Circuit breaker terminal block unit, circuit breaker terminal contact group and drawer-type circuit breaker

Abstract

This utility model discloses a circuit breaker terminal block unit, a circuit breaker terminal contact group, and a drawer-type circuit breaker, including a terminal housing and at least two sets of spring clips mounted on the terminal housing. An insulating terminal cover corresponding to the spring clips is installed on the terminal housing, and a concave-convex mating structure is provided between the insulating terminal cover and the terminal housing, located between two adjacent sets of spring clips, to increase the electrical clearance and creepage distance between the two sets of spring clips. This utility model, by providing a concave-convex mating structure between the two sets of spring clips on the terminal housing, changes the electrical clearance between the two sets of spring clips from a straight distance to a curved path. Without significantly increasing the structural dimensions, it can effectively improve the electrical clearance and creepage distance between the two sets of spring clips to meet UL standards.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to circuit breaker terminal block units, circuit breaker terminal contact groups, and drawer-type circuit breakers. Background Technology

[0002] Existing drawer-type circuit breakers typically only comply with IEC 60947 / GB 14048 standards, and even those that comply with UL 489 standards are often downgraded and cannot cover the high-voltage UL standards (clearance requirement 9.5mm, creepage distance requirement 12.7mm). In conventional drawer-type circuit breakers, adjacent sets of spring clips (components used to connect to the conductive plates) are separated only by the walls of two spring clip mounting slots, and due to structural size limitations, the distance between them is small, resulting in insufficient clearance and creepage distance. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a circuit breaker terminal unit, which mainly solves the technical problem of insufficient electrical clearance and creepage distance between adjacent spring clips in existing drawer-type circuit breakers.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] A circuit breaker terminal unit includes a terminal housing and at least two sets of spring clips mounted on the terminal housing. An insulating terminal cover corresponding to the spring clips is mounted on the terminal housing, and a concave-convex mating structure is provided between the insulating terminal cover and the terminal housing, located between two adjacent sets of spring clips, to increase the electrical clearance and creepage distance between the two sets of spring clips.

[0006] Furthermore, two sets of opposing spring clips are installed on the terminal housing. An isolation groove is formed on the terminal housing between the two sets of spring clips. An insulating rib extending along the length of the isolation groove is provided in the isolation groove. The insulating rib divides the isolation groove into two slots arranged opposite to each other. The insulating terminal cover includes a cover plate for covering the spring clips. The cover plate is provided with two insulating strips that are adapted to the two slots on the terminal housing. An inner groove corresponding to the insulating rib is formed between the two insulating strips. When the insulating terminal cover is installed on the terminal housing, the convex-concave mating structure formed by the two insulating strips and the two slots and the convex-concave mating structure formed by the insulating rib and the inner groove increases the electrical clearance and creepage distance between the two sets of spring clips.

[0007] Furthermore, each set of spring clips consists of two clips. When the insulating terminal cover is installed on the terminal housing, the cover plate of the insulating terminal cover covers at least two adjacent clips in the two sets of spring clips.

[0008] Furthermore, an embedding groove is provided on the terminal housing for embedding and installing an insulating terminal cover, and the cover plate of the insulating terminal cover is adapted to be embedded in the embedding groove.

[0009] Furthermore, a positioning hole is provided in the embedding groove of the terminal housing, and a positioning post adapted to the positioning hole is provided on the cover plate of the insulating terminal cover. The positioning hole and the positioning post play an auxiliary positioning role in the installation between the insulating terminal cover and the terminal housing through the positioning fit.

[0010] Furthermore, two positioning holes are provided in the mounting slot of the terminal housing, and two positioning posts are provided on the insulating terminal cover, which are respectively adapted to the two positioning holes.

[0011] Furthermore, the protrusion height of the insulating rib is at least 1 / 2 the groove depth of the inner groove, and the protrusion height of the insulating strip is adapted to the groove depth.

[0012] Furthermore, the circuit breaker terminal block unit is either a stationary terminal block structure or a moving terminal block structure of the circuit breaker.

[0013] Based on the same inventive concept, this utility model also provides a circuit breaker terminal contact group, including a terminal bracket and any of the circuit breaker wiring terminal units described above, wherein each circuit breaker wiring terminal unit is fixedly installed side by side on the terminal bracket.

[0014] Based on the same inventive concept, this utility model also provides a drawer-type circuit breaker, including any of the circuit breaker terminal units or circuit breaker terminal contact groups described above.

[0015] The above technical solution has the following advantages or beneficial effects:

[0016] In the circuit breaker terminal unit, circuit breaker terminal contact group, and drawer-type circuit breaker described in this utility model, a concave-convex mating structure is provided between two sets of spring clips on the terminal housing, so that the electrical clearance between the two sets of spring clips changes from the original straight distance to a curved path. Without significantly increasing the structural size, the electrical clearance and creepage distance between the two sets of spring clips can be effectively improved to meet UL standards. Attached Figure Description

[0017] Figure 1 This is an exploded three-dimensional structural diagram of the circuit breaker terminal unit according to an embodiment of the present invention.

