Direct-current miniature circuit breaker with high insulativity

Abstract

The utility model provides a direct current miniature circuit breaker with high insulativity, which comprises a circuit breaker body, a circuit breaker shell of the circuit breaker body comprises a shell main body positioned in the middle and terminal shells positioned at two ends of the shell main body, and a switch is mounted on the front side of the shell main body; the terminal shell is internally provided with an electrified terminal, one side, far away from the shell main body, of the terminal shell is provided with an insulating structure, the terminal shell is provided with an insulating protective cover, and the insulating protective cover covers the electrified terminal and the front end surface of the insulating structure at the same time. According to the utility model, by increasing the thickness of the terminal shell, the creepage distance between the electrified terminals of the direct current miniature circuit breaker can be effectively increased, a larger insulation distance is provided for the phases of the direct current circuit breaker, the safety performance of the product is more excellent, and the insulation reliability of the direct current miniature circuit breaker is further improved by providing the insulation protective cover.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to a high-insulation DC miniature circuit breaker. Background Technology

[0002] With the global energy transition and the increasing application of clean energy sources such as solar and wind power, the demand for grid-connected renewable energy generation is constantly growing. Simultaneously, the rapid development of new infrastructure sectors such as data centers, charging facilities, and rail transit is also driving up the demand for DC miniature circuit breakers (MBBs). In electric vehicle charging stations, DC MBBs prevent abnormal current from impacting charging equipment and vehicles; they are also beginning to be used in smart home power distribution systems to meet the needs of intelligent development. Miniature circuit breakers are used in low-voltage power distribution systems, installed at the circuit terminals, and are used for power distribution and protection of relevant circuits and electrical equipment.

[0003] Due to factors such as voltage characteristics, arc extinguishing requirements, and polarity effects, DC miniature circuit breakers have higher insulation performance requirements than AC circuit breakers. Currently, most DC miniature circuit breakers on the market have insulation schemes that are equivalent to those of AC miniature circuit breakers. The creepage distance of AC miniature circuit breakers is generally around 10mm, which cannot meet the requirements of DC voltage and operating environment, and therefore cannot ensure safety and reliability.

[0004] Patent document CN218647861U discloses a DC circuit breaker, including a circuit breaker housing. A protective cover is provided at the upper end of the circuit breaker housing to protect it. A busbar is fixedly connected to the protective cover. Power terminals are located at the upper end of the circuit breaker housing, and load terminals are located at the lower end. A switching assembly is located between the power terminals and the load terminals. An arc-extinguishing chamber is located next to the switching assembly to protect it. The power terminals are electrically connected to both the busbar and the input terminal of the switching assembly. The load terminals are electrically connected to the output terminal of the switching assembly. This design involves improvements in arc-extinguishing capability but not in insulation, which differs from the improvement direction of this utility model. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a high-insulation DC miniature circuit breaker.

[0006] The high-insulation DC miniature circuit breaker provided by this utility model includes a circuit breaker body, wherein the circuit breaker body has a circuit breaker housing including a housing body located in the middle and terminal housings located at both ends of the housing body, and a switch is installed on the front side of the housing body.

[0007] The terminal housing contains live terminals. An insulating structure is provided on the side of the terminal housing away from the main body of the housing. An insulating protective cover is installed on the terminal housing, which covers both the live terminals and the front end of the insulating structure.

[0008] Preferably, the live terminal is mounted on the side of the insulating structure facing the housing body;

[0009] The creepage path between the side-by-side live terminals is as follows: starting from one live terminal, extending along the surface of the corresponding insulating structure to the end of the insulating structure away from the main body of the housing, and then extending through the surface of the insulating structure corresponding to another live terminal to another live terminal.

[0010] Preferably, the height of the insulating structure is not less than 10.5 mm.

[0011] Preferably, the circuit breaker housing has a split structure, including a first housing and a second housing, which are spliced ​​together to form the circuit breaker housing.

