Moving and static contact opening distance adjusting mechanism of circuit breaker and circuit breaker

Abstract

The utility model discloses a moving and static contact opening distance adjusting mechanism of a circuit breaker and the circuit breaker, comprising an adjusting piece connected with a cantilever on a main shaft of the circuit breaker and a connecting rod connected with a moving contact assembly of the circuit breaker, the adjusting part is movably connected to the cantilever, and an adjusting structure used for adjusting the connecting position of the adjusting part relative to the cantilever is arranged between the adjusting part and the cantilever. According to the utility model, the adjusting piece is arranged between the cantilever and the connecting rod of the circuit breaker, and the connecting position of the adjusting piece relative to the cantilever is adjusted by the adjusting structure, so that the adjusting piece can drive the connecting rod to generate displacement so as to drive the moving contact assembly of the circuit breaker connected with the connecting rod to move; and the opening distance between the moving contact assembly and the corresponding static contact assembly in the opening state of the circuit breaker is changed, so that the action consistency of each phase of contact in the circuit breaker is adjusted, and the electrical performance stability of the circuit breaker is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a moving and static contact opening distance adjustment mechanism of a circuit breaker and the circuit breaker. Background Art

[0002] The mechanical structure components of the frame circuit breaker are mainly composed of an operating mechanism, a main shaft assembly, a moving contact assembly, a static contact assembly, etc., and the cantilever on the main shaft assembly is driven and connected to the moving contact assembly through a connecting rod structure. When the circuit breaker is in the closed position and receives an opening command, the operating mechanism is activated to drive the main shaft to rotate, and then the cooperation between the cantilever and the connecting rod drives the moving contact assembly to move and disconnect from the corresponding static contact assembly, so that a certain distance (opening distance) is formed between the moving contact assembly and the static contact assembly to meet the electrical insulation requirements and cut off the circuit. However, in the frame circuit breaker of the prior art, due to problems with the production process and assembly accuracy of various parts such as connecting rods and cantilevers, there are certain deviations in the installation positions, which ultimately affect the differences in the opening distances of the contacts of each phase of the circuit breaker. When the circuit breaker is opening and closing operations, inconsistent movements of the contacts of each phase will directly affect its electrical performance. Utility Model Content

[0003] In view of the deficiencies of the prior art, the present invention provides a moving and static contact distance adjustment mechanism for a circuit breaker, which can independently adjust the distance between a moving contact assembly of a certain phase and a corresponding static contact assembly in the circuit breaker.

[0004] To achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:

[0005] A mechanism for adjusting the distance between moving and static contacts of a circuit breaker comprises an adjusting member connected to a cantilever on a main shaft of the circuit breaker and a connecting rod connected to a moving contact assembly of the circuit breaker. The adjusting member and the connecting rod have opposite ends that are movably hinged together via a hinge structure. The adjusting member is movably connected to the cantilever and an adjusting structure for adjusting the connection position of the adjusting member relative to the cantilever is provided between the adjusting member and the cantilever.

[0006] Furthermore, a rotating connection part, a hinged part and an adjusting connection part are formed on the adjusting part. The adjusting part is rotatably connected to the cantilever through the rotating connection part. The hinged part and the adjusting connection part are arranged at an angle with the rotating connection part as the rotation center. An adjusting structure is arranged between the adjusting connection part and the cantilever. The adjusting structure adjusts the connection position of the adjusting part relative to the cantilever and thereby controls the adjusting part to rotate relative to the cantilever around the rotation center of its rotating connection part.

[0007] Furthermore, the adjustment structure includes an adjusting bolt, and an ear plate is formed on the cantilever. The ear plate is provided with a threaded hole that is compatible with the adjusting bolt. The adjusting bolt is screwed together with the threaded hole, and one end of the adjusting bolt is connected to the adjusting connection part of the adjusting member. By rotating the adjusting bolt, the adjusting bolt is reciprocated and moved horizontally along the vertical direction of the ear plate, thereby pushing the adjusting member to rotate relative to the cantilever around the rotation center of its rotating connection part.