[0018] Figure 2 This is a three-dimensional structural diagram of the insulating terminal cover according to an embodiment of the present utility model.

[0019] Figure 3 This is a structural cross-sectional view of the circuit breaker terminal unit according to an embodiment of the present utility model.

[0020] Figure 4 This is an exploded three-dimensional structural diagram of the circuit breaker terminal contact group according to an embodiment of the present invention.

[0021] Label Explanation:

[0022] 1. Terminal housing, 2. Clip-on component, 3. Insulating terminal cover, 4. Terminal bracket, 11. Insulating rib, 12. Groove, 13. Insertion slot, 14. Positioning hole, 31. Cover plate, 32. Insulating strip, 33. Inner groove, 34. Positioning post. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "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 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.

[0025] Please refer to the appendix. Figure 1 To be continued Figure 4 One embodiment of this utility model provides a circuit breaker terminal unit, including a terminal housing 1 and at least two sets of spring clips mounted on the terminal housing 1. An insulating terminal cover 3 corresponding to the spring clips is mounted on the terminal housing 1, and a concave-convex mating structure is provided between the insulating terminal cover 3 and the terminal housing 1, located between two adjacent sets of spring clips, to increase the electrical clearance and creepage distance between the two sets of spring clips. It is understood that in this embodiment, by providing a concave-convex mating structure between two adjacent sets of spring clips on the terminal housing 1, the electrical clearance between the two sets of spring clips changes from a straight distance to a curved path. Without significantly increasing the structural dimensions, the electrical clearance and creepage distance between the two sets of spring clips can be effectively improved to meet UL standards.

[0026] Please refer to the appendix. Figure 1 To be continued Figure 3In one preferred embodiment, two sets of opposing spring clips are preferably installed on the terminal housing 1 (however, those skilled in the art should understand that in other embodiments, the number of spring clips is not limited to the specific implementation disclosed in this embodiment, and those skilled in the art can set it according to specific needs). At the same time, an isolation groove is opened on the terminal housing 1 between the two sets of spring clips. An insulating rib 11 extending along the length of the isolation groove is provided in the isolation groove. The insulating rib 11 divides the isolation groove into two grooves 12 arranged opposite to each other. The insulating terminal cover 3 includes a cover plate 31 for covering the spring clips. The cover plate 31 is provided with two insulating strips 32 that are adapted to the two grooves 12 on the terminal housing 1 respectively. An inner groove 33 corresponding to the insulating rib 11 is formed between the two insulating strips 32. When the insulating terminal cover 3 is installed on the terminal housing 1, the electrical clearance and creepage distance between the two sets of spring clips are increased by the concave-convex fit structure formed by the two insulating strips 32 and the two grooves 12 respectively, and the concave-convex fit structure formed by the insulating rib 11 and the inner groove 33. In one preferred embodiment, the protrusion height of the insulating rib 11 is preferably at least half the groove depth of the inner groove 33, and the protrusion height of the insulating strip 32 is adapted to the groove depth of the recess 12. In this embodiment, it is preferable to configure the protrusion height of the insulating rib 11 to be half the groove depth of the inner groove 33, so as to meet the requirements of electrical clearance and creepage distance while minimizing the processing difficulty of the terminal housing 1. Because the width of the two recesses 12 is small, if the insulating rib 11 located in the middle of the two recesses 12 is too high, it will result in a large groove depth of the recess 12, which is not conducive to processing. Therefore, configuring the protrusion height of the insulating rib 11 to be half the groove depth of the inner groove 33 can meet the requirements of electrical clearance and creepage distance between the two sets of spring clips, and reduce the processing difficulty of the terminal housing 1, making processing convenient.

[0027] Please refer to the appendix. Figure 1 To be continued Figure 3 In one preferred embodiment, each set of spring clips consists of two clipping members 2. When the insulating terminal cover 3 is installed on the terminal housing 1, the cover plate 31 of the insulating terminal cover 3 covers at least two adjacent clipping members 2 in the two sets of spring clips. However, those skilled in the art should understand that in other embodiments, the size of the cover plate 31 can also be configured to cover all clipping members 2, and is not limited to the specific implementation disclosed in this embodiment.