[0012] Preferably, a first insulating protective cover is installed at both the upper and lower ends of the circuit breaker housing;

[0013] The width of the first insulating protective cover matches that of the terminal housing, and the edge of the first insulating protective cover is provided with a closing structure that acts on the side of the terminal housing.

[0014] Preferably, the circuit breaker body is a single-pole circuit breaker or a multi-pole circuit breaker, and the multi-pole circuit breaker includes multiple circuit breaker housings arranged in parallel.

[0015] Preferably, a first insulating protective cover is installed at the upper end of the circuit breaker housing;

[0016] The width of the first insulating protective cover matches that of the terminal housing, and the edge of the first insulating protective cover is provided with a closing structure that acts on the side of the terminal housing;

[0017] A second insulating protective cover is installed at the lower end of the circuit breaker housing, and the width of the second insulating protective cover matches the total width of the multiple circuit breaker housings arranged side by side.

[0018] The edge of the second insulating protective cover is provided with a closed structure that acts on the terminal housing side of the circuit breaker housing located at both ends of the circuit breaker housing;

[0019] The second insulating protective cover forms a through cavity with the multiple circuit breaker housings to accommodate the series lines between the multiple circuit breaker housings.

[0020] Preferably, the terminal housing is integrally formed with the insulating structure.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This invention effectively increases the creepage distance between live terminals of a DC miniature circuit breaker by increasing the height of the terminal housing, providing a larger insulation gap between phases of the DC circuit breaker, thus enhancing the product's safety performance. It also provides an insulating protective cover, further improving the insulation reliability of the DC miniature circuit breaker. Attached Figure Description

[0023] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0024] Figure 1 This is a side view of the internal structure of this utility model without the insulating protective cover installed;

[0025] Figure 2 This is a top-view schematic diagram of the internal structure of this utility model without the insulating protective cover installed;

[0026] Figure 3 A side view of the internal structure of this utility model when the insulating protective cover is installed;

[0027] Figure 4 This is a top-view schematic diagram of the internal structure of the present invention when the insulating protective cover is installed.

[0028] Figure 5 This is a structural schematic diagram of the present invention from the main view angle when the insulating protective cover is not installed;

[0029] Figure 6 This is a structural schematic diagram from the main view angle when the insulating protective cover of this utility model is installed;

[0030] Figure 7 This is a schematic diagram of the creepage path in this utility model;

[0031] Figure 8 This is a structural schematic diagram of Embodiment 1 of this utility model from the main viewing angle;

[0032] Figure 9 This is a schematic diagram of the structure of the first insulating protective cover in this utility model;

[0033] Figure 10 This is a schematic diagram of the structure of the second insulating protective cover in this utility model.

[0034] The diagram shows:

[0035] Live terminal 1 First insulating protective cover 5

[0036] Switch 2 First housing 6

[0037] Circuit breaker body 3 Second housing 7

[0038] Insulation structure 4 Second insulation protective cover 8 Detailed Implementation

[0039] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0040] This utility model discloses a high-insulation DC miniature circuit breaker. By increasing the height of the terminal housing, the creepage distance between the live terminals of the DC miniature circuit breaker can be effectively increased, providing a larger insulation gap between the phases of the DC circuit breaker, making the product's safety performance superior. In addition, an insulating protective cover is provided, further improving the insulation reliability of the DC miniature circuit breaker.

[0041] According to the present invention, a high-insulation DC miniature circuit breaker is provided, such as... Figures 1-6 As shown, the circuit breaker includes a circuit breaker body, and the circuit breaker housing 3 of the circuit breaker body includes a housing body located in the middle and terminal housings located at both ends of the housing body. A switch 2 is installed on the front side of the housing body; as shown... Figure 1 , 2 As shown in Figure 5, a live terminal 1 is installed inside the terminal housing, and an insulating structure 4 is provided on the side of the terminal housing away from the main body of the housing, such as... Figure 3 , 4 As shown in Figures 6 and 7, an insulating protective cover is installed on the terminal housing, which covers both the live terminal 1 and the front end face of the insulating structure 4. Preferably, the terminal housing and the insulating structure 4 are integrally formed.

