A trip unit for a circuit breaker and a circuit breaker

Abstract

The application discloses a circuit breaker's tripping assembly and circuit breaker, comprising a contact unit, a side plate, a linkage, a tripping device and an upper cover, the side plate is installed in the upper cover, the tripping device and the linkage are installed on the same side of the side plate in transverse arrangement, the tripping device has a push rod, the contact unit is below the linkage, a first surrounding wall is arranged on the side plate corresponding to the periphery of the tripping device, the upper cover is provided with a second surrounding wall corresponding to the first surrounding wall and spliced and matched with the first surrounding wall, a slot hole is formed between the first surrounding wall and the second surrounding wall corresponding to the push rod of the tripping device, the linkage is movably arranged on the side plate, the linkage has a driving part matched with the push rod of the tripping device, the driving part is always matched with the slot hole in the movable stroke, so that the driving part of the linkage, the first surrounding wall and the second surrounding wall form a closed isolation structure, thereby preventing the arc and gas generated by the contact unit breaking from entering the tripping device, prolonging the service life and ensuring the working stability.

Description

Technical Field

[0001] This invention relates to the field of tripping assembly technology, and more specifically to a tripping assembly and circuit breaker for a circuit breaker. Background Technology

[0002] Existing circuit breakers, such as the circuit breaker tripping mechanism and circuit breaker disclosed in Chinese Patent Publication No. CN115513014A, have their tripping device, linkage, and contact unit arranged vertically. The push rod of the tripping device is located on the bottom side of the tripping device, and the downward movement of the push rod pushes the linkage to rotate and open the circuit. This arrangement results in a close distance between the tripping device and the contact unit, and no isolation structure is formed between the two. However, the tripping device of an electromagnetic residual current operated circuit breaker has very high sensitivity, and changes in the surface quality of its armature and yoke have a significant impact on the residual operating current of the product. Furthermore, the electric arc and gas generated by the contact unit of the existing circuit breaker during disconnection can easily enter the tripping device from the top, making it easy for foreign objects to adhere to the surface of the armature and yoke of the tripping device, affecting the contact air gap of the armature and yoke, and affecting the service life and operational stability. Summary of the Invention

[0003] The present invention aims to provide a tripping assembly for a circuit breaker to solve the aforementioned technical problems.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: a tripping assembly for a circuit breaker, comprising a contact unit, a side plate, a linkage, a trip unit, and a top cover. The side plate is installed inside the top cover. The trip unit and the linkage are arranged laterally on the same side of the side plate. The trip unit has a push rod. The contact unit is located below the linkage. A first enclosure is provided on the side plate corresponding to the periphery of the trip unit. A second enclosure is provided on the top cover corresponding to the periphery of the trip unit and splicing with the first enclosure. A slot is formed between the first enclosure and the second enclosure at the push rod of the trip unit. The linkage is movably mounted on the side plate. The linkage has a driving part that cooperates with the push rod of the trip unit. The driving part is always in a blocking engagement with the slot during its active stroke, so that the driving part of the linkage, the first enclosure, and the second enclosure cooperate to form a closed isolation structure, thereby preventing the arc and gas generated by the breakage of the contact unit from entering the trip unit.

[0005] Preferably, the trip unit is covered with a shielding cover, which has a through hole for the push rod to make way, and the through hole is located on the side of the shielding cover closer to the isolation structure.

[0006] Preferably, the first enclosure includes a first rear enclosure and a bottom enclosure respectively corresponding to the rear side and bottom side of the trip unit, and the second enclosure includes a second rear enclosure and a right enclosure respectively corresponding to the rear side and right side of the trip unit. The first rear enclosure and the second rear enclosure are spliced ​​together, and the bottom enclosure and the right enclosure are spliced ​​together. A slot is formed between the first rear enclosure and the second rear enclosure, and the push rod of the trip unit and the driving part of the linkage are located on the front and rear sides of the slot respectively.

[0007] Preferably, the linkage is rotatably mounted on the side plate. The upper and lower sides of the first rear wall corresponding to the slot are respectively formed with an upper arc surface and a lower arc surface. The driving part includes a driving plate corresponding to the slot and an upper arc plate and a lower arc plate respectively provided on the upper and lower sides of the driving plate. The arc centers of the upper arc plate, the upper arc surface, the lower arc plate, and the lower arc surface are all located on the rotating shaft of the linkage. The upper arc plate is always in clearance fit with the upper arc surface during its active stroke to prevent electric arc and gas from entering the slot from the upper side. The lower arc plate is always in clearance fit with the lower arc surface during its active stroke to prevent electric arc and gas from entering the slot from the lower side.

