Tripping mechanism for residual-current circuit breaker

Abstract

The utility model belongs to the field of residual-current circuit breakers, and particularly relates to a tripping mechanism for a residual-current circuit breaker, which comprises a residual-current circuit breaker shell, a tripping assembly is arranged in the residual-current circuit breaker shell, and a tripper and a moving contact are respectively arranged in the residual-current circuit breaker shell. A driving part is rotatably connected between the release and the moving contact in the residual-current circuit breaker shell, and the driving part is designed in the residual-current circuit breaker shell and used for being matched with the moving contact and the release, so that during closing, the moving contact can drive the driving part to rotate in the resetting process, and the driving part can drive the driving part to rotate in the resetting process. Compared with a complex reset structure in the prior art, the reset structure has the advantages that the composition parts of the reset structure are greatly simplified, the use number of precise elements is reduced, the manufacturing cost is reduced, and transmission links and friction points are reduced, so that the reset failure risk caused by abrasion or looseness of the parts is reduced.

Description

Technical Field

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

[0002] As a key device for ensuring electrical safety in power systems, the core function of a leakage circuit breaker is to rapidly disconnect the circuit upon detecting a leakage current, preventing electric shock accidents and electrical fires. This function is primarily achieved through a tripping mechanism. When an abnormal current is detected, the tripping mechanism triggers a tripping operation, disconnecting the circuit breaker. However, after completing the tripping operation, the circuit breaker must be able to reliably reset to prepare for the next closing operation. The performance and efficiency of the reset mechanism during this process directly impact the overall performance and cost of the circuit breaker.

[0003] The reset structure of the tripping mechanism of the leakage circuit breaker in the prior art is often designed to be relatively complex, usually including multiple precision components and complex transmission mechanisms to achieve the reset of the tripper pin. Specifically, the existing reset structure generally involves the precise matching of components such as connecting rods, springs and driving parts. These components are prone to wear or failure during long-term use, affecting the accuracy and reliability of the reset action. At the same time, the complex structure also increases the production cost and weight of the product, which is not conducive to the compact design and installation convenience of the equipment. Therefore, in response to the above situation, a tripping mechanism for a leakage circuit breaker is proposed. Utility Model Content

[0004] In order to overcome the problem that the reset structure of the existing leakage circuit breaker tripping mechanism is often designed to be complex and inconvenient to use, the utility model provides a tripping mechanism for the leakage circuit breaker.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a tripping mechanism for a leakage circuit breaker, comprising a leakage circuit breaker housing, a tripping assembly being arranged inside the leakage circuit breaker housing, a tripping device and a moving contact cooperating with the tripping assembly being respectively arranged inside the leakage circuit breaker housing, and a driving member being rotatably connected between the tripping device and the moving contact inside the leakage circuit breaker housing.

[0006] The driving member includes a longitudinal rod, a rotating plate is fixedly connected to the middle of the longitudinal rod, one end of the longitudinal rod is fixedly connected to the first bending rod, the end of the longitudinal rod away from the first bending rod is fixedly connected to the transverse rod, the end of the transverse rod away from the longitudinal rod is fixedly connected to the second bending rod, the middle of the transverse rod is fixedly connected to a limiting rod, the limiting rod and the second bending rod together form a limiting channel, and the moving contact cooperates with the limiting channel at the end away from the tripping assembly.

[0007] Preferably, a fixing column is fixedly connected to the interior of the leakage circuit breaker housing, and the fixing column is rotatably engaged with the rotating plate.

[0008] Preferably, the rotating plate is semicircular in shape, and an assembly hole is formed through the rotating plate, and the assembly hole is loosely matched with the fixing column.

[0009] Preferably, the trip assembly includes a trip buckle, and the trip buckle is matched with a lock buckle at one end away from the tripper.

[0010] Preferably, the releaser is provided with a first push rod and a second push rod, the second push rod is used to cooperate with the lock, and the first push rod is used to cooperate with the first bending rod.

[0011] Preferably, the first bending rod and the second bending rod are both in an "L" shape.

[0012] Preferably, the longitudinal rod, the rotating plate, the first bending rod, the transverse rod, the second bending rod and the limiting rod are integrally formed.

[0013] Preferably, the driving member is arranged at the bottom of the trip assembly.

