A molded case circuit breaker

Abstract

The utility model relates to a moulded case circuit breaker belongs to low pressure circuit breaker technical field. Including base, tripping device and upper cover, the upper cover with base cooperation installation, form the cavity for accommodating tripping device, still include insulating part, the insulating part set up in the cavity, located tripping device one side and located the assembly gap of upper cover and base assembly formation, separate tripping device with assembly gap. Advantage: can effectively improve the interphase insulation of circuit breaker and the ground insulation performance, thereby reduce tripping device from the electrical interference of adjacent phase and the electrical influence to ground, and can reduce its risk of contamination by free gas to a certain extent, thereby the reliability and safety of circuit breaker in circuit protection are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of low-voltage circuit breaker, and relates to a molded case circuit breaker. BACKGROUND

[0002] The molded case circuit breaker generally comprises a moving contact, a static contact, an operating mechanism and a release. The release applied in the molded case circuit breaker plays a relatively important role in the realization of the function of the circuit breaker. When the line has an abnormality such as short circuit or overload, the release acts to unlock the operating mechanism, so that the circuit breaker completes the whole protection process. However, the structure of the release in the existing molded case circuit breaker is easily affected by the electrical influence between adjacent phases and to the ground, and is also easily polluted by the ionized gas, so that the circuit breaker cannot provide absolute reliability and safety in circuit protection.

[0003] In view of the above prior art, the present applicant has made beneficial design, and the technical scheme to be introduced below is generated in this background. SUMMARY

[0004] The present application aims to provide a molded case circuit breaker, which can effectively improve the insulation performance between phases and to the ground of the circuit breaker, so as to reduce the electrical interference from adjacent phases and the electrical influence to the ground on the release, and reduce the risk of pollution of the release by ionized gas.

[0005] The purpose of the present application is achieved by a molded case circuit breaker, which comprises a base, a release and an upper cover. The upper cover is installed in cooperation with the base to form a cavity for accommodating the release. The molded case circuit breaker further comprises an insulation member, which is arranged in the cavity, located at one side of the release and at an assembly gap formed by the cooperation of the upper cover and the base, and separates the release from the assembly gap.

[0006] In one specific embodiment of the present application, after the upper cover and the base are assembled in place, an assembly gap is formed between the phase spacing rib of the base and the upper cover spacing rib of the upper cover. The insulation member located at the side of the release close to the phase spacing rib is arranged at the assembly gap, and the upper edge of the insulation member is higher than the assembly gap, and the lower edge of the insulation member is lower than the assembly gap.

[0007] In another specific embodiment of the present application, after the upper cover and the base are assembled in place, an assembly gap is formed between the base side plate of the base and the upper cover side plate of the upper cover. The insulation member located at the side of the release close to the base side plate is arranged at the assembly gap, and the upper edge of the insulation member is higher than the assembly gap, and the lower edge of the insulation member is lower than the assembly gap.

[0008] In still another specific embodiment of the present application, the side edges of the insulation member on both sides have bending structures extending in the height direction, and the bending structures are bent towards the side close to the release.

[0009] In still another specific embodiment of the present application, the insulation component is clamped between the trip unit and the phase spacing rib, and after the upper cover and the base are assembled in place, the bottom of the insulation component is located in the installation plane of the trip unit, and the top is located on the upper cover top surface of the upper cover.

[0010] In still another specific embodiment of the present application, the insulation component is clamped between the trip unit and the base side plate, and after the upper cover and the base are assembled in place, the bottom of the insulation component is located in the installation plane of the trip unit, and the top is located on the upper cover top surface of the upper cover.

[0011] In still another specific embodiment of the present application, the insulation component is clamped between the trip unit and the base side plate, and after the upper cover and the base are assembled in place, the bottom of the insulation component is located in the installation plane of the trip unit, and the top is located on the upper cover top surface of the upper cover.