[0008] Furthermore, the adjusting connection part is provided with an embedding groove adapted to the nut of the adjusting bolt, and the nut is at least partially engaged with the embedding groove of the adjusting connection part so that the adjusting part can be driven to rotate forward and reverse relative to the cantilever by rotating the adjusting bolt.

[0009] Furthermore, the adjusting connection portion is provided with a hook claw adapted to be clamped on the screw rod of the adjusting bolt.

[0010] Furthermore, a locking nut is screwed onto the screw rod of the adjusting bolt.

[0011] Furthermore, a concave screwing hole is provided at the end of the screw rod of the adjusting bolt. Preferably, the screwing hole is a hexagonal hole structure.

[0012] Furthermore, a rotating shaft hole is provided on the rotating connection portion, and a cantilever through hole corresponding to the rotating shaft hole is provided on the cantilever. The rotating shaft hole and the cantilever through hole are rotatably connected together via a pin shaft.

[0013] Furthermore, a hinge hole is provided on the hinge portion, and the connecting rod and the hinge portion are hinged together via a hinge shaft.

[0014] Based on the same inventive concept, the present invention also provides a circuit breaker, comprising any one of the above-mentioned moving and static contact distance adjustment mechanisms of the circuit breaker.

[0015] The above technical solution has the following advantages or beneficial effects:

[0016] In the movable and static contact spacing adjustment mechanism of the circuit breaker and the circuit breaker described in the utility model, an adjustment member is provided between the cantilever and the connecting rod of the circuit breaker, and the adjustment structure is used to adjust the connection position of the adjustment member relative to the cantilever. In this way, the adjustment member can drive the connecting rod to produce displacement, thereby driving the movable contact assembly of the circuit breaker connected to the connecting rod to move, thereby changing the spacing between the movable contact assembly and the corresponding static contact assembly when the circuit breaker is in the open state, so as to adjust the action consistency of the contacts of each phase in the circuit breaker, thereby ensuring the stability of the electrical performance of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural diagram of the moving and static contact distance adjustment mechanism of the embodiment of the utility model.

[0018] Figure 2 It is a schematic diagram of the assembly of the moving and static contact spacing adjustment mechanism and the moving contact assembly in an embodiment of the present utility model.

[0019] Figure 3 It is a schematic diagram of the exploded structure of the moving and static contact spacing adjustment mechanism and the moving contact assembly in an embodiment of the present utility model.

[0020] Description of labels:

[0021] 1. Circuit breaker main shaft, 2. Adjusting part, 3. Moving contact assembly, 4. Connecting rod, 5. Adjusting structure, 6. Pin shaft, 7. Articulated shaft, 11. Cantilever, 21. Rotating connection part, 22. Articulated part, 23. Adjusting connection part, 51. Adjusting bolt, 52. Locking nut, 111. Ear plate, 231. Embedded slot, 232. Hook, 511. Nut, 512. Screw. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0024] Please refer to the attached Figure 1 To the attached Figure 3 One embodiment of the present invention provides a mechanism for adjusting the distance between movable and static contacts of a circuit breaker, comprising an adjusting member 2 connected to a cantilever 11 on a main shaft 1 of the circuit breaker and a connecting rod 4 connected to a movable contact assembly 3 of the circuit breaker. The adjusting member 2 and the connecting rod 4 are movably hinged at opposite ends thereof via a hinge structure. The adjusting member 2 is movably connected to the cantilever 11, and an adjusting structure 5 is provided between the adjusting member 2 and the cantilever 11 for adjusting the connection position of the adjusting member 2 relative to the cantilever 11. It will be appreciated that in this embodiment, by disposing the adjusting member 2 between the cantilever 11 and the connecting rod 4 of the circuit breaker and adjusting the connection position of the adjusting member 2 relative to the cantilever 11 by the adjusting member 2, the connecting rod 4 is displaced by the adjusting member 2, thereby causing the movable contact assembly 3 of the circuit breaker connected to the connecting rod 4 to move, thereby changing the distance between the movable contact assembly 3 and the corresponding static contact assembly when the circuit breaker is in the open state, thereby adjusting the operational consistency of the contacts of each phase in the circuit breaker, thereby ensuring stable electrical performance of the circuit breaker. In addition, the application of the moving and static contact distance adjustment mechanism can also reduce the production and assembly accuracy requirements of various parts to a certain extent.

