] When used for short-circuit tripping and overload alarm non-tripping, the alarm module is an alarm structure of a circuit breaker as described above.

[0025] When used for short-circuit tripping and overload tripping alarms, the alarm module is an alarm structure of a circuit breaker as described above.

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

[0027] Preferably, the alarm module is located inside the cavity of the circuit breaker.

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

[0029] Compared with the prior art, the beneficial effects achieved by this application are as follows: The magnetic trip alarm structure installed in the accessory cavity consists of a main traction rod, a secondary traction rod, and a magnetic trip alarm module. The magnetic trip alarm module consists of a push rod, a latch, a micro switch, a reset spring, and a striking rod (reset rod). In the event of a magnetic fault (high current), the armature strikes the secondary traction rod, which simultaneously strikes the main traction rod, causing the mechanism to trip and striking the push rod of the magnetic trip alarm module, thus unlocking the module latch. The striking rod then pushes the micro switch to trigger the alarm signal.

[0030] The magnetic overload alarm tripping and thermal overload alarm non-tripping modules are installed in the accessory cavity, improving the replaceability and interchangeability of functions, and effectively enhancing the expandability of circuit breaker functions.

[0031] The magnetic alarm structure of this application is simple in process, easy to install and maintain, and facilitates intelligent application of the product. It is assembled with the circuit breaker body as an accessory. This function can be retrofitted as an accessory to conventional circuit breakers, effectively solving the need to add this function after the product has already been installed, and addressing situations where the entire product needs to implement this function. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the present application and form part of the specification. They are used together with the embodiments of the present application to explain the application and do not constitute a limitation thereof. In the drawings:

[0033] Figure 1 This is a schematic diagram of the module installation of this utility model;

[0034] Figure 2 This is a schematic diagram of the alarm module structure in Embodiment 1 of this utility model;

[0035] Figure 3 This is a schematic diagram of the alarm module structure in Embodiment 2 of this utility model;

[0036] Figure 4 This is a schematic diagram of the push rod structure of this utility model;

[0037] Figure 5 This is a schematic diagram of the main traction rod structure of this utility model;

[0038] Figure 6 This is a schematic diagram of the auxiliary traction rod structure of this utility model;

[0039] Figure 7 This is a schematic diagram of the secondary traction rod impact point and the lever re-clamping impact point of this utility model;

[0040] Figure 8 This is a schematic diagram of the thermal alarm and magnetic alarm strike points of this utility model;

[0041] Figure 9 This is a three-dimensional schematic diagram of Embodiment 1 of the present utility model. Figure 1 ;

[0042] Figure 10 This is a three-dimensional schematic diagram of Embodiment 1 of the present utility model. Figure 2 ;

[0043] Figure 11 This is a three-dimensional schematic diagram of Embodiment 2 of the present utility model. Figure 1 ;

[0044] Figure 12This is a three-dimensional schematic diagram of Embodiment 2 of the present utility model. 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 Implementation

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0047] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] The overload non-tripping function of a circuit breaker is usually installed at the back end of the circuit breaker. This structure has a single function and is relatively complex to implement. It also has poor expandability.

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

[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, a secondary traction rod 2, and a short-circuit alarm module. The short-circuit alarm module consists of a push rod 3, a latch 4, a reset spring 6, a strike rod 7 (reset rod), a strike spring 8, and a micro switch 5. The push rod 3 includes a body and a knockable part; in this embodiment, the knockable part of the push rod 3 is knocked off. The circuit breaker also includes an armature 9 and a lever 12. In the event of a short-circuit fault (high current), the armature 9 is attracted by the magnetic yoke and strikes the secondary traction rod 2, which in turn strikes the main traction rod 1, causing the mechanism to disengage. One end of the latch 4 rotates around its rotation center, while the other end is hook-shaped and engages with the end of the strike rod 7, locking the strike rod 7 and preventing it from moving to the right. The auxiliary traction rod 2 strikes the sixth knocking part 221 of the main traction rod 1 through the third knocking part 22 of the auxiliary traction rod, and at the same time strikes the push rod 3 through the striking push rod part 21. This causes the push rod 3 to overcome the spring force of the reset spring 6 and push the latch 4 to rotate counterclockwise, thereby unlocking the striking rod 7. The striking rod 7 moves to the right under the push of the striking spring 8, triggering the micro switch 5 to output an alarm signal.