[0012] In still another specific embodiment of the present application, the insulation component is clamped between the trip unit and the base side plate, and after the upper cover and the base are assembled in place, the bottom of the insulation component is located in the installation plane of the trip unit, and the top is located on the upper cover top surface of the upper cover.

[0013] In still another specific embodiment of the present application, the insulation component is clamped between the trip unit and the base side plate, and after the upper cover and the base are assembled in place, the bottom of the insulation component is located in the installation plane of the trip unit, and the top is located on the upper cover top surface of the upper cover.

[0014] In still another specific embodiment of the present application, the insulation component is clamped between the trip unit and the base side plate, and after the upper cover and the base are assembled in place, the bottom of the insulation component is located in the installation plane of the trip unit, and the top is located on the upper cover top surface of the upper cover.

[0015] The present application has the beneficial effects of effectively protecting the trip unit, improving the phase-to-phase insulation and ground insulation performance of the circuit breaker, reducing the electrical influence of the trip unit from adjacent phases or ground, and to a certain extent, reducing the risk of contamination by ionized gas, thereby improving the reliability and safety of the circuit breaker in circuit protection. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The overall structure of the application.

[0017] Figure 2 The assembly of the upper cover and the base according to the application.

[0018] Figure 3 The internal structure of the upper cover according to the application.

[0019] Figure 4 The structure of the insulation component according to the application.

[0020] Figure 5 The structure of the release according to the application.

[0021] Figure 6 The top view of Figure 1

[0022] In the figure: 1. Base, 11. Cavity, 12. Boss, 13. Spacing rib, 14. Base side plate; 2. Release, 21. Conductor, 22. Bimetallic strip, 23. Bracket, 24. Armature, 25. Spring; 3. Insulation component, 31. First insulation sheet, 311. First bending structure, 32. Second insulation sheet, 321. Second bending structure, 33. Insulation connecting plate, 34. Hollow cavity, 4. Towing rod; 5. Upper cover, 51. Upper cover spacing rib, 52. Upper cover side plate, 53. Upper cover top surface. DETAILED DESCRIPTION

[0023] The specific embodiments of the application are described in detail below with reference to the accompanying drawings, but the description of the embodiments is not a limitation of the technical solutions, and any formal but not substantial changes according to the concept of the application should be considered as the protection scope of the application.

[0024] Please refer to Figures 1 to 3 ​The application relates to a molded case circuit breaker, comprising a base 1, an upper cover 5, an operating mechanism, a contact device (not shown in the figure) and a release 2 arranged in the base 1 and the upper cover 5, the contact device is used for breaking and connecting a line current, the operating mechanism is used for driving the contact device to act, and the release 2 is used for monitoring the line current and acting to drive the operating mechanism when the line current is abnormal. The upper cover side plate 52 of the upper cover 5 and the upper cover partition rib 51 are respectively matched with the base side plate 14 of the base 1 and the phase-to-phase partition rib 13 to form a cavity 11 used for accommodating the release 2. The circuit breaker further comprises an insulation part 3, the insulation part 3 is arranged in the cavity 11, located at one side of the release 2 close to the base side plate 14 and / or one side close to the adjacent phase-to-phase partition rib 13, and located at an assembly gap formed by the assembly of the upper cover 5 and the base 1. That is, the insulation part 3 can be arranged only at the side close to the base side plate 14 or only at the side close to the phase-to-phase partition rib 13, and in the embodiment, the insulation part 3 is arranged at the side close to the base side plate 14 and the side close to the adjacent phase-to-phase partition rib 13.

[0025] The molded case circuit breaker in the embodiment is a two-pole circuit breaker, has two cavities 11, and one release 2 is arranged in each cavity 11. The release 2 in the embodiment is a magnetic release, and of course, in another embodiment, it can be a thermal release or a thermal-magnetic release.

