A moulded case circuit breaker with stable wiring

Abstract

The utility model relates to the technical field of circuit breaker, concretely is a kind of plastic case circuit breaker of wiring stability, including circuit breaker shell;The utility model exerts down pressure to pressing plate by limiting bolt, make pressing plate move down on the inner wall of wiring end shell, then make pressing plate drive down pressure conical block to move down, further make down pressure conical block extrude wiring end head downwards, make wiring end head be fixed between conical groove and down pressure conical block, while down pressure conical block is clamped into the inner chamber of wiring end head, wiring is more stable;By the clamping plate drive slider moves up on the inner wall of limiting shell, while slider drive limiting spring is stretched, after wiring is installed, release pull rod, it will make limiting spring rebound reset, further make limiting spring down pull slider reset, to make the clamping plate press down to wiring, while clamping plate drive hard rubber block press down wiring, it will make wiring be fixed on the inner wall of hard rubber block.

Description

Technical Field

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

[0002] A molded case circuit breaker is an electrical device that combines manual on / off operation with automatic protection functions, enabling intelligent protection against undervoltage, overload, and short-circuit faults. This device is mainly used for power distribution and infrequent start-stop control of asynchronous motors. It can provide systematic protection for power lines, motors, and other loads. In the event of severe overload, short circuit, or undervoltage, it can automatically disconnect the faulty circuit. If the copper busbar or connection point of the circuit breaker is loose, corroded, or improperly installed, or if the wiring is unstable, it will lead to an increase in local resistance, generate high temperature, and cause the wiring to burn out. For example, the prior art represented by the molded case circuit breaker with stable wiring in the prior art document (publication number CN219696369U) uses a circuit breaker base, a housing that fits with the circuit breaker base, and a wiring part at the end of the circuit breaker. The base has a conductive plate, a slot for accommodating the conductive plate, a snap-fit ​​structure for fixing the connecting wire, and a guide groove that cooperates with the snap-fit ​​structure on the wiring part. The guide groove has a guide post. The snap-fit ​​structure includes a limiting plate and a connecting ear. The connecting ear is set in the guide groove and fitted with the guide post. The connecting ear has a through groove that cooperates with the guide post. This utility model circuit breaker features a snap-fit ​​structure at the wiring terminals to facilitate better crimping of the wires after connection, greatly improving the stability of the wire connection and effectively solving the problems of existing technologies. However, its structure still needs improvement, as follows:

[0003] In this design, a snap-fit ​​structure is provided on the wiring terminal to facilitate better crimping of the wires after connection. However, due to the small installation space at the circuit breaker's wiring terminal, there will be a large gap on both sides of the wiring after the limiting plate and wiring are fixed, which will lead to poor wiring fixation. Therefore, a molded case circuit breaker with stable wiring is needed to improve the above-mentioned problem. Utility Model Content

[0004] To address the issue that loose, corroded, or improperly installed copper busbars or connection points in molded case circuit breakers can lead to unstable wiring, resulting in increased local resistance, high temperatures, and ultimately, burnt-out wiring, this invention provides a molded case circuit breaker with stable wiring to solve the aforementioned problems.

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

[0006] A molded case circuit breaker with stable wiring includes a circuit breaker housing, an operating handle is embedded in the outer wall of the circuit breaker housing and one end of the operating handle is connected to an actuator, an actuating handle is installed on the outer wall of the circuit breaker housing, a stationary contact is installed on the inner wall of the circuit breaker housing, and an arc-extinguishing chamber is provided on the inner wall of the circuit breaker housing.

[0007] A wiring assembly is provided on the inner wall of the circuit breaker housing, an electromagnetic trip device is provided on the inner wall of the circuit breaker housing, and a pressure-down assembly is installed on one side of the wiring assembly and on the outer wall of the circuit breaker housing.

[0008] The wiring assembly includes a terminal housing, and multiple sets of terminal housings are provided and located on opposite outer walls of the circuit breaker housing. A limit block is embedded in the inner wall of the terminal housing.

