A circuit breaker capable of preventing misoperation

Abstract

The utility model discloses a circuit breaker of preventing misoperation relates to the technical field of moulded case circuit breaker, and this circuit breaker of preventing misoperation includes top shell, and the switch is cooperatively installed on the top shell, the switch is cooperatively installed below on the tripping device, the tripping device is equipped with connecting rod, and the top shell top is opened with the round hole, and is located one side at the switch, and the locking mechanism is cooperatively installed in the round hole, the utility model discloses when the switch is in the closing state, will key insert key lock, clockwise twist 180 degrees, and the axle core of key lock rotates, because the axle core is fixed with the threaded cap, and the threaded cap still is fixed with the cam piece through the screw, and the cam piece follows the rotation, and then the stirring axle on the cam piece is one stirring force to the arc groove, and the hook head of the driving plate front end is pulled to the connecting rod at this time, thereby forcing the tripping device to force tripping.

Description

Technical Field

[0001] This utility model specifically relates to the field of molded case circuit breaker technology, and more specifically to a circuit breaker that can prevent misoperation. Background Technology

[0002] Molded case circuit breakers are electrical protection devices widely used for circuit protection in low-voltage power distribution systems. Made of plastic, they are lightweight, corrosion-resistant, and have good insulation properties, providing mechanical protection and electrical insulation for internal components.

[0003] Traditional molded case circuit breakers, although they have a forced tripping mechanism, can be easily re-closed after tripping. Especially during electrical or equipment maintenance, after the circuit breaker is tripped, a designated person must hold it to prevent accidental re-closing. However, when working alone, it is impossible to prevent other personnel from accidentally closing the circuit breaker, which is extremely dangerous. Utility Model Content

[0004] The purpose of this utility model is to provide a circuit breaker that can prevent misoperation. By rotating the lock cylinder with a key, the drive plate is activated by the cam disc, and the hook locks and tightens the connecting rod. This prevents the switch from being forcibly closed, and the circuit breaker cannot be closed without the key, greatly improving the safety during electrical maintenance; thus solving the technical problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A circuit breaker capable of preventing misoperation includes a top housing on which a switch is mounted; a trip unit is mounted below the switch; and a connecting rod is provided on the trip unit.

[0007] A circular hole is provided on the top of the top shell, located on one side of the switch, and a locking mechanism is installed inside the circular hole.

[0008] The locking mechanism includes a key lock, the lower end of which extends through to the bottom of the drive plate, and the drive plate is slidably connected to the key lock; a cam plate for driving the drive plate is attached to the bottom of the drive plate, and the cam plate is fixedly connected to the shaft of the key lock.

[0009] The drive plate has an integral hook head at one end, and the hook head is engaged and fixed with the connecting rod.

[0010] As a further technical solution of this utility model, the drive plate is provided with a sliding groove that can slide along the key lock, and an arc-shaped groove is provided between the sliding groove and the hook head.

[0011] As a further technical solution of this utility model, the cam plate is sleeved on the bottom of the key lock and is fixedly connected to the threaded cap by screws; the threaded cap is fixedly connected to the shaft thread or screw of the key lock.

[0012] As a further technical solution of this utility model, the cam plate is provided with a toggle shaft, and the toggle shaft is inserted into the arc-shaped groove.

[0013] As a further technical solution of this utility model, the trip unit is fixed inside the bottom shell, and the bottom shell and the top shell are fixedly connected by screws.

[0014] The bottom shell and the top shell are also provided with wiring terminals at both ends; the wiring terminals are embedded in the bottom shell, and a wiring assembly is installed above each wiring terminal.

[0015] As a further technical solution of this utility model, the wiring assembly includes a U-shaped frame fixed to the top shell, and a countersunk bolt is threaded onto the U-shaped frame; a pressure plate is movably connected to the lower end of the countersunk bolt.

