Circuit breaker with tripping mechanism

Abstract

The utility model provides a circuit breaker with a tripping mechanism. The circuit breaker comprises a circuit breaker main body. A tripping piece is arranged on the circuit breaker main body in a swinging manner, a first spring is connected to the tripping piece, the other end of the first spring sleeves an adjusting cam, the adjusting cam is rotatably arranged on the circuit breaker main body, and a locking assembly is arranged between the adjusting cam and the circuit breaker main body; a driving assembly and a reset assembly are arranged on the circuit breaker main body, the driving assembly comprises an electromagnet, a driving rod is slidably arranged in the electromagnet, and the driving rod penetrates through the tripping piece; the reset assembly comprises a pressing block slidably arranged on the circuit breaker body, the pressing block is provided with a limiting groove corresponding to the swing track of the tripping piece, and the side, facing the pressing block, of the tripping piece is provided with a guide protrusion. According to the utility model, by arranging the rotatable adjusting cam and the locking assembly, on-site flexible adjustment of tripping action current of the circuit breaker is realized, and a user can set proper protection parameters according to actual requirements.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to a circuit breaker with a tripping mechanism. Background Technology

[0002] Circuit breakers, as critical safety guardians in electrical systems, are primarily responsible for quickly cutting off current upon detecting abnormal conditions in the circuit, such as overload, short circuit, or leakage. This prevents serious accidents like damage to electrical equipment and fires, ensuring the safety of people and property. In modern power systems, circuit breakers are widely used in various fields, including industry, commerce, and residential applications, and are fundamental to ensuring the stable and reliable operation of the power system.

[0003] Among numerous circuit anomalies, leakage current is a relatively hidden but extremely dangerous type of fault. Leakage current occurs when the insulation of electrical equipment fails or a person accidentally touches a live part, which can lead not only to electric shock but also to electrical fires. Therefore, the leakage current tripping mechanism in circuit breakers, specifically designed for detecting and handling leakage current faults, is particularly important. It can monitor the leakage current in the circuit in real time, and once it exceeds a set safety threshold, it will immediately trigger the circuit breaker to trip, cutting off the power supply and preventing further escalation of the accident. However, the traditional process of restoring a circuit breaker to the closed state is somewhat complex.

[0004] Furthermore, to achieve more refined circuit protection, such as in multi-level power distribution systems, it is necessary to implement graded protection by setting different levels of tripping currents to ensure that only the faulty line is disconnected when a fault occurs, rather than the entire system. This requires that the tripping current of the circuit breaker can be adjusted according to actual needs. However, the tripping current of mainstream molded case circuit breakers on the market is usually fixed during the manufacturing process, and users cannot flexibly adjust it on-site according to actual protection requirements. This fixed tripping current setting may lead to an excessively large or small protection range in some cases, failing to achieve optimal protection. For example, if the tripping current is set too small, it may cause false tripping due to normal load fluctuations; if it is set too large, it may fail to disconnect the fault current in time, leading to equipment damage.

[0005] In summary, traditional circuit breakers have certain limitations in manual reset operation after handling leakage faults and in the fixedness of tripping current. Utility Model Content

[0006] The purpose of this invention is to provide a circuit breaker with a tripping mechanism, which enables on-site adjustment of the tripping current and provides a convenient reset operation.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A circuit breaker with a tripping mechanism, characterized in that it includes a circuit breaker body;

[0009] The circuit breaker body is swayably provided with a tripping component, the tripping component is connected to a first spring, the other end of the first spring is fitted onto an adjusting cam, the adjusting cam is rotatably provided on the circuit breaker body, and a locking component is provided between the adjusting cam and the circuit breaker body;

[0010] The circuit breaker body is provided with a drive assembly and a reset assembly. The drive assembly includes an electromagnet, and a drive rod is slidably disposed inside the electromagnet. The drive rod passes through the tripping member.

[0011] The reset assembly includes a push block that can be slidably disposed on the circuit breaker body. The push block has a limiting groove corresponding to the swing trajectory of the tripping member. The tripping member has a guide protrusion on the side facing the push block.

[0012] Furthermore, the circuit breaker body is provided with positioning baffles, and a channel is formed between the positioning baffles for the push block to slide.

[0013] Furthermore, the push block is provided with a guide groove for the drive rod to pass through, and one end of the drive rod is connected to a shaft head, the diameter of which is greater than the width of the guide groove.

[0014] Furthermore, a second spring is provided between the push block and the circuit breaker body.

