Moving contact mechanism of circuit breaker

Abstract

The utility model provides a moving contact mechanism of a circuit breaker. The moving contact mechanism comprises a base, a bottom plate, a static contact assembly, a moving contact assembly and an arc extinguish chamber assembly. The moving contact assembly comprises a moving contact support, a magnetic steel sheet, a contact spring, a main contact, an arc contact, an insulating plate, a busbar and a fixing frame. The busbar is mounted on the left side bottom plate; the fixing frame is mounted on the bottom plate; one end of the moving contact support is rotatably installed on the fixing frame. The arc contact is installed on the moving contact support. The main contact is installed on the arc contact. The magnetic steel sheet is installed on the moving contact support. The moving contact support is provided with a groove capable of accommodating metal particles. The magnetic steel sheets are installed in the grooves. The circuit breaker is simple in structure, metal particles accumulated in the breaking process of the circuit breaker are adsorbed through the magnetic steel sheet, the metal particles are collected through the grooves, and the phenomena that a moving contact in the circuit breaker is not smooth in rotation, the breaking speed is reduced, and the moving contact is severely stuck are prevented.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the circuit breaker technical field, and specifically relates to a moving contact mechanism of circuit breaker. BACKGROUND

[0002] The universal circuit breaker is used for distributing electric energy and protecting lines and power supply equipment from the damage of overload, under-voltage, short circuit, single-phase grounding and the like, and has an isolation function simultaneously. The circuit breaker is matched with intelligent multiple protection functions, can avoid unnecessary sudden power failure while realizing high-precision selective protection, improves the reliability and safety of the power supply system, and is an important electrical component in intelligent distribution network.

[0003] In the prior art, the moving contact of the universal circuit breaker is a key component for on-off current, and the contact spring in the moving contact component is a key part for ensuring on-off. In the on-off process, the moving contact is driven to contact and separate from the static contact through linkage of the operating mechanism, so that the carrying and breaking current are realized. However, a large amount of arc is generated when breaking the fault current, the high temperature and thermal effect of the arc cause the metal particle ejection phenomenon of the metal components in contact with the arc. After a long time of breaking and accumulation, a large amount of metal particles are generated in the circuit breaker. The cooled metal particles not only adhere to the surface of the moving contact assembly, but also fill the gap between the moving contact and the insulating shell of the circuit breaker, so that the moving contact is not smooth in rotation, the breaking speed is reduced, and the circuit breaker is even stuck, which directly affects the protection performance of the circuit breaker. Meanwhile, the high temperature also causes the material performance of the moving contact spring to change, so that the hardness of the moving contact spring is reduced, the toughness is deteriorated, the fatigue life of the spring is shortened, the spring is even invalid, the contact and separation of the moving contact of the circuit breaker are affected, and great safety hazards exist. CONTENT OF THE UTILITY MODEL

[0004] In view of the above problems, the utility model aims to provide a circuit breaker which can effectively absorb the metal particles accumulated by breaking, prevent the contact spring from being deformed by heat caused by contact with the contact piece, and prevent the circuit breaker from being stuck.

[0005] The utility model is implemented through the following technical solutions:

[0006] A movable contact mechanism of a circuit breaker, comprising a base, a bottom plate, a stationary contact assembly and a movable contact assembly; the base and the bottom plate are cooperatively installed to form a cavity for installing the stationary contact assembly and the movable contact assembly; the stationary contact assembly is installed in the middle of the upper surface of the bottom plate; the movable contact assembly is movably installed in the middle of the cavity and cooperates with the stationary contact assembly (all of the above are prior art); the movable contact assembly comprises a movable contact support, a magnetic steel sheet, a contact spring, a main contact, an arc contact, an insulating plate, a busbar and a fixing frame; the busbar is installed on the left side of the bottom plate; the fixing frame is installed on the bottom plate; one end of the movable contact support is rotatably installed on the fixing frame; the arc contact is rotatably installed on the movable contact support; one end of the contact spring is installed at the bottom of the contact support and the other end is connected with the top of a partition piece; the main contact and the arc contact are installed side by side on the movable contact support; the partition piece is installed between the main contact and the arc contact; the insulating plate is arranged below the arc contact; the magnetic steel sheet is installed on the movable contact support and above the arc contact; a groove for containing metal particles is arranged on the right side surface of the movable contact support and above the arc contact; the magnetic steel sheet is installed in the groove; the main contact comprises a contact piece, a silver contact point and a partition piece; the silver contact point is arranged at the bottom of the contact piece; the partition piece is installed between the main contact and the arc contact; a contact cavity for installing the arc contact is arranged below the right end of the movable contact support; a spring mounting hole for installing the contact spring is arranged on the movable contact support; the partition piece is provided with a bent baffle; one end of the contact spring is installed at the bottom of the contact support and the other end is connected with the bent baffle at the top of the partition piece; the bent baffle is used for separating the contact spring from the contact piece; the movable contact mechanism further comprises an arc-extinguishing chamber assembly installed in the right side of the cavity; an inclined guide surface is arranged at the right end of the movable contact support.