[0016] As a further technical solution of this utility model, an arc-extinguishing grid is provided on one side of the trip unit, and the outer side of the arc-extinguishing grid is provided on a partition plate integrally formed with the top shell, which serves as a space between the wiring assembly and the arc-extinguishing grid; the wiring terminal passes through the bottom of the partition plate.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. In this utility model, when the switch is in the closed state, the key is inserted into the key lock and rotated 180 degrees clockwise. The key lock's shaft rotates. Since the shaft is fixed to the threaded cap, and the threaded cap is also fixed to the cam plate by screws, the cam plate rotates accordingly. The actuating shaft on the cam plate exerts a actuating force on the arc groove. At this time, the hook at the front end of the drive plate pulls the connecting rod, thereby forcing the trip unit to trip.

[0019] 2. In this utility model, the hook at the front end of the drive board has a traction force on the connecting rod. When the key is pulled out, the drive board does not reset, and the switch cannot be forcibly closed at this time. Therefore, it has a good anti-closing protection effect and effectively avoids the occurrence of electrical damage. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0021] Figure 2 This utility model Figure 1 The main view.

[0022] Figure 3 This utility model Figure 1A partial structural diagram.

[0023] Figure 4 This utility model Figure 3 A schematic diagram of the bottom structure.

[0024] Figure 5 This utility model Figure 3 Top view.

[0025] Figure 6 This utility model Figure 5 AA sectional view.

[0026] Figure 7 This is a schematic diagram of the top shell structure in this utility model.

[0027] Figure 8 This utility model Figure 7 A schematic diagram of the bottom structure.

[0028] Figure 9 This utility model Figure 8 A schematic diagram of the split structure.

[0029] Figure 10 This utility model Figure 9 A magnified view of a portion of the image.

[0030] In the diagram: 1-bottom shell, 2-top shell, 3-locking mechanism, 4-switch, 5-wiring assembly, 6-terminal, 7-arc extinguishing grid, 8-trip device, 9-linkage rod;

[0031] 31-Key lock, 32-Drive plate, 33-Cam plate, 34-Threaded cap, 35-Arc groove, 36-Hook, 37-Slide groove;

[0032] 51-U-shaped frame, 52-countersunk bolt, 53-pressure plate. Detailed Implementation

[0033] 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.

[0034] Please see Figure 1-10 In this embodiment of the utility model, a circuit breaker that can prevent misoperation includes a top shell 2, on which a switch 4 is mounted; the switch 4 is mounted on a trip unit 8 below it; and the trip unit 8 is provided with a connecting rod 9.

[0035] A circular hole is provided on the top of the top shell 2, located on one side of the switch 4, and a locking mechanism 3 is installed in the circular hole.

[0036] The locking mechanism 3 includes a key lock 31, the lower end of which extends through to the bottom of the drive plate 32, and the drive plate 32 is slidably connected to the key lock 31; a cam plate 33 for driving the drive plate 32 is attached to the bottom of the drive plate 32, and the cam plate 33 is fixedly connected to the shaft of the key lock 31.

[0037] The drive plate 32 has a hook head 36 integrally provided at one end, and the hook head 36 is engaged and fixed with the connecting rod 9.

[0038] In this embodiment, the drive plate 32 is provided with a sliding groove 37 that can slide along the key lock 31, and an arc groove 35 is provided between the sliding groove 37 and the hook head 36.

[0039] More specifically, the cam plate 33 is sleeved on the bottom of the key lock 31 and is fixedly connected to the threaded cap 34 by screws; the threaded cap 34 is fixedly connected to the shaft core of the key lock 31 by threads or screws. The cam plate 33 is provided with an actuating shaft, and the actuating shaft is inserted into the arc-shaped groove 35.

[0040] By adopting the above technical solution, when the switch 4 is in the closed state, the key is inserted into the key lock 31 and rotated 180 degrees clockwise. The shaft of the key lock 31 rotates. Since the shaft is fixed to the threaded cap 34 and the threaded cap 34 is also fixed to the cam plate 33 by screws, the cam plate 33 rotates accordingly. The actuating shaft on the cam plate 33 exerts a actuating force on the arc groove 35. At this time, the hook 36 at the front end of the drive plate 32 pulls the connecting rod 9, thereby forcing the trip unit 8 to trip.

[0041] In this situation, the hook 36 at the front end of the drive board 32 exerts a traction force on the connecting rod 9. When the key is pulled out, the drive board 32 does not reset, and the switch 4 cannot be forcibly closed at this time. Therefore, it has a good anti-closing protection effect and effectively avoids the occurrence of electrical damage.