[0008] Preferably, an upper serrated groove is provided on the arc surface of the upper arc plate on the side closest to the upper arc surface, and the shape of the upper serrated groove is a right triangle with the right angle side located on the bottom side.

[0009] Preferably, a lower serrated groove is provided on the arc surface of the lower arc plate on the side close to the lower arc surface, and the shape of the lower serrated groove is a right triangle with the right angle side located on the top side.

[0010] Preferably, the first rear wall has a left side facade corresponding to the left side of the slot, and the second rear wall has a right side facade corresponding to the right side of the slot. The left side of the drive unit is always in clearance fit with the left side facade during its active stroke to prevent electric arc and gas from entering the slot from the left side, and the right side of the drive unit is always in clearance fit with the right side facade during its active stroke to prevent electric arc and gas from entering the slot from the right side.

[0011] Preferably, it also includes a tripping mechanism installed on the side of the side plate opposite to the linkage member. The linkage member is provided with a pushing part, which is driven by the tripping mechanism and the contact unit. An elastic member is provided on the side plate between the linkage member and the contact unit to provide elastic force for the linkage member to rotate and reset.

[0012] Preferably, the contact unit includes a moving contact shaft, a moving contact, and a stationary contact. The moving contact is mounted on the moving contact shaft and is in contact with or disconnected from the stationary contact. The tripping mechanism includes a locking buckle, a re-locking buckle, and a tripping buckle that are driven in sequence. A movable hole is provided on the side plate. One end of the locking buckle passes through the movable hole and is driven in conjunction with the pushing part. The tripping buckle is driven in conjunction with the moving contact shaft.

[0013] Preferably, it also includes a circuit board soldered onto the trip unit.

[0014] The present invention also provides a circuit breaker, including the tripping assembly and operating mechanism of any of the circuit breakers described above.

[0015] The present invention has the following beneficial effects:

[0016] (1) By arranging the trip unit and the linkage component laterally on the same side of the side plate, and placing the contact unit below the linkage component, the driving part of the linkage component is always engaged with the slot sealing part during its active stroke, so that the driving part of the linkage component, the first enclosure wall, and the second enclosure wall cooperate with each other to form a closed isolation structure. This structural layout results in a greater distance between the trip unit and the contact unit, and the trip unit is offset to one side directly above the contact unit. The isolation structure separates the trip unit from the contact unit, so that the electric arc and gas generated when the contact unit breaks will not enter the trip unit, thereby preventing foreign objects from adhering to the surface of the armature and yoke of the trip unit, affecting the contact air gap of the armature and yoke, extending the service life of the product, and ensuring operational stability.

[0017] (2) By forming an upper arc-shaped surface and a lower arc-shaped surface on the upper and lower sides of the slot corresponding to the first rear enclosure, the driving part includes a driving plate corresponding to the slot and an upper arc-shaped plate and a lower arc-shaped plate respectively provided on the upper and lower sides of the driving plate. The upper arc-shaped plate is always in clearance fit with the upper arc-shaped surface (the gap is very small and uniformly unchanged) during its active stroke to prevent electric arc and gas from entering the slot from the upper side. The lower arc-shaped plate is always in clearance fit with the lower arc-shaped surface (the gap is very small and uniformly unchanged) during its active stroke to prevent electric arc and gas from entering the slot from the lower side, thereby further improving the protective effect of the trip device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the appearance of a circuit breaker according to an embodiment of the present invention.

[0019] Figure 2 yes Figure 1 Sectional view at point A in the middle.

[0020] Figure 3 This is a right view of the tripping assembly of the circuit breaker according to an embodiment of the present invention after the top cover has been removed.

[0021] Figure 4 This is a perspective view of the tripping assembly of the circuit breaker according to an embodiment of the present invention after the top cover has been removed.

[0022] Figure 5 This is a schematic diagram of the internal structure of the tripping assembly of the circuit breaker according to an embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the structure of the upper cover of the circuit breaker according to an embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the splicing of the first rear enclosure wall and the second rear enclosure wall in an embodiment of the present invention.

