A small circuit breaker

Abstract

The utility model discloses a small circuit breaker, including a shell, a handle and a multi-link mechanism, a first locking wire terminal is fixedly installed on one side of the inner part of the shell, the first locking wire terminal is electrically connected to an electromagnetic trip assembly, the electromagnetic trip assembly is electrically connected to a static contact, the handle is connected to a moving contact through a multi-link mechanism, and the moving contact and the static contact are matched, the moving contact is electrically connected to a bimetallic strip through a copper wire, and the bimetallic strip is electrically connected to a second locking wire terminal. The utility model adopts the above structure: the first locking wire terminal, the coil, the static contact, the moving contact, the copper wire, the bimetallic strip, the conductive bracket and the second locking wire terminal are sequentially formed into a conductive path, the lock buckle and the trip buckle are matched to form a stable support structure, if the trip buckle is pressed by the electromagnetic trip assembly or the bimetallic strip, the lock buckle and the stable support structure are destroyed, and then the circuit is tripped, which can play a role in cutting off the circuit when the circuit is short-circuited or overloaded.

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] The use of circuit breakers can effectively improve the safety of electrical equipment. Circuit breakers are industrial power devices used to automatically cut off power lines when fault currents such as overload currents or short circuit currents occur in transmission lines / distribution lines with relatively low voltages.

[0003] With the increasing integration and miniaturization of electrical equipment, the requirements for miniaturization of circuit breakers are becoming higher and higher, and there are higher requirements for the layout optimization of circuit breakers. At present, traditional circuit breakers have many parts and the process is lengthy and complicated, which is not conducive to process optimization. The component structure is not streamlined enough and is prone to failure after repeated use, resulting in a short service life. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a small circuit breaker to solve the problem of being unfavorable to the optimization process.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A small circuit breaker comprises a shell, a handle and a multi-link mechanism, wherein a first locking wire terminal is fixedly installed on one side of an interior of the shell, the first locking wire terminal is electrically connected to an electromagnetic trip assembly, the electromagnetic trip assembly is electrically connected to a static contact, the handle is connected to a moving contact through the multi-link mechanism, and the moving contact corresponds to the static contact, the moving contact is electrically connected to a bimetallic strip through a copper wire, the bimetallic strip is electrically connected to a second locking wire terminal, a jumper is provided at the bottom of the moving contact, one end of the jumper corresponds to the electromagnetic trip assembly, and the other end of the jumper corresponds to the bimetallic strip.

[0007] Preferably, the electromagnetic release assembly includes an iron core body, a coil and a torsion spring, the coil is wrapped around the iron core body, one end of the coil is welded to the first locking wire terminal, the other end of the coil is connected to the static contact, and the torsion arm end of the torsion spring is movably connected to the iron core body.

[0008] Preferably, the multi-link mechanism includes a pull rod, a lock, a movable shaft, a fixed shaft and a tension spring, the handle is connected to the lock through the pull rod, the moving contact and the jumper are both rotatably connected in the shell through the fixed shaft, the lock is rotatably connected to the moving contact through the movable shaft, and the lock corresponds to the jumper, one end of the tension spring is fixedly mounted on the shell, and the other end of the tension spring is connected to the moving contact.

[0009] Preferably, an arc extinguishing grid is installed inside the housing, one end of the arc extinguishing grid is arranged on the side of the static contact, and a conductive bracket is arranged at the other end of the arc extinguishing grid, and the conductive bracket supports the bimetallic strip.

[0010] Preferably, the tripping member includes a rotating member, which rotates coaxially with the moving contact member, and the rotating member is integrally connected with a buckle, and a slot is provided on the buckle, and the side of the rotating member close to the electromagnetic trip assembly is integrally connected with a first trip arm, and the side of the rotating member close to the bimetallic strip is integrally connected with a second trip arm.

[0011] Preferably, a mounting member for mounting on a power distribution rack is mounted on the housing.

[0012] In summary, the beneficial effects of the utility model are:

[0013] First, a small circuit breaker provided by the utility model utilizes a first locking wire terminal, a coil, a static contact, a moving contact, a copper wire, a bimetallic strip, a conductive bracket and a second locking wire terminal to sequentially form a conductive path, and a lock buckle and a tripping piece cooperate to form a stable supporting structure. If the tripping piece is pressed by an electromagnetic tripping assembly or a bimetallic strip, the lock buckle and the stable supporting structure are damaged, and then the circuit breaker trips, which can cut off the circuit when the circuit is short-circuited or overloaded.