[0009] As a preferred embodiment of this utility model, a pressure plate is slidably connected to the inner wall of the terminal housing, wherein the cross-section of the pressure plate is L-shaped, and a limit bolt is threadedly connected to the outer wall of the terminal housing directly above the pressure plate.

[0010] As a preferred embodiment of this utility model, one end of the limiting bolt is connected to a pressure plate, and a base is embedded in the inner wall of the terminal housing directly below the pressure plate.

[0011] As a preferred embodiment of this utility model, a conical groove is provided on the outer wall of the base, and a downward pressing conical block is installed directly above the conical groove and on the bottom outer wall of the pressure plate.

[0012] As a preferred embodiment of this utility model, the pressing component includes a limiting housing, and two sets of the limiting housing are provided and located on the outer wall of the circuit breaker housing respectively. A slider is slidably connected to the inner wall of the limiting housing.

[0013] As a preferred embodiment of this utility model, a clamping plate is installed on the side wall of the slider, and one end of the clamping plate is slidably connected to the inner wall of the terminal housing. The slider is provided in two sets and is located on the opposite side walls of the clamping plate.

[0014] As a preferred embodiment of this utility model, a limiting rod is installed on the inner wall opposite to the limiting shell, and a slider is slidably connected to the outer wall of the limiting rod.

[0015] As a preferred embodiment of this utility model, a limiting spring is installed on the bottom outer wall of the slider, wherein one end of the limiting spring is connected to the inner wall of the limiting housing, a pull rod is installed on the outer wall of the slider, wherein the cross-section of the clamping plate is an arc-shaped structure, and a hard rubber block structure is provided at the bottom of the clamping plate.

[0016] Compared with existing technologies, this utility model can fix the terminals by setting a wiring assembly in a molded case circuit breaker with stable wiring. The limiting bolt applies downward pressure to the pressure plate, causing the pressure plate to move downward on the inner wall of the terminal housing. Subsequently, the pressure plate drives the downward pressing cone block to move downward, which in turn presses the terminal head downward, so that the terminal head is locked between the cone groove and the downward pressing cone block for fixation. At the same time, the downward pressing cone block is locked into the inner cavity of the terminal head, making the wiring more stable. This solves the problem that if the copper busbar or connection point of the circuit breaker is loose, corroded, or improperly installed, the wiring will be unstable, which will lead to increased local resistance, high temperature, and thus burn out the wiring.

[0017] This invention achieves stable fixing of the wiring by setting a pressing component in a molded case circuit breaker with stable wiring. The clamping plate drives the slider to move upward on the inner wall of the limiting housing. At the same time, the slider drives the limiting spring to stretch. After the wiring is installed, releasing the pull rod will cause the limiting spring to rebound and reset, which in turn pulls the slider down to reset, so that the clamping plate presses down on the wiring. Simultaneously, the clamping plate drives the hard rubber block to press down on the wiring, which will fix the wiring in place on the inner wall of the hard rubber block. This solves the problem that the installation space of the circuit breaker wiring terminals is small, and after the limiting plate and wiring are fixed, there will be large gaps on both sides of the wiring, which will lead to poor wiring fixation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the internal cavity structure of the circuit breaker housing according to this utility model;

[0020] Figure 3 This is a schematic diagram of the right-side structure of this utility model;

[0021] Figure 4 This utility model Figure 2 Enlarged schematic diagram of the structure at point B;

[0022] Figure 5 This utility model Figure 2 An enlarged schematic diagram of the structure at point A.

