Bimetal tripping mechanism of circuit breaker

Abstract

The utility model discloses a bimetal tripping mechanism of a circuit breaker. The bimetal tripping mechanism comprises a middle seat shell, a lock catch, a pull rod and bimetal, the pull rod is provided with a connecting long groove, a guiding long groove and a bending connecting part, the connecting column of the lock catch is movably connected with the connecting long groove, the guiding column on one side of the through groove of the middle base shell is movably connected with the guiding long groove, and moving gaps are reserved at all the connecting parts. The connecting long groove is formed in the pull rod, the connecting column of the lock catch is movably connected with the pull rod, and the error gap is reserved, so that the problem that the lock catch is directly driven to be released due to thermal expansion and cold contraction of bimetal is effectively solved. When the bimetal expands when heated or contracts when cooled, the movable gap between the connecting long groove and the connecting column can provide a buffer space for the size change of the bimetal, so that the situation of false tripping caused by the fact that tiny deformation of the bimetal is directly transmitted to the lock catch is avoided, the working stability and reliability of the circuit breaker are greatly improved, and the service life of the circuit breaker is prolonged. The risk of power supply interruption caused by mistaken arc breaking is reduced, and continuous and stable operation of a power system is guaranteed.

Description

Technical Field

[0001] This utility model relates to the technical field of circuit breakers, specifically to a double-metal tripping mechanism for a circuit breaker. Background Technology

[0002] In modern power systems, circuit breakers are key devices ensuring the safe and stable operation of circuits, and their performance directly affects the reliability of the entire power network. The bimetallic tripping mechanism, as a core component of circuit breaker overload protection, has always been a focus of research and improvement in related fields.

[0003] Traditional bimetallic tripping mechanisms have significant structural design flaws. In most existing designs, the bimetallic strip is either directly connected to the latch via a pull rod or directly connected to the tripping step on the latch. This simple and direct connection method exposes numerous problems in practical applications. Due to the thermal expansion and contraction properties of the bimetallic strip, its volume changes accordingly when the ambient temperature changes or when the circuit generates heat during normal operation. In the rigid connection mode between the bimetallic strip and the latch, even slight thermal expansion and contraction of the bimetallic strip will be directly transferred to the latch without any buffer, leading to frequent accidental tripping. For example, in environments with large temperature fluctuations, or when slight fluctuations in the power load cause a slight increase in the temperature of the bimetallic strip, the latch may trip unexpectedly, causing unintended circuit interruptions. This severely affects the continuity and stability of power supply, causing considerable inconvenience and significant losses to industrial production, commercial operations, and residential lives.

[0004] With continuous technological advancements and increasingly stringent demands for power supply quality across various industries, the market urgently needs a dual-metal trip mechanism that can effectively address the aforementioned issues. Existing dual-metal trip mechanisms can no longer meet the growing demands for high-precision, high-stability circuit protection, necessitating innovation and breakthroughs to improve the overall performance of circuit breakers, reduce the probability of malfunctions, and ensure the safe and reliable operation of the power system. Utility Model Content

[0005] In view of the shortcomings of the prior art, this utility model provides a double metal tripping mechanism for a circuit breaker.

[0006] The technical solution adopted by this utility model is: a double-metal tripping mechanism for a circuit breaker, including a middle housing, a latch, a pull rod, and a double metal part. The pull rod is provided with a connecting long groove, a guide long groove, and a bent connecting part. The latch is provided with a connecting post that is movably connected to the connecting long groove. The middle housing is provided with a through groove. The bent connecting part passes through the through groove and connects to the double metal part. A guide post that is movably connected to the guide long groove is provided on one side of the through groove. There are movable gaps between the connecting long groove and the connecting post, and between the guide long groove and the guide post.

[0007] Furthermore, the double metal is disposed on the back of the middle base shell, one end of which is connected to an arc-guiding plate. The bottom of the arc-guiding plate has a positioning protrusion, and the middle base shell is provided with a positioning groove that engages with the positioning protrusion.

[0008] Furthermore, the latch is provided with a contact limiting post, the contact limiting post is provided with a connecting hole, and the connecting post is connected to the connecting hole.

[0009] Furthermore, the top of the connecting column has a limiting step, and the connecting groove is connected to the connecting column between the limiting step and the contact limiting column.

[0010] Furthermore, both the connecting long groove and the guide long groove are racetrack-shaped structures.