[0025] Please refer to the attached Figure 1 To the attached Figure 3 In one preferred embodiment, a rotating connection portion 21, a hinge portion 22 and an adjusting connection portion 23 are formed on the adjusting member 2. The adjusting member 2 is rotatably connected to the cantilever 11 through the rotating connection portion 21. The hinge portion 22 and the adjusting connection portion 23 are arranged at an angle with the rotating connection portion 21 as the rotation center. An adjusting structure 5 is provided between the adjusting connection portion 23 and the cantilever 11. The adjusting structure adjusts the connection position of the adjusting member 2 relative to the cantilever 11 and thereby controls the adjusting member 2 to rotate relative to the cantilever 11 around the rotation center of its rotating connection portion 21. The adjustment structure 5 includes an adjusting bolt 51. An ear plate 111 is formed on the cantilever 11. The ear plate 111 is provided with a threaded hole that matches the adjusting bolt 51. The adjusting bolt 51 is screwed together with the threaded hole, and one end of the adjusting bolt 51 is connected to the adjusting connection portion 23 of the adjusting member 2. By rotating the adjusting bolt 51, the adjusting bolt 51 is reciprocated along the vertical direction of the ear plate 111, thereby pushing the adjusting member 2 to rotate relative to the cantilever 11 around the rotation center of its rotating connection portion 21. During the adjustment process, the lateral expansion and contraction of the adjusting bolt 51 relative to the cantilever 11 can be converted into rotational movement of the adjusting member 2 relative to the cantilever 11 by rotating the adjusting bolt 51. In this way, the holding position of the connecting rod 4 in the open state can be changed, and the holding position of the circuit breaker moving contact assembly 3 in the open state can be adjusted to achieve the effect of changing the opening distance between the moving and static contact main bodies of the circuit breaker in the open state.

[0026] Please refer to the attached Figure 1 To the attached Figure 3 In one preferred embodiment, the adjustment connection portion 23 is provided with an embedding groove 231 adapted to engage with the nut 511 of the adjustment bolt 51. The nut 511 is at least partially engaged with the embedding groove 231 of the adjustment connection portion 23, so that rotation of the adjustment bolt 51 drives the adjustment member 2 to rotate forward and reverse relative to the cantilever 11. The adjustment connection portion 23 is also provided with a hook 232 adapted to engage with the screw 512 of the adjustment bolt 51.

[0027] Please refer to the attached Figure 1 To the attached Figure 3 In one preferred embodiment, a locking nut 52 is threaded onto the screw rod 512 of the adjusting bolt 51. The locking nut 52 secures the adjusting bolt 51 in its telescopic position relative to the lug 111, preventing the adjusting bolt 51 from being accidentally actuated and thereby changing the distance between the corresponding moving and static contacts in the open state.

[0028] Please refer to the attached Figure 1 To the attached Figure 3In one preferred embodiment, the end of the screw rod 512 of the adjusting bolt 51 has a recessed screwing hole, preferably a hexagonal hole. During adjustment, a hexagonal wrench can be used to engage the hexagonal hole at the end of the inner screw rod 512 to perform a screwing operation from the relatively exposed end of the screw rod 512 (the end away from the nut 511), thereby achieving the effect of conveniently adjusting the opening distance.

[0029] Please refer to the attached Figure 1 To the attached Figure 3 In one preferred embodiment, a rotation axis hole is defined on the rotation connection portion 21, and a cantilever through hole corresponding to the rotation axis hole is defined on the cantilever 11. The rotation axis hole and the cantilever through hole are rotationally connected together via a pin 6. Preferably, a hinge hole is defined on the hinge portion 22, and the connecting rod 4 and the hinge portion 22 are hinged together via a hinge shaft 7.

[0030] An embodiment of the present invention further provides a circuit breaker, comprising the moving and static contact distance adjustment mechanism of the circuit breaker of any of the above embodiments.