[0014] The utility model is beneficial in that:

[0015] 1. The utility model designs a driving member inside the leakage circuit breaker housing to cooperate with the moving contact and the release. When the circuit breaker is opened, the first and second push rods on the release are pushed out, and then the lock is pushed to rotate by the second push rod to complete the tripping process. When the circuit breaker is closed, the moving contact will drive the driving member to rotate during the resetting process, and the rotation of the driving member can realize the resetting process of the second push rod. Compared with the complex reset structure in the prior art, the reset structure is greatly simplified, the number of precision components used is reduced, the manufacturing cost is reduced, the transmission links and friction points are reduced, and the risk of reset failure caused by component wear or loosening is reduced. At the same time, the direct transmission method between the moving contact and the driving member ensures the accuracy and consistency of the reset action, and improves the overall stability and reliability of the circuit breaker.

[0016] 2. The present invention simplifies the reset structure, making the entire tripping mechanism more compact and reducing the occupied space, which is conducive to the miniaturization and integrated design of the circuit breaker, and also reduces the complexity of installation and maintenance, thereby improving the usability and maintainability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 Schematic diagram of the internal structure of the leakage circuit breaker housing;

[0019] Figure 2 It is a structural diagram of the trip unit;

[0020] Figure 3 Schematic diagram of the matching structure of the driving member and the moving contact;

[0021] Figure 4 Schematic diagram of the structure of the driving component.

[0022] In the figure: 1. Leakage circuit breaker housing; 2. Trip assembly; 201. Trip latch; 202. Lock; 3. Trip unit; 301. First push rod; 302. Second push rod; 4. Driving member; 401. Longitudinal rod; 402. Rotating plate; 403. Assembly hole; 404. First bending rod; 405. Transverse rod; 406. Second bending rod; 407. Limit rod; 408. Limit channel; 5. Moving contact. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] The following is combined with Figure 1 —4 further details of this application,

[0025] The embodiment of the present application discloses a tripping mechanism for a leakage circuit breaker. Figure 1 、 Figure 2 、 Figure 3 and Figure 4 A tripping mechanism for a leakage circuit breaker includes a leakage circuit breaker housing 1, a tripping assembly 2 is provided inside the leakage circuit breaker housing 1, and a tripping device 3 and a moving contact 5 that cooperate with the tripping assembly 2 are also provided inside the leakage circuit breaker housing 1. A driving member 4 is rotatably connected between the tripping device 3 and the moving contact 5 inside the leakage circuit breaker housing 1, and the driving member 4 is provided at the bottom of the tripping assembly 2.

[0026] The driving member 4 includes a longitudinal rod 401, a rotating plate 402 is fixedly connected to the middle of the longitudinal rod 401, one end of the longitudinal rod 401 is fixedly connected to the first bending rod 404, the end of the longitudinal rod 401 away from the first bending rod 404 is fixedly connected to the transverse rod 405, the end of the transverse rod 405 away from the longitudinal rod 401 is fixedly connected to the second bending rod 406, the middle of the transverse rod 405 is fixedly connected to the limiting rod 407, the limiting rod 407 and the second bending rod 406 together form a limiting channel 408, and the moving contact 5 cooperates with the limiting channel 408 at the end away from the trip assembly 2.

[0027] Reference Figure 1 and Figure 4 A fixing column is fixedly connected to the interior of the leakage circuit breaker housing 1, and the rotating plate 402 is a semicircular plate structure. An assembly hole 403 is opened through the rotating plate 402, and the assembly hole 403 is clearance-matched with the fixing column.

[0028] By providing the assembly hole 403 and the clearance fit with the fixed column, the rotating plate 402 can complete the rotation operation when resetting, thereby enabling the first bending rod 404 to complete the return of the push rod.

[0029] Reference Figure 1 and Figure 3 The trip assembly 2 includes a trip buckle 201 , and the trip buckle 201 is equipped with a lock buckle 202 at one end away from the tripper 3 .

[0030] Furthermore, the trip assembly 2 is a part of the circuit breaker trip mechanism, which also includes a trip rod, a trip spring, a locking mechanism and other structures. The trip mechanism is a prior art, and its specific connection relationship will not be described in detail here.

[0031] Reference Figure 3 and Figure 4 The releaser 3 is provided with a first push rod 301 and a second push rod 302 . The second push rod 302 is used to cooperate with the lock buckle 202 , and the first push rod 301 is used to cooperate with the first bending rod 404 .

[0032] By setting the first bending rod 404 to push back the first push rod 301, the second push rod 302 is retracted synchronously. After the second push rod 302 reaches the top, it can push the lock 202 to rotate, thereby completing the tripping process of the tripping mechanism and achieving the purpose of opening the switch.

[0033] Furthermore, after the switch is opened, after the moving contact 5 drives the rotating plate 402 to rotate, there is still a certain gap between the first push rod 301 and the first bending rod 404 to avoid interference with the switch opening. After the switch is closed, there is a certain gap between the second push rod 302 and the lock buckle 202.