[0025] Figure labels: 1 Contact unit, 1.1 Moving contact shaft, 1.2 Moving contact, 1.3 Stationary contact, 2 Side plate, 2.1 First rear enclosure wall, 2.11 Upper arc surface, 2.12 Lower arc surface, 2.13 Left side elevation, 2.2 Bottom enclosure wall, 3 Linkage component, 3.1 Drive unit, 3.11 Drive plate, 3.12 Upper arc plate, 3.13 Lower arc plate, 3.14 Upper serrated groove, 3.15 Lower serrated groove, 3.2 Pushing unit, 4 Tripping device, 4.1 Push rod, 5 Top cover, 5.1 Second rear enclosure wall, 5.11 Right side elevation, 5.2 Right enclosure wall, 6 Slot, 7 Shielding cover, 8 Through hole, 9 Operating mechanism, 10 Elastic component, 11 Lock, 12 Circuit board. Detailed Implementation

[0026] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0027] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] See Figure 1-7As shown in the figure, as an embodiment of the present invention, a tripping assembly for a circuit breaker is provided, including a contact unit 1, a side plate 2, a linkage 3, a trip unit 4, and a top cover 5. The trip unit 4 is an electromagnetic trip unit. The side plate 2 is installed inside the top cover 5. The trip unit 4 and the linkage 3 are arranged laterally on the same side of the side plate 2. The trip unit 4 has a push rod 4.1. The contact unit 1 is located below the linkage 3. A first enclosure is provided on the side plate 2 corresponding to the periphery of the trip unit 4. The top cover 5 is provided with a corresponding splicing assembly to the first enclosure on the periphery of the trip unit 4. The second enclosure is formed between the first and second enclosures, with a slot 6 formed at the push rod 4.1 of the trip unit 4. The linkage 3 is movably mounted on the side plate 2. The linkage 3 has a drive part 3.1 that cooperates with the push rod 4.1 of the trip unit 4. The drive part 3.1 is always in a blocking engagement with the slot 6 during its active stroke, so that the drive part 3.1 of the linkage 3, the first enclosure, and the second enclosure cooperate to form a closed isolation structure, thereby preventing the arc and gas generated by the breakage of the contact unit 1 from entering the trip unit 4. By offsetting the trip unit 4 to one side directly above the contact unit 1, the isolation structure separates the trip unit 4 from the contact unit 1, so that the arc and gas generated by the contact unit 1 during breakage will not enter the trip unit 4. This prevents foreign objects from adhering to the surface of the armature and yoke of the trip unit 4, affecting the contact air gap of the armature and yoke, extending the service life of the product and ensuring operational stability.

[0030] In this embodiment, a shielding cover 7 is provided on the outside of the trip unit 4. The shielding cover 7 is provided with a through hole 8 for the push rod 4.1 to make way. The through hole 8 is located on the side of the shielding cover 7 close to the isolation structure. The shielding cover 7 serves to shield the trip unit 4 and can also protect and isolate most of the area of ​​the trip unit 4 from electric arc and gas, thereby reducing the area of ​​the isolation structure. This allows the isolation structure to be mainly set on the side of the trip unit 4 facing the contact unit 1, reducing the processing cost. The through hole 8 is located on the side of the shielding cover 7 close to the isolation structure, which prevents electric arc and gas from entering the trip unit 4 through the through hole 8.

[0031] In this embodiment, the first enclosure includes a first rear enclosure 2.1 and a bottom enclosure 2.2 respectively located on the rear and bottom sides of the trip unit 4. The second enclosure includes a second rear enclosure 5.1 and a right enclosure 5.2 respectively located on the rear and right sides of the trip unit 4. The first rear enclosure 2.1 and the second rear enclosure 5.1 are spliced ​​together, and the bottom enclosure 2.2 and the right enclosure 5.2 are spliced ​​together. A slot 6 is formed between the first rear enclosure 2.1 and the second rear enclosure 5.1. The push rod 4.1 of the trip unit 4 and the driving part 3.1 of the linkage 3 are located on the front and rear sides of the slot 6, respectively. The through hole 8 on the periphery of the push rod 4.1 of the trip unit 4 is the weakest point in the sealing protection of the trip unit 4. Therefore, this arrangement makes the distance between the push rod 4.1 of the trip unit 4 and the contact unit 1 greater. Moreover, the through hole 8 and the slot 6 are arranged in a front-back direction, which is different from the flow direction of the electric arc and gas (upward). This ensures that even if the drive part 3.1 does not form a complete sealing fit with the slot 6 within its active stroke, the electric arc and gas generated by the contact unit 1 when it breaks the circuit are not easy to enter the trip unit 4 through the slot 6 and the through hole 8, resulting in better isolation and protection.