[0031] In addition, in a four-pole switch, since the neutral pole is required to close before other phase contacts and open after other phase contacts, that is, close first and open later, in the existing technology, due to production and assembly errors of parts, the neutral pole may not meet the requirement of closing first and opening later, resulting in a safety hazard. The above-mentioned moving and static contact opening distance adjustment mechanism can be used to adjust the opening distance of the neutral pole to meet the requirement of closing first and opening later, thereby improving the safety and reliability of circuit breaker operation.

[0032] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present invention.

Claims

1. A moving and static contact distance adjustment mechanism for a circuit breaker, characterized by: The invention comprises an adjusting member (2) connected to a cantilever (11) on a main shaft (1) of a circuit breaker and a connecting rod (4) connected to a movable contact assembly (3) of the circuit breaker. The adjusting member (2) and the connecting rod (4) are movably hinged together at opposite ends via a hinge structure. The adjusting member (2) is movably connected to the cantilever (11), and an adjusting structure (5) for adjusting the connection position of the adjusting member (2) relative to the cantilever (11) is provided between the adjusting member (2) and the cantilever (11).

2. The moving and static contact distance adjustment mechanism of a circuit breaker according to claim 1, characterized in that: The adjusting member (2) is formed with a rotating connection portion (21), a hinge portion (22) and an adjusting connection portion (23). The adjusting member (2) is rotatably connected to the cantilever (11) via the rotating connection portion (21). The hinge portion (22) and the adjusting connection portion (23) are arranged at an angle with the rotating connection portion (21) as the rotation center. An adjusting structure (5) is arranged between the adjusting connection portion (23) and the cantilever (11). The adjusting structure (5) adjusts the connection position of the adjusting member (2) relative to the cantilever (11) and thereby controls the adjusting member (2) to perform rotational motion relative to the cantilever (11) around the rotation center of its rotating connection portion (21).

3. The moving and static contact distance adjustment mechanism of the circuit breaker according to claim 2, characterized in that: The adjusting structure (5) includes an adjusting bolt (51). An ear plate (111) is formed on the cantilever (11). The ear plate (111) is provided with a threaded hole adapted to the adjusting bolt (51). The adjusting bolt (51) is screwed to the threaded hole, and one end of the adjusting bolt (51) is connected to the adjusting connection portion (23) of the adjusting member (2). By rotating the adjusting bolt (51), the adjusting bolt (51) is moved back and forth along the vertical direction of the ear plate (111), thereby pushing the adjusting member (2) to rotate relative to the cantilever (11) around the rotation center of its rotation connection portion (21).

4. The moving and static contact distance adjustment mechanism of a circuit breaker according to claim 3, characterized in that: The adjusting connection portion (23) is provided with an embedding groove (231) adapted to the nut (511) of the adjusting bolt (51), and the nut (511) is at least partially engaged with the embedding groove (231) of the adjusting connection portion (23), so that the adjusting bolt (51) is rotated to drive the adjusting member (2) to perform forward and reverse rotational motion relative to the cantilever (11).

5. The moving and static contact distance adjustment mechanism of the circuit breaker according to claim 4, characterized in that: The adjusting connection portion (23) is further provided with a hook (232) adapted to be clamped on the screw rod (512) of the adjusting bolt (51).

6. The moving and static contact distance adjustment mechanism of a circuit breaker according to claim 4, characterized in that: A locking nut (52) is screwed onto the screw rod (512) of the adjusting bolt (51).

7. The moving and static contact distance adjustment mechanism of a circuit breaker according to claim 4, characterized in that: The end of the screw rod (512) of the adjusting bolt (51) is provided with a concave screwing hole.

8. The moving and static contact distance adjustment mechanism of a circuit breaker according to claim 2, characterized in that: A rotating shaft hole is provided on the rotating connecting portion (21), and a cantilever through hole corresponding to the rotating shaft hole is provided on the cantilever (11). The rotating shaft hole and the cantilever through hole are rotatably connected together via a pin shaft (6).

9. The moving and static contact distance adjustment mechanism of a circuit breaker according to claim 2, characterized in that: A hinge hole is provided on the hinge portion (22), and the connecting rod (4) and the hinge portion (22) are hinged together via a hinge shaft (7).

10. A circuit breaker, characterized in that: The invention comprises a moving and static contact distance adjustment mechanism of a circuit breaker according to any one of claims 1 to 9.

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