A molded case circuit breaker

Abstract

The utility model discloses a kind of moulded case circuit breakers, including circuit breaker main body, wiring hole being opened on circuit breaker main body and wiring terminal being set in the inside of circuit breaker main body, through hole is passed through and is opened on wiring terminal, the outside of wiring terminal is equipped with connecting frame, the top of connecting frame is equipped with threaded hole, screw is threadedly connected in the inside of threaded hole, the bottom of screw is sequentially equipped with vertical rod and carousel from top to bottom, the inside of connecting frame is slidably installed with pressing plate, the bottom of pressing plate is fixedly connected with plug rod, the outside of plug rod is symmetrically equipped with spring piece, the utility model is fixed by the plug rod and spring piece being set and can be pre-fixed to copper nose or copper bar, so that when fixing it, it is not necessary to hold by hand, effectively improve the convenience of operation, and by the pressing plate, vertical rod, carousel, vertical hole and rotation groove being set, when screw is loosened, screw cannot be separated from connecting frame, avoid the problem of screw drop, further optimize the convenience of operation.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to a molded case circuit breaker. Background Technology

[0002] Molded case circuit breakers are a common protective electrical appliance in low-voltage power distribution systems. They are named for their core components being sealed within a thermosetting plastic casing. They are mainly used to distribute electrical energy and protect circuits and electrical equipment from damage caused by overloads, short circuits, undervoltage, and other faults. They are widely used in power distribution systems in industrial, commercial, and civil buildings.

[0003] Because existing molded case circuit breakers have a large rated current, their terminals are usually connected to copper lugs or copper busbars to ensure good contact. When wiring, the screws on the terminals need to be removed, and then the holes of the copper lugs or copper busbars need to be aligned with the holes on the terminals. Then the screws need to be screwed into the holes to secure them. During this process, one hand needs to hold the copper lugs or copper busbars to align them with the holes on the terminals, while the other hand tightens the screws. During the tightening process, the screws may fall out, making the operation very inconvenient. Utility Model Content

[0004] The purpose of this invention is to provide a molded case circuit breaker to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a molded case circuit breaker, comprising a circuit breaker body, wiring holes formed on the circuit breaker body, and wiring terminals disposed inside the circuit breaker body. A through hole is formed through the wiring terminal, and a connecting frame is provided on the outer side of the wiring terminal. A threaded hole is formed at the top of the connecting frame, and a screw is threaded into the threaded hole. A vertical rod and a turntable are arranged sequentially from top to bottom at the bottom of the screw. A pressure plate is slidably mounted on the inner side of the connecting frame, and a plug rod is fixedly connected to the bottom of the pressure plate. Spring pieces are symmetrically arranged on the outer side of the plug rod. A vertical hole that mates with the vertical rod is formed at the top of the pressure plate, and a rotating groove for accommodating the rotation of the turntable is provided inside the pressure plate.

[0006] In a preferred embodiment of this utility model, the rotating groove is connected to the vertical hole, the diameter of the turntable is larger than the diameter of the vertical hole, and the diameter of the turntable is larger than the diameter of the vertical rod.

[0007] As a preferred embodiment of this utility model, the bottom edge of the insertion rod is chamfered.

[0008] As a preferred embodiment of this utility model, the screw, the vertical rod, and the turntable are integrally formed.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model can pre-fix the copper lug or copper busbar by setting the insert rod and spring piece, so that there is no need to support it by hand when fixing it, which effectively improves the convenience of operation. In addition, the setting of pressure plate, vertical rod, turntable, vertical hole and rotating groove ensures that the screw will not separate from the connecting frame when loosening the screw, avoiding the problem of screw falling off, further optimizing the convenience of operation. Furthermore, the copper lug or copper busbar is pressed by pressure plate, which has a larger contact area and better fixing effect compared with the traditional method of directly pressing with screw. Attached Figure Description

[0010] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0011] Figure 2 This is a schematic diagram of the structure of this utility model after the screws are tightened;

[0012] Figure 3 This is a schematic diagram of the structure of the terminal block of this utility model;

[0013] Figure 4 This utility model Figure 3 Exploded view;

[0014] Figure 5 This utility model Figure 3 Cross-sectional view.

[0015] In the diagram: 1. Circuit breaker body; 2. Terminal block; 3. Screw; 4. Through hole; 5. Pressure plate; 6. Connecting frame; 7. Insert rod; 8. Spring; 9. Rotary groove; 10. Chamfer; 11. Vertical rod; 12. Turntable; 13. Vertical hole; 14. Threaded hole; 15. Wiring hole. Detailed Implementation

[0016] 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.