[0034] Furthermore, the first push rod 301 and the second push rod 302 work synchronously.

[0035] Reference Figure 3 and Figure 4 The first bending rod 404 and the second bending rod 406 are both in an “L” shape.

[0036] The first bending rod 404 is designed to be L-shaped to push back the first push rod 301 , and the second bending rod 406 is designed to be L-shaped to cooperate with the limiting rod 407 to limit the moving contact 5 .

[0037] Reference Figure 4 The longitudinal rod 401, the rotating plate 402, the first bending rod 404, the transverse rod 405, the second bending rod 406 and the limiting rod 407 are integrally formed.

[0038] Furthermore, the longitudinal rod 401 , the rotating plate 402 , the first bending rod 404 , the transverse rod 405 , the second bending rod 406 and the limiting rod 407 are all made of stainless steel.

[0039] Working principle: When opening, the first push rod 301 and the second push rod 302 on the tripper 3 are pushed out, and then the lock catch 202 is pushed to rotate to complete the tripping process through the second push rod 302. When closing, during the resetting process of the moving contact 5, since one end of the moving contact 5 is located in the limit channel 408, the movement of the moving contact 5 will conflict with the second bent rod 406. As the moving contact 5 continues to move, the second bent rod 406 will drive the longitudinal rod 401 to rotate, thereby causing the first bent rod 404 to rotate and conflict with the first push rod 301 and push the first push rod 301 back into the tripper 2, and the second push rod 302 is retracted synchronously. Compared with the complex reset structure in the prior art, the components of the reset structure are greatly simplified, the number of precision components used is reduced, the manufacturing cost is reduced, the transmission links and friction points are reduced, and the risk of reset failure caused by component wear or loosening is reduced. At the same time, the direct transmission method between the moving contact 5 and the drive member 4 ensures the accuracy and consistency of the reset action, thereby improving the overall stability and reliability of the circuit breaker.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention as claimed.

Claims

1. A tripping mechanism for a leakage circuit breaker, comprising a leakage circuit breaker housing (1), a tripping assembly (2) being provided inside the leakage circuit breaker housing (1), and a tripper (3) and a moving contact (5) respectively cooperating with the tripping assembly (2) being provided inside the leakage circuit breaker housing (1), characterized in that: A driving member (4) is rotatably connected inside the leakage circuit breaker housing (1) between the trip unit (3) and the moving contact (5); The driving member (4) comprises a longitudinal rod (401), a rotating plate (402) is fixedly connected to the middle of the longitudinal rod (401), one end of the longitudinal rod (401) is fixedly connected to a first bending rod (404), an end of the longitudinal rod (401) away from the first bending rod (404) is fixedly connected to a transverse rod (405), an end of the transverse rod (405) away from the longitudinal rod (401) is fixedly connected to a second bending rod (406), a limiting rod (407) is fixedly connected to the middle of the transverse rod (405), the limiting rod (407) and the second bending rod (406) together form a limiting channel (408), and the moving contact (5) cooperates with the limiting channel (408) at the end away from the trip assembly (2).

2. A tripping mechanism for a leakage circuit breaker according to claim 1, characterized in that: A fixing column is fixedly connected to the interior of the leakage circuit breaker housing (1), and the fixing column is rotationally engaged with the rotating plate (402).

3. A tripping mechanism for a leakage circuit breaker according to claim 2, characterized in that: The rotating plate (402) is semicircular in shape, and an assembly hole (403) is provided through the rotating plate (402), and the assembly hole (403) is clearance-matched with the fixing column.

4. The tripping mechanism for a leakage circuit breaker according to claim 1, characterized in that: The trip assembly (2) comprises a trip buckle (201), and the trip buckle (201) is matched with a lock buckle (202) at one end away from the tripper (3).

5. The tripping mechanism for a leakage circuit breaker according to claim 1, characterized in that: The releaser (3) is provided with a first push rod (301) and a second push rod (302), the second push rod (302) is used to cooperate with the lock buckle (202), and the first push rod (301) is used to cooperate with the first bending rod (404).

6. The tripping mechanism for a leakage circuit breaker according to claim 1, characterized in that: The first bending rod (404) and the second bending rod (406) are both "L" shaped.

7. The tripping mechanism for a leakage circuit breaker according to claim 1, characterized in that: The longitudinal rod (401), the rotating plate (402), the first bending rod (404), the transverse rod (405), the second bending rod (406) and the limiting rod (407) are integrally formed.

8. The tripping mechanism for a leakage circuit breaker according to claim 1, characterized in that: The driving member (4) is arranged at the bottom of the tripping assembly (2).

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