A molded case circuit breaker with anti-shaking structure of terminal strip

Abstract

The utility model relates to the field of circuit breaker discloses a plastic -clad circuit breaker containing wiring row anti -shaking structure, including the shell body, the inner wall of shell body is opened has the mounting groove, the inner wall fixed connection has the wiring frame of mounting groove, the inner wall sliding connection has the pressing piece of wiring frame, the top rotation is connected with bolt of pressing piece, the outer wall of shell body is provided with fastening anti -shaking mechanism, fastening anti -shaking mechanism includes fastening dustproof subassembly, fastening dustproof subassembly includes apron, apron is hinged in the outer wall of shell body. In the utility model, the apron of fastening dustproof subassembly drives the plugging block to block the placement groove, and the elastic clamping block realizes the stable fixation of the plugging block, the extrusion pad enhances the sealing effect, effectively blocks the intrusion path of impurity, and the extrusion gasket can alleviate the situation that the bolt is loose and self-rotates and separates when shaking, reduces the influence on the insulation performance, reduces the failure probability, prolongs the service life of plastic -clad circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of circuit breakers, and in particular to a molded case circuit breaker with a terminal block anti-sway structure. Background Technology

[0002] Molded case circuit breakers (MCCBs) are core protection components in low-voltage power distribution systems and are widely used in industrial production lines, building power distribution, rail transportation, and other fields. They encapsulate internal conductive components with a plastic insulating shell and can automatically cut off the power supply when faults such as overload, short circuit, and undervoltage occur in the circuit, thereby ensuring the safety of electrical equipment and personal safety.

[0003] In existing technologies, the terminal blocks of molded case circuit breakers typically employ a bolt-pressed structure. Specifically, tightening the bolts drives a clamping plate or a compression washer, thereby clamping the wires within the terminal block. However, the connected wires, especially multi-strand flexible wires, are prone to slight wobble at the connection points under external vibration or accidental tension. Over time, this can lead to loose connections, increased contact resistance, and consequently, localized overheating, posing a safety hazard. Furthermore, the bolt operating ports at the circuit breaker terminals are usually open designs, allowing dust and impurities to easily enter the circuit breaker's interior during long-term use, potentially affecting the insulation performance and lifespan of internal components. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a molded case circuit breaker with a terminal block anti-sway structure, which aims to improve the problem in the prior art that "dust and impurities at the bolt operating port of the circuit breaker connection can easily enter the circuit breaker from this point, and the multi-strand flexible wires can become loose under external vibration or accidental tension".

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a molded case circuit breaker with a terminal block anti-sway structure, comprising an outer casing, an inner wall of which has an installation groove, a terminal frame fixedly connected to the inner wall of the installation groove, a pressure plate slidably connected to the inner wall of the terminal frame, a bolt rotatably connected to the top of the pressure plate, and an anti-sway fastening mechanism provided on the outer wall of the outer casing, the anti-sway fastening mechanism including a dustproof fastening component, the dustproof fastening component including a cover plate, the cover plate being hinged to the outer wall of the outer casing, a sealing block slidably connected to the inner wall of the cover plate, a compression pad fixedly connected to one end of the sealing block, a pressing block slidably connected to the other end of the sealing block, an elastic locking block fixedly connected to the bottom of the pressing block, and the pressing block and the sealing block being elastically connected by a spring.

[0006] As a further description of the above technical solution: The fastening and anti-sway mechanism includes an anti-sway component, which includes a support plate. The support plate is fixedly connected to the outer wall of the housing. A pressing plate is slidably connected to the outer wall of the support plate, and a limiting plate is fixedly connected to the lower surface of the pressing plate.

[0007] As a further description of the above technical solution: The support plate and the extrusion plate are connected by a snap-fit ​​at the ends away from the outer shell.

[0008] As a further description of the above technical solution: The elastic card block is slidably connected to the inner wall of the sealing block, and the elastic card block is shaped like an arrow.

[0009] As a further description of the above technical solution: The inner wall of the outer casing has a placement groove, through which the bolt is threaded and connected to the inner wall of the placement groove.

[0010] As a further description of the above technical solution: The limiting plate is wavy in shape, and the support plate is L-shaped.

[0011] As a further description of the above technical solution: The anti-sway assembly is provided in two sets, and the two sets of anti-sway assemblies are symmetrically arranged with the center line of the outer shell as the axis of symmetry.

[0012] As a further description of the above technical solution: The cover plate is provided in two sets, and the two sets of cover plates are symmetrically arranged with the center line of the outer shell as the axis of symmetry.

[0013] This utility model has the following beneficial effects: 1. In this utility model, the cover plate of the dustproof component is fastened to drive the sealing block to seal the placement groove. The elastic locking block realizes the stable fixation of the sealing block. The compression pad enhances the sealing effect and effectively blocks the intrusion path of impurities. At the same time, the compression pad can reduce the situation of bolts loosening and spinning off when shaking, reduce the impact on insulation performance, reduce the probability of failure, and extend the service life of the molded case circuit breaker.