[0042] In this embodiment, the trip unit 8 is fixed inside the bottom shell 1, and the bottom shell 1 and the top shell 2 are fixedly connected by screws.

[0043] As a further explanation of this embodiment, molded case circuit breakers are a mature existing technology. This utility model is an improvement on the conventional molded case circuit breaker technology with a key lock. Therefore, existing technologies such as arc extinguishing grids, trip units, and connecting rods will only be explained here, and their specific principles will not be elaborated.

[0044] Note: The arc-extinguishing grid is usually located in the arc-extinguishing chamber of a molded case circuit breaker, near the moving and stationary contacts. When the circuit breaker breaks the circuit, the electric arc generated between the moving and stationary contacts is directed to the arc-extinguishing grid. The arc-extinguishing grid is generally composed of multiple metal grid plates, which are arranged parallel to each other and spaced apart, and are installed at an angle on the arc-blocking plate. The extension line of the grid plate surface passes through the rotation center of the circuit breaker's drive mechanism.

[0045] Arc-extinguishing grids are typically installed between the upper and lower shells of the arc-extinguishing chamber and fixed to the arc-isolating plate using slots, grooves, or screws. For example, in some molded case circuit breakers, the arc-extinguishing grids are inserted into pre-set slots inside the arc-extinguishing chamber shell and then secured with clips or screws at both ends to ensure their stable position and effective arc extinguishing when the circuit breaker breaks and generates an arc.

[0046] Arrangement and Installation of Trip Units: The trip unit is one of the core components of a molded case circuit breaker, used to disconnect the circuit when faults such as overload or short circuit occur. It is usually installed inside the circuit breaker, working in conjunction with components such as the operating mechanism and contact system. In a thermal-magnetic trip unit, the thermal element and bimetallic strip are connected in series with the main circuit to detect overload current; the electromagnet in the magnetic trip unit is used to detect short-circuit current.

[0047] Trip Unit Mounting Link: The installation method of the trip unit and the link usually varies depending on the specific structure and design of the circuit breaker. Generally, the trip unit has specific connection points or mounting holes for connecting to the link. One end of the link is connected to the trip unit, usually through a pivot, pin, or hook, so that the trip unit can drive the link when it actuates. The other end is connected to the circuit breaker's operating mechanism or traction rod. For example, in some molded case circuit breakers, the trip unit is connected to a lever in the operating mechanism via one or more links. When the trip unit is triggered, the link pushes the lever to rotate, thereby actuating the operating mechanism and tripping the circuit breaker.

[0048] Using a forced trip button for tripping: The forced trip button for molded case circuit breakers is usually installed on the circuit breaker casing, allowing operators to manually trigger the tripping action when needed. Its working principle is as follows: When the forced trip button is pressed, the button acts directly on the trip unit's linkage or tripping mechanism via a mechanical transmission device (such as a push rod or lever). This causes the trip unit to overcome the spring resistance, generating a force that actuates the tripping mechanism, thus triggering the trip unit to operate. After the trip unit actuates, it drives the operating mechanism via the linkage, separating the moving contact from the stationary contact of the circuit breaker, cutting off the circuit, and achieving forced tripping.

[0049] The bottom shell 1 and the top shell 2 are also provided with wiring terminals 6 at both ends; the wiring terminals 6 are embedded in the bottom shell 1, and a wiring assembly 5 is installed above each wiring terminal 6.

[0050] More specifically, the wiring assembly 5 includes a U-shaped frame 51 fixed to the top shell 2, and a countersunk bolt 52 is threaded onto the U-shaped frame 51; a pressure plate 53 is movably connected to the lower end of the countersunk bolt 52.

[0051] By adopting the above technical solution, when wiring, the wire core is placed above the terminal 6, and then the countersunk screw 52 is rotated so that the pressure plate 53 presses the wire core onto the terminal 6, thereby completing the wiring work; the pressure plate 53 is set in an arc shape, which can prevent the wire core from shifting.