[0042] In a preferred embodiment, the circuit breaker body is composed of a circuit breaker housing 3, with a rectangular main body in the middle and terminal housings extending from both ends. The switch 2 is secured to the front of the main body via a snap-fit ​​mechanism, and the live terminals 1 are secured inside the terminal housings via limiting grooves and connected to external wiring via screws. An outwardly protruding insulating structure 4, made of glass fiber reinforced nylon (PA66+GF30), is designed on the side of the terminal housing away from the main body. This insulating protective cover covers the front end of the live terminals 1 and the insulating structure 4 via a slot, forming a fully enclosed protection.

[0043] In this invention, the protrusions of the insulating structure 4 force the current to bypass its surface, extending the creepage path; the protective cover covers the front end of the terminal, preventing contaminants from directly adhering to the live surface. The insulating protective cover can prevent external foreign objects from contacting the live terminal, reducing the risk of short circuits, and the insulating structure 4 and the protective cover work together to form a double insulating barrier.

[0044] The live terminal 1 is installed on the side of the insulating structure 4 facing the housing body; the creepage path between the live terminals 1 arranged side by side is to start from one live terminal 1, extend along the surface of the corresponding insulating structure 4 to the end of the insulating structure 4 away from the housing body, and then extend through the surface of the insulating structure 4 corresponding to another live terminal 1 to another live terminal 1.

[0045] In a preferred example, such as Figure 7 As shown, the live terminal 1 is embedded in the insulating structure 4 on the side near the main body of the housing, forming a symmetrical layout between the two side-by-side terminals. The creepage path starts from terminal A, extends along the outer surface of its corresponding insulating structure 4 to the far end away from the housing, then turns back along the surface of another insulating structure 4 to reach terminal B, forming a "U" shape. Figure 7 The thickened path at the bottom. The protrusions in the insulation structure 4 create a physical barrier, forcing the current to take a longer surface path, avoiding straight-line breakdown. The height of the insulation structure 4 is not less than 10.5 mm. This increases the creepage distance of the DC miniature circuit breaker from 10 mm to 32 mm.

[0046] The circuit breaker housing 3 has a split structure, comprising a first housing 6 and a second housing 7, which are joined together to form the circuit breaker housing 3. In a preferred embodiment, the circuit breaker housing 3 is divided into a left half, the first housing 6, and a right half, the second housing 7, which are joined by a dovetail joint. Internally, pre-drilled clips are provided to secure the live terminals 1 and the arc-extinguishing device. This split structure simplifies mold complexity, reduces production costs, and facilitates disassembly and replacement of internal components during later maintenance.

[0047] like Figure 6 As shown, in one embodiment, a first insulating protective cover 5 is installed at both the upper and lower ends of the circuit breaker housing 3; as Figure 9 As shown, the width of the first insulating protective cover 5 matches that of the terminal housing, and the edge of the first insulating protective cover 5 is provided with a sealing structure acting on the side of the terminal housing. Preferably, the material of the first insulating protective cover 5 is the same as that of the housing, the width is the same as that of the terminal housing, and L-shaped folds are designed on both sides to fit into the grooves on the side of the terminal housing, forming a sealing interface. A heat dissipation hole is provided on the top of the protective cover, and the L-shaped folds prevent dust and moisture from entering the terminal area from the side.