[0032] In this embodiment, the linkage 3 is elastically rotatably mounted on the side plate 2, and the rotation direction of the linkage 3 is up and down. The upper arc-shaped surface 2.11 and the lower arc-shaped surface 2.12 are formed on the upper and lower sides of the first rear wall 2.1 corresponding to the slot 6, respectively. The driving part 3.1 includes a driving plate 3.11 corresponding to the slot 6 and an upper arc-shaped plate 3.12 and a lower arc-shaped plate 3.13 respectively provided on the upper and lower sides of the driving plate 3.11. The arc centers of the lower arc surface 2.12 and the upper arc plate 3.12 are both located on the rotating shaft of the linkage 3. The upper arc plate 3.12 is always in clearance fit with the upper arc surface 2.11 (the gap is very small and uniform) during its active stroke to prevent electric arc and gas from entering the slot 6 from the top. The lower arc plate 3.13 is always in clearance fit with the lower arc surface 2.12 (the gap is very small and uniform) during its active stroke to prevent electric arc and gas from entering the slot 6 from the bottom, further improving the protective effect of the trip device 4.

[0033] Specifically, an upper serrated groove 3.14 is provided on the arc surface of the upper arc plate 3.12 near the upper arc surface 2.11. The upper serrated groove 3.14 is a right triangle with the right angle side at the bottom. This design provides better blocking effect for the electric arc and gas, and can effectively guide the electric arc and gas upward along the gap to the outside of the slot 6. A lower serrated groove 3.15 is provided on the arc surface of the lower arc plate 3.13 near the lower arc surface 2.12. The lower serrated groove 3.15 is a right triangle with the right angle side at the top. This design provides better blocking effect for the electric arc and gas, and can effectively guide the electric arc and gas downward along the gap to the outside of the slot 6.

[0034] In this embodiment, the first rear wall 2.1 has a left side facade 2.13 formed on the left side of the slot 6, and the second rear wall 5.1 has a right side facade 5.11 formed on the right side of the slot 6. The left side of the drive unit 3.1 is always in clearance fit with the left side facade 2.13 during its active stroke to prevent electric arc and gas from entering the slot 6 from the left. The right side of the drive unit 3.1 is always in clearance fit with the right side facade 5.11 during its active stroke to prevent electric arc and gas from entering the slot 6 from the right.

[0035] In this embodiment, a tripping mechanism is also included, installed on the side of the side plate 2 opposite to the linkage 3. The linkage 3 is provided with a pushing part 3.2, which is driven by the tripping mechanism to the contact unit 1. An elastic element 10, specifically a spring, is provided on the side plate 2 between the linkage 3 and the contact unit 1 to provide elastic force for the linkage 3 to rotate and reset. Specifically, the contact unit 1 includes a moving contact shaft 1.1, a moving contact 1.2, and a stationary contact 1.3. The moving contact 1.2 is installed on the moving contact shaft 1.1 and is in contact with or disconnected from the stationary contact 1.3. The tripping mechanism includes a locking buckle 11, a re-locking buckle, and a jumping buckle that are driven in sequence. The side plate 2 has a movable hole, one end of which passes through the movable hole and is driven by the pushing part 3.2. The jumping buckle is driven by the moving contact shaft 1.1.

[0036] In this embodiment, a circuit board 12 soldered onto the trip unit 4 is also included. The circuit board 12 is specifically installed on the front side of the trip unit 4 to facilitate automated production.

[0037] The present invention also provides a circuit breaker, specifically an electromagnetic residual current operated circuit breaker, which includes the tripping assembly and operating mechanism 9 described in the above embodiments. This arrangement can reduce the contamination of the armature and magnetic yoke surface of the trip unit 4 by electric arc and gas, improve the life of the trip unit 4, and thus greatly improve the electrical life of the product.

[0038] The leakage current action process of the circuit breaker in this embodiment is as follows:

[0039] When the operating mechanism 9 is in the closed position, when the trip unit 4 is activated, it pushes the linkage 3 to rotate clockwise downwards, thereby pushing the latch 11 to rotate, so that the latch 11 is no longer locked and latched, and then the trip unit rotates, the circuit breaker is opened, the moving contact shaft 1.1 rotates to the open position, the circuit breaker is opened, and the moving contact shaft 1.1 pushes the spring, thereby causing the linkage 3 to rotate counterclockwise upwards to reset, and then pushing the trip unit 4 to reset.

[0040] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail made to the invention without departing from the spirit and scope of the invention as defined in the appended claims fall within the protection scope of the invention.