[0017] Please see Figures 1 to 5This utility model provides a technical solution: a molded case circuit breaker, including a circuit breaker body 1, a wiring hole 15 on the circuit breaker body 1, the wiring hole 15 facilitating the use of a screwdriver to tighten a screw 3, and a wiring terminal 2 disposed inside the circuit breaker body 1. A through hole 4 is provided through the wiring terminal 2, and a connecting frame 6 is provided on the outer side of the wiring terminal 2. A threaded hole 14 is provided on the top of the connecting frame 6, and a screw 3 is threadedly connected inside the threaded hole 14. When the screw 3 is tightened, the screw 3 drives the pressure plate 5 to move via a turntable 12, causing the pressure plate 5 to press against the copper lug or copper busbar. A vertical rod 11 and a turntable 12 are sequentially arranged at the bottom of the screw 3 from top to bottom. The pressure plate 5 is slidably installed on the inner side of the connecting frame 6. The pressure plate 5 is used to press against the copper lug or copper busbar, increasing the contact area and providing a better fixing effect compared to directly pressing with a screw 3. A plug rod 7 is fixedly connected to the bottom of the pressure plate 5, and the plug rod 7 passes through the copper lug or copper busbar. After insertion, insert it into the through hole 4 to ensure a firm connection. The outer side of the insertion rod 7 is symmetrically provided with spring pieces 8. The spring pieces 8 are inclined. When the copper lug or copper busbar is sleeved on the outer side of the insertion rod 7, the spring pieces 8 will be compressed first. After the copper lug or copper busbar passes through the spring pieces 8, the spring pieces 8 will spring open to block and prevent the copper lug or copper busbar from separating from the insertion rod 7, which plays a pre-fixing role and facilitates subsequent fixing. The top of the pressure plate 5 is provided with a vertical hole 13 that cooperates with the vertical rod 11. The vertical rod 11 is rotatably installed in the vertical hole 13. When the screw 3 is turned, it will drive the vertical rod 11 and the turntable 12 to rotate. The vertical rod 11 rotates in the vertical hole 13, and the turntable 12 rotates in the rotating groove 9. Since the pressure plate 5 is limited by the connecting frame 6 and cannot rotate, the screw 3 cannot drive the pressure plate 5 to rotate. The screw 3 can only drive the pressure plate 5 to move longitudinally along the inner side of the connecting frame 6. The inside of the pressure plate 5 is provided with a rotating groove 9 to accommodate the rotation of the turntable 12.

[0018] The rotating groove 9 is connected to the vertical hole 13. The diameter of the turntable 12 is larger than the diameter of the vertical hole 13, so that the turntable 12 cannot pass through the vertical hole 13, thus preventing the screw 3 from separating from the pressure plate 5. This allows the screw 3 to drive the pressure plate 5 to move. Since the screw 3 cannot separate from the pressure plate 5, when the screw 3 is screwed out to a certain extent, the pressure plate 5 will be blocked by the connecting frame 6, thereby restricting the screw 3 from being screwed out further. This prevents the screw 3 from separating from the connecting frame 6. The diameter of the turntable 12 is larger than the diameter of the vertical rod 11.

[0019] The bottom edge of the insertion rod 7 is chamfered 10, which is used to guide the insertion rod 7 so that it is easier to insert the insertion rod 7 into the hole of the copper lug or copper busbar.

[0020] Among them, screw 3, vertical rod 11 and turntable 12 are integrally molded structures. The integral molding structure facilitates production and manufacturing, and also ensures that the three have sufficient connection strength.

[0021] Specifically, during connection, use a screwdriver to turn screw 3 upwards. Screw 3 drives pressure plate 5 upwards via turntable 12, and pressure plate 5 drives plug rod 7 upwards until pressure plate 5 is blocked by connecting frame 6. At this point, plug rod 7 is exposed. Then, the copper lug or copper busbar to be connected is fitted onto the outside of plug rod 7. During the fitting process, spring 8 is compressed first. When the copper lug or copper busbar passes through spring 8, spring 8 springs open to block and prevent the copper lug or copper busbar from separating from plug rod 7. At this time, there is no need to support the copper lug or copper busbar by hand. Finally, turn screw 3 downwards. Screw 3 causes pressure plate 5 and plug rod 7 to move downwards. Pressure plate 5 presses the copper lug or copper busbar tightly, and plug rod 7 will also be inserted into through hole 4. Tighten screw 3 to ensure that the copper lug or copper busbar is firmly connected to terminal 2.

[0022] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0023] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A molded case circuit breaker, comprising a circuit breaker body (1), a wiring hole (15) formed on the circuit breaker body (1), and a wiring terminal (2) disposed inside the circuit breaker body (1), wherein a through hole (4) is formed through the wiring terminal (2), characterized in that: The outer side of the terminal block (2) is provided with a connecting frame (6), the top of the connecting frame (6) is provided with a threaded hole (14), the inside of the threaded hole (14) is connected with a screw (3), the bottom of the screw (3) is provided with a vertical rod (11) and a turntable (12) from top to bottom, a pressure plate (5) is slidably installed on the inner side of the connecting frame (6), the bottom of the pressure plate (5) is fixedly connected with a plug rod (7), the outside of the plug rod (7) is symmetrically provided with spring pieces (8), the top of the pressure plate (5) is provided with a vertical hole (13) that cooperates with the vertical rod (11), and the inside of the pressure plate (5) is provided with a rotating groove (9) for accommodating the rotation of the turntable (12).

2. A molded case circuit breaker according to claim 1, characterized in that: The rotating groove (9) is connected to the vertical hole (13), the diameter of the turntable (12) is larger than the diameter of the vertical hole (13), and the diameter of the turntable (12) is larger than the diameter of the vertical rod (11).

3. A molded case circuit breaker according to claim 1, characterized in that: The bottom edge of the insertion rod (7) is chamfered (10).

4. A molded case circuit breaker according to claim 1, characterized in that: The screw (3), the vertical rod (11), and the turntable (12) are integrally formed.

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