[0028] Please refer to the appendix. Figure 1 To be continued Figure 3In one preferred embodiment, a recess 13 for mounting an insulating terminal cover 3 is provided on the terminal housing 1, and the cover plate 31 of the insulating terminal cover 3 is fitted into the recess 13. Preferably, a positioning hole 14 is provided in the recess 13 of the terminal housing 1, and a positioning post 34 adapted to the positioning hole 14 is provided on the cover plate 31 of the insulating terminal cover 3. The positioning engagement between the positioning hole 14 and the positioning post 34 provides auxiliary positioning for the installation of the insulating terminal cover 3 and the terminal housing 1. Preferably, two positioning holes 14 are provided in the recess 13 of the terminal housing 1, and two positioning posts 34 adapted to the two positioning holes 14 are provided on the insulating terminal cover 3. In this embodiment, preferably, when the cover plate 31 of the insulating terminal cover 3 is installed in the recess 13, the surfaces of the two are flush. In other embodiments, positioning holes and positioning post mating structures of other quantities and arrangements may be provided between the terminal housing 1 and the insulating terminal cover 3, and are not limited to the specific implementation methods disclosed in this embodiment.

[0029] Please refer to the appendix. Figure 1 To be continued Figure 3 In one preferred embodiment, the circuit breaker terminal unit is a static terminal structure or a dynamic terminal structure of the circuit breaker.

[0030] Please refer to the appendix. Figure 1 To be continued Figure 4 An embodiment of this utility model also provides a circuit breaker terminal contact group, including a terminal bracket 4 and any of the circuit breaker wiring terminal units described above, with each circuit breaker wiring terminal unit fixedly installed side by side on the terminal bracket 4.

[0031] Please refer to the appendix. Figure 1 To be continued Figure 4 An embodiment of this utility model also provides a drawer-type circuit breaker, including any of the circuit breaker terminal units or circuit breaker terminal contact groups described above.

[0032] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model. Therefore, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A circuit breaker terminal unit comprising a terminal housing (1) and at least two sets of spring clips mounted on the terminal housing (1), characterized in that: An insulating terminal cover (3) corresponding to the spring clip is installed on the terminal housing (1), and a concave-convex mating structure is provided between the insulating terminal cover (3) and the terminal housing (1) to increase the electrical clearance and creepage distance between the two sets of spring clips.

2. The circuit breaker terminal block unit of claim 1, wherein: Two sets of opposing spring clips are installed on the terminal housing (1). An isolation groove is provided on the terminal housing (1) between the two sets of spring clips. An insulating rib (11) extending along the length of the isolation groove is provided in the isolation groove. The insulating rib (11) divides the isolation groove into two grooves (12) arranged opposite to each other. The insulating terminal cover (3) includes a cover plate (31) for covering the spring clips. The cover plate (31) is provided with two insulating strips (32) that are adapted to the two grooves (12) on the terminal housing (1). An inner groove (33) corresponding to the insulating rib (11) is formed between the two insulating strips (32). When the insulating terminal cover (3) is installed on the terminal housing (1), the electrical clearance and creepage distance between the two sets of spring clips are increased by the concave-convex fit structure formed by the two insulating strips (32) and the two grooves (12) respectively, and the concave-convex fit structure formed by the insulating rib (11) and the inner groove (33).

3. The circuit breaker terminal block unit of claim 2, wherein: Each set of spring clips consists of two clips (2). When the insulating terminal cover (3) is installed on the terminal housing (1), the cover plate (31) of the insulating terminal cover (3) covers at least two adjacent clips (2) in the two sets of spring clips.

4. The circuit breaker terminal block unit according to claim 2, characterized in that: An embedding slot (13) for embedding and installing an insulating terminal cover (3) is provided on the terminal housing (1), and the cover plate (31) of the insulating terminal cover (3) is adapted to be embedded in the embedding slot (13).

5. The circuit breaker terminal block unit of claim 4, wherein: A positioning hole (14) is provided in the mounting slot (13) of the terminal housing (1). A positioning post (34) that matches the positioning hole (14) is provided on the cover plate (31) of the insulating terminal cover (3). The positioning hole (14) and the positioning post (34) play an auxiliary positioning role in the installation between the insulating terminal cover (3) and the terminal housing (1).

6. The circuit breaker terminal unit of claim 5, wherein: Two positioning holes (14) are provided in the mounting slot (13) of the terminal housing (1), and two positioning pins (34) are provided on the insulating terminal cover (3) respectively, which are adapted to the two positioning holes (14).

7. The circuit breaker terminal unit of any of claims 2 to 6, wherein: The protrusion height of the insulating rib (11) is at least 1 / 2 the groove depth of the inner groove (33), and the protrusion height of the insulating strip (32) is adapted to the groove depth of the groove (12).

8. The circuit breaker terminal unit of any one of claims 1 to 6, characterized in that: The circuit breaker terminal block unit is either a stationary terminal block structure or a moving terminal block structure of the circuit breaker.

9. A circuit breaker terminal contact assembly characterized by: It includes a terminal bracket (4) and several circuit breaker terminal units as described in any one of claims 1 to 8, wherein each circuit breaker terminal unit is fixedly mounted side by side on the terminal bracket (4).

10. A draw-out circuit breaker characterized by: It includes the circuit breaker terminal block unit as described in any one of claims 1 to 8 or the circuit breaker terminal contact group as described in claim 9.

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