Miniature circuit breaker

Abstract

The utility model relates to a miniature circuit breaker, which comprises a base, a handle and an operating mechanism, the handle and the operating mechanism are arranged in the base, the operating mechanism comprises a contact seat, a lock catch, a flying wire, a moving contact rod, a static contact rod and a contact torsion spring, a flash barrier is further formed in the base, the flash barrier is arranged between the contact seat and the handle, a spring cavity is formed on one side of the flash barrier corresponding to the contact seat, and the contact torsion spring is arranged in the spring cavity. A spring shaft is arranged in the contact seat corresponding to the spring cavity, a counter-force spring is arranged on the spring shaft, one end of the counter-force spring abuts against the spring shaft, and the other end of the counter-force spring abuts against the spring cavity. By means of the design of the flash barrier, electric arc can be effectively limited in a small space and prevented from diffusing to a handle area, so that safety of equipment and operators is protected, the spring cavity limits the moving range of the counter-force spring in the working process, and the safety of the counter-force spring is improved. The spring can be kept on a preset path when being stressed or released, the overall reliability of equipment is improved, and the service life of the equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a small circuit breaker. Background Art

[0002] Miniature circuit breakers are an important part of the power system, used to quickly cut off the current when an abnormality occurs in the circuit, thereby protecting the safety of the circuit and equipment. In the structure of the circuit breaker, the arc isolation plate plays a vital role. However, in some designs of miniature circuit breakers, there is a problem of no arc isolation plate. Without the arc isolation plate, when the circuit breaker generates an arc during operation, the arc may directly impact the handle, causing damage to the handle, which not only affects the appearance of the circuit breaker, but also may reduce its service life. In addition, damage to the handle may also affect the safety of the operator, because during operation, the operator needs to directly touch the handle. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a small circuit breaker with long service life and strong safety performance.

[0004] In order to achieve the above purpose, the utility model adopts such a small circuit breaker, including a base and a handle and an operating mechanism arranged in the base, the operating mechanism includes a contact seat, a lock, a flying wire, a moving contact rod, a static contact rod, and a contact torsion spring. An arc isolation plate is also formed in the base, and the arc isolation plate is arranged between the contact seat and the handle to isolate the arc. The arc isolation plate forms a spring cavity on one side corresponding to the contact seat, and a spring shaft is arranged in the spring cavity corresponding to the contact seat, and a reaction spring is arranged on the spring shaft, and one end of the reaction spring abuts on the spring shaft, and the other end abuts on the spring cavity.

[0005] The beneficial effects of the above structure are: the design of the arc isolation plate can effectively confine the arc to a smaller space, preventing it from spreading to the handle area, thereby protecting the safety of the equipment and operators; the spring cavity limits the movement range of the reaction spring during operation, ensuring that the spring can remain on a predetermined path when under pressure or released, thereby improving the overall reliability and service life of the equipment.

[0006] The utility model is further configured to form a first pin shaft on the base, on which a contact seat, a lock buckle and a flying wire are sequentially sleeved, the handle shaft is connected to the base, a connecting rod is connected between the contact seat and the handle, the contact seat is further provided with a second pin shaft on the side away from the first pin shaft, a moving contact rod and a contact torsion spring are sequentially sleeved on the second pin shaft, a static contact rod is provided on one side of the moving contact rod, a static contact is provided on the static contact rod, and a moving contact facing the static contact is provided on the moving contact rod. The working principle of the utility model is as follows: when no operation is performed, the moving contact and the static contact are in a separated state and the circuit is disconnected. When the user operates the handle, the contact seat is driven to move through the connecting rod, and the contact seat slides along the first pin shaft, while driving the lock buckle and the flying wire to move. As the contact seat moves, the moving contact rod slides on the second pin shaft together with the moving contact, gradually approaching the static contact. When the moving contact contacts the static contact, a circuit path is formed and current begins to flow. During the contact between the moving contact and the static contact, the reaction spring begins to compress, providing a reaction force for the contact seat. The lock buckle is used to lock the position of the contact seat, thereby maintaining the contact state between the moving contact and the static contact, so that the circuit remains open. When reset, the contact torsion spring is used to reset the moving contact rod, driving the moving contact rod back to the initial position and separating it from the static contact. At the same time, the reaction spring also releases its compression force to push the contact seat back to the initial position. The arc isolation plate is used to isolate the arc during the switch operation to ensure the safety of the switch operation. The above technical solution integrates multiple components on the base and uses the first pin and the second pin for sleeve and connection, so that the entire structure becomes compact and orderly, which not only saves space but also helps to improve the overall stability and reliability of the equipment. The setting of the moving contact toward the static contact enables the two to form a good electrical connection when they are in contact.

[0007] The utility model is further configured such that the moving contact rod includes a sleeve portion sleeved on the second pin shaft, a first conductive portion arranged at the lower end of the sleeve portion, the moving contact is arranged at the end of the first conductive portion, the stationary contact rod includes a clamping portion clamped on the base, a second conductive portion arranged at the lower end of the clamping portion, and the stationary contact is arranged at the end of the second conductive portion. The above technical solution simplifies the assembly process and improves production efficiency by fixing the moving contact rod and the stationary contact rod to the second pin shaft and the base by sleeve and clamping, respectively. The moving contact and the stationary contact are respectively arranged at the ends of the first conductive portion and the second conductive portion. Such a design makes the contact area larger and the contact more stable.