[0015] Furthermore, the locking assembly includes an external gear ring fixed to the circuit breaker body, an adjusting gear slidably disposed within the external gear ring, the adjusting gear being coaxially disposed with the adjusting cam, and the adjusting gear meshing with the external gear ring.

[0016] Furthermore, a third spring is provided between the adjusting gear and the external gear ring.

[0017] Furthermore, the adjusting gear is provided with a turning cavity, the cross-section of which is polygonal.

[0018] Furthermore, a fourth spring is provided between the drive rod and the electromagnet.

[0019] The beneficial effects of this utility model are as follows:

[0020] This invention enables flexible on-site adjustment of the circuit breaker tripping current by setting a rotatable adjusting cam and a locking component. Users can set appropriate protection parameters according to actual needs, thereby improving the flexibility and reliability of circuit protection. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0023] Figure 2 This is a cross-sectional view of an embodiment of the present invention;

[0024] Figure 3 This is a cross-sectional view of the driving component in one embodiment of the present invention;

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Circuit breaker body;

[0027] 11. Fasteners;

[0028] 111. First spring; 112. Guide protrusion; 113. Guide groove;

[0029] 12. Adjust the cam;

[0030] 13. Electromagnet;

[0031] 131. Drive rod; 1311. Shaft head; 132. Fourth spring;

[0032] 14. Press block; 141. Limiting groove;

[0033] 15. Positioning baffle;

[0034] 16. External gear ring;

[0035] 161. Adjusting gear; 162. Third spring; 163. Twisting chamber. Detailed Implementation

[0036] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product.

[0037] It will be understood by those skilled in the art that certain well-known structures and their descriptions may be omitted in the accompanying drawings. The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0038] like Figure 1-3 As shown, this utility model discloses a circuit breaker with a tripping mechanism, which mainly consists of a circuit breaker body 1, a tripping component 11, a first spring 111, an adjusting cam 12, a locking component, a driving component, and a reset component.

[0039] The circuit breaker body 1 is the main frame of the circuit breaker, which contains the necessary circuit connections and switching mechanisms (not shown in the figure). Its structure is known to those skilled in the art, so it will not be described in detail here.

[0040] The trip unit 11 is pivotally mounted on the circuit breaker body 1, with one end connected to the circuit breaker's switching mechanism (not shown in the figure) to drive the switching mechanism to disconnect the circuit in the event of a fault. The other end of the trip unit 11 is connected to a first spring 111, the other end of which is mounted on an adjusting cam 12.

[0041] The adjusting cam 12 is rotatably mounted on the circuit breaker body 1. By rotating the adjusting cam 12, the preload of the first spring 111 can be changed, thereby adjusting the tripping threshold of the tripping element 11, i.e. the tripping current.

[0042] The locking assembly is used to lock the adjusting cam 12 in a set position to prevent accidental rotation and ensure the stability of the tripping current. Specifically, the locking assembly includes an outer gear ring 16 fixed to the circuit breaker body 1 and an adjusting gear 161 slidably disposed within the outer gear ring 16. The adjusting gear 161 is coaxially arranged with the adjusting cam 12 and meshes with the outer gear ring 16. A third spring 162 is provided between the adjusting gear 161 and the outer gear ring 16 to provide a certain frictional force to ensure the reliability of the locking. The adjusting gear 161 is provided with a polygonal cross-section turning cavity 163 to facilitate rotational adjustment by the user using tools.

[0043] The drive assembly is used to actuate the trip unit 11 when a circuit fault is detected. The drive assembly includes an electromagnet 13 and a drive rod 131 slidably disposed within the electromagnet 13. The drive rod 131 passes through the trip unit 11. A fourth spring 132 is disposed between the drive rod 131 and the electromagnet 13 for resetting the drive rod 131 after the electromagnet 13 is de-energized.

[0044] The reset assembly is used to reset the tripping mechanism after fault clearance, enabling the circuit breaker to reclose. The reset assembly includes a push block 14 slidably mounted on the circuit breaker body. The push block 14 has a limiting groove 141 corresponding to the swing trajectory of the tripping element 11, and a guide protrusion 112 is provided on the side of the tripping element 11 facing the push block 14. A positioning baffle 15 is provided on the circuit breaker body, forming a channel for the push block 14 to slide, ensuring the sliding direction of the push block 14. A conductive groove 113 is provided on the push block 14 for the drive rod 131 to pass through, and one end of the drive rod 131 is connected to a shaft head 1311 with a diameter larger than the width of the conductive groove 113. A second spring is provided between the push block 14 and the circuit breaker body to automatically reset the push block 14 after the reset operation is completed.