[0052] In this embodiment, an arc-extinguishing grid 7 is provided on one side of the trip unit 8, and the outer side of the arc-extinguishing grid 7 is provided on a partition plate integrally formed with the top shell 2 for spacing between the wiring assembly 5 and the arc-extinguishing grid 7; the wiring terminal 6 passes through the bottom of the partition plate.

[0053] By adopting the above technical solution, the partition can prevent the wire core from being excessively inserted during wiring, thus avoiding any impact on the arc-extinguishing grid.

[0054] The working principle of this utility model is as follows: When wiring, the wire core is placed above the terminal 6, and then the countersunk screw 52 is rotated so that the pressure plate 53 presses the wire core onto the terminal 6, thereby completing the wiring work; the pressure plate 53 is set in an arc shape, which can prevent the wire core from shifting.

[0055] When switch 4 is in the closed state, insert the key into key lock 31 and turn it clockwise 180 degrees. The shaft of key lock 31 rotates. Since the shaft is fixed to threaded cap 34 and threaded cap 34 is also fixed to cam plate 33 by screws, cam plate 33 rotates accordingly. The actuating shaft on cam plate 33 exerts a actuating force on arc groove 35. At this time, hook 36 at the front end of drive plate 32 pulls connecting rod 9, thereby forcing trip unit 8 to trip.

[0056] In this situation, the hook 36 at the front end of the drive board 32 exerts a traction force on the connecting rod 9. When the key is pulled out, the drive board 32 does not reset, and the switch 4 cannot be forcibly closed at this time. Therefore, it has a good anti-closing protection effect and effectively avoids the occurrence of electrical damage.

[0057] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0058] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A circuit breaker capable of preventing misoperation, characterized in that: Includes a top shell (2), on which a switch (4) is fitted; the switch (4) is fitted on a trip unit (8) below; the trip unit (8) is provided with a connecting rod (9); A circular hole is provided on the top of the top shell (2) and is located on one side of the switch (4). A locking mechanism (3) is installed in the circular hole. The locking mechanism (3) includes a key lock (31), the lower end of which extends through to the bottom of the drive plate (32), and the drive plate (32) is slidably connected to the key lock (31); a cam plate (33) for driving the drive plate (32) is attached to the bottom of the drive plate (32), and the cam plate (33) is fixedly connected to the shaft of the key lock (31); The drive plate (32) is integrally provided with a hook (36) at one end, and the hook (36) is engaged and fixed with the connecting rod (9).

2. The circuit breaker capable of preventing misoperation according to claim 1, characterized in that: The drive plate (32) is provided with a sliding groove (37) that can slide along the key lock (31), and an arc groove (35) is provided between the sliding groove (37) and the hook (36).

3. The circuit breaker capable of preventing misoperation according to claim 2, characterized in that: The cam plate (33) is sleeved on the bottom of the key lock (31) and fixedly connected to the threaded cap (34) by screws; the threaded cap (34) is fixedly connected to the shaft thread or screw of the key lock (31).

4. The circuit breaker capable of preventing misoperation according to claim 3, characterized in that: The cam plate (33) is provided with a toggle shaft, and the toggle shaft is inserted into the arc groove (35).

5. The circuit breaker capable of preventing misoperation according to claim 1, characterized in that: The trip unit (8) is fixed inside the bottom shell (1), and the bottom shell (1) and the top shell (2) are fixedly connected by screws; The bottom shell (1) and the top shell (2) are also provided with wiring terminals (6); the wiring terminals (6) are embedded in the bottom shell (1), and a wiring assembly (5) is installed above each wiring terminal (6).

6. The circuit breaker capable of preventing misoperation according to claim 5, characterized in that: The wiring assembly (5) includes a U-shaped frame (51) fixed to the top shell (2), and a countersunk bolt (52) is threaded onto the U-shaped frame (51); a pressure plate (53) is movably connected to the lower end of the countersunk bolt (52).

7. The circuit breaker capable of preventing misoperation according to claim 5, characterized in that: The trip unit (8) has an arc-extinguishing grid (7) on one side. The outer side of the arc-extinguishing grid (7) is provided on a partition that is integrally formed with the top shell (2) for spacing between the wiring assembly (5) and the arc-extinguishing grid (7); the wiring terminal (6) passes through the bottom of the partition.

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