[0026] Specifically, after the upper cover 5 and the base 1 are assembled, an assembly gap is formed between the phase-to-phase partition rib 13 in the base 1 and the upper cover partition rib 51, the insulation part 3 located at the side of the release 2 close to the phase-to-phase partition rib 13 is arranged at the assembly gap, and the upper edge of the insulation part 3 is higher than the assembly gap and the lower edge is lower than the assembly gap; in addition, an assembly gap is formed between the base side plate 14 of the base 1 and the upper cover side plate 52, the insulation part 3 located at the side of the release 2 close to the base side plate 14 of the base 1 is arranged at the assembly gap, and the upper edge of the insulation part 3 is higher than the assembly gap and the lower edge is lower than the assembly gap.

[0027] Please refer to Figure 4 , in combination with Figure 1 and Figure 2The insulation component 3 comprises a first insulation sheet 31 and a second insulation sheet 32. In this embodiment, the second insulation sheet 32 is located on the side of the release 2 close to the base side plate 14 of the base 1, and the first insulation sheet 31 is located on the side close to the phase spacing rib 13. After the upper cover 5 and the base 1 are assembled in place, the bottom of the first insulation sheet 31 and the second insulation sheet 32 is located on the installation plane of the release 2, and the top is located on the upper cover top surface 53 of the upper cover 5, thereby increasing the protection range of the first insulation sheet 31 and the second insulation sheet 32, and at the same time, the first insulation sheet 31 and the second insulation sheet 32 are pressed between the installation plane of the release 2 and the upper cover top surface 53, thereby enhancing the installation reliability. The first insulation sheet 31 has a first bending structure 311 extending in the height direction on the side edges of both sides, and the second insulation sheet 32 has a second bending structure 312 extending in the height direction on the side edges of both sides. The first bending structure 311 and the second bending structure 312 are bent towards the side close to the release 2, respectively. The first insulation sheet 31 and the second insulation sheet 32 can effectively protect the release, effectively improve the phase-to-phase insulation and ground insulation performance of the circuit breaker, reduce the electrical influence of the release from the adjacent phase or ground, and to a certain extent, reduce the risk of being contaminated by ionized gas, thereby improving the reliability and safety of the circuit breaker in circuit protection. The first insulation sheet 31 and the second insulation sheet 32 can be sheet-shaped insulation members made of nylon or DMC insulation materials.

[0028] Further, referring to Figure 5 and Figure 6 in combination with Figure 4 , the base 1 is provided with a boss 12 in the cavity 11, and the release 2 comprises a conductor 21, a bimetallic strip 22, a bracket 23, an armature 24 and a spring 25. The conductor 21 is supported on the bracket 23, the bimetallic strip 22 is connected to the conductor 21, one end of the spring 25 is connected to the bracket 23, and the other end is connected to the upper end of the armature 24. The armature 24 is limited on the boss 12 by the action of the spring 25 in the installation position. The base 1 is further provided with a traction rod 4 in the cavity 11, and the first insulation sheet 31 and the second insulation sheet 32 are provided with an insulation connecting plate 33 on the side close to the traction rod. In this embodiment, the insulation connecting plate 33 is arranged in the middle of the first insulation sheet 31 and the second insulation sheet 32, and the space between the first insulation sheet 31 and the second insulation sheet 32 is located on the upper and lower parts of the insulation connecting plate 33, forming a hollow cavity 34 that does not hinder the movement of the armature 24. The arrangement of the insulation connecting plate 33 can enhance the overall strength of the insulation component 3, and can block part of the reverse gas from the rear of the arc extinguishing chamber, preventing the device from being corroded.

[0029] In the present embodiment, the first insulating sheet 31 is integrally provided with the second insulating sheet 32 and the insulating connecting plate 33.

[0030] In addition, in other embodiments, the insulating member 3 can be insulating tape attached at the assembly gap formed by the assembly of the upper cover 5 and the base 1, and can also play a role in improving the inter-phase insulation and the insulation to ground.