[0045] The working principle of this utility model is as follows:

[0046] Under normal operating conditions, the switching mechanism of the circuit breaker body 1 is in the closed state. The tripping element 11 is held in a certain initial position by the action of the first spring 111. The adjusting cam 12 is locked at a set angle by the locking assembly, which determines the preload of the first spring 111, thereby setting the tripping current of the circuit breaker. The electromagnet 13 in the drive assembly is in the de-energized state, and the drive rod 131 is in the extended state by the action of the fourth spring 132, which does not affect the movement of the tripping element 11. The push block 14 in the reset assembly is in the initial position by the action of the second spring, and its limiting groove 141 does not interfere with the swing of the tripping element 11.

[0047] When an overload, short circuit, or leakage fault occurs in the circuit, the detection circuit (not shown in the figure) associated with electromagnet 13 will detect the abnormal current signal and drive electromagnet 13 to be energized. After being energized, electromagnet 13 generates magnetic force, attracting drive rod 131 to move backward against the elastic force of fourth spring 132. Drive rod 131 moves and pulls tripping element 11 to swing. The swing of tripping element 11 will trigger the switching mechanism of the circuit breaker to operate, causing the circuit breaker to quickly trip and disconnect the faulty circuit, thereby protecting electrical equipment and personal safety.

[0048] When it is necessary to adjust the tripping current of the circuit breaker, the user can use a suitable tool to insert into the turning cavity 163 on the adjusting gear 161, push the adjusting gear 161 to disengage it from the outer gear ring 16, and then rotate the adjusting gear 161. The rotation of the adjusting gear 161 will drive the adjusting cam 12 to rotate. The rotation of the adjusting cam 12 will change the compression or extension of the first spring 111, thereby changing the preload of the first spring 111 on the tripping element 11. The change in preload directly affects the force that the drive rod 131 needs to overcome, thus changing the tripping current of the circuit breaker. After the adjustment is completed, release the tool, and the elastic force provided by the third spring 162 will cause the adjusting gear 161 to re-engage with the outer gear ring 16, thereby locking the adjusting cam 12.

[0049] After troubleshooting, the circuit breaker needs to be reset to return to the closed position. The user needs to press the push block 14 in the reset assembly. When the limit groove 141 on the push block 14 moves to coincide with the swing trajectory of the trip member 11, the push block 14 will no longer block the guide protrusion 112, so the trip member 11 can swing to the closed position. At this time, the circuit breaker's switching mechanism can be reclosed to restore power supply.

[0050] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A circuit breaker having a trip mechanism, characterized by: The circuit breaker body is provided with a trip unit swingably, the trip unit is connected with a first spring, the other end of the first spring is sleeved on an adjusting cam, the adjusting cam is rotatably arranged on the circuit breaker body, and a locking assembly is arranged between the adjusting cam and the circuit breaker body. The circuit breaker body is provided with a driving assembly and a reset assembly, the driving assembly comprises an electromagnet, a driving rod is slidably arranged in the electromagnet, and the driving rod penetrates the trip unit. The reset assembly comprises a pressing block slidably arranged on the circuit breaker body, a limiting slot corresponding to the swing track of the trip unit is formed in the pressing block, and a guide protrusion is arranged on the side of the trip unit facing the pressing block. Positioning flaps are arranged on the circuit breaker body, and a channel for the pressing block to slide is formed between the positioning flaps.

2. The circuit breaker having a trip unit according to claim 1, wherein A through groove is arranged on the pressing block for the driving rod to penetrate, and a shaft head is connected to one end of the driving rod, the width of the shaft head is greater than that of the through groove.

3. The circuit breaker having a trip unit according to claim 1, wherein A second spring is arranged between the pressing block and the circuit breaker body.

4. The circuit breaker having a trip unit according to claim 1, wherein The locking assembly comprises an outer gear ring fixed on the circuit breaker body, an adjusting gear is slidably arranged in the outer gear ring, the adjusting gear is coaxially arranged with the adjusting cam, and the adjusting gear is engaged with the outer gear ring.

5. The circuit breaker having a trip unit of claim 1 wherein, A third spring is arranged between the adjusting gear and the outer gear ring.

6. The circuit breaker having a trip unit according to claim 5, wherein, A screwing cavity is arranged on the adjusting gear, and the cross section of the screwing cavity is polygonal.

7. The circuit breaker having a trip unit of claim 5 wherein, A fourth spring is arranged between the driving rod and the electromagnet.

8. The circuit breaker having a trip unit of claim 1, wherein, ​

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