[0054] When a short circuit alarm occurs, the circuit breaker must trip. After tripping, the circuit breaker opens and armature 9 resets, but the fault causing the short circuit is not eliminated, so the short circuit alarm cannot be cleared. Therefore, the strike lever 7 cannot automatically reset after triggering the microswitch 5 to output an alarm signal; it needs to be reset again via a mechanism.

[0055] When an overload trip alarm occurs, the circuit breaker opens after tripping, and the bimetallic element 11 resets. However, the fault causing the overload has not been eliminated, so the overload alarm cannot be cleared. Therefore, the strike lever 7 cannot automatically reset after triggering the microswitch 5 to output an alarm signal; it needs to be reset again via a mechanism.

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

[0057] Example 2

[0058] Alarm module when overload alarm does not trip

[0059] The circuit breaker structure includes a main traction rod 1, a secondary traction rod 2, and an overload alarm module. The overload alarm module consists of a push rod 3, a reset spring 6, and a micro switch 5. The push rod 3 includes a body and a knock-out portion. The circuit breaker also includes a bimetallic element 11. In case of an overload fault, the bimetallic element 11 bends and strikes the secondary traction rod 2, but the secondary traction rod 2 does not strike the main traction rod 1. At this time, the third knock-out portion 22 of the secondary traction rod 2 is knocked out, and the mechanism does not trip under overload. The secondary traction rod 2 strikes the push rod 3, and the push rod 3 moves to the right under the strike of the push rod portion 21 of the secondary traction rod 2. The knock-out portion of the push rod 3 triggers the micro switch 5 to output an alarm signal. In this embodiment, the circuit breaker alarms under overload, but the mechanism does not trip under overload.

[0060] When the overload alarm fails to trip, the knockable part of push rod 3 continuously triggers micro switch 5 because the overload current persists. If the overload current returns to normal, bimetallic element 11 resets, push rod 3 resets, and the alarm signal is cleared.

[0061] Example 3

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

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

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

[0065] When achieving short-circuit tripping and overload alarm without tripping, see Figure 5 , Figure 6 , Figure 11 and Figure 12The first knock-off part a, the fifth knock-off part b1, and the third knock-off part 22 are knocked off. In case of overload, the bimetallic element 11 pushes the second knock-off part b of the auxiliary traction rod 2, which in turn strikes the push rod part 21 to activate the alarm module, triggering an overload alarm. Because the first knock-off part a, the fifth knock-off part b1, and the third knock-off part 22 are knocked off, the auxiliary traction rod 2 cannot push the main traction rod 1 to disengage when the bimetallic element 11 pushes the second knock-off part b. In case of a short circuit, the armature directly pushes the fourth knock-off part a1, causing the main traction rod 1 to rotate and disengage the mechanism. This corresponds to the overload alarm module in Embodiment 2.

[0066] When implementing short-circuit trip alarm and overload trip, see Figure 5 , Figure 6 , Figure 9 and Figure 10 The fourth knock-off part a1 and the second knock-off part b are knocked off. In the event of a short circuit, the armature 9 pushes the first knock-off part a of the auxiliary traction rod 2. The first knock-off part a, through 22, pushes the sixth knock-off part 221, causing the main traction rod 1 to rotate and disengage. Simultaneously, the auxiliary traction rod 2, through the strike push rod part 21, pushes the alarm module to achieve a short circuit alarm. In the event of an overload, the bimetallic element 11 directly pushes the fifth knock-off part b1, causing the main traction rod 1 to rotate and disengage the mechanism. Since the second knock-off part b has already been knocked off, the alarm signal can only be a short circuit alarm. This situation corresponds to the short circuit alarm module in Embodiment 1.

