Tripping mechanism of circuit breaker and circuit breaker

Abstract

The utility model provides a circuit breaker tripping mechanism and a circuit breaker, and the tripping mechanism comprises a pull rod which is movably disposed on a housing, and is provided with an initial position and a tripping position for driving a jump pin of an operation mechanism to unlock; the electric leakage tripper can be matched with the pull rod, and the electric leakage tripper is suitable for driving the pull rod to be switched from the initial position to the tripping position during electric leakage; and the bimetallic strip can be matched with the pull rod, and the bimetallic strip is suitable for driving the pull rod to be switched from the initial position to the tripping position during overload. Compared with the prior art in which an overload tripping mechanism and an electric leakage tripping mechanism realize tripping through respective pull rods, only one pull rod is needed, the structure is simpler, the assembly is faster and more convenient, and the production cost is reduced.

Description

Technical Field

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

[0002] A circuit breaker is a low-voltage protective device used in power distribution systems to connect or interrupt load lines. It has both a manual switch function and the ability to automatically perform overload, short circuit, and leakage protection.

[0003] Existing circuit breakers generally include an overload tripping mechanism and a leakage tripping mechanism. The overload tripping mechanism includes a bimetallic strip and a bimetallic pull rod. When an overload occurs, the bimetallic strip deforms and drives the tripping and locking of the operating mechanism through the bimetallic pull rod to unlock, thereby opening the circuit breaker. The leakage tripping mechanism includes a leakage tripper and a leakage pull rod driven by the leakage tripper. When a leakage fault occurs, the leakage tripper drives the tripping and locking of the operating mechanism through the leakage pull rod to unlock, thereby opening the circuit breaker. The structures of the above-mentioned overload tripping mechanism and leakage tripping mechanism are relatively complex and the production cost is high. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defects of the circuit breaker tripping mechanism in the prior art, such as complex structure and high production cost, so as to provide a circuit breaker tripping mechanism and a circuit breaker with simple structure and low production cost.

[0005] To this end, the utility model provides a tripping mechanism of a circuit breaker, comprising a pull rod, a leakage release and a bimetallic strip, wherein the pull rod is movably mounted on a housing, the pull rod having an initial position and a tripping position for driving an operating mechanism to trip and unlock; the leakage release can cooperate with the pull rod, and the leakage release is suitable for driving the pull rod to switch from the initial position to the tripping position when leakage occurs; the bimetallic strip can cooperate with the pull rod, and the bimetallic strip is suitable for driving the pull rod to switch from the initial position to the tripping position when overload occurs.

[0006] The pull rod has an abutment portion arranged in the middle thereof, and the abutment portion is driven by the bimetallic strip to drive the pull rod to move to the tripping position.

[0007] The pull rod has a first hook portion and a second hook portion respectively arranged at two ends thereof, the first hook portion cooperates with the residual current release device, and the second hook portion is suitable for driving the tripping and unlocking of the operating mechanism.

[0008] The leakage release includes a first coil, a first moving iron core and a first static iron core. When leakage occurs, the first coil will be energized, and the first moving iron core will move toward the first static iron core under the action of the magnetic field. The end of the first moving iron core away from the first static iron core is provided with a first hanging hole hooked and connected to the first hook.

[0009] The jump buckle is formed with a hook groove for the second hook portion to extend into.

[0010] The housing is formed with a second sliding groove for the pull rod to slide.

[0011] The tie rod is bent to form the abutment portion.

[0012] The utility model provides a circuit breaker, comprising the tripping mechanism of the circuit breaker as described above.

[0013] The technical solution of the utility model has the following advantages:

[0014] 1. The tripping mechanism of the circuit breaker provided by the utility model comprises a pull rod, a leakage release and a bimetallic strip. When a leakage fault occurs, the leakage release drives the pull rod to switch from an initial position to a tripping position; when an overload occurs, the bimetallic strip is deformed to drive the pull rod to switch from an initial position to a tripping position, that is, the leakage release and the bimetallic strip realize leakage and overload tripping through the same pull rod. Compared with the prior art in which the overload tripping mechanism and the leakage tripping mechanism realize tripping through their own pull rods respectively, only one pull rod is required, the structure is simpler, the assembly is faster and more convenient, and the production cost is reduced.

[0015] 2. In the tripping mechanism of the circuit breaker provided by the utility model, the pull rod has an abutment portion arranged in the middle thereof, and the abutment portion is driven by the bimetallic strip to drive the pull rod to move to the tripping position. The setting of the abutment portion has the advantage of simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0018] Figure 2 It is a schematic diagram of the structure of the tripping mechanism and operating mechanism of the circuit breaker;

[0019] Figure 3Another structural schematic diagram of the circuit breaker tripping mechanism and operating mechanism.

[0020] Explanation of the accompanying drawings: 1. Shell; 17. Jumper; 40. First coil; 45. First moving iron core; 46. First static iron core; 49. First hanging hole; 50. First hook; 56. Second hook; 58. Bimetallic strip; 62. Hook groove; 205. Pull rod; 206. Leakage release; 207. Second slide groove; 208. Abutment portion. DETAILED DESCRIPTION

[0021] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] Example

[0026] This embodiment provides a circuit breaker, including a housing 1 and a tripping mechanism disposed on the housing 1. Figure 1 As shown, the tripping mechanism includes a pull rod 205 , a residual current release 206 and a bimetallic strip 58 .