[0023] In the diagram: 1. Circuit breaker housing; 2. Operating handle; 3. Actuator; 4. Operating handle; 5. Stationary contact; 6. Arc extinguishing chamber; 7. Wiring assembly; 701. Terminal housing; 702. Limiting block; 703. Pressure plate; 704. Limiting bolt; 705. Base; 706. Conical groove; 707. Lowering conical block; 8. Electromagnetic trip unit; 9. Lowering assembly; 901. Limiting housing; 902. Slider; 903. Clamping plate; 904. Limiting rod; 905. Limiting spring; 906. Pull rod. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0025] Example: Please refer to Figure 1-5 The circuit breaker shown is a molded case circuit breaker with stable wiring, including a circuit breaker housing 1, an operating handle 2 embedded in the outer wall of the circuit breaker housing 1, and an actuator 3 connected to one end of the operating handle 2, an actuating handle 4 installed on the outer wall of the circuit breaker housing 1, a stationary contact 5 installed on the inner wall of the circuit breaker housing 1, and an arc extinguishing chamber 6 provided on the inner wall of the circuit breaker housing 1.

[0026] A wiring assembly 7 is provided on the inner wall of the circuit breaker housing 1, an electromagnetic trip device 8 is provided on the inner wall of the circuit breaker housing 1, and a pressure assembly 9 is installed on one side of the wiring assembly 7 and on the outer wall of the circuit breaker housing 1.

[0027] In this embodiment, specific references Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The wiring assembly 7 includes a terminal housing 701. Multiple sets of terminal housings 701 are provided and are respectively located on the opposite outer walls of the circuit breaker housing 1. A limit block 702 is embedded in the inner wall of the terminal housing 701. A pressure plate 703 is slidably connected to the inner wall of the terminal housing 701. The pressure plate 703 has an L-shaped cross-section. A limit bolt 704 is threadedly connected to the pressure plate 703 on the outer wall of the terminal housing 701. One end of the limit bolt 704 is connected to the pressure plate 703. A base 705 is embedded in the pressure plate 703 on the inner wall of the terminal housing 701. A conical groove 706 is opened on the outer wall of the base 705. A downward pressing conical block 707 is installed on the bottom outer wall of the pressure plate 703 on the upper part of the conical groove 706.

[0028] In this embodiment, specific references Figure 1 , Figure 2 , Figure 3 and Figure 4The pressing assembly 9 includes a limiting housing 901. Two sets of limiting housings 901 are provided and are respectively located on the outer wall of the circuit breaker housing 1. A slider 902 is slidably connected to the inner wall of the limiting housing 901. A clamping plate 903 is installed on the side wall of the slider 902, and one end of the clamping plate 903 is slidably connected to the inner wall of the terminal housing 701. Two sets of sliders 902 are provided and are respectively located on the opposite side walls of the clamping plate 903. A limiting rod 904 is installed on the opposite inner wall of the limiting housing 901, and a slider 902 is slidably connected to the outer wall of the limiting rod 904. A limiting spring 905 is installed on the bottom outer wall of the slider 902, and one end of the limiting spring 905 is connected to the inner wall of the limiting housing 901. A pull rod 906 is installed on the outer wall of the slider 902. The clamping plate 903 has an arc-shaped cross-section, and a hard rubber block structure is provided at the bottom of the clamping plate 903.

[0029] In this scheme, the molded case circuit breaker with stable wiring operates by inserting the circular terminal of the wiring into the inner wall of the terminal housing 701. The limiting block 702 limits the terminal, positioning it directly above the tapered groove 706. Then, the limiting bolt 704 is tightened, causing its threads to move downwards on the inner wall of the terminal housing 701. This applies downward pressure to the pressure plate 703, causing the pressure plate 703 to press against the inner wall of the terminal housing 701. The pressure plate 703 then moves the downward pressure cone block 707 downward, causing the downward pressure cone block 707 to press the terminal downward, thus fixing the terminal between the cone groove 706 and the downward pressure cone block 707. At the same time, the downward pressure cone block 707 is locked into the inner cavity of the terminal, making the wiring more stable. This solves the problem that if the circuit breaker's copper busbar or connection point is loose, corroded, or improperly installed, the unstable wiring can lead to increased local resistance, high temperature, and ultimately burnout of the wiring.