[0011] The beneficial effects of this utility model are:

[0012] Firstly, by setting a connecting slot on the pull rod and allowing the connecting post of the latch to move in connection with it, and by reserving error clearances (movable clearances are provided between the connecting slot and the connecting post, and between the guide slot and the guide post), the problem of the latch being directly disengaged due to thermal expansion and contraction of the bimetallic strip is effectively solved. When the bimetallic strip expands due to heat or contracts due to cold, the movable clearance between the connecting slot and the connecting post provides buffer space for the dimensional changes of the bimetallic strip, avoiding the direct transmission of minor deformations of the bimetallic strip to the latch and causing accidental disengagement. This greatly improves the stability and reliability of the circuit breaker, reduces the risk of power supply interruption due to accidental arc interruption, and ensures the continuous and stable operation of the power system.

[0013] Secondly, the cooperation between the guide slot and the guide post on the middle housing precisely limits the movement trajectory of the pull rod. This design allows the pull rod to move along a predetermined path when subjected to the force of the double metal, avoiding instability factors such as swaying and deviation during the operation. This ensures the accuracy and consistency of the locking and tripping action, effectively improving the circuit breaker's breaking capacity. It enables the circuit breaker to quickly and reliably disconnect the circuit under abnormal conditions such as overload or short circuit, providing more effective protection for power equipment and reducing the risk of equipment damage and maintenance costs caused by circuit faults.

[0014] Furthermore, this innovative structural design helps to extend the overall service life of the circuit breaker. By reducing unnecessary mechanical wear and electrical shocks caused by malfunctions, each component can operate under more stable and reasonable conditions, extending the replacement cycle of key components such as latches, levers, and double metal parts. In the long run, this reduces the maintenance and operating costs of the power system and improves economic efficiency.

[0015] In summary, the double-metal tripping mechanism of this utility model has significant advantages in improving the performance of circuit breakers, ensuring the safe and stable operation of power systems, and reducing overall costs, and has good market application prospects and social benefits.

[0016] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The utility model will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0017] Fig. 1 This is a schematic diagram of the structure of this utility model.

[0018] Fig. 2 This is a structural diagram of the latch and connecting post.

[0019] Fig. 3 This is a schematic diagram of the tie rod.

[0020] Fig. 4 This is a schematic diagram of the back of this utility model.

[0021] Fig. 5 This is a schematic diagram of the back of the middle housing.

[0022] Fig. 6 This is a schematic diagram of the arc-drawing plate structure.

[0023] Figs. 1-6 In the middle: 1. Middle housing; 2. Lock; 3. Pull rod; 4. Double metal; 5. Connecting long slot; 6. Guide long slot; 7. Bending connection part; 8. Connecting post; 9. Through slot; 10. Guide post; 11. Arc priming piece; 12. Positioning protrusion; 13. Positioning groove; 14. Contact limiting post; 15. Connecting hole; 16. Limiting step. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0026] This utility model provides a double metal tripping mechanism for a circuit breaker.

[0027] In this embodiment, refer to Figs. 1-6 The circuit breaker's double-metal tripping mechanism includes a middle housing 1, a latch 2, a pull rod 3, and a double metal part 4. The pull rod 3 is provided with a connecting long groove 5, a guide long groove 6, and a bent connecting part 7. The latch 2 is provided with a connecting post 8 that is movably connected to the connecting long groove. The middle housing is provided with a through groove 9. The bent connecting part passes through the through groove 9 and connects to the double metal part. A guide post 10 that is movably connected to the guide long groove is provided on one side of the through groove 9. There are movable gaps between the connecting long groove and the connecting post, and between the guide long groove and the guide post.

[0028] In the above technical solution, by setting a connecting long slot, a guide long slot, and a bent connecting part on the pull rod, as well as corresponding connecting posts and guide posts, and reserving an activity gap between the connecting long slot and the connecting post, and between the guide long slot and the guide post, the problem of the lock being directly disengaged due to thermal expansion and contraction of the double metal is effectively avoided. This greatly improves the stability and reliability of the circuit breaker operation, reduces the probability of malfunction, ensures the continuous and normal power supply of the power system, and precisely limits the movement trajectory of the pull rod, enhancing the accuracy and consistency of the breaking action and improving the overall performance of the circuit breaker.

[0029] The tie rod is a flat strip structure with a connecting groove on one end and a bent connecting part on the other end. A guide groove is set in the middle, and the bent connecting part passes through the groove to connect with the double metal on the other side. For double P circuit breakers, the overall thickness of the circuit breaker can be reduced.