[0007] The utility model discloses the beneficial effect that:

[0008] The utility model discloses simple structure, through magnetic steel sheet adsorption circuit breaker in the process of breaking down accumulated metal particles, and through the recess collection metal particles, prevent the movable contact of circuit breaker from rotating not smoothly, and breaking down speed drops, and when serious, appear the deadlock phenomenon. BRIEF DESCRIPTION OF DRAWINGS

[0009] The utility model makes further detailed explanation in combination with the drawings.

[0010] Figure 1 It is the structure explosion map of the utility model.

[0011] Figure 2 It is the structure schematic view of the movable contact assembly in the utility model.

[0012] Figure 3 It is the structure schematic view of the movable contact support in the utility model.

[0013] Figure 4 is a partial schematic view of the moving contact assembly in the utility model.

[0014] Figure 5 is a schematic view of the main contact in the utility model.

[0015] Figure 6 is a schematic view of the partition member in the utility model.

[0016] Figure 7 is a schematic view of the circuit breaker in the on state in the utility model.

[0017] Figure 8 is a schematic view of the circuit breaker in the off state in the utility model.

[0018] In the drawing: 1 - base; 2 - bottom plate; 3 - stationary contact assembly; 4 - moving contact assembly; 5 - arc chamber assembly; 1A - cavity; 41 - moving contact support; 42 - magnetic steel sheet; 43 - contact spring; 44 - main contact; 45 - arc contact; 46 - insulating plate; 47 - female busbar; 48 - fixing frame; 411 - groove; 412 - spring mounting hole; 413 - contact cavity; 441 - contact piece; 442 - silver contact point; 443 - partition member; 4431 - bent baffle. DETAILED DESCRIPTION

[0019] The implementation of the utility model will be illustrated by specific embodiments below, and other advantages and effects of the utility model can be easily understood by those skilled in the art from the content disclosed in the specification.

[0020] It should be understood that the structures, proportions, sizes, etc. shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification for understanding and reading by those skilled in the art, and do not define the limiting conditions for the implementation of the utility model, so they do not have technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. cited in the specification are only for clear description, and not for limiting the scope of the utility model. The change or adjustment of the relative relationship without substantial change of the technical content is also considered as the implementation scope of the utility model.

[0021] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, term '' connected '' '' connection '' should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can through the indirect connection of intermediate medium. For ordinary skilled person in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to specific circumstances. It needs to explain, term '' include '' '' contain '' or any other variant is intended to cover non-exclusive inclusion, so that the process, method, article or equipment containing a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes the element inherent to such process, method, article or equipment.

[0022] As Figures 1-6 The moving contact mechanism of a circuit breaker comprises a base 1, a bottom plate 2, a static contact assembly 3, a moving contact assembly 4, an arc-extinguishing chamber assembly 5 and a cavity 1A.

[0023] The base 1 and the bottom plate 2 are cooperatively installed to form the cavity 1A for installing the static contact assembly 3, the moving contact assembly 4 and the arc-extinguishing chamber assembly 5; the arc-extinguishing chamber assembly 5 is installed at the right side in the cavity 1A; the static contact assembly 3 is installed on the middle of the upper surface of the bottom plate 2; and the moving contact assembly 4 is movably installed in the middle of the cavity 1A and cooperates with the static contact assembly 3.

[0024] The moving contact assembly 4 comprises a moving contact bracket 41, a magnetic steel sheet 42, a contact spring 43, a partition piece 443, a main contact 44, an arc contact 45, an insulation plate 46, a busbar 47 and a fixing frame 48; the busbar 47 is installed on the left bottom plate 2; the fixing frame 48 is installed on the bottom plate 2; one end of the moving contact bracket 41 is rotatably installed on the fixing frame 48; the arc contact 45 is rotatably installed on the moving contact bracket 41; one end of the contact spring 43 is installed on the bottom of the contact bracket 41, and the other end is connected with the top of the partition piece 443; the main contact 44 and the arc contact 45 are installed side by side on the moving contact bracket 41; the partition piece 443 is installed between the main contact 44 and the arc contact 45; the arc contact 45 is provided with a notch for installing the main contact 44; the insulation plate 46 is arranged below the arc contact 45; the magnetic steel sheet 42 is installed on the moving contact bracket 41 and above the arc contact 45; the moving contact bracket 41 is provided with a groove 411 capable of containing metal particles and above the arc contact 45; the magnetic steel sheet 42 is installed in the groove 411; and the right end of the moving contact bracket 41 is provided with an inclined guide surface.

[0025] The main contact 44 comprises a contact piece 441 and a silver contact 442; the silver contact 442 is arranged at the bottom of the contact piece 441; and the partition piece 443 is arranged between the main contact 44 and the arc contact 45.

[0026] The lower right end of the movable contact support 41 is provided with a contact cavity 413 for mounting the arc contact 45.