[0014] 2. In this utility model, the anti-sway components are symmetrically arranged, with an L-shaped support plate supporting the wire, a sliding extrusion plate driving a wave-shaped limiting plate to clamp the wire, and then the extrusion plate and the support plate are fixed by a buckle, which effectively restricts the swaying of the wire, avoids loose wiring, reduces safety risks, and significantly improves wiring stability and safety of use. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the overall device in this utility model; Figure 2This is a three-dimensional structural diagram of the fastening and dustproof component in this utility model; Figure 3 This is a three-dimensional cross-sectional view of the outer shell of this utility model; Figure 4 This is a three-dimensional structural disassembly diagram of the dustproof fastening component in this utility model.

[0016] Legend: 1. Outer shell; 2. Mounting slot; 3. Wiring frame; 4. Pressure plate; 5. Bolt; 6. Fastening dustproof assembly; 61. Cover plate; 62. Sealing block; 63. Extrusion pad; 64. Pressing block; 65. Elastic locking block; 66. Spring; 7. Anti-sway assembly; 71. Support plate; 72. Extrusion plate; 73. Limiting plate; 8. Placement slot. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Reference Figure 1 , Figure 2 and Figure 3 This utility model provides an embodiment of a molded case circuit breaker with a terminal block anti-sway structure, comprising an outer shell 1 serving as the circuit breaker housing. The inner wall of the outer shell 1 has a mounting groove 2 for wiring. A terminal frame 3 is fixedly connected to the inner wall of the mounting groove 2. A pressure plate 4 is slidably connected to the inner wall of the terminal frame 3. The connected wires are pressed and fixed inside the terminal frame 3 by the pressure plate 4. A bolt 5 is rotatably connected to the top of the pressure plate 4 for moving and pressing the pressure plate 4. The outer wall of the outer shell 1 is provided with a fastening anti-sway mechanism, which includes a fastening dustproof component 6. The fastening dustproof component 6 includes a cover plate 61 for moving a sealing block 62 above a placement groove 8. Hinged to the outer wall of the outer casing 1, the inner wall of the cover plate 61 is slidably connected to a sealing block 62 for sealing the placement groove 8 to prevent dust after wiring is completed. One end of the sealing block 62 is fixedly connected to a compression pad 63. When the compression pad 63 is pressed down, it adheres to the upper surface of the bolt 5 to prevent the bolt 5 from rotating and falling off when it shakes. The other end of the sealing block 62 is slidably connected to a pressing block 64 for driving the elastic locking block 65 to disengage from the inner wall of the placement groove 8. The bottom of the pressing block 64 is fixedly connected to the elastic locking block 65. The elastic locking block 65 can make the sealing block 62 stably locked inside the placement groove 8. The pressing block 64 and the sealing block 62 are elastically connected by a spring 66. The spring 66 keeps the elastic locking block 65 in a fixed state.

[0019] Reference Figure 2 and Figure 3 The fastening and anti-sway mechanism includes an anti-sway component 7 for preventing the wiring from swaying. The anti-sway component 7 includes a support plate 71 for supporting and lifting the wiring. The support plate 71 is fixedly connected to the outer wall of the outer shell 1 and is supported and fixed by the outer shell 1. The outer wall of the support plate 71 is slidably connected to a pressing plate 72 for pressing and fixing a limiting plate 73. The lower surface of the pressing plate 72 is fixedly connected to a limiting plate 73 for cooperating with the support plate 71 to fix the wiring. The end of the support plate 71 and the pressing plate 72 away from the outer shell 1 is snapped together, so that the support plate 71 and the limiting plate 73 press and fix the wiring. The limiting plate 73 is wavy in shape to clamp multiple strands of wiring. The support plate 71 is L-shaped to connect the limiting plate 73. Two sets of anti-sway components 7 are provided. The two sets of anti-sway components 7 are symmetrically arranged with the center line of the outer shell 1 as the axis of symmetry to support the wiring on both sides.

[0020] Reference Figure 2 , Figure 3 and Figure 4 The elastic locking block 65 is slidably connected to the inner wall of the sealing block 62. The elastic locking block 65 is arrow-shaped and abuts against the inner wall of the placement groove 8 to keep the sealing block 62 fixed. The inner wall of the outer shell 1 is provided with a placement groove 8 for rotating the bolt 5. The bolt 5 passes through and is threadedly connected to the inner wall of the placement groove 8. When rotated, it pushes the pressure plate 4. There are two sets of cover plates 61. The two sets of cover plates 61 are symmetrically arranged with the center line of the outer shell 1 as the axis of symmetry, and close the placement grooves 8 on both sides of the outer shell 1.