[0027] The bimetallic strip 58 can cooperate with the pull rod 205, and the bimetallic strip 58 is suitable for driving the pull rod 205 to switch from the initial position to the tripping position when overloaded.

[0028] The pull rod 205 is movably mounted on the housing 1, and the pull rod 205 has an initial position and a tripping position for unlocking the tripping button 17 of the driving operating mechanism, such as Figure 2 and Figure 3 As shown, the pull rod 205 has an abutment portion 208 arranged in the middle thereof, and a first hook portion 50 and a second hook portion 56 arranged at both ends thereof. The abutment portion 208 is driven by the bimetallic strip 58 to drive the pull rod 205 to move to the tripping position. The first hook portion 50 cooperates with the residual current release device 206, and the second hook portion 56 is suitable for driving the tripping buckle 17 of the operating mechanism to unlock. The tripping buckle 17 is formed with a hook groove 62 for the second hook portion 56 to extend into. In this embodiment, the housing 1 is formed with a second slide groove 207 for the pull rod 205 to slide. The pull rod 205 is formed by bending to form the abutment portion 208, the first hook portion 50 and the second hook portion 56, which saves materials and reduces production costs. It should be noted that the operating mechanism is an existing mature technology, so its specific structure and working principle are not described in detail.

[0029] The leakage release 206 can cooperate with the pull rod 205, and the leakage release 206 is suitable for driving the pull rod 205 to switch from the initial position to the tripping position when leakage occurs. The leakage release 206 includes a first coil 40, a first moving iron core 45 and a first static iron core 46. When leakage occurs, the first coil 40 will be energized, and the first moving iron core 45 will move toward the first static iron core 46 under the force of the magnetic field. The end of the first moving iron core 45 away from the first static iron core 46 is provided with a first hanging hole 49 hooked and connected to the first hook 50.

[0030] The tripping mechanism of the circuit breaker provided by the utility model comprises a pull rod 205, a leakage release 206 and a bimetallic strip 58. When a leakage fault occurs, the leakage release 206 drives the pull rod 205 to switch from an initial position to a tripping position; when an overload occurs, the bimetallic strip 58 is deformed to drive the pull rod 205 to switch from an initial position to a tripping position, that is, the leakage release 206 and the bimetallic strip 58 realize leakage and overload tripping through the same pull rod 205. Compared with the prior art in which the overload tripping mechanism and the leakage tripping mechanism realize tripping through their own pull rods respectively, only one pull rod is required, the structure is simpler, the assembly is faster and more convenient, and the production cost is reduced.

[0031] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A tripping mechanism of a circuit breaker, characterized in that: include: A pull rod (205) is movably mounted on the housing (1), wherein the pull rod (205) has an initial position and a tripping position for unlocking a tripping latch (17) of a driving operating mechanism; A leakage release (206) can cooperate with the pull rod (205), and the leakage release (206) is suitable for driving the pull rod (205) to switch from the initial position to the release position when leakage occurs; A bimetallic strip (58) can cooperate with the pull rod (205), and the bimetallic strip (58) is suitable for driving the pull rod (205) to switch from the initial position to the tripping position when overloaded.

2. The tripping mechanism of the circuit breaker according to claim 1, characterized in that: The pull rod (205) has an abutment portion (208) disposed in the middle thereof, and the abutment portion (208) is driven by the bimetallic strip (58) to drive the pull rod (205) to move to the tripping position.

3. The tripping mechanism of the circuit breaker according to claim 1 or 2, characterized in that: The pull rod (205) has a first hook portion (50) and a second hook portion (56) respectively arranged at two ends thereof, the first hook portion (50) cooperates with the residual current release (206), and the second hook portion (56) is suitable for driving a trip button (17) of the operating mechanism to unlock.

4. The tripping mechanism of the circuit breaker according to claim 3, characterized in that: The leakage release (206) comprises a first coil (40), a first moving iron core (45) and a first stationary iron core (46); when leakage occurs, the first coil (40) is energized, and the first moving iron core (45) moves towards the first stationary iron core (46) under the action of a magnetic field; the end of the first moving iron core (45) away from the first stationary iron core (46) is provided with a first hanging hole (49) for hooking with the first hook (50).

5. The tripping mechanism of the circuit breaker according to claim 3, characterized in that: The jump buckle (17) is formed with a hook groove (62) for the second hook portion (56) to extend into.

6. The tripping mechanism of the circuit breaker according to claim 1, characterized in that: The housing (1) is formed with a second sliding groove (207) for the pull rod (205) to slide.

7. The tripping mechanism of the circuit breaker according to claim 2, characterized in that: The pull rod (205) is bent to form the abutment portion (208).

8. A circuit breaker, characterized in that: The invention comprises a tripping mechanism of a circuit breaker according to any one of claims 1 to 7.

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