[0027] The movable contact support 41 is provided with a spring mounting hole 412 for mounting the contact spring 43.

[0028] If the contact spring 43 directly presses on the contact piece 441, both of them will be affected by the heat conduction of the current or arc, resulting in spring deformation, contact pressure reduction, product temperature rise, and short-time withstand current influence, therefore, the partition piece 443 is provided with a bent baffle 4431, one end of the contact spring 43 is mounted at the bottom of the contact support 41, and the other end is connected with the bent baffle 4431 at the top of the partition piece 443, and the bent baffle 4431 is used for separating the contact spring 43 from the contact piece 441.

[0029] In order to enhance the attraction and accommodation of the metal particles and prevent the metal particles from flowing out of the gap again, the movable contact support 41 is provided with a groove 411 for accommodating the metal particles and located above the arc contact 45; the magnetic steel sheet 42 is mounted in the groove 411; and the right end of the movable contact support 41 is provided with an inclined guide surface, so that the metal particles can more easily enter the groove 411.

[0030] Working steps:

[0031] As shown in Figure 7 and Figure 8 respectively are the on and off state diagrams of the circuit breaker in the utility model, the movable contact assembly 4 rotates in the cavity 1A to realize on and off, since a large amount of arc is generated when off the fault current, the high temperature and thermal effect of the arc result in the metal particle ejection phenomenon of the metal parts in contact with the arc, after a long time of off and accumulation, a large amount of metal particles are generated in the circuit breaker, the metal particles are adsorbed by the magnetic steel sheet 42, pass through the inclined guide surface of the movable contact support 41 and are collected in the groove 411, so that the metal particles after cooling not only adhere to the surface of the movable contact assembly 4, but also fill the gap between the movable contact assembly 4 and the insulating shell of the circuit breaker, resulting in the incoordination of the rotation of the movable contact and the decrease of the off speed.

[0032] The protection scope of the utility model is not limited to the technical solutions disclosed in the specific embodiments, and any modification, equivalent replacement, improvement and the like made according to the technical essence of the utility model to the above embodiments all fall into the protection scope of the utility model.

Claims

1. A moving contact mechanism for a circuit breaker, comprising a base (1), a bottom plate (2), a stationary contact assembly (3), and a moving contact assembly (4); the base (1) and the bottom plate (2) are fitted together to form a cavity (1A) for mounting the stationary contact assembly (3) and the moving contact assembly (4); the stationary contact assembly (3) is mounted on the middle of the upper surface of the bottom plate (2); the moving contact assembly (4) is movably mounted in the middle of the cavity (1A) and cooperates with the stationary contact assembly (3); characterized in that... The moving contact assembly (4) includes: a moving contact bracket (41), a magnet (42), a contact spring (43), a partition (443), a main contact (44), an arc contact (45), an insulating plate (46), a busbar (47), and a fixing frame (48); the busbar (47) is installed on the left side of the base plate (2); the fixing frame (48) is installed on the base plate (2); one end of the moving contact bracket (41) is rotatably installed on the fixing frame (48); the arc contact (45) is rotatably installed on the moving contact bracket. The contact spring (43) is mounted on the bottom of the contact support (41) at one end and connected to the top of the partition (443) at the other end; the main contact (44) and the arc contact (45) are mounted side by side on the moving contact support (41); the partition (443) is mounted between the main contact (44) and the arc contact (45); the insulating plate (46) is located below the arc contact (45); the magnet (42) is mounted on the moving contact support (41) and located above the arc contact (45).

2. The moving contact mechanism of a circuit breaker according to claim 1, characterized in that... The moving contact bracket (41) has a groove (411) on its right side surface that can accommodate metal particles, and is located above the arc contact (45); the magnet (42) is installed in the groove (411).

3. The moving contact mechanism of a circuit breaker according to claim 1, characterized in that... The main contact (44) includes a contact piece (441) and a silver contact (442); the silver contact (442) is disposed at the bottom of the contact piece (441).

4. The moving contact mechanism of a circuit breaker according to claim 1, characterized in that... The right end of the moving contact bracket (41) is provided with a contact cavity (413) for installing the arc contact (45).

5. The moving contact mechanism of a circuit breaker according to claim 1, characterized in that... The moving contact bracket (41) is provided with a spring mounting hole (412) for mounting the contact spring (43).

6. The moving contact mechanism of a circuit breaker according to claim 1, characterized in that... The partition (443) is provided with a bending baffle (4431). One end of the contact spring (43) is installed at the bottom of the contact bracket (41), and the other end is connected to the bending baffle (4431) at the top of the partition (443). The bending baffle (4431) is used to separate the contact spring (43) from the contact plate (441).

7. The moving contact mechanism of a circuit breaker according to claim 1, characterized in that... It also includes an arc-extinguishing chamber assembly (5), which is installed on the right side inside the cavity (1A).

8. The moving contact mechanism of a circuit breaker according to claim 1, characterized in that... The right end of the moving contact bracket (41) is provided with an inclined guide surface.

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