[0048] like Figure 8As shown, the circuit breaker body is a single-pole circuit breaker or a multi-pole circuit breaker, and the multi-pole circuit breaker includes multiple circuit breaker housings 3 arranged in parallel. A first insulating protective cover 5 is installed on the upper end of the circuit breaker housing 3; the width of the first insulating protective cover 5 matches the terminal housing, and the edge of the first insulating protective cover 5 is provided with a closing structure acting on the side of the terminal housing; as shown... Figure 10 As shown, a second insulating protective cover 8 is installed at the lower end of the circuit breaker housing 3. The width of the second insulating protective cover 8 matches the total width of the multiple circuit breaker housings 3 arranged side by side. The edge of the second insulating protective cover 8 is provided with a closed structure that acts on the terminal housing side of the circuit breaker housings 3 located at the first and last ends of the multiple circuit breaker housings 3. A through cavity is formed between the second insulating protective cover 8 and the multiple circuit breaker housings 3 to accommodate the series circuits between the multiple circuit breaker housings 3. Preferably, the second insulating protective cover 8 covers the lower end of the multiple circuit breaker housings 3, with a width consistent with the total width, and the folded edges on both sides are snapped to the terminal housings of the first and last housings. A cavity is formed between the protective cover and the housing, and copper busbars are pre-embedded in the cavity to connect the circuits of each pole in series. The wiring is centralized through the cavity to avoid mechanical damage to the exposed circuits.

[0049] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0050] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A high-insulation DC miniature circuit breaker, characterized in that, The circuit breaker body includes a circuit breaker housing (3) which includes a housing body located in the middle and terminal housings located at both ends of the housing body. A switch (2) is installed on the front side of the housing body. The terminal housing is equipped with a live terminal (1) inside. An insulating structure (4) is provided on the side of the terminal housing away from the main body of the housing. An insulating protective cover is installed on the terminal housing. The insulating protective cover covers both the live terminal (1) and the front end of the insulating structure (4).

2. The high-insulation DC miniature circuit breaker according to claim 1, characterized in that, The live terminal (1) is installed on the side of the insulating structure (4) facing the housing body; The creepage path between the parallel live terminals (1) is as follows: starting from one live terminal (1), extending along the surface of the corresponding insulating structure (4) to the end of the insulating structure (4) away from the main body of the housing, and then extending through the surface of the insulating structure (4) corresponding to another live terminal (1) to another live terminal (1).

3. The high-insulation DC miniature circuit breaker according to claim 1, characterized in that, The height of the insulation structure (4) is not less than 10.5 mm.

4. The high-insulation DC miniature circuit breaker according to claim 1, characterized in that, The circuit breaker housing (3) is a split structure, including a first housing (6) and a second housing (7), which are spliced ​​together to form the circuit breaker housing (3).

5. The high-insulation DC miniature circuit breaker according to claim 1, characterized in that, The circuit breaker housing (3) is equipped with a first insulating protective cover (5) at both the upper and lower ends; The width of the first insulating protective cover (5) matches that of the terminal housing, and the edge of the first insulating protective cover (5) is provided with a closed structure that acts on the side of the terminal housing.

6. The high-insulation DC miniature circuit breaker according to claim 1, characterized in that, The circuit breaker body is a single-pole circuit breaker or a multi-pole circuit breaker, and the multi-pole circuit breaker includes multiple circuit breaker housings (3) arranged in parallel.

7. The high-insulation DC miniature circuit breaker according to claim 6, characterized in that, The upper end of the circuit breaker housing (3) is equipped with a first insulating protective cover (5); The width of the first insulating protective cover (5) matches that of the terminal housing, and the edge of the first insulating protective cover (5) is provided with a closed structure that acts on the side of the terminal housing; A second insulating protective cover (8) is installed at the lower end of the circuit breaker housing (3), and the width of the second insulating protective cover (8) matches the total width of the multiple circuit breaker housings (3) arranged side by side; The edge of the second insulating protective cover (8) is provided with a closed structure that acts on the terminal housing side of the circuit breaker housing (3) located at the beginning and end of the multiple circuit breaker housings (3); The second insulating protective cover (8) forms a through cavity with the multiple circuit breaker housings (3) to accommodate the series lines between the multiple circuit breaker housings (3).

8. The high-insulation DC miniature circuit breaker according to claim 1, characterized in that, The terminal housing and the insulating structure (4) are integrally formed.

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