[0067] When implementing short-circuit tripping and overload tripping alarms, see Figure 5 , Figure 6 , Figure 11 and Figure 12 The first knock-off part a and the fifth knock-off part b1 are knocked off. In case of overload, the bimetallic element 11 pushes the second knock-off part b of the auxiliary traction rod 2. The second knock-off part b of the auxiliary traction rod 2 then triggers the alarm module via the push rod part 21 to trigger an overload alarm, and the third knock-off part 22 pushes the sixth knock-off part 221 to trigger overload tripping. In case of short circuit, the armature directly pushes the fourth knock-off part a1, causing the main traction rod 1 to rotate and trigger the mechanism. This corresponds to the overload alarm module in Embodiment 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 accommodate the production of accessories for different functional products, thereby improving production efficiency and reducing production costs.

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

Claims

1. An alarm structure for a circuit breaker, characterized in that, Includes a push rod (3), a reset spring (6) sleeved on the push rod (3), and a micro switch (5) triggered by the push rod (3); The push rod (3) includes a body and a knock-off part; After the knockable part of the push rod (3) is knocked off, a latch (4) is provided between the push rod (3) and the micro switch (5), which is driven to rotate by the push rod (3). The end of the latch 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 fitted with a striking spring (8) that pushes to the right. When the push rod (3) applies a push force to the right, the strike rod (7) unlocks from the latch (4) and moves to the right to trigger the micro switch (5). The striking rod (7) has a re-clamping striking point (71) at its front end. When the re-clamping striking point (71) applies a leftward pulling force, the striking rod (7) and the latch (4) re-interlock.

2. A circuit breaker, characterized in that, It includes a triggering element, a main traction rod (1), a secondary traction rod (2), and an alarm module (10). The triggering element is a bimetallic element (11), which is driven by the auxiliary traction rod (2). The auxiliary traction rod (2) is driven by the alarm module (10) to realize overload alarm. When there is a short circuit, the triggering element is an armature (9), which is driven by the main traction rod (1). The main traction rod (1) rotates to realize the mechanism disengagement. Alternatively, the triggering element may be an armature (9), which engages with the auxiliary traction rod (2) and the main traction rod (1). The main traction rod (1) rotates and disengages, while the auxiliary traction rod (2) engages with the alarm module (10) to achieve a short circuit alarm. In case of overload, the triggering element may be a bimetallic element (11), which engages with the main traction rod (1) to directly push the main traction rod (1) to rotate and achieve mechanism disengagement. Alternatively, the triggering element is a bimetallic element (11) that drives the auxiliary traction rod (2), and the auxiliary traction rod (2) drives the alarm module (10) to achieve overload alarm. At the same time, the auxiliary traction rod (2) drives the main traction rod (1) to rotate and disengage. In the event of a short circuit, the triggering element is an armature (9), and the armature (9) drives the main traction rod (1) to rotate and disengage the mechanism.

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

4. A circuit breaker according to claim 3, characterized in that, The first knock-off part (a) and the third knock-off part (22) are in a removed state, while the second knock-off part (b), the fourth knock-off part (a1) and the fifth knock-off part (b1) are in a retained state. Alternatively, the second knock-off part (b) and the fourth knock-off part (a1) may be in a removed state, while the first knock-off part (a), the third knock-off part (22), and the fifth knock-off part (b1) may be in a retained state. Alternatively, the first knock-off part (a) and the fifth knock-off part (b1) may be in a removed state, while the second knock-off part (b), the third knock-off part (22), and the fourth knock-off part (a1) may be in a retained state.

5. A circuit breaker according to any one of claims 2 to 4, characterized in that, The alarm module (10) is an alarm structure for a circuit breaker as described in claim 3; Alternatively, the alarm module (10) may be an alarm structure for a circuit breaker as described in claim 1.

6. A circuit breaker according to claim 5, characterized in that, When the alarm module (10) is the alarm structure of a circuit breaker as described in claim 3, the main traction rod (1) is provided with a lever (12), and the lever (12) is linked with the re-clamping point (71).

7. A circuit breaker according to claim 2, characterized in that, The alarm module (10) is located inside the cavity of the circuit breaker.

8. A circuit breaker according to claim 7, characterized in that, The alarm module (10) is located in the accessory cavity of the middle cover of the circuit breaker and is located on the handle side of the circuit breaker.

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