[0030] Pulling up the lever 906 causes the clamping plate 903 to move upwards, which in turn causes the slider 902 to move upwards on the inner wall of the limiting housing 901. Simultaneously, the slider 902 stretches the limiting spring 905. After the wiring is installed, releasing the lever 906 causes the limiting spring 905 to spring back to its original position, which in turn pulls the slider 902 down to reset it. This causes the clamping plate 903 to press down on the wiring, and the clamping plate 903, in turn, causes the hard rubber block to press down on the wiring, securing the wiring to the inner wall of the hard rubber block. This solves the problem of limited installation space at the circuit breaker terminals and large gaps on both sides of the wiring after the limiting plate and wiring are fixed, leading to poor wiring fixation.

[0031] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art and are also general components, which are common knowledge in this field.

[0032] 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 with stable wiring, comprising a circuit breaker housing (1), characterized in that: An operating handle (2) is embedded in the outer wall of the circuit breaker housing (1), and one end of the operating handle (2) is connected to an actuator (3). An actuating handle (4) is installed on the outer wall of the circuit breaker housing (1). A stationary contact (5) is installed on the inner wall of the circuit breaker housing (1). An arc-extinguishing chamber (6) is provided on the inner wall of the circuit breaker housing (1). A wiring assembly (7) is provided on the inner wall of the circuit breaker housing (1), an electromagnetic trip unit (8) is provided on the inner wall of the circuit breaker housing (1), and a pressure assembly (9) is installed on one side of the wiring assembly (7) and on the outer wall of the circuit breaker housing (1). The wiring assembly (7) includes a terminal housing (701), which is provided in multiple sets and located on the opposite outer walls of the circuit breaker housing (1). A limit block (702) is embedded in the inner wall of the terminal housing (701).

2. A molded case circuit breaker with stable wiring according to claim 1, characterized in that: A pressure plate (703) is slidably connected to the inner wall of the terminal housing (701), wherein the cross-section of the pressure plate (703) is L-shaped, and a limit bolt (704) is threadedly connected to the outer wall of the terminal housing (701) directly above the pressure plate (703).

3. A molded case circuit breaker with stable wiring according to claim 2, characterized in that: One end of the limiting bolt (704) is connected to a pressure plate (703), and a base (705) is embedded in the pressure plate (703) and located on the inner wall of the terminal housing (701).

4. A molded case circuit breaker with stable wiring according to claim 3, characterized in that: A tapered groove (706) is provided on the outer wall of the base (705), and a pressing tapered block (707) is installed directly above the tapered groove (706) and on the bottom outer wall of the pressure plate (703).

5. A molded case circuit breaker with stable wiring according to claim 4, characterized in that: The pressure-down assembly (9) includes a limiting housing (901), which has two sets located on the outer wall of the circuit breaker housing (1), and a slider (902) is slidably connected to the inner wall of the limiting housing (901).

6. A molded case circuit breaker with stable wiring according to claim 5, characterized in that: The slider (902) is equipped with a clamping plate (903) on its side wall, and one end of the clamping plate (903) is slidably connected to the inner wall of the terminal housing (701). The slider (902) is provided in two sets and is located on the opposite side walls of the clamping plate (903).

7. A molded case circuit breaker with stable wiring according to claim 6, characterized in that: A limiting rod (904) is installed on the inner wall opposite to the limiting housing (901), and a slider (902) is slidably connected to the outer wall of the limiting rod (904).

8. A molded case circuit breaker with stable wiring according to claim 7, characterized in that: A limiting spring (905) is installed on the bottom outer wall of the slider (902), one end of which is connected to the inner wall of the limiting housing (901). A pull rod (906) is installed on the outer wall of the slider (902). The cross-section of the clamping plate (903) is arc-shaped, and a hard rubber block structure is provided at the bottom of the clamping plate (903).

Images