Claims

1. A tripping assembly for a circuit breaker, characterized in that: The device includes a contact unit, a side plate, a linkage, a trip unit, and a top cover. The side plate is installed inside the top cover. The trip unit and the linkage are arranged laterally on the same side of the side plate. The trip unit has a push rod. The contact unit is located below the linkage. A first enclosure is provided on the side plate corresponding to the periphery of the trip unit. A second enclosure is provided on the top cover corresponding to the periphery of the trip unit and splicing with the first enclosure. A slot is formed between the first enclosure and the second enclosure at the push rod of the trip unit. The linkage is movably mounted on the side plate and has a drive part that cooperates with the push rod of the trip unit. The drive part is always in a sealing fit with the slot during its active stroke, so that the drive part of the linkage, the first enclosure, and the second enclosure cooperate to form a closed isolation structure, thereby preventing the arc and gas generated by the breakage of the contact unit from entering the trip unit.

2. The tripping assembly of the circuit breaker according to claim 1, characterized in that: The trip unit is covered with a shield, which has a through hole for the push rod to make way, and the through hole is located on the side of the shield near the isolation structure.

3. The tripping assembly of the circuit breaker according to claim 1, characterized in that: The first enclosure includes a first rear enclosure and a bottom enclosure, respectively, located on the rear and bottom sides of the trip unit. The second enclosure includes a second rear enclosure and a right enclosure, respectively, located on the rear and right sides of the trip unit. The first rear enclosure and the second rear enclosure are spliced ​​together, and the bottom enclosure and the right enclosure are spliced ​​together. A slot is formed between the first rear enclosure and the second rear enclosure. The push rod of the trip unit and the driving part of the linkage are located on the front and rear sides of the slot, respectively.

4. The tripping assembly of the circuit breaker according to claim 3, characterized in that: The linkage is flexibly rotatably mounted on the side plate. The upper and lower sides of the first rear wall corresponding to the slot are respectively formed with an upper arc surface and a lower arc surface. The driving part includes a driving plate corresponding to the slot and an upper arc plate and a lower arc plate respectively provided on the upper and lower sides of the driving plate. The arc centers of the upper arc plate, the upper arc surface, the lower arc plate, and the lower arc surface are all located on the rotating shaft of the linkage. The upper arc plate is always in clearance fit with the upper arc surface during its active stroke to prevent electric arc and gas from entering the slot from the upper side. The lower arc plate is always in clearance fit with the lower arc surface during its active stroke to prevent electric arc and gas from entering the slot from the lower side.

5. The tripping assembly of the circuit breaker according to claim 4, characterized in that: An upper serrated groove is provided on the side of the upper arc plate near the upper arc surface. The upper serrated groove is a right triangle with the right angle side located on the bottom side.

6. The tripping assembly of the circuit breaker according to claim 4, characterized in that: A lower serrated groove is provided on the arc surface of the lower arc plate near the lower arc surface. The lower serrated groove is a right triangle with the right angle side located on the top side.

7. The tripping assembly of the circuit breaker according to claim 4, characterized in that: The first rear enclosure has a left side facade on the left side corresponding to the slot, and the second rear enclosure has a right side facade on the right side corresponding to the slot. The left side of the drive unit is always in clearance fit with the left side facade during its active stroke to prevent electric arc and gas from entering the slot from the left. The right side of the drive unit is always in clearance fit with the right side facade during its active stroke to prevent electric arc and gas from entering the slot from the right.

8. The tripping assembly of the circuit breaker according to claim 1, characterized in that: It also includes a tripping mechanism installed on the side of the side plate away from the linkage component. The linkage component is provided with a pushing part, which is driven and cooperates with the contact unit through the tripping mechanism. An elastic element is provided on the side plate between the linkage component and the contact unit to provide elastic force for the linkage component to rotate and reset.

9. The tripping assembly of the circuit breaker according to claim 7, characterized in that: The contact unit includes a moving contact shaft, a moving contact, and a stationary contact. The moving contact is mounted on the moving contact shaft and is in contact with or disconnected from the stationary contact. The tripping mechanism includes a locking latch, a re-locking latch, and a tripping latch that are driven in sequence. A movable hole is provided on the side plate. One end of the locking latch passes through the movable hole and is driven in conjunction with the pushing part. The tripping latch is driven in conjunction with the moving contact shaft.

10. The tripping assembly of the circuit breaker according to claim 1, characterized in that: It also includes the circuit board soldered onto the trip unit.

11. A circuit breaker, characterized in that: The circuit breaker includes the tripping assembly and operating mechanism as described in any one of claims 1-10.

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