[0014] Second, the multi-link mechanism consists of a handle, a pull rod, a lock, a moving contact, and related connections and rotating shafts. It optimizes redundant transition parts and has faster and more sensitive movements. The lock is made of wear-resistant metal parts and the R-angle process is used at the jump buckle position. While the movement is reliable, the life of the mechanism is greatly improved.

[0015] Third, the electromagnetic release assembly utilizes the type of torsion spring, the number of coil turns and the different assembly positions of the torsion spring to meet the transient characteristics of various specifications. Compared with traditional products, the process is simpler, the number of parts is reduced, and the process consistency is better controlled.

[0016] Fourth, the conductive bracket can adjust the gap between the bimetallic strip and the tripping arm by adjusting the screw, which not only meets the function of adjusting the gap between the bimetallic strip and the tripping arm, but also has the function of driving the breaking arc to the arc extinguishing grid, thereby optimizing the structure and simplifying the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a basic structural schematic diagram of the utility model;

[0018] Figure 2 It is a schematic diagram of the structure of the jump fastener of the utility model.

[0019] Figure numerals: 1. housing; 2. handle; 3. multi-link mechanism; 301. pull rod; 302. lock; 303. movable shaft; 304. fixed shaft; 305. tension spring; 4. first lock wire terminal; 5. electromagnetic trip assembly; 501. core body; 502. coil; 503. torsion spring; 6. static contact; 7. moving contact; 8. bimetallic strip; 9. second lock wire terminal; 10. jumper; 1001. rotating part; 1002. buckle; 1003. slot; 1004. first trip arm; 1005. second trip arm; 11. arc extinguishing grid; 12. conductive bracket; 13. mounting part. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] like Figure 1 - Figure 2 As shown, a small circuit breaker provided by the utility model includes a shell 1, a handle 2 and a multi-link mechanism 3, a first lock wire terminal 4 is fixedly installed on one side of the inner part of the shell 1, the first lock wire terminal 4 is electrically connected to an electromagnetic trip assembly 5, the electromagnetic trip assembly 5 is electrically connected to a static contact 6, the handle 2 is connected to a moving contact 7 through the multi-link mechanism 3, and the moving contact 7 corresponds to the static contact 6, the moving contact 7 is electrically connected to a bimetallic strip 8 through a copper wire, the bimetallic strip 8 is electrically connected to a second lock wire terminal 9, a jumper 10 is provided at the bottom of the moving contact 7, one end of the jumper 10 corresponds to the electromagnetic trip assembly 5, and the other end of the jumper 10 corresponds to the bimetallic strip 8.

[0023] Among them, the outer shell 1 is used to accommodate internal parts, the first lock wire terminal 4 and the second lock wire terminal 9 are used for wiring, the electromagnetic release assembly 5 is an active component for instantaneous release, the static contact 6 is used for conduction, the moving contact 7 is used for conduction, protection and separation from the static contact 6 during opening, and the bimetallic strip 8 is used to heat up and bend during long-delay overload to drive the tripping component 10. The tripping component 10 is designed to be integrally formed, integrating instantaneous tripping, delayed tripping, and external active and passive tripping, and at the same time meets the mechanism parameters, which improves reliability while simplifying the process and optimizing the number of parts.

[0024] When the power is on normally, the bimetal strip 8 has no heat and does not bend; the magnetic force generated by the electromagnetic trip assembly 5 is very small, and neither can push the tripping part 10, and the power is continuously on, and the circuit breaker remains in the closed state. In the case of overload (long delay), when the overcurrent flows, the bimetal strip 8 heats up, bends, and displaces, pushing the tripping part, so that the tripping part is separated from the lock 302. Under the action of the spring and the pull rod 301, the moving and static contacts 6 separate and cut off the circuit. In the case of short circuit (instantaneous), when a large current such as a short circuit current flows, the electromagnetic trip assembly 5 generates a large magnetic force, and the core body 501 moves rapidly toward the tripping part 10, pushing the tripping part 10, so that the tripping part 10 is separated from the lock 302. Under the action of the spring and the pull rod 301, the moving and static contacts 6 separate and cut off the circuit.