[0008] The utility model is further configured that the contact torsion spring includes a main body portion sleeved on the second pin shaft and a pressing portion pressing the movable contact rod on the contact seat. The above technical solution enables the contact torsion spring to be firmly sleeved on the second pin shaft through the design of the contact torsion spring, thereby ensuring its stability during use and preventing it from loosening or falling off. The pressing portion of the contact torsion spring can effectively press the movable contact rod on the contact seat, ensuring close contact between the contact and the contact seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the internal structure of an embodiment of the utility model.

[0010] Figure 2 It is a three-dimensional schematic diagram of a base and a contact seat according to an embodiment of the utility model.

[0011] Figure 3 It is a three-dimensional diagram of the internal structure of an embodiment of the utility model.

[0012] Figure 4 It is a three-dimensional assembly diagram of the contact seat, the movable contact rod and the contact torsion spring of the embodiment of the utility model.

[0013] Figure 5 It is a three-dimensional schematic diagram of a base, a contact seat and a moving and stationary contact rod according to an embodiment of the utility model. DETAILED DESCRIPTION

[0014] like Figure 1-Figure 5 As shown, an embodiment of the utility model provides a small circuit breaker, including a base 1 and a handle 2 and an operating mechanism 3 arranged in the base 1, the operating mechanism 3 includes a contact seat 31, a lock 32, a flying wire 33, a moving contact rod 34, a static contact rod 35, and a contact torsion spring 36. An arc isolation plate 4 is also formed in the base 1, and the arc isolation plate 4 is arranged between the contact seat 31 and the handle 2 for isolating the arc. The arc isolation plate 4 is formed with a spring cavity 41 on one side corresponding to the contact seat 31, and a spring shaft 311 is arranged in the spring cavity 41 corresponding to the contact seat 31, and a reaction spring 312 is arranged on the spring shaft 311, and one end of the reaction spring 312 abuts on the spring shaft 311, and the other end abuts on the spring cavity 41. A first pin shaft 11 is formed on the base 1, and the contact seat 31, the lock 32 and the flying wire 33 are sequentially sleeved on the first pin shaft 11. The handle 2 is axially connected to the base 1, and a spring is connected between the contact seat 31 and the handle 2. The connecting rod 21 and the contact seat 31 are further provided with a second pin shaft 313 on the side away from the first pin shaft 11, and the second pin shaft 313 is sleeved with a moving contact rod 34 and a contact torsion spring 36 in sequence, and a stationary contact rod 35 is provided on one side of the moving contact rod 34, and a stationary contact 353 is provided on the stationary contact rod 35, and a moving contact 343 facing the stationary contact 351 is provided on the moving contact rod 34, and the moving contact rod 34 includes a sleeve portion 341 sleeved on the second pin shaft 313, and a sleeve portion 343 provided on the sleeve portion 343. 41, the moving contact 343 is arranged at the end of the first conductive part 342, the static contact rod 35 includes a clamping part 351 clamped on the base 1, and a second conductive part 352 arranged at the lower end of the clamping part 351, the static contact 353 is arranged at the end of the second conductive part 352, and the contact torsion spring 36 includes a main body part 361 sleeved on the second pin shaft 313 and a pressing part 362 that presses the moving contact rod 34 on the contact seat 31.

[0015] Of course, in addition to the above-mentioned embodiments, the utility model may also have many other embodiments. Without departing from the essential technical solution content of the utility model, technical personnel familiar with the field may make various corresponding changes and deformations according to the utility model, and these changes or deformations are equivalent to the technical solution in this patent. Then these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the utility model, and the utility model creation is in line with the applicant's actual R&D capabilities and resource conditions.

Claims

1. A miniature circuit breaker, comprising a base, a handle and an operating mechanism arranged in the base, wherein the operating mechanism comprises a contact seat, a lock, a flying wire, a moving contact rod, a stationary contact rod, and a contact torsion spring, characterized in that: An arc isolation plate is also formed in the base. The arc isolation plate is arranged between the contact seat and the handle for isolating the arc. The arc isolation plate forms a spring cavity on one side corresponding to the contact seat. A spring shaft is arranged in the spring cavity corresponding to the contact seat. A reaction force spring is arranged on the spring shaft. One end of the reaction force spring abuts against the spring shaft, and the other end abuts against the spring cavity.

2. The miniature circuit breaker according to claim 1, characterized in that: A first pin is formed on the base, on which a contact seat, a lock and a flying wire are sequentially sleeved, the handle shaft is connected to the base, a connecting rod is connected between the contact seat and the handle, the contact seat is further provided with a second pin on a side away from the first pin, a moving contact rod and a contact torsion spring are sequentially sleeved on the second pin, a static contact rod is provided on one side of the moving contact rod, a static contact is provided on the static contact rod, and a moving contact facing the static contact is provided on the moving contact rod.

3. The miniature circuit breaker according to claim 2, characterized in that: The moving contact rod includes a sleeve portion sleeved on the second pin shaft, a first conductive portion arranged at the lower end of the sleeve portion, and the moving contact is arranged at the end of the first conductive portion. The stationary contact rod includes a clamping portion clamped on the base, a second conductive portion arranged at the lower end of the clamping portion, and the stationary contact is arranged at the end of the second conductive portion.

4. The miniature circuit breaker according to claim 2 or 3, characterized in that: The contact torsion spring comprises a main body portion sleeved on the second pin shaft and a pressing portion pressing the movable contact rod on the contact seat.

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