Claims

1. A molded case circuit breaker, comprising a base (1), a trip unit (2), and a top cover (5), wherein the top cover (5) is fitted and installed with the base (1) to form a cavity (11) for accommodating the trip unit (2), characterized in that: It also includes an insulating component (3), which is disposed in the cavity (11), located on one side of the trip unit (2) and at the assembly gap formed by the assembly of the upper cover (5) and the base (1), separating the trip unit (2) from the assembly gap; after the upper cover (5) and the base (1) are assembled, an assembly gap is formed between the adjacent phase spacing ribs (13) of the base (1) and the upper cover ribs (51) of the upper cover (5), and the insulating component (3) located on the side of the trip unit (2) near the phase spacing ribs (13) is disposed at the assembly gap, and the upper edge of the insulating component (3) is higher than the assembly gap and the lower edge is lower than the assembly gap.

2. A molded case circuit breaker according to claim 1, characterized in that... After the upper cover (5) and the base (1) are assembled, an assembly gap is formed between the base side plate (14) of the base (1) and the upper cover side plate (52) of the upper cover (5). The insulating component (3) located on the side of the trip unit (2) near the base side plate (14) is set at the assembly gap, and the upper edge of the insulating component (3) is higher than the assembly gap and the lower edge is lower than the assembly gap.

3. A molded case circuit breaker according to any one of claims 1 to 2, characterized in that... The insulating component (3) has a bending structure extending along the height direction on both sides of its sides, and the bending structure bends toward the side closer to the trip unit (2).

4. A molded case circuit breaker according to claim 1, characterized in that... The insulating component (3) is fitted between the trip unit (2) and the phase spacing rib (13). After the upper cover (5) and the base (1) are assembled in place, the bottom of the insulating component (3) is located on the mounting plane of the trip unit (2), and the top is located on the top surface (53) of the upper cover (5).

5. A molded case circuit breaker according to claim 2, characterized in that... The insulating component (3) is fitted between the trip unit (2) and the base side plate (14). After the upper cover (5) and the base (1) are assembled, the bottom of the insulating component (3) is located on the mounting plane of the trip unit (2), and the top is located on the top surface (53) of the upper cover (5).

6. A molded case circuit breaker according to claim 3, characterized in that... The insulating component (3) includes a first insulating sheet (31) and a second insulating sheet (32). The first insulating sheet (31) is located on one side of the phase spacing rib (13) between adjacent phases of the trip unit (2) near the base (1). The second insulating sheet (32) is located on one side of the trip unit (2) near the base side plate (14) of the base (1). The first insulating sheet (31) has a first bending structure (311) extending in the height direction on both sides. The second insulating sheet (32) has a second bending structure (312) extending in the height direction on both sides. The first bending structure (311) and the second bending structure (312) are bent toward the side near the trip unit (2), respectively.

7. A molded case circuit breaker according to claim 6, characterized in that... The base (1) is provided with a traction rod (4) in the cavity (11), and the first insulating sheet (31) and the second insulating sheet (32) are provided with an insulating connecting plate (33) connecting the first insulating sheet (31) and the second insulating sheet (32) on the side near the traction rod (4).

8. A molded case circuit breaker according to claim 7, characterized in that... The base (1) is provided with a boss (12) in the cavity (11). The trip device (2) includes a conductor (21), a bimetallic strip (22), a bracket (23), an armature (24), and a spring (25). The conductor (21) is supported on the bracket (23). The bimetallic strip (22) is connected to the conductor (21). One end of the spring (25) is connected to the bracket (23), and the other end is connected to the upper end of the armature (24). The armature (24) is limited to the boss (12) in the installation position by the action of the spring (25). The insulating connecting plate (33) is provided in the middle of the first insulating sheet (31) and the second insulating sheet (32). The space between the first insulating sheet (31) and the second insulating sheet (32) located in the upper and lower parts of the insulating connecting plate (33) forms a hollow cavity (34) that does not hinder the movement of the armature (24).

9. A molded case circuit breaker according to claim 1, characterized in that... The insulating component (3) is insulating tape, which is attached to the assembly gap formed by the assembly of the upper cover (5) and the base (1).

Images