[0030] Specifically, the double metal is disposed on the back of the middle base shell, one end of which is connected to an arc-guiding piece 11. The bottom of the arc-guiding piece 11 has a positioning protrusion 12, and the middle base shell is provided with a positioning groove 13 that engages with the positioning protrusion.

[0031] In this embodiment, the double metal plate is set on the back of the middle housing and connected to the arc ignition plate. The bottom positioning protrusion of the arc ignition plate is inserted into the positioning groove of the middle housing, making the arc ignition plate more stable. When the circuit breaker breaks the circuit and generates an arc, it can effectively guide the arc, improve the efficiency of arc extinguishing, reduce the risk of arc damage to other internal components of the circuit breaker, and extend the service life of the circuit breaker. At the same time, the overall layout structure of the double metal plate and the arc ignition plate on the middle housing is optimized, enhancing the compactness and coordination of the mechanism, and reducing the overall thickness of the circuit breaker.

[0032] Specifically, the latch 2 is provided with a contact limiting post 14, the contact limiting post 14 is provided with a connecting hole 15, and the connecting post is connected to the connecting hole 15.

[0033] In this embodiment, the contact limiting post and connecting hole on the latch provide a reliable installation position for the connecting post, making the connection structure between the latch and the pull rod more stable. At the same time, it facilitates the connection and assembly of the connecting rod after the connecting post is removed.

[0034] Specifically, the top of the connecting column has a limiting step 16, and the connecting groove 5 is connected to the connecting column between the limiting step and the contact limiting column.

[0035] In this embodiment, after the connecting slot is connected to the connecting post, it is confined between the limiting step and the contact limiting post, preventing the pull rod from detaching from the connecting post. While allowing for thermal expansion and contraction buffering of the bimetallic strip, it prevents excessive movement or detachment of the pull rod, optimizes the fit between the connecting slot and the connecting post, improves the reliability and durability of the bimetallic tripping mechanism during long-term operation, and ensures that the circuit breaker can stably and reliably perform overload protection functions.

[0036] Specifically, both the connecting groove and the guide groove are racetrack-shaped structures.

[0037] In this embodiment, the connecting slot and the guide slot adopt a racetrack-shaped structure. This shape design ensures sufficient clearance to accommodate the thermal expansion and contraction of the bimetallic strip and the movement requirements of the pull rod. Compared with other shapes, it can more effectively restrict the degree of freedom of the pull rod in a specific direction, making the pull rod movement smoother and more stable. It reduces the jamming and shaking during the movement, improves the accuracy and sensitivity of the bimetallic tripping mechanism, and enhances the response speed and breaking performance of the circuit breaker.

[0038] Please note to all technical personnel: Although this utility model has been described according to the specific embodiments above, the concept of this utility model is not limited to this utility model. Any modification that utilizes the concept of this utility model will be included within the scope of protection of this patent right.

Claims

1. A double-metal tripping mechanism for a circuit breaker, comprising a middle housing, a latch, a pull rod, and a double-metal tripping mechanism, characterized in that: The pull rod is provided with a connecting long groove, a guide long groove and a bent connecting part. The buckle is provided with a connecting post that is movably connected to the connecting long groove. The middle base shell is provided with a through groove. The bent connecting part passes through the through groove and is connected to the double metal. A guide post that is movably connected to the guide long groove is provided on one side of the through groove. There are movable gaps between the connecting long groove and the connecting post, and between the guide long groove and the guide post.

2. The bimetallic tripping mechanism of the circuit breaker according to claim 1, characterized in that: The double metal plate is located on the back of the middle housing, and one end of it is connected to an arc-guiding plate. The bottom of the arc-guiding plate has a positioning protrusion, and the middle housing is provided with a positioning groove that engages with the positioning protrusion.

3. The bimetallic tripping mechanism of the circuit breaker according to claim 1, characterized in that: The latch is provided with a contact limiting post, the contact limiting post is provided with a connecting hole, and the connecting post is connected to the connecting hole.

4. The bimetallic tripping mechanism of the circuit breaker according to claim 3, characterized in that: The top of the connecting column has a limiting step, and the connecting groove is connected to the connecting column between the limiting step and the contact limiting column.

5. The bimetallic tripping mechanism of the circuit breaker according to claim 1, characterized in that: Both the connecting groove and the guide groove are racetrack-shaped structures.

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