[0025] The electromagnetic trip assembly 5 includes an iron core body 501, a coil 502 and a torsion spring 503, wherein the coil 502 is wound around the iron core body 501, one end of the coil 502 is welded to the first locking wire terminal 4, the other end of the coil 502 is connected to the static contact 6, and the torsion arm end of the torsion spring 503 is movably connected to the iron core body 501. The coil 502 is wound around the iron core body 501, wherein the coil 502 is conductive and can generate an electromagnetic field to make the iron core body 501 movable, and its function is that when a short circuit (instantaneous), the electromagnetic field generated by the coil 502 drives the tripping member 10 to separate from the lock 302 of the iron core body 501, thereby cutting off the circuit. Since the torque of the torsion spring 503 determines the instantaneous resistance of the iron core body 501, the type of torsion spring 503, the number of turns of the coil 502 and the different assembly positions of the torsion spring 503 are used to meet the instantaneous characteristics of various specifications, which is simpler than the traditional product process, reduces the number of parts, and has good control of process consistency.

[0026] The multi-link mechanism 3 includes a pull rod 301, a lock 302, a movable shaft 303, a fixed shaft 304 and a tension spring 305. The handle 2 is connected to the lock 302 through the pull rod 301. The moving contact 7 and the tripping catch 10 are both rotatably connected in the housing 1 through the fixed shaft 304. The lock 302 is rotatably connected to the moving contact 7 through the movable shaft 303, and the lock 302 is correspondingly matched with the tripping catch 10. One end of the tension spring 305 is fixedly mounted on the housing 1, and the other end of the tension spring 305 is connected to the moving contact 7. The pull rod 301 is used to connect the handle 2 and the lock 302. The lock 302 is locked with the tripping catch in normal operation. The movable shaft 303 is used to link the moving contact 7 and the lock 302. The fixed shaft 304 is used to position so that the moving contact 7 and the tripping catch can rotate. The tension spring 305 quickly resets the mechanism. The above components are used to form a multi-link structure. During normal operation, the handle 2 pushes the connecting rod to mainly connect the moving contact 7 with the static contact 6 for electrical conduction. At this time, the first lock wire terminal 4, the coil 502, the static contact 6, the moving contact 7, the copper wire, the bimetallic strip 8, the conductive bracket 12 and the second lock wire terminal 9 form a conductive path in sequence. The lock buckle 302 and the tripping buckle 10 are matched to form a stable support structure. If the tripping buckle 10 is pressed by the electromagnetic tripping assembly 5 or the bimetallic strip 8, the lock buckle 302 and the stable support structure are destroyed, and then the circuit breaker trips. The multi-link mechanism 3 composed of the handle 2, the pull rod 301, the lock buckle 302, the moving contact 7, etc. and the related connections and rotating shafts has a simplified structure while achieving the desired effect, optimizes redundant transition parts, and has a faster and more sensitive action speed. The lock buckle 302 is made of wear-resistant metal parts, and the R angle process is used at the position of the tripping buckle 1002. While the action is reliable, the life of the mechanism is greatly improved.

[0027] An arc extinguishing grid 11 is installed inside the housing 1, one end of the arc extinguishing grid 11 is arranged on the side of the static contact 6, and a conductive bracket 12 is arranged at the other end of the arc extinguishing grid 11, and the conductive bracket 12 supports the bimetallic strip 8. The conductive bracket 12 plays the role of conducting electricity and striking the arc. The bracket and the arc striking are designed as an integrated whole, and the conductive bracket 12 can adjust the gap between the bimetallic strip 8 and the tripping arm by adjusting the screw, which not only meets the function of adjusting the gap between the bimetallic strip 8 and the tripping buckle, but also has the function of driving the breaking arc to the arc extinguishing grid 11, simplifying the process.

[0028] The tripping member 10 includes a rotating member 1001, which rotates coaxially with the moving contact member. The rotating member 1001 is integrally connected with a buckle 1002, and a slot 1003 is provided on the buckle 1002. The side of the rotating member 1001 close to the electromagnetic tripping assembly 5 is integrally connected with a first tripping arm 1004, and the side of the rotating member 1001 close to the bimetallic strip 8 is integrally connected with a second tripping arm 1005. The rotating part 1001 of the tripping part 10 rotates coaxially with the moving contact, and the arranged slot 1003 corresponds to the lock buckle 302. The protruding part of the lock buckle 302 is stuck in the slot 1003 to form a stable supporting structure with the tripping part 10. The first tripping arm 1004 and the second tripping arm 1005 respectively trip according to the characteristics of the electromagnetic tripping assembly 5 and the bimetallic strip 8. When tripping, the first tripping arm 1004 and the second tripping arm 1005 are subjected to force to make the buckle 1002 swing, and then the lock buckle 302 is separated from the slot 1003, and the stable structure is destroyed. Under the action of the tension spring 305, the moving contact 7 is separated from the static contact 6. After the lock buckle 302 is loosened and vibrated, it will be stuck in the slot 1003 again, waiting for closing.