[0021] Working principle: During use, the wire is inserted into the wiring frame 3. By rotating the bolt 5, the bolt 5 moves threadedly within the placement groove 8, pushing the pressure plate 4 to slide within the wiring frame 3, thereby squeezing and fixing the wire inside the wiring frame 3, achieving a reliable electrical connection. After wiring, a fastening and anti-sway mechanism prevents the wire from shaking and dust from entering. Specifically, the fastening and dustproof component 6 is hinged to the outer casing 1 via a cover plate 61. A sealing block 62 is slidably connected inside the cover plate 61. One end of the sealing block 62 has a compression pad 63, and the other end controls the elastic locking block 65 via a pressing block 64. When it is necessary to seal the placement groove 8, the cover plate 61 is closed, and the sealing block 62 moves above the placement groove 8 under the action of the cover plate 61. Pressing the pressing block 64 causes the elastic locking block 65 to retract and disengage from the inner wall of the placement groove 8, sealing the wire. After the blocking block 62 is inserted into the placement slot 8, the pressing block 64 is released. The elastic locking block 65 pops out under the action of the spring 66 and locks into the inner wall of the placement slot 8, thereby sealing the placement slot 8 and preventing dust from entering. At the same time, the compression pad 63 enhances the sealing effect. The anti-sway component 7 is fixed to the outer shell 1 by the support plate 71. The compression plate 72 is slidably connected to the support plate 71. A wave-shaped limiting plate 73 is fixed to the lower end of the compression plate 72. The wire is placed on the L-shaped support plate 71, and the compression plate 72 is slid to make the limiting plate 73 cooperate with the support plate 71. The wave-shaped structure clamps the wire, and the compression plate 72 is snapped into the support plate 71 by the buckle, thereby effectively preventing the wire from shaking during use and improving the stability and safety of the wiring. The two sets of anti-sway components 7 are symmetrically arranged, which further enhances the anti-sway effect.

[0022] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A molded case circuit breaker with a terminal block anti-sway structure, comprising a housing (1), characterized in that: The inner wall of the outer shell (1) is provided with an installation groove (2), and a wiring frame (3) is fixedly connected to the inner wall of the installation groove (2). A pressure plate (4) is slidably connected to the inner wall of the wiring frame (3). A bolt (5) is rotatably connected to the top of the pressure plate (4). The outer wall of the outer shell (1) is provided with a fastening and anti-sway mechanism, which includes a fastening and dustproof component (6). The fastening dustproof assembly (6) includes a cover plate (61) hinged to the outer wall of the outer shell (1). A sealing block (62) is slidably connected to the inner wall of the cover plate (61). A compression pad (63) is fixedly connected to one end of the sealing block (62). A pressing block (64) is slidably connected to the other end of the sealing block (62). An elastic locking block (65) is fixedly connected to the bottom of the pressing block (64). The pressing block (64) and the sealing block (62) are elastically connected by a spring (66).

2. A molded case circuit breaker with a terminal block anti-sway structure according to claim 1, characterized in that: The fastening and anti-sway mechanism includes an anti-sway component (7), which includes a support plate (71). The support plate (71) is fixedly connected to the outer wall of the outer shell (1). An extrusion plate (72) is slidably connected to the outer wall of the support plate (71), and a limiting plate (73) is fixedly connected to the lower surface of the extrusion plate (72).

3. A molded case circuit breaker with a terminal block anti-sway structure according to claim 2, characterized in that: The support plate (71) and the extrusion plate (72) are connected by a snap fastener at the end away from the outer shell (1).

4. A molded case circuit breaker with a terminal block anti-sway structure according to claim 1, characterized in that: The elastic block (65) is slidably connected to the inner wall of the sealing block (62), and the elastic block (65) is shaped like an arrow.

5. A molded case circuit breaker with a terminal block anti-sway structure according to claim 1, characterized in that: The inner wall of the outer shell (1) is provided with a placement groove (8), and the bolt (5) passes through and is threadedly connected to the inner wall of the placement groove (8).

6. A molded case circuit breaker with a terminal block anti-sway structure according to claim 2, characterized in that: The shape of the limiting plate (73) is wavy, and the shape of the support plate (71) is L-shaped.

7. A molded case circuit breaker with a terminal block anti-sway structure according to claim 2, characterized in that: The anti-sway assembly (7) is provided in two sets, and the two sets of anti-sway assemblies (7) are symmetrically arranged with the center line of the outer shell (1) as the axis of symmetry.

8. A molded case circuit breaker with a terminal block anti-sway structure according to claim 1, characterized in that: The cover plate (61) is provided in two sets, and the two sets of cover plates (61) are symmetrically arranged with the center line of the outer shell (1) as the axis of symmetry.

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