[0029] The housing 1 is provided with a mounting member 13 for mounting on a power distribution rack. The mounting member 13 is used for modular installation and disassembly.

[0030] Working principle: When the power is turned on normally, the bimetal strip 8 has no heat and does not bend; the magnetic force generated by the electromagnetic trip assembly 5 is very small, and neither can push the tripping part 10. The power is continuously turned on and the circuit breaker remains in the closed state. In case of overload (long delay), when the overcurrent flows, the bimetal strip 8 heats up, bends, and displaces, pushing the tripping part, so that the tripping part is separated from the lock 302. Under the action of the spring and the pull rod 301, the moving and static contacts 6 separate and cut off the circuit. In case of short circuit (instantaneous), when a large current such as a short circuit current flows, the electromagnetic trip assembly 5 generates a large magnetic force, and the core body 501 moves rapidly toward the tripping part 10, pushing the tripping part 10, so that the tripping part 10 is separated from the lock 302. Under the action of the spring and the pull rod 301, the moving and static contacts 6 separate and cut off the circuit.

[0031] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A miniature circuit breaker, comprising a housing (1), a handle (2) and a multi-link mechanism (3), characterized in that: A first locking wire terminal (4) is fixedly mounted on one side of the interior of the housing (1); the first locking wire terminal (4) is electrically connected to an electromagnetic trip assembly (5); the electromagnetic trip assembly (5) is electrically connected to a stationary contact (6); the handle (2) is connected to a moving contact (7) via a multi-link mechanism (3); the moving contact (7) and the stationary contact (6) are correspondingly matched; the moving contact (7) is electrically connected to a bimetallic strip (8) via a copper wire; the bimetallic strip (8) is electrically connected to a second locking wire terminal (9); a tripping member (10) is provided at the bottom of the moving contact (7); one end of the tripping member (10) is correspondingly matched to the electromagnetic trip assembly (5); and the other end of the tripping member (10) is correspondingly matched to the bimetallic strip (8).

2. A miniature circuit breaker according to claim 1, characterized in that: The electromagnetic trip assembly (5) comprises an iron core body (501), a coil (502) and a torsion spring (503); the coil (502) is wound around the iron core body (501); one end of the coil (502) is welded to a first locking wire terminal (4); the other end of the coil (502) is connected to a stationary contact (6); and the torsion arm end of the torsion spring (503) is movably connected to the iron core body (501).

3. A miniature circuit breaker according to claim 1, characterized in that: The multi-link mechanism (3) comprises a pull rod (301), a lock (302), a movable shaft (303), a fixed shaft (304) and a tension spring (305); the handle (2) is connected to the lock (302) via the pull rod (301); the moving contact (7) and the tripping member (10) are both rotationally connected in the housing (1) via the fixed shaft (304); the lock (302) is rotationally connected to the moving contact (7) via the movable shaft (303); the lock (302) and the tripping member (10) are correspondingly matched; one end of the tension spring (305) is fixedly mounted on the housing (1); and the other end of the tension spring (305) is connected to the moving contact (7).

4. A miniature circuit breaker according to claim 1, characterized in that: An arc extinguishing grid (11) is installed inside the housing (1), one end of the arc extinguishing grid (11) is arranged on the side of the stationary contact (6), and a conductive bracket (12) is arranged at the other end of the arc extinguishing grid (11), and the conductive bracket (12) supports the bimetallic strip (8).

5. A miniature circuit breaker according to claim 1, characterized in that: The tripping member (10) comprises a rotating member (1001), the rotating member (1001) rotates coaxially with the moving contact member, the rotating member (1001) is integrally connected to a buckle (1002), a slot (1003) is provided on the buckle (1002), a first tripping arm (1004) is integrally connected to a side of the rotating member (1001) close to the electromagnetic tripping assembly (5), and a second tripping arm (1005) is integrally connected to a side of the rotating member (1001) close to the bimetallic strip (8).

6. A miniature circuit breaker according to claim 1, characterized in that: The housing (1) is provided with a mounting member (13) for mounting on a power distribution rack.

Images